SDL_render.c File Reference

#include "../SDL_internal.h"
#include "SDL_assert.h"
#include "SDL_hints.h"
#include "SDL_log.h"
#include "SDL_render.h"
#include "SDL_sysrender.h"
#include "software/SDL_render_sw_c.h"

Include dependency graph for SDL_render.c:

Go to the source code of this file.

Macros
#define	SDL_WINDOWRENDERDATA   "_SDL_WindowRenderData"
#define	CHECK_RENDERER_MAGIC(renderer, retval)
#define	CHECK_TEXTURE_MAGIC(texture, retval)
#define	SDL_COMPOSE_BLENDMODE(srcColorFactor, dstColorFactor, colorOperation, srcAlphaFactor, dstAlphaFactor, alphaOperation)
#define	SDL_BLENDMODE_NONE_FULL
#define	SDL_BLENDMODE_BLEND_FULL
#define	SDL_BLENDMODE_ADD_FULL
#define	SDL_BLENDMODE_MOD_FULL

Functions
static int	UpdateLogicalSize (SDL_Renderer *renderer)
int	SDL_GetNumRenderDrivers (void)
	Get the number of 2D rendering drivers available for the current display.
int	SDL_GetRenderDriverInfo (int index, SDL_RendererInfo *info)
	Get information about a specific 2D rendering driver for the current display.
static void	GetWindowViewportValues (SDL_Renderer *renderer, int *logical_w, int *logical_h, SDL_Rect *viewport, SDL_FPoint *scale)
static int	SDL_RendererEventWatch (void *userdata, SDL_Event *event)
int	SDL_CreateWindowAndRenderer (int width, int height, Uint32 window_flags, SDL_Window **window, SDL_Renderer **renderer)
	Create a window and default renderer.
SDL_Renderer *	SDL_CreateRenderer (SDL_Window *window, int index, Uint32 flags)
	Create a 2D rendering context for a window.
SDL_Renderer *	SDL_CreateSoftwareRenderer (SDL_Surface *surface)
	Create a 2D software rendering context for a surface.
SDL_Renderer *	SDL_GetRenderer (SDL_Window *window)
	Get the renderer associated with a window.
int	SDL_GetRendererInfo (SDL_Renderer *renderer, SDL_RendererInfo *info)
	Get information about a rendering context.
int	SDL_GetRendererOutputSize (SDL_Renderer *renderer, int *w, int *h)
	Get the output size in pixels of a rendering context.
static SDL_bool	IsSupportedBlendMode (SDL_Renderer *renderer, SDL_BlendMode blendMode)
static SDL_bool	IsSupportedFormat (SDL_Renderer *renderer, Uint32 format)
static Uint32	GetClosestSupportedFormat (SDL_Renderer *renderer, Uint32 format)
static SDL_ScaleMode	SDL_GetScaleMode (void)
SDL_Texture *	SDL_CreateTexture (SDL_Renderer *renderer, Uint32 format, int access, int w, int h)
	Create a texture for a rendering context.
SDL_Texture *	SDL_CreateTextureFromSurface (SDL_Renderer *renderer, SDL_Surface *surface)
	Create a texture from an existing surface.
int	SDL_QueryTexture (SDL_Texture *texture, Uint32 *format, int *access, int *w, int *h)
	Query the attributes of a texture.
int	SDL_SetTextureColorMod (SDL_Texture *texture, Uint8 r, Uint8 g, Uint8 b)
	Set an additional color value used in render copy operations.
int	SDL_GetTextureColorMod (SDL_Texture *texture, Uint8 *r, Uint8 *g, Uint8 *b)
	Get the additional color value used in render copy operations.
int	SDL_SetTextureAlphaMod (SDL_Texture *texture, Uint8 alpha)
	Set an additional alpha value used in render copy operations.
int	SDL_GetTextureAlphaMod (SDL_Texture *texture, Uint8 *alpha)
	Get the additional alpha value used in render copy operations.
int	SDL_SetTextureBlendMode (SDL_Texture *texture, SDL_BlendMode blendMode)
	Set the blend mode used for texture copy operations.
int	SDL_GetTextureBlendMode (SDL_Texture *texture, SDL_BlendMode *blendMode)
	Get the blend mode used for texture copy operations.
static int	SDL_UpdateTextureYUV (SDL_Texture *texture, const SDL_Rect *rect, const void *pixels, int pitch)
static int	SDL_UpdateTextureNative (SDL_Texture *texture, const SDL_Rect *rect, const void *pixels, int pitch)
int	SDL_UpdateTexture (SDL_Texture *texture, const SDL_Rect *rect, const void *pixels, int pitch)
	Update the given texture rectangle with new pixel data.
static int	SDL_UpdateTextureYUVPlanar (SDL_Texture *texture, const SDL_Rect *rect, const Uint8 *Yplane, int Ypitch, const Uint8 *Uplane, int Upitch, const Uint8 *Vplane, int Vpitch)
int	SDL_UpdateYUVTexture (SDL_Texture *texture, const SDL_Rect *rect, const Uint8 *Yplane, int Ypitch, const Uint8 *Uplane, int Upitch, const Uint8 *Vplane, int Vpitch)
	Update a rectangle within a planar YV12 or IYUV texture with new pixel data.
static int	SDL_LockTextureYUV (SDL_Texture *texture, const SDL_Rect *rect, void **pixels, int *pitch)
static int	SDL_LockTextureNative (SDL_Texture *texture, const SDL_Rect *rect, void **pixels, int *pitch)
int	SDL_LockTexture (SDL_Texture *texture, const SDL_Rect *rect, void **pixels, int *pitch)
	Lock a portion of the texture for write-only pixel access.
static void	SDL_UnlockTextureYUV (SDL_Texture *texture)
static void	SDL_UnlockTextureNative (SDL_Texture *texture)
void	SDL_UnlockTexture (SDL_Texture *texture)
	Unlock a texture, uploading the changes to video memory, if needed.
SDL_bool	SDL_RenderTargetSupported (SDL_Renderer *renderer)
	Determines whether a window supports the use of render targets.
int	SDL_SetRenderTarget (SDL_Renderer *renderer, SDL_Texture *texture)
	Set a texture as the current rendering target.
SDL_Texture *	SDL_GetRenderTarget (SDL_Renderer *renderer)
	Get the current render target or NULL for the default render target.
int	SDL_RenderSetLogicalSize (SDL_Renderer *renderer, int w, int h)
	Set device independent resolution for rendering.
void	SDL_RenderGetLogicalSize (SDL_Renderer *renderer, int *w, int *h)
	Get device independent resolution for rendering.
int	SDL_RenderSetIntegerScale (SDL_Renderer *renderer, SDL_bool enable)
	Set whether to force integer scales for resolution-independent rendering.
SDL_bool	SDL_RenderGetIntegerScale (SDL_Renderer *renderer)
	Get whether integer scales are forced for resolution-independent rendering.
int	SDL_RenderSetViewport (SDL_Renderer *renderer, const SDL_Rect *rect)
	Set the drawing area for rendering on the current target.
void	SDL_RenderGetViewport (SDL_Renderer *renderer, SDL_Rect *rect)
	Get the drawing area for the current target.
int	SDL_RenderSetClipRect (SDL_Renderer *renderer, const SDL_Rect *rect)
	Set the clip rectangle for the current target.
void	SDL_RenderGetClipRect (SDL_Renderer *renderer, SDL_Rect *rect)
	Get the clip rectangle for the current target.
SDL_bool	SDL_RenderIsClipEnabled (SDL_Renderer *renderer)
	Get whether clipping is enabled on the given renderer.
int	SDL_RenderSetScale (SDL_Renderer *renderer, float scaleX, float scaleY)
	Set the drawing scale for rendering on the current target.
void	SDL_RenderGetScale (SDL_Renderer *renderer, float *scaleX, float *scaleY)
	Get the drawing scale for the current target.
int	SDL_SetRenderDrawColor (SDL_Renderer *renderer, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
	Set the color used for drawing operations (Rect, Line and Clear).
int	SDL_GetRenderDrawColor (SDL_Renderer *renderer, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
	Get the color used for drawing operations (Rect, Line and Clear).
int	SDL_SetRenderDrawBlendMode (SDL_Renderer *renderer, SDL_BlendMode blendMode)
	Set the blend mode used for drawing operations (Fill and Line).
int	SDL_GetRenderDrawBlendMode (SDL_Renderer *renderer, SDL_BlendMode *blendMode)
	Get the blend mode used for drawing operations.
int	SDL_RenderClear (SDL_Renderer *renderer)
	Clear the current rendering target with the drawing color.
int	SDL_RenderDrawPoint (SDL_Renderer *renderer, int x, int y)
	Draw a point on the current rendering target.
static int	RenderDrawPointsWithRects (SDL_Renderer *renderer, const SDL_Point *points, int count)
int	SDL_RenderDrawPoints (SDL_Renderer *renderer, const SDL_Point *points, int count)
	Draw multiple points on the current rendering target.
int	SDL_RenderDrawLine (SDL_Renderer *renderer, int x1, int y1, int x2, int y2)
	Draw a line on the current rendering target.
static int	RenderDrawLinesWithRects (SDL_Renderer *renderer, const SDL_Point *points, int count)
int	SDL_RenderDrawLines (SDL_Renderer *renderer, const SDL_Point *points, int count)
	Draw a series of connected lines on the current rendering target.
int	SDL_RenderDrawRect (SDL_Renderer *renderer, const SDL_Rect *rect)
	Draw a rectangle on the current rendering target.
int	SDL_RenderDrawRects (SDL_Renderer *renderer, const SDL_Rect *rects, int count)
	Draw some number of rectangles on the current rendering target.
int	SDL_RenderFillRect (SDL_Renderer *renderer, const SDL_Rect *rect)
	Fill a rectangle on the current rendering target with the drawing color.
int	SDL_RenderFillRects (SDL_Renderer *renderer, const SDL_Rect *rects, int count)
	Fill some number of rectangles on the current rendering target with the drawing color.
int	SDL_RenderCopy (SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *srcrect, const SDL_Rect *dstrect)
	Copy a portion of the texture to the current rendering target.
int	SDL_RenderCopyEx (SDL_Renderer *renderer, SDL_Texture *texture, const SDL_Rect *srcrect, const SDL_Rect *dstrect, const double angle, const SDL_Point *center, const SDL_RendererFlip flip)
	Copy a portion of the source texture to the current rendering target, rotating it by angle around the given center.
int	SDL_RenderReadPixels (SDL_Renderer *renderer, const SDL_Rect *rect, Uint32 format, void *pixels, int pitch)
	Read pixels from the current rendering target.
void	SDL_RenderPresent (SDL_Renderer *renderer)
	Update the screen with rendering performed.
void	SDL_DestroyTexture (SDL_Texture *texture)
	Destroy the specified texture.
void	SDL_DestroyRenderer (SDL_Renderer *renderer)
	Destroy the rendering context for a window and free associated textures.
int	SDL_GL_BindTexture (SDL_Texture *texture, float *texw, float *texh)
	Bind the texture to the current OpenGL/ES/ES2 context for use with OpenGL instructions.
int	SDL_GL_UnbindTexture (SDL_Texture *texture)
	Unbind a texture from the current OpenGL/ES/ES2 context.
void *	SDL_RenderGetMetalLayer (SDL_Renderer *renderer)
	Get the CAMetalLayer associated with the given Metal renderer.
void *	SDL_RenderGetMetalCommandEncoder (SDL_Renderer *renderer)
	Get the Metal command encoder for the current frame.
static SDL_BlendMode	SDL_GetShortBlendMode (SDL_BlendMode blendMode)
static SDL_BlendMode	SDL_GetLongBlendMode (SDL_BlendMode blendMode)
SDL_BlendMode	SDL_ComposeCustomBlendMode (SDL_BlendFactor srcColorFactor, SDL_BlendFactor dstColorFactor, SDL_BlendOperation colorOperation, SDL_BlendFactor srcAlphaFactor, SDL_BlendFactor dstAlphaFactor, SDL_BlendOperation alphaOperation)
	Create a custom blend mode, which may or may not be supported by a given renderer.
SDL_BlendFactor	SDL_GetBlendModeSrcColorFactor (SDL_BlendMode blendMode)
SDL_BlendFactor	SDL_GetBlendModeDstColorFactor (SDL_BlendMode blendMode)
SDL_BlendOperation	SDL_GetBlendModeColorOperation (SDL_BlendMode blendMode)
SDL_BlendFactor	SDL_GetBlendModeSrcAlphaFactor (SDL_BlendMode blendMode)
SDL_BlendFactor	SDL_GetBlendModeDstAlphaFactor (SDL_BlendMode blendMode)
SDL_BlendOperation	SDL_GetBlendModeAlphaOperation (SDL_BlendMode blendMode)

Variables
static const SDL_RenderDriver *	render_drivers []
static char	renderer_magic
static char	texture_magic

Macro Definition Documentation

#define CHECK_RENDERER_MAGIC	(		renderer,
			retval
	)

Value:

SDL_assert(renderer && renderer->magic == &renderer_magic); \
    if (!renderer || renderer->magic != &renderer_magic) { \
        SDL_SetError("Invalid renderer"); \
        return retval; \
    }

Definition at line 35 of file SDL_render.c.

Referenced by SDL_CreateTexture(), SDL_CreateTextureFromSurface(), SDL_DestroyRenderer(), SDL_GetRenderDrawBlendMode(), SDL_GetRenderDrawColor(), SDL_GetRendererInfo(), SDL_GetRendererOutputSize(), SDL_RenderClear(), SDL_RenderCopy(), SDL_RenderCopyEx(), SDL_RenderDrawLines(), SDL_RenderDrawPoints(), SDL_RenderDrawRect(), SDL_RenderDrawRects(), SDL_RenderFillRect(), SDL_RenderFillRects(), SDL_RenderGetClipRect(), SDL_RenderGetIntegerScale(), SDL_RenderGetLogicalSize(), SDL_RenderGetMetalCommandEncoder(), SDL_RenderGetMetalLayer(), SDL_RenderGetScale(), SDL_RenderGetViewport(), SDL_RenderIsClipEnabled(), SDL_RenderPresent(), SDL_RenderReadPixels(), SDL_RenderSetClipRect(), SDL_RenderSetIntegerScale(), SDL_RenderSetLogicalSize(), SDL_RenderSetScale(), SDL_RenderSetViewport(), SDL_SetRenderDrawBlendMode(), and SDL_SetRenderDrawColor().

#define CHECK_TEXTURE_MAGIC	(		texture,
			retval
	)

Value:

SDL_assert(texture && texture->magic == &texture_magic); \
    if (!texture || texture->magic != &texture_magic) { \
        SDL_SetError("Invalid texture"); \
        return retval; \
    }

Definition at line 42 of file SDL_render.c.

Referenced by SDL_DestroyTexture(), SDL_GetTextureAlphaMod(), SDL_GetTextureBlendMode(), SDL_GetTextureColorMod(), SDL_GL_BindTexture(), SDL_GL_UnbindTexture(), SDL_LockTexture(), SDL_QueryTexture(), SDL_RenderCopy(), SDL_RenderCopyEx(), SDL_SetRenderTarget(), SDL_SetTextureAlphaMod(), SDL_SetTextureBlendMode(), SDL_SetTextureColorMod(), SDL_UnlockTexture(), SDL_UpdateTexture(), and SDL_UpdateYUVTexture().

#define SDL_BLENDMODE_ADD_FULL

Value:

SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)

Definition at line 67 of file SDL_render.c.

Referenced by SDL_GetLongBlendMode(), and SDL_GetShortBlendMode().

#define SDL_BLENDMODE_BLEND_FULL

Value:

SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD)

Definition at line 63 of file SDL_render.c.

Referenced by SDL_GetLongBlendMode(), and SDL_GetShortBlendMode().

#define SDL_BLENDMODE_MOD_FULL

Value:

SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_COLOR, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)

Definition at line 71 of file SDL_render.c.

Referenced by SDL_GetLongBlendMode(), and SDL_GetShortBlendMode().

#define SDL_BLENDMODE_NONE_FULL

Value:

SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD)

Definition at line 59 of file SDL_render.c.

Referenced by SDL_GetLongBlendMode(), and SDL_GetShortBlendMode().

#define SDL_COMPOSE_BLENDMODE	(		srcColorFactor,
			dstColorFactor,
			colorOperation,
			srcAlphaFactor,
			dstAlphaFactor,
			alphaOperation
	)

Value:

(SDL_BlendMode)(((Uint32)colorOperation << 0) | \
                    ((Uint32)srcColorFactor << 4) | \
                    ((Uint32)dstColorFactor << 8) | \
                    ((Uint32)alphaOperation << 16) | \
                    ((Uint32)srcAlphaFactor << 20) | \
                    ((Uint32)dstAlphaFactor << 24))

Definition at line 50 of file SDL_render.c.

Referenced by SDL_ComposeCustomBlendMode().

#define SDL_WINDOWRENDERDATA   "_SDL_WindowRenderData"

Definition at line 33 of file SDL_render.c.

Referenced by SDL_CreateRenderer(), SDL_DestroyRenderer(), and SDL_GetRenderer().

Function Documentation

static Uint32 GetClosestSupportedFormat ( SDL_Renderer *  renderer, Uint32  format  )

static

Definition at line 499 of file SDL_render.c.

References i, SDL_Renderer::info, SDL_RendererInfo::num_texture_formats, SDL_ISPIXELFORMAT_ALPHA, SDL_ISPIXELFORMAT_FOURCC, and SDL_RendererInfo::texture_formats.

Referenced by SDL_CreateTexture().

{
    Uint32 i;

    if (SDL_ISPIXELFORMAT_FOURCC(format)) {
        /* Look for an exact match */
        for (i = 0; i < renderer->info.num_texture_formats; ++i) {
            if (renderer->info.texture_formats[i] == format) {
                return renderer->info.texture_formats[i];
            }
        }
    } else {
        SDL_bool hasAlpha = SDL_ISPIXELFORMAT_ALPHA(format);

        /* We just want to match the first format that has the same channels */
        for (i = 0; i < renderer->info.num_texture_formats; ++i) {
            if (!SDL_ISPIXELFORMAT_FOURCC(renderer->info.texture_formats[i]) &&
                SDL_ISPIXELFORMAT_ALPHA(renderer->info.texture_formats[i]) == hasAlpha) {
                return renderer->info.texture_formats[i];
            }
        }
    }
    return renderer->info.texture_formats[0];
}

static void GetWindowViewportValues ( SDL_Renderer *  renderer, int *  logical_w, int *  logical_h, SDL_Rect *  viewport, SDL_FPoint *  scale  )

static

Definition at line 135 of file SDL_render.c.

References SDL_Renderer::logical_h, SDL_Renderer::logical_h_backup, SDL_Renderer::logical_w, SDL_Renderer::logical_w_backup, SDL_Renderer::scale, SDL_Renderer::scale_backup, SDL_LockMutex, SDL_UnlockMutex, SDL_Renderer::target, SDL_Renderer::target_mutex, SDL_Renderer::viewport, and SDL_Renderer::viewport_backup.

Referenced by SDL_RendererEventWatch().

{
    SDL_LockMutex(renderer->target_mutex);
    *logical_w = renderer->target ? renderer->logical_w_backup : renderer->logical_w;
    *logical_h = renderer->target ? renderer->logical_h_backup : renderer->logical_h;
    *viewport = renderer->target ? renderer->viewport_backup : renderer->viewport;
    *scale = renderer->target ? renderer->scale_backup : renderer->scale;
    SDL_UnlockMutex(renderer->target_mutex);
}

static SDL_bool IsSupportedBlendMode ( SDL_Renderer *  renderer, SDL_BlendMode  blendMode  )

static

Definition at line 469 of file SDL_render.c.

References SDL_BLENDMODE_ADD, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_MOD, SDL_BLENDMODE_NONE, SDL_TRUE, and SDL_Renderer::SupportsBlendMode.

Referenced by SDL_SetRenderDrawBlendMode(), and SDL_SetTextureBlendMode().

{
    switch (blendMode)
    {
    /* These are required to be supported by all renderers */
    case SDL_BLENDMODE_NONE:
    case SDL_BLENDMODE_BLEND:
    case SDL_BLENDMODE_ADD:
    case SDL_BLENDMODE_MOD:
        return SDL_TRUE;

    default:
        return renderer->SupportsBlendMode && renderer->SupportsBlendMode(renderer, blendMode);
    }
}

static SDL_bool IsSupportedFormat ( SDL_Renderer *  renderer, Uint32  format  )

static

Definition at line 486 of file SDL_render.c.

References i, SDL_Renderer::info, SDL_RendererInfo::num_texture_formats, SDL_FALSE, SDL_TRUE, and SDL_RendererInfo::texture_formats.

Referenced by SDL_CreateTexture().

{
    Uint32 i;

    for (i = 0; i < renderer->info.num_texture_formats; ++i) {
        if (renderer->info.texture_formats[i] == format) {
            return SDL_TRUE;
        }
    }
    return SDL_FALSE;
}

static int RenderDrawLinesWithRects ( SDL_Renderer *  renderer, const SDL_Point *  points, int  count  )

static

Definition at line 1704 of file SDL_render.c.

References SDL_FRect::h, i, SDL_Renderer::RenderDrawLines, SDL_Renderer::RenderFillRects, SDL_Renderer::scale, SDL_max, SDL_min, SDL_OutOfMemory, SDL_stack_alloc, SDL_stack_free, SDL_FRect::w, SDL_FPoint::x, SDL_Point::x, SDL_FRect::x, SDL_FPoint::y, SDL_FRect::y, and SDL_Point::y.

Referenced by SDL_RenderDrawLines().

{
    SDL_FRect *frect;
    SDL_FRect *frects;
    SDL_FPoint fpoints[2];
    int i, nrects;
    int status;

    frects = SDL_stack_alloc(SDL_FRect, count-1);
    if (!frects) {
        return SDL_OutOfMemory();
    }

    status = 0;
    nrects = 0;
    for (i = 0; i < count-1; ++i) {
        if (points[i].x == points[i+1].x) {
            int minY = SDL_min(points[i].y, points[i+1].y);
            int maxY = SDL_max(points[i].y, points[i+1].y);

            frect = &frects[nrects++];
            frect->x = points[i].x * renderer->scale.x;
            frect->y = minY * renderer->scale.y;
            frect->w = renderer->scale.x;
            frect->h = (maxY - minY + 1) * renderer->scale.y;
        } else if (points[i].y == points[i+1].y) {
            int minX = SDL_min(points[i].x, points[i+1].x);
            int maxX = SDL_max(points[i].x, points[i+1].x);

            frect = &frects[nrects++];
            frect->x = minX * renderer->scale.x;
            frect->y = points[i].y * renderer->scale.y;
            frect->w = (maxX - minX + 1) * renderer->scale.x;
            frect->h = renderer->scale.y;
        } else {
            /* FIXME: We can't use a rect for this line... */
            fpoints[0].x = points[i].x * renderer->scale.x;
            fpoints[0].y = points[i].y * renderer->scale.y;
            fpoints[1].x = points[i+1].x * renderer->scale.x;
            fpoints[1].y = points[i+1].y * renderer->scale.y;
            status += renderer->RenderDrawLines(renderer, fpoints, 2);
        }
    }

    status += renderer->RenderFillRects(renderer, frects, nrects);

    SDL_stack_free(frects);

    if (status < 0) {
        status = -1;
    }
    return status;
}

static int RenderDrawPointsWithRects ( SDL_Renderer *  renderer, const SDL_Point *  points, int  count  )

static

Definition at line 1624 of file SDL_render.c.

References SDL_FRect::h, i, SDL_Renderer::RenderFillRects, SDL_Renderer::scale, SDL_OutOfMemory, SDL_stack_alloc, SDL_stack_free, SDL_FRect::w, SDL_FPoint::x, SDL_FRect::x, SDL_Point::x, SDL_FPoint::y, SDL_Point::y, and SDL_FRect::y.

Referenced by SDL_RenderDrawPoints().

{
    SDL_FRect *frects;
    int i;
    int status;

    frects = SDL_stack_alloc(SDL_FRect, count);
    if (!frects) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        frects[i].x = points[i].x * renderer->scale.x;
        frects[i].y = points[i].y * renderer->scale.y;
        frects[i].w = renderer->scale.x;
        frects[i].h = renderer->scale.y;
    }

    status = renderer->RenderFillRects(renderer, frects, count);

    SDL_stack_free(frects);

    return status;
}

SDL_BlendMode SDL_ComposeCustomBlendMode	(	SDL_BlendFactor	srcColorFactor,
		SDL_BlendFactor	dstColorFactor,
		SDL_BlendOperation	colorOperation,
		SDL_BlendFactor	srcAlphaFactor,
		SDL_BlendFactor	dstAlphaFactor,
		SDL_BlendOperation	alphaOperation
	)

Create a custom blend mode, which may or may not be supported by a given renderer.

Parameters

srcColorFactor
dstColorFactor
colorOperation
srcAlphaFactor
dstAlphaFactor
alphaOperation	The result of the blend mode operation will be: dstRGB = dstRGB * dstColorFactor colorOperation srcRGB * srcColorFactor and dstA = dstA * dstAlphaFactor alphaOperation srcA * srcAlphaFactor

Definition at line 2241 of file SDL_render.c.

References blendMode, SDL_COMPOSE_BLENDMODE, and SDL_GetShortBlendMode().

{
    SDL_BlendMode blendMode = SDL_COMPOSE_BLENDMODE(srcColorFactor, dstColorFactor, colorOperation,
                                                    srcAlphaFactor, dstAlphaFactor, alphaOperation);
    return SDL_GetShortBlendMode(blendMode);
}

SDL_Renderer* SDL_CreateRenderer	(	SDL_Window *	window,
		int	index,
		Uint32	flags
	)

Create a 2D rendering context for a window.

Parameters

window	The window where rendering is displayed.
index	The index of the rendering driver to initialize, or -1 to initialize the first one supporting the requested flags.
flags	SDL_RendererFlags.

Returns

A valid rendering context or NULL if there was an error.

See Also

SDL_CreateSoftwareRenderer()

SDL_GetRendererInfo()

SDL_DestroyRenderer()

Definition at line 304 of file SDL_render.c.

References SDL_RenderDriver::CreateRenderer, SDL_Renderer::dpi_scale, SDL_RendererInfo::flags, SDL_Renderer::GetOutputSize, SDL_Renderer::hidden, SDL_Renderer::info, SDL_RenderDriver::info, SDL_Renderer::magic, SDL_RendererInfo::name, NULL, renderer, renderer_magic, SDL_Renderer::scale, SDL_AddEventWatch, SDL_CreateMutex, SDL_FALSE, SDL_GetHint, SDL_GetHintBoolean, SDL_GetNumRenderDrivers, SDL_GetRenderer, SDL_GetWindowFlags, SDL_GetWindowSize, SDL_HINT_RENDER_DRIVER, SDL_HINT_RENDER_VSYNC, SDL_LOG_CATEGORY_RENDER, SDL_LogInfo, SDL_RENDERER_PRESENTVSYNC, SDL_RendererEventWatch(), SDL_RenderSetViewport, SDL_SetError, SDL_SetWindowData, SDL_strcasecmp, SDL_TRUE, SDL_WINDOW_HIDDEN, SDL_WINDOW_MINIMIZED, SDL_WINDOWRENDERDATA, SDL_Renderer::target_mutex, SDL_Renderer::window, window_h, window_w, SDL_FPoint::x, and SDL_FPoint::y.

{
#if !SDL_RENDER_DISABLED
    SDL_Renderer *renderer = NULL;
    int n = SDL_GetNumRenderDrivers();
    const char *hint;

    if (!window) {
        SDL_SetError("Invalid window");
        return NULL;
    }

    if (SDL_GetRenderer(window)) {
        SDL_SetError("Renderer already associated with window");
        return NULL;
    }

    if (SDL_GetHint(SDL_HINT_RENDER_VSYNC)) {
        if (SDL_GetHintBoolean(SDL_HINT_RENDER_VSYNC, SDL_TRUE)) {
            flags |= SDL_RENDERER_PRESENTVSYNC;
        } else {
            flags &= ~SDL_RENDERER_PRESENTVSYNC;
        }
    }

    if (index < 0) {
        hint = SDL_GetHint(SDL_HINT_RENDER_DRIVER);
        if (hint) {
            for (index = 0; index < n; ++index) {
                const SDL_RenderDriver *driver = render_drivers[index];

                if (SDL_strcasecmp(hint, driver->info.name) == 0) {
                    /* Create a new renderer instance */
                    renderer = driver->CreateRenderer(window, flags);
                    break;
                }
            }
        }

        if (!renderer) {
            for (index = 0; index < n; ++index) {
                const SDL_RenderDriver *driver = render_drivers[index];

                if ((driver->info.flags & flags) == flags) {
                    /* Create a new renderer instance */
                    renderer = driver->CreateRenderer(window, flags);
                    if (renderer) {
                        /* Yay, we got one! */
                        break;
                    }
                }
            }
        }
        if (index == n) {
            SDL_SetError("Couldn't find matching render driver");
            return NULL;
        }
    } else {
        if (index >= SDL_GetNumRenderDrivers()) {
            SDL_SetError("index must be -1 or in the range of 0 - %d",
                         SDL_GetNumRenderDrivers() - 1);
            return NULL;
        }
        /* Create a new renderer instance */
        renderer = render_drivers[index]->CreateRenderer(window, flags);
    }

    if (renderer) {
        renderer->magic = &renderer_magic;
        renderer->window = window;
        renderer->target_mutex = SDL_CreateMutex();
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;
        renderer->dpi_scale.x = 1.0f;
        renderer->dpi_scale.y = 1.0f;

        if (window && renderer->GetOutputSize) {
            int window_w, window_h;
            int output_w, output_h;
            if (renderer->GetOutputSize(renderer, &output_w, &output_h) == 0) {
                SDL_GetWindowSize(renderer->window, &window_w, &window_h);
                renderer->dpi_scale.x = (float)window_w / output_w;
                renderer->dpi_scale.y = (float)window_h / output_h;
            }
        }

        if (SDL_GetWindowFlags(window) & (SDL_WINDOW_HIDDEN|SDL_WINDOW_MINIMIZED)) {
            renderer->hidden = SDL_TRUE;
        } else {
            renderer->hidden = SDL_FALSE;
        }

        SDL_SetWindowData(window, SDL_WINDOWRENDERDATA, renderer);

        SDL_RenderSetViewport(renderer, NULL);

        SDL_AddEventWatch(SDL_RendererEventWatch, renderer);

        SDL_LogInfo(SDL_LOG_CATEGORY_RENDER,
                    "Created renderer: %s", renderer->info.name);
    }
    return renderer;
#else
    SDL_SetError("SDL not built with rendering support");
    return NULL;
#endif
}

SDL_Renderer* SDL_CreateSoftwareRenderer

(

SDL_Surface *

surface

)

Create a 2D software rendering context for a surface.

Parameters

surface

The surface where rendering is done.

Returns

A valid rendering context or NULL if there was an error.

See Also

SDL_CreateRenderer()

SDL_DestroyRenderer()

Definition at line 413 of file SDL_render.c.

References SDL_Renderer::magic, NULL, renderer, renderer_magic, SDL_Renderer::scale, SDL_CreateMutex, SDL_RenderSetViewport, SDL_SetError, SW_CreateRendererForSurface(), SDL_Renderer::target_mutex, SDL_FPoint::x, and SDL_FPoint::y.

{
#if !SDL_RENDER_DISABLED
    SDL_Renderer *renderer;

    renderer = SW_CreateRendererForSurface(surface);

    if (renderer) {
        renderer->magic = &renderer_magic;
        renderer->target_mutex = SDL_CreateMutex();
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;

        SDL_RenderSetViewport(renderer, NULL);
    }
    return renderer;
#else
    SDL_SetError("SDL not built with rendering support");
    return NULL;
#endif /* !SDL_RENDER_DISABLED */
}

SDL_Texture* SDL_CreateTexture	(	SDL_Renderer *	renderer,
		Uint32	format,
		int	access,
		int	w,
		int	h
	)

Create a texture for a rendering context.

Parameters

renderer	The renderer.
format	The format of the texture.
access	One of the enumerated values in SDL_TextureAccess.
w	The width of the texture in pixels.
h	The height of the texture in pixels.

Returns

The created texture is returned, or NULL if no rendering context was active, the format was unsupported, or the width or height were out of range.

Note

The contents of the texture are not defined at creation.

See Also

SDL_QueryTexture()

SDL_UpdateTexture()

SDL_DestroyTexture()

Definition at line 541 of file SDL_render.c.

References SDL_Texture::a, SDL_Texture::access, SDL_Texture::b, CHECK_RENDERER_MAGIC, SDL_Renderer::CreateTexture, SDL_Texture::format, SDL_Texture::g, GetClosestSupportedFormat(), SDL_Texture::h, SDL_Renderer::info, IsSupportedFormat(), SDL_Texture::magic, SDL_RendererInfo::max_texture_height, SDL_RendererInfo::max_texture_width, SDL_Texture::native, SDL_Texture::next, NULL, SDL_Texture::pitch, SDL_Texture::pixels, SDL_Texture::prev, SDL_Texture::r, renderer, SDL_Texture::renderer, SDL_Texture::scaleMode, SDL_BYTESPERPIXEL, SDL_calloc, SDL_CreateTexture, SDL_DestroyTexture, SDL_GetScaleMode(), SDL_ISPIXELFORMAT_FOURCC, SDL_ISPIXELFORMAT_INDEXED, SDL_OutOfMemory, SDL_SetError, SDL_SW_CreateYUVTexture(), SDL_TEXTUREACCESS_STREAMING, SDL_RendererInfo::texture_formats, texture_magic, SDL_Renderer::textures, SDL_Texture::w, and SDL_Texture::yuv.

{
    SDL_Texture *texture;

    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (!format) {
        format = renderer->info.texture_formats[0];
    }
    if (SDL_BYTESPERPIXEL(format) == 0) {
        SDL_SetError("Invalid texture format");
        return NULL;
    }
    if (SDL_ISPIXELFORMAT_INDEXED(format)) {
        SDL_SetError("Palettized textures are not supported");
        return NULL;
    }
    if (w <= 0 || h <= 0) {
        SDL_SetError("Texture dimensions can't be 0");
        return NULL;
    }
    if ((renderer->info.max_texture_width && w > renderer->info.max_texture_width) ||
        (renderer->info.max_texture_height && h > renderer->info.max_texture_height)) {
        SDL_SetError("Texture dimensions are limited to %dx%d", renderer->info.max_texture_width, renderer->info.max_texture_height);
        return NULL;
    }
    texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
    if (!texture) {
        SDL_OutOfMemory();
        return NULL;
    }
    texture->magic = &texture_magic;
    texture->format = format;
    texture->access = access;
    texture->w = w;
    texture->h = h;
    texture->r = 255;
    texture->g = 255;
    texture->b = 255;
    texture->a = 255;
    texture->scaleMode = SDL_GetScaleMode();
    texture->renderer = renderer;
    texture->next = renderer->textures;
    if (renderer->textures) {
        renderer->textures->prev = texture;
    }
    renderer->textures = texture;

    if (IsSupportedFormat(renderer, format)) {
        if (renderer->CreateTexture(renderer, texture) < 0) {
            SDL_DestroyTexture(texture);
            return NULL;
        }
    } else {
        texture->native = SDL_CreateTexture(renderer,
                                GetClosestSupportedFormat(renderer, format),
                                access, w, h);
        if (!texture->native) {
            SDL_DestroyTexture(texture);
            return NULL;
        }

        /* Swap textures to have texture before texture->native in the list */
        texture->native->next = texture->next;
        if (texture->native->next) {
            texture->native->next->prev = texture->native;
        }
        texture->prev = texture->native->prev;
        if (texture->prev) {
            texture->prev->next = texture;
        }
        texture->native->prev = texture;
        texture->next = texture->native;
        renderer->textures = texture;

        if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
            texture->yuv = SDL_SW_CreateYUVTexture(format, w, h);
            if (!texture->yuv) {
                SDL_DestroyTexture(texture);
                return NULL;
            }
        } else if (access == SDL_TEXTUREACCESS_STREAMING) {
            /* The pitch is 4 byte aligned */
            texture->pitch = (((w * SDL_BYTESPERPIXEL(format)) + 3) & ~3);
            texture->pixels = SDL_calloc(1, texture->pitch * h);
            if (!texture->pixels) {
                SDL_DestroyTexture(texture);
                return NULL;
            }
        }
    }
    return texture;
}

SDL_Texture* SDL_CreateTextureFromSurface	(	SDL_Renderer *	renderer,
		SDL_Surface *	surface
	)

Create a texture from an existing surface.

Parameters

renderer	The renderer.
surface	The surface containing pixel data used to fill the texture.

Returns

The created texture is returned, or NULL on error.

Note

The surface is not modified or freed by this function.

See Also

SDL_QueryTexture()

SDL_DestroyTexture()

Definition at line 636 of file SDL_render.c.

References SDL_PixelFormat::Amask, blendMode, CHECK_RENDERER_MAGIC, SDL_Surface::format, SDL_PixelFormat::format, SDL_Surface::h, i, SDL_Renderer::info, NULL, SDL_RendererInfo::num_texture_formats, SDL_Surface::pitch, SDL_Surface::pixels, SDL_AllocFormat, SDL_BLENDMODE_BLEND, SDL_ConvertSurface, SDL_CreateTexture, SDL_DestroyTexture, SDL_FALSE, SDL_FreeFormat, SDL_FreeSurface, SDL_GetSurfaceAlphaMod, SDL_GetSurfaceBlendMode, SDL_GetSurfaceColorMod, SDL_HasColorKey, SDL_ISPIXELFORMAT_ALPHA, SDL_ISPIXELFORMAT_FOURCC, SDL_LockSurface, SDL_MUSTLOCK, SDL_SetError, SDL_SetTextureAlphaMod, SDL_SetTextureBlendMode, SDL_SetTextureColorMod, SDL_TEXTUREACCESS_STATIC, SDL_TRUE, SDL_UnlockSurface, SDL_UpdateTexture, SDL_RendererInfo::texture_formats, and SDL_Surface::w.

{
    const SDL_PixelFormat *fmt;
    SDL_bool needAlpha;
    Uint32 i;
    Uint32 format;
    SDL_Texture *texture;

    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (!surface) {
        SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
        return NULL;
    }

    /* See what the best texture format is */
    fmt = surface->format;
    if (fmt->Amask || SDL_HasColorKey(surface)) {
        needAlpha = SDL_TRUE;
    } else {
        needAlpha = SDL_FALSE;
    }
    format = renderer->info.texture_formats[0];
    for (i = 0; i < renderer->info.num_texture_formats; ++i) {
        if (!SDL_ISPIXELFORMAT_FOURCC(renderer->info.texture_formats[i]) &&
            SDL_ISPIXELFORMAT_ALPHA(renderer->info.texture_formats[i]) == needAlpha) {
            format = renderer->info.texture_formats[i];
            break;
        }
    }

    texture = SDL_CreateTexture(renderer, format, SDL_TEXTUREACCESS_STATIC,
                                surface->w, surface->h);
    if (!texture) {
        return NULL;
    }

    if (format == surface->format->format) {
        if (SDL_MUSTLOCK(surface)) {
            SDL_LockSurface(surface);
            SDL_UpdateTexture(texture, NULL, surface->pixels, surface->pitch);
            SDL_UnlockSurface(surface);
        } else {
            SDL_UpdateTexture(texture, NULL, surface->pixels, surface->pitch);
        }
    } else {
        SDL_PixelFormat *dst_fmt;
        SDL_Surface *temp = NULL;

        /* Set up a destination surface for the texture update */
        dst_fmt = SDL_AllocFormat(format);
        if (!dst_fmt) {
           SDL_DestroyTexture(texture);
           return NULL;
        }
        temp = SDL_ConvertSurface(surface, dst_fmt, 0);
        SDL_FreeFormat(dst_fmt);
        if (temp) {
            SDL_UpdateTexture(texture, NULL, temp->pixels, temp->pitch);
            SDL_FreeSurface(temp);
        } else {
            SDL_DestroyTexture(texture);
            return NULL;
        }
    }

    {
        Uint8 r, g, b, a;
        SDL_BlendMode blendMode;

        SDL_GetSurfaceColorMod(surface, &r, &g, &b);
        SDL_SetTextureColorMod(texture, r, g, b);

        SDL_GetSurfaceAlphaMod(surface, &a);
        SDL_SetTextureAlphaMod(texture, a);

        if (SDL_HasColorKey(surface)) {
            /* We converted to a texture with alpha format */
            SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
        } else {
            SDL_GetSurfaceBlendMode(surface, &blendMode);
            SDL_SetTextureBlendMode(texture, blendMode);
        }
    }
    return texture;
}

int SDL_CreateWindowAndRenderer	(	int	width,
		int	height,
		Uint32	window_flags,
		SDL_Window **	window,
		SDL_Renderer **	renderer
	)

Create a window and default renderer.

Parameters

width	The width of the window
height	The height of the window
window_flags	The flags used to create the window
window	A pointer filled with the window, or NULL on error
renderer	A pointer filled with the renderer, or NULL on error

Returns

0 on success, or -1 on error

Definition at line 284 of file SDL_render.c.

References NULL, SDL_CreateRenderer, SDL_CreateWindow, and SDL_WINDOWPOS_UNDEFINED.

{
    *window = SDL_CreateWindow(NULL, SDL_WINDOWPOS_UNDEFINED,
                                     SDL_WINDOWPOS_UNDEFINED,
                                     width, height, window_flags);
    if (!*window) {
        *renderer = NULL;
        return -1;
    }

    *renderer = SDL_CreateRenderer(*window, -1, 0);
    if (!*renderer) {
        return -1;
    }

    return 0;
}

void SDL_DestroyRenderer

(

SDL_Renderer *

renderer

)

Destroy the rendering context for a window and free associated textures.

See Also

SDL_CreateRenderer()

Definition at line 2124 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::DestroyRenderer, SDL_Renderer::magic, NULL, SDL_assert, SDL_DelEventWatch, SDL_DestroyMutex, SDL_DestroyTexture, SDL_RendererEventWatch(), SDL_SetWindowData, SDL_WINDOWRENDERDATA, SDL_Renderer::target_mutex, SDL_Renderer::textures, void, and SDL_Renderer::window.

{
    CHECK_RENDERER_MAGIC(renderer, );

    SDL_DelEventWatch(SDL_RendererEventWatch, renderer);

    /* Free existing textures for this renderer */
    while (renderer->textures) {
        SDL_Texture *tex = renderer->textures; (void) tex;
        SDL_DestroyTexture(renderer->textures);
        SDL_assert(tex != renderer->textures);  /* satisfy static analysis. */
    }

    if (renderer->window) {
        SDL_SetWindowData(renderer->window, SDL_WINDOWRENDERDATA, NULL);
    }

    /* It's no longer magical... */
    renderer->magic = NULL;

    /* Free the target mutex */
    SDL_DestroyMutex(renderer->target_mutex);
    renderer->target_mutex = NULL;

    /* Free the renderer instance */
    renderer->DestroyRenderer(renderer);
}

void SDL_DestroyTexture

(

SDL_Texture *

texture

)

Destroy the specified texture.

See Also

SDL_CreateTexture()

SDL_CreateTextureFromSurface()

Definition at line 2089 of file SDL_render.c.

References CHECK_TEXTURE_MAGIC, SDL_Renderer::DestroyTexture, SDL_Texture::magic, SDL_Texture::native, SDL_Texture::next, NULL, SDL_Texture::pixels, SDL_Texture::prev, renderer, SDL_Texture::renderer, SDL_DestroyTexture, SDL_free, SDL_SetRenderTarget, SDL_SW_DestroyYUVTexture(), SDL_Renderer::target, SDL_Renderer::textures, and SDL_Texture::yuv.

{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, );

    renderer = texture->renderer;
    if (texture == renderer->target) {
        SDL_SetRenderTarget(renderer, NULL);
    }

    texture->magic = NULL;

    if (texture->next) {
        texture->next->prev = texture->prev;
    }
    if (texture->prev) {
        texture->prev->next = texture->next;
    } else {
        renderer->textures = texture->next;
    }

    if (texture->native) {
        SDL_DestroyTexture(texture->native);
    }
    if (texture->yuv) {
        SDL_SW_DestroyYUVTexture(texture->yuv);
    }
    SDL_free(texture->pixels);

    renderer->DestroyTexture(renderer, texture);
    SDL_free(texture);
}

SDL_BlendOperation SDL_GetBlendModeAlphaOperation

(

SDL_BlendMode

blendMode

)

Definition at line 2287 of file SDL_render.c.

References SDL_GetLongBlendMode().

{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendOperation)(((Uint32)blendMode >> 16) & 0xF);
}

SDL_BlendOperation SDL_GetBlendModeColorOperation

(

SDL_BlendMode

blendMode

)

Definition at line 2266 of file SDL_render.c.

References SDL_GetLongBlendMode().

{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendOperation)(((Uint32)blendMode >> 0) & 0xF);
}

SDL_BlendFactor SDL_GetBlendModeDstAlphaFactor

(

SDL_BlendMode

blendMode

)

Definition at line 2280 of file SDL_render.c.

References SDL_GetLongBlendMode().

{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 24) & 0xF);
}

SDL_BlendFactor SDL_GetBlendModeDstColorFactor

(

SDL_BlendMode

blendMode

)

Definition at line 2259 of file SDL_render.c.

References SDL_GetLongBlendMode().

{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 8) & 0xF);
}

SDL_BlendFactor SDL_GetBlendModeSrcAlphaFactor

(

SDL_BlendMode

blendMode

)

Definition at line 2273 of file SDL_render.c.

References SDL_GetLongBlendMode().

{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 20) & 0xF);
}

SDL_BlendFactor SDL_GetBlendModeSrcColorFactor

(

SDL_BlendMode

blendMode

)

Definition at line 2252 of file SDL_render.c.

References SDL_GetLongBlendMode().

{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 4) & 0xF);
}

static SDL_BlendMode SDL_GetLongBlendMode ( SDL_BlendMode  blendMode )

static

Definition at line 2223 of file SDL_render.c.

References blendMode, SDL_BLENDMODE_ADD, SDL_BLENDMODE_ADD_FULL, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_BLEND_FULL, SDL_BLENDMODE_MOD, SDL_BLENDMODE_MOD_FULL, SDL_BLENDMODE_NONE, and SDL_BLENDMODE_NONE_FULL.

Referenced by SDL_GetBlendModeAlphaOperation(), SDL_GetBlendModeColorOperation(), SDL_GetBlendModeDstAlphaFactor(), SDL_GetBlendModeDstColorFactor(), SDL_GetBlendModeSrcAlphaFactor(), and SDL_GetBlendModeSrcColorFactor().

{
    if (blendMode == SDL_BLENDMODE_NONE) {
        return SDL_BLENDMODE_NONE_FULL;
    }
    if (blendMode == SDL_BLENDMODE_BLEND) {
        return SDL_BLENDMODE_BLEND_FULL;
    }
    if (blendMode == SDL_BLENDMODE_ADD) {
        return SDL_BLENDMODE_ADD_FULL;
    }
    if (blendMode == SDL_BLENDMODE_MOD) {
        return SDL_BLENDMODE_MOD_FULL;
    }
    return blendMode;
}

int SDL_GetNumRenderDrivers

(

void

)

Get the number of 2D rendering drivers available for the current display.

A render driver is a set of code that handles rendering and texture management on a particular display. Normally there is only one, but some drivers may have several available with different capabilities.

See Also

SDL_GetRenderDriverInfo()

SDL_CreateRenderer()

Definition at line 111 of file SDL_render.c.

References SDL_arraysize.

{
#if !SDL_RENDER_DISABLED
    return SDL_arraysize(render_drivers);
#else
    return 0;
#endif
}

int SDL_GetRenderDrawBlendMode	(	SDL_Renderer *	renderer,
		SDL_BlendMode *	blendMode
	)

Get the blend mode used for drawing operations.

Parameters

renderer	The renderer from which blend mode should be queried.
blendMode	A pointer filled in with the current blend mode.

Returns

0 on success, or -1 on error

See Also

SDL_SetRenderDrawBlendMode()

Definition at line 1593 of file SDL_render.c.

References SDL_Renderer::blendMode, and CHECK_RENDERER_MAGIC.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    *blendMode = renderer->blendMode;
    return 0;
}

int SDL_GetRenderDrawColor	(	SDL_Renderer *	renderer,
		Uint8 *	r,
		Uint8 *	g,
		Uint8 *	b,
		Uint8 *	a
	)

Get the color used for drawing operations (Rect, Line and Clear).

Parameters

renderer	The renderer from which drawing color should be queried.
r	A pointer to the red value used to draw on the rendering target.
g	A pointer to the green value used to draw on the rendering target.
b	A pointer to the blue value used to draw on the rendering target.
a	A pointer to the alpha value used to draw on the rendering target, usually SDL_ALPHA_OPAQUE (255).

Returns

0 on success, or -1 on error

Definition at line 1560 of file SDL_render.c.

References SDL_Renderer::a, SDL_Renderer::b, CHECK_RENDERER_MAGIC, SDL_Renderer::g, and SDL_Renderer::r.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (r) {
        *r = renderer->r;
    }
    if (g) {
        *g = renderer->g;
    }
    if (b) {
        *b = renderer->b;
    }
    if (a) {
        *a = renderer->a;
    }
    return 0;
}

int SDL_GetRenderDriverInfo	(	int	index,
		SDL_RendererInfo *	info
	)

Get information about a specific 2D rendering driver for the current display.

Parameters

index	The index of the driver to query information about.
info	A pointer to an SDL_RendererInfo struct to be filled with information on the rendering driver.

Returns

0 on success, -1 if the index was out of range.

See Also

SDL_CreateRenderer()

Definition at line 121 of file SDL_render.c.

References SDL_RenderDriver::info, SDL_GetNumRenderDrivers, and SDL_SetError.

{
#if !SDL_RENDER_DISABLED
    if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
        return SDL_SetError("index must be in the range of 0 - %d",
                            SDL_GetNumRenderDrivers() - 1);
    }
    *info = render_drivers[index]->info;
    return 0;
#else
    return SDL_SetError("SDL not built with rendering support");
#endif
}

SDL_Renderer* SDL_GetRenderer

(

SDL_Window *

window

)

Get the renderer associated with a window.

Definition at line 436 of file SDL_render.c.

References SDL_GetWindowData, and SDL_WINDOWRENDERDATA.

{
    return (SDL_Renderer *)SDL_GetWindowData(window, SDL_WINDOWRENDERDATA);
}

int SDL_GetRendererInfo	(	SDL_Renderer *	renderer,
		SDL_RendererInfo *	info
	)

Get information about a rendering context.

Definition at line 442 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, and SDL_Renderer::info.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    *info = renderer->info;
    return 0;
}

int SDL_GetRendererOutputSize	(	SDL_Renderer *	renderer,
		int *	w,
		int *	h
	)

Get the output size in pixels of a rendering context.

Definition at line 451 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::GetOutputSize, NULL, SDL_assert, SDL_GetWindowSize, SDL_QueryTexture, SDL_SetError, SDL_Renderer::target, and SDL_Renderer::window.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (renderer->target) {
        return SDL_QueryTexture(renderer->target, NULL, NULL, w, h);
    } else if (renderer->GetOutputSize) {
        return renderer->GetOutputSize(renderer, w, h);
    } else if (renderer->window) {
        SDL_GetWindowSize(renderer->window, w, h);
        return 0;
    } else {
        SDL_assert(0 && "This should never happen");
        return SDL_SetError("Renderer doesn't support querying output size");
    }
}

SDL_Texture* SDL_GetRenderTarget

(

SDL_Renderer *

renderer

)

Get the current render target or NULL for the default render target.

Returns

The current render target

See Also

SDL_SetRenderTarget()

Definition at line 1287 of file SDL_render.c.

References SDL_Renderer::target.

{
    return renderer->target;
}

static SDL_ScaleMode SDL_GetScaleMode ( void  )

static

Definition at line 525 of file SDL_render.c.

References SDL_atoi, SDL_GetHint, SDL_HINT_RENDER_SCALE_QUALITY, SDL_ScaleModeBest, SDL_ScaleModeLinear, SDL_ScaleModeNearest, and SDL_strcasecmp.

Referenced by SDL_CreateTexture().

{
    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);

    if (!hint || SDL_strcasecmp(hint, "nearest") == 0) {
        return SDL_ScaleModeNearest;
    } else if (SDL_strcasecmp(hint, "linear") == 0) {
        return SDL_ScaleModeLinear;
    } else if (SDL_strcasecmp(hint, "best") == 0) {
        return SDL_ScaleModeBest;
    } else {
        return (SDL_ScaleMode)SDL_atoi(hint);
    }
}

static SDL_BlendMode SDL_GetShortBlendMode ( SDL_BlendMode  blendMode )

static

Definition at line 2205 of file SDL_render.c.

References blendMode, SDL_BLENDMODE_ADD, SDL_BLENDMODE_ADD_FULL, SDL_BLENDMODE_BLEND, SDL_BLENDMODE_BLEND_FULL, SDL_BLENDMODE_MOD, SDL_BLENDMODE_MOD_FULL, SDL_BLENDMODE_NONE, and SDL_BLENDMODE_NONE_FULL.

Referenced by SDL_ComposeCustomBlendMode().

{
    if (blendMode == SDL_BLENDMODE_NONE_FULL) {
        return SDL_BLENDMODE_NONE;
    }
    if (blendMode == SDL_BLENDMODE_BLEND_FULL) {
        return SDL_BLENDMODE_BLEND;
    }
    if (blendMode == SDL_BLENDMODE_ADD_FULL) {
        return SDL_BLENDMODE_ADD;
    }
    if (blendMode == SDL_BLENDMODE_MOD_FULL) {
        return SDL_BLENDMODE_MOD;
    }
    return blendMode;
}

int SDL_GetTextureAlphaMod	(	SDL_Texture *	texture,
		Uint8 *	alpha
	)

Get the additional alpha value used in render copy operations.

Parameters

texture	The texture to query.
alpha	A pointer filled in with the current alpha value.

Returns

0 on success, or -1 if the texture is not valid.

See Also

SDL_SetTextureAlphaMod()

Definition at line 811 of file SDL_render.c.

References SDL_Texture::a, and CHECK_TEXTURE_MAGIC.

{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (alpha) {
        *alpha = texture->a;
    }
    return 0;
}

int SDL_GetTextureBlendMode	(	SDL_Texture *	texture,
		SDL_BlendMode *	blendMode
	)

Get the blend mode used for texture copy operations.

Parameters

texture	The texture to query.
blendMode	A pointer filled in with the current blend mode.

Returns

0 on success, or -1 if the texture is not valid.

See Also

SDL_SetTextureBlendMode()

Definition at line 843 of file SDL_render.c.

References SDL_Texture::blendMode, and CHECK_TEXTURE_MAGIC.

{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (blendMode) {
        *blendMode = texture->blendMode;
    }
    return 0;
}

int SDL_GetTextureColorMod	(	SDL_Texture *	texture,
		Uint8 *	r,
		Uint8 *	g,
		Uint8 *	b
	)

Get the additional color value used in render copy operations.

Parameters

texture	The texture to query.
r	A pointer filled in with the current red color value.
g	A pointer filled in with the current green color value.
b	A pointer filled in with the current blue color value.

Returns

0 on success, or -1 if the texture is not valid.

See Also

SDL_SetTextureColorMod()

Definition at line 770 of file SDL_render.c.

References SDL_Texture::b, CHECK_TEXTURE_MAGIC, SDL_Texture::g, and SDL_Texture::r.

{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (r) {
        *r = texture->r;
    }
    if (g) {
        *g = texture->g;
    }
    if (b) {
        *b = texture->b;
    }
    return 0;
}

int SDL_GL_BindTexture	(	SDL_Texture *	texture,
		float *	texw,
		float *	texh
	)

Bind the texture to the current OpenGL/ES/ES2 context for use with OpenGL instructions.

Parameters

texture	The SDL texture to bind
texw	A pointer to a float that will be filled with the texture width
texh	A pointer to a float that will be filled with the texture height

Returns

0 on success, or -1 if the operation is not supported

Definition at line 2152 of file SDL_render.c.

References CHECK_TEXTURE_MAGIC, SDL_Renderer::GL_BindTexture, SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_GL_BindTexture, and SDL_Unsupported.

{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);
    renderer = texture->renderer;
    if (texture->native) {
        return SDL_GL_BindTexture(texture->native, texw, texh);
    } else if (renderer && renderer->GL_BindTexture) {
        return renderer->GL_BindTexture(renderer, texture, texw, texh);
    } else {
        return SDL_Unsupported();
    }
}

int SDL_GL_UnbindTexture

(

SDL_Texture *

texture

)

Unbind a texture from the current OpenGL/ES/ES2 context.

Parameters

texture

The SDL texture to unbind

Returns

0 on success, or -1 if the operation is not supported

Definition at line 2167 of file SDL_render.c.

References CHECK_TEXTURE_MAGIC, SDL_Renderer::GL_UnbindTexture, SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_GL_UnbindTexture, and SDL_Unsupported.

{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);
    renderer = texture->renderer;
    if (texture->native) {
        return SDL_GL_UnbindTexture(texture->native);
    } else if (renderer && renderer->GL_UnbindTexture) {
        return renderer->GL_UnbindTexture(renderer, texture);
    }

    return SDL_Unsupported();
}

int SDL_LockTexture	(	SDL_Texture *	texture,
		const SDL_Rect *	rect,
		void **	pixels,
		int *	pitch
	)

Lock a portion of the texture for write-only pixel access.

Parameters

texture	The texture to lock for access, which was created with SDL_TEXTUREACCESS_STREAMING.
rect	A pointer to the rectangle to lock for access. If the rect is NULL, the entire texture will be locked.
pixels	This is filled in with a pointer to the locked pixels, appropriately offset by the locked area.
pitch	This is filled in with the pitch of the locked pixels.

Returns

0 on success, or -1 if the texture is not valid or was not created with SDL_TEXTUREACCESS_STREAMING.

See Also

SDL_UnlockTexture()

Definition at line 1108 of file SDL_render.c.

References SDL_Texture::access, CHECK_TEXTURE_MAGIC, SDL_Texture::h, SDL_Rect::h, SDL_Renderer::LockTexture, SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_LockTextureNative(), SDL_LockTextureYUV(), SDL_SetError, SDL_TEXTUREACCESS_STREAMING, SDL_Texture::w, SDL_Rect::w, SDL_Rect::x, SDL_Rect::y, and SDL_Texture::yuv.

{
    SDL_Renderer *renderer;
    SDL_Rect full_rect;

    CHECK_TEXTURE_MAGIC(texture, -1);

    if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
        return SDL_SetError("SDL_LockTexture(): texture must be streaming");
    }

    if (!rect) {
        full_rect.x = 0;
        full_rect.y = 0;
        full_rect.w = texture->w;
        full_rect.h = texture->h;
        rect = &full_rect;
    }

    if (texture->yuv) {
        return SDL_LockTextureYUV(texture, rect, pixels, pitch);
    } else if (texture->native) {
        return SDL_LockTextureNative(texture, rect, pixels, pitch);
    } else {
        renderer = texture->renderer;
        return renderer->LockTexture(renderer, texture, rect, pixels, pitch);
    }
}

static int SDL_LockTextureNative ( SDL_Texture *  texture, const SDL_Rect *  rect, void **  pixels, int *  pitch  )

static

Definition at line 1096 of file SDL_render.c.

References SDL_Texture::format, SDL_Texture::locked_rect, SDL_Texture::pitch, SDL_Texture::pixels, rect, SDL_BYTESPERPIXEL, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_LockTexture().

{
    texture->locked_rect = *rect;
    *pixels = (void *) ((Uint8 *) texture->pixels +
                        rect->y * texture->pitch +
                        rect->x * SDL_BYTESPERPIXEL(texture->format));
    *pitch = texture->pitch;
    return 0;
}

static int SDL_LockTextureYUV ( SDL_Texture *  texture, const SDL_Rect *  rect, void **  pixels, int *  pitch  )

static

Definition at line 1089 of file SDL_render.c.

References SDL_SW_LockYUVTexture(), and SDL_Texture::yuv.

Referenced by SDL_LockTexture().

{
    return SDL_SW_LockYUVTexture(texture->yuv, rect, pixels, pitch);
}

int SDL_QueryTexture	(	SDL_Texture *	texture,
		Uint32 *	format,
		int *	access,
		int *	w,
		int *	h
	)

Query the attributes of a texture.

Parameters

texture	A texture to be queried.
format	A pointer filled in with the raw format of the texture. The actual format may differ, but pixel transfers will use this format.
access	A pointer filled in with the actual access to the texture.
w	A pointer filled in with the width of the texture in pixels.
h	A pointer filled in with the height of the texture in pixels.

Returns

0 on success, or -1 if the texture is not valid.

Definition at line 724 of file SDL_render.c.

References SDL_Texture::access, CHECK_TEXTURE_MAGIC, SDL_Texture::format, SDL_Texture::h, and SDL_Texture::w.

{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (format) {
        *format = texture->format;
    }
    if (access) {
        *access = texture->access;
    }
    if (w) {
        *w = texture->w;
    }
    if (h) {
        *h = texture->h;
    }
    return 0;
}

int SDL_RenderClear

(

SDL_Renderer *

renderer

)

Clear the current rendering target with the drawing color.

This function clears the entire rendering target, ignoring the viewport and the clip rectangle.

Returns

0 on success, or -1 on error

Definition at line 1602 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::hidden, and SDL_Renderer::RenderClear.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
    return renderer->RenderClear(renderer);
}

int SDL_RenderCopy	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture,
		const SDL_Rect *	srcrect,
		const SDL_Rect *	dstrect
	)

Copy a portion of the texture to the current rendering target.

Parameters

renderer	The renderer which should copy parts of a texture.
texture	The source texture.
srcrect	A pointer to the source rectangle, or NULL for the entire texture.
dstrect	A pointer to the destination rectangle, or NULL for the entire rendering target.

Returns

0 on success, or -1 on error

Definition at line 1916 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, CHECK_TEXTURE_MAGIC, SDL_FRect::h, SDL_Texture::h, SDL_Rect::h, SDL_Renderer::hidden, SDL_Texture::native, SDL_Renderer::RenderCopy, SDL_Texture::renderer, SDL_Renderer::scale, SDL_HasIntersection, SDL_IntersectRect, SDL_RenderGetViewport, SDL_SetError, SDL_FRect::w, SDL_Texture::w, SDL_Rect::w, SDL_FPoint::x, SDL_FRect::x, SDL_Rect::x, SDL_FPoint::y, SDL_FRect::y, and SDL_Rect::y.

{
    SDL_Rect real_srcrect = { 0, 0, 0, 0 };
    SDL_Rect real_dstrect = { 0, 0, 0, 0 };
    SDL_FRect frect;

    CHECK_RENDERER_MAGIC(renderer, -1);
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (renderer != texture->renderer) {
        return SDL_SetError("Texture was not created with this renderer");
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    real_srcrect.x = 0;
    real_srcrect.y = 0;
    real_srcrect.w = texture->w;
    real_srcrect.h = texture->h;
    if (srcrect) {
        if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
            return 0;
        }
    }

    SDL_RenderGetViewport(renderer, &real_dstrect);
    real_dstrect.x = 0;
    real_dstrect.y = 0;
    if (dstrect) {
        if (!SDL_HasIntersection(dstrect, &real_dstrect)) {
            return 0;
        }
        real_dstrect = *dstrect;
    }

    if (texture->native) {
        texture = texture->native;
    }

    frect.x = real_dstrect.x * renderer->scale.x;
    frect.y = real_dstrect.y * renderer->scale.y;
    frect.w = real_dstrect.w * renderer->scale.x;
    frect.h = real_dstrect.h * renderer->scale.y;

    return renderer->RenderCopy(renderer, texture, &real_srcrect, &frect);
}

int SDL_RenderCopyEx	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture,
		const SDL_Rect *	srcrect,
		const SDL_Rect *	dstrect,
		const double	angle,
		const SDL_Point *	center,
		const SDL_RendererFlip	flip
	)

Copy a portion of the source texture to the current rendering target, rotating it by angle around the given center.

Parameters

renderer	The renderer which should copy parts of a texture.
texture	The source texture.
srcrect	A pointer to the source rectangle, or NULL for the entire texture.
dstrect	A pointer to the destination rectangle, or NULL for the entire rendering target.
angle	An angle in degrees that indicates the rotation that will be applied to dstrect, rotating it in a clockwise direction
center	A pointer to a point indicating the point around which dstrect will be rotated (if NULL, rotation will be done around dstrect.w/2, dstrect.h/2).
flip	An SDL_RendererFlip value stating which flipping actions should be performed on the texture

Returns

0 on success, or -1 on error

Definition at line 1969 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, CHECK_TEXTURE_MAGIC, SDL_FRect::h, SDL_Texture::h, SDL_Rect::h, SDL_Renderer::hidden, SDL_Texture::native, SDL_Renderer::RenderCopyEx, SDL_Texture::renderer, SDL_Renderer::scale, SDL_FLIP_NONE, SDL_IntersectRect, SDL_RenderCopy, SDL_RenderGetViewport, SDL_SetError, SDL_FRect::w, SDL_Texture::w, SDL_Rect::w, SDL_FPoint::x, SDL_Point::x, SDL_FRect::x, SDL_Rect::x, SDL_FPoint::y, SDL_Point::y, SDL_FRect::y, and SDL_Rect::y.

{
    SDL_Rect real_srcrect = { 0, 0, 0, 0 };
    SDL_Rect real_dstrect = { 0, 0, 0, 0 };
    SDL_Point real_center;
    SDL_FRect frect;
    SDL_FPoint fcenter;

    if (flip == SDL_FLIP_NONE && (int)(angle/360) == angle/360) { /* fast path when we don't need rotation or flipping */
        return SDL_RenderCopy(renderer, texture, srcrect, dstrect);
    }

    CHECK_RENDERER_MAGIC(renderer, -1);
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (renderer != texture->renderer) {
        return SDL_SetError("Texture was not created with this renderer");
    }
    if (!renderer->RenderCopyEx) {
        return SDL_SetError("Renderer does not support RenderCopyEx");
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    real_srcrect.x = 0;
    real_srcrect.y = 0;
    real_srcrect.w = texture->w;
    real_srcrect.h = texture->h;
    if (srcrect) {
        if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
            return 0;
        }
    }

    /* We don't intersect the dstrect with the viewport as RenderCopy does because of potential rotation clipping issues... TODO: should we? */
    if (dstrect) {
        real_dstrect = *dstrect;
    } else {
        SDL_RenderGetViewport(renderer, &real_dstrect);
        real_dstrect.x = 0;
        real_dstrect.y = 0;
    }

    if (texture->native) {
        texture = texture->native;
    }

    if (center) {
        real_center = *center;
    } else {
        real_center.x = real_dstrect.w/2;
        real_center.y = real_dstrect.h/2;
    }

    frect.x = real_dstrect.x * renderer->scale.x;
    frect.y = real_dstrect.y * renderer->scale.y;
    frect.w = real_dstrect.w * renderer->scale.x;
    frect.h = real_dstrect.h * renderer->scale.y;

    fcenter.x = real_center.x * renderer->scale.x;
    fcenter.y = real_center.y * renderer->scale.y;

    return renderer->RenderCopyEx(renderer, texture, &real_srcrect, &frect, angle, &fcenter, flip);
}

int SDL_RenderDrawLine	(	SDL_Renderer *	renderer,
		int	x1,
		int	y1,
		int	x2,
		int	y2
	)

Draw a line on the current rendering target.

Parameters

renderer	The renderer which should draw a line.
x1	The x coordinate of the start point.
y1	The y coordinate of the start point.
x2	The x coordinate of the end point.
y2	The y coordinate of the end point.

Returns

0 on success, or -1 on error

Definition at line 1692 of file SDL_render.c.

References SDL_RenderDrawLines, SDL_Point::x, and SDL_Point::y.

{
    SDL_Point points[2];

    points[0].x = x1;
    points[0].y = y1;
    points[1].x = x2;
    points[1].y = y2;
    return SDL_RenderDrawLines(renderer, points, 2);
}

int SDL_RenderDrawLines	(	SDL_Renderer *	renderer,
		const SDL_Point *	points,
		int	count
	)

Draw a series of connected lines on the current rendering target.

Parameters

renderer	The renderer which should draw multiple lines.
points	The points along the lines
count	The number of points, drawing count-1 lines

Returns

0 on success, or -1 on error

Definition at line 1760 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::hidden, i, SDL_Renderer::RenderDrawLines, RenderDrawLinesWithRects(), SDL_Renderer::scale, SDL_OutOfMemory, SDL_SetError, SDL_stack_alloc, SDL_stack_free, SDL_FPoint::x, SDL_Point::x, SDL_FPoint::y, and SDL_Point::y.

{
    SDL_FPoint *fpoints;
    int i;
    int status;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!points) {
        return SDL_SetError("SDL_RenderDrawLines(): Passed NULL points");
    }
    if (count < 2) {
        return 0;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
        return RenderDrawLinesWithRects(renderer, points, count);
    }

    fpoints = SDL_stack_alloc(SDL_FPoint, count);
    if (!fpoints) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        fpoints[i].x = points[i].x * renderer->scale.x;
        fpoints[i].y = points[i].y * renderer->scale.y;
    }

    status = renderer->RenderDrawLines(renderer, fpoints, count);

    SDL_stack_free(fpoints);

    return status;
}

int SDL_RenderDrawPoint	(	SDL_Renderer *	renderer,
		int	x,
		int	y
	)

Draw a point on the current rendering target.

Parameters

renderer	The renderer which should draw a point.
x	The x coordinate of the point.
y	The y coordinate of the point.

Returns

0 on success, or -1 on error

Definition at line 1614 of file SDL_render.c.

References SDL_RenderDrawPoints, SDL_Point::x, and SDL_Point::y.

{
    SDL_Point point;

    point.x = x;
    point.y = y;
    return SDL_RenderDrawPoints(renderer, &point, 1);
}

int SDL_RenderDrawPoints	(	SDL_Renderer *	renderer,
		const SDL_Point *	points,
		int	count
	)

Draw multiple points on the current rendering target.

Parameters

renderer	The renderer which should draw multiple points.
points	The points to draw
count	The number of points to draw

Returns

0 on success, or -1 on error

Definition at line 1650 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::hidden, i, SDL_Renderer::RenderDrawPoints, RenderDrawPointsWithRects(), SDL_Renderer::scale, SDL_OutOfMemory, SDL_SetError, SDL_stack_alloc, SDL_stack_free, SDL_FPoint::x, SDL_Point::x, SDL_FPoint::y, and SDL_Point::y.

{
    SDL_FPoint *fpoints;
    int i;
    int status;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!points) {
        return SDL_SetError("SDL_RenderDrawPoints(): Passed NULL points");
    }
    if (count < 1) {
        return 0;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
        return RenderDrawPointsWithRects(renderer, points, count);
    }

    fpoints = SDL_stack_alloc(SDL_FPoint, count);
    if (!fpoints) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        fpoints[i].x = points[i].x * renderer->scale.x;
        fpoints[i].y = points[i].y * renderer->scale.y;
    }

    status = renderer->RenderDrawPoints(renderer, fpoints, count);

    SDL_stack_free(fpoints);

    return status;
}

int SDL_RenderDrawRect	(	SDL_Renderer *	renderer,
		const SDL_Rect *	rect
	)

Draw a rectangle on the current rendering target.

Parameters

renderer	The renderer which should draw a rectangle.
rect	A pointer to the destination rectangle, or NULL to outline the entire rendering target.

Returns

0 on success, or -1 on error

Definition at line 1802 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Rect::h, SDL_RenderDrawLines, SDL_RenderGetViewport, SDL_Rect::w, SDL_Point::x, SDL_Rect::x, SDL_Point::y, and SDL_Rect::y.

{
    SDL_Rect full_rect;
    SDL_Point points[5];

    CHECK_RENDERER_MAGIC(renderer, -1);

    /* If 'rect' == NULL, then outline the whole surface */
    if (!rect) {
        SDL_RenderGetViewport(renderer, &full_rect);
        full_rect.x = 0;
        full_rect.y = 0;
        rect = &full_rect;
    }

    points[0].x = rect->x;
    points[0].y = rect->y;
    points[1].x = rect->x+rect->w-1;
    points[1].y = rect->y;
    points[2].x = rect->x+rect->w-1;
    points[2].y = rect->y+rect->h-1;
    points[3].x = rect->x;
    points[3].y = rect->y+rect->h-1;
    points[4].x = rect->x;
    points[4].y = rect->y;
    return SDL_RenderDrawLines(renderer, points, 5);
}

int SDL_RenderDrawRects	(	SDL_Renderer *	renderer,
		const SDL_Rect *	rects,
		int	count
	)

Draw some number of rectangles on the current rendering target.

Parameters

renderer	The renderer which should draw multiple rectangles.
rects	A pointer to an array of destination rectangles.
count	The number of rectangles.

Returns

0 on success, or -1 on error

Definition at line 1831 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::hidden, i, SDL_RenderDrawRect, and SDL_SetError.

{
    int i;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!rects) {
        return SDL_SetError("SDL_RenderDrawRects(): Passed NULL rects");
    }
    if (count < 1) {
        return 0;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    for (i = 0; i < count; ++i) {
        if (SDL_RenderDrawRect(renderer, &rects[i]) < 0) {
            return -1;
        }
    }
    return 0;
}

static int SDL_RendererEventWatch ( void *  userdata, SDL_Event *  event  )

static

Definition at line 146 of file SDL_render.c.

References SDL_Event::button, SDL_Renderer::dpi_scale, SDL_WindowEvent::event, SDL_Renderer::GetOutputSize, GetWindowViewportValues(), SDL_Rect::h, SDL_Renderer::hidden, SDL_Renderer::logical_w, SDL_Event::motion, NULL, renderer, SDL_FALSE, SDL_FINGERDOWN, SDL_FINGERMOTION, SDL_FINGERUP, SDL_GetRendererOutputSize, SDL_GetRenderTarget, SDL_GetWindowFlags, SDL_GetWindowFromID, SDL_GetWindowSize, SDL_max, SDL_min, SDL_MOUSEBUTTONDOWN, SDL_MOUSEBUTTONUP, SDL_MOUSEMOTION, SDL_SetRenderTarget, SDL_TRUE, SDL_WINDOW_HIDDEN, SDL_WINDOW_MINIMIZED, SDL_WINDOWEVENT, SDL_WINDOWEVENT_HIDDEN, SDL_WINDOWEVENT_MAXIMIZED, SDL_WINDOWEVENT_MINIMIZED, SDL_WINDOWEVENT_RESTORED, SDL_WINDOWEVENT_SHOWN, SDL_WINDOWEVENT_SIZE_CHANGED, SDL_Renderer::target, SDL_Event::type, UpdateLogicalSize(), SDL_Renderer::UpdateViewport, viewport, SDL_Renderer::viewport, SDL_Renderer::viewport_backup, SDL_Rect::w, SDL_Renderer::window, SDL_Event::window, SDL_Renderer::WindowEvent, SDL_WindowEvent::windowID, SDL_MouseMotionEvent::windowID, SDL_MouseButtonEvent::windowID, SDL_FPoint::x, SDL_Rect::x, SDL_MouseMotionEvent::x, SDL_MouseButtonEvent::x, SDL_MouseMotionEvent::xrel, SDL_FPoint::y, SDL_Rect::y, SDL_MouseMotionEvent::y, SDL_MouseButtonEvent::y, and SDL_MouseMotionEvent::yrel.

Referenced by SDL_CreateRenderer(), and SDL_DestroyRenderer().

{
    SDL_Renderer *renderer = (SDL_Renderer *)userdata;

    if (event->type == SDL_WINDOWEVENT) {
        SDL_Window *window = SDL_GetWindowFromID(event->window.windowID);
        if (window == renderer->window) {
            if (renderer->WindowEvent) {
                renderer->WindowEvent(renderer, &event->window);
            }

            if (event->window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
                /* Make sure we're operating on the default render target */
                SDL_Texture *saved_target = SDL_GetRenderTarget(renderer);
                if (saved_target) {
                    SDL_SetRenderTarget(renderer, NULL);
                }

                if (renderer->logical_w) {
                    UpdateLogicalSize(renderer);
                } else {
                    /* Window was resized, reset viewport */
                    int w, h;

                    if (renderer->GetOutputSize) {
                        renderer->GetOutputSize(renderer, &w, &h);
                    } else {
                        SDL_GetWindowSize(renderer->window, &w, &h);
                    }

                    if (renderer->target) {
                        renderer->viewport_backup.x = 0;
                        renderer->viewport_backup.y = 0;
                        renderer->viewport_backup.w = w;
                        renderer->viewport_backup.h = h;
                    } else {
                        renderer->viewport.x = 0;
                        renderer->viewport.y = 0;
                        renderer->viewport.w = w;
                        renderer->viewport.h = h;
                        renderer->UpdateViewport(renderer);
                    }
                }

                if (saved_target) {
                    SDL_SetRenderTarget(renderer, saved_target);
                }
            } else if (event->window.event == SDL_WINDOWEVENT_HIDDEN) {
                renderer->hidden = SDL_TRUE;
            } else if (event->window.event == SDL_WINDOWEVENT_SHOWN) {
                if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)) {
                    renderer->hidden = SDL_FALSE;
                }
            } else if (event->window.event == SDL_WINDOWEVENT_MINIMIZED) {
                renderer->hidden = SDL_TRUE;
            } else if (event->window.event == SDL_WINDOWEVENT_RESTORED || 
                       event->window.event == SDL_WINDOWEVENT_MAXIMIZED) {
                if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_HIDDEN)) {
                    renderer->hidden = SDL_FALSE;
                }
            }
        }
    } else if (event->type == SDL_MOUSEMOTION) {
        SDL_Window *window = SDL_GetWindowFromID(event->motion.windowID);
        if (window == renderer->window) {
            int logical_w, logical_h;
            SDL_Rect viewport;
            SDL_FPoint scale;
            GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
            if (logical_w) {
                event->motion.x -= (int)(viewport.x * renderer->dpi_scale.x);
                event->motion.y -= (int)(viewport.y * renderer->dpi_scale.y);
                event->motion.x = (int)(event->motion.x / (scale.x * renderer->dpi_scale.x));
                event->motion.y = (int)(event->motion.y / (scale.y * renderer->dpi_scale.y));
                if (event->motion.xrel > 0) {
                    event->motion.xrel = SDL_max(1, (int)(event->motion.xrel / (scale.x * renderer->dpi_scale.x)));
                } else if (event->motion.xrel < 0) {
                    event->motion.xrel = SDL_min(-1, (int)(event->motion.xrel / (scale.x * renderer->dpi_scale.x)));
                }
                if (event->motion.yrel > 0) {
                    event->motion.yrel = SDL_max(1, (int)(event->motion.yrel / (scale.y * renderer->dpi_scale.y)));
                } else if (event->motion.yrel < 0) {
                    event->motion.yrel = SDL_min(-1, (int)(event->motion.yrel / (scale.y * renderer->dpi_scale.y)));
                }
            }
        }
    } else if (event->type == SDL_MOUSEBUTTONDOWN ||
               event->type == SDL_MOUSEBUTTONUP) {
        SDL_Window *window = SDL_GetWindowFromID(event->button.windowID);
        if (window == renderer->window) {
            int logical_w, logical_h;
            SDL_Rect viewport;
            SDL_FPoint scale;
            GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
            if (logical_w) {
                event->button.x -= (int)(viewport.x * renderer->dpi_scale.x);
                event->button.y -= (int)(viewport.y * renderer->dpi_scale.y);
                event->button.x = (int)(event->button.x / (scale.x * renderer->dpi_scale.x));
                event->button.y = (int)(event->button.y / (scale.y * renderer->dpi_scale.y));
            }
        }
    } else if (event->type == SDL_FINGERDOWN ||
               event->type == SDL_FINGERUP ||
               event->type == SDL_FINGERMOTION) {
        int logical_w, logical_h;
        SDL_Rect viewport;
        SDL_FPoint scale;
        GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
        if (logical_w) {
            int w = 1;
            int h = 1;
            SDL_GetRendererOutputSize(renderer, &w, &h);

            event->tfinger.x *= (w - 1);
            event->tfinger.y *= (h - 1);

            event->tfinger.x -= (viewport.x * renderer->dpi_scale.x);
            event->tfinger.y -= (viewport.y * renderer->dpi_scale.y);
            event->tfinger.x = (event->tfinger.x / (scale.x * renderer->dpi_scale.x));
            event->tfinger.y = (event->tfinger.y / (scale.y * renderer->dpi_scale.y));

            if (logical_w > 1) {
                event->tfinger.x = event->tfinger.x / (logical_w - 1);
            } else {
                event->tfinger.x = 0.5f;
            }
            if (logical_h > 1) {
                event->tfinger.y = event->tfinger.y / (logical_h - 1);
            } else {
                event->tfinger.y = 0.5f;
            }
        }
    }

    return 0;
}

int SDL_RenderFillRect	(	SDL_Renderer *	renderer,
		const SDL_Rect *	rect
	)

Fill a rectangle on the current rendering target with the drawing color.

Parameters

renderer	The renderer which should fill a rectangle.
rect	A pointer to the destination rectangle, or NULL for the entire rendering target.

Returns

0 on success, or -1 on error

Definition at line 1859 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_RenderFillRects, SDL_RenderGetViewport, SDL_Rect::x, and SDL_Rect::y.

{
    SDL_Rect full_rect = { 0, 0, 0, 0 };

    CHECK_RENDERER_MAGIC(renderer, -1);

    /* If 'rect' == NULL, then outline the whole surface */
    if (!rect) {
        SDL_RenderGetViewport(renderer, &full_rect);
        full_rect.x = 0;
        full_rect.y = 0;
        rect = &full_rect;
    }
    return SDL_RenderFillRects(renderer, rect, 1);
}

int SDL_RenderFillRects	(	SDL_Renderer *	renderer,
		const SDL_Rect *	rects,
		int	count
	)

Fill some number of rectangles on the current rendering target with the drawing color.

Parameters

renderer	The renderer which should fill multiple rectangles.
rects	A pointer to an array of destination rectangles.
count	The number of rectangles.

Returns

0 on success, or -1 on error

Definition at line 1876 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_FRect::h, SDL_Rect::h, SDL_Renderer::hidden, i, SDL_Renderer::RenderFillRects, SDL_Renderer::scale, SDL_OutOfMemory, SDL_SetError, SDL_stack_alloc, SDL_stack_free, SDL_FRect::w, SDL_Rect::w, SDL_FPoint::x, SDL_FRect::x, SDL_Rect::x, SDL_FPoint::y, SDL_FRect::y, and SDL_Rect::y.

{
    SDL_FRect *frects;
    int i;
    int status;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!rects) {
        return SDL_SetError("SDL_RenderFillRects(): Passed NULL rects");
    }
    if (count < 1) {
        return 0;
    }

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }

    frects = SDL_stack_alloc(SDL_FRect, count);
    if (!frects) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        frects[i].x = rects[i].x * renderer->scale.x;
        frects[i].y = rects[i].y * renderer->scale.y;
        frects[i].w = rects[i].w * renderer->scale.x;
        frects[i].h = rects[i].h * renderer->scale.y;
    }

    status = renderer->RenderFillRects(renderer, frects, count);

    SDL_stack_free(frects);

    return status;
}

void SDL_RenderGetClipRect	(	SDL_Renderer *	renderer,
		SDL_Rect *	rect
	)

Get the clip rectangle for the current target.

Parameters

renderer	The renderer from which clip rectangle should be queried.
rect	A pointer filled in with the current clip rectangle, or an empty rectangle if clipping is disabled.

See Also

SDL_RenderSetClipRect()

Definition at line 1504 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::clip_rect, SDL_Rect::h, SDL_Renderer::scale, SDL_Rect::w, SDL_FPoint::x, SDL_Rect::x, SDL_FPoint::y, and SDL_Rect::y.

{
    CHECK_RENDERER_MAGIC(renderer, )

    if (rect) {
        rect->x = (int)(renderer->clip_rect.x / renderer->scale.x);
        rect->y = (int)(renderer->clip_rect.y / renderer->scale.y);
        rect->w = (int)(renderer->clip_rect.w / renderer->scale.x);
        rect->h = (int)(renderer->clip_rect.h / renderer->scale.y);
    }
}

SDL_bool SDL_RenderGetIntegerScale

(

SDL_Renderer *

renderer

)

Get whether integer scales are forced for resolution-independent rendering.

Parameters

renderer

The renderer from which integer scaling should be queried.

See Also

SDL_RenderSetIntegerScale()

Definition at line 1445 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::integer_scale, and SDL_FALSE.

{
    CHECK_RENDERER_MAGIC(renderer, SDL_FALSE);

    return renderer->integer_scale;
}

void SDL_RenderGetLogicalSize	(	SDL_Renderer *	renderer,
		int *	w,
		int *	h
	)

Get device independent resolution for rendering.

Parameters

renderer	The renderer from which resolution should be queried.
w	A pointer filled with the width of the logical resolution
h	A pointer filled with the height of the logical resolution

See Also

SDL_RenderSetLogicalSize()

Definition at line 1422 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::logical_h, and SDL_Renderer::logical_w.

{
    CHECK_RENDERER_MAGIC(renderer, );

    if (w) {
        *w = renderer->logical_w;
    }
    if (h) {
        *h = renderer->logical_h;
    }
}

void* SDL_RenderGetMetalCommandEncoder

(

SDL_Renderer *

renderer

)

Get the Metal command encoder for the current frame.

Parameters

renderer

The renderer to query

Returns

id<MTLRenderCommandEncoder> on success, or NULL if the renderer isn't a Metal renderer

See Also

SDL_RenderGetMetalLayer()

Definition at line 2194 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::GetMetalCommandEncoder, and NULL.

{
    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (renderer->GetMetalCommandEncoder) {
        return renderer->GetMetalCommandEncoder(renderer);
    }
    return NULL;
}

void* SDL_RenderGetMetalLayer

(

SDL_Renderer *

renderer

)

Get the CAMetalLayer associated with the given Metal renderer.

Parameters

renderer

The renderer to query

Returns

CAMetalLayer* on success, or NULL if the renderer isn't a Metal renderer

See Also

SDL_RenderGetMetalCommandEncoder()

Definition at line 2183 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::GetMetalLayer, and NULL.

{
    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (renderer->GetMetalLayer) {
        return renderer->GetMetalLayer(renderer);
    }
    return NULL;
}

void SDL_RenderGetScale	(	SDL_Renderer *	renderer,
		float *	scaleX,
		float *	scaleY
	)

Get the drawing scale for the current target.

Parameters

renderer	The renderer from which drawing scale should be queried.
scaleX	A pointer filled in with the horizontal scaling factor
scaleY	A pointer filled in with the vertical scaling factor

See Also

SDL_RenderSetScale()

Definition at line 1534 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::scale, SDL_FPoint::x, and SDL_FPoint::y.

{
    CHECK_RENDERER_MAGIC(renderer, );

    if (scaleX) {
        *scaleX = renderer->scale.x;
    }
    if (scaleY) {
        *scaleY = renderer->scale.y;
    }
}

void SDL_RenderGetViewport	(	SDL_Renderer *	renderer,
		SDL_Rect *	rect
	)

Get the drawing area for the current target.

See Also

SDL_RenderSetViewport()

Definition at line 1473 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Rect::h, SDL_Renderer::scale, SDL_Renderer::viewport, SDL_Rect::w, SDL_FPoint::x, SDL_Rect::x, SDL_FPoint::y, and SDL_Rect::y.

{
    CHECK_RENDERER_MAGIC(renderer, );

    if (rect) {
        rect->x = (int)(renderer->viewport.x / renderer->scale.x);
        rect->y = (int)(renderer->viewport.y / renderer->scale.y);
        rect->w = (int)(renderer->viewport.w / renderer->scale.x);
        rect->h = (int)(renderer->viewport.h / renderer->scale.y);
    }
}

SDL_bool SDL_RenderIsClipEnabled

(

SDL_Renderer *

renderer

)

Get whether clipping is enabled on the given renderer.

Parameters

renderer

The renderer from which clip state should be queried.

See Also

SDL_RenderGetClipRect()

Definition at line 1517 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::clipping_enabled, and SDL_FALSE.

{
    CHECK_RENDERER_MAGIC(renderer, SDL_FALSE)
    return renderer->clipping_enabled;
}

void SDL_RenderPresent

(

SDL_Renderer *

renderer

)

Update the screen with rendering performed.

Definition at line 2077 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::hidden, and SDL_Renderer::RenderPresent.

{
    CHECK_RENDERER_MAGIC(renderer, );

    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return;
    }
    renderer->RenderPresent(renderer);
}

int SDL_RenderReadPixels	(	SDL_Renderer *	renderer,
		const SDL_Rect *	rect,
		Uint32	format,
		void *	pixels,
		int	pitch
	)

Read pixels from the current rendering target.

Parameters

renderer	The renderer from which pixels should be read.
rect	A pointer to the rectangle to read, or NULL for the entire render target.
format	The desired format of the pixel data, or 0 to use the format of the rendering target
pixels	A pointer to be filled in with the pixel data
pitch	The pitch of the pixels parameter.

Returns

0 on success, or -1 if pixel reading is not supported.

Warning

This is a very slow operation, and should not be used frequently.

Definition at line 2040 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Rect::h, SDL_Renderer::RenderReadPixels, SDL_BYTESPERPIXEL, SDL_GetWindowPixelFormat, SDL_IntersectRect, SDL_Unsupported, SDL_Renderer::viewport, SDL_Rect::w, SDL_Renderer::window, SDL_Rect::x, and SDL_Rect::y.

{
    SDL_Rect real_rect;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!renderer->RenderReadPixels) {
        return SDL_Unsupported();
    }

    if (!format) {
        format = SDL_GetWindowPixelFormat(renderer->window);
    }

    real_rect.x = renderer->viewport.x;
    real_rect.y = renderer->viewport.y;
    real_rect.w = renderer->viewport.w;
    real_rect.h = renderer->viewport.h;
    if (rect) {
        if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
            return 0;
        }
        if (real_rect.y > rect->y) {
            pixels = (Uint8 *)pixels + pitch * (real_rect.y - rect->y);
        }
        if (real_rect.x > rect->x) {
            int bpp = SDL_BYTESPERPIXEL(format);
            pixels = (Uint8 *)pixels + bpp * (real_rect.x - rect->x);
        }
    }

    return renderer->RenderReadPixels(renderer, &real_rect,
                                      format, pixels, pitch);
}

int SDL_RenderSetClipRect	(	SDL_Renderer *	renderer,
		const SDL_Rect *	rect
	)

Set the clip rectangle for the current target.

Parameters

renderer	The renderer for which clip rectangle should be set.
rect	A pointer to the rectangle to set as the clip rectangle, or NULL to disable clipping.

Returns

0 on success, or -1 on error

See Also

SDL_RenderGetClipRect()

Definition at line 1486 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::clip_rect, SDL_Renderer::clipping_enabled, SDL_Rect::h, SDL_Renderer::scale, SDL_ceil, SDL_FALSE, SDL_floor, SDL_TRUE, SDL_zero, SDL_Renderer::UpdateClipRect, SDL_Rect::w, SDL_FPoint::x, SDL_Rect::x, SDL_FPoint::y, and SDL_Rect::y.

{
    CHECK_RENDERER_MAGIC(renderer, -1)

    if (rect) {
        renderer->clipping_enabled = SDL_TRUE;
        renderer->clip_rect.x = (int)SDL_floor(rect->x * renderer->scale.x);
        renderer->clip_rect.y = (int)SDL_floor(rect->y * renderer->scale.y);
        renderer->clip_rect.w = (int)SDL_ceil(rect->w * renderer->scale.x);
        renderer->clip_rect.h = (int)SDL_ceil(rect->h * renderer->scale.y);
    } else {
        renderer->clipping_enabled = SDL_FALSE;
        SDL_zero(renderer->clip_rect);
    }
    return renderer->UpdateClipRect(renderer);
}

int SDL_RenderSetIntegerScale	(	SDL_Renderer *	renderer,
		SDL_bool	enable
	)

Set whether to force integer scales for resolution-independent rendering.

Parameters

renderer	The renderer for which integer scaling should be set.
enable	Enable or disable integer scaling

This function restricts the logical viewport to integer values - that is, when a resolution is between two multiples of a logical size, the viewport size is rounded down to the lower multiple.

See Also

SDL_RenderSetLogicalSize()

Definition at line 1435 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::integer_scale, and UpdateLogicalSize().

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    renderer->integer_scale = enable;

    return UpdateLogicalSize(renderer);
}

int SDL_RenderSetLogicalSize	(	SDL_Renderer *	renderer,
		int	w,
		int	h
	)

Set device independent resolution for rendering.

Parameters

renderer	The renderer for which resolution should be set.
w	The width of the logical resolution
h	The height of the logical resolution

This function uses the viewport and scaling functionality to allow a fixed logical resolution for rendering, regardless of the actual output resolution. If the actual output resolution doesn't have the same aspect ratio the output rendering will be centered within the output display.

If the output display is a window, mouse events in the window will be filtered and scaled so they seem to arrive within the logical resolution.

Note

If this function results in scaling or subpixel drawing by the rendering backend, it will be handled using the appropriate quality hints.

See Also

SDL_RenderGetLogicalSize()

SDL_RenderSetScale()

SDL_RenderSetViewport()

Definition at line 1402 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::logical_h, SDL_Renderer::logical_w, NULL, SDL_RenderSetScale, SDL_RenderSetViewport, and UpdateLogicalSize().

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!w || !h) {
        /* Clear any previous logical resolution */
        renderer->logical_w = 0;
        renderer->logical_h = 0;
        SDL_RenderSetViewport(renderer, NULL);
        SDL_RenderSetScale(renderer, 1.0f, 1.0f);
        return 0;
    }

    renderer->logical_w = w;
    renderer->logical_h = h;

    return UpdateLogicalSize(renderer);
}

int SDL_RenderSetScale	(	SDL_Renderer *	renderer,
		float	scaleX,
		float	scaleY
	)

Set the drawing scale for rendering on the current target.

Parameters

renderer	The renderer for which the drawing scale should be set.
scaleX	The horizontal scaling factor
scaleY	The vertical scaling factor

The drawing coordinates are scaled by the x/y scaling factors before they are used by the renderer. This allows resolution independent drawing with a single coordinate system.

Note

If this results in scaling or subpixel drawing by the rendering backend, it will be handled using the appropriate quality hints. For best results use integer scaling factors.

See Also

SDL_RenderGetScale()

SDL_RenderSetLogicalSize()

Definition at line 1524 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Renderer::scale, SDL_FPoint::x, and SDL_FPoint::y.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    renderer->scale.x = scaleX;
    renderer->scale.y = scaleY;
    return 0;
}

int SDL_RenderSetViewport	(	SDL_Renderer *	renderer,
		const SDL_Rect *	rect
	)

Set the drawing area for rendering on the current target.

Parameters

renderer	The renderer for which the drawing area should be set.
rect	The rectangle representing the drawing area, or NULL to set the viewport to the entire target.

The x,y of the viewport rect represents the origin for rendering.

Returns

0 on success, or -1 on error

Note

If the window associated with the renderer is resized, the viewport is automatically reset.

See Also

SDL_RenderGetViewport()

SDL_RenderSetLogicalSize()

Definition at line 1453 of file SDL_render.c.

References CHECK_RENDERER_MAGIC, SDL_Rect::h, SDL_Renderer::scale, SDL_ceil, SDL_floor, SDL_GetRendererOutputSize, SDL_Renderer::UpdateViewport, SDL_Renderer::viewport, SDL_Rect::w, SDL_FPoint::x, SDL_Rect::x, SDL_FPoint::y, and SDL_Rect::y.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (rect) {
        renderer->viewport.x = (int)SDL_floor(rect->x * renderer->scale.x);
        renderer->viewport.y = (int)SDL_floor(rect->y * renderer->scale.y);
        renderer->viewport.w = (int)SDL_ceil(rect->w * renderer->scale.x);
        renderer->viewport.h = (int)SDL_ceil(rect->h * renderer->scale.y);
    } else {
        renderer->viewport.x = 0;
        renderer->viewport.y = 0;
        if (SDL_GetRendererOutputSize(renderer, &renderer->viewport.w, &renderer->viewport.h) < 0) {
            return -1;
        }
    }
    return renderer->UpdateViewport(renderer);
}

SDL_bool SDL_RenderTargetSupported

(

SDL_Renderer *

renderer

)

Determines whether a window supports the use of render targets.

Parameters

renderer

The renderer that will be checked

Returns

SDL_TRUE if supported, SDL_FALSE if not.

Definition at line 1201 of file SDL_render.c.

References SDL_RendererInfo::flags, SDL_Renderer::info, SDL_FALSE, SDL_RENDERER_TARGETTEXTURE, and SDL_Renderer::SetRenderTarget.

{
    if (!renderer || !renderer->SetRenderTarget) {
        return SDL_FALSE;
    }
    return (renderer->info.flags & SDL_RENDERER_TARGETTEXTURE) != 0;
}

int SDL_SetRenderDrawBlendMode	(	SDL_Renderer *	renderer,
		SDL_BlendMode	blendMode
	)

Set the blend mode used for drawing operations (Fill and Line).

Parameters

renderer	The renderer for which blend mode should be set.
blendMode	SDL_BlendMode to use for blending.

Returns

0 on success, or -1 on error

Note

If the blend mode is not supported, the closest supported mode is chosen.

See Also

SDL_GetRenderDrawBlendMode()

Definition at line 1581 of file SDL_render.c.

References blendMode, SDL_Renderer::blendMode, CHECK_RENDERER_MAGIC, IsSupportedBlendMode(), and SDL_Unsupported.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!IsSupportedBlendMode(renderer, blendMode)) {
        return SDL_Unsupported();
    }
    renderer->blendMode = blendMode;
    return 0;
}

int SDL_SetRenderDrawColor	(	SDL_Renderer *	renderer,
		Uint8	r,
		Uint8	g,
		Uint8	b,
		Uint8	a
	)

Set the color used for drawing operations (Rect, Line and Clear).

Parameters

renderer	The renderer for which drawing color should be set.
r	The red value used to draw on the rendering target.
g	The green value used to draw on the rendering target.
b	The blue value used to draw on the rendering target.
a	The alpha value used to draw on the rendering target, usually SDL_ALPHA_OPAQUE (255).

Returns

0 on success, or -1 on error

Definition at line 1547 of file SDL_render.c.

References SDL_Renderer::a, SDL_Renderer::b, CHECK_RENDERER_MAGIC, SDL_Renderer::g, and SDL_Renderer::r.

{
    CHECK_RENDERER_MAGIC(renderer, -1);

    renderer->r = r;
    renderer->g = g;
    renderer->b = b;
    renderer->a = a;
    return 0;
}

int SDL_SetRenderTarget	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

Set a texture as the current rendering target.

Parameters

renderer	The renderer.
texture	The targeted texture, which must be created with the SDL_TEXTUREACCESS_TARGET flag, or NULL for the default render target

Returns

0 on success, or -1 on error

See Also

SDL_GetRenderTarget()

Definition at line 1210 of file SDL_render.c.

References SDL_Texture::access, CHECK_TEXTURE_MAGIC, SDL_Renderer::clip_rect, SDL_Renderer::clip_rect_backup, SDL_Renderer::clipping_enabled, SDL_Renderer::clipping_enabled_backup, SDL_Texture::h, SDL_Rect::h, SDL_Renderer::logical_h, SDL_Renderer::logical_h_backup, SDL_Renderer::logical_w, SDL_Renderer::logical_w_backup, SDL_Texture::native, SDL_Texture::renderer, SDL_Renderer::scale, SDL_Renderer::scale_backup, SDL_FALSE, SDL_LockMutex, SDL_RenderTargetSupported, SDL_SetError, SDL_TEXTUREACCESS_TARGET, SDL_UnlockMutex, SDL_Unsupported, SDL_zero, SDL_Renderer::SetRenderTarget, SDL_Renderer::target, SDL_Renderer::target_mutex, SDL_Renderer::UpdateClipRect, SDL_Renderer::UpdateViewport, SDL_Renderer::viewport, SDL_Renderer::viewport_backup, SDL_Texture::w, SDL_Rect::w, SDL_FPoint::x, SDL_Rect::x, SDL_FPoint::y, and SDL_Rect::y.

{
    if (!SDL_RenderTargetSupported(renderer)) {
        return SDL_Unsupported();
    }
    if (texture == renderer->target) {
        /* Nothing to do! */
        return 0;
    }

    /* texture == NULL is valid and means reset the target to the window */
    if (texture) {
        CHECK_TEXTURE_MAGIC(texture, -1);
        if (renderer != texture->renderer) {
            return SDL_SetError("Texture was not created with this renderer");
        }
        if (texture->access != SDL_TEXTUREACCESS_TARGET) {
            return SDL_SetError("Texture not created with SDL_TEXTUREACCESS_TARGET");
        }
        if (texture->native) {
            /* Always render to the native texture */
            texture = texture->native;
        }
    }

    SDL_LockMutex(renderer->target_mutex);

    if (texture && !renderer->target) {
        /* Make a backup of the viewport */
        renderer->viewport_backup = renderer->viewport;
        renderer->clip_rect_backup = renderer->clip_rect;
        renderer->clipping_enabled_backup = renderer->clipping_enabled;
        renderer->scale_backup = renderer->scale;
        renderer->logical_w_backup = renderer->logical_w;
        renderer->logical_h_backup = renderer->logical_h;
    }
    renderer->target = texture;

    if (renderer->SetRenderTarget(renderer, texture) < 0) {
        SDL_UnlockMutex(renderer->target_mutex);
        return -1;
    }

    if (texture) {
        renderer->viewport.x = 0;
        renderer->viewport.y = 0;
        renderer->viewport.w = texture->w;
        renderer->viewport.h = texture->h;
        SDL_zero(renderer->clip_rect);
        renderer->clipping_enabled = SDL_FALSE;
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;
        renderer->logical_w = texture->w;
        renderer->logical_h = texture->h;
    } else {
        renderer->viewport = renderer->viewport_backup;
        renderer->clip_rect = renderer->clip_rect_backup;
        renderer->clipping_enabled = renderer->clipping_enabled_backup;
        renderer->scale = renderer->scale_backup;
        renderer->logical_w = renderer->logical_w_backup;
        renderer->logical_h = renderer->logical_h_backup;
    }

    SDL_UnlockMutex(renderer->target_mutex);

    if (renderer->UpdateViewport(renderer) < 0) {
        return -1;
    }
    if (renderer->UpdateClipRect(renderer) < 0) {
        return -1;
    }

    /* All set! */
    return 0;
}

int SDL_SetTextureAlphaMod	(	SDL_Texture *	texture,
		Uint8	alpha
	)

Set an additional alpha value used in render copy operations.

Parameters

texture	The texture to update.
alpha	The alpha value multiplied into copy operations.

Returns

0 on success, or -1 if the texture is not valid or alpha modulation is not supported.

See Also

SDL_GetTextureAlphaMod()

Definition at line 788 of file SDL_render.c.

References SDL_Texture::a, CHECK_TEXTURE_MAGIC, SDL_Texture::modMode, SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_SetTextureAlphaMod, SDL_TEXTUREMODULATE_ALPHA, and SDL_Renderer::SetTextureAlphaMod.

{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);

    renderer = texture->renderer;
    if (alpha < 255) {
        texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
    } else {
        texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
    }
    texture->a = alpha;
    if (texture->native) {
        return SDL_SetTextureAlphaMod(texture->native, alpha);
    } else if (renderer->SetTextureAlphaMod) {
        return renderer->SetTextureAlphaMod(renderer, texture);
    } else {
        return 0;
    }
}

int SDL_SetTextureBlendMode	(	SDL_Texture *	texture,
		SDL_BlendMode	blendMode
	)

Set the blend mode used for texture copy operations.

Parameters

texture	The texture to update.
blendMode	SDL_BlendMode to use for texture blending.

Returns

0 on success, or -1 if the texture is not valid or the blend mode is not supported.

Note

If the blend mode is not supported, the closest supported mode is chosen.

See Also

SDL_GetTextureBlendMode()

Definition at line 822 of file SDL_render.c.

References blendMode, SDL_Texture::blendMode, CHECK_TEXTURE_MAGIC, IsSupportedBlendMode(), SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_SetTextureBlendMode, SDL_Unsupported, and SDL_Renderer::SetTextureBlendMode.

{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);

    renderer = texture->renderer;
    if (!IsSupportedBlendMode(renderer, blendMode)) {
        return SDL_Unsupported();
    }
    texture->blendMode = blendMode;
    if (texture->native) {
        return SDL_SetTextureBlendMode(texture->native, blendMode);
    } else if (renderer->SetTextureBlendMode) {
        return renderer->SetTextureBlendMode(renderer, texture);
    } else {
        return 0;
    }
}

int SDL_SetTextureColorMod	(	SDL_Texture *	texture,
		Uint8	r,
		Uint8	g,
		Uint8	b
	)

Set an additional color value used in render copy operations.

Parameters

texture	The texture to update.
r	The red color value multiplied into copy operations.
g	The green color value multiplied into copy operations.
b	The blue color value multiplied into copy operations.

Returns

0 on success, or -1 if the texture is not valid or color modulation is not supported.

See Also

SDL_GetTextureColorMod()

Definition at line 745 of file SDL_render.c.

References SDL_Texture::b, CHECK_TEXTURE_MAGIC, SDL_Texture::g, SDL_Texture::modMode, SDL_Texture::native, SDL_Texture::r, renderer, SDL_Texture::renderer, SDL_SetTextureColorMod, SDL_TEXTUREMODULATE_COLOR, and SDL_Renderer::SetTextureColorMod.

{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);

    renderer = texture->renderer;
    if (r < 255 || g < 255 || b < 255) {
        texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
    } else {
        texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
    }
    texture->r = r;
    texture->g = g;
    texture->b = b;
    if (texture->native) {
        return SDL_SetTextureColorMod(texture->native, r, g, b);
    } else if (renderer->SetTextureColorMod) {
        return renderer->SetTextureColorMod(renderer, texture);
    } else {
        return 0;
    }
}

void SDL_UnlockTexture

(

SDL_Texture *

texture

)

Unlock a texture, uploading the changes to video memory, if needed.

See Also

SDL_LockTexture()

Definition at line 1181 of file SDL_render.c.

References SDL_Texture::access, CHECK_TEXTURE_MAGIC, SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_TEXTUREACCESS_STREAMING, SDL_UnlockTextureNative(), SDL_UnlockTextureYUV(), SDL_Renderer::UnlockTexture, and SDL_Texture::yuv.

{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, );

    if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
        return;
    }
    if (texture->yuv) {
        SDL_UnlockTextureYUV(texture);
    } else if (texture->native) {
        SDL_UnlockTextureNative(texture);
    } else {
        renderer = texture->renderer;
        renderer->UnlockTexture(renderer, texture);
    }
}

static void SDL_UnlockTextureNative ( SDL_Texture *  texture )

static

Definition at line 1160 of file SDL_render.c.

References SDL_Texture::format, SDL_Rect::h, SDL_Texture::locked_rect, SDL_Texture::native, NULL, SDL_Texture::pitch, SDL_Texture::pixels, rect, SDL_BYTESPERPIXEL, SDL_ConvertPixels, SDL_LockTexture, SDL_UnlockTexture, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_UnlockTexture().

{
    SDL_Texture *native = texture->native;
    void *native_pixels = NULL;
    int native_pitch = 0;
    const SDL_Rect *rect = &texture->locked_rect;
    const void* pixels = (void *) ((Uint8 *) texture->pixels +
                        rect->y * texture->pitch +
                        rect->x * SDL_BYTESPERPIXEL(texture->format));
    int pitch = texture->pitch;

    if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
        return;
    }
    SDL_ConvertPixels(rect->w, rect->h,
                      texture->format, pixels, pitch,
                      native->format, native_pixels, native_pitch);
    SDL_UnlockTexture(native);
}

static void SDL_UnlockTextureYUV ( SDL_Texture *  texture )

static

Definition at line 1139 of file SDL_render.c.

References SDL_Texture::format, SDL_Texture::h, SDL_Rect::h, SDL_Texture::native, NULL, rect, SDL_LockTexture, SDL_SW_CopyYUVToRGB(), SDL_UnlockTexture, SDL_Texture::w, SDL_Rect::w, SDL_Rect::x, SDL_Rect::y, and SDL_Texture::yuv.

Referenced by SDL_UnlockTexture().

{
    SDL_Texture *native = texture->native;
    void *native_pixels = NULL;
    int native_pitch = 0;
    SDL_Rect rect;

    rect.x = 0;
    rect.y = 0;
    rect.w = texture->w;
    rect.h = texture->h;

    if (SDL_LockTexture(native, &rect, &native_pixels, &native_pitch) < 0) {
        return;
    }
    SDL_SW_CopyYUVToRGB(texture->yuv, &rect, native->format,
                        rect.w, rect.h, native_pixels, native_pitch);
    SDL_UnlockTexture(native);
}

int SDL_UpdateTexture	(	SDL_Texture *	texture,
		const SDL_Rect *	rect,
		const void *	pixels,
		int	pitch
	)

Update the given texture rectangle with new pixel data.

Parameters

texture	The texture to update
rect	A pointer to the rectangle of pixels to update, or NULL to update the entire texture.
pixels	The raw pixel data in the format of the texture.
pitch	The number of bytes in a row of pixel data, including padding between lines.

The pixel data must be in the format of the texture. The pixel format can be queried with SDL_QueryTexture.

Returns

0 on success, or -1 if the texture is not valid.

Note

This is a fairly slow function.

Definition at line 941 of file SDL_render.c.

References CHECK_TEXTURE_MAGIC, SDL_Texture::h, SDL_Rect::h, SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_InvalidParamError, SDL_UpdateTextureNative(), SDL_UpdateTextureYUV(), SDL_Renderer::UpdateTexture, SDL_Texture::w, SDL_Rect::w, SDL_Rect::x, SDL_Rect::y, and SDL_Texture::yuv.

{
    SDL_Renderer *renderer;
    SDL_Rect full_rect;

    CHECK_TEXTURE_MAGIC(texture, -1);

    if (!pixels) {
        return SDL_InvalidParamError("pixels");
    }
    if (!pitch) {
        return SDL_InvalidParamError("pitch");
    }

    if (!rect) {
        full_rect.x = 0;
        full_rect.y = 0;
        full_rect.w = texture->w;
        full_rect.h = texture->h;
        rect = &full_rect;
    }

    if ((rect->w == 0) || (rect->h == 0)) {
        return 0;  /* nothing to do. */
    } else if (texture->yuv) {
        return SDL_UpdateTextureYUV(texture, rect, pixels, pitch);
    } else if (texture->native) {
        return SDL_UpdateTextureNative(texture, rect, pixels, pitch);
    } else {
        renderer = texture->renderer;
        return renderer->UpdateTexture(renderer, texture, rect, pixels, pitch);
    }
}

static int SDL_UpdateTextureNative ( SDL_Texture *  texture, const SDL_Rect *  rect, const void *  pixels, int  pitch  )

static

Definition at line 900 of file SDL_render.c.

References SDL_Texture::access, SDL_Texture::format, SDL_Rect::h, SDL_Texture::native, NULL, SDL_BYTESPERPIXEL, SDL_ConvertPixels, SDL_free, SDL_LockTexture, SDL_malloc, SDL_OutOfMemory, SDL_TEXTUREACCESS_STREAMING, SDL_UnlockTexture, SDL_UpdateTexture, and SDL_Rect::w.

Referenced by SDL_UpdateTexture().

{
    SDL_Texture *native = texture->native;

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
        }
        SDL_ConvertPixels(rect->w, rect->h,
                          texture->format, pixels, pitch,
                          native->format, native_pixels, native_pitch);
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_ConvertPixels(rect->w, rect->h,
                              texture->format, pixels, pitch,
                              native->format, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
    }
    return 0;
}

static int SDL_UpdateTextureYUV ( SDL_Texture *  texture, const SDL_Rect *  rect, const void *  pixels, int  pitch  )

static

Definition at line 854 of file SDL_render.c.

References SDL_Texture::access, SDL_Texture::format, SDL_Texture::h, SDL_Rect::h, SDL_Texture::native, NULL, SDL_BYTESPERPIXEL, SDL_free, SDL_LockTexture, SDL_malloc, SDL_OutOfMemory, SDL_SW_CopyYUVToRGB(), SDL_SW_UpdateYUVTexture(), SDL_TEXTUREACCESS_STREAMING, SDL_UnlockTexture, SDL_UpdateTexture, SDL_Texture::w, SDL_Rect::w, SDL_Rect::x, SDL_Rect::y, and SDL_Texture::yuv.

Referenced by SDL_UpdateTexture().

{
    SDL_Texture *native = texture->native;
    SDL_Rect full_rect;

    if (SDL_SW_UpdateYUVTexture(texture->yuv, rect, pixels, pitch) < 0) {
        return -1;
    }

    full_rect.x = 0;
    full_rect.y = 0;
    full_rect.w = texture->w;
    full_rect.h = texture->h;
    rect = &full_rect;

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
        }
        SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                            rect->w, rect->h, native_pixels, native_pitch);
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                                rect->w, rect->h, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
    }
    return 0;
}

static int SDL_UpdateTextureYUVPlanar ( SDL_Texture *  texture, const SDL_Rect *  rect, const Uint8 *  Yplane, int  Ypitch, const Uint8 *  Uplane, int  Upitch, const Uint8 *  Vplane, int  Vpitch  )

static

Definition at line 977 of file SDL_render.c.

References SDL_Texture::access, SDL_Texture::format, SDL_Texture::h, SDL_Rect::h, SDL_Texture::native, NULL, SDL_BYTESPERPIXEL, SDL_free, SDL_LockTexture, SDL_malloc, SDL_OutOfMemory, SDL_SW_CopyYUVToRGB(), SDL_SW_UpdateYUVTexturePlanar(), SDL_TEXTUREACCESS_STREAMING, SDL_UnlockTexture, SDL_UpdateTexture, SDL_Texture::w, SDL_Rect::w, SDL_Rect::x, SDL_Rect::y, and SDL_Texture::yuv.

Referenced by SDL_UpdateYUVTexture().

{
    SDL_Texture *native = texture->native;
    SDL_Rect full_rect;

    if (SDL_SW_UpdateYUVTexturePlanar(texture->yuv, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch) < 0) {
        return -1;
    }

    full_rect.x = 0;
    full_rect.y = 0;
    full_rect.w = texture->w;
    full_rect.h = texture->h;
    rect = &full_rect;

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
        }
        SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                            rect->w, rect->h, native_pixels, native_pitch);
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                                rect->w, rect->h, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
    }
    return 0;
}

int SDL_UpdateYUVTexture	(	SDL_Texture *	texture,
		const SDL_Rect *	rect,
		const Uint8 *	Yplane,
		int	Ypitch,
		const Uint8 *	Uplane,
		int	Upitch,
		const Uint8 *	Vplane,
		int	Vpitch
	)

Update a rectangle within a planar YV12 or IYUV texture with new pixel data.

Parameters

texture	The texture to update
rect	A pointer to the rectangle of pixels to update, or NULL to update the entire texture.
Yplane	The raw pixel data for the Y plane.
Ypitch	The number of bytes between rows of pixel data for the Y plane.
Uplane	The raw pixel data for the U plane.
Upitch	The number of bytes between rows of pixel data for the U plane.
Vplane	The raw pixel data for the V plane.
Vpitch	The number of bytes between rows of pixel data for the V plane.

Returns

0 on success, or -1 if the texture is not valid.

Note

You can use SDL_UpdateTexture() as long as your pixel data is a contiguous block of Y and U/V planes in the proper order, but this function is available if your pixel data is not contiguous.

Definition at line 1028 of file SDL_render.c.

References CHECK_TEXTURE_MAGIC, SDL_Texture::format, SDL_Texture::h, SDL_Rect::h, SDL_Texture::native, renderer, SDL_Texture::renderer, SDL_assert, SDL_InvalidParamError, SDL_PIXELFORMAT_IYUV, SDL_PIXELFORMAT_YV12, SDL_SetError, SDL_Unsupported, SDL_UpdateTextureYUVPlanar(), SDL_Renderer::UpdateTextureYUV, SDL_Texture::w, SDL_Rect::w, SDL_Rect::x, SDL_Rect::y, and SDL_Texture::yuv.

{
    SDL_Renderer *renderer;
    SDL_Rect full_rect;

    CHECK_TEXTURE_MAGIC(texture, -1);

    if (!Yplane) {
        return SDL_InvalidParamError("Yplane");
    }
    if (!Ypitch) {
        return SDL_InvalidParamError("Ypitch");
    }
    if (!Uplane) {
        return SDL_InvalidParamError("Uplane");
    }
    if (!Upitch) {
        return SDL_InvalidParamError("Upitch");
    }
    if (!Vplane) {
        return SDL_InvalidParamError("Vplane");
    }
    if (!Vpitch) {
        return SDL_InvalidParamError("Vpitch");
    }

    if (texture->format != SDL_PIXELFORMAT_YV12 &&
        texture->format != SDL_PIXELFORMAT_IYUV) {
        return SDL_SetError("Texture format must by YV12 or IYUV");
    }

    if (!rect) {
        full_rect.x = 0;
        full_rect.y = 0;
        full_rect.w = texture->w;
        full_rect.h = texture->h;
        rect = &full_rect;
    }

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->yuv) {
        return SDL_UpdateTextureYUVPlanar(texture, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
    } else {
        SDL_assert(!texture->native);
        renderer = texture->renderer;
        SDL_assert(renderer->UpdateTextureYUV);
        if (renderer->UpdateTextureYUV) {
            return renderer->UpdateTextureYUV(renderer, texture, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
        } else {
            return SDL_Unsupported();
        }
    }
}

static int UpdateLogicalSize ( SDL_Renderer *  renderer )

static

Definition at line 1293 of file SDL_render.c.

References SDL_Rect::h, SDL_Renderer::integer_scale, SDL_Renderer::logical_h, SDL_Renderer::logical_w, NULL, SDL_ceil, SDL_fabs, SDL_FALSE, SDL_GetCurrentVideoDriver, SDL_GetHint, SDL_GetRendererOutputSize, SDL_HINT_RENDER_LOGICAL_SIZE_MODE, SDL_RenderSetScale, SDL_RenderSetViewport, SDL_strcasecmp, SDL_TRUE, viewport, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SDL_RendererEventWatch(), SDL_RenderSetIntegerScale(), and SDL_RenderSetLogicalSize().

{
    int w = 1, h = 1;
    float want_aspect;
    float real_aspect;
    float scale;
    SDL_Rect viewport;
    /* 0 is for letterbox, 1 is for overscan */
    int scale_policy = 0;
    const char *hint;

    if (!renderer->logical_w || !renderer->logical_h) {
        return 0;
    }
    if (SDL_GetRendererOutputSize(renderer, &w, &h) < 0) {
        return -1;
    }

    hint = SDL_GetHint(SDL_HINT_RENDER_LOGICAL_SIZE_MODE);
    if (hint && (*hint == '1' || SDL_strcasecmp(hint, "overscan") == 0))  {
#if SDL_VIDEO_RENDER_D3D
        SDL_bool overscan_supported = SDL_TRUE;
        /* Unfortunately, Direct3D 9 doesn't support negative viewport numbers
           which the overscan implementation relies on.
        */
        if (SDL_strcasecmp(SDL_GetCurrentVideoDriver(), "direct3d") == 0) {
            overscan_supported = SDL_FALSE;
        }
        if (overscan_supported) {
            scale_policy = 1;
        }
#else
        scale_policy = 1;
#endif
    }

    want_aspect = (float)renderer->logical_w / renderer->logical_h;
    real_aspect = (float)w / h;

    /* Clear the scale because we're setting viewport in output coordinates */
    SDL_RenderSetScale(renderer, 1.0f, 1.0f);

    if (renderer->integer_scale) {
        if (want_aspect > real_aspect) {
            scale = (float)(w / renderer->logical_w);
        } else {
            scale = (float)(h / renderer->logical_h);
        }
        viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
        viewport.x = (w - viewport.w) / 2;
        viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
        viewport.y = (h - viewport.h) / 2;

        SDL_RenderSetViewport(renderer, &viewport);
    } else if (SDL_fabs(want_aspect-real_aspect) < 0.0001) {
        /* The aspect ratios are the same, just scale appropriately */
        scale = (float)w / renderer->logical_w;
        SDL_RenderSetViewport(renderer, NULL);
    } else if (want_aspect > real_aspect) {
        if (scale_policy == 1) {
            /* We want a wider aspect ratio than is available - 
             zoom so logical height matches the real height 
             and the width will grow off the screen 
             */
            scale = (float)h / renderer->logical_h;
            viewport.y = 0;
            viewport.h = h;
            viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
            viewport.x = (w - viewport.w) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        } else {
            /* We want a wider aspect ratio than is available - letterbox it */
            scale = (float)w / renderer->logical_w;
            viewport.x = 0;
            viewport.w = w;
            viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
            viewport.y = (h - viewport.h) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        }
    } else {
        if (scale_policy == 1) {
            /* We want a narrower aspect ratio than is available -
             zoom so logical width matches the real width
             and the height will grow off the screen
             */
            scale = (float)w / renderer->logical_w;
            viewport.x = 0;
            viewport.w = w;
            viewport.h = (int)SDL_ceil(renderer->logical_h * scale);
            viewport.y = (h - viewport.h) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        } else {
            /* We want a narrower aspect ratio than is available - use side-bars */
             scale = (float)h / renderer->logical_h;
             viewport.y = 0;
             viewport.h = h;
             viewport.w = (int)SDL_ceil(renderer->logical_w * scale);
             viewport.x = (w - viewport.w) / 2;
             SDL_RenderSetViewport(renderer, &viewport);
        }
    }

    /* Set the new scale */
    SDL_RenderSetScale(renderer, scale, scale);

    return 0;
}

Variable Documentation

const SDL_RenderDriver* render_drivers[]

static

Initial value:

 {
























    &SW_RenderDriver
}

Definition at line 76 of file SDL_render.c.

char renderer_magic

static

Definition at line 105 of file SDL_render.c.

Referenced by SDL_CreateRenderer(), and SDL_CreateSoftwareRenderer().

char texture_magic

static

Definition at line 106 of file SDL_render.c.

Referenced by SDL_CreateTexture().