#include "../../SDL_internal.h"
#include "../SDL_sysrender.h"
#include "SDL_render_sw_c.h"
#include "SDL_hints.h"
#include "SDL_draw.h"
#include "SDL_blendfillrect.h"
#include "SDL_blendline.h"
#include "SDL_blendpoint.h"
#include "SDL_drawline.h"
#include "SDL_drawpoint.h"
#include "SDL_rotate.h"

Include dependency graph for SDL_render_sw.c:

Data Structures
struct	SW_RenderData

Functions
static SDL_Renderer *	SW_CreateRenderer (SDL_Window *window, Uint32 flags)
static void	SW_WindowEvent (SDL_Renderer renderer, const SDL_WindowEvent event)
static int	SW_GetOutputSize (SDL_Renderer renderer, int w, int *h)
static int	SW_CreateTexture (SDL_Renderer renderer, SDL_Texture texture)
static int	SW_SetTextureColorMod (SDL_Renderer renderer, SDL_Texture texture)
static int	SW_SetTextureAlphaMod (SDL_Renderer renderer, SDL_Texture texture)
static int	SW_SetTextureBlendMode (SDL_Renderer renderer, SDL_Texture texture)
static int	SW_UpdateTexture (SDL_Renderer renderer, SDL_Texture texture, const SDL_Rect rect, const void pixels, int pitch)
static int	SW_LockTexture (SDL_Renderer renderer, SDL_Texture texture, const SDL_Rect rect, void pixels, int pitch)
static void	SW_UnlockTexture (SDL_Renderer renderer, SDL_Texture texture)
static int	SW_SetRenderTarget (SDL_Renderer renderer, SDL_Texture texture)
static int	SW_UpdateViewport (SDL_Renderer *renderer)
static int	SW_UpdateClipRect (SDL_Renderer *renderer)
static int	SW_RenderClear (SDL_Renderer *renderer)
static int	SW_RenderDrawPoints (SDL_Renderer renderer, const SDL_FPoint points, int count)
static int	SW_RenderDrawLines (SDL_Renderer renderer, const SDL_FPoint points, int count)
static int	SW_RenderFillRects (SDL_Renderer renderer, const SDL_FRect rects, int count)
static int	SW_RenderCopy (SDL_Renderer renderer, SDL_Texture texture, const SDL_Rect srcrect, const SDL_FRect dstrect)
static int	SW_RenderCopyEx (SDL_Renderer renderer, SDL_Texture texture, const SDL_Rect srcrect, const SDL_FRect dstrect, const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
static int	SW_RenderReadPixels (SDL_Renderer renderer, const SDL_Rect rect, Uint32 format, void *pixels, int pitch)
static void	SW_RenderPresent (SDL_Renderer *renderer)
static void	SW_DestroyTexture (SDL_Renderer renderer, SDL_Texture texture)
static void	SW_DestroyRenderer (SDL_Renderer *renderer)
static SDL_Surface *	SW_ActivateRenderer (SDL_Renderer *renderer)
SDL_Renderer *	SW_CreateRendererForSurface (SDL_Surface *surface)

Variables
SDL_RenderDriver	SW_RenderDriver

Function Documentation

static SDL_Surface* SW_ActivateRenderer ( SDL_Renderer * renderer )

static

Definition at line 106 of file SDL_render_sw.c.

References SDL_Renderer::driverdata, SDL_GetWindowSurface, SW_RenderData::surface, SW_UpdateClipRect(), SW_UpdateViewport(), SW_RenderData::window, and SDL_Renderer::window.

Referenced by SW_CreateRendererForSurface(), SW_GetOutputSize(), SW_RenderClear(), SW_RenderCopy(), SW_RenderCopyEx(), SW_RenderDrawLines(), SW_RenderDrawPoints(), SW_RenderFillRects(), and SW_RenderReadPixels().

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    if (!data->surface) {
        data->surface = data->window;
    }
    if (!data->surface) {
        SDL_Surface *surface = SDL_GetWindowSurface(renderer->window);
        if (surface) {
            data->surface = data->window = surface;
            SW_UpdateViewport(renderer);
            SW_UpdateClipRect(renderer);
        }
    }
    return data->surface;
}

SDL_Renderer * SW_CreateRenderer	(	SDL_Window *	window,
		Uint32	flags
	)

static

Definition at line 182 of file SDL_render_sw.c.

References NULL, SDL_GetWindowSurface, and SW_CreateRendererForSurface().

{
    SDL_Surface *surface;
    surface = SDL_GetWindowSurface(window);
    if (!surface) {
        return NULL;
    }
    return SW_CreateRendererForSurface(surface);
}

SDL_Renderer* SW_CreateRendererForSurface ( SDL_Surface * surface )

Definition at line 126 of file SDL_render_sw.c.

Referenced by SDL_CreateSoftwareRenderer(), and SW_CreateRenderer().

{
    SDL_Renderer *renderer;
    SW_RenderData *data;
    if (!surface) {
        SDL_SetError("Can't create renderer for NULL surface");
        return NULL;
    }
    renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
    if (!renderer) {
        SDL_OutOfMemory();
        return NULL;
    }
    data = (SW_RenderData *) SDL_calloc(1, sizeof(*data));
    if (!data) {
        SW_DestroyRenderer(renderer);
        SDL_OutOfMemory();
        return NULL;
    }
    data->surface = surface;
    data->window = surface;
    renderer->WindowEvent = SW_WindowEvent;
    renderer->GetOutputSize = SW_GetOutputSize;
    renderer->CreateTexture = SW_CreateTexture;
    renderer->SetTextureColorMod = SW_SetTextureColorMod;
    renderer->SetTextureAlphaMod = SW_SetTextureAlphaMod;
    renderer->SetTextureBlendMode = SW_SetTextureBlendMode;
    renderer->UpdateTexture = SW_UpdateTexture;
    renderer->LockTexture = SW_LockTexture;
    renderer->UnlockTexture = SW_UnlockTexture;
    renderer->SetRenderTarget = SW_SetRenderTarget;
    renderer->UpdateViewport = SW_UpdateViewport;
    renderer->UpdateClipRect = SW_UpdateClipRect;
    renderer->RenderClear = SW_RenderClear;
    renderer->RenderDrawPoints = SW_RenderDrawPoints;
    renderer->RenderDrawLines = SW_RenderDrawLines;
    renderer->RenderFillRects = SW_RenderFillRects;
    renderer->RenderCopy = SW_RenderCopy;
    renderer->RenderCopyEx = SW_RenderCopyEx;
    renderer->RenderReadPixels = SW_RenderReadPixels;
    renderer->RenderPresent = SW_RenderPresent;
    renderer->DestroyTexture = SW_DestroyTexture;
    renderer->DestroyRenderer = SW_DestroyRenderer;
    renderer->info = SW_RenderDriver.info;
    renderer->driverdata = data;
    SW_ActivateRenderer(renderer);
    return renderer;
}

static int SW_CreateTexture	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

static

Definition at line 224 of file SDL_render_sw.c.

References SDL_Texture::a, SDL_Texture::access, SDL_Texture::b, SDL_Texture::blendMode, SDL_Texture::driverdata, SDL_Texture::format, SDL_Texture::g, SDL_Texture::h, SDL_Texture::r, SDL_CreateRGBSurface, SDL_PixelFormatEnumToMasks, SDL_SetError, SDL_SetSurfaceAlphaMod, SDL_SetSurfaceBlendMode, SDL_SetSurfaceColorMod, SDL_SetSurfaceRLE, SDL_TEXTUREACCESS_STATIC, and SDL_Texture::w.

Referenced by SW_CreateRendererForSurface().

{
    int bpp;
    Uint32 Rmask, Gmask, Bmask, Amask;
    if (!SDL_PixelFormatEnumToMasks
        (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
        return SDL_SetError("Unknown texture format");
    }
    texture->driverdata =
        SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
                             Bmask, Amask);
    SDL_SetSurfaceColorMod(texture->driverdata, texture->r, texture->g,
                           texture->b);
    SDL_SetSurfaceAlphaMod(texture->driverdata, texture->a);
    SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode);
    /* Only RLE encode textures without an alpha channel since the RLE coder
     * discards the color values of pixels with an alpha value of zero.
     */
    if (texture->access == SDL_TEXTUREACCESS_STATIC && !Amask) {
        SDL_SetSurfaceRLE(texture->driverdata, 1);
    }
    if (!texture->driverdata) {
        return -1;
    }
    return 0;
}

static void SW_DestroyRenderer ( SDL_Renderer * renderer )

static

Definition at line 877 of file SDL_render_sw.c.

References SDL_Renderer::driverdata, and SDL_free.

Referenced by SW_CreateRendererForSurface().

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_free(data);
    SDL_free(renderer);
}

static void SW_DestroyTexture	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

static

Definition at line 869 of file SDL_render_sw.c.

References SDL_Texture::driverdata, and SDL_FreeSurface.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    SDL_FreeSurface(surface);
}

static int SW_GetOutputSize	(	SDL_Renderer *	renderer,
		int *	w,
		int *	h
	)

static

Definition at line 205 of file SDL_render_sw.c.

References SDL_Surface::h, SDL_SetError, SW_ActivateRenderer(), and SDL_Surface::w.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    if (surface) {
        if (w) {
            *w = surface->w;
        }
        if (h) {
            *h = surface->h;
        }
        return 0;
    } else {
        SDL_SetError("Software renderer doesn't have an output surface");
        return -1;
    }
}

static int SW_LockTexture	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture,
		const SDL_Rect *	rect,
		void **	pixels,
		int *	pitch
	)

static

Definition at line 322 of file SDL_render_sw.c.

References SDL_PixelFormat::BytesPerPixel, SDL_Texture::driverdata, SDL_Surface::format, SDL_Surface::pitch, SDL_Surface::pixels, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    *pixels =
        (void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
                  rect->x * surface->format->BytesPerPixel);
    *pitch = surface->pitch;
    return 0;
}

static int SW_RenderClear ( SDL_Renderer * renderer )

static

Definition at line 388 of file SDL_render_sw.c.

References SDL_Renderer::a, SDL_Renderer::b, SDL_Surface::clip_rect, SDL_Surface::format, SDL_Renderer::g, NULL, SDL_Renderer::r, SDL_FillRect, SDL_MapRGBA, SDL_SetClipRect, and SW_ActivateRenderer().

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    Uint32 color;
    SDL_Rect clip_rect;
    if (!surface) {
        return -1;
    }
    color = SDL_MapRGBA(surface->format,
                        renderer->r, renderer->g, renderer->b, renderer->a);
    /* By definition the clear ignores the clip rect */
    clip_rect = surface->clip_rect;
    SDL_SetClipRect(surface, NULL);
    SDL_FillRect(surface, NULL, color);
    SDL_SetClipRect(surface, &clip_rect);
    return 0;
}

static int SW_RenderCopy	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture,
		const SDL_Rect *	srcrect,
		const SDL_FRect *	dstrect
	)

static

Definition at line 558 of file SDL_render_sw.c.

References SDL_Texture::driverdata, SDL_FRect::h, SDL_Rect::h, SDL_BlitScaled, SDL_BlitSurface, SDL_SetSurfaceRLE, SW_ActivateRenderer(), SDL_Renderer::viewport, SDL_FRect::w, SDL_Rect::w, SDL_FRect::x, SDL_Rect::x, SDL_FRect::y, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    SDL_Surface *src = (SDL_Surface *) texture->driverdata;
    SDL_Rect final_rect;
    if (!surface) {
        return -1;
    }
    if (renderer->viewport.x || renderer->viewport.y) {
        final_rect.x = (int)(renderer->viewport.x + dstrect->x);
        final_rect.y = (int)(renderer->viewport.y + dstrect->y);
    } else {
        final_rect.x = (int)dstrect->x;
        final_rect.y = (int)dstrect->y;
    }
    final_rect.w = (int)dstrect->w;
    final_rect.h = (int)dstrect->h;
    if ( srcrect->w == final_rect.w && srcrect->h == final_rect.h ) {
        return SDL_BlitSurface(src, srcrect, surface, &final_rect);
    } else {
        /* If scaling is ever done, permanently disable RLE (which doesn't support scaling)
         * to avoid potentially frequent RLE encoding/decoding.
         */
        SDL_SetSurfaceRLE(surface, 0);
        return SDL_BlitScaled(src, srcrect, surface, &final_rect);
    }
}

static int SW_RenderCopyEx	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture,
		const SDL_Rect *	srcrect,
		const SDL_FRect *	dstrect,
		const double	angle,
		const SDL_FPoint *	center,
		const SDL_RendererFlip	flip
	)

static

Definition at line 591 of file SDL_render_sw.c.

References SDL_PixelFormat::Amask, SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::Bmask, SDL_Texture::driverdata, SDL_Surface::format, SDL_PixelFormat::format, SDL_PixelFormat::Gmask, SDL_FRect::h, SDL_Rect::h, SDL_Surface::h, MIN, NULL, SDL_Surface::pitch, SDL_Surface::pixels, retval, SDL_PixelFormat::Rmask, SDL_Texture::scaleMode, SDL_BLENDMODE_ADD, SDL_BLENDMODE_MOD, SDL_BLENDMODE_NONE, SDL_BlitScaled, SDL_BlitSurface, SDL_CreateRGBSurface, SDL_CreateRGBSurfaceFrom, SDL_FALSE, SDL_FLIP_HORIZONTAL, SDL_FLIP_VERTICAL, SDL_FreeSurface, SDL_GetSurfaceAlphaMod, SDL_GetSurfaceBlendMode, SDL_GetSurfaceColorMod, SDL_LockSurface, SDL_MUSTLOCK, SDL_PACKEDLAYOUT_8888, SDL_PIXELLAYOUT, SDL_ScaleModeNearest, SDL_SetSurfaceAlphaMod, SDL_SetSurfaceBlendMode, SDL_SetSurfaceColorMod, SDL_TRUE, SDL_UnlockSurface, SDLgfx_rotateSurface(), SDLgfx_rotozoomSurfaceSizeTrig(), SW_ActivateRenderer(), SDL_Renderer::viewport, SDL_FRect::w, SDL_Rect::w, SDL_Surface::w, SDL_FPoint::x, SDL_FRect::x, SDL_Rect::x, SDL_FPoint::y, SDL_FRect::y, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    SDL_Surface *src = (SDL_Surface *) texture->driverdata;
    SDL_Rect final_rect, tmp_rect;
    SDL_Surface *src_clone, *src_rotated, *src_scaled;
    SDL_Surface *mask = NULL, *mask_rotated = NULL;
    int retval = 0, dstwidth, dstheight, abscenterx, abscentery;
    double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
    SDL_BlendMode blendmode;
    Uint8 alphaMod, rMod, gMod, bMod;
    int applyModulation = SDL_FALSE;
    int blitRequired = SDL_FALSE;
    int isOpaque = SDL_FALSE;
    if (!surface) {
        return -1;
    }
    if (renderer->viewport.x || renderer->viewport.y) {
        final_rect.x = (int)(renderer->viewport.x + dstrect->x);
        final_rect.y = (int)(renderer->viewport.y + dstrect->y);
    } else {
        final_rect.x = (int)dstrect->x;
        final_rect.y = (int)dstrect->y;
    }
    final_rect.w = (int)dstrect->w;
    final_rect.h = (int)dstrect->h;
    tmp_rect = final_rect;
    tmp_rect.x = 0;
    tmp_rect.y = 0;
    /* It is possible to encounter an RLE encoded surface here and locking it is
     * necessary because this code is going to access the pixel buffer directly.
     */
    if (SDL_MUSTLOCK(src)) {
        SDL_LockSurface(src);
    }
    /* Clone the source surface but use its pixel buffer directly.
     * The original source surface must be treated as read-only.
     */
    src_clone = SDL_CreateRGBSurfaceFrom(src->pixels, src->w, src->h, src->format->BitsPerPixel, src->pitch,
                                         src->format->Rmask, src->format->Gmask,
                                         src->format->Bmask, src->format->Amask);
    if (src_clone == NULL) {
        if (SDL_MUSTLOCK(src)) {
            SDL_UnlockSurface(src);
        }
        return -1;
    }
    SDL_GetSurfaceBlendMode(src, &blendmode);
    SDL_GetSurfaceAlphaMod(src, &alphaMod);
    SDL_GetSurfaceColorMod(src, &rMod, &gMod, &bMod);
    /* SDLgfx_rotateSurface only accepts 32-bit surfaces with a 8888 layout. Everything else has to be converted. */
    if (src->format->BitsPerPixel != 32 || SDL_PIXELLAYOUT(src->format->format) != SDL_PACKEDLAYOUT_8888 || !src->format->Amask) {
        blitRequired = SDL_TRUE;
    }
    /* If scaling and cropping is necessary, it has to be taken care of before the rotation. */
    if (!(srcrect->w == final_rect.w && srcrect->h == final_rect.h && srcrect->x == 0 && srcrect->y == 0)) {
        blitRequired = SDL_TRUE;
    }
    /* srcrect is not selecting the whole src surface, so cropping is needed */
    if (!(srcrect->w == src->w && srcrect->h == src->h && srcrect->x == 0 && srcrect->y == 0)) {
        blitRequired = SDL_TRUE;
    }
    /* The color and alpha modulation has to be applied before the rotation when using the NONE and MOD blend modes. */
    if ((blendmode == SDL_BLENDMODE_NONE || blendmode == SDL_BLENDMODE_MOD) && (alphaMod & rMod & gMod & bMod) != 255) {
        applyModulation = SDL_TRUE;
        SDL_SetSurfaceAlphaMod(src_clone, alphaMod);
        SDL_SetSurfaceColorMod(src_clone, rMod, gMod, bMod);
    }
    /* Opaque surfaces are much easier to handle with the NONE blend mode. */
    if (blendmode == SDL_BLENDMODE_NONE && !src->format->Amask && alphaMod == 255) {
        isOpaque = SDL_TRUE;
    }
    /* The NONE blend mode requires a mask for non-opaque surfaces. This mask will be used
     * to clear the pixels in the destination surface. The other steps are explained below.
     */
    if (blendmode == SDL_BLENDMODE_NONE && !isOpaque) {
        mask = SDL_CreateRGBSurface(0, final_rect.w, final_rect.h, 32,
                                    0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
        if (mask == NULL) {
            retval = -1;
        } else {
            SDL_SetSurfaceBlendMode(mask, SDL_BLENDMODE_MOD);
        }
    }
    /* Create a new surface should there be a format mismatch or if scaling, cropping,
     * or modulation is required. It's possible to use the source surface directly otherwise.
     */
    if (!retval && (blitRequired || applyModulation)) {
        SDL_Rect scale_rect = tmp_rect;
        src_scaled = SDL_CreateRGBSurface(0, final_rect.w, final_rect.h, 32,
                                          0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
        if (src_scaled == NULL) {
            retval = -1;
        } else {
            SDL_SetSurfaceBlendMode(src_clone, SDL_BLENDMODE_NONE);
            retval = SDL_BlitScaled(src_clone, srcrect, src_scaled, &scale_rect);
            SDL_FreeSurface(src_clone);
            src_clone = src_scaled;
            src_scaled = NULL;
        }
    }
    /* SDLgfx_rotateSurface is going to make decisions depending on the blend mode. */
    SDL_SetSurfaceBlendMode(src_clone, blendmode);
    if (!retval) {
        SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, angle, &dstwidth, &dstheight, &cangle, &sangle);
        src_rotated = SDLgfx_rotateSurface(src_clone, angle, dstwidth/2, dstheight/2, (texture->scaleMode == SDL_ScaleModeNearest) ? 0 : 1, flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
        if (src_rotated == NULL) {
            retval = -1;
        }
        if (!retval && mask != NULL) {
            /* The mask needed for the NONE blend mode gets rotated with the same parameters. */
            mask_rotated = SDLgfx_rotateSurface(mask, angle, dstwidth/2, dstheight/2, SDL_FALSE, 0, 0, dstwidth, dstheight, cangle, sangle);
            if (mask_rotated == NULL) {
                retval = -1;
            }
        }
        if (!retval) {
            /* Find out where the new origin is by rotating the four final_rect points around the center and then taking the extremes */
            abscenterx = final_rect.x + (int)center->x;
            abscentery = final_rect.y + (int)center->y;
            /* Compensate the angle inversion to match the behaviour of the other backends */
            sangle = -sangle;
            /* Top Left */
            px = final_rect.x - abscenterx;
            py = final_rect.y - abscentery;
            p1x = px * cangle - py * sangle + abscenterx;
            p1y = px * sangle + py * cangle + abscentery;
            /* Top Right */
            px = final_rect.x + final_rect.w - abscenterx;
            py = final_rect.y - abscentery;
            p2x = px * cangle - py * sangle + abscenterx;
            p2y = px * sangle + py * cangle + abscentery;
            /* Bottom Left */
            px = final_rect.x - abscenterx;
            py = final_rect.y + final_rect.h - abscentery;
            p3x = px * cangle - py * sangle + abscenterx;
            p3y = px * sangle + py * cangle + abscentery;
            /* Bottom Right */
            px = final_rect.x + final_rect.w - abscenterx;
            py = final_rect.y + final_rect.h - abscentery;
            p4x = px * cangle - py * sangle + abscenterx;
            p4y = px * sangle + py * cangle + abscentery;
            tmp_rect.x = (int)MIN(MIN(p1x, p2x), MIN(p3x, p4x));
            tmp_rect.y = (int)MIN(MIN(p1y, p2y), MIN(p3y, p4y));
            tmp_rect.w = dstwidth;
            tmp_rect.h = dstheight;
            /* The NONE blend mode needs some special care with non-opaque surfaces.
             * Other blend modes or opaque surfaces can be blitted directly.
             */
            if (blendmode != SDL_BLENDMODE_NONE || isOpaque) {
                if (applyModulation == SDL_FALSE) {
                    /* If the modulation wasn't already applied, make it happen now. */
                    SDL_SetSurfaceAlphaMod(src_rotated, alphaMod);
                    SDL_SetSurfaceColorMod(src_rotated, rMod, gMod, bMod);
                }
                retval = SDL_BlitSurface(src_rotated, NULL, surface, &tmp_rect);
            } else {
                /* The NONE blend mode requires three steps to get the pixels onto the destination surface.
                 * First, the area where the rotated pixels will be blitted to get set to zero.
                 * This is accomplished by simply blitting a mask with the NONE blend mode.
                 * The colorkey set by the rotate function will discard the correct pixels.
                 */
                SDL_Rect mask_rect = tmp_rect;
                SDL_SetSurfaceBlendMode(mask_rotated, SDL_BLENDMODE_NONE);
                retval = SDL_BlitSurface(mask_rotated, NULL, surface, &mask_rect);
                if (!retval) {
                    /* The next step copies the alpha value. This is done with the BLEND blend mode and
                     * by modulating the source colors with 0. Since the destination is all zeros, this
                     * will effectively set the destination alpha to the source alpha.
                     */
                    SDL_SetSurfaceColorMod(src_rotated, 0, 0, 0);
                    mask_rect = tmp_rect;
                    retval = SDL_BlitSurface(src_rotated, NULL, surface, &mask_rect);
                    if (!retval) {
                        /* The last step gets the color values in place. The ADD blend mode simply adds them to
                         * the destination (where the color values are all zero). However, because the ADD blend
                         * mode modulates the colors with the alpha channel, a surface without an alpha mask needs
                         * to be created. This makes all source pixels opaque and the colors get copied correctly.
                         */
                        SDL_Surface *src_rotated_rgb;
                        src_rotated_rgb = SDL_CreateRGBSurfaceFrom(src_rotated->pixels, src_rotated->w, src_rotated->h,
                                                                   src_rotated->format->BitsPerPixel, src_rotated->pitch,
                                                                   src_rotated->format->Rmask, src_rotated->format->Gmask,
                                                                   src_rotated->format->Bmask, 0);
                        if (src_rotated_rgb == NULL) {
                            retval = -1;
                        } else {
                            SDL_SetSurfaceBlendMode(src_rotated_rgb, SDL_BLENDMODE_ADD);
                            retval = SDL_BlitSurface(src_rotated_rgb, NULL, surface, &tmp_rect);
                            SDL_FreeSurface(src_rotated_rgb);
                        }
                    }
                }
                SDL_FreeSurface(mask_rotated);
            }
            if (src_rotated != NULL) {
                SDL_FreeSurface(src_rotated);
            }
        }
    }
    if (SDL_MUSTLOCK(src)) {
        SDL_UnlockSurface(src);
    }
    if (mask != NULL) {
        SDL_FreeSurface(mask);
    }
    if (src_clone != NULL) {
        SDL_FreeSurface(src_clone);
    }
    return retval;
}

static int SW_RenderDrawLines	(	SDL_Renderer *	renderer,
		const SDL_FPoint *	points,
		int	count
	)

static

Definition at line 459 of file SDL_render_sw.c.

References SDL_Renderer::a, SDL_Renderer::b, SDL_Renderer::blendMode, SDL_Surface::format, SDL_Renderer::g, i, SDL_Renderer::r, SDL_BlendLines(), SDL_BLENDMODE_NONE, SDL_DrawLines(), SDL_MapRGBA, SDL_OutOfMemory, SDL_stack_alloc, SDL_stack_free, SW_ActivateRenderer(), SDL_Renderer::viewport, SDL_Point::x, SDL_Rect::x, SDL_Point::y, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    SDL_Point *final_points;
    int i, status;
    if (!surface) {
        return -1;
    }
    final_points = SDL_stack_alloc(SDL_Point, count);
    if (!final_points) {
        return SDL_OutOfMemory();
    }
    if (renderer->viewport.x || renderer->viewport.y) {
        int x = renderer->viewport.x;
        int y = renderer->viewport.y;
        for (i = 0; i < count; ++i) {
            final_points[i].x = (int)(x + points[i].x);
            final_points[i].y = (int)(y + points[i].y);
        }
    } else {
        for (i = 0; i < count; ++i) {
            final_points[i].x = (int)points[i].x;
            final_points[i].y = (int)points[i].y;
        }
    }
    /* Draw the lines! */
    if (renderer->blendMode == SDL_BLENDMODE_NONE) {
        Uint32 color = SDL_MapRGBA(surface->format,
                                   renderer->r, renderer->g, renderer->b,
                                   renderer->a);
        status = SDL_DrawLines(surface, final_points, count, color);
    } else {
        status = SDL_BlendLines(surface, final_points, count,
                                renderer->blendMode,
                                renderer->r, renderer->g, renderer->b,
                                renderer->a);
    }
    SDL_stack_free(final_points);
    return status;
}

static int SW_RenderDrawPoints	(	SDL_Renderer *	renderer,
		const SDL_FPoint *	points,
		int	count
	)

static

Definition at line 410 of file SDL_render_sw.c.

References SDL_Renderer::a, SDL_Renderer::b, SDL_Renderer::blendMode, SDL_Surface::format, SDL_Renderer::g, i, SDL_Renderer::r, SDL_BLENDMODE_NONE, SDL_BlendPoints(), SDL_DrawPoints(), SDL_MapRGBA, SDL_OutOfMemory, SDL_stack_alloc, SDL_stack_free, SW_ActivateRenderer(), SDL_Renderer::viewport, SDL_Point::x, SDL_Rect::x, SDL_Point::y, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    SDL_Point *final_points;
    int i, status;
    if (!surface) {
        return -1;
    }
    final_points = SDL_stack_alloc(SDL_Point, count);
    if (!final_points) {
        return SDL_OutOfMemory();
    }
    if (renderer->viewport.x || renderer->viewport.y) {
        int x = renderer->viewport.x;
        int y = renderer->viewport.y;
        for (i = 0; i < count; ++i) {
            final_points[i].x = (int)(x + points[i].x);
            final_points[i].y = (int)(y + points[i].y);
        }
    } else {
        for (i = 0; i < count; ++i) {
            final_points[i].x = (int)points[i].x;
            final_points[i].y = (int)points[i].y;
        }
    }
    /* Draw the points! */
    if (renderer->blendMode == SDL_BLENDMODE_NONE) {
        Uint32 color = SDL_MapRGBA(surface->format,
                                   renderer->r, renderer->g, renderer->b,
                                   renderer->a);
        status = SDL_DrawPoints(surface, final_points, count, color);
    } else {
        status = SDL_BlendPoints(surface, final_points, count,
                                renderer->blendMode,
                                renderer->r, renderer->g, renderer->b,
                                renderer->a);
    }
    SDL_stack_free(final_points);
    return status;
}

static int SW_RenderFillRects	(	SDL_Renderer *	renderer,
		const SDL_FRect *	rects,
		int	count
	)

static

Definition at line 508 of file SDL_render_sw.c.

References SDL_Renderer::a, SDL_Renderer::b, SDL_Renderer::blendMode, SDL_Surface::format, SDL_Renderer::g, SDL_Rect::h, i, SDL_Renderer::r, SDL_BlendFillRects(), SDL_BLENDMODE_NONE, SDL_FillRects, SDL_MapRGBA, SDL_max, SDL_OutOfMemory, SDL_stack_alloc, SDL_stack_free, SW_ActivateRenderer(), SDL_Renderer::viewport, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    SDL_Rect *final_rects;
    int i, status;
    if (!surface) {
        return -1;
    }
    final_rects = SDL_stack_alloc(SDL_Rect, count);
    if (!final_rects) {
        return SDL_OutOfMemory();
    }
    if (renderer->viewport.x || renderer->viewport.y) {
        int x = renderer->viewport.x;
        int y = renderer->viewport.y;
        for (i = 0; i < count; ++i) {
            final_rects[i].x = (int)(x + rects[i].x);
            final_rects[i].y = (int)(y + rects[i].y);
            final_rects[i].w = SDL_max((int)rects[i].w, 1);
            final_rects[i].h = SDL_max((int)rects[i].h, 1);
        }
    } else {
        for (i = 0; i < count; ++i) {
            final_rects[i].x = (int)rects[i].x;
            final_rects[i].y = (int)rects[i].y;
            final_rects[i].w = SDL_max((int)rects[i].w, 1);
            final_rects[i].h = SDL_max((int)rects[i].h, 1);
        }
    }
    if (renderer->blendMode == SDL_BLENDMODE_NONE) {
        Uint32 color = SDL_MapRGBA(surface->format,
                                   renderer->r, renderer->g, renderer->b,
                                   renderer->a);
        status = SDL_FillRects(surface, final_rects, count, color);
    } else {
        status = SDL_BlendFillRects(surface, final_rects, count,
                                    renderer->blendMode,
                                    renderer->r, renderer->g, renderer->b,
                                    renderer->a);
    }
    SDL_stack_free(final_rects);
    return status;
}

static void SW_RenderPresent ( SDL_Renderer * renderer )

static

Definition at line 859 of file SDL_render_sw.c.

References SDL_UpdateWindowSurface, and SDL_Renderer::window.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Window *window = renderer->window;
    if (window) {
        SDL_UpdateWindowSurface(window);
    }
}

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

static

Definition at line 828 of file SDL_render_sw.c.

References SDL_PixelFormat::BytesPerPixel, SDL_Surface::format, SDL_PixelFormat::format, SDL_Rect::h, SDL_Surface::h, SDL_Surface::pitch, SDL_Surface::pixels, SDL_ConvertPixels, SDL_SetError, SW_ActivateRenderer(), SDL_Rect::w, SDL_Surface::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    Uint32 src_format;
    void *src_pixels;
    if (!surface) {
        return -1;
    }
    /* NOTE: The rect is already adjusted according to the viewport by
     * SDL_RenderReadPixels.
     */
    if (rect->x < 0 || rect->x+rect->w > surface->w ||
        rect->y < 0 || rect->y+rect->h > surface->h) {
        return SDL_SetError("Tried to read outside of surface bounds");
    }
    src_format = surface->format->format;
    src_pixels = (void*)((Uint8 *) surface->pixels +
                    rect->y * surface->pitch +
                    rect->x * surface->format->BytesPerPixel);
    return SDL_ConvertPixels(rect->w, rect->h,
                             src_format, src_pixels, surface->pitch,
                             format, pixels, pitch);
}

static int SW_SetRenderTarget	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

static

Definition at line 340 of file SDL_render_sw.c.

References SDL_Texture::driverdata, SDL_Renderer::driverdata, SW_RenderData::surface, and SW_RenderData::window.

Referenced by SW_CreateRendererForSurface().

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    if (texture ) {
        data->surface = (SDL_Surface *) texture->driverdata;
    } else {
        data->surface = data->window;
    }
    return 0;
}

static int SW_SetTextureAlphaMod	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

static

Definition at line 270 of file SDL_render_sw.c.

References SDL_Texture::a, SDL_PixelFormat::Amask, SDL_Texture::driverdata, SDL_Surface::format, SDL_SetSurfaceAlphaMod, and SDL_SetSurfaceRLE.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    /* If the texture ever has multiple alpha values (surface alpha plus alpha channel), permanently
     * disable RLE (which doesn't support this) to avoid potentially frequent RLE encoding/decoding.
     */
    if (texture->a != 255 && surface->format->Amask) {
        SDL_SetSurfaceRLE(surface, 0);
    }
    return SDL_SetSurfaceAlphaMod(surface, texture->a);
}

static int SW_SetTextureBlendMode	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

static

Definition at line 283 of file SDL_render_sw.c.

References SDL_Texture::blendMode, SDL_Texture::driverdata, SDL_BLENDMODE_ADD, SDL_BLENDMODE_MOD, SDL_SetSurfaceBlendMode, and SDL_SetSurfaceRLE.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    /* If add or mod blending are ever enabled, permanently disable RLE (which doesn't support
     * them) to avoid potentially frequent RLE encoding/decoding.
     */
    if ((texture->blendMode == SDL_BLENDMODE_ADD || texture->blendMode == SDL_BLENDMODE_MOD)) {
        SDL_SetSurfaceRLE(surface, 0);
    }
    return SDL_SetSurfaceBlendMode(surface, texture->blendMode);
}

static int SW_SetTextureColorMod	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

static

Definition at line 256 of file SDL_render_sw.c.

References SDL_Texture::b, SDL_Texture::driverdata, SDL_Texture::g, SDL_Texture::r, SDL_SetSurfaceColorMod, and SDL_SetSurfaceRLE.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    /* If the color mod is ever enabled (non-white), permanently disable RLE (which doesn't support
     * color mod) to avoid potentially frequent RLE encoding/decoding.
     */
    if ((texture->r & texture->g & texture->b) != 255) {
        SDL_SetSurfaceRLE(surface, 0);
    }
    return SDL_SetSurfaceColorMod(surface, texture->r, texture->g,
                                  texture->b);
}

static void SW_UnlockTexture	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture
	)

static

Definition at line 335 of file SDL_render_sw.c.

Referenced by SW_CreateRendererForSurface().

{

}

static int SW_UpdateClipRect ( SDL_Renderer * renderer )

static

Definition at line 368 of file SDL_render_sw.c.

References SDL_Renderer::clip_rect, SDL_Renderer::clipping_enabled, SDL_Renderer::driverdata, SDL_IntersectRect, SDL_SetClipRect, SW_RenderData::surface, SDL_Renderer::viewport, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_ActivateRenderer(), and SW_CreateRendererForSurface().

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Surface *surface = data->surface;
    if (surface) {
        if (renderer->clipping_enabled) {
            SDL_Rect clip_rect;
            clip_rect = renderer->clip_rect;
            clip_rect.x += renderer->viewport.x;
            clip_rect.y += renderer->viewport.y;
            SDL_IntersectRect(&renderer->viewport, &clip_rect, &clip_rect);
            SDL_SetClipRect(surface, &clip_rect);
        } else {
            SDL_SetClipRect(surface, &renderer->viewport);
        }
    }
    return 0;
}

static int SW_UpdateTexture	(	SDL_Renderer *	renderer,
		SDL_Texture *	texture,
		const SDL_Rect *	rect,
		const void *	pixels,
		int	pitch
	)

static

Definition at line 296 of file SDL_render_sw.c.

References SDL_PixelFormat::BytesPerPixel, SDL_Texture::driverdata, SDL_Surface::format, SDL_Rect::h, SDL_Surface::pitch, SDL_Surface::pixels, SDL_LockSurface, SDL_memcpy, SDL_MUSTLOCK, SDL_UnlockSurface, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    Uint8 *src, *dst;
    int row;
    size_t length;
    if(SDL_MUSTLOCK(surface))
        SDL_LockSurface(surface);
    src = (Uint8 *) pixels;
    dst = (Uint8 *) surface->pixels +
                        rect->y * surface->pitch +
                        rect->x * surface->format->BytesPerPixel;
    length = rect->w * surface->format->BytesPerPixel;
    for (row = 0; row < rect->h; ++row) {
        SDL_memcpy(dst, src, length);
        src += pitch;
        dst += surface->pitch;
    }
    if(SDL_MUSTLOCK(surface))
        SDL_UnlockSurface(surface);
    return 0;
}

static int SW_UpdateViewport ( SDL_Renderer * renderer )

static

Definition at line 353 of file SDL_render_sw.c.

References SDL_Renderer::driverdata, SDL_SetClipRect, SW_RenderData::surface, and SDL_Renderer::viewport.

Referenced by SW_ActivateRenderer(), and SW_CreateRendererForSurface().

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Surface *surface = data->surface;
    if (!surface) {
        /* We'll update the viewport after we recreate the surface */
        return 0;
    }
    SDL_SetClipRect(data->surface, &renderer->viewport);
    return 0;
}

static void SW_WindowEvent	(	SDL_Renderer *	renderer,
		const SDL_WindowEvent *	event
	)

static

Definition at line 194 of file SDL_render_sw.c.

References SDL_Renderer::driverdata, SDL_WindowEvent::event, NULL, SDL_WINDOWEVENT_SIZE_CHANGED, SW_RenderData::surface, and SW_RenderData::window.

Referenced by SW_CreateRendererForSurface().

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
        data->surface = NULL;
        data->window = NULL;
    }
}

Variable Documentation

SDL_RenderDriver SW_RenderDriver

Initial value:

 {
    SW_CreateRenderer,
    {
     "software",
     SDL_RENDERER_SOFTWARE | SDL_RENDERER_TARGETTEXTURE,
     8,
     {
      SDL_PIXELFORMAT_ARGB8888,
      SDL_PIXELFORMAT_ABGR8888,
      SDL_PIXELFORMAT_RGBA8888,
      SDL_PIXELFORMAT_BGRA8888,
      SDL_PIXELFORMAT_RGB888,
      SDL_PIXELFORMAT_BGR888,
      SDL_PIXELFORMAT_RGB565,
      SDL_PIXELFORMAT_RGB555
     },
     0,
     0}
}

Definition at line 78 of file SDL_render_sw.c.

Data Structures

Functions

Variables

Function Documentation

Variable Documentation