#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "SDL_test_common.h"

Include dependency graph for testscale.c:

Data Structures
struct	DrawState

Macros
#define	WINDOW_WIDTH 640
#define	WINDOW_HEIGHT 480

Functions
static void	quit (int rc)
SDL_Texture *	LoadTexture (SDL_Renderer renderer, char file, SDL_bool transparent)
void	Draw (DrawState *s)
void	loop ()
int	main (int argc, char *argv[])

Variables
static SDLTest_CommonState *	state
DrawState *	drawstates
int	done

Macro Definition Documentation

#define WINDOW_HEIGHT 480

Definition at line 25 of file testscale.c.

#define WINDOW_WIDTH 640

Definition at line 24 of file testscale.c.

Function Documentation

void Draw ( DrawState * s )

Definition at line 100 of file testscale.c.

References DrawState::background, SDL_Rect::h, NULL, DrawState::renderer, DrawState::scale_direction, SDL_RenderCopy, SDL_RenderGetViewport, SDL_RenderPresent, DrawState::sprite, DrawState::sprite_rect, viewport, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

{
    SDL_Rect viewport;
    SDL_RenderGetViewport(s->renderer, &viewport);
    /* Draw the background */
    SDL_RenderCopy(s->renderer, s->background, NULL, NULL);
    /* Scale and draw the sprite */
    s->sprite_rect.w += s->scale_direction;
    s->sprite_rect.h += s->scale_direction;
    if (s->scale_direction > 0) {
        if (s->sprite_rect.w >= viewport.w || s->sprite_rect.h >= viewport.h) {
            s->scale_direction = -1;
        }
    } else {
        if (s->sprite_rect.w <= 1 || s->sprite_rect.h <= 1) {
            s->scale_direction = 1;
        }
    }
    s->sprite_rect.x = (viewport.w - s->sprite_rect.w) / 2;
    s->sprite_rect.y = (viewport.h - s->sprite_rect.h) / 2;
    SDL_RenderCopy(s->renderer, s->sprite, NULL, &s->sprite_rect);
    /* Update the screen! */
    SDL_RenderPresent(s->renderer);
}

SDL_Texture* LoadTexture	(	SDL_Renderer *	renderer,
		char *	file,
		SDL_bool	transparent
	)

Definition at line 50 of file testscale.c.

References SDL_PixelFormat::BitsPerPixel, SDL_Surface::format, NULL, SDL_PixelFormat::palette, SDL_Surface::pixels, SDL_CreateTextureFromSurface, SDL_FreeSurface, SDL_GetError, SDL_LoadBMP, SDL_LOG_CATEGORY_APPLICATION, SDL_LogError, SDL_SetColorKey, and SDL_TRUE.

{
    SDL_Surface *temp;
    SDL_Texture *texture;
    /* Load the sprite image */
    temp = SDL_LoadBMP(file);
    if (temp == NULL) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError());
        return NULL;
    }
    /* Set transparent pixel as the pixel at (0,0) */
    if (transparent) {
        if (temp->format->palette) {
            SDL_SetColorKey(temp, SDL_TRUE, *(Uint8 *) temp->pixels);
        } else {
            switch (temp->format->BitsPerPixel) {
            case 15:
                SDL_SetColorKey(temp, SDL_TRUE,
                                (*(Uint16 *) temp->pixels) & 0x00007FFF);
                break;
            case 16:
                SDL_SetColorKey(temp, SDL_TRUE, *(Uint16 *) temp->pixels);
                break;
            case 24:
                SDL_SetColorKey(temp, SDL_TRUE,
                                (*(Uint32 *) temp->pixels) & 0x00FFFFFF);
                break;
            case 32:
                SDL_SetColorKey(temp, SDL_TRUE, *(Uint32 *) temp->pixels);
                break;
            }
        }
    }
    /* Create textures from the image */
    texture = SDL_CreateTextureFromSurface(renderer, temp);
    if (!texture) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError());
        SDL_FreeSurface(temp);
        return NULL;
    }
    SDL_FreeSurface(temp);
    /* We're ready to roll. :) */
    return texture;
}

void loop ( )

Definition at line 131 of file testscale.c.

References done, Draw(), i, NULL, SDLTest_CommonState::num_windows, SDL_PollEvent, SDLTest_CommonEvent(), and SDLTest_CommonState::windows.

{
    int i;
    SDL_Event event;
    /* Check for events */
    while (SDL_PollEvent(&event)) {
        SDLTest_CommonEvent(state, &event, &done);
    }
    for (i = 0; i < state->num_windows; ++i) {
        if (state->windows[i] == NULL)
            continue;
        Draw(&drawstates[i]);
    }
#ifdef __EMSCRIPTEN__
    if (done) {
        emscripten_cancel_main_loop();
    }
#endif
}

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 153 of file testscale.c.

References DrawState::background, done, SDL_Rect::h, i, LoadTexture(), loop(), NULL, SDLTest_CommonState::num_windows, quit(), DrawState::renderer, SDLTest_CommonState::renderers, DrawState::scale_direction, SDL_FALSE, SDL_GetTicks(), SDL_INIT_VIDEO, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogSetPriority, SDL_QueryTexture, SDL_stack_alloc, SDL_stack_free, SDL_TRUE, SDLTest_CommonArg(), SDLTest_CommonCreateState(), SDLTest_CommonInit(), SDLTest_CommonUsage(), DrawState::sprite, DrawState::sprite_rect, SDL_Rect::w, DrawState::window, and SDLTest_CommonState::windows.

{
    int i;
    int frames;
    Uint32 then, now;
    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
    /* Initialize test framework */
    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
    if (!state) {
        return 1;
    }
    for (i = 1; i < argc;) {
        int consumed;
        consumed = SDLTest_CommonArg(state, i);
        if (consumed == 0) {
            SDL_Log("Usage: %s %s\n", argv[0], SDLTest_CommonUsage(state));
            return 1;
        }
        i += consumed;
    }
    if (!SDLTest_CommonInit(state)) {
        quit(2);
    }
    drawstates = SDL_stack_alloc(DrawState, state->num_windows);
    for (i = 0; i < state->num_windows; ++i) {
        DrawState *drawstate = &drawstates[i];
        drawstate->window = state->windows[i];
        drawstate->renderer = state->renderers[i];
        drawstate->sprite = LoadTexture(drawstate->renderer, "icon.bmp", SDL_TRUE);
        drawstate->background = LoadTexture(drawstate->renderer, "sample.bmp", SDL_FALSE);
        if (!drawstate->sprite || !drawstate->background) {
            quit(2);
        }
        SDL_QueryTexture(drawstate->sprite, NULL, NULL,
                         &drawstate->sprite_rect.w, &drawstate->sprite_rect.h);
        drawstate->scale_direction = 1;
    }
    /* Main render loop */
    frames = 0;
    then = SDL_GetTicks();
    done = 0;
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done) {
        ++frames;
        loop();
    }
#endif
    /* Print out some timing information */
    now = SDL_GetTicks();
    if (now > then) {
        double fps = ((double) frames * 1000) / (now - then);
        SDL_Log("%2.2f frames per second\n", fps);
    }
    SDL_stack_free(drawstates);
    quit(0);
    return 0;
}

static void quit ( int rc )

static

Definition at line 43 of file testscale.c.

References SDLTest_CommonQuit().

{
    SDLTest_CommonQuit(state);
    exit(rc);
}

Variable Documentation

int done

Definition at line 39 of file testscale.c.

DrawState* drawstates

Definition at line 38 of file testscale.c.

SDLTest_CommonState* state

static

Definition at line 27 of file testscale.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation