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testshape.c
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#include <stdlib.h>
#include <math.h>
#include <SDL_events.h>
#include <SDL_rect.h>
#include <SDL_pixels.h>
#include <SDL_video.h>
#include <SDL_shape.h>
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#include <SDL_keysym.h>
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#include <SDL_timer.h>
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#define SHAPED_WINDOW_X 150
#define SHAPED_WINDOW_Y 150
#define SHAPED_WINDOW_DIMENSION 640
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#define TICK_INTERVAL 1000/60
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typedef struct LoadedPicture {
SDL_Surface *surface;
SDL_Texture *texture;
SDL_WindowShapeMode mode;
} LoadedPicture;
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void render(SDL_Window* window,SDL_Texture *texture,SDL_Rect texture_dimensions) {
SDL_SelectRenderer(window);
//Clear render-target to blue.
SDL_SetRenderDrawColor(0x00,0x00,0xff,0xff);
SDL_RenderClear();
//Render the texture.
SDL_RenderCopy(texture,&texture_dimensions,&texture_dimensions);
SDL_RenderPresent();
}
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static Uint32 next_time;
Uint32 time_left() {
Uint32 now = SDL_GetTicks();
if(next_time <= now)
return 0;
else
return next_time - now;
}
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int main(int argc,char** argv) {
if(argc < 2) {
printf("SDL_Shape requires at least one bitmap file as argument.\n");
exit(-1);
}
if(SDL_VideoInit(NULL,0) == -1) {
printf("Could not initialize SDL video.\n");
exit(-2);
}
Uint8 num_pictures = argc - 1;
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LoadedPicture* pictures = malloc(sizeof(LoadedPicture)*num_pictures);
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int i = 0;
for(i=0;i<num_pictures;i++)
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pictures[i].surface = NULL;
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for(i=0;i<num_pictures;i++) {
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pictures[i].surface = SDL_LoadBMP(argv[i+1]);
if(pictures[i].surface == NULL) {
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int j = 0;
for(j=0;j<num_pictures;j++)
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if(pictures[j].surface != NULL)
SDL_FreeSurface(pictures[j].surface);
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free(pictures);
SDL_VideoQuit();
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printf("Could not load surface from named bitmap file.\n");
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exit(-3);
}
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SDL_PixelFormat* format = pictures[i].surface->format;
Uint32 format_enum = SDL_MasksToPixelFormatEnum (format->BitsPerPixel,format->Rmask,format->Gmask, format->Bmask,format->Amask);
if(SDL_ISPIXELFORMAT_ALPHA(format_enum)) {
pictures[i].mode.mode = ShapeModeBinarizeAlpha;
pictures[i].mode.parameters.binarizationCutoff = 1;
}
else {
pictures[i].mode.mode = ShapeModeColorKey;
SDL_Color black = {0,0,0,0xff};
pictures[i].mode.parameters.colorKey = black;
}
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}
SDL_Window *window = SDL_CreateShapedWindow("SDL_Shape test",SHAPED_WINDOW_X,SHAPED_WINDOW_Y,SHAPED_WINDOW_DIMENSION,SHAPED_WINDOW_DIMENSION,SDL_WINDOW_RESIZABLE | SDL_WINDOW_SHOWN);
if(window == NULL) {
for(i=0;i<num_pictures;i++)
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SDL_FreeSurface(pictures[i].surface);
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free(pictures);
SDL_VideoQuit();
printf("Could not create shaped window for SDL_Shape.\n");
exit(-4);
}
if(SDL_CreateRenderer(window,-1,SDL_RENDERER_PRESENTFLIP2) == -1) {
SDL_DestroyWindow(window);
for(i=0;i<num_pictures;i++)
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SDL_FreeSurface(pictures[i].surface);
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free(pictures);
SDL_VideoQuit();
printf("Could not create rendering context for SDL_Shape window.\n");
exit(-5);
}
for(i=0;i<num_pictures;i++)
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pictures[i].texture = NULL;
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for(i=0;i<num_pictures;i++) {
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pictures[i].texture = SDL_CreateTextureFromSurface(0,pictures[i].surface);
if(pictures[i].texture == NULL) {
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int j = 0;
for(j=0;j<num_pictures;i++)
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if(pictures[i].texture != NULL)
SDL_DestroyTexture(pictures[i].texture);
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for(i=0;i<num_pictures;i++)
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SDL_FreeSurface(pictures[i].surface);
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free(pictures);
SDL_DestroyRenderer(window);
SDL_DestroyWindow(window);
SDL_VideoQuit();
printf("Could not create texture for SDL_shape.\n");
exit(-6);
}
}
SDL_Event event;
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int event_pending = 0,should_exit = 0;
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event_pending = SDL_PollEvent(&event);
unsigned int current_picture = 0;
SDL_WindowShapeMode mode = {ShapeModeDefault,1};
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int button_down = 0;
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Uint32 format = 0,access = 0;
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SDL_Rect texture_dimensions = {0,0,0,0};
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SDL_QueryTexture(pictures[current_picture].texture,&format,&access,&texture_dimensions.w,&texture_dimensions.h);
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SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
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SDL_SetWindowShape(window,pictures[current_picture].surface,&mode);
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next_time = SDL_GetTicks() + TICK_INTERVAL;
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while(should_exit == 0) {
event_pending = SDL_PollEvent(&event);
if(event_pending == 1) {
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if(event.type == SDL_KEYDOWN) {
button_down = 1;
if(event.key.keysym.sym == SDLK_ESCAPE)
should_exit = 1;
}
if(button_down && event.type == SDL_KEYUP) {
button_down = 0;
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current_picture += 1;
if(current_picture >= num_pictures)
current_picture = 0;
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SDL_QueryTexture(pictures[current_picture].texture,&format,&access,&texture_dimensions.w,&texture_dimensions.h);
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SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
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SDL_SetWindowShape(window,pictures[current_picture].surface,&mode);
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}
if(event.type == SDL_QUIT)
should_exit = 1;
event_pending = 0;
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}
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render(window,pictures[current_picture].texture,texture_dimensions);
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SDL_Delay(time_left());
next_time += TICK_INTERVAL;
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}
//Free the textures.
for(i=0;i<num_pictures;i++)
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SDL_DestroyTexture(pictures[i].texture);
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//Destroy the window.
SDL_DestroyWindow(window);
//Free the original surfaces backing the textures.
for(i=0;i<num_pictures;i++)
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SDL_FreeSurface(pictures[i].surface);
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free(pictures);
//Call SDL_VideoQuit() before quitting.
SDL_VideoQuit();
}