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testshape.c
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testshape.c
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#include <stdlib.h>
#include <math.h>
#include <stdio.h>
#include "SDL.h"
#include "SDL_shape.h"
#define SHAPED_WINDOW_X 150
#define SHAPED_WINDOW_Y 150
#define SHAPED_WINDOW_DIMENSION 640
#define TICK_INTERVAL 1000/10
typedef struct LoadedPicture {
SDL_Surface *surface;
SDL_Texture *texture;
SDL_WindowShapeMode mode;
} LoadedPicture;
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();
}
static Uint32 next_time;
Uint32 time_left() {
Uint32 now = SDL_GetTicks();
if(next_time <= now)
return 0;
else
return next_time - now;
}
int main(int argc,char** argv) {
Uint8 num_pictures;
LoadedPicture* pictures;
int i, j;
SDL_PixelFormat* format = NULL;
SDL_Window *window;
SDL_Color black = {0,0,0,0xff};
SDL_Event event;
int event_pending = 0;
int should_exit = 0;
unsigned int current_picture;
int button_down;
Uint32 pixelFormat = 0;
int access = 0;
SDL_Rect texture_dimensions;;
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);
}
num_pictures = argc - 1;
pictures = (LoadedPicture *)malloc(sizeof(LoadedPicture)*num_pictures);
for(i=0;i<num_pictures;i++)
pictures[i].surface = NULL;
for(i=0;i<num_pictures;i++) {
pictures[i].surface = SDL_LoadBMP(argv[i+1]);
if(pictures[i].surface == NULL) {
j = 0;
for(j=0;j<num_pictures;j++)
if(pictures[j].surface != NULL)
SDL_FreeSurface(pictures[j].surface);
free(pictures);
SDL_VideoQuit();
printf("Could not load surface from named bitmap file.\n");
exit(-3);
}
format = pictures[i].surface->format;
if(format->Amask != 0) {
pictures[i].mode.mode = ShapeModeBinarizeAlpha;
pictures[i].mode.parameters.binarizationCutoff = 255;
}
else {
pictures[i].mode.mode = ShapeModeColorKey;
pictures[i].mode.parameters.colorKey = black;
}
}
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++)
SDL_FreeSurface(pictures[i].surface);
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++)
SDL_FreeSurface(pictures[i].surface);
free(pictures);
SDL_VideoQuit();
printf("Could not create rendering context for SDL_Shape window.\n");
exit(-5);
}
for(i=0;i<num_pictures;i++)
pictures[i].texture = NULL;
for(i=0;i<num_pictures;i++) {
pictures[i].texture = SDL_CreateTextureFromSurface(0,pictures[i].surface);
if(pictures[i].texture == NULL) {
j = 0;
for(j=0;j<num_pictures;i++)
if(pictures[i].texture != NULL)
SDL_DestroyTexture(pictures[i].texture);
for(i=0;i<num_pictures;i++)
SDL_FreeSurface(pictures[i].surface);
free(pictures);
SDL_DestroyRenderer(window);
SDL_DestroyWindow(window);
SDL_VideoQuit();
printf("Could not create texture for SDL_shape.\n");
exit(-6);
}
}
event_pending = 0;
should_exit = 0;
event_pending = SDL_PollEvent(&event);
current_picture = 0;
button_down = 0;
texture_dimensions.h = 0;
texture_dimensions.w = 0;
texture_dimensions.x = 0;
texture_dimensions.y = 0;
SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
next_time = SDL_GetTicks() + TICK_INTERVAL;
while(should_exit == 0) {
event_pending = SDL_PollEvent(&event);
if(event_pending == 1) {
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;
current_picture += 1;
if(current_picture >= num_pictures)
current_picture = 0;
SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
}
if(event.type == SDL_QUIT)
should_exit = 1;
event_pending = 0;
}
render(window,pictures[current_picture].texture,texture_dimensions);
SDL_Delay(time_left());
next_time += TICK_INTERVAL;
}
//Free the textures.
for(i=0;i<num_pictures;i++)
SDL_DestroyTexture(pictures[i].texture);
//Destroy the window.
SDL_DestroyWindow(window);
//Free the original surfaces backing the textures.
for(i=0;i<num_pictures;i++)
SDL_FreeSurface(pictures[i].surface);
free(pictures);
//Call SDL_VideoQuit() before quitting.
SDL_VideoQuit();
return 0;
}