uint32_t progressive_render(int quality, int bytes_read) {
printf("%i bytes read, rendering at quality=%.2f%%\n",bytes_read, 0.01*quality);
FLIF_IMAGE* image = flif_decoder_get_image(d, 0);
if (!image) { printf("Error: No decoded image found\n"); return 1; }
uint32_t w = flif_image_get_width(image);
uint32_t h = flif_image_get_height(image);
if (!window) window = SDL_CreateWindow("FLIF Viewer", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, 0);
if (!window) { printf("Error: Could not create window\n"); return 2; }
char title[100];
sprintf(title,"%ix%i FLIF image [read %i bytes, quality=%.2f%%]",w,h,bytes_read, 0.01*quality);
SDL_SetWindowTitle(window,title);
SDL_Surface *canvas = SDL_GetWindowSurface(window);
if (!canvas) { printf("Error: Could not get canvas\n"); return 2; }
if (!surf) surf = SDL_CreateRGBSurface(0,w,h,32,0x000000FF,0x0000FF00,0x00FF0000,0xFF000000);
if (!surf) { printf("Error: Could not create surface\n"); return 2; }
char* pp =(char*) surf->pixels;
for (uint32_t r=0; r<h; r++) {
flif_image_read_row_RGBA8(image, r, pp, w * sizeof(RGBA));
pp += surf->pitch;
}
if (flif_image_get_nb_channels(image) > 3) {
// SDL_FillRect(canvas,NULL,0);
// Draw checkerboard background for image with alpha channel
SDL_Rect sq; sq.w=20; sq.h=20;
for (sq.y=0; sq.y<h; sq.y+=sq.h) for (sq.x=0; sq.x<w; sq.x+=sq.w)
SDL_FillRect(canvas,&sq,((sq.y/sq.h + sq.x/sq.w)&1 ? 0xFF606060 : 0xFFA0A0A0));
}
SDL_BlitSurface(surf,NULL,canvas,NULL);
SDL_UpdateWindowSurface(window);
SDL_Event e;
while (SDL_PollEvent(&e)) {if (!do_event(e)) return 0;} // stop decoding
//SDL_Delay(500);
return quality + 500; // call me back when you have at least 5% better quality
}
uint32_t progressive_render(int32_t quality, int64_t bytes_read) {
while (drawing) {SDL_Delay(50);}
drawing = 1;
printf("%lli bytes read, rendering at quality=%.2f%%\n",(unsigned long long int) bytes_read, 0.01*quality);
animation = (flif_decoder_num_images(d) > 1);
FLIF_IMAGE* image = flif_decoder_get_image(d, 0);
if (!image) { printf("Error: No decoded image found\n"); return 1; }
uint32_t w = flif_image_get_width(image);
uint32_t h = flif_image_get_height(image);
if (!window) { printf("Error: Could not create window\n"); return 2; }
SDL_SetWindowSize(window,w,h);
char title[100];
sprintf(title,"%ix%i FLIF image [read %lli bytes, quality=%.2f%%]",w,h,(unsigned long long int) bytes_read, 0.01*quality);
SDL_SetWindowTitle(window,title);
for (int f = 0; f< flif_decoder_num_images(d); f++) {
FLIF_IMAGE* image = flif_decoder_get_image(d, f);
if (!image) { printf("Error: No decoded image found\n"); return 1; }
uint32_t w = flif_image_get_width(image);
uint32_t h = flif_image_get_height(image);
frame_delay[f] = flif_image_get_frame_delay(image);
if (!surf[f]) surf[f] = SDL_CreateRGBSurface(0,w,h,32,0x000000FF,0x0000FF00,0x00FF0000,0xFF000000);
if (!surf[f]) { printf("Error: Could not create surface\n"); return 1; }
if (!tmpsurf) tmpsurf = SDL_CreateRGBSurface(0,w,h,32,0x000000FF,0x0000FF00,0x00FF0000,0xFF000000);
if (!tmpsurf) { printf("Error: Could not create surface\n"); return 1; }
char* pp =(char*) tmpsurf->pixels;
for (uint32_t r=0; r<h; r++) {
flif_image_read_row_RGBA8(image, r, pp, w * sizeof(RGBA));
pp += tmpsurf->pitch;
}
if (flif_image_get_nb_channels(image) > 3) {
if (!bgsurf) {
bgsurf = SDL_CreateRGBSurface(0,w,h,32,0x000000FF,0x0000FF00,0x00FF0000,0xFF000000);
// Draw checkerboard background for image with alpha channel
SDL_Rect sq; sq.w=20; sq.h=20;
for (sq.y=0; sq.y<h; sq.y+=sq.h) for (sq.x=0; sq.x<w; sq.x+=sq.w)
SDL_FillRect(bgsurf,&sq,((sq.y/sq.h + sq.x/sq.w)&1 ? 0xFF606060 : 0xFFA0A0A0));
}
SDL_BlitSurface(bgsurf,NULL,surf[f],NULL);
}
SDL_BlitSurface(tmpsurf,NULL,surf[f],NULL);
}
drawing = 0;
draw_image();
// SDL_Delay(1000);
if (quit) return 0; // stop decoding
return quality + 1000; // call me back when you have at least 10.00% better quality
}
// Callback function: converts (partially) decoded image/animation to a/several SDL_Texture(s),
// resizes the viewer window if needed, and calls draw_image()
// Input arguments are: quality (0..10000), current position in the .flif file
// Output is the desired minimal quality before doing the next callback
uint32_t progressive_render(int32_t quality, int64_t bytes_read) {
loading = 1;
while (drawing) {SDL_Delay(50);} // don't touch the textures until we're done drawing
printf("%lli bytes read, rendering at quality=%.2f%%\n",(long long int) bytes_read, 0.01*quality);
FLIF_IMAGE* image = flif_decoder_get_image(d, 0);
if (!image) { printf("Error: No decoded image found\n"); return 1; }
uint32_t w = flif_image_get_width(image);
uint32_t h = flif_image_get_height(image);
// set the window title and size
if (!window) { printf("Error: Could not create window\n"); return 2; }
char title[100];
sprintf(title,"FLIF image decoded at %ix%i [read %lli bytes, quality=%.2f%%]",w,h,(long long int) bytes_read, 0.01*quality);
SDL_SetWindowTitle(window,title);
if (!window_size_set) {
int ww = (w > dm.w ? dm.w : w);
int wh = (h > dm.h ? dm.h : h);
if (ww > w * wh / h) ww = wh * w / h;
else if (ww < w * wh / h) wh = ww * h / w;
if (w > dm.w*8/10 && h > dm.h*8/10) { ww = ww*8/10; wh = wh*8/10; }
SDL_SetWindowSize(window,ww,wh);
SDL_SetWindowPosition(window,SDL_WINDOWPOS_CENTERED,SDL_WINDOWPOS_CENTERED);
if (w > dm.w*8/10 && h > dm.h*8/10) { SDL_MaximizeWindow(window); }
window_size_set = 1;
}
// allocate enough room for the texture pointers and frame delays
if (!image_frame) image_frame = calloc(flif_decoder_num_images(d), sizeof(FLIF_IMAGE*));
if (!frame_delay) frame_delay = calloc(flif_decoder_num_images(d), sizeof(int));
// produce one SDL_Texture per frame
for (int f = 0; f < flif_decoder_num_images(d); f++) {
if (quit) return 0;
FLIF_IMAGE* image = flif_decoder_get_image(d, f);
if (!image) { printf("Error: No decoded image found\n"); return 1; }
frame_delay[f] = flif_image_get_frame_delay(image);
// Copy the decoded pixels to a temporary surface
if (!tmpsurf) tmpsurf = SDL_CreateRGBSurface(0,w,h,32,0x000000FF,0x0000FF00,0x00FF0000,0xFF000000);
if (!tmpsurf) { printf("Error: Could not create surface\n"); return 1; }
char* pp =(char*) tmpsurf->pixels;
for (uint32_t r=0; r<h; r++) {
flif_image_read_row_RGBA8(image, r, pp, w * sizeof(RGBA));
pp += tmpsurf->pitch;
}
// Draw checkerboard background for image/animation with alpha channel
if (flif_image_get_nb_channels(image) > 3) {
if (!bgsurf) bgsurf = SDL_CreateRGBSurface(0,w,h,32,0x000000FF,0x0000FF00,0x00FF0000,0xFF000000);
if (!bgsurf) { printf("Error: Could not create surface\n"); return 1; }
SDL_Rect sq; sq.w=20; sq.h=20;
for (sq.y=0; sq.y<h; sq.y+=sq.h) for (sq.x=0; sq.x<w; sq.x+=sq.w)
SDL_FillRect(bgsurf,&sq,((sq.y/sq.h + sq.x/sq.w)&1 ? 0xFF606060 : 0xFFA0A0A0));
// Alpha-blend decoded frame on top of checkerboard background
SDL_BlitSurface(tmpsurf,NULL,bgsurf,NULL);
SDL_FreeSurface(tmpsurf); tmpsurf = bgsurf; bgsurf = NULL;
}
if (!renderer) { printf("Error: Could not get renderer\n"); return 1; }
if (image_frame[f]) SDL_DestroyTexture(image_frame[f]);
// Convert the surface to a texture (for accelerated blitting)
image_frame[f] = SDL_CreateTextureFromSurface(renderer, tmpsurf);
if (!image_frame[f]) { printf("Could not create texture!\n"); quit=1; return 0; }
SDL_SetTextureBlendMode(image_frame[f],SDL_BLENDMODE_NONE);
}
SDL_FreeSurface(tmpsurf); tmpsurf=NULL;
loading = 0;
draw_image();
// setting nb_frames to a value > 1 will make sure the main thread keeps calling draw_image()
nb_frames = flif_decoder_num_images(d);
if (quit) return 0; // stop decoding
return quality + 1000; // call me back when you have at least 10.00% better quality
}