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emscripten: Add SDL_SetWindowIcon implementation. (#14490)

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This commit is contained in:
Edgar San Martin, Jr.
2025-11-20 23:16:18 -05:00
committed by GitHub
parent 082848e945
commit be15de6baa
1 changed files with 52 additions and 2 deletions
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54
src/video/emscripten/SDL_emscriptenvideo.c
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@@ -48,6 +48,7 @@ static void Emscripten_DestroyWindow(SDL_VideoDevice *_this, SDL_Window *window)
static SDL_FullscreenResult Emscripten_SetWindowFullscreen(SDL_VideoDevice *_this, SDL_Window *window, SDL_VideoDisplay *display, SDL_FullscreenOp fullscreen);
static void Emscripten_PumpEvents(SDL_VideoDevice *_this);
static void Emscripten_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window);
static bool Emscripten_SetWindowIcon(SDL_VideoDevice *_this, SDL_Window *window, SDL_Surface *icon);
static bool pumpevents_has_run = false;
static int pending_swap_interval = -1;
@@ -157,8 +158,8 @@ static SDL_VideoDevice *Emscripten_CreateDevice(void)
device->CreateSDLWindow = Emscripten_CreateWindow;
device->SetWindowTitle = Emscripten_SetWindowTitle;
/*device->SetWindowIcon = Emscripten_SetWindowIcon;
device->SetWindowPosition = Emscripten_SetWindowPosition;*/
device->SetWindowIcon = Emscripten_SetWindowIcon;
/*device->SetWindowPosition = Emscripten_SetWindowPosition;*/
device->SetWindowSize = Emscripten_SetWindowSize;
device->SetWindowResizable = Emscripten_SetWindowResizable;
/*device->ShowWindow = Emscripten_ShowWindow;
@@ -716,4 +717,53 @@ static void Emscripten_SetWindowTitle(SDL_VideoDevice *_this, SDL_Window *window
emscripten_set_window_title(window->title);
}
static bool Emscripten_SetWindowIcon(SDL_VideoDevice *_this, SDL_Window *window, SDL_Surface *icon)
{
// Create dynamic memory stream for PNG encoding
SDL_IOStream *stream = SDL_IOFromDynamicMem();
if (!stream) {
return false;
}
// Encode icon to PNG using SDL's native PNG encoder
if (!SDL_SavePNG_IO(icon, stream, false)) {
SDL_CloseIO(stream);
return false;
}
// Get the PNG data from the stream
void *png_data = SDL_GetPointerProperty(
SDL_GetIOProperties(stream),
SDL_PROP_IOSTREAM_DYNAMIC_MEMORY_POINTER,
NULL
);
size_t png_size = (size_t)SDL_GetIOSize(stream);
// Pass PNG data to JavaScript
MAIN_THREAD_EM_ASM({
var pngData = HEAPU8.subarray($0, $0 + $1);
var blob = new Blob([pngData], {type: 'image/png'});
var url = URL.createObjectURL(blob);
// Set as favicon (create link element if it doesn't exist)
var link = document.querySelector("link[rel~='icon']");
if (!link) {
link = document.createElement('link');
link.rel = 'icon';
link.type = 'image/png';
document.head.appendChild(link);
}
// Revoke old URL if it exists to prevent memory leaks
if (link.href && link.href.startsWith('blob:')) {
URL.revokeObjectURL(link.href);
}
link.href = url;
}, png_data, png_size);
SDL_CloseIO(stream);
return true;
}
#endif // SDL_VIDEO_DRIVER_EMSCRIPTEN