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emscripten: force resize event when pixel ratio changes

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Without this, applications can't react to changed canvas size on window zoom.
This commit is contained in:
Sebastian Krzyszkowiak 2019-03-16 19:08:59 -07:00
parent b8bd0aa0bd
commit 6311c7cf95
1 changed files with 11 additions and 1 deletions
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10
src/video/emscripten/SDL_emscriptenevents.c
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@ -586,10 +586,14 @@ static EM_BOOL
Emscripten_HandleResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData) Emscripten_HandleResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData)
{ {
SDL_WindowData *window_data = userData; SDL_WindowData *window_data = userData;
SDL_bool force = SDL_FALSE;
/* update pixel ratio */ /* update pixel ratio */
if (window_data->window->flags & SDL_WINDOW_ALLOW_HIGHDPI) { if (window_data->window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
if (window_data->pixel_ratio != emscripten_get_device_pixel_ratio()) {
window_data->pixel_ratio = emscripten_get_device_pixel_ratio(); window_data->pixel_ratio = emscripten_get_device_pixel_ratio();
force = SDL_TRUE;
}
} }
if(!(window_data->window->flags & FULLSCREEN_MASK)) if(!(window_data->window->flags & FULLSCREEN_MASK))
@ -611,6 +615,12 @@ Emscripten_HandleResize(int eventType, const EmscriptenUiEvent *uiEvent, void *u
emscripten_set_element_css_size(NULL, w, h); emscripten_set_element_css_size(NULL, w, h);
} }
if (force) {
/* force the event to trigger, so pixel ratio changes can be handled */
window_data->window->w = 0;
window_data->window->h = 0;
}
SDL_SendWindowEvent(window_data->window, SDL_WINDOWEVENT_RESIZED, w, h); SDL_SendWindowEvent(window_data->window, SDL_WINDOWEVENT_RESIZED, w, h);
} }
} }