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hidpi-scale-wip

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This commit is contained in:
Romain Vimont 2018-09-04 20:52:07 +02:00
parent eca99d5af7
commit 2e40285244
1 changed files with 13 additions and 2 deletions
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15
app/src/screen.c
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@ -132,6 +132,17 @@ static inline struct size get_initial_optimal_size(struct size frame_size) {
return get_optimal_size(frame_size, frame_size);
}
// apply hidpi scaling and call SDL_RenderSetLogicalSize
static inline SDL_bool render_set_scaled_logical_size(struct screen *screen, struct size size) {
int w, h, dw, dh;
SDL_GL_GetDrawableSize(screen->window, &w, &h);
SDL_GetWindowSize(screen->window, &dw, &dh);
// use 32 bits unsigned not to lose precision (width and height fit in 16 bits)
int scaled_x = (Uint32) size.width * (Uint32) w / (Uint32) dw;
int scaled_y = (Uint32) size.height * (Uint32) h / (Uint32) dh;
return SDL_RenderSetLogicalSize(screen->renderer, scaled_x, scaled_y);
}
void screen_init(struct screen *screen) {
*screen = (struct screen) SCREEN_INITIALIZER;
}
@ -163,7 +174,7 @@ SDL_bool screen_init_rendering(struct screen *screen, const char *device_name, s
return SDL_FALSE;
}
if (SDL_RenderSetLogicalSize(screen->renderer, frame_size.width, frame_size.height)) {
if (render_set_scaled_logical_size(screen, frame_size)) {
LOGE("Could not set renderer logical size: %s", SDL_GetError());
screen_destroy(screen);
return SDL_FALSE;
@ -208,7 +219,7 @@ void screen_destroy(struct screen *screen) {
// recreate the texture and resize the window if the frame size has changed
static SDL_bool prepare_for_frame(struct screen *screen, struct size new_frame_size) {
if (screen->frame_size.width != new_frame_size.width || screen->frame_size.height != new_frame_size.height) {
if (SDL_RenderSetLogicalSize(screen->renderer, new_frame_size.width, new_frame_size.height)) {
if (render_set_scaled_logical_size(screen, new_frame_size)) {
LOGE("Could not set renderer logical size: %s", SDL_GetError());
return SDL_FALSE;
}