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Use render output size to compute content location

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The coordinates of the content to render depend on the render output
size, not the window size in pixels. In theory, the two could differ.
This commit is contained in:
Romain Vimont
2026-01-24 22:41:33 +01:00
parent fb96497c1e
commit 41e80ae249
3 changed files with 37 additions and 16 deletions
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31
app/src/screen.c
View File

@@ -148,34 +148,33 @@ sc_screen_update_content_rect(struct sc_screen *screen) {
assert(screen->video);
struct sc_size content_size = screen->content_size;
// The drawable size is the window size * the HiDPI scale
struct sc_size drawable_size =
sc_sdl_get_window_size_in_pixels(screen->window);
struct sc_size render_size =
sc_sdl_get_render_output_size(screen->renderer);
SDL_Rect *rect = &screen->rect;
if (is_optimal_size(drawable_size, content_size)) {
if (is_optimal_size(render_size, content_size)) {
rect->x = 0;
rect->y = 0;
rect->w = drawable_size.width;
rect->h = drawable_size.height;
rect->w = render_size.width;
rect->h = render_size.height;
return;
}
bool keep_width = content_size.width * drawable_size.height
> content_size.height * drawable_size.width;
bool keep_width = content_size.width * render_size.height
> content_size.height * render_size.width;
if (keep_width) {
rect->x = 0;
rect->w = drawable_size.width;
rect->h = drawable_size.width * content_size.height
/ content_size.width;
rect->y = (drawable_size.height - rect->h) / 2;
rect->w = render_size.width;
rect->h = render_size.width * content_size.height
/ content_size.width;
rect->y = (render_size.height - rect->h) / 2;
} else {
rect->y = 0;
rect->h = drawable_size.height;
rect->w = drawable_size.height * content_size.width
/ content_size.height;
rect->x = (drawable_size.width - rect->w) / 2;
rect->h = render_size.height;
rect->w = render_size.height * content_size.width
/ content_size.height;
rect->x = (render_size.width - rect->w) / 2;
}
}

19
app/src/util/sdl.c
View File

@@ -130,6 +130,25 @@ sc_sdl_hide_window(SDL_Window *window) {
}
}
struct sc_size
sc_sdl_get_render_output_size(SDL_Renderer *renderer) {
int width;
int height;
bool ok = SDL_GetRenderOutputSize(renderer, &width, &height);
if (!ok) {
LOGE("Could not get render output size: %s", SDL_GetError());
LOGE("Please report the error");
// fatal error
abort();
}
struct sc_size size = {
.width = width,
.height = height,
};
return size;
}
bool
sc_sdl_render_clear(SDL_Renderer *renderer) {
bool ok = SDL_RenderClear(renderer);

3
app/src/util/sdl.h
View File

@@ -34,6 +34,9 @@ sc_sdl_show_window(SDL_Window *window);
void
sc_sdl_hide_window(SDL_Window *window);
struct sc_size
sc_sdl_get_render_output_size(SDL_Renderer *renderer);
bool
sc_sdl_render_clear(SDL_Renderer *renderer);