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Align the content rectangle to physical pixels

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Centering unscaled content should not cause blurring due to pixel
misalignment.
This commit is contained in:
Romain Vimont
2026-05-08 18:49:41 +02:00
parent 85919fe5ab
commit c58b1c3fa2
1 changed files with 7 additions and 1 deletions
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8
app/src/screen.c
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@@ -271,12 +271,15 @@ sc_screen_render(struct sc_screen *screen, bool update_content_rect) {
bool ok = false;
if (orientation == SC_ORIENTATION_0) {
// always align to a physical pixel
geometry.x = (int32_t) geometry.x;
geometry.y = (int32_t) geometry.y;
ok = SDL_RenderTexture(renderer, texture, NULL, &geometry);
} else {
unsigned cw_rotation = sc_orientation_get_rotation(orientation);
double angle = 90 * cw_rotation;
const SDL_FRect *dstrect = NULL;
SDL_FRect *dstrect = NULL;
SDL_FRect rect;
if (sc_orientation_is_swap(orientation)) {
rect.x = geometry.x + (geometry.w - geometry.h) / 2.f;
@@ -291,6 +294,9 @@ sc_screen_render(struct sc_screen *screen, bool update_content_rect) {
SDL_FlipMode flip = sc_orientation_is_mirror(orientation)
? SDL_FLIP_HORIZONTAL : 0;
// always align to a physical pixel
dstrect->x = (int32_t) dstrect->x;
dstrect->y = (int32_t) dstrect->y;
ok = SDL_RenderTextureRotated(renderer, texture, NULL, dstrect, angle,
NULL, flip);
}