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Add --render-fit feature

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Add an option to configure how the rendering fits the window.

The default, `--render-fit=letterbox`, preserves the aspect ratio
and fits the window as best as possible, adding black bars at
the top/bottom or left/right if needed. This has been the only behavior
scrcpy supported so far.

Another mode, `--render-fit=disabled`, renders the display at the
top-left corner without scaling. This mode will be useful for virtual
display resizing.
This commit is contained in:
Romain Vimont 2026-04-07 21:14:48 +02:00
parent 3b068b669e
commit f7c5f71ea0
9 changed files with 76 additions and 2 deletions
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14
app/src/screen.c
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@ -158,7 +158,16 @@ sc_screen_is_relative_mode(struct sc_screen *screen) {
static void
compute_content_rect(struct sc_size render_size, struct sc_size content_size,
bool can_upscale, SDL_FRect *rect) {
bool can_upscale, enum sc_render_fit render_fit,
SDL_FRect *rect) {
if (render_fit == SC_RENDER_FIT_DISABLED) {
rect->x = 0;
rect->y = 0;
rect->w = content_size.width;
rect->h = content_size.height;
return;
}
if (is_optimal_size(render_size, content_size)) {
rect->x = 0;
rect->y = 0;
@ -202,7 +211,7 @@ sc_screen_update_content_rect(struct sc_screen *screen) {
struct sc_size render_size =
sc_sdl_get_render_output_size(screen->renderer);
compute_content_rect(render_size, screen->content_size, can_upscale,
&screen->rect);
screen->render_fit, &screen->rect);
}
// render the texture to the renderer
@ -406,6 +415,7 @@ sc_screen_init(struct sc_screen *screen,
screen->video = params->video;
screen->camera = params->camera;
screen->window_aspect_ratio_lock = params->window_aspect_ratio_lock;
screen->render_fit = params->render_fit;
screen->req.x = params->window_x;
screen->req.y = params->window_y;