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wayland: Work around a GNOME xdg_output scaling issue

This commit is contained in:
Ethan Lee 2022-03-26 19:55:04 -04:00
parent 94ed6b0a54
commit 40417b188a
2 changed files with 22 additions and 3 deletions
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24
src/video/wayland/SDL_waylandvideo.c
View File

@ -294,6 +294,7 @@ xdg_output_handle_logical_position(void *data, struct zxdg_output_v1 *xdg_output
driverdata->x = x;
driverdata->y = y;
driverdata->has_logical_position = SDL_TRUE;
}
static void
@ -302,8 +303,25 @@ xdg_output_handle_logical_size(void *data, struct zxdg_output_v1 *xdg_output,
{
SDL_WaylandOutputData* driverdata = data;
if (driverdata->width != 0 && driverdata->height != 0) {
/* FIXME: GNOME has a bug where the logical size does not account for
* scale, resulting in bogus viewport sizes.
*
* Until this is fixed, validate the scale, then override if necessary.
* -flibit
*/
const float scale = (float) driverdata->width / (float) width;
if (scale != driverdata->scale_factor) {
SDL_LogWarn(
SDL_LOG_CATEGORY_VIDEO,
"xdg_output scale did not match, overriding with wl_output scale"
);
return;
}
}
driverdata->width = width;
driverdata->height = height;
driverdata->has_logical_size = SDL_TRUE;
}
static void
@ -371,7 +389,7 @@ display_handle_geometry(void *data,
}
/* Apply the change from wl-output only if xdg-output is not supported */
if (driverdata->xdg_output) {
if (driverdata->has_logical_position) {
driverdata->x = x;
driverdata->y = y;
}
@ -428,7 +446,7 @@ display_handle_mode(void *data,
* Don't rotate this yet, wl-output coordinates are transformed in
* handle_done and xdg-output coordinates are pre-transformed.
*/
if (!driverdata->xdg_output) {
if (!driverdata->has_logical_size) {
driverdata->width = width;
driverdata->height = height;
}
@ -485,7 +503,7 @@ display_handle_done(void *data,
SDL_zero(mode);
mode.format = SDL_PIXELFORMAT_RGB888;
if (driverdata->xdg_output) {
if (driverdata->has_logical_size) {
/* xdg-output dimensions are already transformed, so no need to rotate. */
mode.w = driverdata->width;
mode.h = driverdata->height;

1
src/video/wayland/SDL_waylandvideo.h
View File

@ -105,6 +105,7 @@ struct SDL_WaylandOutputData {
SDL_DisplayOrientation orientation;
int physical_width, physical_height;
float ddpi, hdpi, vdpi;
SDL_bool has_logical_position, has_logical_size;
int index;
SDL_VideoDisplay placeholder;
int wl_output_done_count;