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video: Added a hint to override the display's usable bounds.

This commit is contained in:
Ryan C. Gordon 2020-01-27 10:58:30 -05:00
parent 7ea3f5b464
commit b4c2e29eed
2 changed files with 27 additions and 1 deletions
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14
include/SDL_hints.h
View File

@ -1229,6 +1229,20 @@ extern "C" {
*/
#define SDL_HINT_WAVE_FACT_CHUNK "SDL_WAVE_FACT_CHUNK"
/*
* \brief Override for SDL_GetDisplayUsableBounds()
*
* If set, this hint will override the expected results for
* SDL_GetDisplayUsableBounds() for display index 0. Generally you don't want
* to do this, but this allows an embedded system to request that some of the
* screen be reserved for other uses when paired with a well-behaved
* application.
*
* The contents of this hint must be 4 comma-separated integers, the first
* is the bounds x, then y, width and height, in that order.
*/
#define SDL_HINT_DISPLAY_USABLE_BOUNDS "SDL_DISPLAY_USABLE_BOUNDS"
/**
* \brief An enumeration of hint priorities
*/

14
src/video/SDL_video.c
View File

@ -706,13 +706,25 @@ SDL_GetDisplayBounds(int displayIndex, SDL_Rect * rect)
return 0; /* !!! FIXME: should this be an error if (rect==NULL) ? */
}
int SDL_GetDisplayUsableBounds(int displayIndex, SDL_Rect * rect)
static int
ParseDisplayUsableBoundsHint(SDL_Rect *rect)
{
const char *hint = SDL_GetHint(SDL_HINT_DISPLAY_USABLE_BOUNDS);
return hint && (SDL_sscanf(hint, "%d,%d,%d,%d", &rect->x, &rect->y, &rect->w, &rect->h) == 4);
}
int
SDL_GetDisplayUsableBounds(int displayIndex, SDL_Rect * rect)
{
CHECK_DISPLAY_INDEX(displayIndex, -1);
if (rect) {
SDL_VideoDisplay *display = &_this->displays[displayIndex];
if ((displayIndex == 0) && ParseDisplayUsableBoundsHint(rect)) {
return 0;
}
if (_this->GetDisplayUsableBounds) {
if (_this->GetDisplayUsableBounds(_this, display, rect) == 0) {
return 0;