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rpi video - Use dispmanx scaling (#1)

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* Use dispmanx scaling
* There is the new SDL hint SDL_VIDEO_RPI_SCALE_MODE. There are three values.
 * The variable can be set to the following values:
 *   "0"       - Window resolution is desktop resolution.
 *               This is the behaviour of SDL <= 2.0.4. (default)
 *   "1"       - Requested video resolution will be scaled to desktop resolution.
 *               Aspect ratio of requested video resolution will be respected.
 *   "2"       - Requested video resolution will be scaled to desktop resolution
 *   "3"       - Integer scaling. dst_rect is an integral multiple of src_rect. Should prevent scaling artifacts.
* Add aspect ratio hint
This commit is contained in:
Stefan 2016-07-06 21:53:43 +02:00 • committed by Jools Wills
parent 9a90520563
commit e24d1ccab6
2 changed files with 106 additions and 10 deletions
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27
include/SDL_hints.h
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@ -790,6 +790,33 @@ extern "C" {
*/
#define SDL_HINT_NO_SIGNAL_HANDLERS "SDL_NO_SIGNAL_HANDLERS"
/**
* \brief Tell dispmanx to stretch the SDL window to fill the display.
*
* This hint only applies to the rpi video driver.
*
* The variable can be set to the following values:
* "0" - Window resolution is desktop resolution.
* This is the behaviour of SDL <= 2.0.4. (default)
* "1" - Requested video resolution will be scaled to desktop resolution.
* Aspect ratio of requested video resolution will be respected.
* "2" - Requested video resolution will be scaled to desktop resolution.
* "3" - Requested video resolution will be scaled to desktop resolution.
* Aspect ratio of requested video resolution will be respected.
* If possible output resolution will be integral multiple of video
* resolution.
*/
#define SDL_HINT_VIDEO_RPI_SCALE_MODE "SDL_VIDEO_RPI_SCALE_MODE"
/**
* \brief Tell dispmanx to set a specific aspect ratio.
*
* This hint only applies to the rpi video driver.
*
* Must be set together with SDL_HINT_VIDEO_RPI_SCALE_MODE=1.
*/
#define SDL_HINT_VIDEO_RPI_RATIO "SDL_VIDEO_RPI_RATIO"
/**
* \brief Tell SDL not to generate window-close events for Alt+F4 on Windows.
*