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Updated SDL high DPI support

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We have gotten feedback that abstracting the coordinate system based on the display scale is unexpected and it is difficult to adapt existing applications to the proposed API.

The new approach is to provide the coordinate systems that people expect, but provide additional information that will help applications properly handle high DPI situations.

The concepts needed for high DPI support are documented in README-highdpi.md. An example of automatically adapting the content to display scale changes can be found in SDL_test_common.c, where auto_scale_content is checked.

Also, the SDL_WINDOW_ALLOW_HIGHDPI window flag has been replaced by the SDL_HINT_VIDEO_ENABLE_HIGH_PIXEL_DENSITY hint.

Fixes https://github.com/libsdl-org/SDL/issues/7709
This commit is contained in:
Sam Lantinga
2023-05-16 16:29:52 -07:00
parent 0fbb9c779c
commit c699f3d1d8
51 changed files with 506 additions and 882 deletions
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5
include/SDL3/SDL_events.h
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@@ -95,9 +95,9 @@ typedef enum
SDL_EVENT_DISPLAY_CONNECTED, /**< Display has been added to the system */
SDL_EVENT_DISPLAY_DISCONNECTED, /**< Display has been removed from the system */
SDL_EVENT_DISPLAY_MOVED, /**< Display has changed position */
SDL_EVENT_DISPLAY_SCALE_CHANGED, /**< Display has changed desktop display scale */
SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED, /**< Display has changed content scale */
SDL_EVENT_DISPLAY_FIRST = SDL_EVENT_DISPLAY_ORIENTATION,
SDL_EVENT_DISPLAY_LAST = SDL_EVENT_DISPLAY_SCALE_CHANGED,
SDL_EVENT_DISPLAY_LAST = SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED,
/* Window events */
/* 0x200 was SDL_WINDOWEVENT, reserve the number for sdl2-compat */
@@ -120,6 +120,7 @@ typedef enum
SDL_EVENT_WINDOW_HIT_TEST, /**< Window had a hit test that wasn't SDL_HITTEST_NORMAL */
SDL_EVENT_WINDOW_ICCPROF_CHANGED, /**< The ICC profile of the window's display has changed */
SDL_EVENT_WINDOW_DISPLAY_CHANGED, /**< Window has been moved to display data1 */
SDL_EVENT_WINDOW_DISPLAY_SCALE_CHANGED, /**< Window display scale has been changed */
SDL_EVENT_WINDOW_DESTROYED, /**< The window with the associated ID is being or has been destroyed. If this message is being handled
in an event watcher, the window handle is still valid and can still be used to retrieve any userdata
associated with the window. Otherwise, the handle has already been destroyed and all resources