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Add and event and flag to report when a window has been occluded

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Adds the SDL_EVENT_WINDOW_OCCLUDED events and the window flag SDL_WINDOW_OCCLUDED to report when the window occlusion state has changed, so that the application can take appropriate measures, as it may wish to suspend drawing, throttle, or otherwise behave in a more energy efficient manner when the window is not visible. When the window is no longer occluded, the SDL_EVENT_WINDOW_EXPOSED event is sent and the occlusion flag is cleared.

This is handled on macOS via the window occlusion state event (available as of 10.9), and via the xdg-shell protocol on Wayland (version 6, wayland-protocols 1.32, passed through in libdecor 0.1.2).
This commit is contained in:
Frank Praznik
2023-06-19 12:47:11 -04:00
parent 7aec9ad4a6
commit 44536b7537
12 changed files with 303 additions and 89 deletions
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14
cmake/sdlchecks.cmake
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@@ -571,16 +571,10 @@ macro(CheckWayland)
list(APPEND SDL_EXTRA_LIBS ${PKG_LIBDECOR_LIBRARIES})
endif()
cmake_push_check_state()
list(APPEND CMAKE_REQUIRED_FLAGS ${PKG_LIBDECOR_CFLAGS})
list(APPEND CMAKE_REQUIRED_INCLUDES ${PKG_LIBDECOR_INCLUDE_DIRS})
list(APPEND CMAKE_REQUIRED_LIBRARIES ${PKG_LIBDECOR_LINK_LIBRARIES})
check_symbol_exists(libdecor_frame_get_max_content_size "libdecor.h" HAVE_LIBDECOR_FRAME_GET_MAX_CONTENT_SIZE)
check_symbol_exists(libdecor_frame_get_min_content_size "libdecor.h" HAVE_LIBDECOR_FRAME_GET_MIN_CONTENT_SIZE)
if(HAVE_LIBDECOR_FRAME_GET_MAX_CONTENT_SIZE AND HAVE_LIBDECOR_FRAME_GET_MIN_CONTENT_SIZE)
set(SDL_HAVE_LIBDECOR_GET_MIN_MAX 1)
endif()
cmake_pop_check_state()
# Version 0.1.2 or higher is needed for suspended window state and statically linked min/max getters.
if (PKG_LIBDECOR_VERSION VERSION_GREATER_EQUAL "0.1.2")
set(SDL_HAVE_LIBDECOR_VER_0_1_2 1)
endif ()
endif()
endif()