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Backends: SDL: Avoid calling SDL_SetCursor() when cursor has not changed. (#6113)

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This commit is contained in:
ocornut 2023-02-02 21:28:28 +01:00
parent 46efed8b70
commit 6584de4a78
2 changed files with 12 additions and 2 deletions
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10
backends/imgui_impl_sdl.cpp
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@ -18,6 +18,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2023-02-02: Avoid calling SDL_SetCursor() when cursor has not changed, as the function is surprisingly costly on Mac with latest SDL (may be fixed in next SDL version).
// 2023-02-02: Added support for SDL 2.0.18+ preciseX/preciseY mouse wheel data for smooth scrolling + Scaling X value on Emscripten (bug?). (#4019, #6096)
// 2023-02-02: Removed SDL_MOUSEWHEEL value clamping, as values seem correct in latest Emscripten. (#4019)
// 2023-02-01: Flipping SDL_MOUSEWHEEL 'wheel.x' value to match other backends and offer consistent horizontal scrolling direction. (#4019, #6096, #1463)
@ -91,6 +92,7 @@ struct ImGui_ImplSDL2_Data
Uint64 Time;
int MouseButtonsDown;
SDL_Cursor* MouseCursors[ImGuiMouseCursor_COUNT];
SDL_Cursor* LastMouseCursor;
int PendingMouseLeaveFrame;
char* ClipboardTextData;
bool MouseCanUseGlobalState;
@ -439,6 +441,7 @@ void ImGui_ImplSDL2_Shutdown()
SDL_free(bd->ClipboardTextData);
for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
SDL_FreeCursor(bd->MouseCursors[cursor_n]);
bd->LastMouseCursor = NULL;
io.BackendPlatformName = nullptr;
io.BackendPlatformUserData = nullptr;
@ -492,7 +495,12 @@ static void ImGui_ImplSDL2_UpdateMouseCursor()
else
{
// Show OS mouse cursor
SDL_SetCursor(bd->MouseCursors[imgui_cursor] ? bd->MouseCursors[imgui_cursor] : bd->MouseCursors[ImGuiMouseCursor_Arrow]);
SDL_Cursor* expected_cursor = bd->MouseCursors[imgui_cursor] ? bd->MouseCursors[imgui_cursor] : bd->MouseCursors[ImGuiMouseCursor_Arrow];
if (bd->LastMouseCursor != expected_cursor)
{
SDL_SetCursor(expected_cursor); // SDL function doesn't have an early out (see #6113)
bd->LastMouseCursor = expected_cursor;
}
SDL_ShowCursor(SDL_TRUE);
}
}

4
docs/CHANGELOG.txt
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@ -92,7 +92,9 @@ All changes:
- Backends: SDL: Removed SDL_MOUSEWHEEL value clamping. (#4019, #6096, #6081)
- Backends: SDL: Added support for SDL 2.0.18+ preciseX/preciseY mouse wheel data
for smooth scrolling as reported by SDL. (#4019, #6096)
- Backend: WebGPU: Fix building for latest WebGPU specs (remove implicit layout generation).
- Backends: SDL: Avoid calling SDL_SetCursor() when cursor has not changed, as the function
is surprisingly costly on Mac with latest SDL (may be fixed in next SDL version). (#6113)
- Backends: WebGPU: Fix building for latest WebGPU specs (remove implicit layout generation).
(#6117, #4116, #3632) [@tonygrue, @bfierz]
- Examples: refactord all examples to use a "MainLoopStep()" function. This is in order
to be able to trivially make some compile with Emscripten. (#2492, #3699)