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Backends: Win32: Fixed setting of io.DisplaySize to invalid/uninitialized data when after hwnd has been closed.

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GetClientRect() fails on closed hwnd which left the rectangle uninitialized and copied to DisplaySize. Ensure it is zero + similar failsafe in io.WantSetMousePos path.
This commit is contained in:
ocornut 2020-12-04 11:48:17 +01:00
parent 998d7303b1
commit f9b873662b
2 changed files with 6 additions and 4 deletions
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9
backends/imgui_impl_win32.cpp
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@ -32,6 +32,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2020-12-04: Misc: Fixed setting of io.DisplaySize to invalid/uninitialized data when after hwnd has been closed.
// 2020-03-03: Inputs: Calling AddInputCharacterUTF16() to support surrogate pairs leading to codepoint >= 0x10000 (for more complete CJK inputs)
// 2020-02-17: Added ImGui_ImplWin32_EnableDpiAwareness(), ImGui_ImplWin32_GetDpiScaleForHwnd(), ImGui_ImplWin32_GetDpiScaleForMonitor() helper functions.
// 2020-01-14: Inputs: Added support for #define IMGUI_IMPL_WIN32_DISABLE_GAMEPAD/IMGUI_IMPL_WIN32_DISABLE_LINKING_XINPUT.
@ -153,8 +154,8 @@ static void ImGui_ImplWin32_UpdateMousePos()
if (io.WantSetMousePos)
{
POINT pos = { (int)io.MousePos.x, (int)io.MousePos.y };
::ClientToScreen(g_hWnd, &pos);
::SetCursorPos(pos.x, pos.y);
if (::ClientToScreen(g_hWnd, &pos))
::SetCursorPos(pos.x, pos.y);
}
// Set mouse position
@ -221,12 +222,12 @@ void ImGui_ImplWin32_NewFrame()
IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer backend. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
// Setup display size (every frame to accommodate for window resizing)
RECT rect;
RECT rect = { 0, 0, 0, 0 };
::GetClientRect(g_hWnd, &rect);
io.DisplaySize = ImVec2((float)(rect.right - rect.left), (float)(rect.bottom - rect.top));
// Setup time step
INT64 current_time;
INT64 current_time = 0;
::QueryPerformanceCounter((LARGE_INTEGER*)&current_time);
io.DeltaTime = (float)(current_time - g_Time) / g_TicksPerSecond;
g_Time = current_time;

1
docs/CHANGELOG.txt
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@ -94,6 +94,7 @@ Other Changes:
when the later returns zero (e.g. Desktop GL 2.x). (#3530) [@xndcn]
- Backends: OpenGL3: Backup and restore GL_PRIMITIVE_RESTART state. (#3544) [@Xipiryon]
- Backends: Vulkan: Added support for specifying which subpass to reference during VkPipeline creation. (@3579) [@bdero]
- Backends: Win32: Fix setting of io.DisplaySize to invalid/uninitialized data after hwnd has been closed.
- Backends: OSX: Fix keypad-enter key not working on MacOS. (#3554) [@rokups, @lfnoise]
- Examples: Apple+Metal: Consolidated/simplified to get closer to other examples. (#3543) [@warrenm]
- Examples: Apple+Metal: Forward events down so OS key combination like Cmd+Q can work. (#3554) [@rokups]