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Win32: Disable fb transparency when it is broken

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On Windows 7, when GLFW framebuffer transparency and the DWM are enabled
but DWM transparency is disabled (i.e. when the Transparency setting is
disabled under Personalization > Color), the contents of the framebuffer
is combined with the last frame using additive blending instead of
replacing the previous contents.

This commit limits GLFW framebuffer transparency on Windows 7 to when
DWM transparency is enabled, removing the previous workaround of setting
a layered window color key that led to rendering artifacts.

Fixes #1512.

(cherry picked from commit 05dd2fa298)
This commit is contained in:
Camilla Löwy
2020-07-28 00:12:45 +02:00
parent b8a6254a26
commit 8363179eee
6 changed files with 49 additions and 38 deletions
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src/win32_platform.h
+6
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@@ -77,6 +77,9 @@
#ifndef WM_DWMCOMPOSITIONCHANGED
#define WM_DWMCOMPOSITIONCHANGED 0x031E
#endif
#ifndef WM_DWMCOLORIZATIONCOLORCHANGED
#define WM_DWMCOLORIZATIONCOLORCHANGED 0x0320
#endif
#ifndef WM_COPYGLOBALDATA
#define WM_COPYGLOBALDATA 0x0049
#endif
@@ -247,9 +250,11 @@ typedef BOOL (WINAPI * PFN_AdjustWindowRectExForDpi)(LPRECT,DWORD,BOOL,DWORD,UIN
typedef HRESULT (WINAPI * PFN_DwmIsCompositionEnabled)(BOOL*);
typedef HRESULT (WINAPI * PFN_DwmFlush)(VOID);
typedef HRESULT(WINAPI * PFN_DwmEnableBlurBehindWindow)(HWND,const DWM_BLURBEHIND*);
typedef HRESULT (WINAPI * PFN_DwmGetColorizationColor)(DWORD*,BOOL*);
#define DwmIsCompositionEnabled _glfw.win32.dwmapi.IsCompositionEnabled
#define DwmFlush _glfw.win32.dwmapi.Flush
#define DwmEnableBlurBehindWindow _glfw.win32.dwmapi.EnableBlurBehindWindow
#define DwmGetColorizationColor _glfw.win32.dwmapi.GetColorizationColor
// shcore.dll function pointer typedefs
typedef HRESULT (WINAPI * PFN_SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS);
@@ -375,6 +380,7 @@ typedef struct _GLFWlibraryWin32
PFN_DwmIsCompositionEnabled IsCompositionEnabled;
PFN_DwmFlush Flush;
PFN_DwmEnableBlurBehindWindow EnableBlurBehindWindow;
PFN_DwmGetColorizationColor GetColorizationColor;
} dwmapi;
struct {