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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.
This commit is contained in:
Camilla Löwy 2020-07-28 00:12:45 +02:00
parent a2674a9034
commit 05dd2fa298
6 changed files with 52 additions and 46 deletions
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2
README.md
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@ -143,6 +143,8 @@ information on what to include when reporting a bug.
- [Win32] Added the `GLFW_WIN32_KEYBOARD_MENU` window hint for enabling access
to the window menu
- [Win32] Added a version info resource to the GLFW DLL
- [Win32] Disabled framebuffer transparency on Windows 7 when DWM windows are
opaque (#1512)
- [Win32] Bugfix: `GLFW_INCLUDE_VULKAN` plus `VK_USE_PLATFORM_WIN32_KHR` caused
symbol redefinition (#1524)
- [Win32] Bugfix: The cursor position event was emitted before its cursor enter

7
docs/news.dox
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@ -97,6 +97,13 @@ GLFW no longer depends on the CoreVideo framework on macOS and it no longer
needs to be specified during compilation or linking.
@subsubsection caveat_fbtransparency_34 Framebuffer transparency requires DWM transparency
GLFW no longer supports framebuffer transparency enabled via @ref
GLFW_TRANSPARENT_FRAMEBUFFER on Windows 7 if DWM transparency is off
(the Transparency setting under Personalization > Window Color).
@subsection deprecations_34 Deprecations in version 3.4
@subsection removals_34 Removals in 3.4

7
docs/window.dox
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@ -234,13 +234,6 @@ alpha channel will be used to combine the framebuffer with the background. This
does not affect window decorations. Possible values are `GLFW_TRUE` and
`GLFW_FALSE`.
@par
@win32 GLFW sets a color key for the window to work around repainting issues
with a transparent framebuffer. The chosen color value is RGB 255,0,255
(magenta). This will make pixels with that exact color fully transparent
regardless of their alpha values. If this is a problem, make these pixels any
other color before buffer swap.
@anchor GLFW_FOCUS_ON_SHOW_hint
__GLFW_FOCUS_ON_SHOW__ specifies whether the window will be given input
focus when @ref glfwShowWindow is called. Possible values are `GLFW_TRUE` and `GLFW_FALSE`.

2
src/win32_init.c
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@ -143,6 +143,8 @@ static GLFWbool loadLibraries(void)
GetProcAddress(_glfw.win32.dwmapi.instance, "DwmFlush");
_glfw.win32.dwmapi.EnableBlurBehindWindow = (PFN_DwmEnableBlurBehindWindow)
GetProcAddress(_glfw.win32.dwmapi.instance, "DwmEnableBlurBehindWindow");
_glfw.win32.dwmapi.GetColorizationColor = (PFN_DwmGetColorizationColor)
GetProcAddress(_glfw.win32.dwmapi.instance, "DwmGetColorizationColor");
}
_glfw.win32.shcore.instance = LoadLibraryA("shcore.dll");

6
src/win32_platform.h
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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
@ -244,9 +247,11 @@ 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);
@ -368,6 +373,7 @@ typedef struct _GLFWlibraryWin32
PFN_DwmIsCompositionEnabled IsCompositionEnabled;
PFN_DwmFlush Flush;
PFN_DwmEnableBlurBehindWindow EnableBlurBehindWindow;
PFN_DwmGetColorizationColor GetColorizationColor;
} dwmapi;
struct {

74
src/win32_window.c
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@ -377,12 +377,17 @@ static void updateWindowStyles(const _GLFWwindow* window)
//
static void updateFramebufferTransparency(const _GLFWwindow* window)
{
BOOL enabled;
BOOL composition, opaque;
DWORD color;
if (!IsWindowsVistaOrGreater())
return;
if (SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled)
if (FAILED(DwmIsCompositionEnabled(&composition)) || !composition)
return;
if (IsWindows8OrGreater() ||
(SUCCEEDED(DwmGetColorizationColor(&color, &opaque)) && !opaque))
{
HRGN region = CreateRectRgn(0, 0, -1, -1);
DWM_BLURBEHIND bb = {0};
@ -390,42 +395,18 @@ static void updateFramebufferTransparency(const _GLFWwindow* window)
bb.hRgnBlur = region;
bb.fEnable = TRUE;
if (SUCCEEDED(DwmEnableBlurBehindWindow(window->win32.handle, &bb)))
{
// Decorated windows don't repaint the transparent background
// leaving a trail behind animations
// HACK: Making the window layered with a transparency color key
// seems to fix this. Normally, when specifying
// a transparency color key to be used when composing the
// layered window, all pixels painted by the window in this
// color will be transparent. That doesn't seem to be the
// case anymore, at least when used with blur behind window
// plus negative region.
LONG exStyle = GetWindowLongW(window->win32.handle, GWL_EXSTYLE);
exStyle |= WS_EX_LAYERED;
SetWindowLongW(window->win32.handle, GWL_EXSTYLE, exStyle);
// Using a color key not equal to black to fix the trailing
// issue. When set to black, something is making the hit test
// not resize with the window frame.
SetLayeredWindowAttributes(window->win32.handle,
RGB(255, 0, 255), 255, LWA_COLORKEY);
}
DwmEnableBlurBehindWindow(window->win32.handle, &bb);
DeleteObject(region);
}
else
{
LONG exStyle = GetWindowLongW(window->win32.handle, GWL_EXSTYLE);
if (exStyle & WS_EX_TRANSPARENT)
SetLayeredWindowAttributes(window->win32.handle, 0, 0, 0);
else
{
exStyle &= ~WS_EX_LAYERED;
SetWindowLongW(window->win32.handle, GWL_EXSTYLE, exStyle);
RedrawWindow(window->win32.handle, NULL, NULL,
RDW_ERASE | RDW_INVALIDATE | RDW_FRAME);
}
// HACK: Disable framebuffer transparency on Windows 7 when the
// colorization color is opaque, because otherwise the window
// contents is blended additively with the previous frame instead
// of replacing it
DWM_BLURBEHIND bb = {0};
bb.dwFlags = DWM_BB_ENABLE;
DwmEnableBlurBehindWindow(window->win32.handle, &bb);
}
}
@ -1109,6 +1090,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
}
case WM_DWMCOMPOSITIONCHANGED:
case WM_DWMCOLORIZATIONCOLORCHANGED:
{
if (window->win32.transparent)
updateFramebufferTransparency(window);
@ -1834,7 +1816,8 @@ int _glfwPlatformWindowHovered(_GLFWwindow* window)
int _glfwPlatformFramebufferTransparent(_GLFWwindow* window)
{
BOOL enabled;
BOOL composition, opaque;
DWORD color;
if (!window->win32.transparent)
return GLFW_FALSE;
@ -1842,7 +1825,20 @@ int _glfwPlatformFramebufferTransparent(_GLFWwindow* window)
if (!IsWindowsVistaOrGreater())
return GLFW_FALSE;
return SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled;
if (FAILED(DwmIsCompositionEnabled(&composition)) || !composition)
return GLFW_FALSE;
if (!IsWindows8OrGreater())
{
// HACK: Disable framebuffer transparency on Windows 7 when the
// colorization color is opaque, because otherwise the window
// contents is blended additively with the previous frame instead
// of replacing it
if (FAILED(DwmGetColorizationColor(&color, &opaque)) || opaque)
return GLFW_FALSE;
}
return GLFW_TRUE;
}
void _glfwPlatformSetWindowResizable(_GLFWwindow* window, GLFWbool enabled)
@ -1877,11 +1873,11 @@ void _glfwPlatformSetWindowMousePassthrough(_GLFWwindow* window, GLFWbool enable
else
{
exStyle &= ~WS_EX_TRANSPARENT;
// NOTE: Window opacity and framebuffer transparency also need to
// control the layered style so avoid stepping on their feet
// NOTE: Window opacity also needs the layered window style so do not
// remove it if the window is alpha blended
if (exStyle & WS_EX_LAYERED)
{
if (!(flags & (LWA_ALPHA | LWA_COLORKEY)))
if (!(flags & LWA_ALPHA))
exStyle &= ~WS_EX_LAYERED;
}
}