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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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docs/window.dox
-7
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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`.