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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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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
View File

@@ -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`.