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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/news.dox
+7
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@@ -299,6 +299,13 @@ a requirement of the GLFW CMake files. The GLFW source files do not depend on
CMake.
@subsubsection caveat_fbtransparency_33 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_33 Deprecations in version 3.3
@subsubsection charmods_callback_33 Character with modifiers callback