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eglfs: Add a way to force 24/32 bit configs

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Some embedded devices do not play nicely with 16-bit (565)
EGL configurations, resulting in ugly banding in Quick apps.
Add a QT_QPA_EGLFS_FORCE888 environment variable that can be
set on systems where it is known that only 24 or 32 bit configs
provide acceptable results.

Change-Id: I7b8d7b9a2cd40b51a844d0795b7156b735e18ebb
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
This commit is contained in:
Laszlo Agocs 2014-03-24 20:03:22 +01:00 committed by The Qt Project
parent dc685cf633
commit 11a6270079
1 changed files with 10 additions and 1 deletions
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11
src/plugins/platforms/eglfs/qeglfshooks_stub.cpp
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@ -141,7 +141,16 @@ QImage::Format QEglFSHooks::screenFormat() const
QSurfaceFormat QEglFSHooks::surfaceFormatFor(const QSurfaceFormat &inputFormat) const
{
return inputFormat;
QSurfaceFormat format = inputFormat;
static const bool force888 = qgetenv("QT_QPA_EGLFS_FORCE888").toInt();
if (force888) {
format.setRedBufferSize(8);
format.setGreenBufferSize(8);
format.setBlueBufferSize(8);
}
return format;
}
bool QEglFSHooks::filterConfig(EGLDisplay, EGLConfig) const