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Move raster position relatively using glBitmap() rather

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than using glRasterPos2f() - the latter causes drawing
artefacts at the bottom screen edge with some gfx cards


svn path=/branches/work/kwin_composite/; revision=627525
This commit is contained in:
Luboš Luňák 2007-01-26 22:50:31 +00:00
parent 8669b298be
commit e0ed5d5f3f
1 changed files with 10 additions and 1 deletions
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11
scene_opengl.cpp
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@ -495,14 +495,23 @@ void SceneOpenGL::flushBuffer( int mask, QRegion damage )
{ // no idea why glScissor() is used, but Compiz has it and it doesn't seem to hurt
glEnable( GL_SCISSOR_TEST );
glDrawBuffer( GL_FRONT );
int xpos = 0;
int ypos = 0;
foreach( QRect r, damage.rects())
{
// convert to OpenGL coordinates
int y = displayHeight() - r.y() - r.height();
glRasterPos2f( r.x(), r.y() + r.height());
// Move raster position relatively using glBitmap() rather
// than using glRasterPos2f() - the latter causes drawing
// artefacts at the bottom screen edge with some gfx cards
// glRasterPos2f( r.x(), r.y() + r.height());
glBitmap( 0, 0, 0, 0, r.x() - xpos, y - ypos, NULL );
xpos = r.x();
ypos = y;
glScissor( r.x(), y, r.width(), r.height());
glCopyPixels( r.x(), y, r.width(), r.height(), GL_COLOR );
}
glBitmap( 0, 0, 0, 0, -xpos, -ypos, NULL ); // move position back to 0,0
glDrawBuffer( GL_BACK );
glDisable( GL_SCISSOR_TEST );
}