Fixed rendering errors in blurpicker with -graphicssystem opengl

1) Need to transfer to brush drawing mode when switching active engine,
to make sure we reset the vertex / texture coordinate pointers for image
drawing.

2) QGLPixmapGLPaintDevice::beginPaint() was changed to use
QGLContext::drawTexture() for blitting the old texture contents to the
render FBO, which means that we also need to set up viewport, modelview,
and projection matrices, and ensure that clipping / stencil testing
is disabled.

3) Make sure stencil testing is disabled when clearing the FBO.

Reviewed-by: Tom

0 files changed, 0 insertions, 0 deletions