diff options
| -rw-r--r-- | services/surfaceflinger/SurfaceFlinger.cpp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp index 26e9c60..7ee6e5e 100644 --- a/services/surfaceflinger/SurfaceFlinger.cpp +++ b/services/surfaceflinger/SurfaceFlinger.cpp @@ -1500,6 +1500,28 @@ void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const drawWormhole(hw, region); } } + + if (hw->getDisplayType() >= DisplayDevice::DISPLAY_EXTERNAL) { + // TODO: just to be on the safe side, we don't set the + // scissor on the main display. It should never be needed + // anyways (though in theory it could since the API allows it). + const Rect& bounds(hw->getBounds()); + const Transform& tr(hw->getTransform()); + const Rect scissor(tr.transform(hw->getViewport())); + if (scissor != bounds) { + // scissor doesn't match the screen's dimensions, so we + // need to clear everything outside of it and enable + // the GL scissor so we don't draw anything where we shouldn't + const GLint height = hw->getHeight(); + glScissor(scissor.left, height - scissor.bottom, + scissor.getWidth(), scissor.getHeight()); + // clear everything unscissored + glClearColor(0, 0, 0, 0); + glClear(GL_COLOR_BUFFER_BIT); + // enable scissor for this frame + glEnable(GL_SCISSOR_TEST); + } + } } /* @@ -1552,6 +1574,9 @@ void SurfaceFlinger::doComposeSurfaces(const sp<const DisplayDevice>& hw, const } } } + + // disable scissor at the end of the frame + glDisable(GL_SCISSOR_TEST); } void SurfaceFlinger::drawWormhole(const sp<const DisplayDevice>& hw, |