fix [2262591] Junk on screen in ERD46

since we're using the GPU for composition, don't use a texture for dimming,
instead simply use an alpha-blended quad.

also workaround what looks like a GL driver bug by calling glFinish() before
glReadPixels().

libs/surfaceflinger/Android.mk

@@ -22,9 +22,6 @@ LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES -DEGL_EGLEXT_PROTOTYPES
 ifeq ($(TARGET_BOARD_PLATFORM), msm7k)
 	LOCAL_CFLAGS += -DDIM_WITH_TEXTURE
 endif
-ifeq ($(TARGET_BOARD_PLATFORM), qsd8k)
-	LOCAL_CFLAGS += -DDIM_WITH_TEXTURE
-endif
 
 # need "-lrt" on Linux simulator to pick up clock_gettime
 ifeq ($(TARGET_SIMULATOR),true)

libs/surfaceflinger/LayerBlur.cpp

@@ -169,6 +169,7 @@ void LayerBlur::onDraw(const Region& clip) const
             // This reads the frame-buffer, so a h/w GL would have to
             // finish() its rendering first. we don't want to do that
             // too often. Read data is 4-bytes aligned.
+            glFinish();
             glReadPixels(X, Y, w, h, mReadFormat, mReadType, pixels);
 
             // blur that texture.