Fix for 2 parallel gpu rendering issues (bigbitmaprect & image-surface)

https://codereview.appspot.com/6816079/



git-svn-id: http://skia.googlecode.com/svn/trunk@6266 2bbb7eff-a529-9590-31e7-b0007b416f81

gm/gm.cpp

@@ -40,7 +40,7 @@ void GM::setBGColor(SkColor color) {
 }
 
 void GM::onDrawBackground(SkCanvas* canvas) {
-    canvas->drawColor(fBGColor);
+    canvas->drawColor(fBGColor, SkXfermode::kSrc_Mode);
 }
 
 void GM::drawSizeBounds(SkCanvas* canvas, SkColor color) {

src/gpu/SkGpuDevice.cpp

@@ -616,7 +616,7 @@ inline bool skPaint2GrPaintShader(SkGpuDevice* dev,
 
 ///////////////////////////////////////////////////////////////////////////////
 void SkGpuDevice::clear(SkColor color) {
-    fContext->clear(NULL, color, fRenderTarget);
+    fContext->clear(NULL, SkColor2GrColor(color), fRenderTarget);
     fNeedClear = false;
 }
 

src/image/SkSurface_Gpu.cpp

@@ -42,11 +42,19 @@ SkSurface_Gpu::SkSurface_Gpu(GrContext* ctx, const SkImage::Info& info,
     SkBitmap::Config config = SkImageInfoToBitmapConfig(info, &isOpaque);
 
     fDevice = SkNEW_ARGS(SkGpuDevice, (ctx, config, info.fWidth, info.fHeight, sampleCount));
+
+    if (!isOpaque) {
+        fDevice->clear(0x0);
+    }
 }
 
 SkSurface_Gpu::SkSurface_Gpu(GrContext* ctx, GrRenderTarget* renderTarget)
         : INHERITED(renderTarget->width(), renderTarget->height()) {
     fDevice = SkNEW_ARGS(SkGpuDevice, (ctx, renderTarget));
+
+    if (kRGB_565_GrPixelConfig != renderTarget->config()) {
+        fDevice->clear(0x0);
+    }
 }
 
 SkSurface_Gpu::~SkSurface_Gpu() {