Fix issue with drawColor(color, Mode.Clear)

Change-Id: I486b24a5b609c6f8adb0276037ddb24af2b888b2

2 files changed, 15 insertions, 0 deletions

diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index 8e9e8be..6243b01 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -990,12 +990,26 @@ void OpenGLRenderer::setupDrawColorFilter() {
     }
 }
 
+void OpenGLRenderer::accountForClear(SkXfermode::Mode mode) {
+    if (mColorSet && mode == SkXfermode::kClear_Mode) {
+        mColorA = 1.0f;
+        mColorR = mColorG = mColorB = 0.0f;
+        mSetShaderColor = mDescription.setAlpha8Color(mColorR, mColorG, mColorB, mColorA);
+    }
+}
+
 void OpenGLRenderer::setupDrawBlending(SkXfermode::Mode mode, bool swapSrcDst) {
+    // When the blending mode is kClear_Mode, we need to use a modulate color
+    // argb=1,0,0,0
+    accountForClear(mode);
     chooseBlending((mColorSet && mColorA < 1.0f) || (mShader && mShader->blend()), mode,
             mDescription, swapSrcDst);
 }
 
 void OpenGLRenderer::setupDrawBlending(bool blend, SkXfermode::Mode mode, bool swapSrcDst) {
+    // When the blending mode is kClear_Mode, we need to use a modulate color
+    // argb=1,0,0,0
+    accountForClear(mode);
     chooseBlending(blend || (mColorSet && mColorA < 1.0f) || (mShader && mShader->blend()), mode,
             mDescription, swapSrcDst);
 }
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index 70abe88..e2dbba0 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -478,6 +478,7 @@ private:
     void setupDrawAALine(GLvoid* vertices, GLvoid* distanceCoords, GLvoid* lengthCoords,
             float strokeWidth);
     void finishDrawTexture();
+    void accountForClear(SkXfermode::Mode mode);
 
     void drawRegionRects(const Region& region);