Refugee from Dead Machine 4: MDB Monster

src/effects/SkMorphologyImageFilter.cpp

Index: src/effects/SkMorphologyImageFilter.cpp
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index 5eccb0db233828351ee828617264f4fbba97b807..ca39083cfcffe2aa9dd2c421544a71de33a1d7f1 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -667,18 +667,21 @@ bool apply_morphology(const SkBitmap& input,
     desc.fConfig = kSkia8888_GrPixelConfig;
     SkIRect srcRect = rect;
 
-    GrDrawContext* drawContext = context->drawContext();
-    if (!drawContext) {
-        return false;
-    }
+    GrDrawContext* srcDrawContext = NULL;
 
     if (radius.fWidth > 0) {
-        GrTexture* texture = context->textureProvider()->refScratchTexture(
+        GrTexture* dst = context->textureProvider()->refScratchTexture(
             desc, GrTextureProvider::kApprox_ScratchTexMatch);
-        if (NULL == texture) {
+        if (NULL == dst) {
+            return false;
+        }
+        GrDrawContext* dstDrawContext = context->drawContext(dst->asRenderTarget());
+        if (!dstDrawContext) {
             return false;
         }
-        apply_morphology_pass(drawContext, texture->asRenderTarget(), clip, srcTexture,
+        dstDrawContext->uses(srcTexture);
+
+        apply_morphology_pass(dstDrawContext, dst->asRenderTarget(), clip, srcTexture,
                               srcRect, dstRect, radius.fWidth, morphType,
                               Gr1DKernelEffect::kX_Direction);
         SkIRect clearRect = SkIRect::MakeXYWH(dstRect.fLeft, dstRect.fBottom,
@@ -686,20 +689,34 @@ bool apply_morphology(const SkBitmap& input,
         GrColor clearColor = GrMorphologyEffect::kErode_MorphologyType == morphType ?
                                 SK_ColorWHITE :
                                 SK_ColorTRANSPARENT;
-        drawContext->clear(texture->asRenderTarget(), &clearRect, clearColor, false);
-        srcTexture.reset(texture);
+        dstDrawContext->clear(dst->asRenderTarget(), &clearRect, clearColor, false);
+
+        srcDrawContext = dstDrawContext;
+        srcTexture.reset(dst);
         srcRect = dstRect;
     }
     if (radius.fHeight > 0) {
-        GrTexture* texture = context->textureProvider()->refScratchTexture(desc,
+        GrTexture* dst = context->textureProvider()->refScratchTexture(desc,
             GrTextureProvider::kApprox_ScratchTexMatch);
-        if (NULL == texture) {
+        if (NULL == dst) {
             return false;
         }
-        apply_morphology_pass(drawContext, texture->asRenderTarget(), clip, srcTexture,
+        GrDrawContext* dstDrawContext = context->drawContext(dst->asRenderTarget());
+        if (!dstDrawContext) {
+            return false;
+        }
+        if (srcDrawContext) {
+            dstDrawContext->uses(srcDrawContext);
+        } else {
+            dstDrawContext->uses(srcTexture);
+        }
+
+        apply_morphology_pass(dstDrawContext, dst->asRenderTarget(), clip, srcTexture,
                               srcRect, dstRect, radius.fHeight, morphType,
                               Gr1DKernelEffect::kY_Direction);
-        srcTexture.reset(texture);
+
+        srcDrawContext = dstDrawContext;
+        srcTexture.reset(dst);
     }
     SkImageFilter::WrapTexture(srcTexture, rect.width(), rect.height(), dst);
     return true;
@@ -715,7 +732,8 @@ bool SkMorphologyImageFilter::filterImageGPUGeneric(bool dilate,
                                                     SkIPoint* offset) const {
     SkBitmap input = src;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
-    if (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctx, &input, &srcOffset)) {
+    if (this->getInput(0) && 
+        !this->getInput(0)->getInputResultGPU(proxy, src, ctx, &input, &srcOffset)) {
         return false;
     }
     SkIRect bounds;
@@ -741,9 +759,9 @@ bool SkMorphologyImageFilter::filterImageGPUGeneric(bool dilate,
         return true;
     }
 
-    GrMorphologyEffect::MorphologyType type = dilate ? GrMorphologyEffect::kDilate_MorphologyType : GrMorphologyEffect::kErode_MorphologyType;
-    if (!apply_morphology(input, srcBounds, type,
-                          SkISize::Make(width, height), result)) {
+    GrMorphologyEffect::MorphologyType type = dilate ? GrMorphologyEffect::kDilate_MorphologyType
+                                                     : GrMorphologyEffect::kErode_MorphologyType;
+    if (!apply_morphology(input, srcBounds, type, SkISize::Make(width, height), result)) {
         return false;
     }
     offset->fX = bounds.left();