Fix filter primitive bounds computations.

src/core/SkCanvas.cpp

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkCanvasPriv.h"
@@ skipping 1052 matching lines @@
 
 bool SkCanvas::clipRectBounds(const SkRect* bounds, SaveFlags flags,
                               SkIRect* intersection, const SkImageFilter* imageFilter) {
     SkIRect clipBounds;
     if (!this->getClipDeviceBounds(&clipBounds)) {
         return false;
     }
 
     const SkMatrix& ctm = fMCRec->fMatrix;  // this->getTotalMatrix()
 
-// This is a temporary hack, until individual filters can do their own
-// bloating, when this will be removed.
-#ifdef SK_SUPPORT_SRC_BOUNDS_BLOAT_FOR_IMAGEFILTERS
-    SkRect storage;
-#endif
     if (imageFilter) {
         imageFilter->filterBounds(clipBounds, ctm, &clipBounds);
-#ifdef SK_SUPPORT_SRC_BOUNDS_BLOAT_FOR_IMAGEFILTERS
-        if (bounds && imageFilter->canComputeFastBounds()) {
-            imageFilter->computeFastBounds(*bounds, &storage);
-            bounds = &storage;
-        } else {
+        if (bounds && !imageFilter->canComputeFastBounds()) {
             bounds = nullptr;
         }
-#endif
     }
     SkIRect ir;
     if (bounds) {
         SkRect r;
 
         ctm.mapRect(&r, *bounds);
         r.roundOut(&ir);
         // early exit if the layer's bounds are clipped out
         if (!ir.intersect(clipBounds)) {
             if (bounds_affects_clip(flags)) {
@@ skipping 265 matching lines @@
         paint = &looper.paint();
         SkImageFilter* filter = paint->getImageFilter();
         SkIPoint pos = { x - iter.getX(), y - iter.getY() };
         if (filter && !dstDev->canHandleImageFilter(filter)) {
             SkImageFilter::DeviceProxy proxy(dstDev);
             SkBitmap dst;
             SkIPoint offset = SkIPoint::Make(0, 0);
             const SkBitmap& src = srcDev->accessBitmap(false);
             SkMatrix matrix = *iter.fMatrix;
             matrix.postTranslate(SkIntToScalar(-pos.x()), SkIntToScalar(-pos.y()));
-            SkIRect clipBounds = SkIRect::MakeWH(srcDev->width(), srcDev->height());
+            SkIRect clipBounds = iter.fClip->getBounds();
+            clipBounds.offset(-pos.x(), -pos.y());
             SkAutoTUnref<SkImageFilter::Cache> cache(dstDev->getImageFilterCache());
             SkImageFilter::Context ctx(matrix, clipBounds, cache.get(),
                                        SkImageFilter::kApprox_SizeConstraint);
             if (filter->filterImage(&proxy, src, ctx, &dst, &offset)) {
                 SkPaint tmpUnfiltered(*paint);
                 tmpUnfiltered.setImageFilter(nullptr);
                 dstDev->drawSprite(iter, dst, pos.x() + offset.x(), pos.y() + offset.y(),
                                    tmpUnfiltered);
             }
         } else if (deviceIsBitmapDevice) {
@@ skipping 1619 matching lines @@
     }
 
     if (matrix) {
         canvas->concat(*matrix);
     }
 }
 
 SkAutoCanvasMatrixPaint::~SkAutoCanvasMatrixPaint() {
     fCanvas->restoreToCount(fSaveCount);
 }