Fix SkImageSource::filterBounds()

Previously SkImageSource::filterBounds() uses the default
SkImageFilter::onFilterNodeBounds() which returns the input rect.

Now override onFilterNodeBounds() in SkImageSource to return src
or dst rect (with transform applied).

Change-Id: I6681e1ba97affb09ef1ca5bc03b3d0f66c10f149
Reviewed-on: https://skia-review.googlesource.com/46741
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/effects/SkImageSource.cpp b/src/effects/SkImageSource.cpp
index cd2fb51e94..8ab02ce0cb 100644
--- a/src/effects/SkImageSource.cpp
+++ b/src/effects/SkImageSource.cpp
@@ -146,6 +146,13 @@ SkRect SkImageSource::computeFastBounds(const SkRect& src) const {
     return fDstRect;
 }
 
+SkIRect SkImageSource::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
+                                          MapDirection direction) const {
+    SkRect bounds = kForward_MapDirection == direction ? fDstRect : fSrcRect;
+    ctm.mapRect(&bounds);
+    return bounds.roundOut();
+}
+
 #ifndef SK_IGNORE_TO_STRING
 void SkImageSource::toString(SkString* str) const {
     str->appendf("SkImageSource: (");