Reland "Fix SkImageSource::filterBounds()"

This relands commit cb4d58766668b003fea67798027fc25d84acd059
which was reverted by commit b6d2be1330f16fe05f1eed5abda927c0fbb50055
because the original CL broke some blink layout tests.

This reland let SkImageSource::filterBounds() return the dst rect with
ctm applied regardless of direction.

Original description:

> 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: I915b7889ff59829ddbc4479cd66d75a0bb581e54
Reviewed-on: https://skia-review.googlesource.com/47501
Commit-Queue: Stephen White <senorblanco@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/effects/SkImageSource.cpp b/src/effects/SkImageSource.cpp
index cd2fb51e94..7b8ce0be95 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 dstRect = fDstRect;
+    ctm.mapRect(&dstRect);
+    return dstRect.roundOut();
+}
+
 #ifndef SK_IGNORE_TO_STRING
 void SkImageSource::toString(SkString* str) const {
     str->appendf("SkImageSource: (");