Fix bounds computation of all 0-input filters.

The SkRectShaderImageFilter had the same bug as previously fixed for
SkBitmapSource and SkPictureImageFilter. Rather than copy-and-paste
the implementation, this change makes all filters with 0 inputs return
their source bounds, instead of returning false.

BUG=427251

Review URL: https://codereview.chromium.org/681643003

7 files changed, 12 insertions, 17 deletions

diff --git a/expectations/gm/ignored-tests.txt b/expectations/gm/ignored-tests.txt
index 1499accc4a..63d6a8490d 100644
--- a/expectations/gm/ignored-tests.txt
+++ b/expectations/gm/ignored-tests.txt
@@ -36,6 +36,10 @@
 # robertphillips - skia:2995
 blurrects
 
+# senorblanco https://codereview.chromium.org/681643003/
+# minor pixel diffs from bounds change
+testimagefilters
+
 # sugoi https://codereview.chromium.org/646213004/
 # New shadow only option in SkDropShadowImageFilter
 dropshadowimagefilter
diff --git a/include/effects/SkBitmapSource.h b/include/effects/SkBitmapSource.h
index 9004a462fc..27c7ae204f 100644
--- a/include/effects/SkBitmapSource.h
+++ b/include/effects/SkBitmapSource.h
@@ -34,7 +34,6 @@ protected:
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
-    virtual bool onFilterBounds(const SkIRect& src, const SkMatrix& ctm, SkIRect* dst) const SK_OVERRIDE;
 
 private:
     SkBitmap fBitmap;
diff --git a/include/effects/SkPictureImageFilter.h b/include/effects/SkPictureImageFilter.h
index fbd04f097a..ed5c63c18a 100644
--- a/include/effects/SkPictureImageFilter.h
+++ b/include/effects/SkPictureImageFilter.h
@@ -46,8 +46,6 @@ protected:
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
-    virtual bool onFilterBounds(const SkIRect& src, const SkMatrix&,
-                                SkIRect* dst) const SK_OVERRIDE;
 
 private:
     const SkPicture* fPicture;
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 666b719831..3a84e41be8 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -342,7 +342,8 @@ bool SkImageFilter::applyCropRect(const Context& ctx, Proxy* proxy, const SkBitm
 bool SkImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
                                    SkIRect* dst) const {
     if (fInputCount < 1) {
-        return false;
+        *dst = src;
+        return true;
     }
 
     SkIRect bounds;
diff --git a/src/effects/SkBitmapSource.cpp b/src/effects/SkBitmapSource.cpp
index aee4a361f2..0d9315b2ab 100644
--- a/src/effects/SkBitmapSource.cpp
+++ b/src/effects/SkBitmapSource.cpp
@@ -97,9 +97,3 @@ bool SkBitmapSource::onFilterImage(Proxy* proxy, const SkBitmap&, const Context&
 void SkBitmapSource::computeFastBounds(const SkRect&, SkRect* dst) const {
     *dst = fDstRect;
 }
-
-bool SkBitmapSource::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
-                                    SkIRect* dst) const {
-    *dst = src;
-    return true;
-}
diff --git a/src/effects/SkPictureImageFilter.cpp b/src/effects/SkPictureImageFilter.cpp
index bed19ef89d..30fbac184a 100644
--- a/src/effects/SkPictureImageFilter.cpp
+++ b/src/effects/SkPictureImageFilter.cpp
@@ -110,10 +110,3 @@ bool SkPictureImageFilter::onFilterImage(Proxy* proxy, const SkBitmap&, const Co
     offset->fY = bounds.fTop;
     return true;
 }
-
-bool SkPictureImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
-                                          SkIRect* dst) const {
-    *dst = src;
-    return true;
-}
-
diff --git a/tests/ImageFilterTest.cpp b/tests/ImageFilterTest.cpp
index 778230b5d6..e032a810ca 100644
--- a/tests/ImageFilterTest.cpp
+++ b/tests/ImageFilterTest.cpp
@@ -23,11 +23,13 @@
 #include "SkMergeImageFilter.h"
 #include "SkMorphologyImageFilter.h"
 #include "SkOffsetImageFilter.h"
+#include "SkPerlinNoiseShader.h"
 #include "SkPicture.h"
 #include "SkPictureImageFilter.h"
 #include "SkPictureRecorder.h"
 #include "SkReadBuffer.h"
 #include "SkRect.h"
+#include "SkRectShaderImageFilter.h"
 #include "SkTileImageFilter.h"
 #include "SkXfermodeImageFilter.h"
 #include "Test.h"
@@ -399,6 +401,9 @@ DEF_TEST(ImageFilterDrawTiled, reporter) {
     recordingCanvas->drawRect(SkRect::Make(SkIRect::MakeXYWH(10, 10, 30, 20)), greenPaint);
     SkAutoTUnref<SkPicture> picture(recorder.endRecording());
     SkAutoTUnref<SkImageFilter> pictureFilter(SkPictureImageFilter::Create(picture.get()));
+    SkAutoTUnref<SkShader> shader(SkPerlinNoiseShader::CreateTurbulence(SK_Scalar1, SK_Scalar1, 1, 0));
+
+    SkAutoTUnref<SkImageFilter> rectShaderFilter(SkRectShaderImageFilter::Create(shader.get()));
 
     struct {
         const char*    fName;
@@ -430,6 +435,7 @@ DEF_TEST(ImageFilterDrawTiled, reporter) {
         { "matrix", SkMatrixImageFilter::Create(matrix, SkPaint::kLow_FilterLevel) },
         { "blur and offset", SkOffsetImageFilter::Create(five, five, blur.get()) },
         { "picture and blur", SkBlurImageFilter::Create(five, five, pictureFilter.get()) },
+        { "rect shader and blur", SkBlurImageFilter::Create(five, five, rectShaderFilter.get()) },
     };
 
     SkBitmap untiledResult, tiledResult;