Use opaque black not transparent black as imagefilter GM background.

For some reason, GM's are now being composited against white
in some modes, where the alpha used to be ignored (or composited
against black, I'm not sure which). At any rate, it doesn't
make much sense to have alpha in the result anyway, so let's clear to
opaque black instead of transparent black and avoid the problem.

This is a trial balloon for bitmapsource and pictureimagefilter.
If all goes well, I'll make this change more widely.

R=scroggo
BUG=skia:3319

Review URL: https://codereview.chromium.org/1074513002

2 files changed, 3 insertions, 3 deletions

diff --git a/gm/bitmapsource.cpp b/gm/bitmapsource.cpp
index d59524f011..a0a3eca663 100644
--- a/gm/bitmapsource.cpp
+++ b/gm/bitmapsource.cpp
@@ -50,7 +50,7 @@ protected:
     }
 
     void onDraw(SkCanvas* canvas) override {
-        canvas->clear(0x00000000);
+        canvas->clear(SK_ColorBLACK);
         {
             SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
             SkRect dstRect = SkRect::MakeXYWH(0, 10, 60, 60);
diff --git a/gm/pictureimagefilter.cpp b/gm/pictureimagefilter.cpp
index a4cb6b3f5f..fd8ae62fa2 100644
--- a/gm/pictureimagefilter.cpp
+++ b/gm/pictureimagefilter.cpp
@@ -25,7 +25,7 @@ protected:
     void makePicture() {
         SkPictureRecorder recorder;
         SkCanvas* canvas = recorder.beginRecording(100, 100, NULL, 0);
-        canvas->clear(0x00000000);
+        canvas->clear(SK_ColorBLACK);
         SkPaint paint;
         paint.setAntiAlias(true);
         sk_tool_utils::set_portable_typeface(&paint);
@@ -52,7 +52,7 @@ protected:
     }
 
     void onDraw(SkCanvas* canvas) override {
-        canvas->clear(0x00000000);
+        canvas->clear(SK_ColorBLACK);
         {
             SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
             SkRect emptyRect = SkRect::MakeXYWH(20, 20, 0, 0);