replace Arithmetic xfermode with imagefilter

chrome pre-cl: https://codereview.chromium.org/2369023002/

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2595

Change-Id: Ia3f3b721854c516f3b7f8c44f71f40a8a2eeb9b4
Reviewed-on: https://skia-review.googlesource.com/2595
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Robert Phillips <robertphillips@google.com>

1 files changed, 9 insertions, 20 deletions

diff --git a/gm/aaxfermodes.cpp b/gm/aaxfermodes.cpp
index 78f7d3e324..678a8379e3 100644
--- a/gm/aaxfermodes.cpp
+++ b/gm/aaxfermodes.cpp
@@ -39,13 +39,11 @@ enum Shape {
     kLast_Shape = kConcave_Shape
 };
 
-namespace skiagm {
-
 /**
  * Verifies AA works properly on all Xfermodes, including arithmetic, with both opaque and unknown
  * src colors.
  */
-class AAXfermodesGM : public GM {
+class AAXfermodesGM : public skiagm::GM {
 public:
     AAXfermodesGM() {}
 
@@ -120,6 +118,9 @@ protected:
             canvas->translate(0, kSubtitleSpacing + kShapeSpacing/2);
 
             for (size_t m = 0; m <= SkXfermode::kLastCoeffMode; m++) {
+                if (firstMode + m > SkXfermode::kLastMode) {
+                    break;
+                }
                 SkXfermode::Mode mode = static_cast<SkXfermode::Mode>(firstMode + m);
                 canvas->save();
 
@@ -210,7 +211,7 @@ protected:
             if (maxSum > 255) {
                 SkPaint dimPaint;
                 dimPaint.setAntiAlias(false);
-                dimPaint.setXfermode(SkXfermode::Make(SkXfermode::kDstIn_Mode));
+                dimPaint.setXfermodeMode(SkXfermode::kDstIn_Mode);
                 if (255 != paint->getAlpha()) {
                     // Dim the src and dst colors.
                     dimPaint.setARGB(255 * 255 / maxSum, 0, 0, 0);
@@ -227,16 +228,10 @@ protected:
     }
 
     void drawShape(SkCanvas* canvas, Shape shape, const SkPaint& paint, SkXfermode::Mode mode) {
+        SkASSERT(mode <= SkXfermode::kLastMode);
         SkPaint shapePaint(paint);
         shapePaint.setAntiAlias(kSquare_Shape != shape);
-
-        sk_sp<SkXfermode> xfermode;
-        if (mode <= SkXfermode::kLastMode) {
-            xfermode = SkXfermode::Make(mode);
-        } else {
-            xfermode = SkArithmeticMode::Make(+1.0f, +0.25f, -0.5f, +0.1f);
-        }
-        shapePaint.setXfermode(std::move(xfermode));
+        shapePaint.setXfermodeMode(mode);
 
         switch (shape) {
             case kSquare_Shape:
@@ -273,12 +268,6 @@ private:
     SkPath    fOval;
     SkPath    fConcave;
 
-    typedef GM INHERITED;
+    typedef skiagm::GM INHERITED;
 };
-
-//////////////////////////////////////////////////////////////////////////////
-
-static GM* MyFactory(void*) { return new AAXfermodesGM; }
-static GMRegistry reg(MyFactory);
-
-}
+DEF_GM( return new AAXfermodesGM; )