Revert "replace SkXfermode obj with SkBlendMode enum in paints"

This reverts commit I4fb489ba6b3f77b458f7e4a99f79c7ad10859135.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> replace SkXfermode obj with SkBlendMode enum in paints
> 
> BUG=skia:5814
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2714
> 
> Change-Id: I4fb489ba6b3f77b458f7e4a99f79c7ad10859135
> Reviewed-on: https://skia-review.googlesource.com/2714
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Mike Reed <reed@google.com>
> 

TBR=bsalomon@google.com,fmalita@chromium.org,fmalita@google.com,reed@google.com,reviews@skia.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Change-Id: I3e43f79ef5c1709929663fe63cc1f67cd78270b7
Reviewed-on: https://skia-review.googlesource.com/2871
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

3 files changed, 107 insertions, 82 deletions

diff --git a/bench/RectBench.cpp b/bench/RectBench.cpp
index 48764cabdf..46a515de29 100644
--- a/bench/RectBench.cpp
+++ b/bench/RectBench.cpp
@@ -85,7 +85,7 @@ private:
 class SrcModeRectBench : public RectBench {
 public:
     SrcModeRectBench() : INHERITED(1, 0) {
-        fMode = SkBlendMode::kSrc;
+        fMode = SkXfermode::Make(SkXfermode::kSrc_Mode);
     }
 
 protected:
@@ -93,7 +93,7 @@ protected:
         this->INHERITED::setupPaint(paint);
         // srcmode is most interesting when we're not opaque
         paint->setAlpha(0x80);
-        paint->setBlendMode(fMode);
+        paint->setXfermode(fMode);
     }
 
     const char* onGetName() override {
@@ -103,8 +103,8 @@ protected:
     }
 
 private:
-    SkString    fName;
-    SkBlendMode fMode;
+    SkString fName;
+    sk_sp<SkXfermode> fMode;
 
     typedef RectBench INHERITED;
 };
diff --git a/bench/RotatedRectBench.cpp b/bench/RotatedRectBench.cpp
index f81bfb1d10..23e044330c 100644
--- a/bench/RotatedRectBench.cpp
+++ b/bench/RotatedRectBench.cpp
@@ -67,7 +67,7 @@ static SkString to_lower(const char* str) {
 
 class RotRectBench: public Benchmark {
 public:
-    RotRectBench(bool aa, ColorType ct, SkBlendMode mode)
+    RotRectBench(bool aa, ColorType ct, SkXfermode::Mode mode)
         : fAA(aa)
         , fColorType(ct)
         , fMode(mode) {
@@ -80,7 +80,7 @@ protected:
     void onDraw(int loops, SkCanvas* canvas) override {
         SkPaint paint;
         paint.setAntiAlias(fAA);
-        paint.setBlendMode(fMode);
+        paint.setXfermodeMode(fMode);
         SkColor color = start_color(fColorType);
 
         int w = this->getSize().x();
@@ -147,48 +147,48 @@ private:
         fName.appendf("_%s", to_lower(SkXfermode::ModeName(fMode)).c_str());
     }
 
-    bool        fAA;
-    ColorType   fColorType;
-    SkBlendMode fMode;
-    SkString    fName;
+    bool             fAA;
+    ColorType        fColorType;
+    SkXfermode::Mode fMode;
+    SkString         fName;
 
     typedef Benchmark INHERITED;
 };
 
 // Choose kSrcOver because it always allows coverage and alpha to be conflated. kSrc only allows
 // conflation when opaque, and kDarken because it isn't possilbe with standard GL blending.
-DEF_BENCH(return new RotRectBench(true,  kConstantOpaque_ColorType,                  SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(true,  kConstantTransparent_ColorType,             SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(true,  kChangingOpaque_ColorType,                  SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(true,  kChangingTransparent_ColorType,             SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(true,  kAlternatingOpaqueAndTransparent_ColorType, SkBlendMode::kSrcOver);)
-
-DEF_BENCH(return new RotRectBench(false, kConstantOpaque_ColorType,                  SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(false, kConstantTransparent_ColorType,             SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(false, kChangingOpaque_ColorType,                  SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(false, kChangingTransparent_ColorType,             SkBlendMode::kSrcOver);)
-DEF_BENCH(return new RotRectBench(false, kAlternatingOpaqueAndTransparent_ColorType, SkBlendMode::kSrcOver);)
-
-DEF_BENCH(return new RotRectBench(true,  kConstantOpaque_ColorType,                  SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(true,  kConstantTransparent_ColorType,             SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(true,  kChangingOpaque_ColorType,                  SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(true,  kChangingTransparent_ColorType,             SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(true,  kAlternatingOpaqueAndTransparent_ColorType, SkBlendMode::kSrc);)
-
-DEF_BENCH(return new RotRectBench(false, kConstantOpaque_ColorType,                  SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(false, kConstantTransparent_ColorType,             SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(false, kChangingOpaque_ColorType,                  SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(false, kChangingTransparent_ColorType,             SkBlendMode::kSrc);)
-DEF_BENCH(return new RotRectBench(false, kAlternatingOpaqueAndTransparent_ColorType, SkBlendMode::kSrc);)
-
-DEF_BENCH(return new RotRectBench(true,  kConstantOpaque_ColorType,                  SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(true,  kConstantTransparent_ColorType,             SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(true,  kChangingOpaque_ColorType,                  SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(true,  kChangingTransparent_ColorType,             SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(true,  kAlternatingOpaqueAndTransparent_ColorType, SkBlendMode::kDarken);)
-
-DEF_BENCH(return new RotRectBench(false, kConstantOpaque_ColorType,                  SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(false, kConstantTransparent_ColorType,             SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(false, kChangingOpaque_ColorType,                  SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(false, kChangingTransparent_ColorType,             SkBlendMode::kDarken);)
-DEF_BENCH(return new RotRectBench(false, kAlternatingOpaqueAndTransparent_ColorType, SkBlendMode::kDarken);)
+DEF_BENCH(return new RotRectBench(true,  kConstantOpaque_ColorType,                  SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kConstantTransparent_ColorType,             SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kChangingOpaque_ColorType,                  SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kChangingTransparent_ColorType,             SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kAlternatingOpaqueAndTransparent_ColorType, SkXfermode::kSrcOver_Mode);)
+
+DEF_BENCH(return new RotRectBench(false, kConstantOpaque_ColorType,                  SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(false, kConstantTransparent_ColorType,             SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(false, kChangingOpaque_ColorType,                  SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(false, kChangingTransparent_ColorType,             SkXfermode::kSrcOver_Mode);)
+DEF_BENCH(return new RotRectBench(false, kAlternatingOpaqueAndTransparent_ColorType, SkXfermode::kSrcOver_Mode);)
+
+DEF_BENCH(return new RotRectBench(true,  kConstantOpaque_ColorType,                  SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kConstantTransparent_ColorType,             SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kChangingOpaque_ColorType,                  SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kChangingTransparent_ColorType,             SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kAlternatingOpaqueAndTransparent_ColorType, SkXfermode::kSrc_Mode);)
+
+DEF_BENCH(return new RotRectBench(false, kConstantOpaque_ColorType,                  SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(false, kConstantTransparent_ColorType,             SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(false, kChangingOpaque_ColorType,                  SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(false, kChangingTransparent_ColorType,             SkXfermode::kSrc_Mode);)
+DEF_BENCH(return new RotRectBench(false, kAlternatingOpaqueAndTransparent_ColorType, SkXfermode::kSrc_Mode);)
+
+DEF_BENCH(return new RotRectBench(true,  kConstantOpaque_ColorType,                  SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kConstantTransparent_ColorType,             SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kChangingOpaque_ColorType,                  SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kChangingTransparent_ColorType,             SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(true,  kAlternatingOpaqueAndTransparent_ColorType, SkXfermode::kDarken_Mode);)
+
+DEF_BENCH(return new RotRectBench(false, kConstantOpaque_ColorType,                  SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(false, kConstantTransparent_ColorType,             SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(false, kChangingOpaque_ColorType,                  SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(false, kChangingTransparent_ColorType,             SkXfermode::kDarken_Mode);)
+DEF_BENCH(return new RotRectBench(false, kAlternatingOpaqueAndTransparent_ColorType, SkXfermode::kDarken_Mode);)
diff --git a/bench/XfermodeBench.cpp b/bench/XfermodeBench.cpp
index 9e148d4317..60879d603e 100644
--- a/bench/XfermodeBench.cpp
+++ b/bench/XfermodeBench.cpp
@@ -15,8 +15,10 @@
 // Benchmark that draws non-AA rects or AA text with an SkXfermode::Mode.
 class XfermodeBench : public Benchmark {
 public:
-    XfermodeBench(SkBlendMode mode, bool aa) : fBlendMode(mode) {
+    XfermodeBench(SkXfermode::Mode mode, bool aa) {
+        fXfermode = SkXfermode::Make(mode);
         fAA = aa;
+        SkASSERT(fXfermode.get() || SkXfermode::kSrcOver_Mode == mode);
         fName.printf("Xfermode_%s%s", SkXfermode::ModeName(mode), aa ? "_aa" : "");
     }
 
@@ -30,7 +32,7 @@ protected:
         SkRandom random;
         for (int i = 0; i < loops; ++i) {
             SkPaint paint;
-            paint.setBlendMode(fBlendMode);
+            paint.setXfermode(fXfermode);
             paint.setColor(random.nextU());
             if (fAA) {
                 // Draw text to exercise AA code paths.
@@ -59,48 +61,71 @@ protected:
     }
 
 private:
-    SkBlendMode fBlendMode;
-    SkString    fName;
-    bool        fAA;
+    sk_sp<SkXfermode>   fXfermode;
+    SkString            fName;
+    bool                fAA;
 
     typedef Benchmark INHERITED;
 };
 
+class XferCreateBench : public Benchmark {
+public:
+    bool isSuitableFor(Backend backend) override {
+        return backend == kNonRendering_Backend;
+    }
+
+protected:
+    const char* onGetName() override { return "xfermode_create"; }
+
+    void onDraw(int loops, SkCanvas* canvas) override {
+        for (int outer = 0; outer < loops * 10; ++outer) {
+            for (int i = 0; i <= SkXfermode::kLastMode; ++i) {
+                (void)SkXfermode::Make(SkXfermode::Mode(i));
+            }
+        }
+    }
+
+private:
+    typedef Benchmark INHERITED;
+};
+
 //////////////////////////////////////////////////////////////////////////////
 
 #define BENCH(...)                                             \
     DEF_BENCH( return new XfermodeBench(__VA_ARGS__, true); )  \
     DEF_BENCH( return new XfermodeBench(__VA_ARGS__, false); )
 
-BENCH(SkBlendMode::kClear)
-BENCH(SkBlendMode::kSrc)
-BENCH(SkBlendMode::kDst)
-BENCH(SkBlendMode::kSrcOver)
-BENCH(SkBlendMode::kDstOver)
-BENCH(SkBlendMode::kSrcIn)
-BENCH(SkBlendMode::kDstIn)
-BENCH(SkBlendMode::kSrcOut)
-BENCH(SkBlendMode::kDstOut)
-BENCH(SkBlendMode::kSrcATop)
-BENCH(SkBlendMode::kDstATop)
-BENCH(SkBlendMode::kXor)
-
-BENCH(SkBlendMode::kPlus)
-BENCH(SkBlendMode::kModulate)
-BENCH(SkBlendMode::kScreen)
-
-BENCH(SkBlendMode::kOverlay)
-BENCH(SkBlendMode::kDarken)
-BENCH(SkBlendMode::kLighten)
-BENCH(SkBlendMode::kColorDodge)
-BENCH(SkBlendMode::kColorBurn)
-BENCH(SkBlendMode::kHardLight)
-BENCH(SkBlendMode::kSoftLight)
-BENCH(SkBlendMode::kDifference)
-BENCH(SkBlendMode::kExclusion)
-BENCH(SkBlendMode::kMultiply)
-
-BENCH(SkBlendMode::kHue)
-BENCH(SkBlendMode::kSaturation)
-BENCH(SkBlendMode::kColor)
-BENCH(SkBlendMode::kLuminosity)
+BENCH(SkXfermode::kClear_Mode)
+BENCH(SkXfermode::kSrc_Mode)
+BENCH(SkXfermode::kDst_Mode)
+BENCH(SkXfermode::kSrcOver_Mode)
+BENCH(SkXfermode::kDstOver_Mode)
+BENCH(SkXfermode::kSrcIn_Mode)
+BENCH(SkXfermode::kDstIn_Mode)
+BENCH(SkXfermode::kSrcOut_Mode)
+BENCH(SkXfermode::kDstOut_Mode)
+BENCH(SkXfermode::kSrcATop_Mode)
+BENCH(SkXfermode::kDstATop_Mode)
+BENCH(SkXfermode::kXor_Mode)
+
+BENCH(SkXfermode::kPlus_Mode)
+BENCH(SkXfermode::kModulate_Mode)
+BENCH(SkXfermode::kScreen_Mode)
+
+BENCH(SkXfermode::kOverlay_Mode)
+BENCH(SkXfermode::kDarken_Mode)
+BENCH(SkXfermode::kLighten_Mode)
+BENCH(SkXfermode::kColorDodge_Mode)
+BENCH(SkXfermode::kColorBurn_Mode)
+BENCH(SkXfermode::kHardLight_Mode)
+BENCH(SkXfermode::kSoftLight_Mode)
+BENCH(SkXfermode::kDifference_Mode)
+BENCH(SkXfermode::kExclusion_Mode)
+BENCH(SkXfermode::kMultiply_Mode)
+
+BENCH(SkXfermode::kHue_Mode)
+BENCH(SkXfermode::kSaturation_Mode)
+BENCH(SkXfermode::kColor_Mode)
+BENCH(SkXfermode::kLuminosity_Mode)
+
+DEF_BENCH(return new XferCreateBench;)