Revert[8] "replace SkXfermode obj with SkBlendMode enum in paints"

This reverts commit c245574ba3d0e2ade6c94b2812de3baa383bf4c4.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2396953002

TBR=

Review-Url: https://codereview.chromium.org/2396953002

14 files changed, 95 insertions, 43 deletions

diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index 515e05b323..bbae2e1552 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -107,7 +107,7 @@ sk_sp<GrTexture> SkAlphaThresholdFilterImpl::createMaskTexture(GrContext* contex
     }
 
     GrPaint grPaint;
-    grPaint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    grPaint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     SkRegion::Iterator iter(fRegion);
     drawContext->clear(nullptr, 0x0, true);
 
diff --git a/src/effects/SkArithmeticMode.cpp b/src/effects/SkArithmeticMode.cpp
index 81f29bb9d8..62595cf1ee 100644
--- a/src/effects/SkArithmeticMode.cpp
+++ b/src/effects/SkArithmeticMode.cpp
@@ -39,6 +39,14 @@ public:
     sk_sp<GrXPFactory> asXPFactory() const override;
 #endif
 
+    bool isArithmetic(SkArithmeticParams* params) const override {
+        if (params) {
+            memcpy(params->fK, fK, 4 * sizeof(float));
+            params->fEnforcePMColor = fEnforcePMColor;
+        }
+        return true;
+    }
+
 private:
     void flatten(SkWriteBuffer& buffer) const override {
         buffer.writeScalar(fK[0]);
diff --git a/src/effects/SkArithmeticModePriv.h b/src/effects/SkArithmeticModePriv.h
index 04bd90eebe..e619274d25 100644
--- a/src/effects/SkArithmeticModePriv.h
+++ b/src/effects/SkArithmeticModePriv.h
@@ -10,6 +10,11 @@
 
 #include "SkArithmeticMode.h"
 
+struct SkArithmeticParams {
+    float fK[4];
+    bool fEnforcePMColor;
+};
+
 #ifndef SK_SUPPORT_LEGACY_ARITHMETICMODE
 
 class SK_API SkArithmeticMode {
diff --git a/src/effects/SkColorFilterImageFilter.cpp b/src/effects/SkColorFilterImageFilter.cpp
index d6b23d5038..507a80580f 100644
--- a/src/effects/SkColorFilterImageFilter.cpp
+++ b/src/effects/SkColorFilterImageFilter.cpp
@@ -89,7 +89,7 @@ sk_sp<SkSpecialImage> SkColorFilterImageFilter::onFilterImage(SkSpecialImage* so
 
     SkPaint paint;
 
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    paint.setBlendMode(SkBlendMode::kSrc);
     paint.setColorFilter(fColorFilter);
 
     // TODO: it may not be necessary to clear or drawPaint inside the input bounds
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 283372f9a9..88f5026663 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -343,7 +343,7 @@ sk_sp<SkSpecialImage> SkDisplacementMapEffect::onFilterImage(SkSpecialImage* sou
                                           offsetMatrix,
                                           colorTexture.get(),
                                           SkISize::Make(color->width(), color->height())));
-        paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+        paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
         SkMatrix matrix;
         matrix.setTranslate(-SkIntToScalar(colorBounds.x()), -SkIntToScalar(colorBounds.y()));
 
diff --git a/src/effects/SkDropShadowImageFilter.cpp b/src/effects/SkDropShadowImageFilter.cpp
index b4b8cac4f0..cc43db7f08 100644
--- a/src/effects/SkDropShadowImageFilter.cpp
+++ b/src/effects/SkDropShadowImageFilter.cpp
@@ -95,7 +95,6 @@ sk_sp<SkSpecialImage> SkDropShadowImageFilter::onFilterImage(SkSpecialImage* sou
     SkPaint paint;
     paint.setImageFilter(SkBlurImageFilter::Make(sigma.fX, sigma.fY, nullptr));
     paint.setColorFilter(SkColorFilter::MakeModeFilter(fColor, SkXfermode::kSrcIn_Mode));
-    paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
 
     SkVector offsetVec = SkVector::Make(fDx, fDy);
     ctx.ctm().mapVectors(&offsetVec, 1);
diff --git a/src/effects/SkImageSource.cpp b/src/effects/SkImageSource.cpp
index f434de4aa0..f96a4a1676 100644
--- a/src/effects/SkImageSource.cpp
+++ b/src/effects/SkImageSource.cpp
@@ -108,7 +108,7 @@ sk_sp<SkSpecialImage> SkImageSource::onFilterImage(SkSpecialImage* source, const
 
     // Subtract off the integer component of the translation (will be applied in offset, below).
     dstRect.offset(-SkIntToScalar(dstIRect.fLeft), -SkIntToScalar(dstIRect.fTop));
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    paint.setBlendMode(SkBlendMode::kSrc);
     // FIXME: this probably shouldn't be necessary, but drawImageRect asserts
     // None filtering when it's translate-only
     paint.setFilterQuality(
diff --git a/src/effects/SkLayerDrawLooper.cpp b/src/effects/SkLayerDrawLooper.cpp
index d8f774437e..784228fa8b 100644
--- a/src/effects/SkLayerDrawLooper.cpp
+++ b/src/effects/SkLayerDrawLooper.cpp
@@ -104,7 +104,7 @@ void SkLayerDrawLooper::LayerDrawLooperContext::ApplyInfo(
         dst->setColorFilter(sk_ref_sp(src.getColorFilter()));
     }
     if (bits & kXfermode_Bit) {
-        dst->setXfermode(sk_ref_sp(src.getXfermode()));
+        dst->setBlendMode(src.getBlendMode());
     }
 
     // we don't override these
diff --git a/src/effects/SkLightingImageFilter.cpp b/src/effects/SkLightingImageFilter.cpp
index 56275743d7..057ef24e95 100644
--- a/src/effects/SkLightingImageFilter.cpp
+++ b/src/effects/SkLightingImageFilter.cpp
@@ -396,7 +396,7 @@ void SkLightingImageFilterInternal::drawRect(GrDrawContext* drawContext,
     sk_sp<GrFragmentProcessor> fp(this->makeFragmentProcessor(src, matrix, srcBounds,
                                                               boundaryMode));
     paint.addColorFragmentProcessor(std::move(fp));
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     drawContext->fillRectToRect(clip, paint, SkMatrix::I(), dstRect, srcRect);
 }
 
diff --git a/src/effects/SkMergeImageFilter.cpp b/src/effects/SkMergeImageFilter.cpp
index cc7e336a3d..9830669f04 100755
--- a/src/effects/SkMergeImageFilter.cpp
+++ b/src/effects/SkMergeImageFilter.cpp
@@ -131,7 +131,7 @@ sk_sp<SkSpecialImage> SkMergeImageFilter::onFilterImage(SkSpecialImage* source,
 
         SkPaint paint;
         if (fModes) {
-            paint.setXfermodeMode((SkXfermode::Mode)fModes[i]);
+            paint.setBlendMode((SkBlendMode)fModes[i]);
         }
 
         inputs[i]->draw(canvas,
diff --git a/src/effects/SkMorphologyImageFilter.cpp b/src/effects/SkMorphologyImageFilter.cpp
index 82e47c5081..2bd792860b 100644
--- a/src/effects/SkMorphologyImageFilter.cpp
+++ b/src/effects/SkMorphologyImageFilter.cpp
@@ -401,7 +401,7 @@ static void apply_morphology_rect(GrDrawContext* drawContext,
                                                              radius,
                                                              morphType,
                                                              bounds));
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     drawContext->fillRectToRect(clip, paint, SkMatrix::I(), SkRect::Make(dstRect),
                                      SkRect::Make(srcRect));
 }
@@ -418,7 +418,7 @@ static void apply_morphology_rect_no_bounds(GrDrawContext* drawContext,
     paint.setGammaCorrect(drawContext->isGammaCorrect());
     paint.addColorFragmentProcessor(GrMorphologyEffect::Make(texture, direction, radius,
                                                              morphType));
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
     drawContext->fillRectToRect(clip, paint, SkMatrix::I(), SkRect::Make(dstRect),
                                 SkRect::Make(srcRect));
 }
diff --git a/src/effects/SkOffsetImageFilter.cpp b/src/effects/SkOffsetImageFilter.cpp
index 1c99154f16..2e8b0d916d 100644
--- a/src/effects/SkOffsetImageFilter.cpp
+++ b/src/effects/SkOffsetImageFilter.cpp
@@ -61,7 +61,7 @@ sk_sp<SkSpecialImage> SkOffsetImageFilter::onFilterImage(SkSpecialImage* source,
         canvas->clear(0x0);
 
         SkPaint paint;
-        paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+        paint.setBlendMode(SkBlendMode::kSrc);
         canvas->translate(SkIntToScalar(srcOffset.fX - bounds.fLeft),
                           SkIntToScalar(srcOffset.fY - bounds.fTop));
 
diff --git a/src/effects/SkTileImageFilter.cpp b/src/effects/SkTileImageFilter.cpp
index 46c4d9af67..a140db216b 100644
--- a/src/effects/SkTileImageFilter.cpp
+++ b/src/effects/SkTileImageFilter.cpp
@@ -87,7 +87,7 @@ sk_sp<SkSpecialImage> SkTileImageFilter::onFilterImage(SkSpecialImage* source,
         SkASSERT(canvas);
 
         SkPaint paint;
-        paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+        paint.setBlendMode(SkBlendMode::kSrc);
 
         input->draw(canvas, 
                     SkIntToScalar(inputOffset.x()), SkIntToScalar(inputOffset.y()),
@@ -107,7 +107,7 @@ sk_sp<SkSpecialImage> SkTileImageFilter::onFilterImage(SkSpecialImage* source,
     SkASSERT(canvas);
 
     SkPaint paint;
-    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    paint.setBlendMode(SkBlendMode::kSrc);
     paint.setShader(subset->makeShader(SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode));
     canvas->translate(-dstRect.fLeft, -dstRect.fTop);
     canvas->drawRect(dstRect, paint);
diff --git a/src/effects/SkXfermodeImageFilter.cpp b/src/effects/SkXfermodeImageFilter.cpp
index 952ce977aa..b0735168b5 100644
--- a/src/effects/SkXfermodeImageFilter.cpp
+++ b/src/effects/SkXfermodeImageFilter.cpp
@@ -6,6 +6,7 @@
  */
 
 #include "SkXfermodeImageFilter.h"
+#include "SkArithmeticModePriv.h"
 
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
@@ -27,7 +28,7 @@
 
 class SkXfermodeImageFilter_Base : public SkImageFilter {
 public:
-    SkXfermodeImageFilter_Base(sk_sp<SkXfermode> mode, sk_sp<SkImageFilter> inputs[2],
+    SkXfermodeImageFilter_Base(SkBlendMode mode, sk_sp<SkImageFilter> inputs[2],
                                const CropRect* cropRect);
 
     SK_TO_STRING_OVERRIDE()
@@ -55,7 +56,7 @@ protected:
 #endif
 
 private:
-    sk_sp<SkXfermode> fMode;
+    SkBlendMode fMode;
 
     friend class SkXfermodeImageFilter;
 
@@ -64,7 +65,7 @@ private:
 
 ///////////////////////////////////////////////////////////////////////////////
 
-sk_sp<SkImageFilter> SkXfermodeImageFilter::Make(sk_sp<SkXfermode> mode,
+sk_sp<SkImageFilter> SkXfermodeImageFilter::Make(SkBlendMode mode,
                                                  sk_sp<SkImageFilter> background,
                                                  sk_sp<SkImageFilter> foreground,
                                                  const SkImageFilter::CropRect* cropRect) {
@@ -72,23 +73,59 @@ sk_sp<SkImageFilter> SkXfermodeImageFilter::Make(sk_sp<SkXfermode> mode,
     return sk_sp<SkImageFilter>(new SkXfermodeImageFilter_Base(mode, inputs, cropRect));
 }
 
-SkXfermodeImageFilter_Base::SkXfermodeImageFilter_Base(sk_sp<SkXfermode> mode,
-                                             sk_sp<SkImageFilter> inputs[2],
-                                             const CropRect* cropRect)
+#ifdef SK_SUPPORT_LEGACY_XFERMODE_OBJECT
+sk_sp<SkImageFilter> SkXfermodeImageFilter::Make(sk_sp<SkXfermode> mode,
+                                                 sk_sp<SkImageFilter> background,
+                                                 sk_sp<SkImageFilter> foreground,
+                                                 const SkImageFilter::CropRect* cropRect) {
+    return Make(mode ? mode->blend() : SkBlendMode::kSrcOver,
+                std::move(background), std::move(foreground), cropRect);
+}
+#endif
+
+SkXfermodeImageFilter_Base::SkXfermodeImageFilter_Base(SkBlendMode mode,
+                                                       sk_sp<SkImageFilter> inputs[2],
+                                                       const CropRect* cropRect)
     : INHERITED(inputs, 2, cropRect)
-    , fMode(std::move(mode)) {
+    , fMode(mode)
+{}
+
+static int unflatten_blendmode(SkReadBuffer& buffer, SkArithmeticParams* arith) {
+    if (buffer.isVersionLT(SkReadBuffer::kXfermodeToBlendMode_Version)) {
+        sk_sp<SkXfermode> xfer = buffer.readXfermode();
+        if (xfer) {
+            if (xfer->isArithmetic(arith)) {
+                return -1;
+            }
+            return (int)xfer->blend();
+        } else {
+            return (int)SkBlendMode::kSrcOver;
+        }
+    } else {
+        uint32_t mode = buffer.read32();
+        (void)buffer.validate(mode <= (unsigned)SkBlendMode::kLastMode);
+        return mode;
+    }
 }
 
 sk_sp<SkFlattenable> SkXfermodeImageFilter_Base::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
-    sk_sp<SkXfermode> mode(buffer.readXfermode());
-    return SkXfermodeImageFilter::Make(std::move(mode), common.getInput(0), common.getInput(1),
-                                       &common.cropRect());
+    SkArithmeticParams arith;
+    int mode = unflatten_blendmode(buffer, &arith);
+    if (mode >= 0) {
+        return SkXfermodeImageFilter::Make((SkBlendMode)mode, common.getInput(0),
+                                           common.getInput(1), &common.cropRect());
+    } else {
+        return SkXfermodeImageFilter::MakeArithmetic(arith.fK[0], arith.fK[1], arith.fK[2],
+                                                     arith.fK[3], arith.fEnforcePMColor,
+                                                     common.getInput(0),
+                                                     common.getInput(1), &common.cropRect());
+    }
 }
 
 void SkXfermodeImageFilter_Base::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
-    buffer.writeFlattenable(fMode.get());
+    buffer.write32((unsigned)fMode);
 }
 
 sk_sp<SkSpecialImage> SkXfermodeImageFilter_Base::onFilterImage(SkSpecialImage* source,
@@ -147,7 +184,7 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter_Base::onFilterImage(SkSpecialImage*
 
     if (background) {
         SkPaint paint;
-        paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+        paint.setBlendMode(SkBlendMode::kSrc);
         background->draw(canvas,
                          SkIntToScalar(backgroundOffset.fX), SkIntToScalar(backgroundOffset.fY),
                          &paint);
@@ -161,7 +198,7 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter_Base::onFilterImage(SkSpecialImage*
 void SkXfermodeImageFilter_Base::drawForeground(SkCanvas* canvas, SkSpecialImage* img,
                                                 const SkIRect& fgBounds) const {
     SkPaint paint;
-    paint.setXfermode(fMode);
+    paint.setBlendMode(fMode);
     if (img) {
         img->draw(canvas, SkIntToScalar(fgBounds.fLeft), SkIntToScalar(fgBounds.fTop), &paint);
     }
@@ -175,11 +212,7 @@ void SkXfermodeImageFilter_Base::drawForeground(SkCanvas* canvas, SkSpecialImage
 #ifndef SK_IGNORE_TO_STRING
 void SkXfermodeImageFilter_Base::toString(SkString* str) const {
     str->appendf("SkXfermodeImageFilter: (");
-    str->appendf("xfermode: (");
-    if (fMode) {
-        fMode->toString(str);
-    }
-    str->append(")");
+    str->appendf("blendmode: (%d)", (int)fMode);
     if (this->getInput(0)) {
         str->appendf("foreground: (");
         this->getInput(0)->toString(str);
@@ -266,7 +299,7 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter_Base::filterImageGPU(
         paint.addColorFragmentProcessor(std::move(bgFP));
     }
 
-    paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
+    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
 
     sk_sp<GrDrawContext> drawContext(
         context->makeDrawContext(SkBackingFit::kApprox, bounds.width(), bounds.height(),
@@ -290,8 +323,9 @@ sk_sp<SkSpecialImage> SkXfermodeImageFilter_Base::filterImageGPU(
 sk_sp<GrFragmentProcessor>
 SkXfermodeImageFilter_Base::makeFGFrag(sk_sp<GrFragmentProcessor> bgFP) const {
     // A null fMode is interpreted to mean kSrcOver_Mode (to match raster).
-    SkAutoTUnref<SkXfermode> mode(SkSafeRef(fMode.get()));
-    if (!mode) {
+    SkXfermode* xfer = SkXfermode::Peek(fMode);
+    sk_sp<SkXfermode> srcover;
+    if (!xfer) {
         // It would be awesome to use SkXfermode::Create here but it knows better
         // than us and won't return a kSrcOver_Mode SkXfermode. That means we
         // have to get one the hard way.
@@ -299,9 +333,11 @@ SkXfermodeImageFilter_Base::makeFGFrag(sk_sp<GrFragmentProcessor> bgFP) const {
         rec.fProc = SkXfermode::GetProc(SkXfermode::kSrcOver_Mode);
         SkXfermode::ModeAsCoeff(SkXfermode::kSrcOver_Mode, &rec.fSC, &rec.fDC);
 
-        mode.reset(new SkProcCoeffXfermode(rec, SkXfermode::kSrcOver_Mode));
+        srcover.reset(new SkProcCoeffXfermode(rec, SkXfermode::kSrcOver_Mode));
+        xfer = srcover.get();
+
     }
-    return mode->makeFragmentProcessorForImageFilter(std::move(bgFP));
+    return xfer->makeFragmentProcessorForImageFilter(std::move(bgFP));
 }
 
 #endif
@@ -312,7 +348,8 @@ class SkArithmeticImageFilter : public SkXfermodeImageFilter_Base {
 public:
     SkArithmeticImageFilter(float k1, float k2, float k3, float k4, bool enforcePMColor,
                             sk_sp<SkImageFilter> inputs[2], const CropRect* cropRect)
-        : SkXfermodeImageFilter_Base(nullptr, inputs, cropRect)
+        // need to pass a blendmode to our inherited constructor, but we ignore it
+        : SkXfermodeImageFilter_Base(SkBlendMode::kSrcOver, inputs, cropRect)
         , fK{ k1, k2, k3, k4 }
         , fEnforcePMColor(enforcePMColor)
     {}
@@ -347,8 +384,11 @@ sk_sp<SkFlattenable> SkArithmeticImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
 
     // skip the mode (srcover) our parent-class wrote
-    sk_sp<SkXfermode> mode(buffer.readXfermode());
-    SkASSERT(nullptr == mode);
+    SkDEBUGCODE(int mode =) unflatten_blendmode(buffer, nullptr);
+    if (!buffer.isValid()) {
+        return nullptr;
+    }
+    SkASSERT(SkBlendMode::kSrcOver == (SkBlendMode)mode);
 
     float k[4];
     for (int i = 0; i < 4; ++i) {
@@ -475,16 +515,16 @@ sk_sp<SkImageFilter> SkXfermodeImageFilter::MakeArithmetic(float k1, float k2, f
     int mode = -1;  // illegal mode
     if (SkScalarNearlyZero(k1) && SkScalarNearlyEqual(k2, SK_Scalar1) &&
         SkScalarNearlyZero(k3) && SkScalarNearlyZero(k4)) {
-        mode = SkXfermode::kSrc_Mode;
+        mode = (int)SkBlendMode::kSrc;
     } else if (SkScalarNearlyZero(k1) && SkScalarNearlyZero(k2) &&
                SkScalarNearlyEqual(k3, SK_Scalar1) && SkScalarNearlyZero(k4)) {
-        mode = SkXfermode::kDst_Mode;
+        mode = (int)SkBlendMode::kDst;
     } else if (SkScalarNearlyZero(k1) && SkScalarNearlyZero(k2) &&
                SkScalarNearlyZero(k3) && SkScalarNearlyZero(k4)) {
-        mode = SkXfermode::kClear_Mode;
+        mode = (int)SkBlendMode::kClear;
     }
     if (mode >= 0) {
-        return SkXfermodeImageFilter::Make(SkXfermode::Make((SkXfermode::Mode)mode),
+        return SkXfermodeImageFilter::Make((SkBlendMode)mode,
                                            std::move(background), std::move(foreground), crop);
     }