Revert of Revert of remove colorfilter native-565 support. complicating w/ no real value. (patchset #1 id:1 of https://codereview.chromium.org/1022673007/)

Reason for revert:
fix for chrome has landed...

Original issue's description:
> Revert of remove colorfilter native-565 support. complicating w/ no real value. (patchset #2 id:20001 of https://codereview.chromium.org/1015533011/)
>
> Reason for revert:
> skia/ext/benchmarking_canvas.cc references HasFilter16 :(
>
> Original issue's description:
> > remove colorfilter native-565 support. complicating w/ no real value.
> >
> > BUG=skia:
> > TBR=
> >
> > Committed: https://skia.googlesource.com/skia/+/2151353d161fe389cdc0db62cfe1932c7680f710
>
> TBR=reed@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/92b47c49016749249ff8521e424c4373b4a74241

TBR=reed@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1016103004

1 files changed, 10 insertions, 44 deletions

diff --git a/src/effects/SkColorFilters.cpp b/src/effects/SkColorFilters.cpp
index 8bcd0ebc5d..8c021e452b 100644
--- a/src/effects/SkColorFilters.cpp
+++ b/src/effects/SkColorFilters.cpp
@@ -27,7 +27,14 @@ bool SkModeColorFilter::asColorMode(SkColor* color, SkXfermode::Mode* mode) cons
 }
 
 uint32_t SkModeColorFilter::getFlags() const {
-    return fProc16 ? (kAlphaUnchanged_Flag | kHasFilter16_Flag) : 0;
+    switch (fMode) {
+        case SkXfermode::kDst_Mode:      //!< [Da, Dc]
+        case SkXfermode::kSrcATop_Mode:  //!< [Da, Sc * Da + (1 - Sa) * Dc]
+            return kAlphaUnchanged_Flag;
+        default:
+            break;
+    }
+    return 0;
 }
 
 void SkModeColorFilter::filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const {
@@ -39,16 +46,6 @@ void SkModeColorFilter::filterSpan(const SkPMColor shader[], int count, SkPMColo
     }
 }
 
-void SkModeColorFilter::filterSpan16(const uint16_t shader[], int count, uint16_t result[]) const {
-    SkASSERT(this->getFlags() & kHasFilter16_Flag);
-    
-    SkPMColor        color = fPMColor;
-    SkXfermodeProc16 proc16 = fProc16;
-    
-    for (int i = 0; i < count; i++) {
-        result[i] = proc16(color, shader[i]);
-    }
-}
 void SkModeColorFilter::flatten(SkWriteBuffer& buffer) const {
     buffer.writeColor(fColor);
     buffer.writeUInt(fMode);
@@ -57,7 +54,6 @@ void SkModeColorFilter::flatten(SkWriteBuffer& buffer) const {
 void SkModeColorFilter::updateCache() {
     fPMColor = SkPreMultiplyColor(fColor);
     fProc = SkXfermode::GetProc(fMode);
-    fProc16 = SkXfermode::GetProc16(fMode, fColor);
 }
 
 SkFlattenable* SkModeColorFilter::CreateProc(SkReadBuffer& buffer) {
@@ -388,25 +384,10 @@ class Src_SkModeColorFilter : public SkModeColorFilter {
 public:
     Src_SkModeColorFilter(SkColor color) : INHERITED(color, SkXfermode::kSrc_Mode) {}
 
-    uint32_t getFlags() const SK_OVERRIDE {
-        if (SkGetPackedA32(this->getPMColor()) == 0xFF) {
-            return kAlphaUnchanged_Flag | kHasFilter16_Flag;
-        } else {
-            return 0;
-        }
-    }
-
-    virtual void filterSpan(const SkPMColor shader[], int count,
-                            SkPMColor result[]) const SK_OVERRIDE {
+    void filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const SK_OVERRIDE {
         sk_memset32(result, this->getPMColor(), count);
     }
 
-    virtual void filterSpan16(const uint16_t shader[], int count,
-                              uint16_t result[]) const SK_OVERRIDE {
-        SkASSERT(this->getFlags() & kHasFilter16_Flag);
-        sk_memset16(result, SkPixel32ToPixel16(this->getPMColor()), count);
-    }
-
 private:
     typedef SkModeColorFilter INHERITED;
 };
@@ -418,25 +399,10 @@ public:
         fColor32Proc = SkBlitRow::ColorProcFactory();
     }
 
-    uint32_t getFlags() const SK_OVERRIDE {
-        if (SkGetPackedA32(this->getPMColor()) == 0xFF) {
-            return kAlphaUnchanged_Flag | kHasFilter16_Flag;
-        } else {
-            return 0;
-        }
-    }
-
-    virtual void filterSpan(const SkPMColor shader[], int count,
-                            SkPMColor result[]) const SK_OVERRIDE {
+    void filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const SK_OVERRIDE {
         fColor32Proc(result, shader, count, this->getPMColor());
     }
 
-    virtual void filterSpan16(const uint16_t shader[], int count,
-                              uint16_t result[]) const SK_OVERRIDE {
-        SkASSERT(this->getFlags() & kHasFilter16_Flag);
-        sk_memset16(result, SkPixel32ToPixel16(this->getPMColor()), count);
-    }
-
 private:
 
     SkBlitRow::ColorProc fColor32Proc;