Revert[7] "replace SkXfermode obj with SkBlendMode enum in paints"

This reverts commit Ib4a154cdd5f5d1dcac921ef50d53b79a2d6a1be8.

Reason for revert: new assert from 100K bot

Original change's description:
> Revert[6] "replace SkXfermode obj with SkBlendMode enum in paints"
> 
> - perform version check in CreateProc for XfermodeImageFilter and ArithmeticImageFilter
> This reverts commit 3ed485f4249e17abb4b11f5018d03175fd1afb44.
> 
> BUG=skia:
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2992
> 
> Change-Id: Ib4a154cdd5f5d1dcac921ef50d53b79a2d6a1be8
> Reviewed-on: https://skia-review.googlesource.com/2992
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Mike Reed <reed@google.com>
> 

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

Change-Id: I848e5a69c5cd67f2c14889f4f0a346652578c4ff
Reviewed-on: https://skia-review.googlesource.com/3023
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>

3 files changed, 44 insertions, 6 deletions

diff --git a/src/utils/SkDumpCanvas.cpp b/src/utils/SkDumpCanvas.cpp
index 68bd13eccb..fcb24d28c4 100644
--- a/src/utils/SkDumpCanvas.cpp
+++ b/src/utils/SkDumpCanvas.cpp
@@ -209,8 +209,8 @@ SkCanvas::SaveLayerStrategy SkDumpCanvas::getSaveLayerStrategy(const SaveLayerRe
         if (paint->getAlpha() != 0xFF) {
             str.appendf(" alpha:0x%02X", paint->getAlpha());
         }
-        if (!paint->isSrcOver()) {
-            str.appendf(" blendmode:%d", paint->getBlendMode());
+        if (paint->getXfermode()) {
+            str.appendf(" xfermode:%p", paint->getXfermode());
         }
     }
     this->dump(kSave_Verb, paint, str.c_str());
@@ -540,10 +540,8 @@ void SkFormatDumper::dump(SkDumpCanvas* canvas, SkDumpCanvas::Verb verb,
 
     if (p) {
         msg.appendf(" color:0x%08X flags:%X", p->getColor(), p->getFlags());
-        if (!p->isSrcOver()) {
-            msg.appendf(" blendmode:%d", p->getBlendMode());
-        }
         appendFlattenable(&msg, p->getShader(), "shader");
+        appendFlattenable(&msg, p->getXfermode(), "xfermode");
         appendFlattenable(&msg, p->getPathEffect(), "pathEffect");
         appendFlattenable(&msg, p->getMaskFilter(), "maskFilter");
         appendFlattenable(&msg, p->getPathEffect(), "pathEffect");
diff --git a/src/utils/SkLua.cpp b/src/utils/SkLua.cpp
index ba311af61c..e80708c71c 100644
--- a/src/utils/SkLua.cpp
+++ b/src/utils/SkLua.cpp
@@ -28,6 +28,7 @@
 #include "SkSurface.h"
 #include "SkTextBlob.h"
 #include "SkTypeface.h"
+#include "SkXfermode.h"
 
 extern "C" {
     #include "lua.h"
@@ -58,6 +59,7 @@ DEF_MTNAME(SkShader)
 DEF_MTNAME(SkSurface)
 DEF_MTNAME(SkTextBlob)
 DEF_MTNAME(SkTypeface)
+DEF_MTNAME(SkXfermode)
 
 template <typename T> T* push_new(lua_State* L) {
     T* addr = (T*)lua_newuserdata(L, sizeof(T));
@@ -1071,9 +1073,26 @@ static int lpaint_getEffects(lua_State* L) {
     setfield_bool_if(L, "shader",      !!paint->getShader());
     setfield_bool_if(L, "colorFilter", !!paint->getColorFilter());
     setfield_bool_if(L, "imageFilter", !!paint->getImageFilter());
+    setfield_bool_if(L, "xfermode",    !!paint->getXfermode());
     return 1;
 }
 
+static int lpaint_getXfermode(lua_State* L) {
+    const SkPaint* paint = get_obj<SkPaint>(L, 1);
+    SkXfermode* xfermode = paint->getXfermode();
+    if (xfermode) {
+        push_ref(L, xfermode);
+        return 1;
+    }
+    return 0;
+}
+
+static int lpaint_setXfermode(lua_State* L) {
+    SkPaint* paint = get_obj<SkPaint>(L, 1);
+    paint->setXfermode(sk_ref_sp(get_ref<SkXfermode>(L, 2)));
+    return 0;
+}
+
 static int lpaint_getColorFilter(lua_State* L) {
     const SkPaint* paint = get_obj<SkPaint>(L, 1);
     SkColorFilter* cf = paint->getColorFilter();
@@ -1198,6 +1217,8 @@ static const struct luaL_Reg gSkPaint_Methods[] = {
     { "setColorFilter", lpaint_setColorFilter },
     { "getImageFilter", lpaint_getImageFilter },
     { "setImageFilter", lpaint_setImageFilter },
+    { "getXfermode", lpaint_getXfermode },
+    { "setXfermode", lpaint_setXfermode },
     { "getShader", lpaint_getShader },
     { "setShader", lpaint_setShader },
     { "getPathEffect", lpaint_getPathEffect },
@@ -1320,6 +1341,24 @@ static const struct luaL_Reg gSkPathEffect_Methods[] = {
 
 ///////////////////////////////////////////////////////////////////////////////
 
+static int lpxfermode_getTypeName(lua_State* L) {
+    lua_pushstring(L, get_ref<SkXfermode>(L, 1)->getTypeName());
+    return 1;
+}
+
+static int lpxfermode_gc(lua_State* L) {
+    get_ref<SkXfermode>(L, 1)->unref();
+    return 0;
+}
+
+static const struct luaL_Reg gSkXfermode_Methods[] = {
+    { "getTypeName",    lpxfermode_getTypeName },
+    { "__gc",           lpxfermode_gc },
+    { nullptr, nullptr }
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
 static int lpcolorfilter_gc(lua_State* L) {
     get_ref<SkColorFilter>(L, 1)->unref();
     return 0;
@@ -2139,6 +2178,7 @@ void SkLua::Load(lua_State* L) {
     REG_CLASS(L, SkSurface);
     REG_CLASS(L, SkTextBlob);
     REG_CLASS(L, SkTypeface);
+    REG_CLASS(L, SkXfermode);
 }
 
 extern "C" int luaopen_skia(lua_State* L);
diff --git a/src/utils/SkRGBAToYUV.cpp b/src/utils/SkRGBAToYUV.cpp
index 0528b144f0..63d9152362 100644
--- a/src/utils/SkRGBAToYUV.cpp
+++ b/src/utils/SkRGBAToYUV.cpp
@@ -45,7 +45,7 @@ bool SkRGBAToYUV(const SkImage* image, const SkISize sizes[3], void* const plane
         }
         SkPaint paint;
         paint.setFilterQuality(kLow_SkFilterQuality);
-        paint.setBlendMode(SkBlendMode::kSrc);
+        paint.setXfermodeMode(SkXfermode::kSrc_Mode);
         int rowStartIdx = 5 * i;
         const SkScalar* row = kYUVColorSpaceInvMatrices[colorSpace] + rowStartIdx;
         paint.setColorFilter(