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>

1 files changed, 17 insertions, 24 deletions

diff --git a/src/core/SkRecordDraw.cpp b/src/core/SkRecordDraw.cpp
index ca9c1b6f78..dca19df100 100644
--- a/src/core/SkRecordDraw.cpp
+++ b/src/core/SkRecordDraw.cpp
@@ -341,34 +341,27 @@ private:
                 return true;
             }
 
-            // Unusual Xfermodes require us to process a saved layer
+            // Unusual blendmodes require us to process a saved layer
             // even with operations outisde the clip.
             // For example, DstIn is used by masking layers.
             // https://code.google.com/p/skia/issues/detail?id=1291
             // https://crbug.com/401593
-            SkXfermode* xfermode = paint->getXfermode();
-            SkXfermode::Mode mode;
-            // SrcOver is ok, and is also the common case with a nullptr xfermode.
-            // So we should make that the fast path and bypass the mode extraction
-            // and test.
-            if (xfermode && xfermode->asMode(&mode)) {
-                switch (mode) {
-                    // For each of the following transfer modes, if the source
-                    // alpha is zero (our transparent black), the resulting
-                    // blended alpha is not necessarily equal to the original
-                    // destination alpha.
-                    case SkXfermode::kClear_Mode:
-                    case SkXfermode::kSrc_Mode:
-                    case SkXfermode::kSrcIn_Mode:
-                    case SkXfermode::kDstIn_Mode:
-                    case SkXfermode::kSrcOut_Mode:
-                    case SkXfermode::kDstATop_Mode:
-                    case SkXfermode::kModulate_Mode:
-                        return true;
-                        break;
-                    default:
-                        break;
-                }
+            switch (paint->getBlendMode()) {
+                // For each of the following transfer modes, if the source
+                // alpha is zero (our transparent black), the resulting
+                // blended alpha is not necessarily equal to the original
+                // destination alpha.
+                case SkBlendMode::kClear:
+                case SkBlendMode::kSrc:
+                case SkBlendMode::kSrcIn:
+                case SkBlendMode::kDstIn:
+                case SkBlendMode::kSrcOut:
+                case SkBlendMode::kDstATop:
+                case SkBlendMode::kModulate:
+                    return true;
+                    break;
+                default:
+                    break;
             }
         }
         return false;