Simplify flattening to just write enough to call the factory

src/effects/gradients/SkTwoPointConicalGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTwoPointConicalGradient.h"
 #include "SkTwoPointConicalGradient_gpu.h"
 
@@ skipping 325 matching lines @@
         info->fRadius[0] = fRadius1;
         info->fRadius[1] = fRadius2;
         if (fFlippedGrad) {
             SkTSwap(info->fPoint[0], info->fPoint[1]);
             SkTSwap(info->fRadius[0], info->fRadius[1]);
         }
     }
     return kConical_GradientType;
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
 SkTwoPointConicalGradient::SkTwoPointConicalGradient(
     SkReadBuffer& buffer)
     : INHERITED(buffer),
     fCenter1(buffer.readPoint()),
     fCenter2(buffer.readPoint()),
     fRadius1(buffer.readScalar()),
     fRadius2(buffer.readScalar()) {
     if (buffer.isVersionLT(SkReadBuffer::kGradientFlippedFlag_Version)) {
         // V23_COMPATIBILITY_CODE
         // Sort gradient by radius size for old pictures
         if (fRadius2 < fRadius1) {
             SkTSwap(fCenter1, fCenter2);
             SkTSwap(fRadius1, fRadius2);
             this->flipGradientColors();
             fFlippedGrad = true;
         } else {
             fFlippedGrad = false;
         }
     } else {
         fFlippedGrad = buffer.readBool();
     }
     this->init();
 };
+#endif
 
-void SkTwoPointConicalGradient::flatten(
-    SkWriteBuffer& buffer) const {
+SkFlattenable* SkTwoPointConicalGradient::CreateProc(SkReadBuffer& buffer) {
+    DescriptorScope desc;
+    if (!desc.unflatten(buffer)) {
+        return NULL;
+    }
+    SkPoint c1 = buffer.readPoint();
+    SkPoint c2 = buffer.readPoint();
+    SkScalar r1 = buffer.readScalar();
+    SkScalar r2 = buffer.readScalar();
+
+    if (buffer.readBool()) {    // flipped
+        SkTSwap(c1, c2);
+        SkTSwap(r1, r2);
+
+        SkColor* colors = desc.mutableColors();
+        SkScalar* pos = desc.mutablePos();
+        const int last = desc.fCount - 1;
+        const int half = desc.fCount >> 1;
+        for (int i = 0; i < half; ++i) {
+            SkTSwap(colors[i], colors[last - i]);
+            if (pos) {
+                SkScalar tmp = pos[i];
+                pos[i] = SK_Scalar1 - pos[last - i];
+                pos[last - i] = SK_Scalar1 - tmp;
+            }
+        }
+        if (pos) {
+            if (desc.fCount & 1) {
+                pos[half] = SK_Scalar1 - pos[half];
+            }
+        }
+    }
+
+    return SkGradientShader::CreateTwoPointConical(c1, r1, c2, r2, desc.fColors, desc.fPos,
+                                                   desc.fCount, desc.fTileMode, desc.fGradFlags,
+                                                   desc.fLocalMatrix);
+}
+
+void SkTwoPointConicalGradient::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writePoint(fCenter1);
     buffer.writePoint(fCenter2);
     buffer.writeScalar(fRadius1);
     buffer.writeScalar(fRadius2);
     buffer.writeBool(fFlippedGrad);
 }
 
 #if SK_SUPPORT_GPU
 
@@ skipping 39 matching lines @@
     str->appendScalar(fCenter2.fY);
     str->append(") radius2: ");
     str->appendScalar(fRadius2);
     str->append(" ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif