Use SkArenaAlloc in the SkAutoBlitterChoose code.

- Added default implementation of onMakeContext to support use in android.

Searches for uses:
"public SkShader"  package:^chromium$ -file:^src/third_party/skia
package:^aosp.* "public SkShader"  -file:external/skia -file:.*third_party/skia
package:^android$ "public SkShader"  -file:external/skia -file:.*third_party/skia

... shows that no subclass overrides onCreateContext.

TBR=reed@google.com
TBR=mtklein@google.com

Change-Id: I8bd5f57a79534574e344b165d31dccee41c31767
Reviewed-on: https://skia-review.googlesource.com/8140
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Herb Derby <herb@google.com>

1 files changed, 5 insertions, 12 deletions

diff --git a/src/core/SkColorFilterShader.cpp b/src/core/SkColorFilterShader.cpp
index 4090a18b45..5e96b24b41 100644
--- a/src/core/SkColorFilterShader.cpp
+++ b/src/core/SkColorFilterShader.cpp
@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 
+#include "SkArenaAlloc.h"
 #include "SkColorFilterShader.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ -52,19 +53,15 @@ uint32_t SkColorFilterShader::FilterShaderContext::getFlags() const {
     return shaderF;
 }
 
-SkShader::Context* SkColorFilterShader::onCreateContext(const ContextRec& rec,
-                                                        void* storage) const {
-    char* shaderContextStorage = (char*)storage + sizeof(FilterShaderContext);
-    SkShader::Context* shaderContext = fShader->createContext(rec, shaderContextStorage);
+SkShader::Context* SkColorFilterShader::onMakeContext(const ContextRec& rec,
+                                                      SkArenaAlloc* alloc) const {
+    SkShader::Context* shaderContext = fShader->makeContext(rec, alloc);
     if (nullptr == shaderContext) {
         return nullptr;
     }
-    return new (storage) FilterShaderContext(*this, shaderContext, rec);
+    return alloc->make<FilterShaderContext>(*this, shaderContext, rec);
 }
 
-size_t SkColorFilterShader::onContextSize(const ContextRec& rec) const {
-    return sizeof(FilterShaderContext) + fShader->contextSize(rec);
-}
 
 SkColorFilterShader::FilterShaderContext::FilterShaderContext(
                                                          const SkColorFilterShader& filterShader,
@@ -74,10 +71,6 @@ SkColorFilterShader::FilterShaderContext::FilterShaderContext(
     , fShaderContext(shaderContext)
 {}
 
-SkColorFilterShader::FilterShaderContext::~FilterShaderContext() {
-    fShaderContext->~Context();
-}
-
 void SkColorFilterShader::FilterShaderContext::shadeSpan(int x, int y, SkPMColor result[],
                                                          int count) {
     const SkColorFilterShader& filterShader = static_cast<const SkColorFilterShader&>(fShader);