implement isABitmap for imageshader, return localmatrix for bitmap's impl

src/image/SkImageShader.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcShader.h"
 #include "SkBitmapProvider.h"
 #include "SkImage_Base.h"
@@ skipping 33 matching lines @@
 
 size_t SkImageShader::onContextSize(const ContextRec& rec) const {
     return SkBitmapProcShader::ContextSize(rec, SkBitmapProvider(fImage).info());
 }
 
 SkShader::Context* SkImageShader::onCreateContext(const ContextRec& rec, void* storage) const {
     return SkBitmapProcShader::MakeContext(*this, fTileModeX, fTileModeY,
                                            SkBitmapProvider(fImage), rec, storage);
 }
 
+SkImage* SkImageShader::onIsAImage(SkMatrix* texM, TileMode xy[]) const {
+    if (texM) {
+        *texM = this->getLocalMatrix();
+    }
+    if (xy) {
+        xy[0] = (TileMode)fTileModeX;
+        xy[1] = (TileMode)fTileModeY;
+    }
+    return const_cast<SkImage*>(fImage.get());
+}
+
+bool SkImageShader::onIsABitmap(SkBitmap* texture, SkMatrix* texM, TileMode xy[]) const {
+    const SkBitmap* bm = as_IB(fImage)->onPeekBitmap();
+    if (!bm) {
+        return false;
+    }
+
+    if (texture) {
+        *texture = *bm;
+    }
+    if (texM) {
+        *texM = this->getLocalMatrix();
+    }
+    if (xy) {
+        xy[0] = (TileMode)fTileModeX;
+        xy[1] = (TileMode)fTileModeY;
+    }
+    return true;
+}
+
 sk_sp<SkShader> SkImageShader::Make(const SkImage* image, TileMode tx, TileMode ty,
                                     const SkMatrix* localMatrix) {
     if (!image) {
         return nullptr;
     }
     return sk_sp<SkShader>(new SkImageShader(image, tx, ty, localMatrix));
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkImageShader::toString(SkString* str) const {
@@ skipping 60 matching lines @@
         inner = GrSimpleTextureEffect::Make(texture, nullptr, matrix, params);
     }
 
     if (GrPixelConfigIsAlphaOnly(texture->config())) {
         return inner;
     }
     return sk_sp<GrFragmentProcessor>(GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)));
 }
 
 #endif