Refactoring of GPU NormalMap handling out into its own class

src/core/SkBitmapProcShader.cpp

 /*
  * Copyright 2011 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 "SkBitmapProcState.h"
 #include "SkBitmapProvider.h"
@@ skipping 285 matching lines @@
     buffer.writeMatrix(this->getLocalMatrix());
     buffer.writeBitmap(fRawBitmap);
     buffer.writeUInt(fTileModeX);
     buffer.writeUInt(fTileModeY);
 }
 
 bool SkBitmapProcShader::isOpaque() const {
     return fRawBitmap.isOpaque();
 }
 
+bool SkBitmapProcShader::bitmapIsTooBig(const SkBitmap& bm) {
+    // SkBitmapProcShader stores bitmap coordinates in a 16bit buffer, as it
+    // communicates between its matrix-proc and its sampler-proc. Until we can
+    // widen that, we have to reject bitmaps that are larger.
+    //
+    static const int kMaxSize = 65535;
+
+    return bm.width() > kMaxSize || bm.height() > kMaxSize;
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 #include "SkUnPreMultiply.h"
 #include "SkColorShader.h"
 #include "SkEmptyShader.h"
 
 // returns true and set color if the bitmap can be drawn as a single color
 // (for efficiency)
 static bool can_use_color_shader(const SkBitmap& bm, SkColor* color) {
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
@@ skipping 144 matching lines @@
         inner = GrSimpleTextureEffect::Make(texture, matrix, params);
     }
 
     if (kAlpha_8_SkColorType == fRawBitmap.colorType()) {
         return GrFragmentProcessor::MulOutputByInputUnpremulColor(std::move(inner));
     }
     return GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner));
 }
 
 #endif