src/cobalt/renderer/rasterizer/skia/skia/src/effects/SkNV122RGBShader.h

// Copyright 2016 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COBALT_RENDERER_RASTERIZER_SKIA_SKIA_SRC_EFFECTS_SKNV122RGBSHADER_H_
#define COBALT_RENDERER_RASTERIZER_SKIA_SKIA_SRC_EFFECTS_SKNV122RGBSHADER_H_

#include "third_party/skia/src/shaders/SkShaderBase.h"

#include "third_party/skia/src/shaders/SkImageShader.h"

class SkNV122RGBShader : public SkShaderBase {
 public:
  SkNV122RGBShader(SkYUVColorSpace color_space, const sk_sp<SkImage>& y_image,
                   const SkMatrix& y_matrix, const sk_sp<SkImage>& uv_image,
                   const SkMatrix& uv_matrix);
  virtual ~SkNV122RGBShader();

  class NV122RGBShaderContext : public SkShaderBase::Context {
   public:
    // Takes ownership of shaderContext and calls its destructor.
    NV122RGBShaderContext(SkYUVColorSpace color_space,
                          const SkNV122RGBShader& yuv2rgb_shader,
                          SkShaderBase::Context* y_shader_context,
                          SkShaderBase::Context* uv_shader_context,
                          const ContextRec& rec);
    virtual ~NV122RGBShaderContext();

    uint32_t getFlags() const override;

    void shadeSpan(int x, int y, SkPMColor[], int count) override;

   private:
    SkYUVColorSpace color_space_;

    SkShaderBase::Context* y_shader_context_;
    SkShaderBase::Context* uv_shader_context_;

    typedef SkShaderBase::Context INHERITED;
  };

#if SK_SUPPORT_GPU
  std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(
      const GrFPArgs&) const override;
#endif

  SK_FLATTENABLE_HOOKS(SkNV122RGBShader)

 protected:
  void flatten(SkWriteBuffer&) const override;

 private:
  void InitializeShaders();

  SkYUVColorSpace color_space_;

  sk_sp<SkImage> y_image_;
  SkMatrix y_matrix_;
  sk_sp<SkImageShader> y_shader_;

  sk_sp<SkImage> uv_image_;
  SkMatrix uv_matrix_;
  sk_sp<SkImageShader> uv_shader_;

  typedef SkShaderBase INHERITED;
};

#endif  // COBALT_RENDERER_RASTERIZER_SKIA_SKIA_SRC_EFFECTS_SKNV122RGBSHADER_H_