VkYcbcrSamplerHelper.h

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/*
 * Copyright 2020 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef VkYcbcrSamplerHelper_DEFINED
#define VkYcbcrSamplerHelper_DEFINED
 
#include "include/core/SkTypes.h"
 
#ifdef SK_VULKAN
 
#include "include/gpu/GrBackendSurface.h"
#include "include/gpu/vk/GrVkTypes.h"
 
class GrDirectContext;
class GrVkGpu;
 
// This helper will create and hold data for a Vulkan YCbCr backend texture. This format is
// particularly interesting because its sampler is immutable.
class VkYcbcrSamplerHelper {
public:
    VkYcbcrSamplerHelper(GrDirectContext*);
    ~VkYcbcrSamplerHelper();
 
    bool isYCbCrSupported();
 
    bool createBackendTexture(uint32_t width, uint32_t height);
 
    const GrBackendTexture& backendTexture() const { return fTexture; }
 
    static int GetExpectedY(int x, int y, int width, int height);
    static std::pair<int, int> GetExpectedUV(int x, int y, int width, int height);
 
private:
    GrVkGpu* vkGpu();
 
    GrDirectContext* fDContext;
 
    VkImage fImage = VK_NULL_HANDLE;
    VkDeviceMemory fImageMemory = VK_NULL_HANDLE;
    GrBackendTexture fTexture;
};
 
#endif // SK_VULKAN
 
#endif // VkYcbcrSamplerHelper_DEFINED