text: /*
   * Copyright 2018 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  #ifndef SkImage_Lazy_DEFINED
  #  define SkImage_Lazy_DEFINED
  #  include "include/private/SkMutex.h"
  #  include "src/image/SkImage_Base.h"
  #  if  SK_SUPPORT_GPU
  #    include "src/gpu/GrTextureMaker.h"
  #  endif
  class SharedGenerator;
  class SkImage_Lazy : public SkImage_Base
  {
  public:
    struct Validator
    {
      Validator(sk_sp<SharedGenerator>, const SkIRect* subset, const SkColorType* colorType, sk_sp<SkColorSpace> colorSpace);
      operator bool() const
      {
        return fSharedGenerator.get();
      }
      sk_sp<SharedGenerator> fSharedGenerator;
      SkImageInfo fInfo;
      SkIPoint fOrigin;
      sk_sp<SkColorSpace> fColorSpace;
      uint32_t fUniqueID;
    };
    SkImage_Lazy(Validator* validator);
    virtual ~SkImage_Lazy();
    SkIRect onGetSubset() const override
    {
      return SkIRect::MakeXYWH(fOrigin.fX, fOrigin.fY, this->width(), this->height());
    }
    bool onReadPixels(const SkImageInfo&, void*, size_t, int srcX, int srcY, CachingHint) const override;
  #  if  SK_SUPPORT_GPU
    sk_sp<GrTextureProxy> asTextureProxyRef(GrRecordingContext*, const GrSamplerState&, SkScalar scaleAdjust[2]) const override;
    sk_sp<SkCachedData> getPlanes(SkYUVASizeInfo*, SkYUVAIndex[4], SkYUVColorSpace*, const void* planes[4]) override;
  #  endif
    sk_sp<SkData> onRefEncoded() const override;
    sk_sp<SkImage> onMakeSubset(GrRecordingContext*, const SkIRect&) const override;
    bool getROPixels(SkBitmap*, CachingHint) const override;
    bool onIsLazyGenerated() const override
    {
      return true;
    }
    sk_sp<SkImage> onMakeColorTypeAndColorSpace(GrRecordingContext*, SkColorType, sk_sp<SkColorSpace>) const override;
    sk_sp<SkImage> onReinterpretColorSpace(sk_sp<SkColorSpace>) const final;
    bool onIsValid(GrContext*) const override;
  #  if  SK_SUPPORT_GPU
      // Returns the texture proxy. If we're going to generate and cache the texture, we should use
      // the passed in key (if the key is valid). If genType is AllowedTexGenType::kCheap and the
      // texture is not trivial to construct, returns nullptr.
    sk_sp<GrTextureProxy> lockTextureProxy(GrRecordingContext*, const GrUniqueKey& key, SkImage::CachingHint, bool willBeMipped, GrTextureMaker::AllowedTexGenType genType) const;
    void makeCacheKeyFromOrigKey(const GrUniqueKey& origKey, GrUniqueKey* cacheKey) const;
  #  endif
  private:
    class ScopedGenerator;
      // Note that this->imageInfo() is not necessarily the info from the generator. It may be
      // cropped by onMakeSubset and its color type/space may be changed by
      // onMakeColorTypeAndColorSpace.
    sk_sp<SharedGenerator> fSharedGenerator;
    const SkIPoint fOrigin;
    uint32_t fUniqueID;
      // Repeated calls to onMakeColorTypeAndColorSpace will result in a proliferation of unique IDs
      // and SkImage_Lazy instances. Cache the result of the last successful call.
    mutable SkMutex fOnMakeColorTypeAndSpaceMutex;
    mutable sk_sp<SkImage> fOnMakeColorTypeAndSpaceResult;
  #  if  SK_SUPPORT_GPU
      // When the SkImage_Lazy goes away, we will iterate over all the unique keys we've used and
      // send messages to the GrContexts to say the unique keys are no longer valid. The GrContexts
      // can then release the resources, conntected with the those unique keys, from their caches.
    mutable SkTDArray<GrUniqueKeyInvalidatedMessage*> fUniqueKeyInvalidatedMessages;
  #  endif
    typedef SkImage_Base INHERITED;
  };
  #endif
  