text: /*
   * Copyright 2012 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #include "include/core/SkBitmap.h"
  #include "include/core/SkCanvas.h"
  #include "include/core/SkData.h"
  #include "include/core/SkImageEncoder.h"
  #include "include/core/SkImageFilter.h"
  #include "include/core/SkImageGenerator.h"
  #include "include/core/SkPicture.h"
  #include "include/core/SkString.h"
  #include "include/core/SkSurface.h"
  #include "src/core/SkBitmapCache.h"
  #include "src/core/SkCachedData.h"
  #include "src/core/SkColorSpacePriv.h"
  #include "src/core/SkImageFilterCache.h"
  #include "src/core/SkImageFilter_Base.h"
  #include "src/core/SkImagePriv.h"
  #include "src/core/SkNextID.h"
  #include "src/core/SkSpecialImage.h"
  #include "src/image/SkImage_Base.h"
  #include "src/image/SkReadPixelsRec.h"
  #include "src/shaders/SkImageShader.h"
  
  #if SK_SUPPORT_GPU
  #include "include/gpu/GrContext.h"
  #include "include/gpu/GrTexture.h"
  #include "src/image/SkImage_Gpu.h"
  #endif
  #include "include/gpu/GrBackendSurface.h"
  
  SkImage::SkImage(const SkImageInfo& info, uint32_t uniqueID)
          : fInfo(info)
          , fUniqueID(kNeedNewImageUniqueID == uniqueID ? SkNextID::ImageID() : uniqueID) {
      SkASSERT(info.width() > 0);
      SkASSERT(info.height() > 0);
  }
  
  bool SkImage::peekPixels(SkPixmap* pm) const {
      SkPixmap tmp;
      if (!pm) {
          pm = &tmp;
      }
      return as_IB(this)->onPeekPixels(pm);
  }
  
  bool SkImage::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, int srcX,
                           int srcY, CachingHint chint) const {
      return as_IB(this)->onReadPixels(dstInfo, dstPixels, dstRowBytes, srcX, srcY, chint);
  }
  
  bool SkImage::scalePixels(const SkPixmap& dst, SkFilterQuality quality, CachingHint chint) const {
      if (this->width() == dst.width() && this->height() == dst.height()) {
          return this->readPixels(dst, 0, 0, chint);
      }
  
      // Idea: If/when SkImageGenerator supports a native-scaling API (where the generator itself
      //       can scale more efficiently) we should take advantage of it here.
      //
      SkBitmap bm;
      if (as_IB(this)->getROPixels(&bm, chint)) {
          SkPixmap pmap;
          // Note: By calling the pixmap scaler, we never cache the final result, so the chint
          //       is (currently) only being applied to the getROPixels. If we get a request to
          //       also attempt to cache the final (scaled) result, we would add that logic here.
          //
          return bm.peekPixels(&pmap) && pmap.scalePixels(dst, quality);
      }
      return false;
  }
  
  ///////////////////////////////////////////////////////////////////////////////////////////////////
  
  SkColorType SkImage::colorType() const { return fInfo.colorType(); }
  
  SkAlphaType SkImage::alphaType() const { return fInfo.alphaType(); }
  
  SkColorSpace* SkImage::colorSpace() const { return fInfo.colorSpace(); }
  
  sk_sp<SkColorSpace> SkImage::refColorSpace() const { return fInfo.refColorSpace(); }
  
  sk_sp<SkShader> SkImage::makeShader(SkTileMode tmx, SkTileMode tmy,
                                      const SkMatrix* localMatrix) const {
      return SkImageShader::Make(sk_ref_sp(const_cast<SkImage*>(this)), tmx, tmy, localMatrix);
  }
  
  sk_sp<SkData> SkImage::encodeToData(SkEncodedImageFormat type, int quality) const {
      SkBitmap bm;
      if (as_IB(this)->getROPixels(&bm)) {
          return SkEncodeBitmap(bm, type, quality);
      }
      return nullptr;
  }
  
  sk_sp<SkData> SkImage::encodeToData() const {
      if (auto encoded = this->refEncodedData()) {
          return encoded;
      }
  
      return this->encodeToData(SkEncodedImageFormat::kPNG, 100);
  }
  
  sk_sp<SkData> SkImage::refEncodedData() const {
      return sk_sp<SkData>(as_IB(this)->onRefEncoded());
  }
  
  sk_sp<SkImage> SkImage::MakeFromEncoded(sk_sp<SkData> encoded, const SkIRect* subset) {
      if (nullptr == encoded || 0 == encoded->size()) {
          return nullptr;
      }
      return SkImage::MakeFromGenerator(SkImageGenerator::MakeFromEncoded(std::move(encoded)),
                                        subset);
  }
  
  ///////////////////////////////////////////////////////////////////////////////////////////////////
  
  sk_sp<SkImage> SkImage::makeSubset(const SkIRect& subset) const {
      if (subset.isEmpty()) {
          return nullptr;
      }
  
      const SkIRect bounds = SkIRect::MakeWH(this->width(), this->height());
      if (!bounds.contains(subset)) {
          return nullptr;
      }
  
      // optimization : return self if the subset == our bounds
      if (bounds == subset) {
          return sk_ref_sp(const_cast<SkImage*>(this));
      }
  
      // CONTEXT TODO: propagate the context parameter to the top-level API
  #if SK_SUPPORT_GPU
      return as_IB(this)->onMakeSubset(as_IB(this)->context(), subset);
  #else
      return as_IB(this)->onMakeSubset(nullptr, subset);
  #endif
  }
  
  #if SK_SUPPORT_GPU
  
  GrTexture* SkImage::getTexture() const {
      return as_IB(this)->onGetTexture();
  }
  
  bool SkImage::isTextureBacked() const { return as_IB(this)->onIsTextureBacked(); }
  
  GrBackendTexture SkImage::getBackendTexture(bool flushPendingGrContextIO,
                                              GrSurfaceOrigin* origin) const {
      return as_IB(this)->onGetBackendTexture(flushPendingGrContextIO, origin);
  }
  
  bool SkImage::isValid(GrContext* context) const {
      if (context && context->abandoned()) {
          return false;
      }
      return as_IB(this)->onIsValid(context);
  }
  
  GrSemaphoresSubmitted SkImage::flush(GrContext* context, const GrFlushInfo& flushInfo) {
      return as_IB(this)->onFlush(context, flushInfo);
  }
  
  void SkImage::flush(GrContext* context) { as_IB(this)->onFlush(context, {}); }
  
  #else
  
  GrTexture* SkImage::getTexture() const { return nullptr; }
  
  bool SkImage::isTextureBacked() const { return false; }
  
  GrBackendTexture SkImage::getBackendTexture(bool flushPendingGrContextIO,
                                              GrSurfaceOrigin* origin) const {
      return GrBackendTexture(); // invalid
  }
  
  bool SkImage::isValid(GrContext* context) const {
      if (context) {
          return false;
      }
      return as_IB(this)->onIsValid(context);
  }
  
  GrSemaphoresSubmitted SkImage::flush(GrContext*, const GrFlushInfo&) {
      return GrSemaphoresSubmitted::kNo;
  }
  
  void SkImage::flush(GrContext*) {}
  
  #endif
  
  ///////////////////////////////////////////////////////////////////////////////
  
  SkImage_Base::SkImage_Base(const SkImageInfo& info, uint32_t uniqueID)
          : INHERITED(info, uniqueID), fAddedToRasterCache(false) {}
  
  SkImage_Base::~SkImage_Base() {
      if (fAddedToRasterCache.load()) {
          SkNotifyBitmapGenIDIsStale(this->uniqueID());
      }
  }
  
  GrBackendTexture SkImage_Base::onGetBackendTexture(bool flushPendingGrContextIO,
                                                     GrSurfaceOrigin* origin) const {
      return GrBackendTexture(); // invalid
  }
  
  bool SkImage::readPixels(const SkPixmap& pmap, int srcX, int srcY, CachingHint chint) const {
      return this->readPixels(pmap.info(), pmap.writable_addr(), pmap.rowBytes(), srcX, srcY, chint);
  }
  
  ///////////////////////////////////////////////////////////////////////////////////////////////////
  
  sk_sp<SkImage> SkImage::MakeFromBitmap(const SkBitmap& bm) {
      if (!bm.pixelRef()) {
          return nullptr;
      }
  
      return SkMakeImageFromRasterBitmap(bm, kIfMutable_SkCopyPixelsMode);
  }
  
  bool SkImage::asLegacyBitmap(SkBitmap* bitmap, LegacyBitmapMode ) const {
      return as_IB(this)->onAsLegacyBitmap(bitmap);
  }
  
  sk_sp<SkCachedData> SkImage_Base::getPlanes(SkYUVASizeInfo*, SkYUVAIndex[4],
                                              SkYUVColorSpace*, const void*[4]) {
      return nullptr;
  }
  
  bool SkImage_Base::onAsLegacyBitmap(SkBitmap* bitmap) const {
      // As the base-class, all we can do is make a copy (regardless of mode).
      // Subclasses that want to be more optimal should override.
      SkImageInfo info = fInfo.makeColorType(kN32_SkColorType).makeColorSpace(nullptr);
      if (!bitmap->tryAllocPixels(info)) {
          return false;
      }
      if (!this->readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(), 0, 0)) {
          bitmap->reset();
          return false;
      }
  
      bitmap->setImmutable();
      return true;
  }
  
  sk_sp<SkImage> SkImage::MakeFromPicture(sk_sp<SkPicture> picture, const SkISize& dimensions,
                                          const SkMatrix* matrix, const SkPaint* paint,
                                          BitDepth bitDepth, sk_sp<SkColorSpace> colorSpace) {
      return MakeFromGenerator(SkImageGenerator::MakeFromPicture(dimensions, std::move(picture),
                                                                 matrix, paint, bitDepth,
                                                                 std::move(colorSpace)));
  }
  
  sk_sp<SkImage> SkImage::makeWithFilter(const SkImageFilter* filter, const SkIRect& subset,
                                         const SkIRect& clipBounds, SkIRect* outSubset,
                                         SkIPoint* offset) const {
      GrContext* context = as_IB(this)->context();
  
      return this->makeWithFilter(context, filter, subset, clipBounds, outSubset, offset);
  }
  
  sk_sp<SkImage> SkImage::makeWithFilter(GrContext* grContext,
                                         const SkImageFilter* filter, const SkIRect& subset,
                                         const SkIRect& clipBounds, SkIRect* outSubset,
                                         SkIPoint* offset) const {
      if (!filter || !outSubset || !offset || !this->bounds().contains(subset)) {
          return nullptr;
      }
      sk_sp<SkSpecialImage> srcSpecialImage =
  #if SK_SUPPORT_GPU
          SkSpecialImage::MakeFromImage(grContext, subset, sk_ref_sp(const_cast<SkImage*>(this)));
  #else
          SkSpecialImage::MakeFromImage(nullptr, subset, sk_ref_sp(const_cast<SkImage*>(this)));
  #endif
      if (!srcSpecialImage) {
          return nullptr;
      }
  
      sk_sp<SkImageFilterCache> cache(
          SkImageFilterCache::Create(SkImageFilterCache::kDefaultTransientSize));
  
      // The filters operate in the local space of the src image, where (0,0) corresponds to the
      // subset's top left corner. But the clip bounds and any crop rects on the filters are in the
      // original coordinate system, so configure the CTM to correct crop rects and explicitly adjust
      // the clip bounds (since it is assumed to already be in image space).
      SkImageFilter_Base::Context context(SkMatrix::MakeTrans(-subset.x(), -subset.y()),
                                          clipBounds.makeOffset(-subset.x(), -subset.y()),
                                          cache.get(), fInfo.colorType(), fInfo.colorSpace(),
                                          srcSpecialImage.get());
  
      sk_sp<SkSpecialImage> result = as_IFB(filter)->filterImage(context, offset);
      if (!result) {
          return nullptr;
      }
  
      // The output image and offset are relative to the subset rectangle, so the offset needs to
      // be shifted to put it in the correct spot with respect to the original coordinate system
      offset->fX += subset.x();
      offset->fY += subset.y();
  
      // Final clip against the exact clipBounds (the clip provided in the context gets adjusted
      // to account for pixel-moving filters so doesn't always exactly match when finished). The
      // clipBounds are translated into the clippedDstRect coordinate space, including the
      // result->subset() ensures that the result's image pixel origin does not affect results.
      SkIRect dstRect = result->subset();
      SkIRect clippedDstRect = dstRect;
      if (!clippedDstRect.intersect(clipBounds.makeOffset(result->subset().x() - offset->x(),
                                                          result->subset().y() - offset->y()))) {
          return nullptr;
      }
  
      // Adjust the geometric offset if the top-left corner moved as well
      offset->fX += (clippedDstRect.x() - dstRect.x());
      offset->fY += (clippedDstRect.y() - dstRect.y());
      *outSubset = clippedDstRect;
      return result->asImage();
  }
  
  bool SkImage::isLazyGenerated() const {
      return as_IB(this)->onIsLazyGenerated();
  }
  
  bool SkImage::isAlphaOnly() const { return SkColorTypeIsAlphaOnly(fInfo.colorType()); }
  
  sk_sp<SkImage> SkImage::makeColorSpace(sk_sp<SkColorSpace> target) const {
      if (!target) {
          return nullptr;
      }
  
      // No need to create a new image if:
      // (1) The color spaces are equal.
      // (2) The color type is kAlpha8.
      SkColorSpace* colorSpace = this->colorSpace();
      if (!colorSpace) {
          colorSpace = sk_srgb_singleton();
      }
      if (SkColorSpace::Equals(colorSpace, target.get()) || this->isAlphaOnly()) {
          return sk_ref_sp(const_cast<SkImage*>(this));
      }
  
      // CONTEXT TODO: propagate the context parameter to the top-level API
  #if SK_SUPPORT_GPU
      return as_IB(this)->onMakeColorTypeAndColorSpace(as_IB(this)->context(),
  #else
      return as_IB(this)->onMakeColorTypeAndColorSpace(nullptr,
  #endif
                                                       this->colorType(), std::move(target));
  }
  
  sk_sp<SkImage> SkImage::makeColorTypeAndColorSpace(SkColorType targetColorType,
                                                     sk_sp<SkColorSpace> targetColorSpace) const {
      if (kUnknown_SkColorType == targetColorType || !targetColorSpace) {
          return nullptr;
      }
  
      SkColorType colorType = this->colorType();
      SkColorSpace* colorSpace = this->colorSpace();
      if (!colorSpace) {
          colorSpace = sk_srgb_singleton();
      }
      if (colorType == targetColorType &&
          (SkColorSpace::Equals(colorSpace, targetColorSpace.get()) || this->isAlphaOnly())) {
          return sk_ref_sp(const_cast<SkImage*>(this));
      }
  
      // CONTEXT TODO: propagate the context parameter to the top-level API
  #if SK_SUPPORT_GPU
      return as_IB(this)->onMakeColorTypeAndColorSpace(as_IB(this)->context(),
  #else
      return as_IB(this)->onMakeColorTypeAndColorSpace(nullptr,
  #endif
                                                       targetColorType, std::move(targetColorSpace));
  }
  
  sk_sp<SkImage> SkImage::reinterpretColorSpace(sk_sp<SkColorSpace> target) const {
      if (!target) {
          return nullptr;
      }
  
      // No need to create a new image if:
      // (1) The color spaces are equal.
      // (2) The color type is kAlpha8.
      SkColorSpace* colorSpace = this->colorSpace();
      if (!colorSpace) {
          colorSpace = sk_srgb_singleton();
      }
      if (SkColorSpace::Equals(colorSpace, target.get()) || this->isAlphaOnly()) {
          return sk_ref_sp(const_cast<SkImage*>(this));
      }
  
      return as_IB(this)->onReinterpretColorSpace(std::move(target));
  }
  
  sk_sp<SkImage> SkImage::makeNonTextureImage() const {
      if (!this->isTextureBacked()) {
          return sk_ref_sp(const_cast<SkImage*>(this));
      }
      return this->makeRasterImage();
  }
  
  sk_sp<SkImage> SkImage::makeRasterImage() const {
      SkPixmap pm;
      if (this->peekPixels(&pm)) {
          return sk_ref_sp(const_cast<SkImage*>(this));
      }
  
      const size_t rowBytes = fInfo.minRowBytes();
      size_t size = fInfo.computeByteSize(rowBytes);
      if (SkImageInfo::ByteSizeOverflowed(size)) {
          return nullptr;
      }
  
      sk_sp<SkData> data = SkData::MakeUninitialized(size);
      pm = {fInfo.makeColorSpace(nullptr), data->writable_data(), fInfo.minRowBytes()};
      if (!this->readPixels(pm, 0, 0)) {
          return nullptr;
      }
  
      return SkImage::MakeRasterData(fInfo, std::move(data), rowBytes);
  }
  
  //////////////////////////////////////////////////////////////////////////////////////
  
  #if !SK_SUPPORT_GPU
  
  sk_sp<SkImage> SkImage::DecodeToTexture(GrContext*, const void*, size_t, const SkIRect*) {
      return nullptr;
  }
  
  sk_sp<SkImage> SkImage::MakeFromTexture(GrContext* ctx,
                                          const GrBackendTexture& tex, GrSurfaceOrigin origin,
                                          SkColorType ct, SkAlphaType at, sk_sp<SkColorSpace> cs,
                                          TextureReleaseProc releaseP, ReleaseContext releaseC) {
      return nullptr;
  }
  
  bool SkImage::MakeBackendTextureFromSkImage(GrContext*,
                                              sk_sp<SkImage>,
                                              GrBackendTexture*,
                                              BackendTextureReleaseProc*) {
      return false;
  }
  
  sk_sp<SkImage> SkImage::MakeFromAdoptedTexture(GrContext* ctx,
                                                 const GrBackendTexture& tex, GrSurfaceOrigin origin,
                                                 SkColorType ct, SkAlphaType at,
                                                 sk_sp<SkColorSpace> cs) {
      return nullptr;
  }
  
  sk_sp<SkImage> SkImage::MakeFromYUVATexturesCopy(GrContext* context,
                                                   SkYUVColorSpace yuvColorSpace,
                                                   const GrBackendTexture yuvaTextures[],
                                                   const SkYUVAIndex yuvaIndices[4],
                                                   SkISize imageSize,
                                                   GrSurfaceOrigin imageOrigin,
                                                   sk_sp<SkColorSpace> imageColorSpace) {
      return nullptr;
  }
  
  sk_sp<SkImage> SkImage::MakeFromYUVATexturesCopyWithExternalBackend(
          GrContext* context,
          SkYUVColorSpace yuvColorSpace,
          const GrBackendTexture yuvaTextures[],
          const SkYUVAIndex yuvaIndices[4],
          SkISize imageSize,
          GrSurfaceOrigin imageOrigin,
          const GrBackendTexture& backendTexture,
          sk_sp<SkColorSpace> imageColorSpace) {
      return nullptr;
  }
  
  sk_sp<SkImage> SkImage::MakeFromYUVTexturesCopy(GrContext* ctx, SkYUVColorSpace space,
                                                  const GrBackendTexture[3],
                                                  GrSurfaceOrigin origin,
                                                  sk_sp<SkColorSpace> imageColorSpace) {
      return nullptr;
  }
  
  sk_sp<SkImage> SkImage::MakeFromYUVTexturesCopyWithExternalBackend(
          GrContext* context, SkYUVColorSpace yuvColorSpace, const GrBackendTexture yuvTextures[3],
          GrSurfaceOrigin surfaceOrigin, const GrBackendTexture& backendTexture,
          sk_sp<SkColorSpace> colorSpace) {
      return nullptr;
  }
  
  sk_sp<SkImage> SkImage::MakeFromNV12TexturesCopy(GrContext* ctx, SkYUVColorSpace space,
                                                  const GrBackendTexture[2],
                                                  GrSurfaceOrigin origin,
                                                  sk_sp<SkColorSpace> imageColorSpace) {
      return nullptr;
  }
  
  sk_sp<SkImage> SkImage::makeTextureImage(GrContext*, GrMipMapped mipMapped) const {
      return nullptr;
  }
  
  sk_sp<SkImage> MakeFromNV12TexturesCopyWithExternalBackend(GrContext* context,
                                                             SkYUVColorSpace yuvColorSpace,
                                                             const GrBackendTexture nv12Textures[2],
                                                             GrSurfaceOrigin surfaceOrigin,
                                                             const GrBackendTexture& backendTexture,
                                                             sk_sp<SkColorSpace> colorSpace) {
      return nullptr;
  }
  
  #endif
  
  ///////////////////////////////////////////////////////////////////////////////////////////////////
  
  bool SkImage_pinAsTexture(const SkImage* image, GrContext* ctx) {
      SkASSERT(image);
      SkASSERT(ctx);
      return as_IB(image)->onPinAsTexture(ctx);
  }
  
  void SkImage_unpinAsTexture(const SkImage* image, GrContext* ctx) {
      SkASSERT(image);
      SkASSERT(ctx);
      as_IB(image)->onUnpinAsTexture(ctx);
  }
  
  SkIRect SkImage_getSubset(const SkImage* image) {
      SkASSERT(image);
      return as_IB(image)->onGetSubset();
  }
  