/*
 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_IMAGE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_IMAGE_H_

#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/notreached.h"
#include "third_party/blink/public/mojom/webpreferences/web_preferences.mojom-blink-forward.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context_types.h"
#include "third_party/blink/renderer/platform/graphics/image_observer.h"
#include "third_party/blink/renderer/platform/graphics/image_orientation.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_image.h"
#include "third_party/blink/renderer/platform/heap/persistent.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/shared_buffer.h"
#include "third_party/blink/renderer/platform/wtf/thread_safe_ref_counted.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "ui/base/resource/resource_scale_factor.h"
#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size_f.h"

class SkMatrix;

namespace cc {
class PaintCanvas;
class PaintFlags;
class ImageDecodeCache;
}  // namespace cc

namespace blink {

class GraphicsContext;
class Image;
class WebGraphicsContext3DProvider;
class WebGraphicsContext3DProviderWrapper;
class DarkModeImageCache;

struct ImageTilingInfo;
struct ImageDrawOptions;

class PLATFORM_EXPORT Image : public ThreadSafeRefCounted<Image> {
  friend class GeneratedImage;
  friend class CrossfadeGeneratedImage;
  friend class GradientGeneratedImage;
  friend class GraphicsContext;

 public:
  Image(const Image&) = delete;
  Image& operator=(const Image&) = delete;
  virtual ~Image();

  static cc::ImageDecodeCache& SharedCCDecodeCache(SkColorType);

  static scoped_refptr<Image> LoadPlatformResource(
      int resource_id,
      ui::ResourceScaleFactor scale_factor = ui::k100Percent);

  // Resize and reorient the specified PaintImage. The resulting image will have
  // color type kN32_SkColorType. The resulting image will have the same color
  // space as the input PaintImage, unless a non-nullptr SkColorSpace is
  // specified, in which case the resulting image will have the specified color
  // space.
  static PaintImage ResizeAndOrientImage(
      const PaintImage&,
      ImageOrientation,
      gfx::Vector2dF image_scale = gfx::Vector2dF(1, 1),
      float opacity = 1.0,
      InterpolationQuality = kInterpolationNone);
  static PaintImage ResizeAndOrientImage(const PaintImage&,
                                         ImageOrientation,
                                         gfx::Vector2dF image_scale,
                                         float opacity,
                                         InterpolationQuality,
                                         sk_sp<SkColorSpace> color_space);

  virtual bool IsSVGImage() const { return false; }
  virtual bool IsBitmapImage() const { return false; }
  virtual bool IsStaticBitmapImage() const { return false; }

  virtual bool IsOpaque() = 0;

  virtual bool FirstFrameIsComplete() { return false; }
  virtual bool IsLazyDecoded() { return false; }
  virtual size_t FrameCount() { return 0; }
  virtual bool IsTextureBacked() const { return false; }

  // Derived classes should override this if they can assure that the image
  // contains only resources from its own security origin.
  virtual bool HasSingleSecurityOrigin() const { return false; }

  static Image* NullImage();
  bool IsNull() const { return this == NullImage(); }

  virtual bool HasIntrinsicSize() const { return true; }

  struct SizeConfig {
    // Apply density correction.
    bool apply_density = false;

    // Apply preferred orientation.
    bool apply_orientation = false;
  };

  // Size of the Image optionally modified per the provided SizeConfig.
  virtual gfx::Size SizeWithConfig(SizeConfig) const = 0;
  virtual gfx::SizeF SizeWithConfigAsFloat(SizeConfig config) const {
    return gfx::SizeF(SizeWithConfig(config));
  }

  // Size of the Image.
  gfx::Size Size() const { return SizeWithConfig({}); }

  // Size of the Image with density correction applied.
  gfx::Size DensityCorrectedSize() const {
    SizeConfig config;
    config.apply_density = true;
    return SizeWithConfig(config);
  }

  // Size of the Image with density correction and orientation applied
  // regardless of any settings or style affecting orientation.
  gfx::Size PreferredDisplaySize() const {
    SizeConfig config;
    config.apply_density = true;
    config.apply_orientation = true;
    return SizeWithConfig(config);
  }

  // Size of the Image with density correction applied. If the argument is
  // kRespectImageOrientation orientation is applied as well.
  gfx::Size Size(RespectImageOrientationEnum respect_orientation) const {
    SizeConfig config;
    config.apply_density = true;
    config.apply_orientation = respect_orientation == kRespectImageOrientation;
    return SizeWithConfig(config);
  }

  // Same as Size(RespectImageOrientationEnum) above, but returns a floating
  // point representation of the size. For subclasses of Image that can have a
  // fractional size this will return the unrounded size.
  gfx::SizeF SizeAsFloat(
      RespectImageOrientationEnum respect_orientation) const {
    SizeConfig config;
    config.apply_density = true;
    config.apply_orientation = respect_orientation == kRespectImageOrientation;
    return SizeWithConfigAsFloat(config);
  }

  gfx::Rect Rect() const { return gfx::Rect(Size()); }
  int width() const { return Size().width(); }
  int height() const { return Size().height(); }

  virtual bool GetHotSpot(gfx::Point&) const { return false; }

  enum SizeAvailability : uint8_t {
    kSizeUnavailable,
    kSizeAvailableAndLoadingAsynchronously,
    kSizeAvailable,
  };

  // If SetData() returns |kSizeAvailableAndLoadingAsynchronously|:
  //   Image loading is continuing asynchronously
  //   (only when |this| is SVGImage and |all_data_received| is true), and
  //   ImageResourceObserver::AsyncLoadCompleted() is called when finished.
  // Otherwise:
  //   Image loading is completed synchronously.
  //   ImageResourceObserver::AsyncLoadCompleted() is not called.
  virtual SizeAvailability SetData(scoped_refptr<SharedBuffer> data,
                                   bool all_data_received);
  virtual SizeAvailability DataChanged(bool /*all_data_received*/) {
    return kSizeUnavailable;
  }

  // Returns null string if unknown.
  virtual String FilenameExtension() const;

  // Returns WTF::g_null_atom if unknown.
  virtual const AtomicString& MimeType() const;

  virtual void DestroyDecodedData() = 0;

  // In some overrides, |Data()| can be somewhat expensive (e.g. in BitmapImage,
  // we don't use a SharedBuffer to store the image data, so |Data()| involves a
  // copy). |HasData()| and |DataSize()| should be preferred in cases where the
  // data itself is not needed.
  //
  // If a subclass overrides |Data|, it must override |HasData| and |DataSize|
  // as well.
  virtual scoped_refptr<SharedBuffer> Data() { return encoded_image_data_; }
  // Returns true iff the encoded image data is available.
  virtual bool HasData() const { return encoded_image_data_ != nullptr; }
  // Returns the size of the encoded image data, in bytes. Should only be called
  // if |HasData()| is true.
  virtual size_t DataSize() const {
    DCHECK(encoded_image_data_);
    return encoded_image_data_->size();
  }

  // Animation begins whenever someone draws the image, so startAnimation() is
  // not normally called. It will automatically pause once all observers no
  // longer want to render the image anywhere.
  virtual void StartAnimation() {}
  virtual void ResetAnimation() {}

  // True if this image can potentially animate.
  virtual bool MaybeAnimated() { return false; }

  // Set animationPolicy
  virtual void SetAnimationPolicy(mojom::blink::ImageAnimationPolicy) {}
  virtual mojom::blink::ImageAnimationPolicy AnimationPolicy();

  // Advances an animated image. For BitmapImage (e.g., animated gifs) this
  // will advance to the next frame. For SVGImage, this will trigger an
  // animation update for CSS and advance the SMIL timeline by one frame.
  virtual void AdvanceAnimationForTesting() {}

  // Typically the ImageResourceContent that owns us.
  ImageObserver* GetImageObserver() const {
    return image_observer_disabled_ ? nullptr : image_observer_;
  }
  void ClearImageObserver() { image_observer_ = nullptr; }
  // To avoid interleaved accesses to |m_imageObserverDisabled|, do not call
  // setImageObserverDisabled() other than from ImageObserverDisabler.
  void SetImageObserverDisabled(bool disabled) {
    image_observer_disabled_ = disabled;
  }

  virtual scoped_refptr<Image> ImageForDefaultFrame();

  enum ImageDecodingMode {
    // No preference specified.
    kUnspecifiedDecode,
    // Prefer to display the image synchronously with the rest of the content
    // updates.
    kSyncDecode,
    // Prefer to display the image asynchronously with the rest of the content
    // updates.
    kAsyncDecode
  };

  static PaintImage::DecodingMode ToPaintImageDecodingMode(
      ImageDecodingMode mode) {
    switch (mode) {
      case kUnspecifiedDecode:
        return PaintImage::DecodingMode::kUnspecified;
      case kSyncDecode:
        return PaintImage::DecodingMode::kSync;
      case kAsyncDecode:
        return PaintImage::DecodingMode::kAsync;
    }

    NOTREACHED();
  }

  virtual PaintImage PaintImageForCurrentFrame() = 0;

  // Most image types have the default orientation. Only bitmap derived image
  // types need to override this method.
  virtual ImageOrientation Orientation() const {
    return ImageOrientationEnum::kDefault;
  }
  bool HasDefaultOrientation() const {
    return Orientation() == ImageOrientationEnum::kDefault;
  }

  // Correct the src rect (rotate and maybe translate it) to account for a
  // non-default image orientation. The image must have non-default orientation
  // to call this method. The image_size is the oriented size of the image (i.e.
  // after orientation has been applied). src_rect may be a subset of the image,
  // also oriented.
  gfx::RectF CorrectSrcRectForImageOrientation(gfx::SizeF image_size,
                                               gfx::RectF src_rect) const;

  enum ImageClampingMode {
    kClampImageToSourceRect,
    kDoNotClampImageToSourceRect
  };

  static SkCanvas::SrcRectConstraint ToSkiaRectConstraint(
      Image::ImageClampingMode clamp_mode) {
    return clamp_mode == Image::kClampImageToSourceRect
               ? SkCanvas::kStrict_SrcRectConstraint
               : SkCanvas::kFast_SrcRectConstraint;
  }

  virtual void Draw(cc::PaintCanvas*,
                    const cc::PaintFlags&,
                    const gfx::RectF& dst_rect,
                    const gfx::RectF& src_rect,
                    const ImageDrawOptions& draw_options) = 0;

  // Apply this Image as a shader to the passed PaintFlags. This is currently
  // only used by GraphicsContext::DrawImageRRect() and to match the semantics
  // of that function the shader should use a clamping tile mode if possible.
  virtual bool ApplyShader(cc::PaintFlags&,
                           const SkMatrix& local_matrix,
                           const gfx::RectF& src_rect,
                           const ImageDrawOptions& draw_options);

  // Use ContextProvider() for immediate use only, use
  // ContextProviderWrapper() to obtain a retainable reference. Note:
  // Implemented only in sub-classes that use the GPU.
  virtual WebGraphicsContext3DProvider* ContextProvider() const {
    return nullptr;
  }
  virtual base::WeakPtr<WebGraphicsContext3DProviderWrapper>
  ContextProviderWrapper() const {
    return nullptr;
  }

  PaintImage::Id paint_image_id() const { return stable_image_id_; }

  // Returns an SkBitmap that is a copy of the image's current frame.
  SkBitmap AsSkBitmapForCurrentFrame(RespectImageOrientationEnum);

  DarkModeImageCache* GetDarkModeImageCache();

 protected:
  Image(ImageObserver* = nullptr, bool is_multipart = false);

  virtual void DrawPattern(GraphicsContext&,
                           const cc::PaintFlags&,
                           const gfx::RectF& dest_rect,
                           const ImageTilingInfo& tiling_info,
                           const ImageDrawOptions& draw_options);

  // Creates and initializes a PaintImageBuilder with the metadata flags for the
  // PaintImage.
  PaintImageBuilder CreatePaintImageBuilder();

  // Whether or not size is available yet.
  virtual bool IsSizeAvailable() { return true; }

 private:
  bool image_observer_disabled_;
  scoped_refptr<SharedBuffer> encoded_image_data_;
  // TODO(Oilpan): consider having Image on the Oilpan heap and
  // turn this into a Member<>.
  //
  // The observer (an ImageResourceContent) is responsible for clearing
  // itself out when it switches to another Image.
  // When the ImageResourceContent is garbage collected while Image is still
  // alive, |image_observer_| is cleared by WeakPersistent mechanism.
  WeakPersistent<ImageObserver> image_observer_;
  PaintImage::Id stable_image_id_;
  const bool is_multipart_;
  std::unique_ptr<DarkModeImageCache> dark_mode_image_cache_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_IMAGE_H_