// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/gfx/image/image_skia_operations.h"

#include <stddef.h>

#include <memory>

#include "base/command_line.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/numerics/safe_conversions.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkClipOp.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/color_palette.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/geometry/skia_conversions.h"
#include "ui/gfx/image/canvas_image_source.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/gfx/image/image_skia_source.h"
#include "ui/gfx/skbitmap_operations.h"
#include "ui/gfx/skia_paint_util.h"

namespace gfx {
namespace {

gfx::Size DIPToPixelSize(gfx::Size dip_size, float scale) {
  return ScaleToCeiledSize(dip_size, scale);
}

gfx::Rect DIPToPixelBounds(gfx::Rect dip_bounds, float scale) {
  return gfx::Rect(ScaleToFlooredPoint(dip_bounds.origin(), scale),
                   DIPToPixelSize(dip_bounds.size(), scale));
}

// Returns an image rep for the ImageSkiaSource to return to visually indicate
// an error.
ImageSkiaRep GetErrorImageRep(float scale, const gfx::Size& pixel_size) {
  SkBitmap bitmap;
  bitmap.allocN32Pixels(pixel_size.width(), pixel_size.height());
  bitmap.eraseColor(kPlaceholderColor);
  return gfx::ImageSkiaRep(bitmap, scale);
}

// A base image source class that creates an image from two source images.
// This class guarantees that two ImageSkiaReps have have the same pixel size.
class BinaryImageSource : public gfx::ImageSkiaSource {
 protected:
  BinaryImageSource(const ImageSkia& first,
                    const ImageSkia& second,
                    const char* source_name)
      : first_(first), second_(second), source_name_(source_name) {}

  BinaryImageSource(const BinaryImageSource&) = delete;
  BinaryImageSource& operator=(const BinaryImageSource&) = delete;

  ~BinaryImageSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    ImageSkiaRep first_rep = first_.GetRepresentation(scale);
    if (first_rep.is_null())
      return first_rep;
    ImageSkiaRep second_rep = second_.GetRepresentation(scale);
    if (second_rep.is_null())
      return second_rep;

    if (first_rep.pixel_size() != second_rep.pixel_size()) {
      DCHECK_NE(first_rep.scale(), second_rep.scale());
      if (first_rep.scale() == second_rep.scale()) {
        LOG(ERROR) << "ImageSkiaRep size mismatch in " << source_name_;
        return GetErrorImageRep(first_rep.scale(), first_rep.pixel_size());
      }
      first_rep = first_.GetRepresentation(1.0f);
      second_rep = second_.GetRepresentation(1.0f);
      DCHECK_EQ(first_rep.pixel_width(), second_rep.pixel_width());
      DCHECK_EQ(first_rep.pixel_height(), second_rep.pixel_height());
      if (first_rep.pixel_size() != second_rep.pixel_size()) {
        LOG(ERROR) << "ImageSkiaRep size mismatch in " << source_name_;
        return GetErrorImageRep(first_rep.scale(), first_rep.pixel_size());
      }
    } else {
      DCHECK_EQ(first_rep.scale(), second_rep.scale());
    }
    return CreateImageSkiaRep(first_rep, second_rep);
  }

  // Creates a final image from two ImageSkiaReps. The pixel size of
  // the two images are guaranteed to be the same.
  virtual ImageSkiaRep CreateImageSkiaRep(
      const ImageSkiaRep& first_rep,
      const ImageSkiaRep& second_rep) const = 0;

 private:
  const ImageSkia first_;
  const ImageSkia second_;
  // The name of a class that implements the BinaryImageSource.
  // The subclass is responsible for managing the memory.
  const char* source_name_;
};

class BlendingImageSource : public BinaryImageSource {
 public:
  BlendingImageSource(const ImageSkia& first,
                      const ImageSkia& second,
                      double alpha)
      : BinaryImageSource(first, second, "BlendingImageSource"),
        alpha_(alpha) {}

  BlendingImageSource(const BlendingImageSource&) = delete;
  BlendingImageSource& operator=(const BlendingImageSource&) = delete;

  ~BlendingImageSource() override {}

  // BinaryImageSource overrides:
  ImageSkiaRep CreateImageSkiaRep(
      const ImageSkiaRep& first_rep,
      const ImageSkiaRep& second_rep) const override {
    SkBitmap blended = SkBitmapOperations::CreateBlendedBitmap(
        first_rep.GetBitmap(), second_rep.GetBitmap(), alpha_);
    return ImageSkiaRep(blended, first_rep.scale());
  }

 private:
  double alpha_;
};

class SuperimposedImageSource : public gfx::CanvasImageSource {
 public:
  SuperimposedImageSource(const ImageSkia& first, const ImageSkia& second)
      : gfx::CanvasImageSource(first.size()), first_(first), second_(second) {}

  SuperimposedImageSource(const SuperimposedImageSource&) = delete;
  SuperimposedImageSource& operator=(const SuperimposedImageSource&) = delete;

  ~SuperimposedImageSource() override {}

  // gfx::CanvasImageSource override.
  void Draw(Canvas* canvas) override {
    canvas->DrawImageInt(first_, 0, 0);
    canvas->DrawImageInt(second_, (first_.width() - second_.width()) / 2,
                         (first_.height() - second_.height()) / 2);
  }

 private:
  const ImageSkia first_;
  const ImageSkia second_;
};

class TransparentImageSource : public gfx::ImageSkiaSource {
 public:
  TransparentImageSource(const ImageSkia& image, double alpha)
      : image_(image), alpha_(alpha) {}

  TransparentImageSource(const TransparentImageSource&) = delete;
  TransparentImageSource& operator=(const TransparentImageSource&) = delete;

  ~TransparentImageSource() override {}

 private:
  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    ImageSkiaRep image_rep = image_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;

    SkBitmap alpha;
    alpha.allocN32Pixels(image_rep.pixel_width(), image_rep.pixel_height());
    alpha.eraseColor(SkColorSetA(SK_ColorBLACK, SK_AlphaOPAQUE * alpha_));
    return ImageSkiaRep(
        SkBitmapOperations::CreateMaskedBitmap(image_rep.GetBitmap(), alpha),
        image_rep.scale());
  }

  ImageSkia image_;
  double alpha_;
};

class MaskedImageSource : public BinaryImageSource {
 public:
  MaskedImageSource(const ImageSkia& rgb, const ImageSkia& alpha)
      : BinaryImageSource(rgb, alpha, "MaskedImageSource") {}

  MaskedImageSource(const MaskedImageSource&) = delete;
  MaskedImageSource& operator=(const MaskedImageSource&) = delete;

  ~MaskedImageSource() override {}

  // BinaryImageSource overrides:
  ImageSkiaRep CreateImageSkiaRep(
      const ImageSkiaRep& first_rep,
      const ImageSkiaRep& second_rep) const override {
    return ImageSkiaRep(SkBitmapOperations::CreateMaskedBitmap(
                            first_rep.GetBitmap(), second_rep.GetBitmap()),
                        first_rep.scale());
  }
};

class TiledImageSource : public gfx::ImageSkiaSource {
 public:
  TiledImageSource(const ImageSkia& source,
                   int src_x,
                   int src_y,
                   int dst_w,
                   int dst_h)
      : source_(source),
        src_x_(src_x),
        src_y_(src_y),
        dst_w_(dst_w),
        dst_h_(dst_h) {}

  TiledImageSource(const TiledImageSource&) = delete;
  TiledImageSource& operator=(const TiledImageSource&) = delete;

  ~TiledImageSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    ImageSkiaRep source_rep = source_.GetRepresentation(scale);
    if (source_rep.is_null())
      return source_rep;

    gfx::Rect bounds = DIPToPixelBounds(
        gfx::Rect(src_x_, src_y_, dst_w_, dst_h_), source_rep.scale());
    return ImageSkiaRep(SkBitmapOperations::CreateTiledBitmap(
                            source_rep.GetBitmap(), bounds.x(), bounds.y(),
                            bounds.width(), bounds.height()),
                        source_rep.scale());
  }

 private:
  const ImageSkia source_;
  const int src_x_;
  const int src_y_;
  const int dst_w_;
  const int dst_h_;
};

class HSLImageSource : public gfx::ImageSkiaSource {
 public:
  HSLImageSource(const ImageSkia& image, const color_utils::HSL& hsl_shift)
      : image_(image), hsl_shift_(hsl_shift) {}

  HSLImageSource(const HSLImageSource&) = delete;
  HSLImageSource& operator=(const HSLImageSource&) = delete;

  ~HSLImageSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    ImageSkiaRep image_rep = image_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;

    return gfx::ImageSkiaRep(SkBitmapOperations::CreateHSLShiftedBitmap(
                                 image_rep.GetBitmap(), hsl_shift_),
                             image_rep.scale());
  }

 private:
  const gfx::ImageSkia image_;
  const color_utils::HSL hsl_shift_;
};

// ImageSkiaSource which uses SkBitmapOperations::CreateButtonBackground
// to generate image reps for the target image.  The image and mask can be
// different sizes (crbug.com/171725).
class ButtonImageSource : public gfx::ImageSkiaSource {
 public:
  ButtonImageSource(SkColor color,
                    const ImageSkia& image,
                    const ImageSkia& mask)
      : color_(color), image_(image), mask_(mask) {}

  ButtonImageSource(const ButtonImageSource&) = delete;
  ButtonImageSource& operator=(const ButtonImageSource&) = delete;

  ~ButtonImageSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    ImageSkiaRep image_rep = image_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;
    ImageSkiaRep mask_rep = mask_.GetRepresentation(scale);
    if (mask_rep.is_null())
      return image_rep;

    if (image_rep.scale() != mask_rep.scale()) {
      image_rep = image_.GetRepresentation(1.0f);
      mask_rep = mask_.GetRepresentation(1.0f);
    }
    return gfx::ImageSkiaRep(
        SkBitmapOperations::CreateButtonBackground(
            color_, image_rep.GetBitmap(), mask_rep.GetBitmap()),
        image_rep.scale());
  }

 private:
  const SkColor color_;
  const ImageSkia image_;
  const ImageSkia mask_;
};

// ImageSkiaSource which uses SkBitmap::extractSubset to generate image reps
// for the target image.
class ExtractSubsetImageSource : public gfx::ImageSkiaSource {
 public:
  ExtractSubsetImageSource(const gfx::ImageSkia& image,
                           const gfx::Rect& subset_bounds)
      : image_(image), subset_bounds_(subset_bounds) {}

  ExtractSubsetImageSource(const ExtractSubsetImageSource&) = delete;
  ExtractSubsetImageSource& operator=(const ExtractSubsetImageSource&) = delete;

  ~ExtractSubsetImageSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    ImageSkiaRep image_rep = image_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;

    SkIRect subset_bounds_in_pixel =
        RectToSkIRect(DIPToPixelBounds(subset_bounds_, image_rep.scale()));
    SkBitmap dst;
    bool success =
        image_rep.GetBitmap().extractSubset(&dst, subset_bounds_in_pixel);
    DCHECK(success);
    return gfx::ImageSkiaRep(dst, image_rep.scale());
  }

 private:
  const gfx::ImageSkia image_;
  const gfx::Rect subset_bounds_;
};

// ResizeSource resizes relevant image reps in |source| to |target_dip_size|
// for requested scale factors.
class ResizeSource : public ImageSkiaSource {
 public:
  ResizeSource(const ImageSkia& source,
               skia::ImageOperations::ResizeMethod method,
               const Size& target_dip_size)
      : source_(source),
        resize_method_(method),
        target_dip_size_(target_dip_size) {}

  ResizeSource(const ResizeSource&) = delete;
  ResizeSource& operator=(const ResizeSource&) = delete;

  ~ResizeSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    const ImageSkiaRep& image_rep = source_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;
    if (image_rep.GetWidth() == target_dip_size_.width() &&
        image_rep.GetHeight() == target_dip_size_.height())
      return image_rep;

    const Size target_pixel_size = DIPToPixelSize(target_dip_size_, scale);
    const SkBitmap resized = skia::ImageOperations::Resize(
        image_rep.GetBitmap(), resize_method_, target_pixel_size.width(),
        target_pixel_size.height());
    if (resized.colorType() == kUnknown_SkColorType)
      return ImageSkiaRep();
    return ImageSkiaRep(resized, scale);
  }

 private:
  const ImageSkia source_;
  skia::ImageOperations::ResizeMethod resize_method_;
  const Size target_dip_size_;
};

// DropShadowSource generates image reps with drop shadow for image reps in
// |source| that represent requested scale factors.
class DropShadowSource : public ImageSkiaSource {
 public:
  DropShadowSource(const ImageSkia& source, const ShadowValues& shadows_in_dip)
      : source_(source), shadows_in_dip_(shadows_in_dip) {}

  DropShadowSource(const DropShadowSource&) = delete;
  DropShadowSource& operator=(const DropShadowSource&) = delete;

  ~DropShadowSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    const ImageSkiaRep& image_rep = source_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;

    ShadowValues shadows_in_pixel;
    for (size_t i = 0; i < shadows_in_dip_.size(); ++i)
      shadows_in_pixel.push_back(shadows_in_dip_[i].Scale(scale));

    const SkBitmap shadow_bitmap = SkBitmapOperations::CreateDropShadow(
        image_rep.GetBitmap(), shadows_in_pixel);
    return ImageSkiaRep(shadow_bitmap, image_rep.scale());
  }

 private:
  const ImageSkia source_;
  const ShadowValues shadows_in_dip_;
};

// An image source that is 1px wide, suitable for tiling horizontally.
class HorizontalShadowSource : public CanvasImageSource {
 public:
  HorizontalShadowSource(const std::vector<ShadowValue>& shadows,
                         bool fades_down)
      : CanvasImageSource(Size(1, GetHeightForShadows(shadows))),
        shadows_(shadows),
        fades_down_(fades_down) {}

  HorizontalShadowSource(const HorizontalShadowSource&) = delete;
  HorizontalShadowSource& operator=(const HorizontalShadowSource&) = delete;

  ~HorizontalShadowSource() override {}

  // CanvasImageSource overrides:
  void Draw(Canvas* canvas) override {
    cc::PaintFlags flags;
    flags.setLooper(CreateShadowDrawLooper(shadows_));
    canvas->DrawRect(RectF(0, fades_down_ ? -1 : size().height(), 1, 1), flags);
  }

 private:
  static int GetHeightForShadows(const std::vector<ShadowValue>& shadows) {
    int height = 0;
    for (const auto& shadow : shadows) {
      height =
          std::max(height, shadow.y() + base::ClampCeil(shadow.blur() / 2));
    }
    return height;
  }

  const std::vector<ShadowValue> shadows_;

  // The orientation of the shadow (true for shadows that emanate downwards).
  bool fades_down_;
};

// RotatedSource generates image reps that are rotations of those in
// |source| that represent requested scale factors.
class RotatedSource : public ImageSkiaSource {
 public:
  RotatedSource(const ImageSkia& source,
                SkBitmapOperations::RotationAmount rotation)
      : source_(source), rotation_(rotation) {}

  RotatedSource(const RotatedSource&) = delete;
  RotatedSource& operator=(const RotatedSource&) = delete;

  ~RotatedSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    const ImageSkiaRep& image_rep = source_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;

    const SkBitmap rotated_bitmap =
        SkBitmapOperations::Rotate(image_rep.GetBitmap(), rotation_);
    return ImageSkiaRep(rotated_bitmap, image_rep.scale());
  }

 private:
  const ImageSkia source_;
  const SkBitmapOperations::RotationAmount rotation_;
};

class IconWithBadgeSource : public gfx::CanvasImageSource {
 public:
  IconWithBadgeSource(const ImageSkia& icon, const ImageSkia& badge)
      : gfx::CanvasImageSource(icon.size()), icon_(icon), badge_(badge) {}

  IconWithBadgeSource(const IconWithBadgeSource&) = delete;
  IconWithBadgeSource& operator=(const IconWithBadgeSource&) = delete;

  ~IconWithBadgeSource() override {}

  // gfx::CanvasImageSource override.
  void Draw(Canvas* canvas) override {
    canvas->DrawImageInt(icon_, 0, 0);
    canvas->DrawImageInt(badge_, (icon_.width() - badge_.width()),
                         (icon_.height() - badge_.height()));
  }

 private:
  const ImageSkia icon_;
  const ImageSkia badge_;
};

// ImageSkiaSource which uses SkBitmapOperations::CreateColorMask
// to generate image reps for the target image.
class ColorMaskSource : public gfx::ImageSkiaSource {
 public:
  ColorMaskSource(const ImageSkia& image, SkColor color)
      : image_(image), color_(color) {}

  ColorMaskSource(const ColorMaskSource&) = delete;
  ColorMaskSource& operator=(const ColorMaskSource&) = delete;

  ~ColorMaskSource() override {}

  // gfx::ImageSkiaSource overrides:
  ImageSkiaRep GetImageForScale(float scale) override {
    ImageSkiaRep image_rep = image_.GetRepresentation(scale);
    if (image_rep.is_null())
      return image_rep;

    return ImageSkiaRep(
        SkBitmapOperations::CreateColorMask(image_rep.GetBitmap(), color_),
        image_rep.scale());
  }

 private:
  const ImageSkia image_;
  const SkColor color_;
};

// Image source to create an image with a circle background.
class ImageWithCircleBackgroundSource : public gfx::CanvasImageSource {
 public:
  ImageWithCircleBackgroundSource(int radius,
                                  SkColor color,
                                  const gfx::ImageSkia& image)
      : gfx::CanvasImageSource(gfx::Size(radius * 2, radius * 2)),
        radius_(radius),
        color_(color),
        image_(image) {}

  ImageWithCircleBackgroundSource(const ImageWithCircleBackgroundSource&) =
      delete;
  ImageWithCircleBackgroundSource& operator=(
      const ImageWithCircleBackgroundSource&) = delete;

  ~ImageWithCircleBackgroundSource() override = default;

  // gfx::CanvasImageSource:
  void Draw(gfx::Canvas* canvas) override {
    cc::PaintFlags flags;
    flags.setAntiAlias(true);
    flags.setStyle(cc::PaintFlags::kFill_Style);
    flags.setColor(color_);
    canvas->DrawCircle(gfx::Point(radius_, radius_), radius_, flags);
    const int x = radius_ - image_.width() / 2;
    const int y = radius_ - image_.height() / 2;
    canvas->DrawImageInt(image_, x, y);
  }

 private:
  const int radius_;
  const SkColor color_;
  const gfx::ImageSkia image_;
};

// Image source to create an image with a rounded rect background.
class ImageWithRoundRectBackgroundSource : public gfx::CanvasImageSource {
 public:
  ImageWithRoundRectBackgroundSource(const SizeF& size,
                                     int radius,
                                     SkColor color,
                                     const gfx::ImageSkia& image)
      : gfx::CanvasImageSource(ToFlooredSize(size)),
        size_(size),
        radius_(radius),
        color_(color),
        image_(image) {}

  ImageWithRoundRectBackgroundSource(
      const ImageWithRoundRectBackgroundSource&) = delete;
  ImageWithRoundRectBackgroundSource& operator=(
      const ImageWithRoundRectBackgroundSource&) = delete;

  ~ImageWithRoundRectBackgroundSource() override = default;

  // gfx::CanvasImageSource:
  void Draw(gfx::Canvas* canvas) override {
    cc::PaintFlags flags;
    flags.setAntiAlias(true);
    flags.setStyle(cc::PaintFlags::kFill_Style);
    flags.setColor(color_);
    canvas->DrawRoundRect(RectF{size_}, radius_, flags);
    // Center the image.
    const int x = (size_.width() - image_.width()) / 2;
    const int y = (size_.height() - image_.height()) / 2;
    canvas->DrawImageInt(image_, x, y);
  }

 private:
  const SizeF size_;
  const int radius_;
  const SkColor color_;
  const gfx::ImageSkia image_;
};

// Image source to create an image with a roundrect clip path.
class ImageWithRoundRectClipSource : public gfx::CanvasImageSource {
 public:
  ImageWithRoundRectClipSource(int radius, const gfx::ImageSkia& image)
      : gfx::CanvasImageSource(image.size()), radius_(radius), image_(image) {}

  ImageWithRoundRectClipSource(const ImageWithRoundRectClipSource&) = delete;
  ImageWithRoundRectClipSource& operator=(const ImageWithRoundRectClipSource&) =
      delete;

  ~ImageWithRoundRectClipSource() override = default;

  // gfx::CanvasImageSource:
  void Draw(gfx::Canvas* canvas) override {
    canvas->ClipPath(
        SkPath().addRoundRect(gfx::RectToSkRect(gfx::Rect(image_.size())),
                              radius_, radius_),
        true);
    canvas->DrawImageInt(image_, 0, 0);
  }

 private:
  const int radius_;
  const gfx::ImageSkia image_;
};
}  // namespace

// static
ImageSkia ImageSkiaOperations::CreateBlendedImage(const ImageSkia& first,
                                                  const ImageSkia& second,
                                                  double alpha) {
  if (first.isNull() || second.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<BlendingImageSource>(first, second, alpha),
                   first.size());
}

// static
ImageSkia ImageSkiaOperations::CreateSuperimposedImage(
    const ImageSkia& first,
    const ImageSkia& second) {
  if (first.isNull() || second.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<SuperimposedImageSource>(first, second),
                   first.size());
}

// static
ImageSkia ImageSkiaOperations::CreateTransparentImage(const ImageSkia& image,
                                                      double alpha) {
  if (image.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<TransparentImageSource>(image, alpha),
                   image.size());
}

// static
ImageSkia ImageSkiaOperations::CreateMaskedImage(const ImageSkia& rgb,
                                                 const ImageSkia& alpha) {
  if (rgb.isNull() || alpha.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<MaskedImageSource>(rgb, alpha), rgb.size());
}

// static
ImageSkia ImageSkiaOperations::CreateTiledImage(const ImageSkia& source,
                                                int src_x,
                                                int src_y,
                                                int dst_w,
                                                int dst_h) {
  if (source.isNull())
    return ImageSkia();

  return ImageSkia(
      std::make_unique<TiledImageSource>(source, src_x, src_y, dst_w, dst_h),
      gfx::Size(dst_w, dst_h));
}

// static
ImageSkia ImageSkiaOperations::CreateHSLShiftedImage(
    const ImageSkia& image,
    const color_utils::HSL& hsl_shift) {
  if (image.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<HSLImageSource>(image, hsl_shift),
                   image.size());
}

// static
ImageSkia ImageSkiaOperations::CreateButtonBackground(SkColor color,
                                                      const ImageSkia& image,
                                                      const ImageSkia& mask) {
  if (image.isNull() || mask.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<ButtonImageSource>(color, image, mask),
                   mask.size());
}

// static
ImageSkia ImageSkiaOperations::ExtractSubset(const ImageSkia& image,
                                             const Rect& subset_bounds) {
  gfx::Rect clipped_bounds =
      gfx::IntersectRects(subset_bounds, gfx::Rect(image.size()));
  if (image.isNull() || clipped_bounds.IsEmpty())
    return ImageSkia();
  if (clipped_bounds == gfx::Rect(image.size()))
    return image;

  return ImageSkia(
      std::make_unique<ExtractSubsetImageSource>(image, clipped_bounds),
      clipped_bounds.size());
}

// static
ImageSkia ImageSkiaOperations::CreateResizedImage(
    const ImageSkia& source,
    skia::ImageOperations::ResizeMethod method,
    const Size& target_dip_size) {
  if (source.isNull())
    return ImageSkia();
  if (source.size() == target_dip_size)
    return source;

  return ImageSkia(
      std::make_unique<ResizeSource>(source, method, target_dip_size),
      target_dip_size);
}

// static
ImageSkia ImageSkiaOperations::CreateImageWithDropShadow(
    const ImageSkia& source,
    const ShadowValues& shadows) {
  if (source.isNull())
    return ImageSkia();

  const gfx::Insets shadow_padding = -gfx::ShadowValue::GetMargin(shadows);
  gfx::Size shadow_image_size = source.size();
  shadow_image_size.Enlarge(shadow_padding.width(), shadow_padding.height());
  return ImageSkia(std::make_unique<DropShadowSource>(source, shadows),
                   shadow_image_size);
}

// static
ImageSkia ImageSkiaOperations::CreateHorizontalShadow(
    const std::vector<ShadowValue>& shadows,
    bool fades_down) {
  auto* source = new HorizontalShadowSource(shadows, fades_down);
  return ImageSkia(base::WrapUnique(source), source->size());
}

// static
ImageSkia ImageSkiaOperations::CreateRotatedImage(
    const ImageSkia& source,
    SkBitmapOperations::RotationAmount rotation) {
  if (source.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<RotatedSource>(source, rotation),
                   SkBitmapOperations::ROTATION_180_CW == rotation
                       ? source.size()
                       : gfx::Size(source.height(), source.width()));
}

// static
ImageSkia ImageSkiaOperations::CreateIconWithBadge(const ImageSkia& icon,
                                                   const ImageSkia& badge) {
  if (icon.isNull())
    return ImageSkia();

  if (badge.isNull())
    return icon;

  return ImageSkia(std::make_unique<IconWithBadgeSource>(icon, badge),
                   icon.size());
}

// static
ImageSkia ImageSkiaOperations::CreateColorMask(const ImageSkia& image,
                                               SkColor color) {
  if (image.isNull())
    return ImageSkia();

  return ImageSkia(std::make_unique<ColorMaskSource>(image, color),
                   image.size());
}

ImageSkia ImageSkiaOperations::CreateImageWithCircleBackground(
    int radius,
    SkColor color,
    const ImageSkia& image) {
  DCHECK_GE(radius * 2, image.width());
  DCHECK_GE(radius * 2, image.height());
  return gfx::CanvasImageSource::MakeImageSkia<ImageWithCircleBackgroundSource>(
      radius, color, image);
}

ImageSkia ImageSkiaOperations::CreateImageWithRoundRectBackground(
    const SizeF& size,
    int radius,
    SkColor color,
    const ImageSkia& image) {
  DCHECK_GE(size.width(), image.width());
  DCHECK_GE(size.height(), image.height());
  return gfx::CanvasImageSource::MakeImageSkia<
      ImageWithRoundRectBackgroundSource>(size, radius, color, image);
}

ImageSkia ImageSkiaOperations::CreateImageWithRoundRectClip(
    int radius,
    const ImageSkia& image) {
  return gfx::CanvasImageSource::MakeImageSkia<ImageWithRoundRectClipSource>(
      radius, image);
}

ImageSkia ImageSkiaOperations::CreateCroppedCenteredRoundRectImage(
    const Size& size,
    int border_radius,
    const ImageSkia& image) {
  float scale = std::min(static_cast<float>(image.width()) / size.width(),
                         static_cast<float>(image.height()) / size.height());
  Size scaled_size = {base::ClampFloor(scale * size.width()),
                      base::ClampFloor(scale * size.height())};
  Rect bounds{{0, 0}, image.size()};
  bounds.ClampToCenteredSize(scaled_size);
  auto scaled_and_cropped_image = CreateTiledImage(
      image, bounds.x(), bounds.y(), bounds.width(), bounds.height());
  auto resized_image = CreateResizedImage(
      scaled_and_cropped_image, skia::ImageOperations::RESIZE_LANCZOS3, size);
  return CreateImageWithRoundRectClip(border_radius, resized_image);
}
}  // namespace gfx