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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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 "base/command_line.h"
#include "base/logging.h"
#include "skia/ext/image_operations.h"
#include "ui/gfx/canvas.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/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_util.h"
namespace gfx {
namespace {
gfx::Size DIPToPixelSize(gfx::Size dip_size, float scale) {
return ToCeiledSize(ScaleSize(dip_size, scale));
}
gfx::Rect DIPToPixelBounds(gfx::Rect dip_bounds, float scale) {
return gfx::Rect(ToFlooredPoint(ScalePoint(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(SK_ColorRED);
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() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
ImageSkiaRep first_rep = first_.GetRepresentation(scale);
ImageSkiaRep second_rep = second_.GetRepresentation(scale);
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_;
DISALLOW_COPY_AND_ASSIGN(BinaryImageSource);
};
class BlendingImageSource : public BinaryImageSource {
public:
BlendingImageSource(const ImageSkia& first,
const ImageSkia& second,
double alpha)
: BinaryImageSource(first, second, "BlendingImageSource"),
alpha_(alpha) {
}
~BlendingImageSource() override {}
// BinaryImageSource overrides:
ImageSkiaRep CreateImageSkiaRep(
const ImageSkiaRep& first_rep,
const ImageSkiaRep& second_rep) const override {
SkBitmap blended = SkBitmapOperations::CreateBlendedBitmap(
first_rep.sk_bitmap(), second_rep.sk_bitmap(), alpha_);
return ImageSkiaRep(blended, first_rep.scale());
}
private:
double alpha_;
DISALLOW_COPY_AND_ASSIGN(BlendingImageSource);
};
class SuperimposedImageSource : public gfx::CanvasImageSource {
public:
SuperimposedImageSource(const ImageSkia& first,
const ImageSkia& second)
: gfx::CanvasImageSource(first.size(), false /* is opaque */),
first_(first),
second_(second) {
}
~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_;
DISALLOW_COPY_AND_ASSIGN(SuperimposedImageSource);
};
class TransparentImageSource : public gfx::ImageSkiaSource {
public:
TransparentImageSource(const ImageSkia& image, double alpha)
: image_(image),
alpha_(alpha) {
}
~TransparentImageSource() override {}
private:
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
ImageSkiaRep image_rep = image_.GetRepresentation(scale);
SkBitmap alpha;
alpha.allocN32Pixels(image_rep.pixel_width(),
image_rep.pixel_height());
alpha.eraseColor(SkColorSetARGB(alpha_ * 255, 0, 0, 0));
return ImageSkiaRep(
SkBitmapOperations::CreateMaskedBitmap(image_rep.sk_bitmap(), alpha),
image_rep.scale());
}
ImageSkia image_;
double alpha_;
DISALLOW_COPY_AND_ASSIGN(TransparentImageSource);
};
class MaskedImageSource : public BinaryImageSource {
public:
MaskedImageSource(const ImageSkia& rgb, const ImageSkia& alpha)
: BinaryImageSource(rgb, alpha, "MaskedImageSource") {
}
~MaskedImageSource() override {}
// BinaryImageSource overrides:
ImageSkiaRep CreateImageSkiaRep(
const ImageSkiaRep& first_rep,
const ImageSkiaRep& second_rep) const override {
return ImageSkiaRep(SkBitmapOperations::CreateMaskedBitmap(
first_rep.sk_bitmap(), second_rep.sk_bitmap()),
first_rep.scale());
}
private:
DISALLOW_COPY_AND_ASSIGN(MaskedImageSource);
};
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() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
ImageSkiaRep source_rep = source_.GetRepresentation(scale);
gfx::Rect bounds = DIPToPixelBounds(gfx::Rect(src_x_, src_y_, dst_w_,
dst_h_), source_rep.scale());
return ImageSkiaRep(
SkBitmapOperations::CreateTiledBitmap(
source_rep.sk_bitmap(),
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_;
DISALLOW_COPY_AND_ASSIGN(TiledImageSource);
};
class HSLImageSource : public gfx::ImageSkiaSource {
public:
HSLImageSource(const ImageSkia& image,
const color_utils::HSL& hsl_shift)
: image_(image),
hsl_shift_(hsl_shift) {
}
~HSLImageSource() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
ImageSkiaRep image_rep = image_.GetRepresentation(scale);
return gfx::ImageSkiaRep(
SkBitmapOperations::CreateHSLShiftedBitmap(image_rep.sk_bitmap(),
hsl_shift_), image_rep.scale());
}
private:
const gfx::ImageSkia image_;
const color_utils::HSL hsl_shift_;
DISALLOW_COPY_AND_ASSIGN(HSLImageSource);
};
// ImageSkiaSource which uses SkBitmapOperations::CreateButtonBackground
// to generate image reps for the target image. The image and mask can be
// diferent 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() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
ImageSkiaRep image_rep = image_.GetRepresentation(scale);
ImageSkiaRep mask_rep = mask_.GetRepresentation(scale);
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.sk_bitmap(), mask_rep.sk_bitmap()),
image_rep.scale());
}
private:
const SkColor color_;
const ImageSkia image_;
const ImageSkia mask_;
DISALLOW_COPY_AND_ASSIGN(ButtonImageSource);
};
// 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() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
ImageSkiaRep image_rep = image_.GetRepresentation(scale);
SkIRect subset_bounds_in_pixel = RectToSkIRect(
DIPToPixelBounds(subset_bounds_, image_rep.scale()));
SkBitmap dst;
bool success = image_rep.sk_bitmap().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_;
DISALLOW_COPY_AND_ASSIGN(ExtractSubsetImageSource);
};
// 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() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
const ImageSkiaRep& image_rep = source_.GetRepresentation(scale);
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.sk_bitmap(),
resize_method_,
target_pixel_size.width(),
target_pixel_size.height());
return ImageSkiaRep(resized, scale);
}
private:
const ImageSkia source_;
skia::ImageOperations::ResizeMethod resize_method_;
const Size target_dip_size_;
DISALLOW_COPY_AND_ASSIGN(ResizeSource);
};
// 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),
shaodws_in_dip_(shadows_in_dip) {
}
~DropShadowSource() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
const ImageSkiaRep& image_rep = source_.GetRepresentation(scale);
ShadowValues shadows_in_pixel;
for (size_t i = 0; i < shaodws_in_dip_.size(); ++i)
shadows_in_pixel.push_back(shaodws_in_dip_[i].Scale(scale));
const SkBitmap shadow_bitmap = SkBitmapOperations::CreateDropShadow(
image_rep.sk_bitmap(),
shadows_in_pixel);
return ImageSkiaRep(shadow_bitmap, image_rep.scale());
}
private:
const ImageSkia source_;
const ShadowValues shaodws_in_dip_;
DISALLOW_COPY_AND_ASSIGN(DropShadowSource);
};
// 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() override {}
// gfx::ImageSkiaSource overrides:
ImageSkiaRep GetImageForScale(float scale) override {
const ImageSkiaRep& image_rep = source_.GetRepresentation(scale);
const SkBitmap rotated_bitmap =
SkBitmapOperations::Rotate(image_rep.sk_bitmap(), rotation_);
return ImageSkiaRep(rotated_bitmap, image_rep.scale());
}
private:
const ImageSkia source_;
const SkBitmapOperations::RotationAmount rotation_;
DISALLOW_COPY_AND_ASSIGN(RotatedSource);
};
} // namespace
// static
ImageSkia ImageSkiaOperations::CreateBlendedImage(const ImageSkia& first,
const ImageSkia& second,
double alpha) {
if (first.isNull() || second.isNull())
return ImageSkia();
return ImageSkia(new 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(new SuperimposedImageSource(first, second), first.size());
}
// static
ImageSkia ImageSkiaOperations::CreateTransparentImage(const ImageSkia& image,
double alpha) {
if (image.isNull())
return ImageSkia();
return ImageSkia(new TransparentImageSource(image, alpha), image.size());
}
// static
ImageSkia ImageSkiaOperations::CreateMaskedImage(const ImageSkia& rgb,
const ImageSkia& alpha) {
if (rgb.isNull() || alpha.isNull())
return ImageSkia();
return ImageSkia(new 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(new 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(new 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(new 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();
}
return ImageSkia(new 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();
return ImageSkia(new 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(new DropShadowSource(source, shadows), shadow_image_size);
}
// static
ImageSkia ImageSkiaOperations::CreateRotatedImage(
const ImageSkia& source,
SkBitmapOperations::RotationAmount rotation) {
if (source.isNull())
return ImageSkia();
return ImageSkia(new RotatedSource(source, rotation),
SkBitmapOperations::ROTATION_180_CW == rotation ?
source.size() :
gfx::Size(source.height(), source.width()));
}
} // namespace gfx
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