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// 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_platform.h"
#include <stddef.h>
#import <UIKit/UIKit.h>
#include <cmath>
#include <limits>
#include "base/logging.h"
#include "ui/base/resource/resource_scale_factor.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image_internal.h"
#include "ui/gfx/image/image_png_rep.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/gfx/image/image_skia_util_ios.h"
namespace {
// Returns a 16x16 red UIImage to visually show when a UIImage cannot be
// created from PNG data. Logs error as well.
UIImage* CreateErrorUIImage(float scale) {
LOG(ERROR) << "Unable to decode PNG into UIImage.";
base::apple::ScopedCFTypeRef<CGColorSpaceRef> color_space(
CGColorSpaceCreateDeviceRGB());
base::apple::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
nullptr, // Allow CG to allocate memory.
16, // width
16, // height
8, // bitsPerComponent
0, // CG will calculate by default.
color_space.get(),
kCGImageAlphaPremultipliedFirst |
static_cast<CGImageAlphaInfo>(kCGBitmapByteOrder32Host)));
CGContextSetRGBFillColor(context.get(), 1.0, 0.0, 0.0, 1.0);
CGContextFillRect(context.get(), CGRectMake(0.0, 0.0, 16, 16));
base::apple::ScopedCFTypeRef<CGImageRef> cg_image(
CGBitmapContextCreateImage(context.get()));
return [UIImage imageWithCGImage:cg_image.get()
scale:scale
orientation:UIImageOrientationUp];
}
// Converts from ImagePNGRep to UIImage.
UIImage* CreateUIImageFromImagePNGRep(const gfx::ImagePNGRep& image_png_rep) {
float scale = image_png_rep.scale;
scoped_refptr<base::RefCountedMemory> png = image_png_rep.raw_data;
CHECK(png.get());
NSData* data = [NSData dataWithBytes:png->front() length:png->size()];
UIImage* image = [[UIImage alloc] initWithData:data scale:scale];
return image ? image : CreateErrorUIImage(scale);
}
} // namespace
namespace gfx {
namespace internal {
class ImageRepCocoaTouch final : public ImageRep {
public:
explicit ImageRepCocoaTouch(UIImage* image)
: ImageRep(Image::kImageRepCocoaTouch), image_(image) {
CHECK(image_);
}
ImageRepCocoaTouch(const ImageRepCocoaTouch&) = delete;
ImageRepCocoaTouch& operator=(const ImageRepCocoaTouch&) = delete;
~ImageRepCocoaTouch() override = default;
int Width() const override { return Size().width(); }
int Height() const override { return Size().height(); }
gfx::Size Size() const override {
int width = static_cast<int>(image_.size.width);
int height = static_cast<int>(image_.size.height);
return gfx::Size(width, height);
}
UIImage* image() const { return image_; }
private:
UIImage* __strong image_;
};
const ImageRepCocoaTouch* ImageRep::AsImageRepCocoaTouch() const {
CHECK_EQ(type_, Image::kImageRepCocoaTouch);
return reinterpret_cast<const ImageRepCocoaTouch*>(this);
}
ImageRepCocoaTouch* ImageRep::AsImageRepCocoaTouch() {
return const_cast<ImageRepCocoaTouch*>(
static_cast<const ImageRep*>(this)->AsImageRepCocoaTouch());
}
scoped_refptr<base::RefCountedMemory> Get1xPNGBytesFromUIImage(
UIImage* uiimage) {
DCHECK(uiimage);
NSData* data = UIImagePNGRepresentation(uiimage);
if (data.length == 0) {
return nullptr;
}
scoped_refptr<base::RefCountedBytes> png_bytes(
new base::RefCountedBytes());
png_bytes->as_vector().resize(data.length);
[data getBytes:&png_bytes->as_vector().at(0) length:data.length];
return png_bytes;
}
UIImage* UIImageFromPNG(const std::vector<gfx::ImagePNGRep>& image_png_reps) {
const float ideal_scale = ui::GetScaleForMaxSupportedResourceScaleFactor();
if (image_png_reps.empty())
return CreateErrorUIImage(ideal_scale);
// Find best match for |ideal_scale|.
float smallest_diff = std::numeric_limits<float>::max();
size_t closest_index = 0u;
for (size_t i = 0; i < image_png_reps.size(); ++i) {
const float scale = image_png_reps[i].scale;
const float diff = std::abs(ideal_scale - scale);
if (diff < smallest_diff) {
smallest_diff = diff;
closest_index = i;
}
}
return CreateUIImageFromImagePNGRep(image_png_reps[closest_index]);
}
scoped_refptr<base::RefCountedMemory> Get1xPNGBytesFromImageSkia(
const ImageSkia* skia) {
// iOS does not expose libpng, so conversion from ImageSkia to PNG must go
// through UIImage.
// TODO(rohitrao): Rewrite the callers of this function to save the UIImage
// representation in the gfx::Image. If we're generating it, we might as well
// hold on to it.
const gfx::ImageSkiaRep& image_skia_rep = skia->GetRepresentation(1.0f);
if (image_skia_rep.scale() != 1.0f)
return nullptr;
UIImage* image = UIImageFromImageSkiaRep(image_skia_rep);
return Get1xPNGBytesFromUIImage(image);
}
ImageSkia ImageSkiaFromPNG(
const std::vector<gfx::ImagePNGRep>& image_png_reps) {
// iOS does not expose libpng, so conversion from PNG to ImageSkia must go
// through UIImage.
ImageSkia image_skia;
for (const auto& image_png_rep : image_png_reps) {
UIImage* uiimage = CreateUIImageFromImagePNGRep(image_png_rep);
gfx::ImageSkiaRep image_skia_rep =
ImageSkiaRepOfScaleFromUIImage(uiimage, image_png_rep.scale);
if (!image_skia_rep.is_null())
image_skia.AddRepresentation(image_skia_rep);
}
return image_skia;
}
UIImage* UIImageOfImageRepCocoaTouch(const ImageRepCocoaTouch* image_rep) {
return image_rep->image();
}
std::unique_ptr<ImageRep> MakeImageRepCocoaTouch(UIImage* image) {
return std::make_unique<internal::ImageRepCocoaTouch>(image);
}
} // namespace internal
Image::Image(UIImage* image) {
if (image) {
storage_ = new internal::ImageStorage(Image::kImageRepCocoaTouch);
AddRepresentation(std::make_unique<internal::ImageRepCocoaTouch>(image));
}
}
} // namespace gfx
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