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// Copyright 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.h"
#import <UIKit/UIKit.h>
#include <cmath>
#include <limits>
#include "base/logging.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/mac/scoped_nsobject.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image_png_rep.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_util_ios.h"
namespace gfx {
namespace internal {
namespace {
// Returns a 16x16 red UIImage to visually show when a UIImage cannot be
// created from PNG data. Logs error as well.
// Caller takes ownership of returned UIImage.
UIImage* CreateErrorUIImage(float scale) {
LOG(ERROR) << "Unable to decode PNG into UIImage.";
base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
CGColorSpaceCreateDeviceRGB());
base::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
NULL, // Allow CG to allocate memory.
16, // width
16, // height
8, // bitsPerComponent
0, // CG will calculate by default.
color_space,
kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
CGContextSetRGBFillColor(context, 1.0, 0.0, 0.0, 1.0);
CGContextFillRect(context, CGRectMake(0.0, 0.0, 16, 16));
base::ScopedCFTypeRef<CGImageRef> cg_image(
CGBitmapContextCreateImage(context));
return [[UIImage imageWithCGImage:cg_image.get()
scale:scale
orientation:UIImageOrientationUp] retain];
}
// 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
scoped_refptr<base::RefCountedMemory> Get1xPNGBytesFromUIImage(
UIImage* uiimage) {
NSData* data = UIImagePNGRepresentation(uiimage);
if ([data length] == 0)
return NULL;
scoped_refptr<base::RefCountedBytes> png_bytes(
new base::RefCountedBytes());
png_bytes->data().resize([data length]);
[data getBytes:&png_bytes->data().at(0) length:[data length]];
return png_bytes;
}
UIImage* CreateUIImageFromPNG(
const std::vector<gfx::ImagePNGRep>& image_png_reps) {
float ideal_scale = ImageSkia::GetMaxSupportedScale();
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) {
float scale = image_png_reps[i].scale;
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 NULL;
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.
gfx::ImageSkia* image_skia = new gfx::ImageSkia();
for (size_t i = 0; i < image_png_reps.size(); ++i) {
base::scoped_nsobject<UIImage> uiimage(
CreateUIImageFromImagePNGRep(image_png_reps[i]));
gfx::ImageSkiaRep image_skia_rep = ImageSkiaRepOfScaleFromUIImage(
uiimage, image_png_reps[i].scale);
if (!image_skia_rep.is_null())
image_skia->AddRepresentation(image_skia_rep);
}
return image_skia;
}
gfx::Size UIImageSize(UIImage* image) {
int width = static_cast<int>(image.size.width);
int height = static_cast<int>(image.size.height);
return gfx::Size(width, height);
}
} // namespace internal
} // namespace gfx
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