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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImageGeneratorCG.h"
#include "SkPixmapPriv.h"
#ifdef SK_BUILD_FOR_MAC
#include <ApplicationServices/ApplicationServices.h>
#endif
#ifdef SK_BUILD_FOR_IOS
#include <CoreGraphics/CoreGraphics.h>
#include <ImageIO/ImageIO.h>
#include <MobileCoreServices/MobileCoreServices.h>
#endif
static CGImageSourceRef data_to_CGImageSrc(SkData* data) {
CGDataProviderRef cgData = CGDataProviderCreateWithData(data, data->data(), data->size(),
nullptr);
if (!cgData) {
return nullptr;
}
CGImageSourceRef imageSrc = CGImageSourceCreateWithDataProvider(cgData, 0);
CGDataProviderRelease(cgData);
return imageSrc;
}
std::unique_ptr<SkImageGenerator> SkImageGeneratorCG::MakeFromEncodedCG(sk_sp<SkData> data) {
CGImageSourceRef imageSrc = data_to_CGImageSrc(data.get());
if (!imageSrc) {
return nullptr;
}
// Make sure we call CFRelease to free the imageSrc. Since CFRelease actually takes
// a const void*, we must cast the imageSrc to a const void*.
SkAutoTCallVProc<const void, CFRelease> autoImageSrc(imageSrc);
CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(imageSrc, 0, nullptr);
if (!properties) {
return nullptr;
}
CFNumberRef widthRef = (CFNumberRef) (CFDictionaryGetValue(properties,
kCGImagePropertyPixelWidth));
CFNumberRef heightRef = (CFNumberRef) (CFDictionaryGetValue(properties,
kCGImagePropertyPixelHeight));
if (nullptr == widthRef || nullptr == heightRef) {
return nullptr;
}
int width, height;
if (!CFNumberGetValue(widthRef, kCFNumberIntType, &width) ||
!CFNumberGetValue(heightRef, kCFNumberIntType, &height)) {
return nullptr;
}
bool hasAlpha = (bool) (CFDictionaryGetValue(properties,
kCGImagePropertyHasAlpha));
SkAlphaType alphaType = hasAlpha ? kPremul_SkAlphaType : kOpaque_SkAlphaType;
SkImageInfo info = SkImageInfo::MakeS32(width, height, alphaType);
auto origin = kDefault_SkEncodedOrigin;
auto orientationRef = (CFNumberRef) (CFDictionaryGetValue(properties,
kCGImagePropertyOrientation));
int originInt;
if (orientationRef && CFNumberGetValue(orientationRef, kCFNumberIntType, &originInt)) {
origin = (SkEncodedOrigin) originInt;
}
if (SkPixmapPriv::ShouldSwapWidthHeight(origin)) {
info = SkPixmapPriv::SwapWidthHeight(info);
}
// FIXME: We have the opportunity to extract color space information here,
// though I think it makes sense to wait until we understand how
// we want to communicate it to the generator.
return std::unique_ptr<SkImageGenerator>(new SkImageGeneratorCG(info, autoImageSrc.release(),
std::move(data), origin));
}
SkImageGeneratorCG::SkImageGeneratorCG(const SkImageInfo& info, const void* imageSrc,
sk_sp<SkData> data, SkEncodedOrigin origin)
: INHERITED(info)
, fImageSrc(imageSrc)
, fData(std::move(data))
, fOrigin(origin)
{}
sk_sp<SkData> SkImageGeneratorCG::onRefEncodedData() {
return fData;
}
bool SkImageGeneratorCG::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
const Options&) {
if (kN32_SkColorType != info.colorType()) {
// FIXME: Support other colorTypes.
return false;
}
switch (info.alphaType()) {
case kOpaque_SkAlphaType:
if (kOpaque_SkAlphaType != this->getInfo().alphaType()) {
return false;
}
break;
case kPremul_SkAlphaType:
break;
default:
return false;
}
CGImageRef image = CGImageSourceCreateImageAtIndex((CGImageSourceRef) fImageSrc.get(), 0,
nullptr);
if (!image) {
return false;
}
SkAutoTCallVProc<CGImage, CGImageRelease> autoImage(image);
SkPixmap dst(info, pixels, rowBytes);
auto decode = [&image](const SkPixmap& pm) {
// FIXME: Using SkCopyPixelsFromCGImage (as opposed to swizzling
// ourselves) greatly restricts the color and alpha types that we
// support. If we swizzle ourselves, we can add support for:
// kUnpremul_SkAlphaType
// 16-bit per component RGBA
// kGray_8_SkColorType
// Additionally, it would be interesting to compare the performance
// of SkSwizzler with CG's built in swizzler.
return SkCopyPixelsFromCGImage(pm, image);
};
return SkPixmapPriv::Orient(dst, fOrigin, decode);
}
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