| /* |
| * Copyright (C) 2003-2021 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "Color.h" |
| |
| #if USE(CG) |
| |
| #include "ColorSpaceCG.h" |
| #include "DestinationColorSpace.h" |
| #include <mutex> |
| #include <pal/spi/cg/CoreGraphicsSPI.h> |
| #include <wtf/Assertions.h> |
| #include <wtf/Lock.h> |
| #include <wtf/RetainPtr.h> |
| #include <wtf/StdLibExtras.h> |
| #include <wtf/TinyLRUCache.h> |
| |
| namespace WebCore { |
| static RetainPtr<CGColorRef> createCGColor(const Color&); |
| } |
| |
| namespace WTF { |
| |
| template<> |
| RetainPtr<CGColorRef> TinyLRUCachePolicy<WebCore::Color, RetainPtr<CGColorRef>>::createValueForKey(const WebCore::Color& color) |
| { |
| return WebCore::createCGColor(color); |
| } |
| |
| } // namespace WTF |
| |
| namespace WebCore { |
| |
| std::optional<SRGBA<uint8_t>> roundAndClampToSRGBALossy(CGColorRef color) |
| { |
| // FIXME: Interpreting components of a color in an arbitrary color space |
| // as sRGB could be wrong, not just lossy. |
| |
| if (!color) |
| return std::nullopt; |
| |
| size_t numComponents = CGColorGetNumberOfComponents(color); |
| const CGFloat* components = CGColorGetComponents(color); |
| |
| float r = 0; |
| float g = 0; |
| float b = 0; |
| float a = 0; |
| |
| switch (numComponents) { |
| case 2: |
| r = g = b = components[0]; |
| a = components[1]; |
| break; |
| case 4: |
| r = components[0]; |
| g = components[1]; |
| b = components[2]; |
| a = components[3]; |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| |
| return convertColor<SRGBA<uint8_t>>(makeFromComponentsClamping<SRGBA<float>>(r, g, b, a )); |
| } |
| |
| template<ColorSpace space> |
| static CGColorTransformRef cachedCGColorTransform() |
| { |
| static LazyNeverDestroyed<RetainPtr<CGColorTransformRef>> transform; |
| |
| static std::once_flag onceFlag; |
| std::call_once(onceFlag, [] { |
| transform.construct(adoptCF(CGColorTransformCreate(cachedCGColorSpace<space>(), nullptr))); |
| }); |
| |
| return transform->get(); |
| } |
| |
| Color Color::createAndLosslesslyConvertToSupportedColorSpace(CGColorRef color, OptionSet<Flags> flags) |
| { |
| // FIXME: This should probably use ExtendedSRGBA rather than XYZ_D50, as it is a more commonly used color space and just as expressive. |
| constexpr auto destinationColorSpace = HasCGColorSpaceMapping<ColorSpace::XYZ_D50> ? ColorSpace::XYZ_D50 : ColorSpace::SRGB; |
| ASSERT(CGColorSpaceGetNumberOfComponents(cachedCGColorSpace<destinationColorSpace>()) == 3); |
| |
| auto sourceCGColorSpace = CGColorGetColorSpace(color); |
| auto sourceComponents = CGColorGetComponents(color); |
| std::array<CGFloat, 3> destinationComponents { }; |
| |
| auto result = CGColorTransformConvertColorComponents(cachedCGColorTransform<destinationColorSpace>(), sourceCGColorSpace, kCGRenderingIntentDefault, sourceComponents, destinationComponents.data()); |
| ASSERT_UNUSED(result, result); |
| |
| float a = destinationComponents[0]; |
| float b = destinationComponents[1]; |
| float c = destinationComponents[2]; |
| float alpha = CGColorGetAlpha(color); |
| |
| return Color(OutOfLineComponents::create({ a, b, c, alpha }), destinationColorSpace, flags); |
| } |
| |
| Color Color::createAndPreserveColorSpace(CGColorRef color, OptionSet<Flags> flags) |
| { |
| if (!color) |
| return Color(); |
| |
| size_t numComponents = CGColorGetNumberOfComponents(color); |
| auto colorSpace = colorSpaceForCGColorSpace(CGColorGetColorSpace(color)); |
| |
| if (numComponents != 4 || !colorSpace) |
| return createAndLosslesslyConvertToSupportedColorSpace(color, flags); |
| |
| const CGFloat* components = CGColorGetComponents(color); |
| |
| float a = components[0]; |
| float b = components[1]; |
| float c = components[2]; |
| float alpha = components[3]; |
| |
| return Color(OutOfLineComponents::create({ a, b, c, alpha }), *colorSpace, flags); |
| } |
| |
| static std::pair<CGColorSpaceRef, ColorComponents<float, 4>> convertToCGCompatibleComponents(ColorSpace colorSpace, ColorComponents<float, 4> components) |
| { |
| // Some CG ports don't support all the color spaces required and return |
| // nullptr for unsupported color spaces. In those cases, we eagerly convert |
| // the color into either extended sRGB or normal sRGB, if extended sRGB is |
| // not supported. |
| |
| using FallbackColorType = std::conditional_t<HasCGColorSpaceMapping<ColorSpace::ExtendedSRGB>, ExtendedSRGBA<float>, SRGBA<float>>; |
| |
| if (auto cgColorSpace = cachedNullableCGColorSpace(colorSpace)) |
| return { cgColorSpace, components }; |
| |
| auto componentsConvertedToFallbackColorSpace = callWithColorType(components, colorSpace, [] (const auto& color) { |
| return asColorComponents(convertColor<FallbackColorType>(color).resolved()); |
| }); |
| return { cachedCGColorSpace<ColorSpaceFor<FallbackColorType>>(), componentsConvertedToFallbackColorSpace }; |
| } |
| |
| static RetainPtr<CGColorRef> createCGColor(const Color& color) |
| { |
| auto [colorSpace, components] = color.colorSpaceAndResolvedColorComponents(); |
| auto [cgColorSpace, cgCompatibleComponents] = convertToCGCompatibleComponents(colorSpace, components); |
| |
| auto [c1, c2, c3, c4] = cgCompatibleComponents; |
| std::array<CGFloat, 4> cgFloatComponents { c1, c2, c3, c4 }; |
| |
| return adoptCF(CGColorCreate(cgColorSpace, cgFloatComponents.data())); |
| } |
| |
| RetainPtr<CGColorRef> cachedCGColor(const Color& color) |
| { |
| if (auto srgb = color.tryGetAsSRGBABytes()) { |
| switch (PackedColor::RGBA { *srgb }.value) { |
| case PackedColor::RGBA { Color::transparentBlack }.value: { |
| static LazyNeverDestroyed<RetainPtr<CGColorRef>> transparentCGColor; |
| static std::once_flag onceFlag; |
| std::call_once(onceFlag, [] { |
| transparentCGColor.construct(createCGColor(Color::transparentBlack)); |
| }); |
| return transparentCGColor.get(); |
| } |
| case PackedColor::RGBA { Color::black }.value: { |
| static LazyNeverDestroyed<RetainPtr<CGColorRef>> blackCGColor; |
| static std::once_flag onceFlag; |
| std::call_once(onceFlag, [] { |
| blackCGColor.construct(createCGColor(Color::black)); |
| }); |
| return blackCGColor.get(); |
| } |
| case PackedColor::RGBA { Color::white }.value: { |
| static LazyNeverDestroyed<RetainPtr<CGColorRef>> whiteCGColor; |
| static std::once_flag onceFlag; |
| std::call_once(onceFlag, [] { |
| whiteCGColor.construct(createCGColor(Color::white)); |
| }); |
| return whiteCGColor.get(); |
| } |
| } |
| } |
| |
| static Lock cachedColorLock; |
| Locker locker { cachedColorLock }; |
| |
| static NeverDestroyed<TinyLRUCache<Color, RetainPtr<CGColorRef>, 32>> cache; |
| return cache.get().get(color); |
| } |
| |
| ColorComponents<float, 4> platformConvertColorComponents(ColorSpace inputColorSpace, ColorComponents<float, 4> inputColorComponents, const DestinationColorSpace& outputColorSpace) |
| { |
| // FIXME: Investigate optimizing this to use the builtin color conversion code for supported color spaces. |
| |
| auto [cgInputColorSpace, cgCompatibleComponents] = convertToCGCompatibleComponents(inputColorSpace, inputColorComponents); |
| if (cgInputColorSpace == outputColorSpace.platformColorSpace()) |
| return cgCompatibleComponents; |
| |
| auto [c1, c2, c3, c4] = cgCompatibleComponents; |
| std::array<CGFloat, 4> sourceComponents { c1, c2, c3, c4 }; |
| std::array<CGFloat, 4> destinationComponents { }; |
| |
| auto transform = adoptCF(CGColorTransformCreate(outputColorSpace.platformColorSpace(), nullptr)); |
| auto result = CGColorTransformConvertColorComponents(transform.get(), cgInputColorSpace, kCGRenderingIntentDefault, sourceComponents.data(), destinationComponents.data()); |
| ASSERT_UNUSED(result, result); |
| // FIXME: CGColorTransformConvertColorComponents doesn't copy over any alpha component. |
| return { static_cast<float>(destinationComponents[0]), static_cast<float>(destinationComponents[1]), static_cast<float>(destinationComponents[2]), static_cast<float>(destinationComponents[3]) }; |
| } |
| |
| } |
| |
| #endif // USE(CG) |