| /* |
| * Copyright (C) 2006-2017 Apple Inc. All rights reserved. |
| * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) |
| * |
| * 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. |
| */ |
| |
| #pragma once |
| |
| #include "CanvasGradient.h" |
| #include "CanvasPattern.h" |
| #include "Color.h" |
| #include <wtf/Variant.h> |
| |
| namespace WebCore { |
| |
| class Document; |
| class GraphicsContext; |
| class HTMLCanvasElement; |
| |
| class CanvasStyle { |
| public: |
| CanvasStyle(); |
| CanvasStyle(Color); |
| CanvasStyle(float grayLevel, float alpha); |
| CanvasStyle(float r, float g, float b, float alpha); |
| CanvasStyle(float c, float m, float y, float k, float alpha); |
| CanvasStyle(CanvasGradient&); |
| CanvasStyle(CanvasPattern&); |
| |
| static CanvasStyle createFromString(const String& color); |
| static CanvasStyle createFromStringWithOverrideAlpha(const String& color, float alpha); |
| |
| bool isValid() const { return !WTF::holds_alternative<Invalid>(m_style); } |
| bool isCurrentColor() const { return WTF::holds_alternative<CurrentColor>(m_style); } |
| bool hasOverrideAlpha() const { return isCurrentColor() && WTF::get<CurrentColor>(m_style).overrideAlpha; } |
| float overrideAlpha() const { return WTF::get<CurrentColor>(m_style).overrideAlpha.value(); } |
| |
| String color() const; |
| RefPtr<CanvasGradient> canvasGradient() const; |
| RefPtr<CanvasPattern> canvasPattern() const; |
| |
| void applyFillColor(GraphicsContext&) const; |
| void applyStrokeColor(GraphicsContext&) const; |
| |
| bool isEquivalentColor(const CanvasStyle&) const; |
| bool isEquivalentRGBA(float red, float green, float blue, float alpha) const; |
| bool isEquivalentCMYKA(float cyan, float magenta, float yellow, float black, float alpha) const; |
| |
| private: |
| struct Invalid { }; |
| |
| struct CMYKAColor { |
| #if !COMPILER_SUPPORTS(NSDMI_FOR_AGGREGATES) |
| CMYKAColor() = default; |
| CMYKAColor(Color color, float cyan, float magenta, float yellow, float black, float alpha) |
| : color(color), c(cyan), m(magenta), y(yellow), k(black), a(alpha) |
| { |
| } |
| #endif |
| |
| Color color; |
| float c { 0 }; |
| float m { 0 }; |
| float y { 0 }; |
| float k { 0 }; |
| float a { 0 }; |
| }; |
| |
| struct CurrentColor { |
| std::optional<float> overrideAlpha; |
| }; |
| |
| CanvasStyle(CurrentColor); |
| |
| Variant<Invalid, Color, CMYKAColor, RefPtr<CanvasGradient>, RefPtr<CanvasPattern>, CurrentColor> m_style; |
| }; |
| |
| Color currentColor(HTMLCanvasElement*); |
| Color parseColorOrCurrentColor(const String& colorString, HTMLCanvasElement*); |
| |
| inline CanvasStyle::CanvasStyle() |
| : m_style(Invalid { }) |
| { |
| } |
| |
| inline RefPtr<CanvasGradient> CanvasStyle::canvasGradient() const |
| { |
| if (!WTF::holds_alternative<RefPtr<CanvasGradient>>(m_style)) |
| return nullptr; |
| return WTF::get<RefPtr<CanvasGradient>>(m_style); |
| } |
| |
| inline RefPtr<CanvasPattern> CanvasStyle::canvasPattern() const |
| { |
| if (!WTF::holds_alternative<RefPtr<CanvasPattern>>(m_style)) |
| return nullptr; |
| return WTF::get<RefPtr<CanvasPattern>>(m_style); |
| } |
| |
| inline String CanvasStyle::color() const |
| { |
| auto& color = WTF::holds_alternative<Color>(m_style) ? WTF::get<Color>(m_style) : WTF::get<CMYKAColor>(m_style).color; |
| return color.serialized(); |
| } |
| |
| } // namespace WebCore |