1 /* 2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2007 Alp Toker <alp (at) atoker.com> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "config.h" 28 #include "Gradient.h" 29 30 #include "GraphicsContextCG.h" 31 #include <ApplicationServices/ApplicationServices.h> 32 #include <wtf/RetainPtr.h> 33 34 namespace WebCore { 35 36 void Gradient::platformDestroy() 37 { 38 #if USE_CG_SHADING 39 CGShadingRelease(m_gradient); 40 #else 41 CGGradientRelease(m_gradient); 42 #endif 43 m_gradient = 0; 44 } 45 46 #if USE_CG_SHADING 47 static void gradientCallback(void* info, const CGFloat* in, CGFloat* out) 48 { 49 float r, g, b, a; 50 static_cast<const Gradient*>(info)->getColor(*in, &r, &g, &b, &a); 51 out[0] = r; 52 out[1] = g; 53 out[2] = b; 54 out[3] = a; 55 } 56 57 CGShadingRef Gradient::platformGradient() 58 { 59 if (m_gradient) 60 return m_gradient; 61 62 const CGFloat intervalRanges[2] = { 0, 1 }; 63 const CGFloat colorComponentRanges[4 * 2] = { 0, 1, 0, 1, 0, 1, 0, 1 }; 64 const CGFunctionCallbacks gradientCallbacks = { 0, gradientCallback, 0 }; 65 RetainPtr<CGFunctionRef> colorFunction(AdoptCF, CGFunctionCreate(this, 1, intervalRanges, 4, colorComponentRanges, &gradientCallbacks)); 66 67 CGColorSpaceRef colorSpace = deviceRGBColorSpaceRef(); 68 69 if (m_radial) 70 m_gradient = CGShadingCreateRadial(colorSpace, m_p0, m_r0, m_p1, m_r1, colorFunction.get(), true, true); 71 else 72 m_gradient = CGShadingCreateAxial(colorSpace, m_p0, m_p1, colorFunction.get(), true, true); 73 74 return m_gradient; 75 } 76 #else 77 CGGradientRef Gradient::platformGradient() 78 { 79 if (m_gradient) 80 return m_gradient; 81 82 sortStopsIfNecessary(); 83 84 const int cReservedStops = 3; 85 Vector<CGFloat, 4 * cReservedStops> colorComponents; 86 colorComponents.reserveCapacity(m_stops.size() * 4); // RGBA components per stop 87 88 Vector<CGFloat, cReservedStops> locations; 89 locations.reserveCapacity(m_stops.size()); 90 91 for (size_t i = 0; i < m_stops.size(); ++i) { 92 colorComponents.uncheckedAppend(m_stops[i].red); 93 colorComponents.uncheckedAppend(m_stops[i].green); 94 colorComponents.uncheckedAppend(m_stops[i].blue); 95 colorComponents.uncheckedAppend(m_stops[i].alpha); 96 97 locations.uncheckedAppend(m_stops[i].stop); 98 } 99 100 m_gradient = CGGradientCreateWithColorComponents(deviceRGBColorSpaceRef(), colorComponents.data(), locations.data(), m_stops.size()); 101 102 return m_gradient; 103 } 104 #endif 105 106 void Gradient::fill(GraphicsContext* context, const FloatRect& rect) 107 { 108 context->clip(rect); 109 paint(context); 110 } 111 112 void Gradient::paint(GraphicsContext* context) 113 { 114 CGContextRef ctx = context->platformContext(); 115 paint(ctx); 116 } 117 118 void Gradient::paint(CGContextRef context) 119 { 120 #if USE_CG_SHADING 121 CGContextDrawShading(context, platformGradient()); 122 #else 123 CGGradientDrawingOptions extendOptions = kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation; 124 if (m_radial) { 125 bool needScaling = aspectRatio() != 1; 126 if (needScaling) { 127 CGContextSaveGState(context); 128 // Scale from the center of the gradient. We only ever scale non-deprecated gradients, 129 // for which m_p0 == m_p1. 130 ASSERT(m_p0 == m_p1); 131 CGContextTranslateCTM(context, m_p0.x(), m_p0.y()); 132 CGContextScaleCTM(context, 1, 1 / aspectRatio()); 133 CGContextTranslateCTM(context, -m_p0.x(), -m_p0.y()); 134 } 135 136 CGContextDrawRadialGradient(context, platformGradient(), m_p0, m_r0, m_p1, m_r1, extendOptions); 137 138 if (needScaling) 139 CGContextRestoreGState(context); 140 } else 141 CGContextDrawLinearGradient(context, platformGradient(), m_p0, m_p1, extendOptions); 142 #endif 143 } 144 145 } //namespace 146