author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:28:30 +0100 | |
branch | RCL_3 |
changeset 94 | 919f36ff910f |
parent 93 | 79859ed3eea9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
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* Copyright (C) 2007 Alp Toker <alp@atoker.com> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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|
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#include "config.h" |
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#include "CanvasGradient.h" |
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#include "CSSParser.h" |
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#if PLATFORM(CG) |
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#include <ApplicationServices/ApplicationServices.h> |
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#elif PLATFORM(QT) |
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#include <QGradient> |
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#elif PLATFORM(CAIRO) |
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#include <cairo.h> |
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#endif |
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|
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namespace WebCore { |
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|
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CanvasGradient::CanvasGradient(const FloatPoint& p0, const FloatPoint& p1) |
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: m_radial(false), m_p0(p0), m_p1(p1), m_stopsSorted(false), m_lastStop(0) |
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#if PLATFORM(CG) |
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, m_shading(0) |
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#elif PLATFORM(QT) |
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, m_shading(0) |
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#elif PLATFORM(CAIRO) |
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, m_shading(0) |
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#endif |
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{ |
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} |
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|
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CanvasGradient::CanvasGradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1) |
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: m_radial(true), m_p0(p0), m_p1(p1), m_r0(r0), m_r1(r1), m_stopsSorted(false), m_lastStop(0) |
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#if PLATFORM(CG) |
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, m_shading(0) |
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#elif PLATFORM(QT) |
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, m_shading(0) |
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#elif PLATFORM(CAIRO) |
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, m_shading(0) |
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#endif |
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{ |
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} |
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|
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CanvasGradient::~CanvasGradient() |
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{ |
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#if PLATFORM(CG) |
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CGShadingRelease(m_shading); |
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#elif PLATFORM(QT) |
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delete m_shading; |
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#elif PLATFORM(CAIRO) |
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cairo_pattern_destroy(m_shading); |
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#endif |
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} |
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void CanvasGradient::addColorStop(float value, const String& color) |
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{ |
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RGBA32 rgba = CSSParser::parseColor(color); |
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m_stops.append(ColorStop(value, |
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((rgba >> 16) & 0xFF) / 255.0f, |
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((rgba >> 8) & 0xFF) / 255.0f, |
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(rgba & 0xFF) / 255.0f, |
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((rgba >> 24) & 0xFF) / 255.0f)); |
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m_stopsSorted = false; |
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|
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#if PLATFORM(CG) |
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CGShadingRelease(m_shading); |
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m_shading = 0; |
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#elif PLATFORM(QT) |
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delete m_shading; |
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m_shading = 0; |
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#elif PLATFORM(CAIRO) |
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cairo_pattern_destroy(m_shading); |
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m_shading = 0; |
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#endif |
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} |
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#if PLATFORM(CG) |
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|
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static void gradientCallback(void* info, const CGFloat* in, CGFloat* out) |
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{ |
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float r, g, b, a; |
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static_cast<CanvasGradient*>(info)->getColor(*in, &r, &g, &b, &a); |
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out[0] = r; |
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out[1] = g; |
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out[2] = b; |
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109 |
out[3] = a; |
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|
110 |
} |
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|
111 |
|
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112 |
CGShadingRef CanvasGradient::platformShading() |
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113 |
{ |
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if (m_shading) |
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return m_shading; |
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116 |
|
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const CGFloat intervalRanges[2] = { 0, 1 }; |
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const CGFloat colorComponentRanges[4 * 2] = { 0, 1, 0, 1, 0, 1, 0, 1 }; |
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const CGFunctionCallbacks gradientCallbacks = { 0, gradientCallback, 0 }; |
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CGFunctionRef colorFunction = CGFunctionCreate(this, 1, intervalRanges, 4, colorComponentRanges, &gradientCallbacks); |
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121 |
|
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); |
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123 |
|
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124 |
if (m_radial) |
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m_shading = CGShadingCreateRadial(colorSpace, m_p0, m_r0, m_p1, m_r1, colorFunction, true, true); |
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126 |
else |
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m_shading = CGShadingCreateAxial(colorSpace, m_p0, m_p1, colorFunction, true, true); |
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128 |
|
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129 |
CGColorSpaceRelease(colorSpace); |
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CGFunctionRelease(colorFunction); |
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131 |
|
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132 |
return m_shading; |
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133 |
} |
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134 |
|
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#elif PLATFORM(QT) |
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136 |
|
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QGradient* CanvasGradient::platformShading() |
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{ |
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139 |
if (m_shading) |
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140 |
return m_shading; |
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141 |
|
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142 |
if (m_radial) |
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143 |
m_shading = new QRadialGradient(m_p0.x(), m_p0.y(), m_r0, m_p1.x(), m_p1.y()); |
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else m_shading = new QLinearGradient(m_p0.x(), m_p0.y(), m_p1.x(), m_p1.y()); |
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145 |
|
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146 |
QColor stopColor; |
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Vector<ColorStop>::iterator stopIterator = m_stops.begin();; |
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while (stopIterator != m_stops.end()) { |
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stopColor.setRgbF(stopIterator->red, stopIterator->green, stopIterator->blue, stopIterator->alpha); |
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m_shading->setColorAt(stopIterator->stop, stopColor); |
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151 |
++stopIterator; |
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152 |
} |
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153 |
|
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154 |
return m_shading; |
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155 |
} |
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156 |
|
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157 |
#elif PLATFORM(CAIRO) |
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158 |
|
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cairo_pattern_t* CanvasGradient::platformShading() |
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160 |
{ |
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161 |
if (m_shading) |
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162 |
return m_shading; |
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163 |
|
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164 |
if (m_radial) |
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165 |
m_shading = cairo_pattern_create_radial(m_p0.x(), m_p0.y(), m_r0, m_p1.x(), m_p1.y(), m_r1); |
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166 |
else |
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167 |
m_shading = cairo_pattern_create_linear(m_p0.x(), m_p0.y(), m_p1.x(), m_p1.y()); |
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168 |
|
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169 |
Vector<ColorStop>::iterator stopIterator = m_stops.begin(); |
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170 |
while (stopIterator != m_stops.end()) { |
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171 |
cairo_pattern_add_color_stop_rgba(m_shading, stopIterator->stop, stopIterator->red, stopIterator->green, stopIterator->blue, stopIterator->alpha); |
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172 |
++stopIterator; |
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|
173 |
} |
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|
174 |
|
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175 |
return m_shading; |
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|
176 |
} |
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|
177 |
|
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178 |
#endif |
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179 |
|
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static inline bool compareStops(const CanvasGradient::ColorStop &a, const CanvasGradient::ColorStop &b) |
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181 |
{ |
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182 |
return a.stop < b.stop; |
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|
183 |
} |
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|
184 |
|
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185 |
void CanvasGradient::getColor(float value, float* r, float* g, float* b, float* a) |
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186 |
{ |
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187 |
ASSERT(value >= 0); |
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188 |
ASSERT(value <= 1); |
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|
189 |
|
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|
190 |
if (m_stops.isEmpty()) { |
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|
191 |
*r = 0; |
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192 |
*g = 0; |
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193 |
*b = 0; |
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194 |
*a = 0; |
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195 |
return; |
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|
196 |
} |
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|
197 |
if (!m_stopsSorted) { |
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|
198 |
if (m_stops.size()) |
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|
199 |
std::stable_sort(m_stops.begin(), m_stops.end(), compareStops); |
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200 |
m_stopsSorted = true; |
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|
201 |
} |
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|
202 |
if (value <= 0 || value <= m_stops.first().stop) { |
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|
203 |
*r = m_stops.first().red; |
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|
204 |
*g = m_stops.first().green; |
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|
205 |
*b = m_stops.first().blue; |
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|
206 |
*a = m_stops.first().alpha; |
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|
207 |
return; |
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|
208 |
} |
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|
209 |
if (value >= 1 || value >= m_stops.last().stop) { |
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|
210 |
*r = m_stops.last().red; |
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|
211 |
*g = m_stops.last().green; |
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|
212 |
*b = m_stops.last().blue; |
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|
213 |
*a = m_stops.last().alpha; |
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|
214 |
return; |
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} |
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// Find stop before and stop after and interpolate. |
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int stop = findStop(value); |
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const ColorStop& lastStop = m_stops[stop]; |
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const ColorStop& nextStop = m_stops[stop + 1]; |
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float stopFraction = (value - lastStop.stop) / (nextStop.stop - lastStop.stop); |
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*r = lastStop.red + (nextStop.red - lastStop.red) * stopFraction; |
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*g = lastStop.green + (nextStop.green - lastStop.green) * stopFraction; |
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*b = lastStop.blue + (nextStop.blue - lastStop.blue) * stopFraction; |
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*a = lastStop.alpha + (nextStop.alpha - lastStop.alpha) * stopFraction; |
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} |
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int CanvasGradient::findStop(float value) const |
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{ |
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ASSERT(value >= 0); |
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ASSERT(value <= 1); |
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ASSERT(m_stopsSorted); |
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int numStops = m_stops.size(); |
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ASSERT(numStops >= 2); |
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ASSERT(m_lastStop < numStops - 1); |
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|
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int i = m_lastStop; |
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if (value < m_stops[i].stop) |
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i = 1; |
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else |
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i = m_lastStop + 1; |
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|
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for (; i < numStops - 1; ++i) |
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if (value < m_stops[i].stop) |
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break; |
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|
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m_lastStop = i - 1; |
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return m_lastStop; |
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} |
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} //namespace |