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| 1 /* | |
| 2 * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved. | |
| 3 * Copyright (C) 2007 Alp Toker <alp@atoker.com> | |
| 4 * Copyright (C) 2013 Google Inc. All rights reserved. | |
| 5 * | |
| 6 * Redistribution and use in source and binary forms, with or without | |
| 7 * modification, are permitted provided that the following conditions | |
| 8 * are met: | |
| 9 * 1. Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * 2. Redistributions in binary form must reproduce the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer in the | |
| 13 * documentation and/or other materials provided with the distribution. | |
| 14 * | |
| 15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
| 16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
| 19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "config.h" | |
| 29 #include "core/platform/graphics/Gradient.h" | |
| 30 | |
| 31 #include "core/platform/graphics/GraphicsContext.h" | |
| 32 #include "core/platform/graphics/skia/SkiaUtils.h" | |
| 33 #include "platform/geometry/FloatRect.h" | |
| 34 #include "platform/graphics/Color.h" | |
| 35 #include "third_party/skia/include/core/SkColorShader.h" | |
| 36 #include "third_party/skia/include/core/SkShader.h" | |
| 37 #include "third_party/skia/include/effects/SkGradientShader.h" | |
| 38 | |
| 39 namespace WebCore { | |
| 40 | |
| 41 Gradient::Gradient(const FloatPoint& p0, const FloatPoint& p1) | |
| 42 : m_radial(false) | |
| 43 , m_p0(p0) | |
| 44 , m_p1(p1) | |
| 45 , m_r0(0) | |
| 46 , m_r1(0) | |
| 47 , m_aspectRatio(1) | |
| 48 , m_stopsSorted(false) | |
| 49 , m_spreadMethod(SpreadMethodPad) | |
| 50 , m_drawInPMColorSpace(false) | |
| 51 { | |
| 52 } | |
| 53 | |
| 54 Gradient::Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r
1, float aspectRatio) | |
| 55 : m_radial(true) | |
| 56 , m_p0(p0) | |
| 57 , m_p1(p1) | |
| 58 , m_r0(r0) | |
| 59 , m_r1(r1) | |
| 60 , m_aspectRatio(aspectRatio) | |
| 61 , m_stopsSorted(false) | |
| 62 , m_spreadMethod(SpreadMethodPad) | |
| 63 , m_drawInPMColorSpace(false) | |
| 64 { | |
| 65 } | |
| 66 | |
| 67 Gradient::~Gradient() | |
| 68 { | |
| 69 } | |
| 70 | |
| 71 void Gradient::addColorStop(float value, const Color& color) | |
| 72 { | |
| 73 float r; | |
| 74 float g; | |
| 75 float b; | |
| 76 float a; | |
| 77 color.getRGBA(r, g, b, a); | |
| 78 m_stops.append(ColorStop(value, r, g, b, a)); | |
| 79 | |
| 80 m_stopsSorted = false; | |
| 81 m_gradient.clear(); | |
| 82 } | |
| 83 | |
| 84 void Gradient::addColorStop(const Gradient::ColorStop& stop) | |
| 85 { | |
| 86 m_stops.append(stop); | |
| 87 | |
| 88 m_stopsSorted = false; | |
| 89 m_gradient.clear(); | |
| 90 } | |
| 91 | |
| 92 static inline bool compareStops(const Gradient::ColorStop& a, const Gradient::Co
lorStop& b) | |
| 93 { | |
| 94 return a.stop < b.stop; | |
| 95 } | |
| 96 | |
| 97 void Gradient::sortStopsIfNecessary() | |
| 98 { | |
| 99 if (m_stopsSorted) | |
| 100 return; | |
| 101 | |
| 102 m_stopsSorted = true; | |
| 103 | |
| 104 if (!m_stops.size()) | |
| 105 return; | |
| 106 | |
| 107 std::stable_sort(m_stops.begin(), m_stops.end(), compareStops); | |
| 108 } | |
| 109 | |
| 110 bool Gradient::hasAlpha() const | |
| 111 { | |
| 112 for (size_t i = 0; i < m_stops.size(); i++) { | |
| 113 if (m_stops[i].alpha < 1) | |
| 114 return true; | |
| 115 } | |
| 116 | |
| 117 return false; | |
| 118 } | |
| 119 | |
| 120 void Gradient::setSpreadMethod(GradientSpreadMethod spreadMethod) | |
| 121 { | |
| 122 // FIXME: Should it become necessary, allow calls to this method after m_gra
dient has been set. | |
| 123 ASSERT(!m_gradient); | |
| 124 | |
| 125 if (m_spreadMethod == spreadMethod) | |
| 126 return; | |
| 127 | |
| 128 m_spreadMethod = spreadMethod; | |
| 129 } | |
| 130 | |
| 131 void Gradient::setDrawsInPMColorSpace(bool drawInPMColorSpace) | |
| 132 { | |
| 133 if (drawInPMColorSpace == m_drawInPMColorSpace) | |
| 134 return; | |
| 135 | |
| 136 m_drawInPMColorSpace = drawInPMColorSpace; | |
| 137 m_gradient.clear(); | |
| 138 } | |
| 139 | |
| 140 void Gradient::setGradientSpaceTransform(const AffineTransform& gradientSpaceTra
nsformation) | |
| 141 { | |
| 142 if (m_gradientSpaceTransformation == gradientSpaceTransformation) | |
| 143 return; | |
| 144 | |
| 145 m_gradientSpaceTransformation = gradientSpaceTransformation; | |
| 146 if (m_gradient) | |
| 147 m_gradient->setLocalMatrix(affineTransformToSkMatrix(m_gradientSpaceTran
sformation)); | |
| 148 } | |
| 149 | |
| 150 static inline U8CPU F2B(float x) | |
| 151 { | |
| 152 return static_cast<int>(x * 255); | |
| 153 } | |
| 154 | |
| 155 static SkColor makeSkColor(float a, float r, float g, float b) | |
| 156 { | |
| 157 return SkColorSetARGB(F2B(a), F2B(r), F2B(g), F2B(b)); | |
| 158 } | |
| 159 | |
| 160 // Determine the total number of stops needed, including pseudo-stops at the | |
| 161 // ends as necessary. | |
| 162 static size_t totalStopsNeeded(const Gradient::ColorStop* stopData, size_t count
) | |
| 163 { | |
| 164 // N.B.: The tests in this function should kept in sync with the ones in | |
| 165 // fillStops(), or badness happens. | |
| 166 const Gradient::ColorStop* stop = stopData; | |
| 167 size_t countUsed = count; | |
| 168 if (count < 1 || stop->stop > 0.0) | |
| 169 countUsed++; | |
| 170 stop += count - 1; | |
| 171 if (count < 1 || stop->stop < 1.0) | |
| 172 countUsed++; | |
| 173 return countUsed; | |
| 174 } | |
| 175 | |
| 176 // Collect sorted stop position and color information into the pos and colors | |
| 177 // buffers, ensuring stops at both 0.0 and 1.0. The buffers must be large | |
| 178 // enough to hold information for all stops, including the new endpoints if | |
| 179 // stops at 0.0 and 1.0 aren't already included. | |
| 180 static void fillStops(const Gradient::ColorStop* stopData, | |
| 181 size_t count, SkScalar* pos, SkColor* colors) | |
| 182 { | |
| 183 const Gradient::ColorStop* stop = stopData; | |
| 184 size_t start = 0; | |
| 185 if (count < 1) { | |
| 186 // A gradient with no stops must be transparent black. | |
| 187 pos[0] = WebCoreFloatToSkScalar(0.0); | |
| 188 colors[0] = makeSkColor(0.0, 0.0, 0.0, 0.0); | |
| 189 start = 1; | |
| 190 } else if (stop->stop > 0.0) { | |
| 191 // Copy the first stop to 0.0. The first stop position may have a slight | |
| 192 // rounding error, but we don't care in this float comparison, since | |
| 193 // 0.0 comes through cleanly and people aren't likely to want a gradient | |
| 194 // with a stop at (0 + epsilon). | |
| 195 pos[0] = WebCoreFloatToSkScalar(0.0); | |
| 196 colors[0] = makeSkColor(stop->alpha, stop->red, stop->green, stop->blue)
; | |
| 197 start = 1; | |
| 198 } | |
| 199 | |
| 200 for (size_t i = start; i < start + count; i++) { | |
| 201 pos[i] = WebCoreFloatToSkScalar(stop->stop); | |
| 202 colors[i] = makeSkColor(stop->alpha, stop->red, stop->green, stop->blue)
; | |
| 203 ++stop; | |
| 204 } | |
| 205 | |
| 206 // Copy the last stop to 1.0 if needed. See comment above about this float | |
| 207 // comparison. | |
| 208 if (count < 1 || (--stop)->stop < 1.0) { | |
| 209 pos[start + count] = WebCoreFloatToSkScalar(1.0); | |
| 210 colors[start + count] = colors[start + count - 1]; | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 SkShader* Gradient::shader() | |
| 215 { | |
| 216 if (m_gradient) | |
| 217 return m_gradient.get(); | |
| 218 | |
| 219 sortStopsIfNecessary(); | |
| 220 ASSERT(m_stopsSorted); | |
| 221 | |
| 222 size_t countUsed = totalStopsNeeded(m_stops.data(), m_stops.size()); | |
| 223 ASSERT(countUsed >= 2); | |
| 224 ASSERT(countUsed >= m_stops.size()); | |
| 225 | |
| 226 // FIXME: Why is all this manual pointer math needed?! | |
| 227 SkAutoMalloc storage(countUsed * (sizeof(SkColor) + sizeof(SkScalar))); | |
| 228 SkColor* colors = (SkColor*)storage.get(); | |
| 229 SkScalar* pos = (SkScalar*)(colors + countUsed); | |
| 230 | |
| 231 fillStops(m_stops.data(), m_stops.size(), pos, colors); | |
| 232 | |
| 233 SkShader::TileMode tile = SkShader::kClamp_TileMode; | |
| 234 switch (m_spreadMethod) { | |
| 235 case SpreadMethodReflect: | |
| 236 tile = SkShader::kMirror_TileMode; | |
| 237 break; | |
| 238 case SpreadMethodRepeat: | |
| 239 tile = SkShader::kRepeat_TileMode; | |
| 240 break; | |
| 241 case SpreadMethodPad: | |
| 242 tile = SkShader::kClamp_TileMode; | |
| 243 break; | |
| 244 } | |
| 245 | |
| 246 uint32_t shouldDrawInPMColorSpace = m_drawInPMColorSpace ? SkGradientShader:
:kInterpolateColorsInPremul_Flag : 0; | |
| 247 if (m_radial) { | |
| 248 // Since the two-point radial gradient is slower than the plain radial, | |
| 249 // only use it if we have to. | |
| 250 if (m_p0 == m_p1 && m_r0 <= 0.0f) { | |
| 251 m_gradient = adoptRef(SkGradientShader::CreateRadial(m_p1, m_r1, col
ors, pos, static_cast<int>(countUsed), tile, 0, shouldDrawInPMColorSpace)); | |
| 252 } else { | |
| 253 // The radii we give to Skia must be positive. If we're given a | |
| 254 // negative radius, ask for zero instead. | |
| 255 SkScalar radius0 = m_r0 >= 0.0f ? WebCoreFloatToSkScalar(m_r0) : 0; | |
| 256 SkScalar radius1 = m_r1 >= 0.0f ? WebCoreFloatToSkScalar(m_r1) : 0; | |
| 257 m_gradient = adoptRef(SkGradientShader::CreateTwoPointConical(m_p0,
radius0, m_p1, radius1, colors, pos, static_cast<int>(countUsed), tile, 0, shoul
dDrawInPMColorSpace)); | |
| 258 } | |
| 259 | |
| 260 if (aspectRatio() != 1) { | |
| 261 // CSS3 elliptical gradients: apply the elliptical scaling at the | |
| 262 // gradient center point. | |
| 263 m_gradientSpaceTransformation.translate(m_p0.x(), m_p0.y()); | |
| 264 m_gradientSpaceTransformation.scale(1, 1 / aspectRatio()); | |
| 265 m_gradientSpaceTransformation.translate(-m_p0.x(), -m_p0.y()); | |
| 266 ASSERT(m_p0 == m_p1); | |
| 267 } | |
| 268 } else { | |
| 269 SkPoint pts[2] = { m_p0, m_p1 }; | |
| 270 m_gradient = adoptRef(SkGradientShader::CreateLinear(pts, colors, pos, s
tatic_cast<int>(countUsed), tile, 0, shouldDrawInPMColorSpace)); | |
| 271 } | |
| 272 | |
| 273 if (!m_gradient) { | |
| 274 // use last color, since our "geometry" was degenerate (e.g. radius==0) | |
| 275 m_gradient = adoptRef(new SkColorShader(colors[countUsed - 1])); | |
| 276 } else { | |
| 277 m_gradient->setLocalMatrix(affineTransformToSkMatrix(m_gradientSpaceTran
sformation)); | |
| 278 } | |
| 279 return m_gradient.get(); | |
| 280 } | |
| 281 | |
| 282 } //namespace | |
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Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk