Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/graphics/Gradient.cpp

Index: Source/core/platform/graphics/Gradient.cpp
diff --git a/Source/core/platform/graphics/Gradient.cpp b/Source/core/platform/graphics/Gradient.cpp
deleted file mode 100644
index d1b700a4ff1b99b1e0817a57cd41f4ca4232f3e5..0000000000000000000000000000000000000000
--- a/Source/core/platform/graphics/Gradient.cpp
+++ /dev/null
@@ -1,282 +0,0 @@
-/*
- * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2007 Alp Toker <alp@atoker.com>
- * Copyright (C) 2013 Google 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 COMPUTER, 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 COMPUTER, 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 "core/platform/graphics/Gradient.h"
-
-#include "core/platform/graphics/GraphicsContext.h"
-#include "core/platform/graphics/skia/SkiaUtils.h"
-#include "platform/geometry/FloatRect.h"
-#include "platform/graphics/Color.h"
-#include "third_party/skia/include/core/SkColorShader.h"
-#include "third_party/skia/include/core/SkShader.h"
-#include "third_party/skia/include/effects/SkGradientShader.h"
-
-namespace WebCore {
-
-Gradient::Gradient(const FloatPoint& p0, const FloatPoint& p1)
-    : m_radial(false)
-    , m_p0(p0)
-    , m_p1(p1)
-    , m_r0(0)
-    , m_r1(0)
-    , m_aspectRatio(1)
-    , m_stopsSorted(false)
-    , m_spreadMethod(SpreadMethodPad)
-    , m_drawInPMColorSpace(false)
-{
-}
-
-Gradient::Gradient(const FloatPoint& p0, float r0, const FloatPoint& p1, float r1, float aspectRatio)
-    : m_radial(true)
-    , m_p0(p0)
-    , m_p1(p1)
-    , m_r0(r0)
-    , m_r1(r1)
-    , m_aspectRatio(aspectRatio)
-    , m_stopsSorted(false)
-    , m_spreadMethod(SpreadMethodPad)
-    , m_drawInPMColorSpace(false)
-{
-}
-
-Gradient::~Gradient()
-{
-}
-
-void Gradient::addColorStop(float value, const Color& color)
-{
-    float r;
-    float g;
-    float b;
-    float a;
-    color.getRGBA(r, g, b, a);
-    m_stops.append(ColorStop(value, r, g, b, a));
-
-    m_stopsSorted = false;
-    m_gradient.clear();
-}
-
-void Gradient::addColorStop(const Gradient::ColorStop& stop)
-{
-    m_stops.append(stop);
-
-    m_stopsSorted = false;
-    m_gradient.clear();
-}
-
-static inline bool compareStops(const Gradient::ColorStop& a, const Gradient::ColorStop& b)
-{
-    return a.stop < b.stop;
-}
-
-void Gradient::sortStopsIfNecessary()
-{
-    if (m_stopsSorted)
-        return;
-
-    m_stopsSorted = true;
-
-    if (!m_stops.size())
-        return;
-
-    std::stable_sort(m_stops.begin(), m_stops.end(), compareStops);
-}
-
-bool Gradient::hasAlpha() const
-{
-    for (size_t i = 0; i < m_stops.size(); i++) {
-        if (m_stops[i].alpha < 1)
-            return true;
-    }
-
-    return false;
-}
-
-void Gradient::setSpreadMethod(GradientSpreadMethod spreadMethod)
-{
-    // FIXME: Should it become necessary, allow calls to this method after m_gradient has been set.
-    ASSERT(!m_gradient);
-
-    if (m_spreadMethod == spreadMethod)
-        return;
-
-    m_spreadMethod = spreadMethod;
-}
-
-void Gradient::setDrawsInPMColorSpace(bool drawInPMColorSpace)
-{
-    if (drawInPMColorSpace == m_drawInPMColorSpace)
-        return;
-
-    m_drawInPMColorSpace = drawInPMColorSpace;
-    m_gradient.clear();
-}
-
-void Gradient::setGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation)
-{
-    if (m_gradientSpaceTransformation == gradientSpaceTransformation)
-        return;
-
-    m_gradientSpaceTransformation = gradientSpaceTransformation;
-    if (m_gradient)
-        m_gradient->setLocalMatrix(affineTransformToSkMatrix(m_gradientSpaceTransformation));
-}
-
-static inline U8CPU F2B(float x)
-{
-    return static_cast<int>(x * 255);
-}
-
-static SkColor makeSkColor(float a, float r, float g, float b)
-{
-    return SkColorSetARGB(F2B(a), F2B(r), F2B(g), F2B(b));
-}
-
-// Determine the total number of stops needed, including pseudo-stops at the
-// ends as necessary.
-static size_t totalStopsNeeded(const Gradient::ColorStop* stopData, size_t count)
-{
-    // N.B.: The tests in this function should kept in sync with the ones in
-    // fillStops(), or badness happens.
-    const Gradient::ColorStop* stop = stopData;
-    size_t countUsed = count;
-    if (count < 1 || stop->stop > 0.0)
-        countUsed++;
-    stop += count - 1;
-    if (count < 1 || stop->stop < 1.0)
-        countUsed++;
-    return countUsed;
-}
-
-// Collect sorted stop position and color information into the pos and colors
-// buffers, ensuring stops at both 0.0 and 1.0. The buffers must be large
-// enough to hold information for all stops, including the new endpoints if
-// stops at 0.0 and 1.0 aren't already included.
-static void fillStops(const Gradient::ColorStop* stopData,
-    size_t count, SkScalar* pos, SkColor* colors)
-{
-    const Gradient::ColorStop* stop = stopData;
-    size_t start = 0;
-    if (count < 1) {
-        // A gradient with no stops must be transparent black.
-        pos[0] = WebCoreFloatToSkScalar(0.0);
-        colors[0] = makeSkColor(0.0, 0.0, 0.0, 0.0);
-        start = 1;
-    } else if (stop->stop > 0.0) {
-        // Copy the first stop to 0.0. The first stop position may have a slight
-        // rounding error, but we don't care in this float comparison, since
-        // 0.0 comes through cleanly and people aren't likely to want a gradient
-        // with a stop at (0 + epsilon).
-        pos[0] = WebCoreFloatToSkScalar(0.0);
-        colors[0] = makeSkColor(stop->alpha, stop->red, stop->green, stop->blue);
-        start = 1;
-    }
-
-    for (size_t i = start; i < start + count; i++) {
-        pos[i] = WebCoreFloatToSkScalar(stop->stop);
-        colors[i] = makeSkColor(stop->alpha, stop->red, stop->green, stop->blue);
-        ++stop;
-    }
-
-    // Copy the last stop to 1.0 if needed. See comment above about this float
-    // comparison.
-    if (count < 1 || (--stop)->stop < 1.0) {
-        pos[start + count] = WebCoreFloatToSkScalar(1.0);
-        colors[start + count] = colors[start + count - 1];
-    }
-}
-
-SkShader* Gradient::shader()
-{
-    if (m_gradient)
-        return m_gradient.get();
-
-    sortStopsIfNecessary();
-    ASSERT(m_stopsSorted);
-
-    size_t countUsed = totalStopsNeeded(m_stops.data(), m_stops.size());
-    ASSERT(countUsed >= 2);
-    ASSERT(countUsed >= m_stops.size());
-
-    // FIXME: Why is all this manual pointer math needed?!
-    SkAutoMalloc storage(countUsed * (sizeof(SkColor) + sizeof(SkScalar)));
-    SkColor* colors = (SkColor*)storage.get();
-    SkScalar* pos = (SkScalar*)(colors + countUsed);
-
-    fillStops(m_stops.data(), m_stops.size(), pos, colors);
-
-    SkShader::TileMode tile = SkShader::kClamp_TileMode;
-    switch (m_spreadMethod) {
-    case SpreadMethodReflect:
-        tile = SkShader::kMirror_TileMode;
-        break;
-    case SpreadMethodRepeat:
-        tile = SkShader::kRepeat_TileMode;
-        break;
-    case SpreadMethodPad:
-        tile = SkShader::kClamp_TileMode;
-        break;
-    }
-
-    uint32_t shouldDrawInPMColorSpace = m_drawInPMColorSpace ? SkGradientShader::kInterpolateColorsInPremul_Flag : 0;
-    if (m_radial) {
-        // Since the two-point radial gradient is slower than the plain radial,
-        // only use it if we have to.
-        if (m_p0 == m_p1 && m_r0 <= 0.0f) {
-            m_gradient = adoptRef(SkGradientShader::CreateRadial(m_p1, m_r1, colors, pos, static_cast<int>(countUsed), tile, 0, shouldDrawInPMColorSpace));
-        } else {
-            // The radii we give to Skia must be positive. If we're given a
-            // negative radius, ask for zero instead.
-            SkScalar radius0 = m_r0 >= 0.0f ? WebCoreFloatToSkScalar(m_r0) : 0;
-            SkScalar radius1 = m_r1 >= 0.0f ? WebCoreFloatToSkScalar(m_r1) : 0;
-            m_gradient = adoptRef(SkGradientShader::CreateTwoPointConical(m_p0, radius0, m_p1, radius1, colors, pos, static_cast<int>(countUsed), tile, 0, shouldDrawInPMColorSpace));
-        }
-
-        if (aspectRatio() != 1) {
-            // CSS3 elliptical gradients: apply the elliptical scaling at the
-            // gradient center point.
-            m_gradientSpaceTransformation.translate(m_p0.x(), m_p0.y());
-            m_gradientSpaceTransformation.scale(1, 1 / aspectRatio());
-            m_gradientSpaceTransformation.translate(-m_p0.x(), -m_p0.y());
-            ASSERT(m_p0 == m_p1);
-        }
-    } else {
-        SkPoint pts[2] = { m_p0, m_p1 };
-        m_gradient = adoptRef(SkGradientShader::CreateLinear(pts, colors, pos, static_cast<int>(countUsed), tile, 0, shouldDrawInPMColorSpace));
-    }
-
-    if (!m_gradient) {
-        // use last color, since our "geometry" was degenerate (e.g. radius==0)
-        m_gradient = adoptRef(new SkColorShader(colors[countUsed - 1]));
-    } else {
-        m_gradient->setLocalMatrix(affineTransformToSkMatrix(m_gradientSpaceTransformation));
-    }
-    return m_gradient.get();
-}
-
-} //namespace