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/*
* Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
*
* 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 "Gradient.h"
#include "Color.h"
#include "FloatRect.h"
#include <wtf/UnusedParam.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_lastStop(0)
, m_spreadMethod(SpreadMethodPad)
{
platformInit();
}
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_lastStop(0)
, m_spreadMethod(SpreadMethodPad)
{
platformInit();
}
Gradient::~Gradient()
{
platformDestroy();
}
void Gradient::adjustParametersForTiledDrawing(IntSize& size, FloatRect& srcRect)
{
if (m_radial)
return;
if (srcRect.isEmpty())
return;
if (m_p0.x() == m_p1.x()) {
size.setWidth(1);
srcRect.setWidth(1);
srcRect.setX(0);
return;
}
if (m_p0.y() != m_p1.y())
return;
size.setHeight(1);
srcRect.setHeight(1);
srcRect.setY(0);
}
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;
platformDestroy();
}
void Gradient::addColorStop(const Gradient::ColorStop& stop)
{
m_stops.append(stop);
m_stopsSorted = false;
platformDestroy();
}
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;
// Shortcut for the ideal case (ordered 2-stop gradient)
if (m_stops.size() == 2 && compareStops(*m_stops.begin(), *m_stops.end()))
return;
std::stable_sort(m_stops.begin(), m_stops.end(), compareStops);
}
void Gradient::getColor(float value, float* r, float* g, float* b, float* a) const
{
ASSERT(value >= 0);
ASSERT(value <= 1);
if (m_stops.isEmpty()) {
*r = 0;
*g = 0;
*b = 0;
*a = 0;
return;
}
if (!m_stopsSorted) {
if (m_stops.size())
std::stable_sort(m_stops.begin(), m_stops.end(), compareStops);
m_stopsSorted = true;
}
if (value <= 0 || value <= m_stops.first().stop) {
*r = m_stops.first().red;
*g = m_stops.first().green;
*b = m_stops.first().blue;
*a = m_stops.first().alpha;
return;
}
if (value >= 1 || value >= m_stops.last().stop) {
*r = m_stops.last().red;
*g = m_stops.last().green;
*b = m_stops.last().blue;
*a = m_stops.last().alpha;
return;
}
// Find stop before and stop after and interpolate.
int stop = findStop(value);
const ColorStop& lastStop = m_stops[stop];
const ColorStop& nextStop = m_stops[stop + 1];
float stopFraction = (value - lastStop.stop) / (nextStop.stop - lastStop.stop);
*r = lastStop.red + (nextStop.red - lastStop.red) * stopFraction;
*g = lastStop.green + (nextStop.green - lastStop.green) * stopFraction;
*b = lastStop.blue + (nextStop.blue - lastStop.blue) * stopFraction;
*a = lastStop.alpha + (nextStop.alpha - lastStop.alpha) * stopFraction;
}
int Gradient::findStop(float value) const
{
ASSERT(value >= 0);
ASSERT(value <= 1);
ASSERT(m_stopsSorted);
int numStops = m_stops.size();
ASSERT(numStops >= 2);
ASSERT(m_lastStop < numStops - 1);
int i = m_lastStop;
if (value < m_stops[i].stop)
i = 1;
else
i = m_lastStop + 1;
for (; i < numStops - 1; ++i)
if (value < m_stops[i].stop)
break;
m_lastStop = i - 1;
return m_lastStop;
}
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 == 0);
m_spreadMethod = spreadMethod;
}
void Gradient::setGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation)
{
m_gradientSpaceTransformation = gradientSpaceTransformation;
setPlatformGradientSpaceTransform(gradientSpaceTransformation);
}
#if !USE(SKIA) && !USE(CAIRO)
void Gradient::setPlatformGradientSpaceTransform(const AffineTransform&)
{
}
#endif
} //namespace
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