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/*
* Copyright (C) 2006, 2007, 2008 Apple Computer, 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 "GraphicsContextCG.h"
#include <ApplicationServices/ApplicationServices.h>
#include <wtf/RetainPtr.h>
namespace WebCore {
void Gradient::platformDestroy()
{
#if USE_CG_SHADING
CGShadingRelease(m_gradient);
#else
CGGradientRelease(m_gradient);
#endif
m_gradient = 0;
}
#if USE_CG_SHADING
static void gradientCallback(void* info, const CGFloat* in, CGFloat* out)
{
float r, g, b, a;
static_cast<const Gradient*>(info)->getColor(*in, &r, &g, &b, &a);
out[0] = r;
out[1] = g;
out[2] = b;
out[3] = a;
}
CGShadingRef Gradient::platformGradient()
{
if (m_gradient)
return m_gradient;
const CGFloat intervalRanges[2] = { 0, 1 };
const CGFloat colorComponentRanges[4 * 2] = { 0, 1, 0, 1, 0, 1, 0, 1 };
const CGFunctionCallbacks gradientCallbacks = { 0, gradientCallback, 0 };
RetainPtr<CGFunctionRef> colorFunction(AdoptCF, CGFunctionCreate(this, 1, intervalRanges, 4, colorComponentRanges, &gradientCallbacks));
CGColorSpaceRef colorSpace = deviceRGBColorSpaceRef();
if (m_radial)
m_gradient = CGShadingCreateRadial(colorSpace, m_p0, m_r0, m_p1, m_r1, colorFunction.get(), true, true);
else
m_gradient = CGShadingCreateAxial(colorSpace, m_p0, m_p1, colorFunction.get(), true, true);
return m_gradient;
}
#else
CGGradientRef Gradient::platformGradient()
{
if (m_gradient)
return m_gradient;
sortStopsIfNecessary();
const int cReservedStops = 3;
Vector<CGFloat, 4 * cReservedStops> colorComponents;
colorComponents.reserveCapacity(m_stops.size() * 4); // RGBA components per stop
Vector<CGFloat, cReservedStops> locations;
locations.reserveCapacity(m_stops.size());
for (size_t i = 0; i < m_stops.size(); ++i) {
colorComponents.uncheckedAppend(m_stops[i].red);
colorComponents.uncheckedAppend(m_stops[i].green);
colorComponents.uncheckedAppend(m_stops[i].blue);
colorComponents.uncheckedAppend(m_stops[i].alpha);
locations.uncheckedAppend(m_stops[i].stop);
}
m_gradient = CGGradientCreateWithColorComponents(deviceRGBColorSpaceRef(), colorComponents.data(), locations.data(), m_stops.size());
return m_gradient;
}
#endif
void Gradient::fill(GraphicsContext* context, const FloatRect& rect)
{
context->clip(rect);
paint(context);
}
void Gradient::paint(GraphicsContext* context)
{
CGContextRef ctx = context->platformContext();
paint(ctx);
}
void Gradient::paint(CGContextRef context)
{
#if USE_CG_SHADING
CGContextDrawShading(context, platformGradient());
#else
CGGradientDrawingOptions extendOptions = kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation;
if (m_radial) {
bool needScaling = aspectRatio() != 1;
if (needScaling) {
CGContextSaveGState(context);
// Scale from the center of the gradient. We only ever scale non-deprecated gradients,
// for which m_p0 == m_p1.
ASSERT(m_p0 == m_p1);
CGContextTranslateCTM(context, m_p0.x(), m_p0.y());
CGContextScaleCTM(context, 1, 1 / aspectRatio());
CGContextTranslateCTM(context, -m_p0.x(), -m_p0.y());
}
CGContextDrawRadialGradient(context, platformGradient(), m_p0, m_r0, m_p1, m_r1, extendOptions);
if (needScaling)
CGContextRestoreGState(context);
} else
CGContextDrawLinearGradient(context, platformGradient(), m_p0, m_p1, extendOptions);
#endif
}
} //namespace
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