diff options
author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
---|---|---|
committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/platform/graphics/cg/GradientCG.cpp | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/platform/graphics/cg/GradientCG.cpp')
-rw-r--r-- | Source/WebCore/platform/graphics/cg/GradientCG.cpp | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/Source/WebCore/platform/graphics/cg/GradientCG.cpp b/Source/WebCore/platform/graphics/cg/GradientCG.cpp new file mode 100644 index 0000000..974dd6b --- /dev/null +++ b/Source/WebCore/platform/graphics/cg/GradientCG.cpp @@ -0,0 +1,145 @@ +/* + * 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 |