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/*
* Copyright (C) 2007 Alp Toker <alp@atoker.com>
* Copyright (C) 2008 Dirk Schulze <vbs85@gmx.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(SVG)
#include "SVGPaintServerGradient.h"
#include "SVGPaintServerLinearGradient.h"
#include "SVGPaintServerRadialGradient.h"
#include "GraphicsContext.h"
#include "RenderObject.h"
#include "RenderPath.h"
#include "RenderStyle.h"
#include "SVGGradientElement.h"
namespace WebCore {
bool SVGPaintServerGradient::setup(GraphicsContext*& context, const RenderObject* object, SVGPaintTargetType type, bool isPaintingText) const
{
m_ownerElement->buildGradient();
cairo_t* cr = context->platformContext();
cairo_pattern_t* pattern;
cairo_matrix_t matrix;
cairo_matrix_init_identity (&matrix);
const cairo_matrix_t gradient_matrix = gradientTransform();
const SVGRenderStyle* svgStyle = object->style()->svgStyle();
RenderStyle* style = object->style();
if (this->type() == LinearGradientPaintServer) {
const SVGPaintServerLinearGradient* linear = static_cast<const SVGPaintServerLinearGradient*>(this);
if (boundingBoxMode()) {
FloatRect bbox = object->relativeBBox(false);
if (bbox.width() == 0 || bbox.height() == 0) {
applyStrokeStyleToContext(context, style, object);
cairo_set_source_rgb(cr, 0, 0, 0);
return true;
}
cairo_matrix_translate(&matrix, bbox.x(), bbox.y());
cairo_matrix_scale(&matrix, bbox.width(), bbox.height());
}
double x0 = linear->gradientStart().x();
double y0 = linear->gradientStart().y();
double x1 = linear->gradientEnd().x();
double y1 = linear->gradientEnd().y();
pattern = cairo_pattern_create_linear(x0, y0, x1, y1);
} else if (this->type() == RadialGradientPaintServer) {
const SVGPaintServerRadialGradient* radial = static_cast<const SVGPaintServerRadialGradient*>(this);
if (boundingBoxMode()) {
FloatRect bbox = object->relativeBBox(false);
if (bbox.width() == 0 || bbox.height() == 0) {
applyStrokeStyleToContext(context, style, object);
cairo_set_source_rgb(cr, 0, 0, 0);
return true;
}
cairo_matrix_translate(&matrix, bbox.x(), bbox.y());
cairo_matrix_scale(&matrix, bbox.width(), bbox.height());
}
double cx = radial->gradientCenter().x();
double cy = radial->gradientCenter().y();
double radius = radial->gradientRadius();
double fx = radial->gradientFocal().x();
double fy = radial->gradientFocal().y();
fx -= cx;
fy -= cy;
double fradius = 0.0;
if (sqrt(fx * fx + fy * fy) >= radius) {
double angle = atan2(fy, fx);
if ((fx + cx) < cx)
fx = cos(angle) * radius + 0.002;
else
fx = cos(angle) * radius - 0.002;
if ((fy + cy) < cy)
fy = sin(angle) * radius + 0.002;
else
fy = sin(angle) * radius - 0.002;
}
pattern = cairo_pattern_create_radial(fx + cx, fy + cy, fradius, cx, cy, radius);
} else {
return false;
}
cairo_pattern_set_filter(pattern, CAIRO_FILTER_BILINEAR);
switch (spreadMethod()) {
case SpreadMethodPad:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
break;
case SpreadMethodReflect:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REFLECT);
break;
case SpreadMethodRepeat:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
break;
default:
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_NONE);
break;
}
cairo_matrix_multiply(&matrix, &matrix, &gradient_matrix);
cairo_matrix_invert(&matrix);
cairo_pattern_set_matrix(pattern, &matrix);
const Vector<SVGGradientStop>& stops = gradientStops();
for (unsigned i = 0; i < stops.size(); ++i) {
float offset = stops[i].first;
Color color = stops[i].second;
if (i > 0 && offset < stops[i - 1].first)
offset = stops[i - 1].first;
cairo_pattern_add_color_stop_rgba(pattern, offset, color.red() / 255.0, color.green() / 255.0, color.blue() / 255.0, color.alpha() / 255.0);
}
if ((type & ApplyToFillTargetType) && svgStyle->hasFill())
context->setFillRule(svgStyle->fillRule());
if ((type & ApplyToStrokeTargetType) && svgStyle->hasStroke())
applyStrokeStyleToContext(context, style, object);
cairo_set_source(cr, pattern);
cairo_pattern_destroy(pattern);
return true;
}
} // namespace WebCore
#endif
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