#include "config.h"
#include "Gradient.h"
#include "CSSParser.h"
#include "GraphicsContext.h"
#include "PlatformContextCairo.h"
#include <cairo.h>
namespace WebCore {
void Gradient::platformDestroy()
{
if (m_gradient) {
cairo_pattern_destroy(m_gradient);
m_gradient = 0;
}
}
cairo_pattern_t* Gradient::platformGradient()
{
return platformGradient(1);
}
cairo_pattern_t* Gradient::platformGradient(float globalAlpha)
{
if (m_gradient && m_platformGradientAlpha == globalAlpha)
return m_gradient;
platformDestroy();
m_platformGradientAlpha = globalAlpha;
if (m_radial)
m_gradient = cairo_pattern_create_radial(m_p0.x(), m_p0.y(), m_r0, m_p1.x(), m_p1.y(), m_r1);
else
m_gradient = cairo_pattern_create_linear(m_p0.x(), m_p0.y(), m_p1.x(), m_p1.y());
Vector<ColorStop>::iterator stopIterator = m_stops.begin();
while (stopIterator != m_stops.end()) {
cairo_pattern_add_color_stop_rgba(m_gradient, stopIterator->stop,
stopIterator->red, stopIterator->green, stopIterator->blue,
stopIterator->alpha * globalAlpha);
++stopIterator;
}
switch (m_spreadMethod) {
case SpreadMethodPad:
cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_PAD);
break;
case SpreadMethodReflect:
cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_REFLECT);
break;
case SpreadMethodRepeat:
cairo_pattern_set_extend(m_gradient, CAIRO_EXTEND_REPEAT);
break;
}
cairo_matrix_t matrix = m_gradientSpaceTransformation;
cairo_matrix_invert(&matrix);
cairo_pattern_set_matrix(m_gradient, &matrix);
return m_gradient;
}
void Gradient::setPlatformGradientSpaceTransform(const AffineTransform& gradientSpaceTransformation)
{
if (m_gradient) {
cairo_matrix_t matrix = gradientSpaceTransformation;
cairo_matrix_invert(&matrix);
cairo_pattern_set_matrix(m_gradient, &matrix);
}
}
void Gradient::fill(GraphicsContext* context, const FloatRect& rect)
{
cairo_t* cr = context->platformContext()->cr();
context->save();
cairo_set_source(cr, platformGradient());
cairo_rectangle(cr, rect.x(), rect.y(), rect.width(), rect.height());
cairo_fill(cr);
context->restore();
}
}