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/*
* Copyright 2006, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 "android_graphics.h"
#include "CSSParser.h"
#include "GraphicsContext.h"
#include "NotImplemented.h"
#include "SkCanvas.h"
#include "SkColorShader.h"
#include "SkGradientShader.h"
#include "SkPaint.h"
class PlatformGradientRec {
public:
PlatformGradientRec() : m_shader(NULL) {}
~PlatformGradientRec() { SkSafeUnref(m_shader); }
SkShader* m_shader;
SkShader::TileMode m_tileMode;
int m_colorCountWhenShaderWasBuilt;
};
namespace WebCore {
void Gradient::platformDestroy()
{
delete m_gradient;
m_gradient = 0;
}
static U8CPU F2B(float x)
{
return (int)(x * 255);
}
SkShader* Gradient::getShader(SkShader::TileMode mode)
{
if (NULL == m_gradient)
m_gradient = new PlatformGradientRec;
else if (mode == m_gradient->m_tileMode)
return m_gradient->m_shader;
// need to ensure that the m_stops array is sorted. We call getColor()
// which, as a side effect, does the sort.
// TODO: refactor Gradient.h to formally expose a sort method
{
float r, g, b, a;
this->getColor(0, &r, &g, &b, &a);
}
SkPoint pts[2] = { m_p0, m_p1 }; // convert to SkPoint
const size_t count = m_stops.size();
SkAutoMalloc storage(count * (sizeof(SkColor) + sizeof(SkScalar)));
SkColor* colors = (SkColor*)storage.get();
SkScalar* pos = (SkScalar*)(colors + count);
Vector<ColorStop>::iterator iter = m_stops.begin();
for (int i = 0; iter != m_stops.end(); i++) {
pos[i] = SkFloatToScalar(iter->stop);
colors[i] = SkColorSetARGB(F2B(iter->alpha), F2B(iter->red),
F2B(iter->green), F2B(iter->blue));
++iter;
}
SkShader* s;
if (m_radial)
s = SkGradientShader::CreateTwoPointRadial(pts[0],
SkFloatToScalar(m_r0),
pts[1],
SkFloatToScalar(m_r1),
colors, pos, count, mode);
else
s = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
if (NULL == s)
s = new SkColorShader(0);
// zap our previous shader, if present
SkSafeUnref(m_gradient->m_shader);
m_gradient->m_shader = s;
m_gradient->m_tileMode = mode;
SkMatrix matrix = m_gradientSpaceTransformation;
s->setLocalMatrix(matrix);
return s;
}
void Gradient::fill(GraphicsContext* context, const FloatRect& rect)
{
SkRect r;
SkPaint paint;
// we don't care about the mode, so try to use the existing one
SkShader::TileMode mode = m_gradient ? m_gradient->m_tileMode :
SkShader::kClamp_TileMode;
paint.setAntiAlias(true);
paint.setShader(this->getShader(mode));
android_gc2canvas(context)->drawRect(rect, paint);
}
} //namespace
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