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/*
*
* Copyright 2006, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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() { m_shader->safeUnref(); }
SkShader* m_shader;
SkShader::TileMode m_tileMode;
};
namespace WebCore {
void Gradient::platformDestroy()
{
delete m_gradient;
}
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 (m_gradient->m_tileMode == mode) {
return m_gradient->m_shader;
}
SkPoint pts[2];
android_setpt(&pts[0], m_p0);
android_setpt(&pts[1], m_p1);
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();
int i = -1;
while (i++, iter != m_stops.end()) {
pos[i] = SkFloatToScalar(iter->stop);
colors[i] = SkColorSetARGB(F2B(iter->alpha), F2B(iter->red),
F2B(iter->green), F2B(iter->blue));
++iter;
}
SkShader* s;
if (0 == count) {
// it seems the spec says a zero-size gradient draws transparent
s = new SkColorShader(0);
} else if (m_radial) {
s = SkGradientShader::CreateRadial(pts[0], SkFloatToScalar(m_r0),
colors, pos, count, mode);
} else {
s = SkGradientShader::CreateLinear(pts, colors, pos, count, mode);
}
m_gradient->m_shader->safeUnref();
m_gradient->m_shader = s;
m_gradient->m_tileMode = mode;
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(*android_setrect(&r, rect), paint);
}
} //namespace
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