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/* libs/graphics/effects/SkLayerRasterizer.cpp
**
** 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 "SkLayerRasterizer.h"
#include "SkBuffer.h"
#include "SkDraw.h"
#include "SkMask.h"
#include "SkMaskFilter.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkXfermode.h"
#include <new>
struct SkLayerRasterizer_Rec {
SkPaint fPaint;
SkVector fOffset;
};
SkLayerRasterizer::SkLayerRasterizer() : fLayers(sizeof(SkLayerRasterizer_Rec))
{
}
SkLayerRasterizer::~SkLayerRasterizer()
{
SkDeque::Iter iter(fLayers);
SkLayerRasterizer_Rec* rec;
while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != NULL)
rec->fPaint.~SkPaint();
}
void SkLayerRasterizer::addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy)
{
SkLayerRasterizer_Rec* rec = (SkLayerRasterizer_Rec*)fLayers.push_back();
new (&rec->fPaint) SkPaint(paint);
rec->fOffset.set(dx, dy);
}
static bool compute_bounds(const SkDeque& layers, const SkPath& path, const SkMatrix& matrix,
const SkIRect* clipBounds, SkIRect* bounds)
{
SkDeque::Iter iter(layers);
SkLayerRasterizer_Rec* rec;
bounds->set(SK_MaxS32, SK_MaxS32, SK_MinS32, SK_MinS32);
while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != NULL)
{
const SkPaint& paint = rec->fPaint;
SkPath fillPath, devPath;
const SkPath* p = &path;
if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style)
{
paint.getFillPath(path, &fillPath);
p = &fillPath;
}
if (p->isEmpty())
continue;
// apply the matrix and offset
{
SkMatrix m = matrix;
m.preTranslate(rec->fOffset.fX, rec->fOffset.fY);
p->transform(m, &devPath);
}
SkMask mask;
if (!SkDraw::DrawToMask(devPath, clipBounds, paint.getMaskFilter(), &matrix,
&mask, SkMask::kJustComputeBounds_CreateMode))
return false;
bounds->join(mask.fBounds);
}
return true;
}
bool SkLayerRasterizer::onRasterize(const SkPath& path, const SkMatrix& matrix,
const SkIRect* clipBounds,
SkMask* mask, SkMask::CreateMode mode)
{
if (fLayers.empty())
return false;
if (SkMask::kJustRenderImage_CreateMode != mode)
{
if (!compute_bounds(fLayers, path, matrix, clipBounds, &mask->fBounds))
return false;
}
if (SkMask::kComputeBoundsAndRenderImage_CreateMode == mode)
{
mask->fFormat = SkMask::kA8_Format;
mask->fRowBytes = mask->fBounds.width();
mask->fImage = SkMask::AllocImage(mask->computeImageSize());
memset(mask->fImage, 0, mask->computeImageSize());
}
if (SkMask::kJustComputeBounds_CreateMode != mode)
{
SkBitmap device;
SkDraw draw;
SkMatrix translatedMatrix; // this translates us to our local pixels
SkMatrix drawMatrix; // this translates the path by each layer's offset
SkRegion rectClip;
rectClip.setRect(0, 0, mask->fBounds.width(), mask->fBounds.height());
translatedMatrix = matrix;
translatedMatrix.postTranslate(-SkIntToScalar(mask->fBounds.fLeft),
-SkIntToScalar(mask->fBounds.fTop));
device.setConfig(SkBitmap::kA8_Config, mask->fBounds.width(), mask->fBounds.height(), mask->fRowBytes);
device.setPixels(mask->fImage);
draw.fBitmap = &device;
draw.fMatrix = &drawMatrix;
draw.fClip = &rectClip;
// we set the matrixproc in the loop, as the matrix changes each time (potentially)
draw.fBounder = NULL;
SkDeque::Iter iter(fLayers);
SkLayerRasterizer_Rec* rec;
while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != NULL) {
drawMatrix = translatedMatrix;
drawMatrix.preTranslate(rec->fOffset.fX, rec->fOffset.fY);
draw.drawPath(path, rec->fPaint);
}
}
return true;
}
/////////// Routines for flattening /////////////////
static void paint_read(SkPaint* paint, SkFlattenableReadBuffer& buffer)
{
paint->setAntiAlias(buffer.readBool());
paint->setStyle((SkPaint::Style)buffer.readU8());
paint->setAlpha(buffer.readU8());
if (paint->getStyle() != SkPaint::kFill_Style)
{
paint->setStrokeWidth(buffer.readScalar());
paint->setStrokeMiter(buffer.readScalar());
paint->setStrokeCap((SkPaint::Cap)buffer.readU8());
paint->setStrokeJoin((SkPaint::Join)buffer.readU8());
}
paint->setMaskFilter((SkMaskFilter*)buffer.readFlattenable())->safeUnref();
paint->setPathEffect((SkPathEffect*)buffer.readFlattenable())->safeUnref();
paint->setRasterizer((SkRasterizer*)buffer.readFlattenable())->safeUnref();
paint->setXfermode((SkXfermode*)buffer.readFlattenable())->safeUnref();
}
static void paint_write(const SkPaint& paint, SkFlattenableWriteBuffer& buffer)
{
buffer.writeBool(paint.isAntiAlias());
buffer.write8(paint.getStyle());
buffer.write8(paint.getAlpha());
if (paint.getStyle() != SkPaint::kFill_Style)
{
buffer.writeScalar(paint.getStrokeWidth());
buffer.writeScalar(paint.getStrokeMiter());
buffer.write8(paint.getStrokeCap());
buffer.write8(paint.getStrokeJoin());
}
buffer.writeFlattenable(paint.getMaskFilter());
buffer.writeFlattenable(paint.getPathEffect());
buffer.writeFlattenable(paint.getRasterizer());
buffer.writeFlattenable(paint.getXfermode());
}
SkLayerRasterizer::SkLayerRasterizer(SkFlattenableReadBuffer& buffer)
: SkRasterizer(buffer), fLayers(sizeof(SkLayerRasterizer_Rec))
{
int count = buffer.readS32();
for (int i = 0; i < count; i++)
{
SkLayerRasterizer_Rec* rec = (SkLayerRasterizer_Rec*)fLayers.push_back();
#if 0
new (&rec->fPaint) SkPaint(buffer);
#else
new (&rec->fPaint) SkPaint;
paint_read(&rec->fPaint, buffer);
#endif
rec->fOffset.fX = buffer.readScalar();
rec->fOffset.fY = buffer.readScalar();
}
}
void SkLayerRasterizer::flatten(SkFlattenableWriteBuffer& buffer)
{
this->INHERITED::flatten(buffer);
buffer.write32(fLayers.count());
SkDeque::Iter iter(fLayers);
const SkLayerRasterizer_Rec* rec;
while ((rec = (const SkLayerRasterizer_Rec*)iter.next()) != NULL)
{
#if 0
rec->fPaint.flatten(buffer);
#else
paint_write(rec->fPaint, buffer);
#endif
buffer.writeScalar(rec->fOffset.fX);
buffer.writeScalar(rec->fOffset.fY);
}
}
SkFlattenable* SkLayerRasterizer::CreateProc(SkFlattenableReadBuffer& buffer)
{
return SkNEW_ARGS(SkLayerRasterizer, (buffer));
}
SkFlattenable::Factory SkLayerRasterizer::getFactory()
{
return CreateProc;
}
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