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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkLayerRasterizer.h"
#include "SkDraw.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkMask.h"
#include "SkMaskFilter.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkPathEffect.h"
#include "../core/SkRasterClip.h"
#include "../core/SkStrokeRec.h"
#include <new>
struct SkLayerRasterizer_Rec {
SkPaint fPaint;
SkVector fOffset;
};
SkLayerRasterizer::SkLayerRasterizer() : fLayers(new SkDeque(sizeof(SkLayerRasterizer_Rec))) {}
SkLayerRasterizer::SkLayerRasterizer(SkDeque* layers) : fLayers(layers)
{
}
// Helper function to call destructors on SkPaints held by layers and delete layers.
static void clean_up_layers(SkDeque* layers) {
SkDeque::F2BIter iter(*layers);
SkLayerRasterizer_Rec* rec;
while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != nullptr)
rec->fPaint.~SkPaint();
delete layers;
}
SkLayerRasterizer::~SkLayerRasterizer() {
SkASSERT(fLayers);
clean_up_layers(const_cast<SkDeque*>(fLayers));
}
static bool compute_bounds(const SkDeque& layers, const SkPath& path,
const SkMatrix& matrix,
const SkIRect* clipBounds, SkIRect* bounds) {
SkDeque::F2BIter iter(layers);
SkLayerRasterizer_Rec* rec;
bounds->set(SK_MaxS32, SK_MaxS32, SK_MinS32, SK_MinS32);
while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != nullptr) {
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,
SkStrokeRec::kFill_InitStyle)) {
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) const {
SkASSERT(fLayers);
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();
size_t size = mask->computeImageSize();
if (0 == size) {
return false; // too big to allocate, abort
}
mask->fImage = SkMask::AllocImage(size);
memset(mask->fImage, 0, size);
}
if (SkMask::kJustComputeBounds_CreateMode != mode) {
SkDraw draw;
if (!draw.fDst.reset(*mask)) {
return false;
}
SkRasterClip rectClip;
SkMatrix translatedMatrix; // this translates us to our local pixels
SkMatrix drawMatrix; // this translates the path by each layer's offset
rectClip.setRect(SkIRect::MakeWH(mask->fBounds.width(), mask->fBounds.height()));
translatedMatrix = matrix;
translatedMatrix.postTranslate(-SkIntToScalar(mask->fBounds.fLeft),
-SkIntToScalar(mask->fBounds.fTop));
draw.fMatrix = &drawMatrix;
draw.fRC = &rectClip;
// we set the matrixproc in the loop, as the matrix changes each time (potentially)
SkDeque::F2BIter iter(*fLayers);
SkLayerRasterizer_Rec* rec;
while ((rec = (SkLayerRasterizer_Rec*)iter.next()) != nullptr) {
drawMatrix = translatedMatrix;
drawMatrix.preTranslate(rec->fOffset.fX, rec->fOffset.fY);
draw.drawPath(path, rec->fPaint);
}
}
return true;
}
sk_sp<SkFlattenable> SkLayerRasterizer::CreateProc(SkReadBuffer& buffer) {
return sk_sp<SkFlattenable>(new SkLayerRasterizer(ReadLayers(buffer)));
}
SkDeque* SkLayerRasterizer::ReadLayers(SkReadBuffer& buffer) {
int count = buffer.readInt();
SkDeque* layers = new SkDeque(sizeof(SkLayerRasterizer_Rec));
for (int i = 0; i < count; i++) {
SkLayerRasterizer_Rec* rec = (SkLayerRasterizer_Rec*)layers->push_back();
new (&rec->fPaint) SkPaint;
buffer.readPaint(&rec->fPaint);
buffer.readPoint(&rec->fOffset);
}
return layers;
}
void SkLayerRasterizer::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
SkASSERT(fLayers);
buffer.writeInt(fLayers->count());
SkDeque::F2BIter iter(*fLayers);
const SkLayerRasterizer_Rec* rec;
while ((rec = (const SkLayerRasterizer_Rec*)iter.next()) != nullptr) {
buffer.writePaint(rec->fPaint);
buffer.writePoint(rec->fOffset);
}
}
SkLayerRasterizer::Builder::Builder() : fLayers(new SkDeque(sizeof(SkLayerRasterizer_Rec))) {}
SkLayerRasterizer::Builder::~Builder()
{
if (fLayers != nullptr) {
clean_up_layers(fLayers);
}
}
void SkLayerRasterizer::Builder::addLayer(const SkPaint& paint, SkScalar dx,
SkScalar dy) {
SkASSERT(fLayers);
SkLayerRasterizer_Rec* rec = (SkLayerRasterizer_Rec*)fLayers->push_back();
new (&rec->fPaint) SkPaint(paint);
rec->fOffset.set(dx, dy);
}
sk_sp<SkLayerRasterizer> SkLayerRasterizer::Builder::detach() {
SkLayerRasterizer* rasterizer;
if (0 == fLayers->count()) {
rasterizer = nullptr;
delete fLayers;
} else {
rasterizer = new SkLayerRasterizer(fLayers);
}
fLayers = nullptr;
return sk_sp<SkLayerRasterizer>(rasterizer);
}
sk_sp<SkLayerRasterizer> SkLayerRasterizer::Builder::snapshot() const {
if (0 == fLayers->count()) {
return nullptr;
}
SkDeque* layers = new SkDeque(sizeof(SkLayerRasterizer_Rec), fLayers->count());
SkDeque::F2BIter iter(*fLayers);
const SkLayerRasterizer_Rec* recOrig;
SkDEBUGCODE(int count = 0;)
while ((recOrig = static_cast<SkLayerRasterizer_Rec*>(iter.next())) != nullptr) {
SkDEBUGCODE(count++);
SkLayerRasterizer_Rec* recCopy = static_cast<SkLayerRasterizer_Rec*>(layers->push_back());
new (&recCopy->fPaint) SkPaint(recOrig->fPaint);
recCopy->fOffset = recOrig->fOffset;
}
SkASSERT(fLayers->count() == count);
SkASSERT(layers->count() == count);
return sk_sp<SkLayerRasterizer>(new SkLayerRasterizer(layers));
}
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