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/*
* Copyright (C) 2010 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 "SkPDFGraphicState.h"
#include "SkStream.h"
SkPDFGraphicState::~SkPDFGraphicState() {
SkAutoMutexAcquire lock(canonicalPaintsMutex());
int index = find(fPaint);
SkASSERT(index >= 0);
canonicalPaints().removeShuffle(index);
}
void SkPDFGraphicState::emitObject(SkWStream* stream, SkPDFCatalog* catalog,
bool indirect) {
populateDict();
SkPDFDict::emitObject(stream, catalog, indirect);
}
size_t SkPDFGraphicState::getOutputSize(SkPDFCatalog* catalog, bool indirect) {
populateDict();
return SkPDFDict::getOutputSize(catalog, indirect);
}
// static
SkTDArray<SkPDFGraphicState::GSCanonicalEntry>&
SkPDFGraphicState::canonicalPaints() {
// This initialization is only thread safe with gcc.
static SkTDArray<SkPDFGraphicState::GSCanonicalEntry> gCanonicalPaints;
return gCanonicalPaints;
}
// static
SkMutex& SkPDFGraphicState::canonicalPaintsMutex() {
// This initialization is only thread safe with gcc.
static SkMutex gCanonicalPaintsMutex;
return gCanonicalPaintsMutex;
}
// static
SkPDFGraphicState* SkPDFGraphicState::getGraphicStateForPaint(
const SkPaint& paint) {
SkAutoMutexAcquire lock(canonicalPaintsMutex());
int index = find(paint);
if (index >= 0) {
canonicalPaints()[index].fGraphicState->ref();
return canonicalPaints()[index].fGraphicState;
}
GSCanonicalEntry newEntry(new SkPDFGraphicState(paint));
canonicalPaints().push(newEntry);
return newEntry.fGraphicState;
}
// static
int SkPDFGraphicState::find(const SkPaint& paint) {
GSCanonicalEntry search(&paint);
return canonicalPaints().find(search);
}
SkPDFGraphicState::SkPDFGraphicState(const SkPaint& paint)
: fPaint(paint),
fPopulated(false) {
}
// populateDict and operator== have to stay in sync with each other.
void SkPDFGraphicState::populateDict() {
if (!fPopulated) {
fPopulated = true;
SkRefPtr<SkPDFName> typeName = new SkPDFName("ExtGState");
typeName->unref(); // SkRefPtr and new both took a reference.
insert("Type", typeName.get());
SkScalar maxAlpha = SkIntToScalar(0xFF);
SkRefPtr<SkPDFScalar> alpha =
new SkPDFScalar(SkColorGetA(fPaint.getColor())/maxAlpha);
alpha->unref(); // SkRefPtr and new both took a reference.
insert("CA", alpha.get());
insert("ca", alpha.get());
SkASSERT(SkPaint::kButt_Cap == 0);
SkASSERT(SkPaint::kRound_Cap == 1);
SkASSERT(SkPaint::kSquare_Cap == 2);
SkASSERT(fPaint.getStrokeCap() >= 0 && fPaint.getStrokeCap() <= 2);
SkRefPtr<SkPDFInt> strokeCap = new SkPDFInt(fPaint.getStrokeCap());
strokeCap->unref(); // SkRefPtr and new both took a reference.
insert("LC", strokeCap.get());
SkASSERT(SkPaint::kMiter_Join == 0);
SkASSERT(SkPaint::kRound_Join == 1);
SkASSERT(SkPaint::kBevel_Join == 2);
SkASSERT(fPaint.getStrokeJoin() >= 0 && fPaint.getStrokeJoin() <= 2);
SkRefPtr<SkPDFInt> strokeJoin = new SkPDFInt(fPaint.getStrokeJoin());
strokeJoin->unref(); // SkRefPtr and new both took a reference.
insert("LJ", strokeJoin.get());
SkRefPtr<SkPDFScalar> strokeWidth =
new SkPDFScalar(fPaint.getStrokeWidth());
strokeWidth->unref(); // SkRefPtr and new both took a reference.
insert("LW", strokeWidth.get());
SkRefPtr<SkPDFScalar> strokeMiterLimit = new SkPDFScalar(
fPaint.getStrokeMiter());
strokeMiterLimit->unref(); // SkRefPtr and new both took a reference.
insert("ML", strokeWidth.get());
// Turn on automatic stroke adjustment.
SkRefPtr<SkPDFBool> trueVal = new SkPDFBool(true);
trueVal->unref(); // SkRefPtr and new both took a reference.
insert("SA", trueVal.get());
}
}
// We're only interested in some fields of the SkPaint, so we have a custom
// operator== function.
bool SkPDFGraphicState::GSCanonicalEntry::operator==(
const SkPDFGraphicState::GSCanonicalEntry& gs) const {
const SkPaint* a = fPaint;
const SkPaint* b = gs.fPaint;
SkASSERT(a != NULL);
SkASSERT(b != NULL);
return SkColorGetA(a->getColor()) == SkColorGetA(b->getColor()) &&
a->getStrokeCap() == b->getStrokeCap() &&
a->getStrokeJoin() == b->getStrokeJoin() &&
a->getStrokeWidth() == b->getStrokeWidth() &&
a->getStrokeMiter() == b->getStrokeMiter();
}
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