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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrShape.h"
GrShape& GrShape::operator=(const GrShape& that) {
bool wasPath = Type::kPath == fType;
fStyle = that.fStyle;
fType = that.fType;
switch (fType) {
case Type::kEmpty:
if (wasPath) {
fPath.reset();
}
break;
case Type::kRRect:
if (wasPath) {
fPath.reset();
}
fRRect = that.fRRect;
break;
case Type::kPath:
if (wasPath) {
*fPath.get() = *that.fPath.get();
} else {
fPath.set(*that.fPath.get());
}
break;
}
fInheritedKey.reset(that.fInheritedKey.count());
memcpy(fInheritedKey.get(), that.fInheritedKey.get(),
sizeof(uint32_t) * fInheritedKey.count());
return *this;
}
int GrShape::unstyledKeySize() const {
if (fInheritedKey.count()) {
return fInheritedKey.count();
}
switch (fType) {
case Type::kEmpty:
return 1;
case Type::kRRect:
SkASSERT(!fInheritedKey.count());
SkASSERT(0 == SkRRect::kSizeInMemory % sizeof(uint32_t));
return SkRRect::kSizeInMemory / sizeof(uint32_t);
case Type::kPath:
if (fPath.get()->isVolatile()) {
return -1;
} else {
return 1;
}
}
SkFAIL("Should never get here.");
return 0;
}
void GrShape::writeUnstyledKey(uint32_t* key) const {
SkASSERT(this->unstyledKeySize());
SkDEBUGCODE(uint32_t* origKey = key;)
if (fInheritedKey.count()) {
memcpy(key, fInheritedKey.get(), sizeof(uint32_t) * fInheritedKey.count());
SkDEBUGCODE(key += fInheritedKey.count();)
} else {
switch (fType) {
case Type::kEmpty:
*key++ = 1;
break;
case Type::kRRect:
fRRect.writeToMemory(key);
key += SkRRect::kSizeInMemory / sizeof(uint32_t);
break;
case Type::kPath:
SkASSERT(!fPath.get()->isVolatile());
*key++ = fPath.get()->getGenerationID();
break;
}
}
SkASSERT(key - origKey == this->unstyledKeySize());
}
int GrShape::StyleKeySize(const GrStyle& style, bool stopAfterPE) {
GR_STATIC_ASSERT(sizeof(uint32_t) == sizeof(SkScalar));
int size = 0;
if (style.isDashed()) {
// One scalar for dash phase and one for each dash value.
size += 1 + style.dashIntervalCnt();
} else if (style.pathEffect()) {
// No key for a generic path effect.
return -1;
}
if (stopAfterPE) {
return size;
}
if (style.strokeRec().needToApply()) {
// One for style/cap/join, 2 for miter and width.
size += 3;
}
return size;
}
void GrShape::StyleKey(uint32_t* key, const GrStyle& style, bool stopAfterPE) {
SkASSERT(key);
SkASSERT(StyleKeySize(style, stopAfterPE) >= 0);
GR_STATIC_ASSERT(sizeof(uint32_t) == sizeof(SkScalar));
int i = 0;
if (style.isDashed()) {
GR_STATIC_ASSERT(sizeof(style.dashPhase()) == sizeof(uint32_t));
SkScalar phase = style.dashPhase();
memcpy(&key[i++], &phase, sizeof(SkScalar));
int32_t count = style.dashIntervalCnt();
// Dash count should always be even.
SkASSERT(0 == (count & 0x1));
const SkScalar* intervals = style.dashIntervals();
int intervalByteCnt = count * sizeof(SkScalar);
memcpy(&key[i], intervals, intervalByteCnt);
SkDEBUGCODE(i += count);
} else {
SkASSERT(!style.pathEffect());
}
if (!stopAfterPE && style.strokeRec().needToApply()) {
enum {
kStyleBits = 2,
kJoinBits = 2,
kCapBits = 32 - kStyleBits - kJoinBits,
kJoinShift = kStyleBits,
kCapShift = kJoinShift + kJoinBits,
};
GR_STATIC_ASSERT(SkStrokeRec::kStyleCount <= (1 << kStyleBits));
GR_STATIC_ASSERT(SkPaint::kJoinCount <= (1 << kJoinBits));
GR_STATIC_ASSERT(SkPaint::kCapCount <= (1 << kCapBits));
key[i++] = style.strokeRec().getStyle() |
style.strokeRec().getJoin() << kJoinShift |
style.strokeRec().getCap() << kCapShift;
SkScalar scalar;
// Miter limit only affects miter joins
scalar = SkPaint::kMiter_Join == style.strokeRec().getJoin()
? style.strokeRec().getMiter()
: -1.f;
memcpy(&key[i++], &scalar, sizeof(scalar));
scalar = style.strokeRec().getWidth();
memcpy(&key[i++], &scalar, sizeof(scalar));
}
SkASSERT(StyleKeySize(style, stopAfterPE) == i);
}
void GrShape::setInheritedKey(const GrShape &parent, bool stopAfterPE){
SkASSERT(!fInheritedKey.count());
// If the output shape turns out to be simple, then we will just use its geometric key
if (Type::kPath == fType) {
// We want ApplyFullStyle(ApplyPathEffect(shape)) to have the same key as
// ApplyFullStyle(shape).
// The full key is structured as (geo,path_effect,stroke).
// If we do ApplyPathEffect we get get,path_effect as the inherited key. If we then
// do ApplyFullStyle we'll memcpy geo,path_effect into the new inherited key
// and then append the style key (which should now be stroke only) at the end.
int parentCnt = parent.fInheritedKey.count();
bool useParentGeoKey = !parentCnt;
if (useParentGeoKey) {
parentCnt = parent.unstyledKeySize();
}
int styleCnt = StyleKeySize(parent.fStyle, stopAfterPE);
if (styleCnt < 0) {
// The style doesn't allow a key, set the path to volatile so that we fail when
// we try to get a key for the shape.
fPath.get()->setIsVolatile(true);
} else {
fInheritedKey.reset(parentCnt + styleCnt);
if (useParentGeoKey) {
// This will be the geo key.
parent.writeUnstyledKey(fInheritedKey.get());
} else {
// This should be geo,path_effect
memcpy(fInheritedKey.get(), parent.fInheritedKey.get(),
parentCnt * sizeof(uint32_t));
}
// Now turn (geo,path_effect) or (geo) into (geo,path_effect,stroke)
StyleKey(fInheritedKey.get() + parentCnt, parent.fStyle, stopAfterPE);
}
}
}
GrShape::GrShape(const GrShape& that) : fType(that.fType), fStyle(that.fStyle) {
switch (fType) {
case Type::kEmpty:
return;
case Type::kRRect:
fRRect = that.fRRect;
return;
case Type::kPath:
fPath.set(*that.fPath.get());
return;
}
fInheritedKey.reset(that.fInheritedKey.count());
memcpy(fInheritedKey.get(), that.fInheritedKey.get(),
sizeof(uint32_t) * fInheritedKey.count());
}
GrShape::GrShape(const GrShape& parent, bool stopAfterPE) {
fType = Type::kEmpty;
SkPathEffect* pe = parent.fStyle.pathEffect();
const SkPath* inPath;
SkStrokeRec strokeRec = parent.fStyle.strokeRec();
if (pe) {
fType = Type::kPath;
fPath.init();
if (parent.fType == Type::kPath) {
inPath = parent.fPath.get();
} else {
inPath = fPath.get();
parent.asPath(fPath.get());
}
// Should we consider bounds? Would have to include in key, but it'd be nice to know
// if the bounds actually modified anything before including in key.
if (!pe->filterPath(fPath.get(), *inPath, &strokeRec, nullptr)) {
// Make an empty unstyled shape if filtering fails.
fType = Type::kEmpty;
fStyle = GrStyle();
fPath.reset();
return;
}
inPath = fPath.get();
} else if (stopAfterPE || !strokeRec.needToApply()) {
*this = parent;
return;
} else {
fType = Type::kPath;
fPath.init();
if (parent.fType == Type::kPath) {
inPath = parent.fPath.get();
} else {
inPath = fPath.get();
parent.asPath(fPath.get());
}
}
if (!stopAfterPE) {
strokeRec.applyToPath(fPath.get(), *inPath);
} else {
fStyle = GrStyle(strokeRec, nullptr);
}
this->setInheritedKey(parent, stopAfterPE);
}
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