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/*
* Copyright 2007 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 "SkAtomics.h"
#include "SkImageGenerator.h"
#include "SkMessageBus.h"
#include "SkPicture.h"
#include "SkPictureData.h"
#include "SkPicturePlayback.h"
#include "SkPictureRecord.h"
#include "SkPictureRecorder.h"
#if defined(SK_DISALLOW_CROSSPROCESS_PICTUREIMAGEFILTERS) || \
defined(SK_ENABLE_PICTURE_IO_SECURITY_PRECAUTIONS)
static bool g_AllPictureIOSecurityPrecautionsEnabled = true;
#else
static bool g_AllPictureIOSecurityPrecautionsEnabled = false;
#endif
DECLARE_SKMESSAGEBUS_MESSAGE(SkPicture::DeletionMessage);
/* SkPicture impl. This handles generic responsibilities like unique IDs and serialization. */
SkPicture::SkPicture() : fUniqueID(0) {}
SkPicture::~SkPicture() {
// TODO: move this to ~SkBigPicture() only?
// If the ID is still zero, no one has read it, so no need to send this message.
uint32_t id = sk_atomic_load(&fUniqueID, sk_memory_order_relaxed);
if (id != 0) {
SkPicture::DeletionMessage msg = { (int32_t)id };
SkMessageBus<SkPicture::DeletionMessage>::Post(msg);
}
}
uint32_t SkPicture::uniqueID() const {
static uint32_t gNextID = 1;
uint32_t id = sk_atomic_load(&fUniqueID, sk_memory_order_relaxed);
while (id == 0) {
uint32_t next = sk_atomic_fetch_add(&gNextID, 1u);
if (sk_atomic_compare_exchange(&fUniqueID, &id, next,
sk_memory_order_relaxed,
sk_memory_order_relaxed)) {
id = next;
} else {
// sk_atomic_compare_exchange replaced id with the current value of fUniqueID.
}
}
return id;
}
static const char kMagic[] = { 's', 'k', 'i', 'a', 'p', 'i', 'c', 't' };
SkPictInfo SkPicture::createHeader() const {
SkPictInfo info;
// Copy magic bytes at the beginning of the header
static_assert(sizeof(kMagic) == 8, "");
static_assert(sizeof(kMagic) == sizeof(info.fMagic), "");
memcpy(info.fMagic, kMagic, sizeof(kMagic));
// Set picture info after magic bytes in the header
info.fVersion = CURRENT_PICTURE_VERSION;
info.fCullRect = this->cullRect();
info.fFlags = SkPictInfo::kCrossProcess_Flag;
// TODO: remove this flag, since we're always float (now)
info.fFlags |= SkPictInfo::kScalarIsFloat_Flag;
if (8 == sizeof(void*)) {
info.fFlags |= SkPictInfo::kPtrIs64Bit_Flag;
}
return info;
}
bool SkPicture::IsValidPictInfo(const SkPictInfo& info) {
if (0 != memcmp(info.fMagic, kMagic, sizeof(kMagic))) {
return false;
}
if (info.fVersion < MIN_PICTURE_VERSION || info.fVersion > CURRENT_PICTURE_VERSION) {
return false;
}
return true;
}
bool SkPicture::InternalOnly_StreamIsSKP(SkStream* stream, SkPictInfo* pInfo) {
if (!stream) {
return false;
}
SkPictInfo info;
SkASSERT(sizeof(kMagic) == sizeof(info.fMagic));
if (!stream->read(&info.fMagic, sizeof(kMagic))) {
return false;
}
info.fVersion = stream->readU32();
info.fCullRect.fLeft = stream->readScalar();
info.fCullRect.fTop = stream->readScalar();
info.fCullRect.fRight = stream->readScalar();
info.fCullRect.fBottom = stream->readScalar();
info.fFlags = stream->readU32();
if (IsValidPictInfo(info)) {
if (pInfo) { *pInfo = info; }
return true;
}
return false;
}
bool SkPicture::InternalOnly_BufferIsSKP(SkReadBuffer* buffer, SkPictInfo* pInfo) {
SkPictInfo info;
SkASSERT(sizeof(kMagic) == sizeof(info.fMagic));
if (!buffer->readByteArray(&info.fMagic, sizeof(kMagic))) {
return false;
}
info.fVersion = buffer->readUInt();
buffer->readRect(&info.fCullRect);
info.fFlags = buffer->readUInt();
if (IsValidPictInfo(info)) {
if (pInfo) { *pInfo = info; }
return true;
}
return false;
}
sk_sp<SkPicture> SkPicture::Forwardport(const SkPictInfo& info, const SkPictureData* data) {
if (!data) {
return nullptr;
}
SkPicturePlayback playback(data);
SkPictureRecorder r;
playback.draw(r.beginRecording(info.fCullRect), nullptr/*no callback*/);
return r.finishRecordingAsPicture();
}
static bool default_install(const void* src, size_t length, SkBitmap* dst) {
sk_sp<SkData> encoded(SkData::MakeWithCopy(src, length));
return encoded && SkDEPRECATED_InstallDiscardablePixelRef(
SkImageGenerator::NewFromEncoded(encoded.get()), dst);
}
sk_sp<SkPicture> SkPicture::MakeFromStream(SkStream* stream) {
return MakeFromStream(stream, &default_install, nullptr);
}
sk_sp<SkPicture> SkPicture::MakeFromStream(SkStream* stream, InstallPixelRefProc proc) {
return MakeFromStream(stream, proc, nullptr);
}
sk_sp<SkPicture> SkPicture::MakeFromStream(SkStream* stream, InstallPixelRefProc proc,
SkTypefacePlayback* typefaces) {
SkPictInfo info;
if (!InternalOnly_StreamIsSKP(stream, &info) || !stream->readBool()) {
return nullptr;
}
SkAutoTDelete<SkPictureData> data(
SkPictureData::CreateFromStream(stream, info, proc, typefaces));
return Forwardport(info, data);
}
sk_sp<SkPicture> SkPicture::MakeFromBuffer(SkReadBuffer& buffer) {
SkPictInfo info;
if (!InternalOnly_BufferIsSKP(&buffer, &info) || !buffer.readBool()) {
return nullptr;
}
SkAutoTDelete<SkPictureData> data(SkPictureData::CreateFromBuffer(buffer, info));
return Forwardport(info, data);
}
SkPictureData* SkPicture::backport() const {
SkPictInfo info = this->createHeader();
SkPictureRecord rec(SkISize::Make(info.fCullRect.width(), info.fCullRect.height()), 0/*flags*/);
rec.beginRecording();
this->playback(&rec);
rec.endRecording();
return new SkPictureData(rec, info, false /*deep copy ops?*/);
}
void SkPicture::serialize(SkWStream* stream, SkPixelSerializer* pixelSerializer) const {
this->serialize(stream, pixelSerializer, nullptr);
}
void SkPicture::serialize(SkWStream* stream,
SkPixelSerializer* pixelSerializer,
SkRefCntSet* typefaceSet) const {
SkPictInfo info = this->createHeader();
SkAutoTDelete<SkPictureData> data(this->backport());
stream->write(&info, sizeof(info));
if (data) {
stream->writeBool(true);
data->serialize(stream, pixelSerializer, typefaceSet);
} else {
stream->writeBool(false);
}
}
void SkPicture::flatten(SkWriteBuffer& buffer) const {
SkPictInfo info = this->createHeader();
SkAutoTDelete<SkPictureData> data(this->backport());
buffer.writeByteArray(&info.fMagic, sizeof(info.fMagic));
buffer.writeUInt(info.fVersion);
buffer.writeRect(info.fCullRect);
buffer.writeUInt(info.fFlags);
if (data) {
buffer.writeBool(true);
data->flatten(buffer);
} else {
buffer.writeBool(false);
}
}
bool SkPicture::suitableForGpuRasterization(GrContext*, const char** whyNot) const {
if (this->numSlowPaths() > 5) {
if (whyNot) { *whyNot = "Too many slow paths (either concave or dashed)."; }
return false;
}
return true;
}
// Global setting to disable security precautions for serialization.
void SkPicture::SetPictureIOSecurityPrecautionsEnabled_Dangerous(bool set) {
g_AllPictureIOSecurityPrecautionsEnabled = set;
}
bool SkPicture::PictureIOSecurityPrecautionsEnabled() {
return g_AllPictureIOSecurityPrecautionsEnabled;
}
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