| /* |
| * 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 "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; |
| } |
| |
| 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.endRecording(); |
| } |
| |
| SkPicture* SkPicture::CreateFromStream(SkStream* stream, InstallPixelRefProc proc) { |
| return CreateFromStream(stream, proc, nullptr); |
| } |
| |
| SkPicture* SkPicture::CreateFromStream(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); |
| } |
| |
| SkPicture* SkPicture::CreateFromBuffer(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; |
| } |