/*
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* Copyright 2007 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkPicture.h"
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#include "SkImageGenerator.h"
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#include "SkMathPriv.h"
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#include "SkPictureCommon.h"
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#include "SkPictureData.h"
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#include "SkPicturePlayback.h"
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#include "SkPicturePriv.h"
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#include "SkPictureRecord.h"
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#include "SkPictureRecorder.h"
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#include "SkSerialProcs.h"
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#include "SkTo.h"
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#include <atomic>
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// When we read/write the SkPictInfo via a stream, we have a sentinel byte right after the info.
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// Note: in the read/write buffer versions, we have a slightly different convention:
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// We have a sentinel int32_t:
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// 0 : failure
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// 1 : PictureData
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// <0 : -size of the custom data
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enum {
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kFailure_TrailingStreamByteAfterPictInfo = 0, // nothing follows
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kPictureData_TrailingStreamByteAfterPictInfo = 1, // SkPictureData follows
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kCustom_TrailingStreamByteAfterPictInfo = 2, // -size32 follows
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};
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/* SkPicture impl. This handles generic responsibilities like unique IDs and serialization. */
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SkPicture::SkPicture() {
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static std::atomic<uint32_t> nextID{1};
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do {
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fUniqueID = nextID.fetch_add(+1, std::memory_order_relaxed);
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} while (fUniqueID == 0);
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}
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static const char kMagic[] = { 's', 'k', 'i', 'a', 'p', 'i', 'c', 't' };
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SkPictInfo SkPicture::createHeader() const {
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SkPictInfo info;
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// Copy magic bytes at the beginning of the header
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static_assert(sizeof(kMagic) == 8, "");
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static_assert(sizeof(kMagic) == sizeof(info.fMagic), "");
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memcpy(info.fMagic, kMagic, sizeof(kMagic));
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// Set picture info after magic bytes in the header
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info.setVersion(CURRENT_PICTURE_VERSION);
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info.fCullRect = this->cullRect();
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return info;
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}
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bool SkPicture::IsValidPictInfo(const SkPictInfo& info) {
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if (0 != memcmp(info.fMagic, kMagic, sizeof(kMagic))) {
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return false;
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}
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if (info.getVersion() < MIN_PICTURE_VERSION || info.getVersion() > CURRENT_PICTURE_VERSION) {
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return false;
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}
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return true;
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}
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bool SkPicture::StreamIsSKP(SkStream* stream, SkPictInfo* pInfo) {
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if (!stream) {
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return false;
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}
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SkPictInfo info;
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SkASSERT(sizeof(kMagic) == sizeof(info.fMagic));
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if (stream->read(&info.fMagic, sizeof(kMagic)) != sizeof(kMagic)) {
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return false;
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}
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uint32_t version;
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if (!stream->readU32(&version)) { return false; }
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info.setVersion(version);
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if (!stream->readScalar(&info.fCullRect.fLeft )) { return false; }
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if (!stream->readScalar(&info.fCullRect.fTop )) { return false; }
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if (!stream->readScalar(&info.fCullRect.fRight )) { return false; }
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if (!stream->readScalar(&info.fCullRect.fBottom)) { return false; }
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if (info.getVersion() < SkReadBuffer::kRemoveHeaderFlags_Version) {
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if (!stream->readU32(nullptr)) { return false; }
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}
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if (!IsValidPictInfo(info)) { return false; }
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if (pInfo) { *pInfo = info; }
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return true;
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}
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bool SkPicture_StreamIsSKP(SkStream* stream, SkPictInfo* pInfo) {
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return SkPicture::StreamIsSKP(stream, pInfo);
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}
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bool SkPicture::BufferIsSKP(SkReadBuffer* buffer, SkPictInfo* pInfo) {
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SkPictInfo info;
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SkASSERT(sizeof(kMagic) == sizeof(info.fMagic));
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if (!buffer->readByteArray(&info.fMagic, sizeof(kMagic))) {
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return false;
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}
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info.setVersion(buffer->readUInt());
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buffer->readRect(&info.fCullRect);
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if (info.getVersion() < SkReadBuffer::kRemoveHeaderFlags_Version) {
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(void)buffer->readUInt(); // used to be flags
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}
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if (IsValidPictInfo(info)) {
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if (pInfo) { *pInfo = info; }
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return true;
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}
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return false;
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}
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sk_sp<SkPicture> SkPicture::Forwardport(const SkPictInfo& info,
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const SkPictureData* data,
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SkReadBuffer* buffer) {
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if (!data) {
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return nullptr;
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}
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if (!data->opData()) {
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return nullptr;
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}
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SkPicturePlayback playback(data);
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SkPictureRecorder r;
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playback.draw(r.beginRecording(info.fCullRect), nullptr/*no callback*/, buffer);
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return r.finishRecordingAsPicture();
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}
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sk_sp<SkPicture> SkPicture::MakeFromStream(SkStream* stream, const SkDeserialProcs* procs) {
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return MakeFromStream(stream, procs, nullptr);
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}
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sk_sp<SkPicture> SkPicture::MakeFromData(const void* data, size_t size,
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const SkDeserialProcs* procs) {
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if (!data) {
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return nullptr;
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}
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SkMemoryStream stream(data, size);
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return MakeFromStream(&stream, procs, nullptr);
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}
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sk_sp<SkPicture> SkPicture::MakeFromData(const SkData* data, const SkDeserialProcs* procs) {
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if (!data) {
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return nullptr;
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}
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SkMemoryStream stream(data->data(), data->size());
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return MakeFromStream(&stream, procs, nullptr);
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}
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sk_sp<SkPicture> SkPicture::MakeFromStream(SkStream* stream, const SkDeserialProcs* procsPtr,
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SkTypefacePlayback* typefaces) {
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SkPictInfo info;
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if (!StreamIsSKP(stream, &info)) {
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return nullptr;
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}
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SkDeserialProcs procs;
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if (procsPtr) {
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procs = *procsPtr;
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}
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uint8_t trailingStreamByteAfterPictInfo;
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if (!stream->readU8(&trailingStreamByteAfterPictInfo)) { return nullptr; }
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switch (trailingStreamByteAfterPictInfo) {
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case kPictureData_TrailingStreamByteAfterPictInfo: {
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std::unique_ptr<SkPictureData> data(
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SkPictureData::CreateFromStream(stream, info, procs, typefaces));
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return Forwardport(info, data.get(), nullptr);
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}
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case kCustom_TrailingStreamByteAfterPictInfo: {
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int32_t ssize;
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if (!stream->readS32(&ssize) || ssize >= 0 || !procs.fPictureProc) {
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return nullptr;
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}
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size_t size = sk_negate_to_size_t(ssize);
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auto data = SkData::MakeUninitialized(size);
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if (stream->read(data->writable_data(), size) != size) {
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return nullptr;
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}
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return procs.fPictureProc(data->data(), size, procs.fPictureCtx);
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}
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default: // fall through to error return
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break;
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}
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return nullptr;
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}
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sk_sp<SkPicture> SkPicturePriv::MakeFromBuffer(SkReadBuffer& buffer) {
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SkPictInfo info;
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if (!SkPicture::BufferIsSKP(&buffer, &info)) {
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return nullptr;
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}
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// size should be 0, 1, or negative
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int32_t ssize = buffer.read32();
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if (ssize < 0) {
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const SkDeserialProcs& procs = buffer.getDeserialProcs();
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if (!procs.fPictureProc) {
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return nullptr;
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}
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size_t size = sk_negate_to_size_t(ssize);
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return procs.fPictureProc(buffer.skip(size), size, procs.fPictureCtx);
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}
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if (ssize != 1) {
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// 1 is the magic 'size' that means SkPictureData follows
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return nullptr;
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}
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std::unique_ptr<SkPictureData> data(SkPictureData::CreateFromBuffer(buffer, info));
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return SkPicture::Forwardport(info, data.get(), &buffer);
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}
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SkPictureData* SkPicture::backport() const {
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SkPictInfo info = this->createHeader();
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SkPictureRecord rec(SkISize::Make(info.fCullRect.width(), info.fCullRect.height()), 0/*flags*/);
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rec.beginRecording();
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this->playback(&rec);
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rec.endRecording();
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return new SkPictureData(rec, info);
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}
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void SkPicture::serialize(SkWStream* stream, const SkSerialProcs* procs) const {
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this->serialize(stream, procs, nullptr);
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}
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sk_sp<SkData> SkPicture::serialize(const SkSerialProcs* procs) const {
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SkDynamicMemoryWStream stream;
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this->serialize(&stream, procs, nullptr);
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return stream.detachAsData();
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}
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static sk_sp<SkData> custom_serialize(const SkPicture* picture, const SkSerialProcs& procs) {
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if (procs.fPictureProc) {
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auto data = procs.fPictureProc(const_cast<SkPicture*>(picture), procs.fPictureCtx);
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if (data) {
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size_t size = data->size();
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if (!SkTFitsIn<int32_t>(size) || size <= 1) {
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return SkData::MakeEmpty();
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}
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return data;
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}
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}
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return nullptr;
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}
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static bool write_pad32(SkWStream* stream, const void* data, size_t size) {
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if (!stream->write(data, size)) {
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return false;
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}
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if (size & 3) {
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uint32_t zero = 0;
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return stream->write(&zero, 4 - (size & 3));
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}
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return true;
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}
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void SkPicture::serialize(SkWStream* stream, const SkSerialProcs* procsPtr,
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SkRefCntSet* typefaceSet) const {
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SkSerialProcs procs;
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if (procsPtr) {
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procs = *procsPtr;
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}
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SkPictInfo info = this->createHeader();
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stream->write(&info, sizeof(info));
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if (auto custom = custom_serialize(this, procs)) {
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int32_t size = SkToS32(custom->size());
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if (size == 0) {
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stream->write8(kFailure_TrailingStreamByteAfterPictInfo);
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return;
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}
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stream->write8(kCustom_TrailingStreamByteAfterPictInfo);
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stream->write32(-size); // negative for custom format
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write_pad32(stream, custom->data(), size);
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return;
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}
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std::unique_ptr<SkPictureData> data(this->backport());
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if (data) {
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stream->write8(kPictureData_TrailingStreamByteAfterPictInfo);
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data->serialize(stream, procs, typefaceSet);
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} else {
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stream->write8(kFailure_TrailingStreamByteAfterPictInfo);
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}
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}
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void SkPicturePriv::Flatten(const sk_sp<const SkPicture> picture, SkWriteBuffer& buffer) {
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SkPictInfo info = picture->createHeader();
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std::unique_ptr<SkPictureData> data(picture->backport());
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buffer.writeByteArray(&info.fMagic, sizeof(info.fMagic));
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buffer.writeUInt(info.getVersion());
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buffer.writeRect(info.fCullRect);
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if (auto custom = custom_serialize(picture.get(), buffer.fProcs)) {
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int32_t size = SkToS32(custom->size());
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buffer.write32(-size); // negative for custom format
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buffer.writePad32(custom->data(), size);
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return;
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}
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if (data) {
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buffer.write32(1); // special size meaning SkPictureData
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data->flatten(buffer);
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} else {
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buffer.write32(0); // signal no content
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}
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}
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sk_sp<SkPicture> SkPicture::MakePlaceholder(SkRect cull) {
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struct Placeholder : public SkPicture {
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explicit Placeholder(SkRect cull) : fCull(cull) {}
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void playback(SkCanvas*, AbortCallback*) const override { }
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// approximateOpCount() needs to be greater than kMaxPictureOpsToUnrollInsteadOfRef
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// in SkCanvas.cpp to avoid that unrolling. SK_MaxS32 can't not be big enough!
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int approximateOpCount() const override { return SK_MaxS32; }
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size_t approximateBytesUsed() const override { return sizeof(*this); }
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SkRect cullRect() const override { return fCull; }
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SkRect fCull;
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};
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return sk_make_sp<Placeholder>(cull);
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}
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