123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782783784785786787788789790791792793794795796797 |
- /*
- * 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 "include/codec/SkCodec.h"
- #include "include/core/SkData.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkStream.h"
- #include "include/core/SkTypes.h"
- #include "include/private/SkColorData.h"
- #include "include/private/SkMutex.h"
- #include "include/private/SkTArray.h"
- #include "include/private/SkTemplates.h"
- #include "src/codec/SkCodecPriv.h"
- #include "src/codec/SkJpegCodec.h"
- #include "src/codec/SkRawCodec.h"
- #include "src/core/SkColorSpacePriv.h"
- #include "src/core/SkMakeUnique.h"
- #include "src/core/SkStreamPriv.h"
- #include "src/core/SkTaskGroup.h"
- #include "dng_area_task.h"
- #include "dng_color_space.h"
- #include "dng_errors.h"
- #include "dng_exceptions.h"
- #include "dng_host.h"
- #include "dng_info.h"
- #include "dng_memory.h"
- #include "dng_render.h"
- #include "dng_stream.h"
- #include "src/piex.h"
- #include <cmath> // for std::round,floor,ceil
- #include <limits>
- namespace {
- // Caluclates the number of tiles of tile_size that fit into the area in vertical and horizontal
- // directions.
- dng_point num_tiles_in_area(const dng_point &areaSize,
- const dng_point_real64 &tileSize) {
- // FIXME: Add a ceil_div() helper in SkCodecPriv.h
- return dng_point(static_cast<int32>((areaSize.v + tileSize.v - 1) / tileSize.v),
- static_cast<int32>((areaSize.h + tileSize.h - 1) / tileSize.h));
- }
- int num_tasks_required(const dng_point& tilesInTask,
- const dng_point& tilesInArea) {
- return ((tilesInArea.v + tilesInTask.v - 1) / tilesInTask.v) *
- ((tilesInArea.h + tilesInTask.h - 1) / tilesInTask.h);
- }
- // Calculate the number of tiles to process per task, taking into account the maximum number of
- // tasks. It prefers to increase horizontally for better locality of reference.
- dng_point num_tiles_per_task(const int maxTasks,
- const dng_point &tilesInArea) {
- dng_point tilesInTask = {1, 1};
- while (num_tasks_required(tilesInTask, tilesInArea) > maxTasks) {
- if (tilesInTask.h < tilesInArea.h) {
- ++tilesInTask.h;
- } else if (tilesInTask.v < tilesInArea.v) {
- ++tilesInTask.v;
- } else {
- ThrowProgramError("num_tiles_per_task calculation is wrong.");
- }
- }
- return tilesInTask;
- }
- std::vector<dng_rect> compute_task_areas(const int maxTasks, const dng_rect& area,
- const dng_point& tileSize) {
- std::vector<dng_rect> taskAreas;
- const dng_point tilesInArea = num_tiles_in_area(area.Size(), tileSize);
- const dng_point tilesPerTask = num_tiles_per_task(maxTasks, tilesInArea);
- const dng_point taskAreaSize = {tilesPerTask.v * tileSize.v,
- tilesPerTask.h * tileSize.h};
- for (int v = 0; v < tilesInArea.v; v += tilesPerTask.v) {
- for (int h = 0; h < tilesInArea.h; h += tilesPerTask.h) {
- dng_rect taskArea;
- taskArea.t = area.t + v * tileSize.v;
- taskArea.l = area.l + h * tileSize.h;
- taskArea.b = Min_int32(taskArea.t + taskAreaSize.v, area.b);
- taskArea.r = Min_int32(taskArea.l + taskAreaSize.h, area.r);
- taskAreas.push_back(taskArea);
- }
- }
- return taskAreas;
- }
- class SkDngHost : public dng_host {
- public:
- explicit SkDngHost(dng_memory_allocator* allocater) : dng_host(allocater) {}
- void PerformAreaTask(dng_area_task& task, const dng_rect& area) override {
- SkTaskGroup taskGroup;
- // tileSize is typically 256x256
- const dng_point tileSize(task.FindTileSize(area));
- const std::vector<dng_rect> taskAreas = compute_task_areas(this->PerformAreaTaskThreads(),
- area, tileSize);
- const int numTasks = static_cast<int>(taskAreas.size());
- SkMutex mutex;
- SkTArray<dng_exception> exceptions;
- task.Start(numTasks, tileSize, &Allocator(), Sniffer());
- for (int taskIndex = 0; taskIndex < numTasks; ++taskIndex) {
- taskGroup.add([&mutex, &exceptions, &task, this, taskIndex, taskAreas, tileSize] {
- try {
- task.ProcessOnThread(taskIndex, taskAreas[taskIndex], tileSize, this->Sniffer());
- } catch (dng_exception& exception) {
- SkAutoMutexExclusive lock(mutex);
- exceptions.push_back(exception);
- } catch (...) {
- SkAutoMutexExclusive lock(mutex);
- exceptions.push_back(dng_exception(dng_error_unknown));
- }
- });
- }
- taskGroup.wait();
- task.Finish(numTasks);
- // We only re-throw the first exception.
- if (!exceptions.empty()) {
- Throw_dng_error(exceptions.front().ErrorCode(), nullptr, nullptr);
- }
- }
- uint32 PerformAreaTaskThreads() override {
- #ifdef SK_BUILD_FOR_ANDROID
- // Only use 1 thread. DNGs with the warp effect require a lot of memory,
- // and the amount of memory required scales linearly with the number of
- // threads. The sample used in CTS requires over 500 MB, so even two
- // threads is significantly expensive. There is no good way to tell
- // whether the image has the warp effect.
- return 1;
- #else
- return kMaxMPThreads;
- #endif
- }
- private:
- typedef dng_host INHERITED;
- };
- // T must be unsigned type.
- template <class T>
- bool safe_add_to_size_t(T arg1, T arg2, size_t* result) {
- SkASSERT(arg1 >= 0);
- SkASSERT(arg2 >= 0);
- if (arg1 >= 0 && arg2 <= std::numeric_limits<T>::max() - arg1) {
- T sum = arg1 + arg2;
- if (sum <= std::numeric_limits<size_t>::max()) {
- *result = static_cast<size_t>(sum);
- return true;
- }
- }
- return false;
- }
- bool is_asset_stream(const SkStream& stream) {
- return stream.hasLength() && stream.hasPosition();
- }
- } // namespace
- class SkRawStream {
- public:
- virtual ~SkRawStream() {}
- /*
- * Gets the length of the stream. Depending on the type of stream, this may require reading to
- * the end of the stream.
- */
- virtual uint64 getLength() = 0;
- virtual bool read(void* data, size_t offset, size_t length) = 0;
- /*
- * Creates an SkMemoryStream from the offset with size.
- * Note: for performance reason, this function is destructive to the SkRawStream. One should
- * abandon current object after the function call.
- */
- virtual std::unique_ptr<SkMemoryStream> transferBuffer(size_t offset, size_t size) = 0;
- };
- class SkRawLimitedDynamicMemoryWStream : public SkDynamicMemoryWStream {
- public:
- ~SkRawLimitedDynamicMemoryWStream() override {}
- bool write(const void* buffer, size_t size) override {
- size_t newSize;
- if (!safe_add_to_size_t(this->bytesWritten(), size, &newSize) ||
- newSize > kMaxStreamSize)
- {
- SkCodecPrintf("Error: Stream size exceeds the limit.\n");
- return false;
- }
- return this->INHERITED::write(buffer, size);
- }
- private:
- // Most of valid RAW images will not be larger than 100MB. This limit is helpful to avoid
- // streaming too large data chunk. We can always adjust the limit here if we need.
- const size_t kMaxStreamSize = 100 * 1024 * 1024; // 100MB
- typedef SkDynamicMemoryWStream INHERITED;
- };
- // Note: the maximum buffer size is 100MB (limited by SkRawLimitedDynamicMemoryWStream).
- class SkRawBufferedStream : public SkRawStream {
- public:
- explicit SkRawBufferedStream(std::unique_ptr<SkStream> stream)
- : fStream(std::move(stream))
- , fWholeStreamRead(false)
- {
- // Only use SkRawBufferedStream when the stream is not an asset stream.
- SkASSERT(!is_asset_stream(*fStream));
- }
- ~SkRawBufferedStream() override {}
- uint64 getLength() override {
- if (!this->bufferMoreData(kReadToEnd)) { // read whole stream
- ThrowReadFile();
- }
- return fStreamBuffer.bytesWritten();
- }
- bool read(void* data, size_t offset, size_t length) override {
- if (length == 0) {
- return true;
- }
- size_t sum;
- if (!safe_add_to_size_t(offset, length, &sum)) {
- return false;
- }
- return this->bufferMoreData(sum) && fStreamBuffer.read(data, offset, length);
- }
- std::unique_ptr<SkMemoryStream> transferBuffer(size_t offset, size_t size) override {
- sk_sp<SkData> data(SkData::MakeUninitialized(size));
- if (offset > fStreamBuffer.bytesWritten()) {
- // If the offset is not buffered, read from fStream directly and skip the buffering.
- const size_t skipLength = offset - fStreamBuffer.bytesWritten();
- if (fStream->skip(skipLength) != skipLength) {
- return nullptr;
- }
- const size_t bytesRead = fStream->read(data->writable_data(), size);
- if (bytesRead < size) {
- data = SkData::MakeSubset(data.get(), 0, bytesRead);
- }
- } else {
- const size_t alreadyBuffered = SkTMin(fStreamBuffer.bytesWritten() - offset, size);
- if (alreadyBuffered > 0 &&
- !fStreamBuffer.read(data->writable_data(), offset, alreadyBuffered)) {
- return nullptr;
- }
- const size_t remaining = size - alreadyBuffered;
- if (remaining) {
- auto* dst = static_cast<uint8_t*>(data->writable_data()) + alreadyBuffered;
- const size_t bytesRead = fStream->read(dst, remaining);
- size_t newSize;
- if (bytesRead < remaining) {
- if (!safe_add_to_size_t(alreadyBuffered, bytesRead, &newSize)) {
- return nullptr;
- }
- data = SkData::MakeSubset(data.get(), 0, newSize);
- }
- }
- }
- return SkMemoryStream::Make(data);
- }
- private:
- // Note: if the newSize == kReadToEnd (0), this function will read to the end of stream.
- bool bufferMoreData(size_t newSize) {
- if (newSize == kReadToEnd) {
- if (fWholeStreamRead) { // already read-to-end.
- return true;
- }
- // TODO: optimize for the special case when the input is SkMemoryStream.
- return SkStreamCopy(&fStreamBuffer, fStream.get());
- }
- if (newSize <= fStreamBuffer.bytesWritten()) { // already buffered to newSize
- return true;
- }
- if (fWholeStreamRead) { // newSize is larger than the whole stream.
- return false;
- }
- // Try to read at least 8192 bytes to avoid to many small reads.
- const size_t kMinSizeToRead = 8192;
- const size_t sizeRequested = newSize - fStreamBuffer.bytesWritten();
- const size_t sizeToRead = SkTMax(kMinSizeToRead, sizeRequested);
- SkAutoSTMalloc<kMinSizeToRead, uint8> tempBuffer(sizeToRead);
- const size_t bytesRead = fStream->read(tempBuffer.get(), sizeToRead);
- if (bytesRead < sizeRequested) {
- return false;
- }
- return fStreamBuffer.write(tempBuffer.get(), bytesRead);
- }
- std::unique_ptr<SkStream> fStream;
- bool fWholeStreamRead;
- // Use a size-limited stream to avoid holding too huge buffer.
- SkRawLimitedDynamicMemoryWStream fStreamBuffer;
- const size_t kReadToEnd = 0;
- };
- class SkRawAssetStream : public SkRawStream {
- public:
- explicit SkRawAssetStream(std::unique_ptr<SkStream> stream)
- : fStream(std::move(stream))
- {
- // Only use SkRawAssetStream when the stream is an asset stream.
- SkASSERT(is_asset_stream(*fStream));
- }
- ~SkRawAssetStream() override {}
- uint64 getLength() override {
- return fStream->getLength();
- }
- bool read(void* data, size_t offset, size_t length) override {
- if (length == 0) {
- return true;
- }
- size_t sum;
- if (!safe_add_to_size_t(offset, length, &sum)) {
- return false;
- }
- return fStream->seek(offset) && (fStream->read(data, length) == length);
- }
- std::unique_ptr<SkMemoryStream> transferBuffer(size_t offset, size_t size) override {
- if (fStream->getLength() < offset) {
- return nullptr;
- }
- size_t sum;
- if (!safe_add_to_size_t(offset, size, &sum)) {
- return nullptr;
- }
- // This will allow read less than the requested "size", because the JPEG codec wants to
- // handle also a partial JPEG file.
- const size_t bytesToRead = SkTMin(sum, fStream->getLength()) - offset;
- if (bytesToRead == 0) {
- return nullptr;
- }
- if (fStream->getMemoryBase()) { // directly copy if getMemoryBase() is available.
- sk_sp<SkData> data(SkData::MakeWithCopy(
- static_cast<const uint8_t*>(fStream->getMemoryBase()) + offset, bytesToRead));
- fStream.reset();
- return SkMemoryStream::Make(data);
- } else {
- sk_sp<SkData> data(SkData::MakeUninitialized(bytesToRead));
- if (!fStream->seek(offset)) {
- return nullptr;
- }
- const size_t bytesRead = fStream->read(data->writable_data(), bytesToRead);
- if (bytesRead < bytesToRead) {
- data = SkData::MakeSubset(data.get(), 0, bytesRead);
- }
- return SkMemoryStream::Make(data);
- }
- }
- private:
- std::unique_ptr<SkStream> fStream;
- };
- class SkPiexStream : public ::piex::StreamInterface {
- public:
- // Will NOT take the ownership of the stream.
- explicit SkPiexStream(SkRawStream* stream) : fStream(stream) {}
- ~SkPiexStream() override {}
- ::piex::Error GetData(const size_t offset, const size_t length,
- uint8* data) override {
- return fStream->read(static_cast<void*>(data), offset, length) ?
- ::piex::Error::kOk : ::piex::Error::kFail;
- }
- private:
- SkRawStream* fStream;
- };
- class SkDngStream : public dng_stream {
- public:
- // Will NOT take the ownership of the stream.
- SkDngStream(SkRawStream* stream) : fStream(stream) {}
- ~SkDngStream() override {}
- uint64 DoGetLength() override { return fStream->getLength(); }
- void DoRead(void* data, uint32 count, uint64 offset) override {
- size_t sum;
- if (!safe_add_to_size_t(static_cast<uint64>(count), offset, &sum) ||
- !fStream->read(data, static_cast<size_t>(offset), static_cast<size_t>(count))) {
- ThrowReadFile();
- }
- }
- private:
- SkRawStream* fStream;
- };
- class SkDngImage {
- public:
- /*
- * Initializes the object with the information from Piex in a first attempt. This way it can
- * save time and storage to obtain the DNG dimensions and color filter array (CFA) pattern
- * which is essential for the demosaicing of the sensor image.
- * Note: this will take the ownership of the stream.
- */
- static SkDngImage* NewFromStream(SkRawStream* stream) {
- std::unique_ptr<SkDngImage> dngImage(new SkDngImage(stream));
- #if defined(IS_FUZZING_WITH_LIBFUZZER)
- // Libfuzzer easily runs out of memory after here. To avoid that
- // We just pretend all streams are invalid. Our AFL-fuzzer
- // should still exercise this code; it's more resistant to OOM.
- return nullptr;
- #endif
- if (!dngImage->initFromPiex() && !dngImage->readDng()) {
- return nullptr;
- }
- return dngImage.release();
- }
- /*
- * Renders the DNG image to the size. The DNG SDK only allows scaling close to integer factors
- * down to 80 pixels on the short edge. The rendered image will be close to the specified size,
- * but there is no guarantee that any of the edges will match the requested size. E.g.
- * 100% size: 4000 x 3000
- * requested size: 1600 x 1200
- * returned size could be: 2000 x 1500
- */
- dng_image* render(int width, int height) {
- if (!fHost || !fInfo || !fNegative || !fDngStream) {
- if (!this->readDng()) {
- return nullptr;
- }
- }
- // DNG SDK preserves the aspect ratio, so it only needs to know the longer dimension.
- const int preferredSize = SkTMax(width, height);
- try {
- // render() takes ownership of fHost, fInfo, fNegative and fDngStream when available.
- std::unique_ptr<dng_host> host(fHost.release());
- std::unique_ptr<dng_info> info(fInfo.release());
- std::unique_ptr<dng_negative> negative(fNegative.release());
- std::unique_ptr<dng_stream> dngStream(fDngStream.release());
- host->SetPreferredSize(preferredSize);
- host->ValidateSizes();
- negative->ReadStage1Image(*host, *dngStream, *info);
- if (info->fMaskIndex != -1) {
- negative->ReadTransparencyMask(*host, *dngStream, *info);
- }
- negative->ValidateRawImageDigest(*host);
- if (negative->IsDamaged()) {
- return nullptr;
- }
- const int32 kMosaicPlane = -1;
- negative->BuildStage2Image(*host);
- negative->BuildStage3Image(*host, kMosaicPlane);
- dng_render render(*host, *negative);
- render.SetFinalSpace(dng_space_sRGB::Get());
- render.SetFinalPixelType(ttByte);
- dng_point stage3_size = negative->Stage3Image()->Size();
- render.SetMaximumSize(SkTMax(stage3_size.h, stage3_size.v));
- return render.Render();
- } catch (...) {
- return nullptr;
- }
- }
- int width() const {
- return fWidth;
- }
- int height() const {
- return fHeight;
- }
- bool isScalable() const {
- return fIsScalable;
- }
- bool isXtransImage() const {
- return fIsXtransImage;
- }
- // Quick check if the image contains a valid TIFF header as requested by DNG format.
- // Does not affect ownership of stream.
- static bool IsTiffHeaderValid(SkRawStream* stream) {
- const size_t kHeaderSize = 4;
- unsigned char header[kHeaderSize];
- if (!stream->read(header, 0 /* offset */, kHeaderSize)) {
- return false;
- }
- // Check if the header is valid (endian info and magic number "42").
- bool littleEndian;
- if (!is_valid_endian_marker(header, &littleEndian)) {
- return false;
- }
- return 0x2A == get_endian_short(header + 2, littleEndian);
- }
- private:
- bool init(int width, int height, const dng_point& cfaPatternSize) {
- fWidth = width;
- fHeight = height;
- // The DNG SDK scales only during demosaicing, so scaling is only possible when
- // a mosaic info is available.
- fIsScalable = cfaPatternSize.v != 0 && cfaPatternSize.h != 0;
- fIsXtransImage = fIsScalable ? (cfaPatternSize.v == 6 && cfaPatternSize.h == 6) : false;
- return width > 0 && height > 0;
- }
- bool initFromPiex() {
- // Does not take the ownership of rawStream.
- SkPiexStream piexStream(fStream.get());
- ::piex::PreviewImageData imageData;
- if (::piex::IsRaw(&piexStream)
- && ::piex::GetPreviewImageData(&piexStream, &imageData) == ::piex::Error::kOk)
- {
- dng_point cfaPatternSize(imageData.cfa_pattern_dim[1], imageData.cfa_pattern_dim[0]);
- return this->init(static_cast<int>(imageData.full_width),
- static_cast<int>(imageData.full_height), cfaPatternSize);
- }
- return false;
- }
- bool readDng() {
- try {
- // Due to the limit of DNG SDK, we need to reset host and info.
- fHost.reset(new SkDngHost(&fAllocator));
- fInfo.reset(new dng_info);
- fDngStream.reset(new SkDngStream(fStream.get()));
- fHost->ValidateSizes();
- fInfo->Parse(*fHost, *fDngStream);
- fInfo->PostParse(*fHost);
- if (!fInfo->IsValidDNG()) {
- return false;
- }
- fNegative.reset(fHost->Make_dng_negative());
- fNegative->Parse(*fHost, *fDngStream, *fInfo);
- fNegative->PostParse(*fHost, *fDngStream, *fInfo);
- fNegative->SynchronizeMetadata();
- dng_point cfaPatternSize(0, 0);
- if (fNegative->GetMosaicInfo() != nullptr) {
- cfaPatternSize = fNegative->GetMosaicInfo()->fCFAPatternSize;
- }
- return this->init(static_cast<int>(fNegative->DefaultCropSizeH().As_real64()),
- static_cast<int>(fNegative->DefaultCropSizeV().As_real64()),
- cfaPatternSize);
- } catch (...) {
- return false;
- }
- }
- SkDngImage(SkRawStream* stream)
- : fStream(stream)
- {}
- dng_memory_allocator fAllocator;
- std::unique_ptr<SkRawStream> fStream;
- std::unique_ptr<dng_host> fHost;
- std::unique_ptr<dng_info> fInfo;
- std::unique_ptr<dng_negative> fNegative;
- std::unique_ptr<dng_stream> fDngStream;
- int fWidth;
- int fHeight;
- bool fIsScalable;
- bool fIsXtransImage;
- };
- /*
- * Tries to handle the image with PIEX. If PIEX returns kOk and finds the preview image, create a
- * SkJpegCodec. If PIEX returns kFail, then the file is invalid, return nullptr. In other cases,
- * fallback to create SkRawCodec for DNG images.
- */
- std::unique_ptr<SkCodec> SkRawCodec::MakeFromStream(std::unique_ptr<SkStream> stream,
- Result* result) {
- std::unique_ptr<SkRawStream> rawStream;
- if (is_asset_stream(*stream)) {
- rawStream.reset(new SkRawAssetStream(std::move(stream)));
- } else {
- rawStream.reset(new SkRawBufferedStream(std::move(stream)));
- }
- // Does not take the ownership of rawStream.
- SkPiexStream piexStream(rawStream.get());
- ::piex::PreviewImageData imageData;
- if (::piex::IsRaw(&piexStream)) {
- ::piex::Error error = ::piex::GetPreviewImageData(&piexStream, &imageData);
- if (error == ::piex::Error::kFail) {
- *result = kInvalidInput;
- return nullptr;
- }
- std::unique_ptr<SkEncodedInfo::ICCProfile> profile;
- if (imageData.color_space == ::piex::PreviewImageData::kAdobeRgb) {
- skcms_ICCProfile skcmsProfile;
- skcms_Init(&skcmsProfile);
- skcms_SetTransferFunction(&skcmsProfile, &SkNamedTransferFn::k2Dot2);
- skcms_SetXYZD50(&skcmsProfile, &SkNamedGamut::kAdobeRGB);
- profile = SkEncodedInfo::ICCProfile::Make(skcmsProfile);
- }
- // Theoretically PIEX can return JPEG compressed image or uncompressed RGB image. We only
- // handle the JPEG compressed preview image here.
- if (error == ::piex::Error::kOk && imageData.preview.length > 0 &&
- imageData.preview.format == ::piex::Image::kJpegCompressed)
- {
- // transferBuffer() is destructive to the rawStream. Abandon the rawStream after this
- // function call.
- // FIXME: one may avoid the copy of memoryStream and use the buffered rawStream.
- auto memoryStream = rawStream->transferBuffer(imageData.preview.offset,
- imageData.preview.length);
- if (!memoryStream) {
- *result = kInvalidInput;
- return nullptr;
- }
- return SkJpegCodec::MakeFromStream(std::move(memoryStream), result,
- std::move(profile));
- }
- }
- if (!SkDngImage::IsTiffHeaderValid(rawStream.get())) {
- *result = kUnimplemented;
- return nullptr;
- }
- // Takes the ownership of the rawStream.
- std::unique_ptr<SkDngImage> dngImage(SkDngImage::NewFromStream(rawStream.release()));
- if (!dngImage) {
- *result = kInvalidInput;
- return nullptr;
- }
- *result = kSuccess;
- return std::unique_ptr<SkCodec>(new SkRawCodec(dngImage.release()));
- }
- SkCodec::Result SkRawCodec::onGetPixels(const SkImageInfo& dstInfo, void* dst,
- size_t dstRowBytes, const Options& options,
- int* rowsDecoded) {
- const int width = dstInfo.width();
- const int height = dstInfo.height();
- std::unique_ptr<dng_image> image(fDngImage->render(width, height));
- if (!image) {
- return kInvalidInput;
- }
- // Because the DNG SDK can not guarantee to render to requested size, we allow a small
- // difference. Only the overlapping region will be converted.
- const float maxDiffRatio = 1.03f;
- const dng_point& imageSize = image->Size();
- if (imageSize.h / (float) width > maxDiffRatio || imageSize.h < width ||
- imageSize.v / (float) height > maxDiffRatio || imageSize.v < height) {
- return SkCodec::kInvalidScale;
- }
- void* dstRow = dst;
- SkAutoTMalloc<uint8_t> srcRow(width * 3);
- dng_pixel_buffer buffer;
- buffer.fData = &srcRow[0];
- buffer.fPlane = 0;
- buffer.fPlanes = 3;
- buffer.fColStep = buffer.fPlanes;
- buffer.fPlaneStep = 1;
- buffer.fPixelType = ttByte;
- buffer.fPixelSize = sizeof(uint8_t);
- buffer.fRowStep = width * 3;
- constexpr auto srcFormat = skcms_PixelFormat_RGB_888;
- skcms_PixelFormat dstFormat;
- if (!sk_select_xform_format(dstInfo.colorType(), false, &dstFormat)) {
- return kInvalidConversion;
- }
- const skcms_ICCProfile* const srcProfile = this->getEncodedInfo().profile();
- skcms_ICCProfile dstProfileStorage;
- const skcms_ICCProfile* dstProfile = nullptr;
- if (auto cs = dstInfo.colorSpace()) {
- cs->toProfile(&dstProfileStorage);
- dstProfile = &dstProfileStorage;
- }
- for (int i = 0; i < height; ++i) {
- buffer.fArea = dng_rect(i, 0, i + 1, width);
- try {
- image->Get(buffer, dng_image::edge_zero);
- } catch (...) {
- *rowsDecoded = i;
- return kIncompleteInput;
- }
- if (!skcms_Transform(&srcRow[0], srcFormat, skcms_AlphaFormat_Unpremul, srcProfile,
- dstRow, dstFormat, skcms_AlphaFormat_Unpremul, dstProfile,
- dstInfo.width())) {
- SkDebugf("failed to transform\n");
- *rowsDecoded = i;
- return kInternalError;
- }
- dstRow = SkTAddOffset<void>(dstRow, dstRowBytes);
- }
- return kSuccess;
- }
- SkISize SkRawCodec::onGetScaledDimensions(float desiredScale) const {
- SkASSERT(desiredScale <= 1.f);
- const SkISize dim = this->dimensions();
- SkASSERT(dim.fWidth != 0 && dim.fHeight != 0);
- if (!fDngImage->isScalable()) {
- return dim;
- }
- // Limits the minimum size to be 80 on the short edge.
- const float shortEdge = static_cast<float>(SkTMin(dim.fWidth, dim.fHeight));
- if (desiredScale < 80.f / shortEdge) {
- desiredScale = 80.f / shortEdge;
- }
- // For Xtrans images, the integer-factor scaling does not support the half-size scaling case
- // (stronger downscalings are fine). In this case, returns the factor "3" scaling instead.
- if (fDngImage->isXtransImage() && desiredScale > 1.f / 3.f && desiredScale < 1.f) {
- desiredScale = 1.f / 3.f;
- }
- // Round to integer-factors.
- const float finalScale = std::floor(1.f/ desiredScale);
- return SkISize::Make(static_cast<int32_t>(std::floor(dim.fWidth / finalScale)),
- static_cast<int32_t>(std::floor(dim.fHeight / finalScale)));
- }
- bool SkRawCodec::onDimensionsSupported(const SkISize& dim) {
- const SkISize fullDim = this->dimensions();
- const float fullShortEdge = static_cast<float>(SkTMin(fullDim.fWidth, fullDim.fHeight));
- const float shortEdge = static_cast<float>(SkTMin(dim.fWidth, dim.fHeight));
- SkISize sizeFloor = this->onGetScaledDimensions(1.f / std::floor(fullShortEdge / shortEdge));
- SkISize sizeCeil = this->onGetScaledDimensions(1.f / std::ceil(fullShortEdge / shortEdge));
- return sizeFloor == dim || sizeCeil == dim;
- }
- SkRawCodec::~SkRawCodec() {}
- SkRawCodec::SkRawCodec(SkDngImage* dngImage)
- : INHERITED(SkEncodedInfo::Make(dngImage->width(), dngImage->height(),
- SkEncodedInfo::kRGB_Color,
- SkEncodedInfo::kOpaque_Alpha, 8),
- skcms_PixelFormat_RGBA_8888, nullptr)
- , fDngImage(dngImage) {}
|