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paint_op_reader.cc
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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/paint/paint_op_reader.h"
#include <stddef.h>
#include <algorithm>
#include <memory>
#include <type_traits>
#include <utility>
#include <vector>
#include "base/bits.h"
#include "base/compiler_specific.h"
#include "base/debug/dump_without_crashing.h"
#include "base/memory/raw_ptr.h"
#include "base/metrics/histogram_functions.h"
#include "base/notreached.h"
#include "base/rand_util.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "cc/paint/image_transfer_cache_entry.h"
#include "cc/paint/paint_cache.h"
#include "cc/paint/paint_flags.h"
#include "cc/paint/paint_image_builder.h"
#include "cc/paint/paint_op_buffer.h"
#include "cc/paint/paint_shader.h"
#include "cc/paint/shader_transfer_cache_entry.h"
#include "cc/paint/skottie_transfer_cache_entry.h"
#include "cc/paint/skottie_wrapper.h"
#include "cc/paint/transfer_cache_deserialize_helper.h"
#include "components/crash/core/common/crash_key.h"
#include "third_party/skia/include/core/SkColorSpace.h"
#include "third_party/skia/include/core/SkPath.h"
#include "third_party/skia/include/core/SkRRect.h"
#include "third_party/skia/include/core/SkSerialProcs.h"
#include "third_party/skia/include/private/chromium/GrSlug.h"
#include "third_party/skia/include/private/chromium/SkChromeRemoteGlyphCache.h"
namespace cc {
namespace {
bool IsValidPaintShaderType(PaintShader::Type type) {
return static_cast<uint8_t>(type) <
static_cast<uint8_t>(PaintShader::Type::kShaderCount);
}
bool IsValidPaintShaderScalingBehavior(PaintShader::ScalingBehavior behavior) {
return behavior == PaintShader::ScalingBehavior::kRasterAtScale ||
behavior == PaintShader::ScalingBehavior::kFixedScale;
}
} // namespace
// static
void PaintOpReader::FixupMatrixPostSerialization(SkMatrix* matrix) {
// Can't trust malicious clients to provide the correct derived matrix type.
// However, if a matrix thinks that it's identity, then make it so.
if (matrix->isIdentity())
matrix->setIdentity();
else
matrix->dirtyMatrixTypeCache();
}
// static
bool PaintOpReader::ReadAndValidateOpHeader(const volatile void* input,
size_t input_size,
uint8_t* type,
uint32_t* skip) {
if (input_size < 4)
return false;
uint32_t first_word = reinterpret_cast<const volatile uint32_t*>(input)[0];
*type = static_cast<uint8_t>(first_word & 0xFF);
*skip = first_word >> 8;
if (input_size < *skip)
return false;
if (*skip % PaintOpBuffer::PaintOpAlign != 0)
return false;
if (*type > static_cast<uint8_t>(PaintOpType::LastPaintOpType))
return false;
return true;
}
template <typename T>
void PaintOpReader::ReadSimple(T* val) {
static_assert(std::is_trivially_copyable_v<T>);
DCHECK_EQ(memory_, base::bits::AlignUp(memory_, PaintOpWriter::Alignment()));
// Align everything to 4 bytes, as the writer does.
static constexpr size_t size =
base::bits::AlignUp(sizeof(T), PaintOpWriter::Alignment());
if (remaining_bytes_ < size)
SetInvalid(DeserializationError::kInsufficientRemainingBytes_ReadSimple);
if (!valid_)
return;
// Most of the time this is used for primitives, but this function is also
// used for SkRect/SkIRect/SkMatrix whose implicit operator= can't use a
// volatile. TOCTOU violations don't matter for these simple types so
// use assignment.
*val = *reinterpret_cast<const T*>(const_cast<const char*>(memory_));
memory_ += size;
remaining_bytes_ -= size;
}
uint8_t* PaintOpReader::CopyScratchSpace(size_t bytes) {
DCHECK(SkIsAlign4(reinterpret_cast<uintptr_t>(memory_)));
if (options_.scratch_buffer->size() < bytes)
options_.scratch_buffer->resize(bytes);
memcpy(options_.scratch_buffer->data(), const_cast<const char*>(memory_),
bytes);
return options_.scratch_buffer->data();
}
template <typename T>
void PaintOpReader::ReadFlattenable(
sk_sp<T>* val,
Factory<T> factory,
DeserializationError error_on_factory_failure) {
size_t bytes = 0;
ReadSize(&bytes);
if (remaining_bytes_ < bytes) {
SetInvalid(
DeserializationError::kInsufficientRemainingBytes_ReadFlattenable);
return;
}
if (bytes == 0)
return;
auto* scratch = CopyScratchSpace(bytes);
val->reset(factory(scratch, bytes, nullptr).release());
if (!val) {
SetInvalid(error_on_factory_failure);
return;
}
DidRead(bytes);
}
void PaintOpReader::ReadData(size_t bytes, void* data) {
DCHECK_EQ(memory_, base::bits::AlignUp(memory_, PaintOpWriter::Alignment()));
if (bytes == 0)
return;
if (remaining_bytes_ < bytes) {
SetInvalid(DeserializationError::kInsufficientRemainingBytes_ReadData);
return;
}
memcpy(data, const_cast<const char*>(memory_), bytes);
DidRead(bytes);
}
void PaintOpReader::ReadSize(size_t* size) {
AlignMemory(8);
if (!valid_)
return;
uint64_t size64 = 0;
ReadSimple(&size64);
*size = size64;
}
void PaintOpReader::Read(SkScalar* data) {
ReadSimple(data);
}
void
PaintOpReader::Read(uint8_t* data) {
ReadSimple(data);
}
void PaintOpReader::Read(uint32_t* data) {
ReadSimple(data);
}
void PaintOpReader::Read(uint64_t* data) {
ReadSimple(data);
}
void PaintOpReader::Read(int32_t* data) {
ReadSimple(data);
}
void PaintOpReader::Read(SkRect* rect) {
ReadSimple(rect);
}
void PaintOpReader::Read(SkIRect* rect) {
ReadSimple(rect);
}
void PaintOpReader::Read(SkRRect* rect) {
ReadSimple(rect);
}
void PaintOpReader::Read(SkColor4f* color) {
ReadSimple(color);
}
void PaintOpReader::Read(SkPath* path) {
uint32_t path_id;
ReadSimple(&path_id);
if (!valid_)
return;
uint32_t entry_state_int = 0u;
ReadSimple(&entry_state_int);
if (entry_state_int > static_cast<uint32_t>(PaintCacheEntryState::kLast)) {
valid_ = false;
return;
}
auto entry_state = static_cast<PaintCacheEntryState>(entry_state_int);
switch (entry_state) {
case PaintCacheEntryState::kEmpty:
return;
case PaintCacheEntryState::kCached:
if (!options_.paint_cache->GetPath(path_id, path))
SetInvalid(DeserializationError::kMissingPaintCachePathEntry);
return;
case PaintCacheEntryState::kInlined:
case PaintCacheEntryState::kInlinedDoNotCache: {
size_t path_bytes = 0u;
ReadSize(&path_bytes);
if (path_bytes > remaining_bytes_)
SetInvalid(
DeserializationError::kInsufficientRemainingBytes_Read_SkPath);
if (path_bytes == 0u)
SetInvalid(DeserializationError::kZeroSkPathBytes);
if (!valid_)
return;
auto* scratch = CopyScratchSpace(path_bytes);
size_t bytes_read = path->readFromMemory(scratch, path_bytes);
if (bytes_read == 0u) {
SetInvalid(DeserializationError::kSkPathReadFromMemoryFailure);
return;
}
if (entry_state == PaintCacheEntryState::kInlined) {
options_.paint_cache->PutPath(path_id, *path);
} else {
// If we know that this path will only be drawn once, which is
// implied by kInlinedDoNotCache, we signal to skia that it should not
// do any caching either.
path->setIsVolatile(true);
}
DidRead(path_bytes);
return;
}
}
}
void PaintOpReader::Read(PaintFlags* flags) {
ReadSimple(&flags->color_);
Read(&flags->width_);
Read(&flags->miter_limit_);
Read(&flags->blend_mode_);
ReadSimple(&flags->bitfields_uint_);
ReadFlattenable(&flags->path_effect_, SkPathEffect::Deserialize,
DeserializationError::kSkPathEffectUnflattenFailure);
ReadFlattenable(&flags->mask_filter_, SkMaskFilter::Deserialize,
DeserializationError::kSkMaskFilterUnflattenFailure);
ReadFlattenable(&flags->color_filter_, SkColorFilter::Deserialize,
DeserializationError::kSkColorFilterUnflattenFailure);
if (enable_security_constraints_) {
size_t bytes = 0;
ReadSize(&bytes);
if (bytes != 0u) {
SetInvalid(DeserializationError::kDrawLooperForbidden);
return;
}
} else {
ReadFlattenable(&flags->draw_looper_, SkDrawLooper::Deserialize,
DeserializationError::kSkDrawLooperUnflattenFailure);
}
Read(&flags->image_filter_);
Read(&flags->shader_);
}
void PaintOpReader::Read(PaintImage* image) {
uint8_t serialized_type_int = 0u;
Read(&serialized_type_int);
if (serialized_type_int >
static_cast<uint8_t>(PaintOp::SerializedImageType::kLastType)) {
SetInvalid(DeserializationError::kInvalidSerializedImageType);
return;
}
auto serialized_type =
static_cast<PaintOp::SerializedImageType>(serialized_type_int);
if (serialized_type == PaintOp::SerializedImageType::kNoImage)
return;
if (enable_security_constraints_) {
switch (serialized_type) {
case PaintOp::SerializedImageType::kNoImage:
NOTREACHED();
return;
case PaintOp::SerializedImageType::kImageData: {
SkColorType color_type;
Read(&color_type);
uint32_t width;
Read(&width);
uint32_t height;
Read(&height);
size_t pixel_size;
ReadSize(&pixel_size);
if (!valid_)
return;
SkImageInfo image_info =
SkImageInfo::Make(width, height, color_type, kPremul_SkAlphaType);
if (pixel_size < image_info.computeMinByteSize()) {
SetInvalid(DeserializationError::kInsufficientPixelData);
return;
}
const volatile void* pixel_data = ExtractReadableMemory(pixel_size);
if (!valid_)
return;
SkPixmap pixmap(image_info, const_cast<const void*>(pixel_data),
image_info.minRowBytes());
*image = PaintImageBuilder::WithDefault()
.set_id(PaintImage::GetNextId())
.set_texture_image(SkImage::MakeRasterCopy(pixmap),
PaintImage::kNonLazyStableId)
.TakePaintImage();
}
return;
case PaintOp::SerializedImageType::kTransferCacheEntry:
case PaintOp::SerializedImageType::kMailbox:
SetInvalid(DeserializationError::kForbiddenSerializedImageType);
return;
}
NOTREACHED();
return;
}
if (serialized_type == PaintOp::SerializedImageType::kMailbox) {
if (!options_.shared_image_provider) {
SetInvalid(DeserializationError::kMissingSharedImageProvider);
return;
}
gpu::Mailbox mailbox;
Read(&mailbox);
if (mailbox.IsZero()) {
SetInvalid(DeserializationError::kZeroMailbox);
return;
}
SharedImageProvider::Error error;
sk_sp<SkImage> sk_image =
options_.shared_image_provider->OpenSharedImageForRead(mailbox, error);
if (error != SharedImageProvider::Error::kNoError) {
switch (error) {
case SharedImageProvider::Error::kNoAccess:
SetInvalid(DeserializationError::kSharedImageProviderNoAccess);
break;
case SharedImageProvider::Error::kSkImageCreationFailed:
SetInvalid(
DeserializationError::kSharedImageProviderSkImageCreationFailed);
break;
case SharedImageProvider::Error::kUnknownMailbox:
SetInvalid(DeserializationError::kSharedImageProviderUnknownMailbox);
break;
default:
NOTREACHED();
break;
}
SetInvalid(DeserializationError::kSharedImageOpenFailure);
return;
}
DCHECK(sk_image);
*image = PaintImageBuilder::WithDefault()
.set_id(PaintImage::GetNextId())
.set_texture_image(std::move(sk_image),
PaintImage::kNonLazyStableId)
.TakePaintImage();
return;
}
if (serialized_type != PaintOp::SerializedImageType::kTransferCacheEntry) {
SetInvalid(DeserializationError::kUnexpectedSerializedImageType);
return;
}
uint32_t transfer_cache_entry_id;
ReadSimple(&transfer_cache_entry_id);
if (!valid_)
return;
bool needs_mips;
ReadSimple(&needs_mips);
if (!valid_)
return;
// If we encountered a decode failure, we may write an invalid id for the
// image. In these cases, just return, leaving the image as nullptr.
if (transfer_cache_entry_id == kInvalidImageTransferCacheEntryId)
return;
// The transfer cache entry for an image may not exist if the upload fails.
if (auto* entry =
options_.transfer_cache->GetEntryAs<ServiceImageTransferCacheEntry>(
transfer_cache_entry_id)) {
if (needs_mips)
entry->EnsureMips();
*image =
PaintImageBuilder::WithDefault()
.set_id(PaintImage::GetNextId())
.set_texture_image(entry->image(), PaintImage::kNonLazyStableId)
.TakePaintImage();
}
}
void PaintOpReader::Read(sk_sp<SkData>* data) {
size_t bytes = 0;
ReadSize(&bytes);
if (remaining_bytes_ < bytes)
SetInvalid(DeserializationError::kInsufficientRemainingBytes_Read_SkData);
if (!valid_)
return;
// Separate out empty vs not valid cases.
if (bytes == 0) {
bool has_data = false;
Read(&has_data);
if (has_data)
*data = SkData::MakeEmpty();
return;
}
// This is safe to cast away the volatile as it is just a memcpy internally.
*data = SkData::MakeWithCopy(const_cast<const char*>(memory_), bytes);
DidRead(bytes);
}
void PaintOpReader::Read(sk_sp<SkColorSpace>* color_space) {
size_t size = 0;
ReadSize(&size);
if (remaining_bytes_ < size)
valid_ = false;
if (!valid_ || size == 0)
return;
auto* scratch = CopyScratchSpace(size);
*color_space = SkColorSpace::Deserialize(scratch, size);
// If this had non-zero bytes, it should be a valid color space.
if (!color_space)
SetInvalid(DeserializationError::kSkColorSpaceDeserializeFailure);
DidRead(size);
}
void PaintOpReader::Read(sk_sp<GrSlug>* slug) {
AssertAlignment(PaintOpWriter::Alignment());
size_t data_bytes = 0u;
ReadSize(&data_bytes);
if (data_bytes == 0) {
*slug = nullptr;
return;
}
if (remaining_bytes_ < data_bytes) {
SetInvalid(DeserializationError::kInsufficientRemainingBytes_Read_GrSlug);
return;
}
*slug = GrSlug::Deserialize(const_cast<const char*>(memory_), data_bytes,
options_.strike_client);
DidRead(data_bytes);
if (!*slug) {
SetInvalid(DeserializationError::kGrSlugDeserializeFailure);
return;
}
}
void PaintOpReader::Read(sk_sp<PaintShader>* shader) {
bool has_shader = false;
ReadSimple(&has_shader);
if (!has_shader) {
*shader = nullptr;
return;
}
PaintShader::Type shader_type;
ReadSimple(&shader_type);
// Avoid creating a shader if something is invalid.
if (!valid_ || !IsValidPaintShaderType(shader_type)) {
SetInvalid(DeserializationError::kInvalidPaintShaderType);
return;
}
*shader = sk_sp<PaintShader>(new PaintShader(shader_type));
PaintShader& ref = **shader;
ReadSimple(&ref.flags_);
ReadSimple(&ref.end_radius_);
ReadSimple(&ref.start_radius_);
Read(&ref.tx_);
Read(&ref.ty_);
ReadSimple(&ref.fallback_color_);
ReadSimple(&ref.scaling_behavior_);
if (!IsValidPaintShaderScalingBehavior(ref.scaling_behavior_))
SetInvalid(DeserializationError::kInvalidPaintShaderScalingBehavior);
bool has_local_matrix = false;
ReadSimple(&has_local_matrix);
if (has_local_matrix) {
ref.local_matrix_.emplace();
Read(&*ref.local_matrix_);
}
ReadSimple(&ref.center_);
ReadSimple(&ref.tile_);
ReadSimple(&ref.start_point_);
ReadSimple(&ref.end_point_);
ReadSimple(&ref.start_degrees_);
ReadSimple(&ref.end_degrees_);
Read(&ref.image_);
bool has_record = false;
ReadSimple(&has_record);
uint32_t shader_id = PaintShader::kInvalidRecordShaderId;
size_t shader_size = 0;
if (has_record) {
if (shader_type != PaintShader::Type::kPaintRecord) {
SetInvalid(DeserializationError::kUnexpectedPaintShaderType);
return;
}
Read(&shader_id);
if (shader_id == PaintShader::kInvalidRecordShaderId) {
SetInvalid(DeserializationError::kInvalidRecordShaderId);
return;
}
// Track dependent transfer cache entries to make cached shader size
// more realistic.
size_t pre_size = options_.transfer_cache->GetTotalEntrySizes();
size_t record_size = Read(&ref.record_);
size_t post_size = options_.transfer_cache->GetTotalEntrySizes();
shader_size = post_size - pre_size + record_size;
ref.id_ = shader_id;
}
decltype(ref.colors_)::size_type colors_size = 0;
ReadSize(&colors_size);
// If there are too many colors, abort.
if (colors_size > remaining_bytes_) {
SetInvalid(DeserializationError::
kInsufficientRemainingBytes_Read_PaintShader_ColorSize);
return;
}
size_t colors_bytes =
colors_size * (colors_size > 0 ? sizeof(ref.colors_[0]) : 0u);
if (colors_bytes > remaining_bytes_) {
SetInvalid(DeserializationError::
kInsufficientRemainingBytes_Read_PaintShader_ColorBytes);
return;
}
ref.colors_.resize(colors_size);
ReadData(colors_bytes, ref.colors_.data());
decltype(ref.positions_)::size_type positions_size = 0;
ReadSize(&positions_size);
// Positions are optional. If they exist, they have the same count as colors.
if (positions_size > 0 && positions_size != colors_size) {
SetInvalid(DeserializationError::kInvalidPaintShaderPositionsSize);
return;
}
size_t positions_bytes = positions_size * sizeof(SkScalar);
if (positions_bytes > remaining_bytes_) {
SetInvalid(DeserializationError::
kInsufficientRemainingBytes_Read_PaintShader_Positions);
return;
}
ref.positions_.resize(positions_size);
ReadData(positions_size * sizeof(SkScalar), ref.positions_.data());
// We don't write the cached shader, so don't attempt to read it either.
if (!(*shader)->IsValid()) {
SetInvalid(DeserializationError::kInvalidPaintShader);
return;
}
// All shader types but records are done.
if (shader_type != PaintShader::Type::kPaintRecord) {
(*shader)->ResolveSkObjects();
return;
}
// Record shaders have shader ids. Attempt to use cached versions of
// these so that Skia can cache based on SkPictureShader::fUniqueId.
// These shaders are always serialized (and assumed to not be large
// records). Handling this edge case in this roundabout way prevents
// transfer cache entries from needing to depend on other transfer cache
// entries.
auto* entry =
options_.transfer_cache->GetEntryAs<ServiceShaderTransferCacheEntry>(
shader_id);
// Only consider entries that use the same scale. This limits the service
// side transfer cache to only having one entry per shader but this will hit
// the common case of enabling Skia reuse.
if (entry && entry->shader()->tile_ == ref.tile_) {
DCHECK(!ref.sk_cached_picture_);
ref.sk_cached_picture_ = entry->shader()->sk_cached_picture_;
} else {
ref.ResolveSkObjects();
DCHECK(ref.sk_cached_picture_);
options_.transfer_cache->CreateLocalEntry(
shader_id, std::make_unique<ServiceShaderTransferCacheEntry>(
*shader, shader_size));
}
}
void PaintOpReader::Read(SkMatrix* matrix) {
ReadSimple(matrix);
FixupMatrixPostSerialization(matrix);
}
void PaintOpReader::Read(SkM44* matrix) {
ReadSimple(matrix);
}
void PaintOpReader::Read(SkSamplingOptions* sampling) {
bool useCubic;
Read(&useCubic);
if (useCubic) {
SkCubicResampler cubic;
Read(&cubic.B);
Read(&cubic.C);
*sampling = SkSamplingOptions(cubic);
} else {
SkFilterMode filter;
SkMipmapMode mipmap;
Read(&filter);
Read(&mipmap);
*sampling = SkSamplingOptions(filter, mipmap);
}
}
void PaintOpReader::Read(SkYUVColorSpace* yuv_color_space) {
uint32_t raw_yuv_color_space = kIdentity_SkYUVColorSpace;
ReadSimple(&raw_yuv_color_space);
if (raw_yuv_color_space > kLastEnum_SkYUVColorSpace) {
SetInvalid(DeserializationError::kInvalidSkYUVColorSpace);
return;
}
*yuv_color_space = static_cast<SkYUVColorSpace>(raw_yuv_color_space);
}
void PaintOpReader::Read(SkYUVAInfo::PlaneConfig* plane_config) {
uint32_t raw_plane_config =
static_cast<uint32_t>(SkYUVAInfo::PlaneConfig::kUnknown);
ReadSimple(&raw_plane_config);
if (raw_plane_config >
static_cast<uint32_t>(SkYUVAInfo::PlaneConfig::kLast)) {
SetInvalid(DeserializationError::kInvalidPlaneConfig);
return;
}
*plane_config = static_cast<SkYUVAInfo::PlaneConfig>(raw_plane_config);
}
void PaintOpReader::Read(SkYUVAInfo::Subsampling* subsampling) {
uint32_t raw_subsampling =
static_cast<uint32_t>(SkYUVAInfo::Subsampling::kUnknown);
ReadSimple(&raw_subsampling);
if (raw_subsampling > static_cast<uint32_t>(SkYUVAInfo::Subsampling::kLast)) {
SetInvalid(DeserializationError::kInvalidSubsampling);
return;
}
*subsampling = static_cast<SkYUVAInfo::Subsampling>(raw_subsampling);
}
void PaintOpReader::Read(gpu::Mailbox* mailbox) {
ReadData(sizeof(gpu::Mailbox::Name), (*mailbox).name);
}
void PaintOpReader::Read(scoped_refptr<SkottieWrapper>* skottie) {
if (!options_.is_privileged) {
valid_ = false;
return;
}
uint32_t transfer_cache_entry_id;
ReadSimple(&transfer_cache_entry_id);
if (!valid_)
return;
auto* entry =
options_.transfer_cache->GetEntryAs<ServiceSkottieTransferCacheEntry>(
transfer_cache_entry_id);
if (entry) {
*skottie = entry->skottie();
} else {
valid_ = false;
}
size_t bytes_to_skip = 0u;
ReadSize(&bytes_to_skip);
if (!valid_)
return;
if (bytes_to_skip > remaining_bytes_) {
valid_ = false;
return;
}
DidRead(bytes_to_skip);
}
void PaintOpReader::AlignMemory(size_t alignment) {
size_t padding = base::bits::AlignUp(memory_, alignment) - memory_;
if (padding > remaining_bytes_)
SetInvalid(DeserializationError::kInsufficientRemainingBytes_AlignMemory);
memory_ += padding;
remaining_bytes_ -= padding;
}
// Don't inline this function so that crash reports can show the caller.
NOINLINE void PaintOpReader::SetInvalid(DeserializationError error) {
static crash_reporter::CrashKeyString<4> deserialization_error_crash_key(
"PaintOpReader deserialization error");
base::UmaHistogramEnumeration("GPU.PaintOpReader.DeserializationError",
error);
if (valid_ && options_.crash_dump_on_failure && base::RandInt(1, 10) == 1) {
crash_reporter::ScopedCrashKeyString crash_key_scope(
&deserialization_error_crash_key,
base::NumberToString(static_cast<int>(error)));
base::debug::DumpWithoutCrashing();
}
valid_ = false;
}
const volatile void* PaintOpReader::ExtractReadableMemory(size_t bytes) {
if (remaining_bytes_ < bytes)
SetInvalid(DeserializationError::
kInsufficientRemainingBytes_ExtractReadableMemory);
if (!valid_)
return nullptr;
if (bytes == 0)
return nullptr;
const volatile void* extracted_memory = memory_;
DidRead(bytes);
return extracted_memory;
}
void PaintOpReader::Read(sk_sp<PaintFilter>* filter) {
PaintFilter::Type type;
ReadEnum(&type);
if (!valid_)
return;
if (type == PaintFilter::Type::kNullFilter) {
*filter = nullptr;
return;
}
uint32_t has_crop_rect = 0;
absl::optional<PaintFilter::CropRect> crop_rect;
ReadSimple(&has_crop_rect);
if (has_crop_rect) {
SkRect rect = SkRect::MakeEmpty();
ReadSimple(&rect);
crop_rect.emplace(rect);
}
AssertAlignment(PaintOpWriter::Alignment());
switch (type) {
case PaintFilter::Type::kNullFilter:
NOTREACHED();
break;
case PaintFilter::Type::kColorFilter:
ReadColorFilterPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kBlur:
ReadBlurPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kDropShadow:
ReadDropShadowPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kMagnifier:
ReadMagnifierPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kCompose:
ReadComposePaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kAlphaThreshold:
ReadAlphaThresholdPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kXfermode:
ReadXfermodePaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kArithmetic:
ReadArithmeticPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kMatrixConvolution:
ReadMatrixConvolutionPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kDisplacementMapEffect:
ReadDisplacementMapEffectPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kImage:
ReadImagePaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kPaintRecord:
ReadRecordPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kMerge:
ReadMergePaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kMorphology:
ReadMorphologyPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kOffset:
ReadOffsetPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kTile:
ReadTilePaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kTurbulence:
ReadTurbulencePaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kShader:
ReadShaderPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kMatrix:
ReadMatrixPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kLightingDistant:
ReadLightingDistantPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kLightingPoint:
ReadLightingPointPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kLightingSpot:
ReadLightingSpotPaintFilter(filter, crop_rect);
break;
case PaintFilter::Type::kStretch:
ReadStretchPaintFilter(filter, crop_rect);
break;
}
}
void PaintOpReader::ReadColorFilterPaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
sk_sp<SkColorFilter> color_filter;
sk_sp<PaintFilter> input;
ReadFlattenable(&color_filter, SkColorFilter::Deserialize,
DeserializationError::kSkColorFilterUnflattenFailure);
Read(&input);
if (!color_filter)
SetInvalid(DeserializationError::kZeroSkColorFilterBytes);
if (!valid_)
return;
filter->reset(new ColorFilterPaintFilter(std::move(color_filter),
std::move(input),
base::OptionalOrNullptr(crop_rect)));
}
void PaintOpReader::ReadBlurPaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
SkScalar sigma_x = 0.f;
SkScalar sigma_y = 0.f;
SkTileMode tile_mode;
sk_sp<PaintFilter> input;
Read(&sigma_x);
Read(&sigma_y);
Read(&tile_mode);
Read(&input);
if (!valid_)
return;
filter->reset(new BlurPaintFilter(sigma_x, sigma_y, tile_mode,
std::move(input),
base::OptionalOrNullptr(crop_rect)));
}
void PaintOpReader::ReadDropShadowPaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
SkScalar dx = 0.f;
SkScalar dy = 0.f;
SkScalar sigma_x = 0.f;
SkScalar sigma_y = 0.f;
SkColor color = SK_ColorBLACK;
DropShadowPaintFilter::ShadowMode shadow_mode;
sk_sp<PaintFilter> input;
Read(&dx);
Read(&dy);
Read(&sigma_x);
Read(&sigma_y);
Read(&color);
ReadEnum(&shadow_mode);
Read(&input);
if (!valid_)
return;
// TODO(crbug/1308932): Remove FromColor and make all SkColor4f.
filter->reset(new DropShadowPaintFilter(
dx, dy, sigma_x, sigma_y, SkColor4f::FromColor(color), shadow_mode,
std::move(input), base::OptionalOrNullptr(crop_rect)));
}
void PaintOpReader::ReadMagnifierPaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
SkRect src_rect = SkRect::MakeEmpty();
SkScalar inset = 0.f;
sk_sp<PaintFilter> input;
Read(&src_rect);
Read(&inset);
Read(&input);
if (!valid_)
return;
filter->reset(new MagnifierPaintFilter(src_rect, inset, std::move(input),
base::OptionalOrNullptr(crop_rect)));
}
void PaintOpReader::ReadComposePaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
sk_sp<PaintFilter> outer;
sk_sp<PaintFilter> inner;
Read(&outer);
Read(&inner);
if (!valid_)
return;
filter->reset(new ComposePaintFilter(std::move(outer), std::move(inner)));
}
void PaintOpReader::ReadAlphaThresholdPaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
SkRegion region;
SkScalar inner_min = 0.f;
SkScalar outer_max = 0.f;
sk_sp<PaintFilter> input;
Read(®ion);
ReadSimple(&inner_min);
ReadSimple(&outer_max);
Read(&input);
if (!valid_)
return;
filter->reset(new AlphaThresholdPaintFilter(
region, inner_min, outer_max, std::move(input),
base::OptionalOrNullptr(crop_rect)));
}
void PaintOpReader::ReadXfermodePaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
SkBlendMode blend_mode;
sk_sp<PaintFilter> background;
sk_sp<PaintFilter> foreground;
Read(&blend_mode);
Read(&background);
Read(&foreground);
if (!valid_)
return;
filter->reset(new XfermodePaintFilter(blend_mode, std::move(background),
std::move(foreground),
base::OptionalOrNullptr(crop_rect)));
}
void PaintOpReader::ReadArithmeticPaintFilter(
sk_sp<PaintFilter>* filter,
const absl::optional<PaintFilter::CropRect>& crop_rect) {
float k1 = 0.f;
float k2 = 0.f;
float k3 = 0.f;