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paint_op_writer.cc
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paint_op_writer.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_writer.h"
#include "cc/paint/paint_flags.h"
#include "cc/paint/paint_shader.h"
#include "third_party/skia/include/core/SkFlattenableSerialization.h"
#include "third_party/skia/include/core/SkTextBlob.h"
namespace cc {
PaintOpWriter::PaintOpWriter(void* memory, size_t size)
: memory_(static_cast<char*>(memory) + HeaderBytes()),
size_(size),
remaining_bytes_(size - HeaderBytes()) {
// Leave space for header of type/skip.
DCHECK_GE(size, HeaderBytes());
}
PaintOpWriter::~PaintOpWriter() = default;
template <typename T>
void PaintOpWriter::WriteSimple(const T& val) {
static_assert(base::is_trivially_copyable<T>::value, "");
if (!AlignMemory(alignof(T)))
valid_ = false;
if (remaining_bytes_ < sizeof(T))
valid_ = false;
if (!valid_)
return;
reinterpret_cast<T*>(memory_)[0] = val;
memory_ += sizeof(T);
remaining_bytes_ -= sizeof(T);
}
void PaintOpWriter::WriteFlattenable(const SkFlattenable* val) {
DCHECK(SkIsAlign4(reinterpret_cast<uintptr_t>(memory_)))
<< "Flattenable must start writing at 4 byte alignment.";
// TODO(enne): change skia API to make this a const parameter.
sk_sp<SkData> data(
SkValidatingSerializeFlattenable(const_cast<SkFlattenable*>(val)));
Write(data->size());
if (!data->isEmpty())
WriteData(data->size(), data->data());
}
void PaintOpWriter::Write(size_t data) {
WriteSimple(data);
}
void PaintOpWriter::Write(SkScalar data) {
WriteSimple(data);
}
void PaintOpWriter::Write(uint8_t data) {
WriteSimple(data);
}
void PaintOpWriter::Write(const SkRect& rect) {
WriteSimple(rect);
}
void PaintOpWriter::Write(const SkIRect& rect) {
WriteSimple(rect);
}
void PaintOpWriter::Write(const SkRRect& rect) {
WriteSimple(rect);
}
void PaintOpWriter::Write(const SkPath& path) {
size_t bytes = path.writeToMemory(nullptr);
if (bytes > remaining_bytes_)
valid_ = false;
if (!valid_)
return;
path.writeToMemory(memory_);
memory_ += bytes;
remaining_bytes_ -= bytes;
}
void PaintOpWriter::Write(const PaintFlags& flags) {
Write(flags.text_size_);
WriteSimple(flags.color_);
Write(flags.width_);
Write(flags.miter_limit_);
WriteSimple(flags.blend_mode_);
WriteSimple(flags.bitfields_uint_);
// TODO(enne): WriteTypeface, http://crbug.com/737629
// Flattenables must be written starting at a 4 byte boundary, which should be
// the case here.
WriteFlattenable(flags.path_effect_.get());
WriteFlattenable(flags.mask_filter_.get());
WriteFlattenable(flags.color_filter_.get());
WriteFlattenable(flags.draw_looper_.get());
WriteFlattenable(flags.image_filter_.get());
Write(flags.shader_.get());
}
void PaintOpWriter::Write(const PaintImage& image,
ImageProvider* image_provider) {
// TODO(enne): implement PaintImage serialization: http://crbug.com/737629
}
void PaintOpWriter::Write(const sk_sp<SkData>& data) {
if (data.get() && data->size()) {
Write(data->size());
WriteData(data->size(), data->data());
} else {
// Differentiate between nullptr and valid but zero size. It's not clear
// that this happens in practice, but seems better to be consistent.
Write(static_cast<size_t>(0));
Write(!!data.get());
}
}
void PaintOpWriter::Write(const std::vector<PaintTypeface>& typefaces) {
WriteSimple(static_cast<uint32_t>(typefaces.size()));
for (const auto& typeface : typefaces) {
DCHECK(typeface);
WriteSimple(typeface.sk_id());
WriteSimple(static_cast<uint8_t>(typeface.type()));
switch (typeface.type()) {
case PaintTypeface::Type::kTestTypeface:
// Nothing to serialize here.
break;
case PaintTypeface::Type::kSkTypeface:
// Nothing to do here. This should never be the case when everything is
// implemented. This should be a NOTREACHED() eventually.
break;
case PaintTypeface::Type::kFontConfigInterfaceIdAndTtcIndex:
WriteSimple(typeface.font_config_interface_id());
WriteSimple(typeface.ttc_index());
break;
case PaintTypeface::Type::kFilenameAndTtcIndex:
WriteSimple(typeface.filename().size());
WriteData(typeface.filename().size(), typeface.filename().data());
WriteSimple(typeface.ttc_index());
break;
case PaintTypeface::Type::kFamilyNameAndFontStyle:
WriteSimple(typeface.family_name().size());
WriteData(typeface.family_name().size(), typeface.family_name().data());
WriteSimple(typeface.font_style().weight());
WriteSimple(typeface.font_style().width());
WriteSimple(typeface.font_style().slant());
break;
}
#if DCHECK_IS_ON()
if (typeface)
last_serialized_typeface_ids_.insert(typeface.sk_id());
#endif
}
}
// static
void PaintOpWriter::TypefaceCataloger(SkTypeface* typeface, void* ctx) {
DCHECK(static_cast<PaintOpWriter*>(ctx)->last_serialized_typeface_ids_.count(
typeface->uniqueID()) != 0);
}
void PaintOpWriter::Write(const sk_sp<SkTextBlob>& blob) {
auto data = blob->serialize(&PaintOpWriter::TypefaceCataloger, this);
Write(data);
#if DCHECK_IS_ON()
last_serialized_typeface_ids_.clear();
#endif
}
void PaintOpWriter::Write(const scoped_refptr<PaintTextBlob>& blob) {
Write(blob->typefaces());
Write(blob->ToSkTextBlob());
}
void PaintOpWriter::Write(const PaintShader* shader) {
if (!shader) {
WriteSimple(false);
return;
}
// TODO(vmpstr): This could be optimized to only serialize fields relevant to
// the specific shader type. If done, then corresponding reading and tests
// would have to also be updated.
WriteSimple(true);
WriteSimple(shader->shader_type_);
WriteSimple(shader->flags_);
WriteSimple(shader->end_radius_);
WriteSimple(shader->start_radius_);
WriteSimple(shader->tx_);
WriteSimple(shader->ty_);
WriteSimple(shader->fallback_color_);
WriteSimple(shader->scaling_behavior_);
if (shader->local_matrix_) {
Write(true);
WriteSimple(*shader->local_matrix_);
} else {
Write(false);
}
WriteSimple(shader->center_);
WriteSimple(shader->tile_);
WriteSimple(shader->start_point_);
WriteSimple(shader->end_point_);
WriteSimple(shader->start_degrees_);
WriteSimple(shader->end_degrees_);
// TODO(vmpstr): Write PaintImage image_. http://crbug.com/737629
// TODO(vmpstr): Write sk_sp<PaintRecord> record_. http://crbug.com/737629
WriteSimple(shader->colors_.size());
WriteData(shader->colors_.size() * sizeof(SkColor), shader->colors_.data());
WriteSimple(shader->positions_.size());
WriteData(shader->positions_.size() * sizeof(SkScalar),
shader->positions_.data());
// Explicitly don't write the cached_shader_ because that can be regenerated
// using other fields.
}
void PaintOpWriter::WriteData(size_t bytes, const void* input) {
if (bytes > remaining_bytes_)
valid_ = false;
if (!valid_)
return;
if (bytes == 0)
return;
memcpy(memory_, input, bytes);
memory_ += bytes;
remaining_bytes_ -= bytes;
}
void PaintOpWriter::WriteArray(size_t count, const SkPoint* input) {
size_t bytes = sizeof(SkPoint) * count;
WriteData(bytes, input);
}
bool PaintOpWriter::AlignMemory(size_t alignment) {
// Due to the math below, alignment must be a power of two.
DCHECK_GT(alignment, 0u);
DCHECK_EQ(alignment & (alignment - 1), 0u);
uintptr_t memory = reinterpret_cast<uintptr_t>(memory_);
// The following is equivalent to:
// padding = (alignment - memory % alignment) % alignment;
// because alignment is a power of two. This doesn't use modulo operator
// however, since it can be slow.
size_t padding = ((memory + alignment - 1) & ~(alignment - 1)) - memory;
if (padding > remaining_bytes_)
return false;
memory_ += padding;
remaining_bytes_ -= padding;
return true;
}
} // namespace cc