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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "gpu/command_buffer/service/gpu_state_tracer.h"
#include <string_view>
#include <vector>
#include "base/base64.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/trace_event/trace_event.h"
#include "context_state.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gl/gl_bindings.h"
namespace gpu {
namespace gles2 {
namespace {
const int kBytesPerPixel = 4;
class Snapshot : public base::trace_event::ConvertableToTraceFormat {
public:
static std::unique_ptr<Snapshot> Create(const ContextState* state);
Snapshot(const Snapshot&) = delete;
Snapshot& operator=(const Snapshot&) = delete;
~Snapshot() override = default;
// Save a screenshot of the currently bound framebuffer.
bool SaveScreenshot(const gfx::Size& size);
// base::trace_event::ConvertableToTraceFormat implementation.
void AppendAsTraceFormat(std::string* out) const override;
private:
explicit Snapshot(const ContextState* state);
raw_ptr<const ContextState> state_;
std::vector<unsigned char> screenshot_pixels_;
gfx::Size screenshot_size_;
};
} // namespace
Snapshot::Snapshot(const ContextState* state) : state_(state) {}
std::unique_ptr<Snapshot> Snapshot::Create(const ContextState* state) {
return base::WrapUnique(new Snapshot(state));
}
bool Snapshot::SaveScreenshot(const gfx::Size& size) {
screenshot_size_ = size;
screenshot_pixels_.resize(screenshot_size_.width() *
screenshot_size_.height() * kBytesPerPixel);
glPixelStorei(GL_PACK_ALIGNMENT, kBytesPerPixel);
glReadPixels(0,
0,
screenshot_size_.width(),
screenshot_size_.height(),
GL_RGBA,
GL_UNSIGNED_BYTE,
&screenshot_pixels_[0]);
glPixelStorei(GL_PACK_ALIGNMENT, state_->pack_alignment);
// Flip the screenshot vertically.
int bytes_per_row = screenshot_size_.width() * kBytesPerPixel;
for (int y = 0; y < screenshot_size_.height() / 2; y++) {
for (int x = 0; x < bytes_per_row; x++) {
std::swap(screenshot_pixels_[y * bytes_per_row + x],
screenshot_pixels_
[(screenshot_size_.height() - y - 1) * bytes_per_row + x]);
}
}
return true;
}
void Snapshot::AppendAsTraceFormat(std::string* out) const {
*out += "{";
if (screenshot_pixels_.size()) {
std::optional<std::vector<uint8_t>> png_data = gfx::PNGCodec::Encode(
screenshot_pixels_.data(), gfx::PNGCodec::FORMAT_RGBA, screenshot_size_,
/*row_byte_width=*/screenshot_size_.width() * kBytesPerPixel,
/*discard_transparency=*/false, std::vector<gfx::PNGCodec::Comment>());
DCHECK(png_data);
std::string base64_output =
base::Base64Encode(png_data.value_or(std::vector<uint8_t>()));
*out += "\"screenshot\":\"" + base64_output + "\"";
}
*out += "}";
}
std::unique_ptr<GPUStateTracer> GPUStateTracer::Create(
const ContextState* state) {
return std::unique_ptr<GPUStateTracer>(new GPUStateTracer(state));
}
GPUStateTracer::GPUStateTracer(const ContextState* state) : state_(state) {
TRACE_EVENT_OBJECT_CREATED_WITH_ID(
TRACE_DISABLED_BY_DEFAULT("gpu.debug"), "gpu::State", state_);
}
GPUStateTracer::~GPUStateTracer() {
TRACE_EVENT_OBJECT_DELETED_WITH_ID(
TRACE_DISABLED_BY_DEFAULT("gpu.debug"), "gpu::State", state_);
}
void GPUStateTracer::TakeSnapshotWithCurrentFramebuffer(const gfx::Size& size) {
TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("gpu.debug"),
"GPUStateTracer::TakeSnapshotWithCurrentFramebuffer");
std::unique_ptr<Snapshot> snapshot(Snapshot::Create(state_));
// Only save a screenshot for now.
if (!snapshot->SaveScreenshot(size))
return;
TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(TRACE_DISABLED_BY_DEFAULT("gpu.debug"),
"gpu::State", state_,
std::move(snapshot));
}
} // namespace gles2
} // namespace gpu
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