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// Copyright 2013 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 "gpu/command_buffer/service/gpu_state_tracer.h"
#include "base/base64.h"
#include "base/debug/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::debug::ConvertableToTraceFormat {
public:
static scoped_refptr<Snapshot> Create(const ContextState* state);
// Save a screenshot of the currently bound framebuffer.
bool SaveScreenshot(const gfx::Size& size);
// base::debug::ConvertableToTraceFormat implementation.
virtual void AppendAsTraceFormat(std::string* out) const OVERRIDE;
private:
explicit Snapshot(const ContextState* state);
virtual ~Snapshot() {}
const ContextState* state_;
std::vector<unsigned char> screenshot_pixels_;
gfx::Size screenshot_size_;
DISALLOW_COPY_AND_ASSIGN(Snapshot);
};
} // namespace
Snapshot::Snapshot(const ContextState* state) : state_(state) {}
scoped_refptr<Snapshot> Snapshot::Create(const ContextState* state) {
return scoped_refptr<Snapshot>(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::vector<unsigned char> png_data;
int bytes_per_row = screenshot_size_.width() * kBytesPerPixel;
bool png_ok = gfx::PNGCodec::Encode(&screenshot_pixels_[0],
gfx::PNGCodec::FORMAT_RGBA,
screenshot_size_,
bytes_per_row,
false,
std::vector<gfx::PNGCodec::Comment>(),
&png_data);
DCHECK(png_ok);
base::StringPiece base64_input(reinterpret_cast<const char*>(&png_data[0]),
png_data.size());
std::string base64_output;
Base64Encode(base64_input, &base64_output);
*out += "\"screenshot\":\"" + base64_output + "\"";
}
*out += "}";
}
scoped_ptr<GPUStateTracer> GPUStateTracer::Create(const ContextState* state) {
return scoped_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");
scoped_refptr<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_,
scoped_refptr<base::debug::ConvertableToTraceFormat>(snapshot));
}
} // namespace gles2
} // namespace gpu
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