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// Copyright (c) 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 "content/renderer/skia_benchmarking_extension.h"
#include "base/values.h"
#include "cc/resources/picture.h"
#include "content/public/renderer/v8_value_converter.h"
#include "third_party/WebKit/public/web/WebArrayBuffer.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkColorPriv.h"
#include "third_party/skia/include/core/SkGraphics.h"
#include "ui/gfx/rect_conversions.h"
#include "v8/include/v8.h"
using WebKit::WebFrame;
namespace {
const char kSkiaBenchmarkingExtensionName[] = "v8/SkiaBenchmarking";
class SkiaBenchmarkingWrapper : public v8::Extension {
public:
SkiaBenchmarkingWrapper() :
v8::Extension(kSkiaBenchmarkingExtensionName,
"if (typeof(chrome) == 'undefined') {"
" chrome = {};"
"};"
"if (typeof(chrome.skiaBenchmarking) == 'undefined') {"
" chrome.skiaBenchmarking = {};"
"};"
"chrome.skiaBenchmarking.rasterize = function(picture, scale, rect) {"
" /* "
" Rasterizes a Picture JSON-encoded by cc::Picture::AsValue()."
" @param {Object} picture A json-encoded cc::Picture."
" @param {Number} scale (optional) Rendering scale."
" @param [Number, Number, Number, Number] clip_rect (optional)."
" @returns { 'width': {Number}, 'height': {Number},"
" 'data': {ArrayBuffer} }"
" */"
" native function Rasterize();"
" return Rasterize(picture, scale, rect);"
"};"
) {
content::SkiaBenchmarkingExtension::InitSkGraphics();
}
virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
v8::Handle<v8::String> name) OVERRIDE {
if (name->Equals(v8::String::New("Rasterize")))
return v8::FunctionTemplate::New(Rasterize);
return v8::Handle<v8::FunctionTemplate>();
}
static void Rasterize(const v8::FunctionCallbackInfo<v8::Value>& args) {
if (args.Length() < 1)
return;
WebFrame* web_frame = WebFrame::frameForCurrentContext();
if (!web_frame)
return;
scoped_ptr<content::V8ValueConverter> converter(
content::V8ValueConverter::create());
v8::String::Value v8_picture(args[0]);
scoped_ptr<base::Value> picture_value(
converter->FromV8Value(
args[0], v8::Context::GetCurrent()));
if (!picture_value)
return;
scoped_refptr<cc::Picture> picture =
cc::Picture::CreateFromValue(picture_value.get());
if (!picture.get())
return;
float scale = 1.0f;
if (args.Length() > 1 && args[1]->IsNumber())
scale = std::max(0.01, std::min(100.0, args[1]->NumberValue()));
gfx::RectF clip(picture->LayerRect());
if (args.Length() > 2 && args[2]->IsArray()) {
v8::Array* a = v8::Array::Cast(*args[2]);
if (a->Length() == 4
&& a->Get(0)->IsNumber()
&& a->Get(1)->IsNumber()
&& a->Get(2)->IsNumber()
&& a->Get(3)->IsNumber()) {
clip.SetRect(a->Get(0)->NumberValue(), a->Get(1)->NumberValue(),
a->Get(2)->NumberValue(), a->Get(3)->NumberValue());
clip.Intersect(picture->LayerRect());
}
}
// cc::Picture::Raster() clips before scaling, so the clip needs to be
// scaled explicitly.
clip.Scale(scale);
gfx::Rect snapped_clip = gfx::ToEnclosingRect(clip);
const int kMaxBitmapSize = 4096;
if (snapped_clip.width() > kMaxBitmapSize
|| snapped_clip.height() > kMaxBitmapSize)
return;
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kARGB_8888_Config, snapped_clip.width(),
snapped_clip.height());
if (!bitmap.allocPixels())
return;
bitmap.eraseARGB(0, 0, 0, 0);
SkCanvas canvas(bitmap);
canvas.translate(SkFloatToScalar(-clip.x()),
SkFloatToScalar(-clip.y()));
picture->Raster(&canvas, NULL, snapped_clip, scale);
WebKit::WebArrayBuffer buffer =
WebKit::WebArrayBuffer::create(bitmap.getSize(), 1);
uint32* packed_pixels = reinterpret_cast<uint32*>(bitmap.getPixels());
uint8* buffer_pixels = reinterpret_cast<uint8*>(buffer.data());
// Swizzle from native Skia format to RGBA as we copy out.
for (size_t i = 0; i < bitmap.getSize(); i += 4) {
uint32 c = packed_pixels[i >> 2];
buffer_pixels[i] = SkGetPackedR32(c);
buffer_pixels[i + 1] = SkGetPackedG32(c);
buffer_pixels[i + 2] = SkGetPackedB32(c);
buffer_pixels[i + 3] = SkGetPackedA32(c);
}
v8::Handle<v8::Object> result = v8::Object::New();
result->Set(v8::String::New("width"),
v8::Number::New(snapped_clip.width()));
result->Set(v8::String::New("height"),
v8::Number::New(snapped_clip.height()));
result->Set(v8::String::New("data"), buffer.toV8Value());
args.GetReturnValue().Set(result);
}
};
} // namespace
namespace content {
v8::Extension* SkiaBenchmarkingExtension::Get() {
return new SkiaBenchmarkingWrapper();
}
void SkiaBenchmarkingExtension::InitSkGraphics() {
// Always call on the main render thread.
// Does not need to be thread-safe, as long as the above holds.
// FIXME: remove this after Skia updates SkGraphics::Init() to be
// thread-safe and idempotent.
static bool skia_initialized = false;
if (!skia_initialized) {
SkGraphics::Init();
skia_initialized = true;
}
}
} // namespace content
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