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// Copyright (c) 2012 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 "chrome/renderer/extensions/chrome_private_custom_bindings.h"
#include <algorithm>
#include <string>
#include <vector>
#include "chrome/common/extensions/extension_action.h"
#include "chrome/renderer/extensions/extension_dispatcher.h"
#include "grit/renderer_resources.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "v8/include/v8.h"
#include "webkit/glue/webkit_glue.h"
namespace extensions {
ChromePrivateCustomBindings::ChromePrivateCustomBindings(
int dependency_count,
const char** dependencies,
ExtensionDispatcher* extension_dispatcher)
: ChromeV8Extension(
"extensions/chrome_private_custom_bindings.js",
IDR_CHROME_PRIVATE_CUSTOM_BINDINGS_JS,
dependency_count,
dependencies,
extension_dispatcher) {}
// static
v8::Handle<v8::Value> ChromePrivateCustomBindings::DecodeJPEG(
const v8::Arguments& args) {
static const char* kAllowedIds[] = {
"haiffjcadagjlijoggckpgfnoeiflnem",
"gnedhmakppccajfpfiihfcdlnpgomkcf",
"fjcibdnjlbfnbfdjneajpipnlcppleek",
"oflbaaikkabfdfkimeclgkackhdkpnip" // Testing extension.
};
const std::vector<std::string> allowed_ids(
kAllowedIds, kAllowedIds + arraysize(kAllowedIds));
ChromePrivateCustomBindings* v8_extension =
GetFromArguments<ChromePrivateCustomBindings>(args);
const ::Extension* extension =
v8_extension->GetExtensionForCurrentRenderView();
if (!extension)
return v8::Undefined();
if (allowed_ids.end() == std::find(
allowed_ids.begin(), allowed_ids.end(), extension->id())) {
return v8::Undefined();
}
DCHECK(args.Length() == 1);
DCHECK(args[0]->IsArray());
v8::Local<v8::Object> jpeg_array = args[0]->ToObject();
size_t jpeg_length =
jpeg_array->Get(v8::String::New("length"))->Int32Value();
// Put input JPEG array into string for DecodeImage().
std::string jpeg_array_string;
jpeg_array_string.reserve(jpeg_length);
// Unfortunately we cannot request continuous backing store of the
// |jpeg_array| object as it might not have one. So we make
// element copy here.
// Note(mnaganov): If it is not fast enough
// (and main constraints might be in repetition of v8 API calls),
// change the argument type from Array to String and use
// String::Write().
// Note(vitalyr): Another option is to use Int8Array for inputs and
// Int32Array for output.
for (size_t i = 0; i != jpeg_length; ++i) {
jpeg_array_string.push_back(
jpeg_array->Get(v8::Integer::New(i))->Int32Value());
}
// Decode and verify resulting image metrics.
SkBitmap bitmap;
if (!webkit_glue::DecodeImage(jpeg_array_string, &bitmap))
return v8::Undefined();
if (bitmap.config() != SkBitmap::kARGB_8888_Config)
return v8::Undefined();
const int width = bitmap.width();
const int height = bitmap.height();
SkAutoLockPixels lockpixels(bitmap);
const uint32_t* pixels = static_cast<uint32_t*>(bitmap.getPixels());
if (!pixels)
return v8::Undefined();
// Compose output array. This API call only accepts kARGB_8888_Config images
// so we rely on each pixel occupying 4 bytes.
// Note(mnaganov): to speed this up, you may use backing store
// technique from CreateExternalArray() of v8/src/d8.cc.
v8::Local<v8::Array> bitmap_array(v8::Array::New(width * height));
for (int i = 0; i != width * height; ++i) {
bitmap_array->Set(v8::Integer::New(i),
v8::Integer::New(pixels[i] & 0xFFFFFF));
}
return bitmap_array;
}
v8::Handle<v8::FunctionTemplate> ChromePrivateCustomBindings::GetNativeFunction(
v8::Handle<v8::String> name) {
if (name->Equals(v8::String::New("DecodeJPEG")))
return v8::FunctionTemplate::New(DecodeJPEG, v8::External::New(this));
return ChromeV8Extension::GetNativeFunction(name);
}
} // namespace extensions
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