Cleanup: Removing obsolete chromePrivate.decodeJPEG API.

chrome/renderer/extensions/chrome_private_custom_bindings.cc

-// 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(
-    ExtensionDispatcher* extension_dispatcher)
-    : ChromeV8Extension(extension_dispatcher) {
-  RouteStaticFunction("DecodeJPEG", &DecodeJPEG);
-}
-
-// static
-v8::Handle<v8::Value> ChromePrivateCustomBindings::DecodeJPEG(
-    const v8::Arguments& args) {
-  ChromePrivateCustomBindings* v8_extension =
-      GetFromArguments<ChromePrivateCustomBindings>(args);
-  const ::Extension* extension =
-      v8_extension->GetExtensionForCurrentRenderView();
-  if (!extension)
-    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;
-}
-
-}  // namespace extensions