extensions/renderer/set_icon_natives.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/renderer/set_icon_natives.h"
   6
   7 #include <limits>
   8
   9 #include "base/memory/scoped_ptr.h"
  10 #include "content/public/common/common_param_traits.h"
  11 #include "extensions/renderer/request_sender.h"
  12 #include "extensions/renderer/script_context.h"
  13 #include "ipc/ipc_message_utils.h"
  14 #include "third_party/WebKit/public/web/WebArrayBufferConverter.h"
  15 #include "third_party/skia/include/core/SkBitmap.h"
  16 #include "ui/gfx/ipc/gfx_param_traits.h"
  17
  18 namespace {
  19
  20 const char* kImageSizeKeys[] = {"19", "38"};
  21 const char kInvalidDimensions[] = "ImageData has invalid dimensions.";
  22 const char kInvalidData[] = "ImageData data length does not match dimensions.";
  23 const char kNoMemory[] = "Chrome was unable to initialize icon.";
  24
  25 }  // namespace
  26
  27 namespace extensions {
  28
  29 SetIconNatives::SetIconNatives(ScriptContext* context)
  30     : ObjectBackedNativeHandler(context) {
  31   RouteFunction(
  32       "SetIconCommon",
  33       base::Bind(&SetIconNatives::SetIconCommon, base::Unretained(this)));
  34 }
  35
  36 bool SetIconNatives::ConvertImageDataToBitmapValue(
  37     const v8::Local<v8::Object> image_data,
  38     v8::Local<v8::Value>* image_data_bitmap) {
  39   v8::Isolate* isolate = context()->v8_context()->GetIsolate();
  40   v8::Local<v8::Object> data =
  41       image_data->Get(v8::String::NewFromUtf8(isolate, "data"))
  42           ->ToObject(isolate);
  43   int width =
  44       image_data->Get(v8::String::NewFromUtf8(isolate, "width"))->Int32Value();
  45   int height =
  46       image_data->Get(v8::String::NewFromUtf8(isolate, "height"))->Int32Value();
  47
  48   if (width <= 0 || height <= 0) {
  49     isolate->ThrowException(v8::Exception::Error(
  50         v8::String::NewFromUtf8(isolate, kInvalidDimensions)));
  51     return false;
  52   }
  53
  54   // We need to be able to safely check |data_length| == 4 * width * height
  55   // without overflowing below.
  56   int max_width = (std::numeric_limits<int>::max() / 4) / height;
  57   if (width > max_width) {
  58     isolate->ThrowException(v8::Exception::Error(
  59         v8::String::NewFromUtf8(isolate, kInvalidDimensions)));
  60     return false;
  61   }
  62
  63   int data_length =
  64       data->Get(v8::String::NewFromUtf8(isolate, "length"))->Int32Value();
  65   if (data_length != 4 * width * height) {
  66     isolate->ThrowException(
  67         v8::Exception::Error(v8::String::NewFromUtf8(isolate, kInvalidData)));
  68     return false;
  69   }
  70
  71   SkBitmap bitmap;
  72   if (!bitmap.tryAllocN32Pixels(width, height)) {
  73     isolate->ThrowException(
  74         v8::Exception::Error(v8::String::NewFromUtf8(isolate, kNoMemory)));
  75     return false;
  76   }
  77   bitmap.eraseARGB(0, 0, 0, 0);
  78
  79   uint32_t* pixels = bitmap.getAddr32(0, 0);
  80   for (int t = 0; t < width * height; t++) {
  81     // |data| is RGBA, pixels is ARGB.
  82     pixels[t] = SkPreMultiplyColor(
  83         ((data->Get(v8::Integer::New(isolate, 4 * t + 3))->Int32Value() & 0xFF)
  84          << 24) |
  85         ((data->Get(v8::Integer::New(isolate, 4 * t + 0))->Int32Value() & 0xFF)
  86          << 16) |
  87         ((data->Get(v8::Integer::New(isolate, 4 * t + 1))->Int32Value() & 0xFF)
  88          << 8) |
  89         ((data->Get(v8::Integer::New(isolate, 4 * t + 2))->Int32Value() & 0xFF)
  90          << 0));
  91   }
  92
  93   // Construct the Value object.
  94   IPC::Message bitmap_pickle;
  95   IPC::WriteParam(&bitmap_pickle, bitmap);
  96   blink::WebArrayBuffer buffer =
  97       blink::WebArrayBuffer::create(bitmap_pickle.size(), 1);
  98   memcpy(buffer.data(), bitmap_pickle.data(), bitmap_pickle.size());
  99   *image_data_bitmap = blink::WebArrayBufferConverter::toV8Value(
 100       &buffer, context()->v8_context()->Global(), isolate);
 101
 102   return true;
 103 }
 104
 105 bool SetIconNatives::ConvertImageDataSetToBitmapValueSet(
 106     v8::Local<v8::Object>& details,
 107     v8::Local<v8::Object>* bitmap_set_value) {
 108   v8::Isolate* isolate = context()->v8_context()->GetIsolate();
 109   v8::Local<v8::Object> image_data_set =
 110       details->Get(v8::String::NewFromUtf8(isolate, "imageData"))
 111           ->ToObject(isolate);
 112
 113   DCHECK(bitmap_set_value);
 114   for (size_t i = 0; i < arraysize(kImageSizeKeys); i++) {
 115     if (!image_data_set->Has(
 116             v8::String::NewFromUtf8(isolate, kImageSizeKeys[i])))
 117       continue;
 118     v8::Local<v8::Object> image_data =
 119         image_data_set->Get(v8::String::NewFromUtf8(isolate, kImageSizeKeys[i]))
 120             ->ToObject(isolate);
 121     v8::Local<v8::Value> image_data_bitmap;
 122     if (!ConvertImageDataToBitmapValue(image_data, &image_data_bitmap))
 123       return false;
 124     (*bitmap_set_value)->Set(
 125         v8::String::NewFromUtf8(isolate, kImageSizeKeys[i]), image_data_bitmap);
 126   }
 127   return true;
 128 }
 129
 130 void SetIconNatives::SetIconCommon(
 131     const v8::FunctionCallbackInfo<v8::Value>& args) {
 132   CHECK_EQ(1, args.Length());
 133   CHECK(args[0]->IsObject());
 134   v8::Local<v8::Object> details = args[0]->ToObject(args.GetIsolate());
 135   v8::Local<v8::Object> bitmap_set_value(v8::Object::New(args.GetIsolate()));
 136   if (!ConvertImageDataSetToBitmapValueSet(details, &bitmap_set_value))
 137     return;
 138
 139   v8::Local<v8::Object> dict(v8::Object::New(args.GetIsolate()));
 140   dict->Set(v8::String::NewFromUtf8(args.GetIsolate(), "imageData"),
 141             bitmap_set_value);
 142   if (details->Has(v8::String::NewFromUtf8(args.GetIsolate(), "tabId"))) {
 143     dict->Set(
 144         v8::String::NewFromUtf8(args.GetIsolate(), "tabId"),
 145         details->Get(v8::String::NewFromUtf8(args.GetIsolate(), "tabId")));
 146   }
 147   args.GetReturnValue().Set(dict);
 148 }
 149
 150 }  // namespace extensions