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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 "extensions/browser/api/web_contents_capture_client.h"
#include "base/base64.h"
#include "base/strings/stringprintf.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/browser/web_contents.h"
#include "extensions/browser/extension_function.h"
#include "extensions/common/constants.h"
#include "ui/gfx/codec/jpeg_codec.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/display.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/screen.h"
using content::RenderWidgetHost;
using content::RenderWidgetHostView;
using content::WebContents;
namespace extensions {
using api::extension_types::ImageDetails;
bool WebContentsCaptureClient::CaptureAsync(
WebContents* web_contents,
const ImageDetails* image_details,
const content::ReadbackRequestCallback callback) {
if (!web_contents)
return false;
if (!IsScreenshotEnabled())
return false;
// The default format and quality setting used when encoding jpegs.
const api::extension_types::ImageFormat kDefaultFormat =
api::extension_types::IMAGE_FORMAT_JPEG;
const int kDefaultQuality = 90;
image_format_ = kDefaultFormat;
image_quality_ = kDefaultQuality;
if (image_details) {
if (image_details->format != api::extension_types::IMAGE_FORMAT_NONE)
image_format_ = image_details->format;
if (image_details->quality.get())
image_quality_ = *image_details->quality;
}
// TODO(miu): Account for fullscreen render widget? http://crbug.com/419878
RenderWidgetHostView* const view = web_contents->GetRenderWidgetHostView();
RenderWidgetHost* const host = view ? view->GetRenderWidgetHost() : nullptr;
if (!view || !host) {
OnCaptureFailure(FAILURE_REASON_VIEW_INVISIBLE);
return false;
}
// By default, the requested bitmap size is the view size in screen
// coordinates. However, if there's more pixel detail available on the
// current system, increase the requested bitmap size to capture it all.
const gfx::Size view_size = view->GetViewBounds().size();
gfx::Size bitmap_size = view_size;
const gfx::NativeView native_view = view->GetNativeView();
gfx::Screen* const screen = gfx::Screen::GetScreen();
const float scale =
screen->GetDisplayNearestWindow(native_view).device_scale_factor();
if (scale > 1.0f)
bitmap_size = gfx::ScaleToCeiledSize(view_size, scale);
host->CopyFromBackingStore(gfx::Rect(view_size), bitmap_size, callback,
kN32_SkColorType);
return true;
}
void WebContentsCaptureClient::CopyFromBackingStoreComplete(
const SkBitmap& bitmap,
content::ReadbackResponse response) {
if (response == content::READBACK_SUCCESS) {
OnCaptureSuccess(bitmap);
return;
}
// TODO(wjmaclean): Improve error reporting. Why aren't we passing more
// information here?
std::string reason;
switch (response) {
case content::READBACK_FAILED:
reason = "READBACK_FAILED";
break;
case content::READBACK_SURFACE_UNAVAILABLE:
reason = "READBACK_SURFACE_UNAVAILABLE";
break;
case content::READBACK_BITMAP_ALLOCATION_FAILURE:
reason = "READBACK_BITMAP_ALLOCATION_FAILURE";
break;
default:
reason = "<unknown>";
}
OnCaptureFailure(FAILURE_REASON_UNKNOWN);
}
// TODO(wjmaclean) can this be static?
bool WebContentsCaptureClient::EncodeBitmap(const SkBitmap& bitmap,
std::string* base64_result) {
DCHECK(base64_result);
std::vector<unsigned char> data;
SkAutoLockPixels screen_capture_lock(bitmap);
bool encoded = false;
std::string mime_type;
switch (image_format_) {
case api::extension_types::IMAGE_FORMAT_JPEG:
encoded = gfx::JPEGCodec::Encode(
reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(), bitmap.height(),
static_cast<int>(bitmap.rowBytes()), image_quality_, &data);
mime_type = kMimeTypeJpeg;
break;
case api::extension_types::IMAGE_FORMAT_PNG:
encoded =
gfx::PNGCodec::EncodeBGRASkBitmap(bitmap,
true, // Discard transparency.
&data);
mime_type = kMimeTypePng;
break;
default:
NOTREACHED() << "Invalid image format.";
}
if (!encoded)
return false;
base::StringPiece stream_as_string(reinterpret_cast<const char*>(data.data()),
data.size());
base::Base64Encode(stream_as_string, base64_result);
base64_result->insert(
0, base::StringPrintf("data:%s;base64,", mime_type.c_str()));
return true;
}
} // namespace extensions
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