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// Copyright (c) 2010 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/safe_browsing/phishing_thumbnailer.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/time.h"
#include "content/renderer/render_view.h"
#include "skia/ext/image_operations.h"
#include "skia/ext/platform_canvas.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebRect.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebSize.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
#include "ui/gfx/size.h"
#include "webkit/glue/webkit_glue.h"
using WebKit::WebRect;
using WebKit::WebSize;
using WebKit::WebView;
namespace safe_browsing {
SkBitmap GrabPhishingThumbnail(RenderView* render_view,
const gfx::Size& view_size,
const gfx::Size& thumbnail_size) {
if (!render_view || !render_view->webview()) {
return SkBitmap(); // The WebView is going away.
}
WebView* view = render_view->webview();
base::TimeTicks beginning_time = base::TimeTicks::Now();
skia::PlatformCanvas canvas;
if (!canvas.initialize(view_size.width(), view_size.height(), true)) {
return SkBitmap();
}
// Make sure we are not using any zoom when we take the snapshot. We will
// restore the previous zoom level after the snapshot is taken.
double old_zoom_level = view->zoomLevel();
if (view->zoomLevel() != 0.0) {
view->setZoomLevel(false, 0.0);
}
WebSize old_size = view->size();
// TODO(noelutz): not only should we hide all scroll bars but we should also
// make sure that all scroll-bars are at the top.
view->mainFrame()->setCanHaveScrollbars(false); // always hide scrollbars.
view->resize(view_size);
view->layout();
view->paint(webkit_glue::ToWebCanvas(&canvas),
WebRect(0, 0, view_size.width(), view_size.height()));
SkDevice* device = skia::GetTopDevice(canvas);
// Now resize the thumbnail to the right size. Note: it is important that we
// use this resize algorithm here.
const SkBitmap& bitmap = device->accessBitmap(false);
SkBitmap thumbnail = skia::ImageOperations::Resize(
bitmap,
skia::ImageOperations::RESIZE_LANCZOS3,
thumbnail_size.width(),
thumbnail_size.height());
// Put things back as they were before.
if (view->zoomLevel() != old_zoom_level) {
view->setZoomLevel(false, old_zoom_level);
}
// Maybe re-display the scrollbars and resize the view to its old size.
view->mainFrame()->setCanHaveScrollbars(
render_view->should_display_scrollbars(old_size.width, old_size.height));
view->resize(old_size);
UMA_HISTOGRAM_TIMES("SBClientPhishing.GrabPhishingThumbnail",
base::TimeTicks::Now() - beginning_time);
return thumbnail;
}
} // namespace safe_browsing
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