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content / browser / manifest / manifest_icon_downloader.cc [blame]
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/public/browser/manifest_icon_downloader.h"
#include <stddef.h>
#include <limits>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/numerics/safe_conversions.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "skia/ext/image_operations.h"
#include "third_party/blink/public/mojom/devtools/console_message.mojom.h"
namespace content {
bool ManifestIconDownloader::Download(
WebContents* web_contents,
const GURL& icon_url,
int ideal_icon_size_in_px,
int minimum_icon_size_in_px,
int maximum_icon_size_in_px,
IconFetchCallback callback,
bool square_only,
const GlobalRenderFrameHostId& initiator_frame_routing_id) {
DCHECK(minimum_icon_size_in_px <= ideal_icon_size_in_px);
if (!web_contents || !icon_url.is_valid())
return false;
const gfx::Size preferred_size(ideal_icon_size_in_px, ideal_icon_size_in_px);
web_contents->DownloadImageInFrame(
initiator_frame_routing_id, icon_url,
false, // is_favicon
preferred_size, // preferred_size
maximum_icon_size_in_px, // max_bitmap_size - 0 means no maximum size.
false, // bypass_cache
base::BindOnce(&ManifestIconDownloader::OnIconFetched,
ideal_icon_size_in_px, minimum_icon_size_in_px,
square_only, web_contents->GetWeakPtr(),
std::move(callback)));
return true;
}
void ManifestIconDownloader::OnIconFetched(
int ideal_icon_size_in_px,
int minimum_icon_size_in_px,
bool square_only,
base::WeakPtr<WebContents> web_contents,
IconFetchCallback callback,
int id,
int http_status_code,
const GURL& url,
const std::vector<SkBitmap>& bitmaps,
const std::vector<gfx::Size>& sizes) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (bitmaps.empty()) {
if (web_contents) {
web_contents->GetPrimaryMainFrame()->AddMessageToConsole(
blink::mojom::ConsoleMessageLevel::kError,
"Error while trying to use the following icon from the Manifest: " +
url.spec() + " (Download error or resource isn't a valid image)");
}
std::move(callback).Run(SkBitmap());
return;
}
const int closest_index = FindClosestBitmapIndex(
ideal_icon_size_in_px, minimum_icon_size_in_px, square_only, bitmaps);
if (closest_index == -1) {
if (web_contents) {
web_contents->GetPrimaryMainFrame()->AddMessageToConsole(
blink::mojom::ConsoleMessageLevel::kError,
"Error while trying to use the following icon from the Manifest: " +
url.spec() +
" (Resource size is not correct - typo in the Manifest?)");
}
std::move(callback).Run(SkBitmap());
return;
}
const SkBitmap& chosen = bitmaps[closest_index];
float ratio = 1.0;
// Preserve width/height ratio if non-square icons allowed.
if (!square_only && !chosen.empty()) {
ratio = base::checked_cast<float>(chosen.width()) /
base::checked_cast<float>(chosen.height());
}
float ideal_icon_width_in_px = ratio * ideal_icon_size_in_px;
// Only scale if we need to scale down. For scaling up we will let the system
// handle that when it is required to display it. This saves space in the
// webapp storage system as well.
if (chosen.height() > ideal_icon_size_in_px ||
chosen.width() > ideal_icon_width_in_px) {
GetIOThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(&ManifestIconDownloader::ScaleIcon,
ideal_icon_width_in_px, ideal_icon_size_in_px,
chosen, std::move(callback)));
return;
}
std::move(callback).Run(chosen);
}
void ManifestIconDownloader::ScaleIcon(int ideal_icon_width_in_px,
int ideal_icon_height_in_px,
const SkBitmap& bitmap,
IconFetchCallback callback) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
const SkBitmap& scaled = skia::ImageOperations::Resize(
bitmap, skia::ImageOperations::RESIZE_BEST, ideal_icon_width_in_px,
ideal_icon_height_in_px);
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), scaled));
}
int ManifestIconDownloader::FindClosestBitmapIndex(
int ideal_icon_size_in_px,
int minimum_icon_size_in_px,
bool square_only,
const std::vector<SkBitmap>& bitmaps) {
int best_index = -1;
int best_delta = std::numeric_limits<int>::min();
const int max_negative_delta =
minimum_icon_size_in_px - ideal_icon_size_in_px;
for (size_t i = 0; i < bitmaps.size(); ++i) {
if (bitmaps[i].empty())
continue;
// Check for valid width/height ratio.
float width = base::checked_cast<float>(bitmaps[i].width());
float height = base::checked_cast<float>(bitmaps[i].height());
float ratio = width / height;
if (ratio < 1 || ratio > kMaxWidthToHeightRatio)
continue;
if (square_only && ratio != 1)
continue;
int delta = bitmaps[i].height() - ideal_icon_size_in_px;
if (delta == 0)
return i;
if (best_delta > 0 && delta < 0)
continue;
if ((best_delta > 0 && delta < best_delta) ||
(best_delta < 0 && delta > best_delta && delta >= max_negative_delta)) {
best_index = i;
best_delta = delta;
}
}
if (best_index != -1)
return best_index;
// There was no square/landscape icon of a correct size found. Try to find the
// most square-like icon which has both dimensions greater than the minimum
// size.
float best_ratio_difference = std::numeric_limits<float>::infinity();
for (size_t i = 0; i < bitmaps.size(); ++i) {
if (bitmaps[i].height() < minimum_icon_size_in_px ||
bitmaps[i].width() < minimum_icon_size_in_px) {
continue;
}
float height = static_cast<float>(bitmaps[i].height());
float width = static_cast<float>(bitmaps[i].width());
float ratio = width / height;
if (!square_only && ratio > kMaxWidthToHeightRatio)
continue;
float ratio_difference = fabs(ratio - 1);
if (ratio_difference < best_ratio_difference) {
best_index = i;
best_ratio_difference = ratio_difference;
}
}
return best_index;
}
} // namespace content