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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/thumbnail/generator/thumbnail_util.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/task/thread_pool.h"
#include "content/public/browser/browser_thread.h"
#include "skia/ext/image_operations.h"
namespace {
SkBitmap ScaleDownBitmapOnIOThread(int icon_size, SkBitmap bitmap) {
DCHECK(!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
if (bitmap.drawsNothing())
return bitmap;
// Shrink the image down so that its smallest dimension is equal to or
// smaller than the requested size.
int min_dimension = std::min(bitmap.width(), bitmap.height());
if (min_dimension <= icon_size)
return bitmap;
uint64_t width = static_cast<uint64_t>(bitmap.width());
uint64_t height = static_cast<uint64_t>(bitmap.height());
return skia::ImageOperations::Resize(
bitmap, skia::ImageOperations::RESIZE_BEST,
width * icon_size / min_dimension, height * icon_size / min_dimension);
}
} // namespace
void ScaleDownBitmap(int icon_size,
const SkBitmap& bitmap,
base::OnceCallback<void(SkBitmap)> callback) {
DCHECK(callback);
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
// Scale down bitmap on another thread.
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_BLOCKING},
base::BindOnce(&ScaleDownBitmapOnIOThread, icon_size, std::move(bitmap)),
std::move(callback));
}
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