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// Copyright (c) 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 "ash/desktop_background/wallpaper_resizer.h"
#include "ash/desktop_background/wallpaper_resizer_observer.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/threading/sequenced_worker_pool.h"
#include "base/threading/worker_pool.h"
#include "content/public/browser/browser_thread.h"
#include "third_party/skia/include/core/SkImage.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/gfx/skia_util.h"
using content::BrowserThread;
namespace ash {
namespace {
// For our scaling ratios we need to round positive numbers.
int RoundPositive(double x) {
return static_cast<int>(floor(x + 0.5));
}
// Resizes |orig_bitmap| to |target_size| using |layout| and stores the
// resulting bitmap at |resized_bitmap_out|.
void Resize(SkBitmap orig_bitmap,
const gfx::Size& target_size,
WallpaperLayout layout,
SkBitmap* resized_bitmap_out) {
DCHECK(BrowserThread::GetBlockingPool()->RunsTasksOnCurrentThread());
SkBitmap new_bitmap = orig_bitmap;
const int orig_width = orig_bitmap.width();
const int orig_height = orig_bitmap.height();
const int new_width = target_size.width();
const int new_height = target_size.height();
if (orig_width > new_width || orig_height > new_height) {
gfx::Rect wallpaper_rect(0, 0, orig_width, orig_height);
gfx::Size cropped_size = gfx::Size(std::min(new_width, orig_width),
std::min(new_height, orig_height));
switch (layout) {
case WALLPAPER_LAYOUT_CENTER:
wallpaper_rect.ClampToCenteredSize(cropped_size);
orig_bitmap.extractSubset(&new_bitmap,
gfx::RectToSkIRect(wallpaper_rect));
break;
case WALLPAPER_LAYOUT_TILE:
wallpaper_rect.set_size(cropped_size);
orig_bitmap.extractSubset(&new_bitmap,
gfx::RectToSkIRect(wallpaper_rect));
break;
case WALLPAPER_LAYOUT_STRETCH:
new_bitmap = skia::ImageOperations::Resize(
orig_bitmap, skia::ImageOperations::RESIZE_LANCZOS3,
new_width, new_height);
break;
case WALLPAPER_LAYOUT_CENTER_CROPPED:
if (orig_width > new_width && orig_height > new_height) {
// The dimension with the smallest ratio must be cropped, the other
// one is preserved. Both are set in gfx::Size cropped_size.
double horizontal_ratio = static_cast<double>(new_width) /
static_cast<double>(orig_width);
double vertical_ratio = static_cast<double>(new_height) /
static_cast<double>(orig_height);
if (vertical_ratio > horizontal_ratio) {
cropped_size = gfx::Size(
RoundPositive(static_cast<double>(new_width) / vertical_ratio),
orig_height);
} else {
cropped_size = gfx::Size(orig_width, RoundPositive(
static_cast<double>(new_height) / horizontal_ratio));
}
wallpaper_rect.ClampToCenteredSize(cropped_size);
SkBitmap sub_image;
orig_bitmap.extractSubset(&sub_image,
gfx::RectToSkIRect(wallpaper_rect));
new_bitmap = skia::ImageOperations::Resize(
sub_image, skia::ImageOperations::RESIZE_LANCZOS3,
new_width, new_height);
}
}
}
*resized_bitmap_out = new_bitmap;
resized_bitmap_out->setImmutable();
}
} // namespace
// static
uint32_t WallpaperResizer::GetImageId(const gfx::ImageSkia& image) {
const gfx::ImageSkiaRep& image_rep = image.GetRepresentation(1.0f);
return image_rep.is_null() ? 0 : image_rep.sk_bitmap().getGenerationID();
}
WallpaperResizer::WallpaperResizer(const gfx::ImageSkia& image,
const gfx::Size& target_size,
WallpaperLayout layout)
: image_(image),
original_image_id_(GetImageId(image_)),
target_size_(target_size),
layout_(layout),
weak_ptr_factory_(this) {
image_.MakeThreadSafe();
}
WallpaperResizer::~WallpaperResizer() {
}
void WallpaperResizer::StartResize() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
SkBitmap* resized_bitmap = new SkBitmap;
if (!content::BrowserThread::PostBlockingPoolTaskAndReply(
FROM_HERE,
base::Bind(&Resize, *image_.bitmap(), target_size_,
layout_, resized_bitmap),
base::Bind(&WallpaperResizer::OnResizeFinished,
weak_ptr_factory_.GetWeakPtr(),
base::Owned(resized_bitmap)))) {
LOG(WARNING) << "PostSequencedWorkerTask failed. "
<< "Wallpaper may not be resized.";
}
}
void WallpaperResizer::AddObserver(WallpaperResizerObserver* observer) {
observers_.AddObserver(observer);
}
void WallpaperResizer::RemoveObserver(WallpaperResizerObserver* observer) {
observers_.RemoveObserver(observer);
}
void WallpaperResizer::OnResizeFinished(SkBitmap* resized_bitmap) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
image_ = gfx::ImageSkia::CreateFrom1xBitmap(*resized_bitmap);
FOR_EACH_OBSERVER(WallpaperResizerObserver, observers_,
OnWallpaperResized());
}
} // namespace ash
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