blob: 164406abf57cea6c93ba999486152cb5e333340b [file] [log] [blame]
// Copyright 2015 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 "content/renderer/image_downloader/image_downloader_impl.h"
#include <utility>
#include "base/bind.h"
#include "base/logging.h"
#include "content/public/renderer/render_frame.h"
#include "skia/ext/image_operations.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/skbitmap_operations.h"
namespace {
// Proportionally resizes the |image| to fit in a box of size
// |max_image_size|.
SkBitmap ResizeImage(const SkBitmap& image, uint32_t max_image_size) {
if (max_image_size == 0)
return image;
uint32_t max_dimension = std::max(image.width(), image.height());
if (max_dimension <= max_image_size)
return image;
// Proportionally resize the minimal image to fit in a box of size
// max_image_size.
return skia::ImageOperations::Resize(
image, skia::ImageOperations::RESIZE_BEST,
static_cast<uint64_t>(image.width()) * max_image_size / max_dimension,
static_cast<uint64_t>(image.height()) * max_image_size / max_dimension);
// Filters the array of bitmaps, removing all images that do not fit in a box of
// size |max_image_size|. Returns the result if it is not empty. Otherwise,
// find the smallest image in the array and resize it proportionally to fit
// in a box of size |max_image_size|.
// Sets |original_image_sizes| to the sizes of |images| before resizing.
void FilterAndResizeImagesForMaximalSize(
const std::vector<SkBitmap>& unfiltered,
uint32_t max_image_size,
std::vector<SkBitmap>* images,
std::vector<gfx::Size>* original_image_sizes) {
if (unfiltered.empty())
if (max_image_size == 0)
max_image_size = std::numeric_limits<uint32_t>::max();
const SkBitmap* min_image = nullptr;
uint32_t min_image_size = std::numeric_limits<uint32_t>::max();
// Filter the images by |max_image_size|, and also identify the smallest image
// in case all the images are bigger than |max_image_size|.
for (auto it = unfiltered.begin(); it != unfiltered.end(); ++it) {
const SkBitmap& image = *it;
uint32_t current_size = std::max(it->width(), it->height());
if (current_size < min_image_size) {
min_image = &image;
min_image_size = current_size;
if (static_cast<uint32_t>(image.width()) <= max_image_size &&
static_cast<uint32_t>(image.height()) <= max_image_size) {
original_image_sizes->push_back(gfx::Size(image.width(), image.height()));
if (images->size())
// Proportionally resize the minimal image to fit in a box of size
// |max_image_size|.
SkBitmap resized = ResizeImage(*min_image, max_image_size);
// Drop null or empty SkBitmap.
if (resized.drawsNothing())
gfx::Size(min_image->width(), min_image->height()));
} // namespace
namespace content {
ImageDownloaderImpl::ImageDownloaderImpl(RenderFrame* render_frame,
mojom::ImageDownloaderRequest request)
: ImageDownloaderBase(render_frame), binding_(this, std::move(request)) {
base::BindOnce(&ImageDownloaderImpl::OnDestruct, base::Unretained(this)));
ImageDownloaderImpl::~ImageDownloaderImpl() {}
// static
void ImageDownloaderImpl::CreateMojoService(
RenderFrame* render_frame,
mojom::ImageDownloaderRequest request) {
DVLOG(1) << "ImageDownloaderImpl::CreateMojoService";
// Owns itself. Will be deleted when message pipe is destroyed or RenderFrame
// is destructed.
new ImageDownloaderImpl(render_frame, std::move(request));
// ImageDownloader methods:
void ImageDownloaderImpl::DownloadImage(const GURL& image_url,
bool is_favicon,
uint32_t max_bitmap_size,
bool bypass_cache,
DownloadImageCallback callback) {
std::vector<SkBitmap> result_images;
std::vector<gfx::Size> result_original_image_sizes;
image_url, is_favicon, bypass_cache,
base::Unretained(this), max_bitmap_size,
void ImageDownloaderImpl::DidDownloadImage(
uint32_t max_image_size,
DownloadImageCallback callback,
int32_t http_status_code,
const std::vector<SkBitmap>& images) {
std::vector<SkBitmap> result_images;
std::vector<gfx::Size> result_original_image_sizes;
FilterAndResizeImagesForMaximalSize(images, max_image_size, &result_images,
std::move(callback).Run(http_status_code, result_images,
void ImageDownloaderImpl::OnDestruct() {
delete this;
} // namespace content