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// Copyright 2014 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 "components/favicon_base/favicon_util.h"
#include <stddef.h>
#include <cmath>
#include "build/build_config.h"
#include "components/favicon_base/favicon_types.h"
#include "components/favicon_base/select_favicon_frames.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "ui/base/layout.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/favicon_size.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/image/image_png_rep.h"
#include "ui/gfx/image/image_skia.h"
#if defined(OS_MACOSX) && !defined(OS_IOS)
#include "base/mac/mac_util.h"
#endif // defined(OS_MACOSX) && !defined(OS_IOS)
namespace favicon_base {
namespace {
// Creates image reps of DIP size |favicon_size| for the subset of
// |favicon_scales| for which the image reps can be created without resizing
// or decoding the bitmap data.
std::vector<gfx::ImagePNGRep> SelectFaviconFramesFromPNGsWithoutResizing(
const std::vector<favicon_base::FaviconRawBitmapResult>& png_data,
const std::vector<float>& favicon_scales,
int favicon_size) {
std::vector<gfx::ImagePNGRep> png_reps;
if (png_data.empty())
return png_reps;
// A |favicon_size| of 0 indicates that the largest frame is desired.
if (favicon_size == 0) {
int maximum_area = 0;
scoped_refptr<base::RefCountedMemory> best_candidate;
for (size_t i = 0; i < png_data.size(); ++i) {
int area = png_data[i].pixel_size.GetArea();
if (area > maximum_area) {
maximum_area = area;
best_candidate = png_data[i].bitmap_data;
}
}
png_reps.push_back(gfx::ImagePNGRep(best_candidate, 1.0f));
return png_reps;
}
// Build a map which will be used to determine the scale used to
// create a bitmap with given pixel size.
std::map<int, float> desired_pixel_sizes;
for (size_t i = 0; i < favicon_scales.size(); ++i) {
int pixel_size =
static_cast<int>(std::ceil(favicon_size * favicon_scales[i]));
desired_pixel_sizes[pixel_size] = favicon_scales[i];
}
for (size_t i = 0; i < png_data.size(); ++i) {
if (!png_data[i].is_valid())
continue;
const gfx::Size& pixel_size = png_data[i].pixel_size;
if (pixel_size.width() != pixel_size.height())
continue;
std::map<int, float>::iterator it =
desired_pixel_sizes.find(pixel_size.width());
if (it == desired_pixel_sizes.end())
continue;
png_reps.push_back(gfx::ImagePNGRep(png_data[i].bitmap_data, it->second));
}
return png_reps;
}
// Returns a resampled bitmap of |desired_size| x |desired_size| by resampling
// the best bitmap out of |input_bitmaps|.
// ResizeBitmapByDownsamplingIfPossible() is similar to SelectFaviconFrames()
// but it operates on bitmaps which have already been resampled via
// SelectFaviconFrames().
SkBitmap ResizeBitmapByDownsamplingIfPossible(
const std::vector<SkBitmap>& input_bitmaps,
int desired_size) {
DCHECK(!input_bitmaps.empty());
DCHECK_NE(0, desired_size);
SkBitmap best_bitmap;
for (size_t i = 0; i < input_bitmaps.size(); ++i) {
const SkBitmap& input_bitmap = input_bitmaps[i];
if (input_bitmap.width() == desired_size &&
input_bitmap.height() == desired_size) {
return input_bitmap;
} else if (best_bitmap.isNull()) {
best_bitmap = input_bitmap;
} else if (input_bitmap.width() >= best_bitmap.width() &&
input_bitmap.height() >= best_bitmap.height()) {
if (best_bitmap.width() < desired_size ||
best_bitmap.height() < desired_size) {
best_bitmap = input_bitmap;
}
} else {
if (input_bitmap.width() >= desired_size &&
input_bitmap.height() >= desired_size) {
best_bitmap = input_bitmap;
}
}
}
if (desired_size % best_bitmap.width() == 0 &&
desired_size % best_bitmap.height() == 0) {
// Use nearest neighbour resampling if upsampling by an integer. This
// makes the result look similar to the result of SelectFaviconFrames().
SkBitmap bitmap;
bitmap.allocN32Pixels(desired_size, desired_size);
if (!best_bitmap.isOpaque())
bitmap.eraseARGB(0, 0, 0, 0);
SkCanvas canvas(bitmap);
canvas.drawBitmapRect(
best_bitmap, SkRect::MakeIWH(desired_size, desired_size), NULL);
return bitmap;
}
return skia::ImageOperations::Resize(best_bitmap,
skia::ImageOperations::RESIZE_LANCZOS3,
desired_size,
desired_size);
}
} // namespace
std::vector<float> GetFaviconScales() {
const float kScale1x = 1.0f;
std::vector<ui::ScaleFactor> resource_scale_factors =
ui::GetSupportedScaleFactors();
// TODO(ios): 1.0f should not be necessary on iOS retina devices. However
// the sync service only supports syncing 100p favicons. Until sync supports
// other scales 100p is needed in the list of scales to retrieve and
// store the favicons in both 100p for sync and 200p for display. cr/160503.
std::vector<float> favicon_scales(1, kScale1x);
for (size_t i = 0; i < resource_scale_factors.size(); ++i) {
if (resource_scale_factors[i] != ui::SCALE_FACTOR_100P)
favicon_scales.push_back(
ui::GetScaleForScaleFactor(resource_scale_factors[i]));
}
return favicon_scales;
}
void SetFaviconColorSpace(gfx::Image* image) {
#if defined(OS_MACOSX) && !defined(OS_IOS)
image->SetSourceColorSpace(base::mac::GetSystemColorSpace());
#endif // defined(OS_MACOSX) && !defined(OS_IOS)
}
gfx::Image SelectFaviconFramesFromPNGs(
const std::vector<favicon_base::FaviconRawBitmapResult>& png_data,
const std::vector<float>& favicon_scales,
int favicon_size) {
// Create image reps for as many scales as possible without resizing
// the bitmap data or decoding it. FaviconHandler stores already resized
// favicons into history so no additional resizing should be needed in the
// common case.
// Creating the gfx::Image from |png_data| without resizing or decoding if
// possible is important because:
// - Sync does a byte-to-byte comparison of gfx::Image::As1xPNGBytes() to
// the data it put into the database in order to determine whether any
// updates should be pushed to sync.
// - The decoding occurs on the UI thread and the decoding can be a
// significant performance hit if a user has many bookmarks.
// TODO(pkotwicz): Move the decoding off the UI thread.
std::vector<gfx::ImagePNGRep> png_reps =
SelectFaviconFramesFromPNGsWithoutResizing(
png_data, favicon_scales, favicon_size);
// SelectFaviconFramesFromPNGsWithoutResizing() should have selected the
// largest favicon if |favicon_size| == 0.
if (favicon_size == 0)
return gfx::Image(png_reps);
std::vector<float> favicon_scales_to_generate = favicon_scales;
for (size_t i = 0; i < png_reps.size(); ++i) {
std::vector<float>::iterator iter = std::find(
favicon_scales_to_generate.begin(),
favicon_scales_to_generate.end(),
png_reps[i].scale);
if (iter != favicon_scales_to_generate.end())
favicon_scales_to_generate.erase(iter);
}
if (favicon_scales_to_generate.empty())
return gfx::Image(png_reps);
std::vector<SkBitmap> bitmaps;
for (size_t i = 0; i < png_data.size(); ++i) {
if (!png_data[i].is_valid())
continue;
SkBitmap bitmap;
if (gfx::PNGCodec::Decode(png_data[i].bitmap_data->front(),
png_data[i].bitmap_data->size(),
&bitmap)) {
bitmaps.push_back(bitmap);
}
}
if (bitmaps.empty())
return gfx::Image();
gfx::ImageSkia resized_image_skia;
for (size_t i = 0; i < favicon_scales_to_generate.size(); ++i) {
float scale = favicon_scales_to_generate[i];
int desired_size_in_pixel =
static_cast<int>(std::ceil(favicon_size * scale));
SkBitmap bitmap =
ResizeBitmapByDownsamplingIfPossible(bitmaps, desired_size_in_pixel);
resized_image_skia.AddRepresentation(gfx::ImageSkiaRep(bitmap, scale));
}
if (png_reps.empty())
return gfx::Image(resized_image_skia);
std::vector<gfx::ImageSkiaRep> resized_image_skia_reps =
resized_image_skia.image_reps();
for (size_t i = 0; i < resized_image_skia_reps.size(); ++i) {
scoped_refptr<base::RefCountedBytes> png_bytes(new base::RefCountedBytes());
if (gfx::PNGCodec::EncodeBGRASkBitmap(
resized_image_skia_reps[i].sk_bitmap(),
false,
&png_bytes->data())) {
png_reps.push_back(
gfx::ImagePNGRep(png_bytes, resized_image_skia_reps[i].scale()));
}
}
return gfx::Image(png_reps);
}
} // namespace favicon_base
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