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// Copyright 2014 The Chromium Authors
// 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 <algorithm>
#include <cmath>
#include "base/trace_event/trace_event.h"
#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 "third_party/skia/include/core/SkImage.h"
#include "ui/base/resource/resource_scale_factor.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"
#include "ui/gfx/image/image_skia_rep.h"
#if BUILDFLAG(IS_MAC)
#include "base/mac/mac_util.h"
#endif // BUILDFLAG(IS_MAC)
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) {
TRACE_EVENT0("browser",
"FaviconUtil::SelectFaviconFramesFromPNGsWithoutResizing");
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;
auto 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, SkSurfaceProps{});
canvas.drawImageRect(best_bitmap.asImage(),
SkRect::MakeIWH(desired_size, desired_size),
SkSamplingOptions());
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;
// 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 (const auto scale_factor : ui::GetSupportedResourceScaleFactors()) {
if (scale_factor != ui::k100Percent) {
favicon_scales.push_back(
ui::GetScaleForResourceScaleFactor(scale_factor));
}
}
return favicon_scales;
}
gfx::Image SelectFaviconFramesFromPNGs(
const std::vector<favicon_base::FaviconRawBitmapResult>& png_data,
const std::vector<float>& favicon_scales,
int favicon_size) {
TRACE_EVENT0("browser", "FaviconUtil::SelectFaviconFramesFromPNGs");
// 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 (auto& png_rep : png_reps) {
auto iter = std::ranges::find(favicon_scales_to_generate, png_rep.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 (const auto& data : png_data) {
if (!data.is_valid()) {
continue;
}
SkBitmap bitmap = gfx::PNGCodec::Decode(*data.bitmap_data);
if (!bitmap.isNull()) {
bitmaps.push_back(bitmap);
}
}
if (bitmaps.empty()) {
return gfx::Image();
}
gfx::ImageSkia resized_image_skia;
for (float scale : favicon_scales_to_generate) {
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 (const auto& resized_image_skia_rep : resized_image_skia_reps) {
if (std::optional<std::vector<uint8_t>> encoded =
gfx::PNGCodec::EncodeBGRASkBitmap(
resized_image_skia_rep.GetBitmap(),
/*discard_transparency=*/false)) {
auto png_bytes = base::MakeRefCounted<base::RefCountedBytes>(
std::move(encoded.value()));
png_reps.emplace_back(png_bytes, resized_image_skia_rep.scale());
}
}
return gfx::Image(png_reps);
}
favicon_base::FaviconRawBitmapResult ResizeFaviconBitmapResult(
int desired_size_in_pixel,
const std::vector<favicon_base::FaviconRawBitmapResult>&
favicon_bitmap_results) {
TRACE_EVENT0("browser", "FaviconUtil::ResizeFaviconBitmapResult");
if (favicon_bitmap_results.empty() || !favicon_bitmap_results[0].is_valid())
return favicon_base::FaviconRawBitmapResult();
favicon_base::FaviconRawBitmapResult bitmap_result =
favicon_bitmap_results[0];
// If the desired size is 0, SelectFaviconFrames() will return the largest
// bitmap without doing any resizing. As |favicon_bitmap_results| has bitmap
// data for a single bitmap, return it and avoid an unnecessary decode.
if (desired_size_in_pixel == 0)
return bitmap_result;
// If history bitmap is already desired pixel size, return early.
if (bitmap_result.pixel_size.width() == desired_size_in_pixel &&
bitmap_result.pixel_size.height() == desired_size_in_pixel)
return bitmap_result;
// Convert raw bytes to SkBitmap, resize via SelectFaviconFrames(), then
// convert back.
std::vector<float> desired_favicon_scales;
desired_favicon_scales.push_back(1.0f);
gfx::Image resized_image = favicon_base::SelectFaviconFramesFromPNGs(
favicon_bitmap_results, desired_favicon_scales, desired_size_in_pixel);
std::optional<std::vector<uint8_t>> resized_bitmap_data =
gfx::PNGCodec::EncodeBGRASkBitmap(resized_image.AsBitmap(),
/*discard_transparency=*/false);
if (!resized_bitmap_data) {
return favicon_base::FaviconRawBitmapResult();
}
bitmap_result.bitmap_data = base::MakeRefCounted<base::RefCountedBytes>(
std::move(resized_bitmap_data).value());
bitmap_result.pixel_size =
gfx::Size(desired_size_in_pixel, desired_size_in_pixel);
return bitmap_result;
}
} // namespace favicon_base
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