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// Copyright 2013 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/utility/importer/favicon_reencode.h"
#include "content/public/child/image_decoder_utils.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/favicon_size.h"
#include "ui/gfx/geometry/size.h"
namespace importer {
std::optional<std::vector<uint8_t>> ReencodeFavicon(
base::span<const uint8_t> src) {
// Decode the favicon using WebKit's image decoder.
SkBitmap decoded = content::DecodeImage(
src, gfx::Size(gfx::kFaviconSize, gfx::kFaviconSize));
if (decoded.empty()) {
return std::nullopt; // Unable to decode.
}
if (decoded.width() != gfx::kFaviconSize ||
decoded.height() != gfx::kFaviconSize) {
// The bitmap is not the correct size, re-sample.
int new_width = decoded.width();
int new_height = decoded.height();
gfx::CalculateFaviconTargetSize(&new_width, &new_height);
decoded = skia::ImageOperations::Resize(
decoded, skia::ImageOperations::RESIZE_LANCZOS3, new_width, new_height);
}
// Encode our bitmap as a PNG.
return gfx::PNGCodec::EncodeBGRASkBitmap(decoded,
/*discard_transparency=*/false);
}
} // namespace importer
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