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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SAFE_BROWSING_CONTENT_COMMON_VISUAL_UTILS_H_
#define COMPONENTS_SAFE_BROWSING_CONTENT_COMMON_VISUAL_UTILS_H_
#include <string>
#include "components/safe_browsing/core/common/proto/client_model.pb.h"
#include "components/safe_browsing/core/common/proto/csd.pb.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/geometry/size.h"
namespace safe_browsing::visual_utils {
// Enum used to represent the result of the function |CanExtractVisualFeatures|.
enum class CanExtractVisualFeaturesResult {
kCanExtractVisualFeatures = 0,
kUserNotOptedIn = 1,
kOffTheRecord = 2,
kBelowMinFrame = 3,
kAboveZoomLevel = 4,
kMaxValue = kAboveZoomLevel,
};
// Computes the BlurredImage for the given input image. This involves
// downsampling the image to a certain fixed resolution, then blurring
// by taking an average over fixed-size blocks of pixels.
bool GetBlurredImage(const SkBitmap& image,
VisualFeatures::BlurredImage* blurred_image);
// Downsizes an image by averaging all the pixels in the source image that
// contribute to the target image. Groups pixels into squares of size
// |block_size|, potentially with partial blocks at the edge. The output
// image has pixels the average of the pixels in each block.
std::unique_ptr<SkBitmap> BlockMeanAverage(const SkBitmap& image,
int block_size);
// Whether we can extract visual features from a page with a given size and zoom
// level. For password protection, the safe browsing preference that allows the
// extraction are extended reporting and enhanced safe browsing, whereas for
// client side detection, it's just enhanced safe browsing.
#if BUILDFLAG(IS_ANDROID)
CanExtractVisualFeaturesResult CanExtractVisualFeatures(bool is_user_opted_in,
bool is_off_the_record,
gfx::Size size);
#else
CanExtractVisualFeaturesResult CanExtractVisualFeatures(bool is_user_opted_in,
bool is_off_the_record,
gfx::Size size,
double zoom_level);
#endif
// Extract a VisualFeatures proto from the given `bitmap`.
std::unique_ptr<VisualFeatures> ExtractVisualFeatures(const SkBitmap& bitmap);
} // namespace safe_browsing::visual_utils
#endif // COMPONENTS_SAFE_BROWSING_CONTENT_COMMON_VISUAL_UTILS_H_
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