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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.
- #ifndef COMPONENTS_FAVICON_BASE_SELECT_FAVICON_FRAMES_H_
- #define COMPONENTS_FAVICON_BASE_SELECT_FAVICON_FRAMES_H_
- #include <stddef.h>
- #include <vector>
- class SkBitmap;
- namespace gfx {
- class ImageSkia;
- class Size;
- }
- // Score which is smaller than the minimum score returned by
- // SelectFaviconFrames() or SelectFaviconFrameIndices().
- extern const float kSelectFaviconFramesInvalidScore;
- // Takes a list of all bitmaps found in a .ico file, and creates an
- // ImageSkia that's |desired_size_in_dip| x |desired_size_in_dip| big.
- // Bitmaps are selected by using |SelectFaviconFrameIndices| and the
- // platform's supported favicon scales (favicon_base::GetFaviconScales()).
- // If |desired_size_in_dip| is 0, the largest bitmap is returned unmodified.
- // |original_sizes| are the original sizes of the bitmaps. (For instance,
- // WebContents::DownloadImage() does resampling if it is passed a max size.)
- // If score is non-NULL, it receives a score between 0 (bad) and 1 (good)
- // that describes how well |bitmaps| were able to produce an image at
- // |desired_size_in_dip| for |favicon_scales|.
- // The score is arbitrary, but it's best for exact size matches,
- // and gets worse the more resampling needs to happen.
- // If the resampling algorithm is modified, the resampling done in
- // FaviconUtil::SelectFaviconFramesFromPNGs() should probably be modified too as
- // it inspired by this method.
- // If an unsupported scale (not in the favicon_base::GetFaviconScales())
- // is requested, the ImageSkia will automatically scales using lancoz3.
- // |original_sizes| represents the pixel sizes of the favicon bitmaps in
- // |bitmaps|, which also means both vectors must have the same size.
- gfx::ImageSkia CreateFaviconImageSkia(
- const std::vector<SkBitmap>& bitmaps,
- const std::vector<gfx::Size>& original_sizes,
- int desired_size_in_dip,
- float* score);
- // Takes a list of the pixel sizes of a favicon's favicon bitmaps and returns
- // the indices of the best sizes to use to create an ImageSkia with
- // ImageSkiaReps with edge sizes |desired_sizes|. If '0' is one of
- // |desired_sizes|, the index of the largest size is returned. If |score| is
- // non-NULL, |score| is set to a value between 0 (bad) and 1 (good) that
- // describes how well the bitmap data with the sizes at |best_indices| will
- // produce the ImageSkia. The score is arbitrary, but it's best for exact
- // matches, and gets worse the more resampling needs to happen.
- // TODO(pkotwicz): Change API so that |desired_sizes| being empty indicates
- // that the index of the largest size is requested.
- // TODO(pkotwicz): Remove callers of this method for which |frame_pixel_sizes|
- // are the sizes of the favicon bitmaps after they were resized.
- void SelectFaviconFrameIndices(const std::vector<gfx::Size>& frame_pixel_sizes,
- const std::vector<int>& desired_sizes,
- std::vector<size_t>* best_indices,
- float* score);
- #endif // COMPONENTS_FAVICON_BASE_SELECT_FAVICON_FRAMES_H_
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