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The use of filters prior to PNG compression can greatly improve compression ratio, with "mixed" (ImageMagick calls it "adaptive") typically achieving the best results.
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*
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* This file is part of mplayer.
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*
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* mplayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mplayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mplayer. If not, see <http://www.gnu.org/licenses/>.
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*/
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struct mp_image;
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struct mp_csp_details;
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struct image_writer_opts {
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char *format;
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int png_compression;
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int png_filter;
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int jpeg_quality;
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int jpeg_optimize;
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int jpeg_smooth;
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int jpeg_dpi;
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int jpeg_progressive;
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int jpeg_baseline;
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};
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extern const struct image_writer_opts image_writer_opts_defaults;
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extern const struct m_sub_options image_writer_conf;
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// Return the file extension that will be used, e.g. "png".
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const char *image_writer_file_ext(const struct image_writer_opts *opts);
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/*
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* Save the given image under the given filename. The parameters csp and opts
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* are optional. All pixel formats supported by swscale are supported.
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*
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* File format and compression settings are controlled via the opts parameter.
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*
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* NOTE: The fields w/h/width/height of the passed mp_image must be all set
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* accordingly. Setting w and width or h and height to different values
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* can be used to store snapshots of anamorphic video.
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*/
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int write_image(struct mp_image *image, const struct image_writer_opts *opts,
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const char *filename);
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// Debugging helper.
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void dump_png(struct mp_image *image, const char *filename);
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