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imgutils.h (4966B)

      1 /*
      2 * This file is part of Libav.
      3 *
      4 * Libav is free software; you can redistribute it and/or
      5 * modify it under the terms of the GNU Lesser General Public
      6 * License as published by the Free Software Foundation; either
      7 * version 2.1 of the License, or (at your option) any later version.
      8 *
      9 * Libav is distributed in the hope that it will be useful,
     10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12 * Lesser General Public License for more details.
     13 *
     14 * You should have received a copy of the GNU Lesser General Public
     15 * License along with Libav; if not, write to the Free Software
     16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     17 */
     18 
     19 #ifndef AVUTIL_IMGUTILS_H
     20 #define AVUTIL_IMGUTILS_H
     21 
     22 /**
     23 * @file
     24 * misc image utilities
     25 *
     26 * @addtogroup lavu_picture
     27 * @{
     28 */
     29 
     30 #include "avutil.h"
     31 #include "pixdesc.h"
     32 
     33 /**
     34 * Compute the max pixel step for each plane of an image with a
     35 * format described by pixdesc.
     36 *
     37 * The pixel step is the distance in bytes between the first byte of
     38 * the group of bytes which describe a pixel component and the first
     39 * byte of the successive group in the same plane for the same
     40 * component.
     41 *
     42 * @param max_pixsteps an array which is filled with the max pixel step
     43 * for each plane. Since a plane may contain different pixel
     44 * components, the computed max_pixsteps[plane] is relative to the
     45 * component in the plane with the max pixel step.
     46 * @param max_pixstep_comps an array which is filled with the component
     47 * for each plane which has the max pixel step. May be NULL.
     48 */
     49 void av_image_fill_max_pixsteps(int max_pixsteps[4], int max_pixstep_comps[4],
     50                                const AVPixFmtDescriptor *pixdesc);
     51 
     52 /**
     53 * Compute the size of an image line with format pix_fmt and width
     54 * width for the plane plane.
     55 *
     56 * @return the computed size in bytes
     57 */
     58 int av_image_get_linesize(enum AVPixelFormat pix_fmt, int width, int plane);
     59 
     60 /**
     61 * Fill plane linesizes for an image with pixel format pix_fmt and
     62 * width width.
     63 *
     64 * @param linesizes array to be filled with the linesize for each plane
     65 * @return >= 0 in case of success, a negative error code otherwise
     66 */
     67 int av_image_fill_linesizes(int linesizes[4], enum AVPixelFormat pix_fmt, int width);
     68 
     69 /**
     70 * Fill plane data pointers for an image with pixel format pix_fmt and
     71 * height height.
     72 *
     73 * @param data pointers array to be filled with the pointer for each image plane
     74 * @param ptr the pointer to a buffer which will contain the image
     75 * @param linesizes the array containing the linesize for each
     76 * plane, should be filled by av_image_fill_linesizes()
     77 * @return the size in bytes required for the image buffer, a negative
     78 * error code in case of failure
     79 */
     80 int av_image_fill_pointers(uint8_t *data[4], enum AVPixelFormat pix_fmt, int height,
     81                           uint8_t *ptr, const int linesizes[4]);
     82 
     83 /**
     84 * Allocate an image with size w and h and pixel format pix_fmt, and
     85 * fill pointers and linesizes accordingly.
     86 * The allocated image buffer has to be freed by using
     87 * av_freep(&pointers[0]).
     88 *
     89 * @param align the value to use for buffer size alignment
     90 * @return the size in bytes required for the image buffer, a negative
     91 * error code in case of failure
     92 */
     93 int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
     94                   int w, int h, enum AVPixelFormat pix_fmt, int align);
     95 
     96 /**
     97 * Copy image plane from src to dst.
     98 * That is, copy "height" number of lines of "bytewidth" bytes each.
     99 * The first byte of each successive line is separated by *_linesize
    100 * bytes.
    101 *
    102 * @param dst_linesize linesize for the image plane in dst
    103 * @param src_linesize linesize for the image plane in src
    104 */
    105 void av_image_copy_plane(uint8_t       *dst, int dst_linesize,
    106                         const uint8_t *src, int src_linesize,
    107                         int bytewidth, int height);
    108 
    109 /**
    110 * Copy image in src_data to dst_data.
    111 *
    112 * @param dst_linesizes linesizes for the image in dst_data
    113 * @param src_linesizes linesizes for the image in src_data
    114 */
    115 void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4],
    116                   const uint8_t *src_data[4], const int src_linesizes[4],
    117                   enum AVPixelFormat pix_fmt, int width, int height);
    118 
    119 /**
    120 * Check if the given dimension of an image is valid, meaning that all
    121 * bytes of the image can be addressed with a signed int.
    122 *
    123 * @param w the width of the picture
    124 * @param h the height of the picture
    125 * @param log_offset the offset to sum to the log level for logging with log_ctx
    126 * @param log_ctx the parent logging context, it may be NULL
    127 * @return >= 0 if valid, a negative error code otherwise
    128 */
    129 int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx);
    130 
    131 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
    132 
    133 /**
    134 * @}
    135 */
    136 
    137 
    138 #endif /* AVUTIL_IMGUTILS_H */