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 */
49void 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 */
58int av_image_get_linesize(enum PixelFormat 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 */
67int av_image_fill_linesizes(int linesizes[4], enum PixelFormat 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 */
80int av_image_fill_pointers(uint8_t *data[4], enum PixelFormat 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 */
93int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
94                   int w, int h, enum PixelFormat 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 */
105void 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 */
115void 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 PixelFormat 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 */
129int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx);
130
131int ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt);
132
133/**
134 * @}
135 */
136
137
138#endif /* AVUTIL_IMGUTILS_H */
139