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1 | /* |
2 | * This file is part of FFmpeg. | |
3 | * | |
4 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #ifndef AVFILTER_DRAWUTILS_H | |
20 | #define AVFILTER_DRAWUTILS_H | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * misc drawing utilities | |
25 | */ | |
26 | ||
27 | #include <stdint.h> | |
28 | #include "avfilter.h" | |
29 | #include "libavutil/pixfmt.h" | |
30 | ||
31 | int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt); | |
32 | ||
33 | int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w, | |
34 | uint8_t dst_color[4], | |
35 | enum AVPixelFormat pix_fmt, uint8_t rgba_color[4], | |
36 | int *is_packed_rgba, uint8_t rgba_map[4]); | |
37 | ||
38 | void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4], | |
39 | uint8_t *src[4], int pixelstep[4], | |
40 | int hsub, int vsub, int x, int y, int w, int h); | |
41 | ||
42 | void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4], | |
43 | uint8_t *src[4], int src_linesize[4], int pixelstep[4], | |
44 | int hsub, int vsub, int x, int y, int y2, int w, int h); | |
45 | ||
46 | #define MAX_PLANES 4 | |
47 | ||
48 | typedef struct FFDrawContext { | |
49 | const struct AVPixFmtDescriptor *desc; | |
50 | enum AVPixelFormat format; | |
51 | unsigned nb_planes; | |
52 | int pixelstep[MAX_PLANES]; /*< offset between pixels */ | |
53 | uint8_t comp_mask[MAX_PLANES]; /*< bitmask of used non-alpha components */ | |
54 | uint8_t hsub[MAX_PLANES]; /*< horizontal subsampling */ | |
55 | uint8_t vsub[MAX_PLANES]; /*< vertical subsampling */ | |
56 | uint8_t hsub_max; | |
57 | uint8_t vsub_max; | |
58 | } FFDrawContext; | |
59 | ||
60 | typedef struct FFDrawColor { | |
61 | uint8_t rgba[4]; | |
62 | union { | |
63 | uint32_t u32; | |
64 | uint16_t u16; | |
65 | uint8_t u8[4]; | |
66 | } comp[MAX_PLANES]; | |
67 | } FFDrawColor; | |
68 | ||
69 | /** | |
70 | * Init a draw context. | |
71 | * | |
72 | * Only a limited number of pixel formats are supported, if format is not | |
73 | * supported the function will return an error. | |
74 | * No flags currently defined. | |
75 | * @return 0 for success, < 0 for error | |
76 | */ | |
77 | int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags); | |
78 | ||
79 | /** | |
80 | * Prepare a color. | |
81 | */ | |
82 | void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4]); | |
83 | ||
84 | /** | |
85 | * Copy a rectangle from an image to another. | |
86 | * | |
87 | * The coordinates must be as even as the subsampling requires. | |
88 | */ | |
89 | void ff_copy_rectangle2(FFDrawContext *draw, | |
90 | uint8_t *dst[], int dst_linesize[], | |
91 | uint8_t *src[], int src_linesize[], | |
92 | int dst_x, int dst_y, int src_x, int src_y, | |
93 | int w, int h); | |
94 | ||
95 | /** | |
96 | * Fill a rectangle with an uniform color. | |
97 | * | |
98 | * The coordinates must be as even as the subsampling requires. | |
99 | * The color needs to be inited with ff_draw_color. | |
100 | */ | |
101 | void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color, | |
102 | uint8_t *dst[], int dst_linesize[], | |
103 | int dst_x, int dst_y, int w, int h); | |
104 | ||
105 | /** | |
106 | * Blend a rectangle with an uniform color. | |
107 | */ | |
108 | void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color, | |
109 | uint8_t *dst[], int dst_linesize[], | |
110 | int dst_w, int dst_h, | |
111 | int x0, int y0, int w, int h); | |
112 | ||
113 | /** | |
114 | * Blend an alpha mask with an uniform color. | |
115 | * | |
116 | * @param draw draw context | |
117 | * @param color color for the overlay; | |
118 | * @param dst destination image | |
119 | * @param dst_linesize line stride of the destination | |
120 | * @param dst_w width of the destination image | |
121 | * @param dst_h height of the destination image | |
122 | * @param mask mask | |
123 | * @param mask_linesize line stride of the mask | |
124 | * @param mask_w width of the mask | |
125 | * @param mask_h height of the mask | |
126 | * @param l2depth log2 of depth of the mask (0 for 1bpp, 3 for 8bpp) | |
127 | * @param endianness bit order of the mask (0: MSB to the left) | |
128 | * @param x0 horizontal position of the overlay | |
129 | * @param y0 vertical position of the overlay | |
130 | */ | |
131 | void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color, | |
132 | uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h, | |
133 | uint8_t *mask, int mask_linesize, int mask_w, int mask_h, | |
134 | int l2depth, unsigned endianness, int x0, int y0); | |
135 | ||
136 | /** | |
137 | * Round a dimension according to subsampling. | |
138 | * | |
139 | * @param draw draw context | |
140 | * @param sub_dir 0 for horizontal, 1 for vertical | |
141 | * @param round_dir 0 nearest, -1 round down, +1 round up | |
142 | * @param value value to round | |
143 | * @return the rounded value | |
144 | */ | |
145 | int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir, | |
146 | int value); | |
147 | ||
148 | /** | |
149 | * Return the list of pixel formats supported by the draw functions. | |
150 | * | |
151 | * The flags are the same as ff_draw_init, i.e., none currently. | |
152 | */ | |
153 | AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags); | |
154 | ||
155 | #endif /* AVFILTER_DRAWUTILS_H */ |