| 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 */ |