/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVFILTER_DRAWUTILS_H#define AVFILTER_DRAWUTILS_H /** * @file * misc drawing utilities */ #include <stdint.h>#include "avfilter.h"#include "libavutil/pixfmt.h" int ff_fill_rgba_map(uint8_t *rgba_map, enum AVPixelFormat pix_fmt); int ff_fill_line_with_color(uint8_t *line[4], int pixel_step[4], int w,                            uint8_t dst_color[4],                            enum AVPixelFormat pix_fmt, uint8_t rgba_color[4],                            int *is_packed_rgba, uint8_t rgba_map[4]); void ff_draw_rectangle(uint8_t *dst[4], int dst_linesize[4],                       uint8_t *src[4], int pixelstep[4],                       int hsub, int vsub, int x, int y, int w, int h); void ff_copy_rectangle(uint8_t *dst[4], int dst_linesize[4],                       uint8_t *src[4], int src_linesize[4], int pixelstep[4],                       int hsub, int vsub, int x, int y, int y2, int w, int h); #define MAX_PLANES 4 typedef struct FFDrawContext {    const struct AVPixFmtDescriptor *desc;    enum AVPixelFormat format;    unsigned nb_planes;    int pixelstep[MAX_PLANES]; /*< offset between pixels */    uint8_t comp_mask[MAX_PLANES]; /*< bitmask of used non-alpha components */    uint8_t hsub[MAX_PLANES];  /*< horizontal subsampling */    uint8_t vsub[MAX_PLANES];  /*< vertical subsampling */    uint8_t hsub_max;    uint8_t vsub_max;    int full_range;    unsigned flags;} FFDrawContext; typedef struct FFDrawColor {    uint8_t rgba[4];    union {        uint32_t u32[4];        uint16_t u16[8];        uint8_t  u8[16];    } comp[MAX_PLANES];} FFDrawColor; /**  * Process alpha pixel component.  */#define FF_DRAW_PROCESS_ALPHA 1 /** * Init a draw context. * * Only a limited number of pixel formats are supported, if format is not * supported the function will return an error. * flags is combination of FF_DRAW_* flags. * @return  0 for success, < 0 for error */int ff_draw_init(FFDrawContext *draw, enum AVPixelFormat format, unsigned flags); /** * Prepare a color. */void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, const uint8_t rgba[4]); /** * Copy a rectangle from an image to another. * * The coordinates must be as even as the subsampling requires. */void ff_copy_rectangle2(FFDrawContext *draw,                        uint8_t *dst[], int dst_linesize[],                        uint8_t *src[], int src_linesize[],                        int dst_x, int dst_y, int src_x, int src_y,                        int w, int h); /** * Fill a rectangle with an uniform color. * * The coordinates must be as even as the subsampling requires. * The color needs to be inited with ff_draw_color. */void ff_fill_rectangle(FFDrawContext *draw, FFDrawColor *color,                       uint8_t *dst[], int dst_linesize[],                       int dst_x, int dst_y, int w, int h); /** * Blend a rectangle with an uniform color. */void ff_blend_rectangle(FFDrawContext *draw, FFDrawColor *color,                        uint8_t *dst[], int dst_linesize[],                        int dst_w, int dst_h,                        int x0, int y0, int w, int h); /** * Blend an alpha mask with an uniform color. * * @param draw           draw context * @param color          color for the overlay; * @param dst            destination image * @param dst_linesize   line stride of the destination * @param dst_w          width of the destination image * @param dst_h          height of the destination image * @param mask           mask * @param mask_linesize  line stride of the mask * @param mask_w         width of the mask * @param mask_h         height of the mask * @param l2depth        log2 of depth of the mask (0 for 1bpp, 3 for 8bpp) * @param endianness     bit order of the mask (0: MSB to the left) * @param x0             horizontal position of the overlay * @param y0             vertical position of the overlay */void ff_blend_mask(FFDrawContext *draw, FFDrawColor *color,                   uint8_t *dst[], int dst_linesize[], int dst_w, int dst_h,                   const uint8_t *mask, int mask_linesize, int mask_w, int mask_h,                   int l2depth, unsigned endianness, int x0, int y0); /** * Round a dimension according to subsampling. * * @param draw       draw context * @param sub_dir    0 for horizontal, 1 for vertical * @param round_dir  0 nearest, -1 round down, +1 round up * @param value      value to round * @return  the rounded value */int ff_draw_round_to_sub(FFDrawContext *draw, int sub_dir, int round_dir,                         int value); /** * Return the list of pixel formats supported by the draw functions. * * The flags are the same as ff_draw_init, i.e., none currently. */AVFilterFormats *ff_draw_supported_pixel_formats(unsigned flags); #endif /* AVFILTER_DRAWUTILS_H */