/*
  * 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;

     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 */