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/*
* 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);
#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 */
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