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Diffstat (limited to 'ffmpeg1/libavfilter/drawutils.h')
| -rw-r--r-- | ffmpeg1/libavfilter/drawutils.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/ffmpeg1/libavfilter/drawutils.h b/ffmpeg1/libavfilter/drawutils.h new file mode 100644 index 0000000..5ffffe7 --- /dev/null +++ b/ffmpeg1/libavfilter/drawutils.h @@ -0,0 +1,155 @@ +/* + * 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; +} FFDrawContext; + +typedef struct FFDrawColor { + uint8_t rgba[4]; + union { + uint32_t u32; + uint16_t u16; + uint8_t u8[4]; + } comp[MAX_PLANES]; +} FFDrawColor; + +/** + * Init a draw context. + * + * Only a limited number of pixel formats are supported, if format is not + * supported the function will return an error. + * No flags currently defined. + * @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, + 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 */ |