diff options
author | Nicolas George <nicolas.george@normalesup.org> | 2012-02-23 14:07:01 +0400 |
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committer | Nicolas George <nicolas.george@normalesup.org> | 2012-03-21 18:52:45 +0400 |
commit | 8ec0832743d73c5de4c4978ea5f65b54cfa07625 (patch) | |
tree | 6579fe38f1ca0bf247a428895a980d0ee0110dc9 /libavfilter/drawutils.h | |
parent | 87a72b9122e49f209c89fc83af2d51f5cdf44ce2 (diff) |
drawutils: new API.
This new API stores useful data in a dedicated structure
and has clearly delimited init functions.
Hopefully, uses of the old API can be replaced quickly.
Diffstat (limited to 'libavfilter/drawutils.h')
-rw-r--r-- | libavfilter/drawutils.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/libavfilter/drawutils.h b/libavfilter/drawutils.h index 330b1cb0aa..9e98f4e7a1 100644 --- a/libavfilter/drawutils.h +++ b/libavfilter/drawutils.h @@ -25,6 +25,7 @@ */ #include <stdint.h> +#include "avfilter.h" #include "libavutil/pixfmt.h" int ff_fill_rgba_map(uint8_t *rgba_map, enum PixelFormat pix_fmt); @@ -42,4 +43,80 @@ 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 PixelFormat format; + unsigned nb_planes; + int pixelstep[MAX_PLANES]; /*< offset between pixels */ + uint8_t hsub[MAX_PLANES]; /*< horizontal subsamling */ + uint8_t vsub[MAX_PLANES]; /*< vertical subsamling */ + uint8_t hsub_max; + uint8_t vsub_max; +} FFDrawContext; + +typedef struct FFDrawColor { + 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 PixelFormat format, unsigned flags); + +/** + * Prepare a color. + */ +void ff_draw_color(FFDrawContext *draw, FFDrawColor *color, 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); + +/** + * 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 */ |