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lavfi/drawbox: implement color=invert mode

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Based on a libmpcodecs/vf_rectangle.c feature.
This commit is contained in:
Stefano Sabatini 2012-10-30 20:14:07 +01:00
parent 652fab5996
commit 1b3fdd9731
3 changed files with 15 additions and 3 deletions
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4
doc/filters.texi
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@ -1741,7 +1741,9 @@ the input width and height. Default to 0.
@item color, c
Specify the color of the box to write, it can be the name of a color
(case insensitive match) or a 0xRRGGBB[AA] sequence.
(case insensitive match) or a 0xRRGGBB[AA] sequence. If the special
value @code{invert} is used, the box edge color is the same as the
video with inverted luma.
@end table
If the key of the first options is omitted, the arguments are

2
libavfilter/version.h
View File

@ -30,7 +30,7 @@
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 21
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_MICRO 102
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

12
libavfilter/vf_drawbox.c
View File

@ -41,6 +41,7 @@ typedef struct {
int x, y, w, h;
char *color_str;
unsigned char yuv_color[4];
int invert_color; ///< invert luma color
int vsub, hsub; ///< chroma subsampling
} DrawBoxContext;
@ -72,7 +73,9 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
if ((ret = av_opt_set_from_string(drawbox, args, shorthand, "=", ":")) < 0)
return ret;
if (av_parse_color(rgba_color, drawbox->color_str, -1, ctx) < 0)
if (!strcmp(drawbox->color_str, "invert"))
drawbox->invert_color = 1;
else if (av_parse_color(rgba_color, drawbox->color_str, -1, ctx) < 0)
return AVERROR(EINVAL);
drawbox->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
@ -135,6 +138,12 @@ static int draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
row[plane] = picref->data[plane] +
picref->linesize[plane] * (y >> drawbox->vsub);
if (drawbox->invert_color) {
for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++)
if ((y - yb < 3) || (yb + drawbox->h - y < 4) ||
(x - xb < 3) || (xb + drawbox->w - x < 4))
row[0][x] = 0xff - row[0][x];
} else {
for (x = FFMAX(xb, 0); x < (xb + drawbox->w) && x < picref->video->w; x++) {
double alpha = (double)drawbox->yuv_color[A] / 255;
@ -145,6 +154,7 @@ static int draw_slice(AVFilterLink *inlink, int y0, int h, int slice_dir)
row[2][x >> drawbox->hsub] = (1 - alpha) * row[2][x >> drawbox->hsub] + alpha * drawbox->yuv_color[V];
}
}
}
}
return ff_draw_slice(inlink->dst->outputs[0], y0, h, 1);