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drawing cute arrows instead of lame lines for motion vector visualization

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Originally committed as revision 1512 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-01-26 23:11:08 +00:00
parent 2ba8f6b817
commit 49c79e6c5a
1 changed files with 21 additions and 2 deletions
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23
libavcodec/h263dec.c
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@ -377,6 +377,25 @@ static void draw_line(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h
}
}
static void draw_arrow(uint8_t *buf, int sx, int sy, int ex, int ey, int w, int h, int stride, int color){
int dx= ex - sx;
int dy= ey - sy;
if(dx*dx + dy*dy > 3*3){
int rx= dx + dy;
int ry= -dx + dy;
int length= ff_sqrt((rx*rx + ry*ry)<<8);
//FIXME subpixel accuracy
rx= ROUNDED_DIV(rx*3<<4, length);
ry= ROUNDED_DIV(ry*3<<4, length);
draw_line(buf, sx, sy, sx + rx, sy + ry, w, h, stride, color);
draw_line(buf, sx, sy, sx - ry, sy + rx, w, h, stride, color);
}
draw_line(buf, sx, sy, ex, ey, w, h, stride, color);
}
int ff_h263_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
UINT8 *buf, int buf_size)
@ -703,7 +722,7 @@ retry:
int xy= 1 + mb_x*2 + (i&1) + (mb_y*2 + 1 + (i>>1))*(s->mb_width*2 + 2);
int mx= (s->motion_val[xy][0]>>shift) + sx;
int my= (s->motion_val[xy][1]>>shift) + sy;
draw_line(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
}
}else{
int sx= mb_x*16 + 8;
@ -711,7 +730,7 @@ retry:
int xy= 1 + mb_x*2 + (mb_y*2 + 1)*(s->mb_width*2 + 2);
int mx= (s->motion_val[xy][0]>>shift) + sx;
int my= (s->motion_val[xy][1]>>shift) + sy;
draw_line(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
draw_arrow(ptr, sx, sy, mx, my, s->width, s->height, s->linesize, 100);
}
s->mbskip_table[mb_index]=0;
}