From: Michael Niedermayer <michae...@gmx.at>
Signed-off-by: Michael Niedermayer <michae...@gmx.at>
Signed-off-by: Anton Khirnov <an...@khirnov.net>
---
libavfilter/vf_drawtext.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index fa6b7fd..7b503f5 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -385,12 +385,14 @@ static int config_input(AVFilterLink *inlink)
#define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
- chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
- chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
alpha = yuva_color[3] * (val) * 129; \
picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 -
alpha) * picref->data[0][luma_pos] ) >> 23; \
- picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 -
alpha) * picref->data[1][chroma_pos1]) >> 23; \
- picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 -
alpha) * picref->data[2][chroma_pos2]) >> 23; \
+ if(((x) & ((1<<(hsub))-1))==0 && ((y) & ((1<<(vsub))-1))==0){\
+ chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1];
\
+ chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2];
\
+ picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 -
alpha) * picref->data[1][chroma_pos1]) >> 23; \
+ picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 -
alpha) * picref->data[2][chroma_pos2]) >> 23; \
+ }\
}
static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
unsigned int x,
--
1.7.4.1
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