It is applied to every glyph. There is no space between all words in some
languages, for example Chinese, Japanese and so on. So a sentence will look
very compactly. I think if we could set glyph spacing, it will adapt to more
different scenarios. Maybe it is simple but useful.
ffmpeg -i input -vf
drawtext="glyph_spacing=10:text="PROGRAMMING":fontfile=demo.ttf" -f flv 1.flv
could set glyph spacing 10 pixel.
Signed-off-by: efren yang <efren_y...@163.com>
---
doc/filters.texi | 4 ++++
libavfilter/vf_drawtext.c | 3 +++
2 files changed, 7 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index 119d1be69d..0f336f8826 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -7077,6 +7077,10 @@ The default value of @var{boxcolor} is "white".
Set the line spacing in pixels of the border to be drawn around the box using
@var{box}.
The default value of @var{line_spacing} is 0.
+@item glyph_spacing
+Set the glyph spacing in pixels for drawing text.
+The default value of @var{glyph_spacing} is 0.
+
@item borderw
Set the width of the border to be drawn around the text using
@var{bordercolor}.
The default value of @var{borderw} is 0.
diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index f6151443bb..152d8f35d5 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -162,6 +162,7 @@ typedef struct DrawTextContext {
unsigned int default_fontsize; ///< default font size to use
int line_spacing; ///< lines spacing in pixels
+ int glyph_spacing; ///< glyph spacing in pixels
short int draw_box; ///< draw box around text - true or false
int boxborderw; ///< box border width
int use_kerning; ///< font kerning is used - true/false
@@ -214,6 +215,7 @@ static const AVOption drawtext_options[]= {
{"box", "set box", OFFSET(draw_box),
AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 , FLAGS},
{"boxborderw", "set box border width", OFFSET(boxborderw),
AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
{"line_spacing", "set line spacing in pixels", OFFSET(line_spacing),
AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX,FLAGS},
+ {"glyph_spacing", "set glyph spacing in pixels", OFFSET(glyph_spacing),
AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX,FLAGS },
{"fontsize", "set font size", OFFSET(fontsize_expr),
AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX , FLAGS},
{"x", "set x expression", OFFSET(x_expr),
AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
{"y", "set y expression", OFFSET(y_expr),
AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
@@ -1374,6 +1376,7 @@ static int draw_text(AVFilterContext *ctx, AVFrame *frame,
s->positions[i].y = y - glyph->bitmap_top + y_max;
if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize;
else x += glyph->advance;
+ x += s->glyph_spacing;
}
max_text_line_w = FFMAX(x, max_text_line_w);
--
2.13.0.windows.1
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