[FFmpeg-cvslog] avfilter/vf_drawtext: fix text width measurement

[yethie]

ffmpeg | branch: master | yethie <klimklim at tiscali.it> | Thu Sep  7 18:39:25 2023 +0200| [aeff5bcba092583cb85b823bb5dbc14099591408] | committer: Paul B Mahol

avfilter/vf_drawtext: fix text width measurement

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=aeff5bcba092583cb85b823bb5dbc14099591408
---

 libavfilter/vf_drawtext.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
index ec8d215795..c5477cbff1 100644
--- a/libavfilter/vf_drawtext.c
+++ b/libavfilter/vf_drawtext.c
@@ -1757,9 +1757,17 @@ continue_on_failed2:
                     first_min_x64 = FFMIN(glyph->bbox.xMin, first_min_x64);
                 }
                 if (t == hb->glyph_count - 1) {
-                    w64 += glyph->bbox.xMax;
-                    last_max_x64 = FFMAX(glyph->bbox.xMax, last_max_x64);
-                    cur_line->offset_right64 = glyph->bbox.xMax;
+                    // The following code measures the width of the line up to the last
+                    // character's horizontal advance
+                    int last_char_width = hb->glyph_pos[t].x_advance;
+
+                    // The following code measures the width of the line up to the rightmost
+                    // visible pixel of the last character
+                    // int last_char_width = glyph->bbox.xMax;
+
+                    w64 += last_char_width;
+                    last_max_x64 = FFMAX(last_char_width, last_max_x64);
+                    cur_line->offset_right64 = last_char_width;
                 } else {
                     if (is_tab) {
                         int size = s->blank_advance64 * s->tabsize;