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authorGrigori Goronzy <greg@hein>2009-07-07 20:25:55 +0200
committerGrigori Goronzy <greg@blackbox>2009-07-07 23:07:50 +0200
commitf54a0cf94853d8372225bb0b45d6bd2b8e4e6fde (patch)
tree9c0e3b14e8ecf6e8cc1fe3f2107aad94d134cdd4 /libass/ass_render.c
parent5a2b270b218a429763f0a032386705f55bca0a92 (diff)
downloadlibass-f54a0cf94853d8372225bb0b45d6bd2b8e4e6fde.tar.bz2
libass-f54a0cf94853d8372225bb0b45d6bd2b8e4e6fde.tar.xz
Support for underline and strikethrough
Add support for the underline (\u) and strikethrough/strikeout (\s) properties. This is a bit tricky, since FreeType doesn't offer any method of adding the lines, so you have to draw them yourself. libass uses various information from TrueType tables to get position and size of the lines, does a few simple consistency checks (some fonts might be broken) and if everything is alright, adds new contours for the lines. Sometimes, rendering errors can occur: - Currently, kerning isn't taken into account, which means the lines can overlap a little, leading to small optical glitches. - Some (broken) fonts use the wrong winding direction. In this case, the FreeType stroker will only consider the added lines to be "outside" and only stroke the line instead of the whole glyph.
Diffstat (limited to 'libass/ass_render.c')
-rw-r--r--libass/ass_render.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/libass/ass_render.c b/libass/ass_render.c
index c112399..19870a5 100644
--- a/libass/ass_render.c
+++ b/libass/ass_render.c
@@ -144,6 +144,7 @@ typedef struct render_context_s {
ass_font_t *font;
char *font_path;
double font_size;
+ int flags; // decoration flags (underline/strike-through)
FT_Stroker stroker_x;
FT_Stroker stroker_y;
@@ -1561,6 +1562,18 @@ static char *parse_tag(ass_renderer_t *render_priv, char *p, double pwr)
} else
val = 0.;
render_priv->state.shadow_x = render_priv->state.shadow_y = val;
+ } else if (mystrcmp(&p, "s")) {
+ int val;
+ if (mystrtoi(&p, &val) && val)
+ render_priv->state.flags |= DECO_STRIKETHROUGH;
+ else
+ render_priv->state.flags &= ~DECO_STRIKETHROUGH;
+ } else if (mystrcmp(&p, "u")) {
+ int val;
+ if (mystrtoi(&p, &val) && val)
+ render_priv->state.flags |= DECO_UNDERLINE;
+ else
+ render_priv->state.flags &= ~DECO_UNDERLINE;
} else if (mystrcmp(&p, "pbo")) {
double val = 0;
if (mystrtod(&p, &val))
@@ -1716,6 +1729,9 @@ static void reset_render_context(ass_renderer_t *render_priv)
render_priv->state.c[1] = render_priv->state.style->SecondaryColour;
render_priv->state.c[2] = render_priv->state.style->OutlineColour;
render_priv->state.c[3] = render_priv->state.style->BackColour;
+ render_priv->state.flags =
+ (render_priv->state.style->Underline ? DECO_UNDERLINE : 0) |
+ (render_priv->state.style->StrikeOut ? DECO_STRIKETHROUGH : 0);
render_priv->state.font_size = render_priv->state.style->FontSize;
if (render_priv->state.family)
@@ -1904,6 +1920,7 @@ get_outline_glyph(ass_renderer_t *render_priv, int symbol,
key.advance = *advance;
key.outline.x = render_priv->state.border_x * 0xFFFF;
key.outline.y = render_priv->state.border_y * 0xFFFF;
+ key.flags = render_priv->state.flags;
}
memset(info, 0, sizeof(glyph_info_t));
@@ -1928,7 +1945,8 @@ get_outline_glyph(ass_renderer_t *render_priv, int symbol,
info->glyph =
ass_font_get_glyph(render_priv->fontconfig_priv,
render_priv->state.font, symbol,
- render_priv->settings.hinting);
+ render_priv->settings.hinting,
+ render_priv->state.flags);
}
if (!info->glyph)
return;