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[util] Port hb-view to use font metrics from HarfBuzz instead of cairo

This commit is contained in:
Behdad Esfahbod 2015-12-10 16:55:16 +01:00
parent 31fa389294
commit 808d3fc0ea
2 changed files with 15 additions and 13 deletions
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4
util/helper-cairo.cc
View File

@ -75,7 +75,9 @@ helper_cairo_create_scaled_font (const font_options_t *font_opts)
hb_font_t *font = hb_font_reference (font_opts->get_font ());
cairo_font_face_t *cairo_face;
FT_Face ft_face = hb_ft_font_get_face (font);
/* We cannot use the FT_Face from hb_font_t, as doing so will confuse hb_font_t because
* cairo will reset the face size. As such, create new face... */
FT_Face ft_face = NULL;//hb_ft_font_get_face (font);
if (!ft_face)
{
if (!ft_library)

24
util/view-cairo.cc
View File

@ -39,16 +39,14 @@ view_cairo_t::render (const font_options_t *font_opts)
int x_sign = font_opts->font_size_x < 0 ? -1 : +1;
int y_sign = font_opts->font_size_y < 0 ? -1 : +1;
cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts);
cairo_font_extents_t font_extents;
cairo_scaled_font_extents (scaled_font, &font_extents);
/* Looks like cairo doesn't negate the sign of font extents even if
* y_scale is negative. This is probably a bug, but that's the way
* it is, and we code for it. Assert, just in case this accidentally
* changes in the future (or is different on non-FreeType cairo font
* backends. */
assert (font_extents.height >= 0);
double leading = font_extents.height + view_options.line_space;
hb_font_t *font = font_opts->get_font();
hb_font_extents_t extents;
hb_font_get_extents_for_direction (font, direction, &extents);
double ascent = y_sign * scalbn ((double) extents.ascender, scale_bits);
double descent = y_sign * -scalbn ((double) extents.descender, scale_bits);
double font_height = y_sign * scalbn ((double) extents.ascender - extents.descender + extents.line_gap, scale_bits);
double leading = font_height + view_options.line_space;
/* Calculate surface size. */
double w, h;
@ -64,6 +62,8 @@ view_cairo_t::render (const font_options_t *font_opts)
w = MAX (w, x_sign * x_advance);
}
cairo_scaled_font_t *scaled_font = helper_cairo_create_scaled_font (font_opts);
/* See if font needs color. */
cairo_content_t content = CAIRO_CONTENT_ALPHA;
if (helper_cairo_scaled_font_has_color (scaled_font))
@ -80,13 +80,13 @@ view_cairo_t::render (const font_options_t *font_opts)
if (vertical)
cairo_translate (cr,
w /* We stack lines right to left */
-font_extents.height * .5 /* "ascent" for vertical */,
-font_height * .5 /* "ascent" for vertical */,
y_sign < 0 ? h : 0);
else
{
cairo_translate (cr,
x_sign < 0 ? w : 0,
y_sign < 0 ? font_extents.descent : font_extents.ascent);
y_sign < 0 ? descent : ascent);
}
/* Draw. */