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[ft] Towards caching slow get_h_advance results 

Related to https://github.com/harfbuzz/harfbuzz/pull/1082
This commit is contained in:
Behdad Esfahbod 2018-09-11 14:05:16 +02:00
parent 237f215378
commit 047a84c5dd
1 changed files with 20 additions and 4 deletions
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24
src/hb-ft.cc
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@ -239,14 +239,30 @@ hb_ft_get_glyph_h_advances (hb_font_t* font, void* font_data,
{
const hb_ft_font_t *ft_font = (const hb_ft_font_t *) font_data;
FT_Face ft_face = ft_font->ft_face;
int load_flags = ft_font->load_flags;
int load_flags;
int mult = font->x_scale < 0 ? -1 : +1;
FT_Fixed v;
for (unsigned int i = 0; i < count; i++)
unsigned int i = 0;
load_flags = ft_font->load_flags | FT_ADVANCE_FLAG_FAST_ONLY;
for (; i < count; i++)
{
v = 0;
FT_Fixed v = 0;
if (unlikely (FT_Get_Advance (ft_face, *first_glyph, load_flags, &v)))
goto slow;
*first_advance = (v * mult + (1<<9)) >> 10;
first_glyph = &StructAtOffset<hb_codepoint_t> (first_glyph, glyph_stride);
first_advance = &StructAtOffset<hb_position_t> (first_advance, advance_stride);
}
return;
slow:
/* TODO Prepare and use cache. */
load_flags = ft_font->load_flags;// & ~FT_ADVANCE_FLAG_FAST_ONLY;
for (; i < count; i++)
{
FT_Fixed v = 0;
FT_Get_Advance (ft_face, *first_glyph, load_flags, &v);
*first_advance = (v * mult + (1<<9)) >> 10;
first_glyph = &StructAtOffset<hb_codepoint_t> (first_glyph, glyph_stride);