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Merge pull request #357 from khaledhosny/graphite-scale 

[graphite] Fix shaping with varying font sizes
This commit is contained in:
Behdad Esfahbod 2017-02-08 14:36:18 -08:00 committed by GitHub
parent 7c47474f20 b435c7c46a
commit c8dfed8e1e
2 changed files with 22 additions and 27 deletions
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45
src/hb-graphite2.cc
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@ -27,7 +27,6 @@
*/
#define HB_SHAPER graphite2
#define hb_graphite2_shaper_font_data_t gr_font
#include "hb-shaper-impl-private.hh"
#include "hb-graphite2.h"
@ -153,26 +152,17 @@ hb_graphite2_face_get_gr_face (hb_face_t *face)
* shaper font data
*/
static float hb_graphite2_get_advance (const void *hb_font, unsigned short gid)
{
return ((hb_font_t *) hb_font)->get_glyph_h_advance (gid);
}
struct hb_graphite2_shaper_font_data_t {};
hb_graphite2_shaper_font_data_t *
_hb_graphite2_shaper_font_data_create (hb_font_t *font)
_hb_graphite2_shaper_font_data_create (hb_font_t *font HB_UNUSED)
{
if (unlikely (!hb_graphite2_shaper_face_data_ensure (font->face))) return NULL;
hb_face_t *face = font->face;
hb_graphite2_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
return gr_make_font_with_advance_fn (font->x_scale, font, &hb_graphite2_get_advance, face_data->grface);
return (hb_graphite2_shaper_font_data_t *) HB_SHAPER_DATA_SUCCEEDED;
}
void
_hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data)
_hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data HB_UNUSED)
{
gr_font_destroy (data);
}
/*
@ -181,8 +171,7 @@ _hb_graphite2_shaper_font_data_destroy (hb_graphite2_shaper_font_data_t *data)
gr_font *
hb_graphite2_font_get_gr_font (hb_font_t *font)
{
if (unlikely (!hb_graphite2_shaper_font_data_ensure (font))) return NULL;
return HB_SHAPER_DATA_GET (font);
return NULL;
}
@ -230,7 +219,6 @@ _hb_graphite2_shape (hb_shape_plan_t *shape_plan,
{
hb_face_t *face = font->face;
gr_face *grface = HB_SHAPER_DATA_GET (face)->grface;
gr_font *grfont = HB_SHAPER_DATA_GET (font);
const char *lang = hb_language_to_string (hb_buffer_get_language (buffer));
const char *lang_end = lang ? strchr (lang, '-') : NULL;
@ -262,7 +250,7 @@ _hb_graphite2_shape (hb_shape_plan_t *shape_plan,
hb_tag_t script_tag[2];
hb_ot_tags_from_script (hb_buffer_get_script (buffer), &script_tag[0], &script_tag[1]);
seg = gr_make_seg (grfont, grface,
seg = gr_make_seg (NULL, grface,
script_tag[1] == HB_TAG_NONE ? script_tag[0] : script_tag[1],
feats,
gr_utf32, chars, buffer->len,
@ -373,7 +361,10 @@ _hb_graphite2_shape (hb_shape_plan_t *shape_plan,
}
buffer->len = glyph_count;
float yscale = font->y_scale / font->x_scale;
unsigned int upem = hb_face_get_upem (face);
float xscale = (float) font->x_scale / upem;
float yscale = (float) font->y_scale / upem;
yscale *= yscale / xscale;
/* Positioning. */
if (!HB_DIRECTION_IS_BACKWARD(buffer->props.direction))
{
@ -383,16 +374,16 @@ _hb_graphite2_shape (hb_shape_plan_t *shape_plan,
curradvx = 0;
for (is = gr_seg_first_slot (seg); is; pPos++, ++info, is = gr_slot_next_in_segment (is))
{
pPos->x_offset = gr_slot_origin_X (is) - curradvx;
pPos->x_offset = gr_slot_origin_X (is) * xscale - curradvx;
pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
if (info->cluster != currclus) {
pPos->x_advance = info->var1.i32;
pPos->x_advance = info->var1.i32 * xscale;
curradvx += pPos->x_advance;
currclus = info->cluster;
} else
pPos->x_advance = 0.;
pPos->y_advance = gr_slot_advance_Y (is, grface, grfont) * yscale;
pPos->y_advance = gr_slot_advance_Y (is, grface, NULL) * yscale;
curradvy += pPos->y_advance;
}
}
@ -401,20 +392,20 @@ _hb_graphite2_shape (hb_shape_plan_t *shape_plan,
int currclus = -1;
const hb_glyph_info_t *info = buffer->info;
hb_glyph_position_t *pPos = hb_buffer_get_glyph_positions (buffer, NULL);
curradvx = gr_seg_advance_X(seg);
curradvx = gr_seg_advance_X(seg) * xscale;
for (is = gr_seg_first_slot (seg); is; pPos++, info++, is = gr_slot_next_in_segment (is))
{
if (info->cluster != currclus)
{
pPos->x_advance = info->var1.i32;
if (currclus != -1) curradvx -= info[-1].var1.i32;
pPos->x_advance = info->var1.i32 * xscale;
if (currclus != -1) curradvx -= info[-1].var1.i32 * xscale;
currclus = info->cluster;
} else
pPos->x_advance = 0.;
pPos->y_advance = gr_slot_advance_Y (is, grface, grfont) * yscale;
pPos->y_advance = gr_slot_advance_Y (is, grface, NULL) * yscale;
curradvy -= pPos->y_advance;
pPos->x_offset = gr_slot_origin_X (is) - curradvx + pPos->x_advance;
pPos->x_offset = gr_slot_origin_X (is) * xscale - curradvx + pPos->x_advance;
pPos->y_offset = gr_slot_origin_Y (is) * yscale - curradvy;
}
hb_buffer_reverse_clusters (buffer);

4
src/hb-graphite2.h
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@ -39,9 +39,13 @@ HB_BEGIN_DECLS
HB_EXTERN gr_face *
hb_graphite2_face_get_gr_face (hb_face_t *face);
#ifndef HB_DISABLE_DEPRECATED
HB_EXTERN gr_font *
hb_graphite2_font_get_gr_font (hb_font_t *font);
#endif
HB_END_DECLS