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Add TrueType kern support

This commit is contained in:
Behdad Esfahbod 2009-12-20 17:24:05 +01:00
parent 2c1b85cf66
commit 001fc2d2aa
1 changed files with 48 additions and 26 deletions
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74
src/hb-shape.c
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@ -49,6 +49,37 @@ hb_form_clusters (hb_buffer_t *buffer)
IN_CLUSTER (buffer->in_pos) = IN_CLUSTER (buffer->in_pos - 1);
}
static hb_direction_t
hb_ensure_native_direction (hb_buffer_t *buffer)
{
hb_direction_t original_direction = buffer->direction;
/* TODO vertical */
if (HB_DIRECTION_IS_HORIZONTAL (original_direction) &&
original_direction != _hb_script_get_horizontal_direction (buffer->script))
{
hb_buffer_reverse_clusters (buffer);
buffer->direction ^= 1;
}
return original_direction;
}
static void
hb_mirror_chars (hb_buffer_t *buffer)
{
unsigned int count;
hb_unicode_get_mirroring_func_t get_mirroring = buffer->unicode->get_mirroring;
if (HB_DIRECTION_IS_FORWARD (buffer->direction))
return;
count = buffer->in_length;
for (buffer->in_pos = 0; buffer->in_pos < count; buffer->in_pos++) {
IN_CURGLYPH() = get_mirroring (IN_CURGLYPH());
}
}
static void
hb_map_glyphs (hb_font_t *font,
hb_face_t *face,
@ -86,39 +117,25 @@ hb_position_default (hb_font_t *font,
}
}
static hb_direction_t
hb_ensure_native_direction (hb_buffer_t *buffer)
{
hb_direction_t original_direction = buffer->direction;
/* TODO vertical */
if (HB_DIRECTION_IS_HORIZONTAL (original_direction) &&
original_direction != _hb_script_get_horizontal_direction (buffer->script))
{
hb_buffer_reverse_clusters (buffer);
buffer->direction ^= 1;
}
return original_direction;
}
static void
hb_mirror_chars (hb_buffer_t *buffer)
hb_truetype_kern (hb_font_t *font,
hb_face_t *face,
hb_buffer_t *buffer)
{
unsigned int count;
hb_unicode_get_mirroring_func_t get_mirroring = buffer->unicode->get_mirroring;
if (HB_DIRECTION_IS_FORWARD (buffer->direction))
return;
count = buffer->in_length;
for (buffer->in_pos = 0; buffer->in_pos < count; buffer->in_pos++) {
IN_CURGLYPH() = get_mirroring (IN_CURGLYPH());
for (buffer->in_pos = 1; buffer->in_pos < count; buffer->in_pos++) {
hb_position_t kern, kern1, kern2;
kern = hb_font_get_kerning (font, face, IN_GLYPH(buffer->in_pos - 1), IN_CURGLYPH());
kern1 = kern >> 1;
kern2 = kern - kern1;
POSITION(buffer->in_pos - 1)->x_advance += kern1;
CURPOSITION()->x_advance += kern2;
CURPOSITION()->x_offset += kern2;
}
}
void
hb_shape (hb_font_t *font,
hb_face_t *face,
@ -127,6 +144,7 @@ hb_shape (hb_font_t *font,
unsigned int num_features)
{
hb_direction_t original_direction;
hb_bool_t complex_positioning_applied;
hb_form_clusters (buffer);
original_direction = hb_ensure_native_direction (buffer);
@ -144,10 +162,14 @@ hb_shape (hb_font_t *font,
hb_position_default (font, face, buffer);
/* GPOS / kern */
/* GPOS */
complex_positioning_applied = FALSE;
if (HB_DIRECTION_IS_BACKWARD (buffer->direction))
hb_buffer_reverse (buffer);
if (!complex_positioning_applied)
hb_truetype_kern (font, face, buffer);
buffer->direction = original_direction;
}