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Separate nil font-funcs from parent-peeking font-funcs

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API change: all fonts created with hb_font_create() now inherit from
(ie have parent) hb_font_get_empty().
pull/158/merge
Behdad Esfahbod 9 years ago
parent bee901b38e
commit da29b43794
2 changed files with 145 additions and 68 deletions
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  1. 211
      src/hb-font.cc
  2. 2
      test/api/test-font.c

211
src/hb-font.cc
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@ -45,130 +45,176 @@
*/
static hb_bool_t
hb_font_get_glyph_nil (hb_font_t *font,
hb_font_get_glyph_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t unicode,
hb_codepoint_t variation_selector,
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
if (font->parent)
return font->parent->get_glyph (unicode, variation_selector, glyph);
*glyph = 0;
return false;
}
static hb_bool_t
hb_font_get_glyph_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t unicode,
hb_codepoint_t variation_selector,
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
return font->parent->get_glyph (unicode, variation_selector, glyph);
}
static hb_position_t
hb_font_get_glyph_h_advance_nil (hb_font_t *font,
hb_font_get_glyph_h_advance_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
void *user_data HB_UNUSED)
{
if (font->parent)
return font->parent_scale_x_distance (font->parent->get_glyph_h_advance (glyph));
return font->x_scale;
}
static hb_position_t
hb_font_get_glyph_h_advance_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
void *user_data HB_UNUSED)
{
return font->parent_scale_x_distance (font->parent->get_glyph_h_advance (glyph));
}
static hb_position_t
hb_font_get_glyph_v_advance_nil (hb_font_t *font,
hb_font_get_glyph_v_advance_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
void *user_data HB_UNUSED)
{
if (font->parent)
return font->parent_scale_y_distance (font->parent->get_glyph_v_advance (glyph));
return font->y_scale;
}
static hb_position_t
hb_font_get_glyph_v_advance_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
void *user_data HB_UNUSED)
{
return font->parent_scale_y_distance (font->parent->get_glyph_v_advance (glyph));
}
static hb_bool_t
hb_font_get_glyph_h_origin_nil (hb_font_t *font,
hb_font_get_glyph_h_origin_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
hb_position_t *x,
hb_position_t *y,
void *user_data HB_UNUSED)
{
if (font->parent) {
hb_bool_t ret = font->parent->get_glyph_h_origin (glyph, x, y);
if (ret)
font->parent_scale_position (x, y);
return ret;
}
*x = *y = 0;
return false;
}
static hb_bool_t
hb_font_get_glyph_h_origin_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
hb_position_t *x,
hb_position_t *y,
void *user_data HB_UNUSED)
{
hb_bool_t ret = font->parent->get_glyph_h_origin (glyph, x, y);
if (ret)
font->parent_scale_position (x, y);
return ret;
}
static hb_bool_t
hb_font_get_glyph_v_origin_nil (hb_font_t *font,
hb_font_get_glyph_v_origin_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
hb_position_t *x,
hb_position_t *y,
void *user_data HB_UNUSED)
{
if (font->parent) {
hb_bool_t ret = font->parent->get_glyph_v_origin (glyph, x, y);
if (ret)
font->parent_scale_position (x, y);
return ret;
}
*x = *y = 0;
return false;
}
static hb_bool_t
hb_font_get_glyph_v_origin_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
hb_position_t *x,
hb_position_t *y,
void *user_data HB_UNUSED)
{
hb_bool_t ret = font->parent->get_glyph_v_origin (glyph, x, y);
if (ret)
font->parent_scale_position (x, y);
return ret;
}
static hb_position_t
hb_font_get_glyph_h_kerning_nil (hb_font_t *font,
hb_font_get_glyph_h_kerning_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t left_glyph,
hb_codepoint_t right_glyph,
void *user_data HB_UNUSED)
{
if (font->parent)
return font->parent_scale_x_distance (font->parent->get_glyph_h_kerning (left_glyph, right_glyph));
return 0;
}
static hb_position_t
hb_font_get_glyph_h_kerning_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t left_glyph,
hb_codepoint_t right_glyph,
void *user_data HB_UNUSED)
{
return font->parent_scale_x_distance (font->parent->get_glyph_h_kerning (left_glyph, right_glyph));
}
static hb_position_t
hb_font_get_glyph_v_kerning_nil (hb_font_t *font,
hb_font_get_glyph_v_kerning_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t top_glyph,
hb_codepoint_t bottom_glyph,
void *user_data HB_UNUSED)
{
if (font->parent)
return font->parent_scale_y_distance (font->parent->get_glyph_v_kerning (top_glyph, bottom_glyph));
return 0;
}
static hb_position_t
hb_font_get_glyph_v_kerning_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t top_glyph,
hb_codepoint_t bottom_glyph,
void *user_data HB_UNUSED)
{
return font->parent_scale_y_distance (font->parent->get_glyph_v_kerning (top_glyph, bottom_glyph));
}
static hb_bool_t
hb_font_get_glyph_extents_nil (hb_font_t *font,
hb_font_get_glyph_extents_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
hb_glyph_extents_t *extents,
void *user_data HB_UNUSED)
{
if (font->parent) {
hb_bool_t ret = font->parent->get_glyph_extents (glyph, extents);
if (ret) {
font->parent_scale_position (&extents->x_bearing, &extents->y_bearing);
font->parent_scale_distance (&extents->width, &extents->height);
}
return ret;
}
memset (extents, 0, sizeof (*extents));
return false;
}
static hb_bool_t
hb_font_get_glyph_extents_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
hb_glyph_extents_t *extents,
void *user_data HB_UNUSED)
{
hb_bool_t ret = font->parent->get_glyph_extents (glyph, extents);
if (ret) {
font->parent_scale_position (&extents->x_bearing, &extents->y_bearing);
font->parent_scale_distance (&extents->width, &extents->height);
}
return ret;
}
static hb_bool_t
hb_font_get_glyph_contour_point_nil (hb_font_t *font,
hb_font_get_glyph_contour_point_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
unsigned int point_index,
@ -176,44 +222,63 @@ hb_font_get_glyph_contour_point_nil (hb_font_t *font,
hb_position_t *y,
void *user_data HB_UNUSED)
{
if (font->parent) {
hb_bool_t ret = font->parent->get_glyph_contour_point (glyph, point_index, x, y);
if (ret)
font->parent_scale_position (x, y);
return ret;
}
*x = *y = 0;
return false;
}
static hb_bool_t
hb_font_get_glyph_contour_point_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
unsigned int point_index,
hb_position_t *x,
hb_position_t *y,
void *user_data HB_UNUSED)
{
hb_bool_t ret = font->parent->get_glyph_contour_point (glyph, point_index, x, y);
if (ret)
font->parent_scale_position (x, y);
return ret;
}
static hb_bool_t
hb_font_get_glyph_name_nil (hb_font_t *font,
hb_font_get_glyph_name_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
char *name, unsigned int size,
void *user_data HB_UNUSED)
{
if (font->parent)
return font->parent->get_glyph_name (glyph, name, size);
if (size) *name = '\0';
return false;
}
static hb_bool_t
hb_font_get_glyph_name_parent (hb_font_t *font,
void *font_data HB_UNUSED,
hb_codepoint_t glyph,
char *name, unsigned int size,
void *user_data HB_UNUSED)
{
return font->parent->get_glyph_name (glyph, name, size);
}
static hb_bool_t
hb_font_get_glyph_from_name_nil (hb_font_t *font,
hb_font_get_glyph_from_name_nil (hb_font_t *font HB_UNUSED,
void *font_data HB_UNUSED,
const char *name, int len, /* -1 means nul-terminated */
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
if (font->parent)
return font->parent->get_glyph_from_name (name, len, glyph);
*glyph = 0;
return false;
}
static hb_bool_t
hb_font_get_glyph_from_name_parent (hb_font_t *font,
void *font_data HB_UNUSED,
const char *name, int len, /* -1 means nul-terminated */
hb_codepoint_t *glyph,
void *user_data HB_UNUSED)
{
return font->parent->get_glyph_from_name (name, len, glyph);
}
static const hb_font_funcs_t _hb_font_funcs_nil = {
@ -227,6 +292,17 @@ static const hb_font_funcs_t _hb_font_funcs_nil = {
#undef HB_FONT_FUNC_IMPLEMENT
}
};
static const hb_font_funcs_t _hb_font_funcs_parent = {
HB_OBJECT_HEADER_STATIC,
true, /* immutable */
{
#define HB_FONT_FUNC_IMPLEMENT(name) hb_font_get_##name##_parent,
HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
#undef HB_FONT_FUNC_IMPLEMENT
}
};
/**
@ -246,7 +322,7 @@ hb_font_funcs_create (void)
if (!(ffuncs = hb_object_create<hb_font_funcs_t> ()))
return hb_font_funcs_get_empty ();
ffuncs->get = _hb_font_funcs_nil.get;
ffuncs->get = _hb_font_funcs_parent.get;
return ffuncs;
}
@ -263,7 +339,7 @@ hb_font_funcs_create (void)
hb_font_funcs_t *
hb_font_funcs_get_empty (void)
{
return const_cast<hb_font_funcs_t *> (&_hb_font_funcs_nil);
return const_cast<hb_font_funcs_t *> (&_hb_font_funcs_parent);
}
/**
@ -402,7 +478,7 @@ hb_font_funcs_set_##name##_func (hb_font_funcs_t *ffuncs, \
ffuncs->user_data.name = user_data; \
ffuncs->destroy.name = destroy; \
} else { \
ffuncs->get.name = hb_font_get_##name##_nil; \
ffuncs->get.name = hb_font_get_##name##_parent; \
ffuncs->user_data.name = NULL; \
ffuncs->destroy.name = NULL; \
} \
@ -858,6 +934,7 @@ hb_font_create (hb_face_t *face)
return hb_font_get_empty ();
hb_face_make_immutable (face);
font->parent = hb_font_get_empty ();
font->face = hb_face_reference (face);
font->klass = hb_font_funcs_get_empty ();
@ -917,8 +994,8 @@ hb_font_get_empty (void)
NULL, /* parent */
const_cast<hb_face_t *> (&_hb_face_nil),
0, /* x_scale */
0, /* y_scale */
1000, /* x_scale */
1000, /* y_scale */
0, /* x_ppem */
0, /* y_ppem */

2
test/api/test-font.c
Unescape View File

@ -386,7 +386,7 @@ test_font_properties (void)
g_assert (hb_font_get_face (font) == face);
g_assert (hb_font_get_parent (font) == NULL);
g_assert (hb_font_get_parent (font) == hb_font_get_empty ());
subfont = hb_font_create_sub_font (font);
g_assert (hb_font_get_parent (subfont) == font);
hb_font_set_parent(subfont, NULL);

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