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Font: compute baseline_offset

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This commit is contained in:
Josh Holtrop 2014-07-26 11:02:37 -04:00
parent de5b4e7413
commit 5c52ed0c4d
1 changed files with 13 additions and 8 deletions
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21
src/Font.cc
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@ -95,10 +95,13 @@ static VALUE Font_new(VALUE klass, VALUE fname, VALUE size)
FT_Set_Pixel_Sizes(font->face, 0, NUM2INT(size)); FT_Set_Pixel_Sizes(font->face, 0, NUM2INT(size));
static const char preload_glyphs[] = "HMgjqxy_|^"; static const char preload_glyphs[] = "HMgjqxy_|^";
int max_top = -9999;
int min_bottom = 9999;
for (unsigned int i = 0; i < sizeof(preload_glyphs) - 1u; i++) for (unsigned int i = 0; i < sizeof(preload_glyphs) - 1u; i++)
{ {
if (get_glyph(font, preload_glyphs[i]) == NULL) GlyphRef g = get_glyph(font, preload_glyphs[i]);
if (g == NULL)
{ {
delete font; delete font;
rb_raise(rb_eRuntimeError, rb_raise(rb_eRuntimeError,
@ -106,18 +109,20 @@ static VALUE Font_new(VALUE klass, VALUE fname, VALUE size)
preload_glyphs[i], preload_glyphs[i],
fname_cstr); fname_cstr);
} }
if (font->face->glyph->bitmap_top > max_top)
max_top = font->face->glyph->bitmap_top;
int bitmap_bottom = font->face->glyph->bitmap_top - font->face->glyph->bitmap.rows;
if (bitmap_bottom < min_bottom)
min_bottom = bitmap_bottom;
} }
#if 0 int line_height = round_up_26_6(font->face->size->metrics.height);
m_baseline_offset = round_up_26_6((m_face->size->metrics.height - (m_face->size->metrics.ascender - m_face->size->metrics.descender)) / 2 - m_face->size->metrics.descender); int baseline_offset = (line_height - (max_top - min_bottom)) / 2;
#endif
#if 0
m_baseline_offset = 1 - m_face->glyph->bitmap_top + m_face->glyph->bitmap.rows;
#endif
VALUE rv = Data_Wrap_Struct(klass, NULL, Font_free, font); VALUE rv = Data_Wrap_Struct(klass, NULL, Font_free, font);
rb_iv_set(rv, "@advance", INT2FIX(get_glyph(font, 'x')->get_advance())); rb_iv_set(rv, "@advance", INT2FIX(get_glyph(font, 'x')->get_advance()));
rb_iv_set(rv, "@line_height", INT2FIX(round_up_26_6(font->face->size->metrics.height))); rb_iv_set(rv, "@line_height", INT2FIX(line_height));
rb_iv_set(rv, "@baseline_offset", INT2FIX(baseline_offset));
return rv; return rv;
} }