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Add correct font's height calculation using AGG 

Compute the height like in renderer.c
This commit is contained in:
Francesco Abbate 2020-05-30 16:26:10 +02:00
parent 0fea5d9d25
commit 010966d60d
2 changed files with 13 additions and 3 deletions
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8
src/font_render_lcd.h
View File

@ -68,6 +68,14 @@ public:
return false;
}
float scale_for_em_to_pixels(float size) {
int units_per_em = m_feng.face_units_em();
if (units_per_em > 0) {
return size / units_per_em;
}
return 0.0;
}
bool load_font(const char *font_filename) {
if(m_feng.load_font(font_filename, 0, agg::glyph_ren_outline)) {
m_font_loaded = true;

8
tests/agg_font_render_test.cpp
View File

@ -66,9 +66,11 @@ RenFontA* ren_load_font_agg(const char *filename, float size) {
font->renderer->get_font_vmetrics(ascender, descender);
fprintf(stderr, "Font metrics ascender: %d descender: %d\n", ascender, descender);
// FIXME: figure out correct calculation for font->height with
// ascent, descent and linegap.
font->height = size;
float scale = font->renderer->scale_for_em_to_pixels(size);
font->height = (ascender - descender) * scale + 0.5;
fprintf(stderr, "Font height: %d\n", font->height);
return font;
}