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Add font vmetrics in AGG font renderer test

This commit is contained in:
Francesco Abbate 2020-05-30 15:19:12 +02:00
parent 4701c2899c
commit 155e76df5f
2 changed files with 17 additions and 0 deletions
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13
src/font_render_lcd.h
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@ -55,6 +55,19 @@ public:
m_gamma_lut.gamma(m_gamma); m_gamma_lut.gamma(m_gamma);
} }
bool get_font_vmetrics(int& ascender, int& descender) {
int face_height = m_feng.face_height();
if (face_height > 0) {
double current_height = m_feng.height();
m_feng.height(1.0);
ascender = m_feng.ascender() * face_height;
descender = m_feng.descender() * face_height;
m_feng.height(current_height);
return true;
}
return false;
}
bool load_font(const char *font_filename) { bool load_font(const char *font_filename) {
if(m_feng.load_font(font_filename, 0, agg::glyph_ren_outline)) { if(m_feng.load_font(font_filename, 0, agg::glyph_ren_outline)) {
m_font_loaded = true; m_font_loaded = true;

4
tests/agg_font_render_test.cpp
View File

@ -62,6 +62,10 @@ RenFontA* ren_load_font_agg(const char *filename, float size) {
font->renderer = new font_renderer_lcd(true, false, false, 1.8); font->renderer = new font_renderer_lcd(true, false, false, 1.8);
font->renderer->load_font(filename); font->renderer->load_font(filename);
int ascender, descender;
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 // FIXME: figure out correct calculation for font->height with
// ascent, descent and linegap. // ascent, descent and linegap.
font->height = size; font->height = size;