static ALLEGRO_BITMAP *push_new_page(ALLEGRO_TTF_FONT_DATA *data, int glyph_size)
{
ALLEGRO_BITMAP **back;
ALLEGRO_BITMAP *page;
ALLEGRO_STATE state;
int page_size = 1;
/* 16 seems to work well. A particular problem are fixed width fonts which
* take an inordinate amount of space. */
while (page_size < 16 * glyph_size) {
page_size *= 2;
}
if (page_size < data->min_page_size) {
page_size = data->min_page_size;
}
if (page_size > data->max_page_size) {
page_size = data->max_page_size;
}
if (glyph_size > page_size) {
return NULL;
}
unlock_current_page(data);
/* The bitmap will be destroyed when the parent font is destroyed so
* it is not safe to register a destructor for it.
*/
_al_push_destructor_owner();
al_store_state(&state, ALLEGRO_STATE_NEW_BITMAP_PARAMETERS);
al_set_new_bitmap_format(data->bitmap_format);
al_set_new_bitmap_flags(data->bitmap_flags);
page = al_create_bitmap(page_size, page_size);
al_restore_state(&state);
_al_pop_destructor_owner();
if (page) {
back = _al_vector_alloc_back(&data->page_bitmaps);
*back = page;
data->page_pos_x = 0;
data->page_pos_y = 0;
data->page_line_height = 0;
}
return page;
}
// FIXME: Add a special case for when a single glyph rendering won't fit
// into 256x256 pixels.
static ALLEGRO_BITMAP *push_new_page(ALLEGRO_TTF_FONT_DATA *data)
{
ALLEGRO_BITMAP **back;
ALLEGRO_BITMAP *page;
ALLEGRO_STATE state;
unlock_current_page(data);
/* The bitmap will be destroyed when the parent font is destroyed so
* it is not safe to register a destructor for it.
*/
_al_push_destructor_owner();
al_store_state(&state, ALLEGRO_STATE_NEW_BITMAP_PARAMETERS);
al_set_new_bitmap_format(data->bitmap_format);
al_set_new_bitmap_flags(data->bitmap_flags);
page = al_create_bitmap(256, 256);
al_restore_state(&state);
_al_pop_destructor_owner();
back = _al_vector_alloc_back(&data->page_bitmaps);
*back = page;
/* Sometimes OpenGL will partly sample texels from the border of
* glyphs. So we better clear the texture to transparency.
* XXX This is very slow and avoidable with some effort.
*/
al_store_state(&state, ALLEGRO_STATE_TARGET_BITMAP);
al_hold_bitmap_drawing(false);
al_set_target_bitmap(*back);
al_clear_to_color(al_map_rgba_f(0, 0, 0, 0));
al_restore_state(&state);
data->page_pos_x = 0;
data->page_pos_y = 0;
data->page_line_height = 0;
return page;
}
