Provided by: allegro5-doc_5.2.8.0-2_all 
NAME
al_get_glyph_dimensions - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro_font.h>
bool al_get_glyph_dimensions(const ALLEGRO_FONT *f,
int codepoint, int *bbx, int *bby, int *bbw, int *bbh)
DESCRIPTION
Sometimes, the al_get_glyph_width(3alleg5) or al_get_glyph_advance(3alleg5) functions are
not enough for exact glyph placement, so this function returns some additional
information, particularly if you want to draw the font vertically.
The function itself returns true if the character was present in font and false if the
character was not present in font.
Returned variables (all in pixel):
• bbx, bby - Offset to upper left corner of bounding box.
• bbw, bbh - Dimensions of bounding box.
These values are the same as al_get_text_dimensions(3alleg5) would return for a string of
a single character equal to the glyph passed to this function. Note that glyphs may go to
the left and upwards of the X, in which case x and y will have negative values.
If you want to draw a string verticallly, for Japanese or as a game effect, then you
should leave bby + bbh space between the glyphs in the y direction for a regular
placement.
If you want to draw a string horizontally in an extra compact way,
then you should leave bbx + bbw space between the glyphs in the x direction for a compact
placement.
In the figure below is an example of what bbx and bby may be like for a 2 glyph, and a g
glyph of the same font compared to the result of al_get_glyph_width().
al_get_glyph_width() al_get_glyph_width()
__|___ __|__
/ \ / \
bbx bbw bbx bbw
<-->+<------>+ <-->+<----->+ X baseline
^ | | ^ | |
bby | | | bby | | |
v | | | | |
+---+--------+ | | |
^ | ***** | | | |
| |* ** | v | |
bbh | | ** | bbh +---+-------+
| | ** | ^ | ***** |
v |********| | |* *|
+---+--------+ | | ***** |
| | *|
| | * *|
v | **** |
+---+-------+
SINCE
5.1.12
SEE ALSO
al_draw_glyph(3alleg5), al_get_glyph_width(3alleg5), al_get_glyph_advance(3alleg5).