I believe the tutorial has a page for it: http://www.freetype.org/freetype2/docs/tutorial/step2.html
See section 4b, namely the function
void compute_string_bbox( FT_BBox *abbox )
It basically adds up the bounding boxes of each character.
Effectively, the algorithm looks like:
0) M <- invalid bounding box
1) For each glyph G
1.1) Get kerning, advance pen
1.2) Get the bounding box as B
1.3) Add the pen position to B
1.4) Check if B is larger than the current bounding box M, if so, update it
1.5) Advance pen by G.advance
2) Check if box is valid, correct if necessary
The compute_string_bbox() function assumes that each character already has its position set (which includes kerning + advance), so if you haven't already computed that, use the psuedocode above will get you through.
On Wed, Apr 13, 2011 at 10:23 AM, Leonardo M. Ramé
<address@hidden> wrote:
Hi, I'm trying to place text over a bitmap using the function below.
If you take a look at the function, there's a "baseline" variable, in
charge of adjusting the top position of the character bitmap. If I don't
do this, all character ar aligned to the top "pen_y" point. I don't know
if this is the recommended way to align text. Please tell me if you know
a better way.
Also, I want to create a box filled in a color between the image and the
text. For example, the image in grayscale, then a red box with black text.
My question is, how can I get the measures (in pixels) of the box
containing all the text, not just each character.
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