I believe the tutorial has a page for it: http://www.freetype.org/freetype2/docs/tutorial/step2.html
<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 <[email protected]>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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