Hi all,
I am writing a text rendering library based on FreeType 2.3.5. and
encountered some problems.
One of the problems I encountered was translation of "empty" glyphs like
the space character ' '.
// assume chacater is loaded and copied to glyph[i]
FT_Glyph_Transform( glyph[i], NULL, &pen_pos[i] );
FT_Glyph_Get_CBox( glyph[i], FT_GLYPH_BBOX_PIXELS, &bbox );
FT_Glyph_To_Bitmap( glyph[i], FT_RENDER_MODE_NORMAL, NULL, 1 );
DrawBitmap( (FT_BitmapGlyph)glyph[i], clip_region, ... );
I also do some clipping in DrawBitmap(). Everything works just fine so
far, including clipping, mostly.
My goal is to determine if a glyph is inside the clip region, or
outside, or partially clipped. It works fine for most glyphs.
However for empty glyphs like ' ' it seems that the CBox (bbox) is all
zeros, and the bitmap->left and bitmap->top are also some unrelated
value that ignores the transform I set. For ' ' I was sort of expecting
a bbox with height 0 but with a real width and position.
Even if these characters don't need to be drawn anyway, I need to
determine if they are inside the clip_region.
How do I do that?
Thanks,
Mickey
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