The code in FT_Embolden_Bitmap takes a bitmap and produces a bold
version of it. I want to do this to use as an outline for my glyphs.
The code creates a new bitmap which may have a new pitch and then enters
a loop to copy the data from the old bitmap to the new bitmap a scan
line at a time.
However if there was extra padding in the original bitmap it's possible
for the new bold bitmap to have a smaller pitch than the original
bitmap. This is often the
case if the original bitmap was produced by the monochrome Freetype
renderer which pads bitmaps to a 16 bit boundary.
My fix is to compute the number of bytes to copy from the pixel width
rather than just using the pitch.
int nBytesToCopy = ( bitmap->width + ppb - 1 ) / ppb;
if ( bitmap->pitch > 0 )
{
for ( i = 0; i < bitmap->rows; i++ )
FT_MEM_COPY( buffer + new_pitch * ( ypixels + i ),
bitmap->buffer + pitch * i, nBytesToCopy );
}
else
{
for ( i = 0; i < bitmap->rows; i++ )
FT_MEM_COPY( buffer + new_pitch * i,
bitmap->buffer + pitch * i, nBytesToCopy );
}
What do you think ?
- Ted Packard
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