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[ft] Fix math

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This commit is contained in:
Behdad Esfahbod 2013-07-29 19:20:33 -04:00
parent 9444ef09cc
commit 7d26341072
1 changed files with 2 additions and 7 deletions
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9
src/cairo-ft-font.c
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@ -1252,16 +1252,11 @@ _get_bitmap_surface (FT_Bitmap *bitmap,
if (bitmap->num_grays != 256)
{
unsigned int x, y;
unsigned int shift;
switch (bitmap->num_grays) {
case 4: shift = 6; break;
case 16: shift = 4; break;
default: shift = 0; break;
}
unsigned int mul = 255 / (bitmap->num_grays - 1);
FT_Byte *p = bitmap->buffer;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++)
p[x] <<= shift;
p[x] *= mul;
p += bitmap->pitch;
}
}