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Evas font: Compress font algo should round instead of floor 

This is an attempt at having higher quality font rendering
while still using RLE-based font compression.
This commit is contained in:
Jean-Philippe Andre 2014-12-08 13:50:44 +09:00
parent 378157ba1e
commit 52d117c905
1 changed files with 8 additions and 1 deletions
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9
src/lib/evas/common/evas_font_compress.c
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@ -151,6 +151,9 @@ compress_rle4(DATA8 *src, int pitch, int w, int h, int *size_ret)
{
// we only need upper 4 bits of value for span creation
DATA8 v = pix[x] >> 4;
// round-up if closer to upper value
if ((pix[x] & 0x8) && (v != 0xF))
v++;
// if the current pixel value (in 4bit) is not the same as the
// span value (n 4 bit) OR... if the span now exceeds 16 pixels
// then add/write out the span to our RLE span blob
@ -344,7 +347,11 @@ compress_bpp4(DATA8 *src, int pitch, int w, int h, int *size_ret)
// 4 bits only needed) and pack
for (x = 0; x < (w - 1); x += 2)
{
*d = (s[0] & 0xf0) | (s[1] >> 4);
DATA8 v1 = s[0] >> 4;
DATA8 v2 = s[1] >> 4;
if ((s[0] & 0x08) && (v1 != 0x0f)) v1++;
if ((s[1] & 0x08) && (v2 != 0x0f)) v2++;
*d = (v1 << 4) | v2;
s += 2;
d++;
}