devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Greyscale library: Always use reconstructing inversion, because it's legal to use unbuffered drawing functions in buffered mode, meaning that the chunky buffer might not be in sync with what's displayed. Mpegplayer does this.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16975 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-04-05 08:56:43 +00:00
parent 36f8fba209
commit 8f560bc2b5
1 changed files with 23 additions and 31 deletions
Download patch file Download diff file Expand all files Collapse all files

54
apps/plugins/lib/grey_core.c
View file

@ -253,41 +253,33 @@ static void invert_gvalues(void)
unsigned x = 0;
unsigned last_x;
if (_grey_info.flags & GREY_BUFFERED)
/* Step 1: Calculate a transposed table for undoing the old mapping */
for (i = 0; i < 256; i++)
{
fill_gvalues();
grey_update();
}
else /* Unbuffered - need crude reconstruction */
{
/* Step 1: Calculate a transposed table for undoing the old mapping */
for (i = 0; i < 256; i++)
last_x = x;
x = _grey_info.gvalue[i];
if (x > last_x)
{
last_x = x;
x = _grey_info.gvalue[i];
if (x > last_x)
{
rev_tab[last_x++] = (last_i + i) / 2;
while (x > last_x)
rev_tab[last_x++] = i;
last_i = i;
}
rev_tab[last_x++] = (last_i + i) / 2;
while (x > last_x)
rev_tab[last_x++] = i;
last_i = i;
}
rev_tab[last_x++] = (last_i + 255) / 2;
while (256 > last_x)
rev_tab[last_x++] = 255;
/* Step 2: Calculate new mapping */
fill_gvalues();
/* Step 3: Transpose all pixel values */
val = _grey_info.values;
end = val + _GREY_MULUQ(_grey_info.width, _grey_info.height);
do
*val = _grey_info.gvalue[rev_tab[*val]];
while (++val < end);
}
rev_tab[last_x++] = (last_i + 255) / 2;
while (256 > last_x)
rev_tab[last_x++] = 255;
/* Step 2: Calculate new mapping */
fill_gvalues();
/* Step 3: Transpose all pixel values */
val = _grey_info.values;
end = val + _GREY_MULUQ(_grey_info.width, _grey_info.height);
do
*val = _grey_info.gvalue[rev_tab[*val]];
while (++val < end);
}
#endif