old
/
legacy-imlib2
3
0
Fork 4
Code Issues 1 Pull Requests Projects Releases Wiki Activity

scaling: Improve non-AA scale-up case 

Make source sampling more evenly distributed.
Most visible for small source dimensions.
This commit is contained in:
Kim Woelders 2023-08-07 18:35:18 +02:00
parent 29397453e4
commit 4d5b1413b1
1 changed files with 17 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/lib/scale.c
View File

@ -24,7 +24,7 @@ struct _imlib_scale_info {
#define YAP (yapoints[dyy + y])
static int *
__imlib_CalcPoints(int sw, int dw_, int b1, int b2)
__imlib_CalcPoints(int sw, int dw_, int b1, int b2, bool aa)
{
int *p, i;
int val, inc, dw, ss, dd;
@ -52,12 +52,21 @@ __imlib_CalcPoints(int sw, int dw_, int b1, int b2)
dd = dw - (b1 + b2);
if (dd > 0)
{
val = b1 << 16;
inc = (ss << 16) / dd;
for (; i < dw - b2; i++)
if (aa)
{
p[i] = val >> 16;
val += inc;
val = b1 << 16;
inc = (ss << 16) / dd;
for (; i < dw - b2; i++)
{
p[i] = val >> 16;
val += inc;
}
}
else
{
for (i = 0; i < dd; i++)
p[b1 + i] = b1 + (i * ss) / dd;
i = dw - b2;
}
}
@ -202,12 +211,12 @@ __imlib_CalcScaleInfo(ImlibImage * im, int sw, int sh, int dw, int dh, bool aa)
isi->xup_yup = (abs(dw) >= sw) + ((abs(dh) >= sh) << 1);
isi->xpoints = __imlib_CalcPoints(im->w, scw,
im->border.left, im->border.right);
im->border.left, im->border.right, aa);
if (!isi->xpoints)
goto bail;
isi->ypoints = __imlib_CalcPoints(im->h, sch,
im->border.top, im->border.bottom);
im->border.top, im->border.bottom, aa);
if (!isi->ypoints)
goto bail;