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Ephoto: Cleanup dithering code, still needs improvement.

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v-1.6.0
Stephen okra Houston 8 years ago
parent ab8edacd0d
commit 51a8be20a6
1 changed files with 98 additions and 60 deletions
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  1. 158
      src/bin/ephoto_filters.c

158
src/bin/ephoto_filters.c
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@ -630,91 +630,129 @@ static Eina_Bool
_dither(void *data)
{
Ephoto_Filter *ef = data;
unsigned int *p1, *p2;
int a, r, g, b, passes = 0;
int aa, rr, gg, bb;
int aaa, rrr, ggg, bbb;
int erra, errr, errg, errb;
Evas_Coord x, y, w, h;
int a, r, g, b, passes = 0;
int rr, gg, bb;
int errr, errg, errb;
w = ef->w;
h = ef->h;
for (y = ef->pos; y < h; y++)
{
for (x = 1; x < w; x++)
for (x = 0; x < w; x++)
{
p1 = ef->im_data + (y * w) + x;
p2 = ef->im_data_new + (y * w) + x;
b = (int) (*p1 & 0xff);
g = (int) ((*p1 >> 8) & 0xff);
r = (int) ((*p1 >> 16) & 0xff);
a = (int) ((*p1 >> 24) & 0xff);
int index = y * w + x;
b = (ef->im_data[index]) & 0xff;
g = ((ef->im_data[index] >> 8) & 0xff);
r = ((ef->im_data[index] >> 16) & 0xff);
a = ((ef->im_data[index] >> 24) & 0xff);
b = _mul_color_alpha(b, a);
g = _mul_color_alpha(g, a);
r = _mul_color_alpha(r, a);
bb = (b > 127) ? 255 : 0;
gg = (g > 127) ? 255 : 0;
rr = (r > 127) ? 255 : 0;
aa = (a > 127) ? 255 : 0;
*p2 = (aa << 24) | (rr << 16) | (gg << 8) | bb;
rr = _normalize_color(rr);
gg = _normalize_color(gg);
bb = _normalize_color(bb);
bb = _demul_color_alpha(bb, a);
gg = _demul_color_alpha(gg, a);
rr = _demul_color_alpha(rr, a);
ef->im_data_new[index] = (a << 24) | (rr << 16) |
(gg << 8) | bb;
errb = b - bb;
errg = g - gg;
errr = r - rr;
erra = a - aa;
if ((x+1) < w)
{
p1 = ef->im_data + (y * w) + (x+1);
p2 = ef->im_data_new + (y * w) + (x+1);
bbb = (int) (*p1 & 0xff) + (7.0/16) * errb;
ggg = (int) ((*p1 >> 8) & 0xff) + (7.0/16) * errg;
rrr = (int) ((*p1 >> 16) & 0xff) + (7.0/16) * errr;
aaa = (int) ((*p1 >> 24) & 0xff) + (7.0/16) * erra;
bbb = _normalize_color(bbb);
ggg = _normalize_color(ggg);
rrr = _normalize_color(rrr);
aaa = _normalize_color(aaa);
*p2 = (aaa << 24) | (rrr << 16) | (ggg << 8) | bbb;
index = y * w + x + 1;
b = (ef->im_data[index] & 0xff);
g = ((ef->im_data[index] >> 8) & 0xff);
r = ((ef->im_data[index] >> 16) & 0xff);
a = ((ef->im_data[index] >> 24) & 0xff);
b = _mul_color_alpha(b, a);
g = _mul_color_alpha(g, a);
r = _mul_color_alpha(r, a);
bb = b + ((7 * errb) >> 4);
gg = g + ((7 * errg) >> 4);
rr = r + ((7 * errr) >> 4);
bb = _normalize_color(bb);
gg = _normalize_color(gg);
rr = _normalize_color(rr);
bb = _demul_color_alpha(bb, a);
gg = _demul_color_alpha(gg, a);
rr = _demul_color_alpha(rr, a);
ef->im_data_new[index] = (a << 24) | (rr << 16) |
(gg << 8) | bb;
}
if ((y+1) < h)
if (x > 0 && (y+1) < h)
{
p1 = ef->im_data + ((y+1) * w) + (x-1);
p2 = ef->im_data_new + ((y+1) * w) + (x-1);
bbb = (int) (*p1 & 0xff) + (3.0/16) * errb;
ggg = (int) ((*p1 >> 8) & 0xff) + (3.0/16) * errg;
rrr = (int) ((*p1 >> 16) & 0xff) + (3.0/16) * errr;
aaa = (int) ((*p1 >> 24) & 0xff) + (3.0/16) * erra;
bbb = _normalize_color(bbb);
ggg = _normalize_color(ggg);
rrr = _normalize_color(rrr);
aaa = _normalize_color(aaa);
*p2 = (aaa << 24) | (rrr << 16) | (ggg << 8) | bbb;
index = (y + 1) * w + (x - 1);
b = (ef->im_data[index] & 0xff);
g = ((ef->im_data[index] >> 8) & 0xff);
r = ((ef->im_data[index] >> 16) & 0xff);
a = ((ef->im_data[index] >> 24) & 0xff);
b = _mul_color_alpha(b, a);
g = _mul_color_alpha(g, a);
r = _mul_color_alpha(r, a);
bb = b + ((3 * errb) >> 4);
gg = g + ((3 * errg) >> 4);
rr = r + ((3 * errr) >> 4);
bb = _normalize_color(bb);
gg = _normalize_color(gg);
rr = _normalize_color(rr);
bb = _demul_color_alpha(bb, a);
gg = _demul_color_alpha(gg, a);
rr = _demul_color_alpha(rr, a);
ef->im_data_new[index] = (a << 24) | (rr << 16) |
(gg << 8) | bb;
}
if ((y+1) < h)
{
p1 = ef->im_data + ((y+1) * w) + x;
p2 = ef->im_data_new + ((y+1) * w) + x;
bbb = (int) (*p1 & 0xff) + (5.0/16) * errb;
ggg = (int) ((*p1 >> 8) & 0xff) + (5.0/16) * errg;
rrr = (int) ((*p1 >> 16) & 0xff) + (5.0/16) * errr;
aaa = (int) ((*p1 >> 24) & 0xff) + (5.0/16) * erra;
bbb = _normalize_color(bbb);
ggg = _normalize_color(ggg);
rrr = _normalize_color(rrr);
aaa = _normalize_color(aaa);
*p2 = (aaa << 24) | (rrr << 16) | (ggg << 8) | bbb;
index = (y + 1) * w + x;
b = (ef->im_data[index] & 0xff);
g = ((ef->im_data[index] >> 8) & 0xff);
r = ((ef->im_data[index] >> 16) & 0xff);
a = ((ef->im_data[index] >> 24) & 0xff);
b = _mul_color_alpha(b, a);
g = _mul_color_alpha(g, a);
r = _mul_color_alpha(r, a);
bb = b + ((5 * errb) >> 4);
gg = g + ((5 * errg) >> 4);
rr = r + ((5 * errr) >> 4);
bb = _normalize_color(bb);
gg = _normalize_color(gg);
rr = _normalize_color(rr);
bb = _demul_color_alpha(bb, a);
gg = _demul_color_alpha(gg, a);
rr = _demul_color_alpha(rr, a);
ef->im_data_new[index] = (a << 24) | (rr << 16) |
(gg << 8) | bb;
}
if ((y+1) < h && (x+1) < w)
{
p1 = ef->im_data + ((y+1) * w) + (x+1);
p2 = ef->im_data_new + ((y+1) * w) + (x+1);
bbb = (int) (*p1 & 0xff) + (1.0/16) * errb;
ggg = (int) ((*p1 >> 8) & 0xff) + (1.0/16) * errg;
rrr = (int) ((*p1 >> 16) & 0xff) + (1.0/16) * errr;
aaa = (int) ((*p1 >> 24) & 0xff) + (1.0/16) * erra;
bbb = _normalize_color(bbb);
ggg = _normalize_color(ggg);
rrr = _normalize_color(rrr);
aaa = _normalize_color(aaa);
*p2 = (aaa << 24) | (rrr << 16) | (ggg << 8) | bbb;
index = (y + 1) * w + (x + 1);
b = (ef->im_data[index] & 0xff);
g = ((ef->im_data[index] >> 8) & 0xff);
r = ((ef->im_data[index] >> 16) & 0xff);
a = ((ef->im_data[index] >> 24) & 0xff);
b = _mul_color_alpha(b, a);
g = _mul_color_alpha(g, a);
r = _mul_color_alpha(r, a);
bb = b + ((1 * errb) >> 4);
gg = g + ((1 * errg) >> 4);
rr = r + ((1 * errr) >> 4);
bb = _normalize_color(bb);
gg = _normalize_color(gg);
rr = _normalize_color(rr);
bb = _demul_color_alpha(bb, a);
gg = _demul_color_alpha(gg, a);
rr = _demul_color_alpha(rr, a);
ef->im_data_new[index] = (a << 24) | (rr << 16) |
(gg << 8) | bb;
}
}
passes++;

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