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egg-palettize: implement mirror and border-color wrap modes

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Closes: #192
This commit is contained in:
rdb 2017-11-11 23:59:47 +01:00
parent 404842e70b
commit 4b4e11c085
1 changed files with 40 additions and 4 deletions
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44
pandatool/src/palettizer/texturePlacement.cxx
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@ -740,25 +740,61 @@ fill_image(PNMImage &image) {
for (int y = _placed._y; y < _placed._y + _placed._y_size; y++) {
int sy = y - top;
if (_placed._wrap_v == EggTexture::WM_clamp) {
switch (_placed._wrap_v) {
case EggTexture::WM_clamp:
// Clamp at [0, y_size).
sy = max(min(sy, y_size - 1), 0);
break;
} else {
case EggTexture::WM_mirror:
sy = (sy < 0) ? (y_size * 2) - 1 - ((-sy - 1) % (y_size * 2)) : sy % (y_size * 2);
sy = (sy < y_size) ? sy : 2 * y_size - sy - 1;
break;
case EggTexture::WM_mirror_once:
sy = (sy < y_size) ? sy : 2 * y_size - sy - 1;
// Fall through
case EggTexture::WM_border_color:
if (sy < 0 || sy >= y_size) {
continue;
}
break;
default:
// Wrap: sign-independent modulo.
sy = (sy < 0) ? y_size - 1 - ((-sy - 1) % y_size) : sy % y_size;
break;
}
for (int x = _placed._x; x < _placed._x + _placed._x_size; x++) {
int sx = x - left;
if (_placed._wrap_u == EggTexture::WM_clamp) {
switch (_placed._wrap_u) {
case EggTexture::WM_clamp:
// Clamp at [0, x_size).
sx = max(min(sx, x_size - 1), 0);
break;
} else {
case EggTexture::WM_mirror:
sx = (sx < 0) ? (x_size * 2) - 1 - ((-sx - 1) % (x_size * 2)) : sx % (x_size * 2);
sx = (sx < x_size) ? sx : 2 * x_size - sx - 1;
break;
case EggTexture::WM_mirror_once:
sx = (sx >= 0) ? sx : ~sx;
// Fall through
case EggTexture::WM_border_color:
if (sx < 0 || sx >= x_size) {
continue;
}
break;
default:
// Wrap: sign-independent modulo.
sx = (sx < 0) ? x_size - 1 - ((-sx - 1) % x_size) : sx % x_size;
break;
}
image.set_xel(x, y, source.get_xel(sx, sy));