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Allow for negative top/left offsets in composite overlays

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A top or left offset value of -1 will no longer mean that the
value is not set, but will now be an actual offset of -1.

INT_MIN for left & top will mean that the values are not set.

Co-authored-by: Christian Flintrup <chr@gigahost.dk>
This commit is contained in:
Manan Jadhav
2020-12-20 17:26:11 +00:00
committed by Lovell Fuller
parent 182beaa4a1
commit 02676140e8
8 changed files with 59 additions and 25 deletions
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12
src/common.cc
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@@ -658,26 +658,18 @@ namespace sharp {
int top = 0;
// assign only if valid
if (x >= 0 && x < (inWidth - outWidth)) {
if (x < (inWidth - outWidth)) {
left = x;
} else if (x >= (inWidth - outWidth)) {
left = inWidth - outWidth;
}
if (y >= 0 && y < (inHeight - outHeight)) {
if (y < (inHeight - outHeight)) {
top = y;
} else if (y >= (inHeight - outHeight)) {
top = inHeight - outHeight;
}
// the resulting left and top could have been outside the image after calculation from bottom/right edges
if (left < 0) {
left = 0;
}
if (top < 0) {
top = 0;
}
return std::make_tuple(left, top);
}