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overlayWith improvements: diff sizes/formats, gravity, buffer input

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Lovell Fuller
2016-02-29 14:30:29 +00:00
parent 55f204c6f9
commit d92ea31858
21 changed files with 407 additions and 242 deletions
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41
src/common.cc
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@@ -185,4 +185,45 @@ namespace sharp {
}
}
/*
Calculate the (left, top) coordinates of the output image
within the input image, applying the given gravity.
*/
std::tuple<int, int> CalculateCrop(int const inWidth, int const inHeight,
int const outWidth, int const outHeight, int const gravity) {
int left = 0;
int top = 0;
switch (gravity) {
case 1: // North
left = (inWidth - outWidth + 1) / 2;
break;
case 2: // East
left = inWidth - outWidth;
top = (inHeight - outHeight + 1) / 2;
break;
case 3: // South
left = (inWidth - outWidth + 1) / 2;
top = inHeight - outHeight;
break;
case 4: // West
top = (inHeight - outHeight + 1) / 2;
break;
case 5: // Northeast
left = inWidth - outWidth;
break;
case 6: // Southeast
left = inWidth - outWidth;
top = inHeight - outHeight;
case 7: // Southwest
top = inHeight - outHeight;
case 8: // Northwest
break;
default: // Centre
left = (inWidth - outWidth + 1) / 2;
top = (inHeight - outHeight + 1) / 2;
}
return std::make_tuple(left, top);
}
} // namespace sharp