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Ensure trim op supports image-in-alpha #1597

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Lovell Fuller
2019-11-14 11:29:45 +00:00
parent 833aaead56
commit c41b87303d
7 changed files with 37 additions and 3 deletions
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16
src/operations.cc
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@@ -266,12 +266,22 @@ namespace sharp {
if (HasAlpha(background)) {
background = background.flatten();
}
int top, width, height;
int const left = image.find_trim(&top, &width, &height, VImage::option()
int left, top, width, height;
left = image.find_trim(&top, &width, &height, VImage::option()
->set("background", background(0, 0))
->set("threshold", threshold));
if (width == 0 || height == 0) {
throw VError("Unexpected error while trimming. Try to lower the tolerance");
if (HasAlpha(image)) {
// Search alpha channel
VImage alpha = image[image.bands() - 1];
VImage backgroundAlpha = alpha.extract_area(0, 0, 1, 1);
left = alpha.find_trim(&top, &width, &height, VImage::option()
->set("background", backgroundAlpha(0, 0))
->set("threshold", threshold));
}
if (width == 0 || height == 0) {
throw VError("Unexpected error while trimming. Try to lower the tolerance");
}
}
return image.extract_area(left, top, width, height);
}