[ unknown-component-order ]
} case ;
+: normalize-alpha-data ( seq -- byte-array )
+ ! [ normalize-alpha-data ] change-bitmap
+ B{ } like dup
+ byte-array>float-array
+ 4 <sliced-groups>
+ [
+ dup fourth dup 0 = [
+ 2drop
+ ] [
+ [ 3 head-slice ] dip '[ _ / ] change-each
+ ] if
+ ] each ;
+
: handle-alpha-data ( ifd -- ifd )
dup extra-samples find-tag {
- { extra-samples-associated-alpha-data [
- [
- B{ } like dup
- byte-array>float-array
- 4 <sliced-groups>
- [
- dup fourth dup 0 = [
- 2drop
- ] [
- [ 3 head-slice ] dip '[ _ / ] change-each
- ] if
- ] each
- ] change-bitmap
- ] }
- { extra-samples-unspecified-alpha-data [
- ] }
- { extra-samples-unassociated-alpha-data [
- ] }
+ { extra-samples-associated-alpha-data [ ] }
+ { extra-samples-unspecified-alpha-data [ ] }
+ { extra-samples-unassociated-alpha-data [ ] }
[ bad-extra-samples ]
} case ;