jaragunde commented on code in PR #990:
URL: https://github.com/apache/poi/pull/990#discussion_r2676090103
##########
poi-ooxml/src/main/java/org/apache/poi/xslf/usermodel/XSLFPictureShape.java:
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@@ -225,6 +225,10 @@ public Insets getClipping(){
POIXMLUnits.parsePercent(r.xgetR()));
}
+ public int getAlpha() {
+ return getBlip().sizeOfAlphaModFixArray() > 0 ?
POIXMLUnits.parsePercent(getBlip().getAlphaModFixArray(0).xgetAmt()) : 100000;
Review Comment:
Good question, I first found this in the code that applies alpha to bitmap
fill in shapes:
https://github.com/apache/poi/blob/fd66689944132934845f177bdd52b17822f600d1/poi/src/main/java/org/apache/poi/sl/draw/DrawPaint.java#L279
It obtains the alpha value from TexturePaint which expresses it in "100k
percentage". I basically copied the getAlpha implementation from
XSLFTexturePaint:
https://github.com/apache/poi/blob/6670c48c305fca2aa30c4bdd01763c696f8f698e/poi-ooxml/src/main/java/org/apache/poi/xslf/usermodel/XSLFTexturePaint.java#L105
Opening up an OOXML file, alpha information is stored like this:
`<a:alphaModFix amt="80000"/>`. This example is 80%. I guess it all comes down
to "we do what OOXML does".
I've just taken a look at the standard, and I understood it's also possible
to express it like a percentage string, like "80%" but I haven't found
documents using it. I will forge one and come back.
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