Fix null return from PngDescriptor.getBackgroundColorDescription() #325
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Problem
PngDescriptor.getBackgroundColorDescription()
always returns null even ifTAG_BACKGROUND_COLOR
has some value. This is because the code checks theTAG_COLOR_TYPE
value, but it exists in the different directory (PNG-IHDR).Solution
Return the description based on the length of the byte array. I also added a few tests for
PngDescriptor
.