kongduino / xojo_qoi_decoder

Xojo wrapper around the reference C implementation of the Quite OK Image Format.

Xojo_QOI_Decoder

This is a Xojo wrapper around the reference C implementation of the Quite OK Image Format. Using the qoiconv.c I built a dylib that also gives it PNG conversion capabilities. It is included here, but you can also compile your own. It requires the stb image library. On Mac OS X you can compile it with:

gcc -g -c qoiconv.c -std=c99 -O3 -o qoiconv.o -I../stb/
gcc -dynamiclib -flat_namespace qoiconv.o -o qoi.dylib     

INSTALLATION

You need to copy qoi.dylib to /usr/local/lib – that's where the app expects it to reside:

cp qoi.dylib /usr/local/lib/

When first opening the source code and compiling it, Xojo might complain it can't find the .qoi files. Delete the links in the sidebar, and drag'n'drop the .qoi files from the Finder to the sidebar again.

This sample app implements decode(mb As MemoryBlock) and decodeFile(fp As String). The app itself cycles between 5 .qoi images, displaying the time it took to decode them, and convert them to a Xojo Picture object.

The newest version adds a higher-definition image, and saves the .qoi files as PNG in the /tmp/ directory.

> ls -al /tmp/*.png
-rw-r--r--  1 dda  wheel  2330306 Jan  1 14:45 /tmp/PakOu.png
-rw-r--r--  1 dda  wheel   349827 Jan  1 14:45 /tmp/dice.png
-rw-r--r--  1 dda  wheel   824064 Jan  1 14:45 /tmp/kodim23.png
-rw-r--r--  1 dda  wheel    20210 Jan  1 14:44 /tmp/qoi_logo.png
-rw-r--r--  1 dda  wheel   195553 Jan  1 14:45 /tmp/screen1.png
-rw-r--r--  1 dda  wheel    18371 Jan  1 14:45 /tmp/testcard_rgba.png