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Write column data into a buffer, and only write
to USB once the buffer is filled past threshould.
This reduces the amount of data frames on the USB bus,
in a 429x336 sample image it was reduced from 1000 frames
to about 100 frames, where the image data is only 20 frames,
while the rest is mainly polling for status reponses.
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Access to ctx is needed for the next patch
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Increase sleep from 50 μs to 5 ms.
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Compiling gives the following error, since the library is specified
before the local objects:
$ make
[…]
cc -lpng16 build/main.o build/ql.o build/loadpng.o -o build/qlprint
/usr/bin/ld: build/loadpng.o: in function `loadpng':
…/src/loadpng.c:30: undefined reference to `png_sig_cmp'
/usr/bin/ld: …/src/loadpng.c:35: undefined reference to `png_create_read_struct'
/usr/bin/ld: …/src/loadpng.c:39: undefined reference to `png_create_info_struct'
/usr/bin/ld: …/src/loadpng.c:43: undefined reference to `png_create_info_struct'
[…]
collect2: error: ld returned 1 exit status
make: *** [Makefile:28: build/qlprint] Error 1
After reordering:
$ make
[…]
cc build/main.o build/ql.o build/loadpng.o -lpng16 -o build/qlprint
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