libpng

[pifactorial]

I wrote this message to hellcatv:

I can't figure out how to implement libpng in C++. The official libpng documentation is a little lax (IMO).
It looks to me like my source will fit very nicely with the png format, running much faster and using much less memory (and, of course, producing smaller images). I was wondering if you could just give me a quick tutorial in:

• Reading images
• Using image data
• Writing images

using libpng? I assume you have some experience with it...

Thanks,
PiFactorial

I thought maybe that this should be a forum topic, instead of just a 1-1 thing?

[ace123]

This is open source software. The code for png reading is in the CVS repository:
vsimage.cpp

[pifactorial]

I love you! Thanks!

EDIT: Even better, I could just use VSImage's instead of going to the trouble of reading/writing myself. Man I'm lazy!

[ace123]

I also have a image rotating program that I know reads and writes BMP, Jpeg and PNG files. I wrote it as a test program, so it is not friendly.

I am attaching a tar.gz file.

compile with
g++ -o image_rotate image_rotate.cpp texture.cpp -lpng -ljpeg

The argument list is:
./image_rotate -<proc> imagefile1 imagefile2 ...

<proc> is one of:
0
90
180
270
flipv
fliph
flip90
flip270