Add option to invert rows in spng_encode_image
#271
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This merge request is to share back something I implemented in a downstream copy of the project. No pressure to accept it; just sharing in case it's useful.
Previously,
spng_encode_imagewould always interpret theimgdata pointer as pointing to image data in top-to-bottom order, despite some image data APIs storing image data in bottom-to-top order (most notably, OpenGL functions likeglReadPixels).This merge request adds a flag,
SPNG_ENCODE_INVERT_ROWSto allowspng_encode_imageto interpret the given image data pointer as containing rows in bottom-to-top order, instead of top-to-bottom. This allows saving PNG images directly fromglReadPixelscalls when using OpenGL, without an additional copy to reverse the row data.