Hi, all! I'm trying to achieve the following when reading an image:
1. Read the image into a non-interleaved buffer (so the order of the buffer values looks like RRRGGGBBB instead of RGBRGBRGB) 2. Flip the images vertically upon reading I was able to attain a non-interleaved buffer following the read_image example in the documentation (https://openimageio.readthedocs.io/en/latest/imageinput.html#reading-channels-to-separate-buffers), but in order to also flip the image vertically, I need to provide a negative y stride. However, because the stride represents the distance between pixel rows in the buffer itself, it doesn't seem possible to specify a stride value that makes sense for a non-interleaved buffer. Is there a way to achieve both? One approach I tried uses read_scanlines in a nested loop to iterate over each channel in the image in reverse scanline order: for (int channel = 0; channel < numChannels; ++channel) { for (int y = 0; y < height; ++y) { image->read_scanlines(subimage, miplevel, height - y - 1, height - y, 0, channel, channel + 1, OIIO::TypeDesc::FLOAT, &pixelBuffer[width * height * channel + (width * y)]); } } Although this works, it is too slow. Is there a more efficient approach? Thanks, Jesse
_______________________________________________ Oiio-dev mailing list Oiio-dev@lists.openimageio.org http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
