25 Commits (fb2f8df5cce0580b08da784c94420f55a33b0836)

Author SHA1 Message Date
Jorge Rodriguez fb2f8df5cc Add mitchell filter. ago%!(EXTRA string=11 years)
Jorge Rodriguez 69af963c42 Add catmull rom filter. Also, move the debug asserts for values <= 1 to the very end of the process. This will make these bugs a lot harder to find, but because some filter kernels have negative values it's possible for the buffers to have values > 1 up until the point where it's converted back to an int. ago%!(EXTRA string=11 years)
Jorge Rodriguez 12acf87eec When downsampling start the buffer loop at -filter_texel_margin to make sure that all contributors get their taps in at the ring buffer. ago%!(EXTRA string=11 years)
Jorge Rodriguez 155c71fb90 Reorder these loops because I think we get a cache win if we write the entire ring buffer entry at once. ago%!(EXTRA string=11 years)
Jorge Rodriguez 01fb58d6b4 Add a bicubic filter. ago%!(EXTRA string=11 years)
Jorge Rodriguez a95da9ee1d Unroll the multiply-add loops. At the cost of a function pointer dereference we get a whole lot of conditionals eliminated. Should be a solid win once the debug asserts are gone. ago%!(EXTRA string=11 years)
Jorge Rodriguez 7abd4ccf34 Support for filters with larger support. Initial support for edge behavior. ago%!(EXTRA string=11 years)
Jorge Rodriguez 27926e78b8 Make consistent tests for whether we're doing upsampling or downsampling of width and height. Don't request memory for horizontal buffer or encode buffer if we don't need it. ago%!(EXTRA string=11 years)
Jorge Rodriguez 666c025710 Fix non uniform scaling where out_w < in_w && out_h > in_h. ago%!(EXTRA string=11 years)
Jorge Rodriguez 736596ba09 Fix non uniform scaling where out_w > in_w && out_h < in_h. ago%!(EXTRA string=11 years)
Jorge Rodriguez 178e301ea4 Fix upsampling, avoid dereferencing in an inner loop. ago%!(EXTRA string=11 years)
Jorge Rodriguez dbb7480f12 Fix nonuniform downsampling. ago%!(EXTRA string=11 years)
Jorge Rodriguez fa69bc8551 Basic downsampling algorithm works for uniform sampling. ago%!(EXTRA string=11 years)
Jorge Rodriguez 297266b27b Starting to implement downsampling. ago%!(EXTRA string=11 years)
Jorge Rodriguez 7d8faf5727 Remove unused functions. ago%!(EXTRA string=11 years)
Jorge Rodriguez 8ac052ac8a Avoid gaps between box filter kernels. ago%!(EXTRA string=11 years)
Jorge Rodriguez 9e726bb3e4 The vertical resampling pass. Now all elements of the upscale algorithm are in place. ago%!(EXTRA string=11 years)
Jorge Rodriguez 152965f334 Decode enough scanlines into a ring buffer to make sure that we have enough source scanlines to do a vertical sampling. ago%!(EXTRA string=11 years)
Jorge Rodriguez 158effb62a More accurate names. Smaller size for contributors memory, more accurate to what's needed. ago%!(EXTRA string=11 years)
Jorge Rodriguez 55c5f0b3a0 Beginning of a more sophisticated resample algorithm, starting with calculating filter contributions per scan line. ago%!(EXTRA string=11 years)
Jorge Rodriguez 0155bd3ab6 We are going to support SRGB. ago%!(EXTRA string=11 years)
Jorge Rodriguez ba861fa493 Allow specifying a stride. ago%!(EXTRA string=11 years)
Jorge Rodriguez 06b7b00696 It does nothing now but I want to support edge behavior in the future. ago%!(EXTRA string=11 years)
Jorge Rodriguez c27c5b6fbe There's really no point in returning the output buffer. ago%!(EXTRA string=11 years)
Jorge Rodriguez d54e74092e stb_resample initial implementation ago%!(EXTRA string=11 years)