quickraw 0.1.6

A pure rust library to handle camera raw files
Documentation 
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use super::{super::bit_pump::*, super::DecodingError, *};

pub(in super::super) fn decode_ljpeg_2components(
    ljpeg: &LjpegDecompressor,
    out: &mut [u16],
    x: usize,
    stripwidth: usize,
    width: usize,
    height: usize,
) -> Result<(), DecodingError> {
    if ljpeg.sof.width * 2 < width || ljpeg.sof.height < height {
        return Err(DecodingError::LJpegDecompressingError(
            ljpeg.sof.width * 2,
            ljpeg.sof.height,
            width,
            height,
        ));
    }
    let htable1 = &ljpeg.dhts[ljpeg.sof.components[0].dc_tbl_num];
    let htable2 = &ljpeg.dhts[ljpeg.sof.components[1].dc_tbl_num];
    let mut pump = BitPumpJPEG::new(ljpeg.buffer);

    let base_prediction = 1 << (ljpeg.sof.precision - ljpeg.point_transform - 1);
    out[x] = (base_prediction + htable1.huff_decode(&mut pump)) as u16;
    out[x + 1] = (base_prediction + htable2.huff_decode(&mut pump)) as u16;
    let skip_x = ljpeg.sof.width - width / 2;

    for row in 0..height {
        let startcol = if row == 0 { x + 2 } else { x };
        for col in (startcol..(width + x)).step_by(2) {
            let (p1, p2) = if col == x {
                // At start of line predictor starts with start of previous line
                (
                    out[(row - 1) * stripwidth + x],
                    out[(row - 1) * stripwidth + 1 + x],
                )
            } else {
                // All other cases use the two previous pixels in the same line
                (
                    out[row * stripwidth + col - 2],
                    out[row * stripwidth + col - 1],
                )
            };

            let diff1 = htable1.huff_decode(&mut pump);
            let diff2 = htable2.huff_decode(&mut pump);
            out[row * stripwidth + col] = ((p1 as i32) + diff1) as u16;
            out[row * stripwidth + col + 1] = ((p2 as i32) + diff2) as u16;
        }
        // Skip extra encoded differences if the ljpeg frame is wider than the output
        for _ in 0..skip_x {
            htable1.huff_decode(&mut pump);
            htable2.huff_decode(&mut pump);
        }
    }

    Ok(())
}

pub(in super::super) fn decode_ljpeg_3components(
    ljpeg: &LjpegDecompressor,
    out: &mut [u16],
    x: usize,
    stripwidth: usize,
    width: usize,
    height: usize,
) -> Result<(), DecodingError> {
    if ljpeg.sof.width * 3 < width || ljpeg.sof.height < height {
        return Err(DecodingError::LJpegDecompressingError(
            ljpeg.sof.width * 3,
            ljpeg.sof.height,
            width,
            height,
        ));
    }

    let htable1 = &ljpeg.dhts[ljpeg.sof.components[0].dc_tbl_num];
    let htable2 = &ljpeg.dhts[ljpeg.sof.components[1].dc_tbl_num];
    let htable3 = &ljpeg.dhts[ljpeg.sof.components[2].dc_tbl_num];
    let mut pump = BitPumpJPEG::new(ljpeg.buffer);

    let base_prediction = 1 << (ljpeg.sof.precision - ljpeg.point_transform - 1);
    out[x] = (base_prediction + htable1.huff_decode(&mut pump)) as u16;
    out[x + 1] = (base_prediction + htable2.huff_decode(&mut pump)) as u16;
    out[x + 2] = (base_prediction + htable3.huff_decode(&mut pump)) as u16;
    let skip_x = ljpeg.sof.width - width / 3;

    for row in 0..height {
        let startcol = if row == 0 { x + 3 } else { x };
        for col in (startcol..(width + x)).step_by(3) {
            let pos = if col == x {
                // At start of line predictor starts with start of previous line
                (row - 1) * stripwidth + x
            } else {
                // All other cases use the two previous pixels in the same line
                row * stripwidth + col - 3
            };
            let (p1, p2, p3) = (out[pos], out[pos + 1], out[pos + 2]);

            let diff1 = htable1.huff_decode(&mut pump);
            let diff2 = htable2.huff_decode(&mut pump);
            let diff3 = htable3.huff_decode(&mut pump);
            out[row * stripwidth + col] = ((p1 as i32) + diff1) as u16;
            out[row * stripwidth + col + 1] = ((p2 as i32) + diff2) as u16;
            out[row * stripwidth + col + 2] = ((p3 as i32) + diff3) as u16;
        }
        // Skip extra encoded differences if the ljpeg frame is wider than the output
        for _ in 0..skip_x {
            htable1.huff_decode(&mut pump);
            htable2.huff_decode(&mut pump);
            htable3.huff_decode(&mut pump);
        }
    }

    Ok(())
}

pub(in super::super) fn decode_ljpeg_4components(
    ljpeg: &LjpegDecompressor,
    out: &mut [u16],
    width: usize,
    height: usize,
) -> Result<(), DecodingError> {
    if ljpeg.sof.width * 4 < width || ljpeg.sof.height < height {
        return Err(DecodingError::LJpegDecompressingError(
            ljpeg.sof.width * 4,
            ljpeg.sof.height,
            width,
            height,
        ));
    }
    let htable1 = &ljpeg.dhts[ljpeg.sof.components[0].dc_tbl_num];
    let htable2 = &ljpeg.dhts[ljpeg.sof.components[1].dc_tbl_num];
    let htable3 = &ljpeg.dhts[ljpeg.sof.components[2].dc_tbl_num];
    let htable4 = &ljpeg.dhts[ljpeg.sof.components[3].dc_tbl_num];
    let mut pump = BitPumpJPEG::new(ljpeg.buffer);

    let base_prediction = 1 << (ljpeg.sof.precision - ljpeg.point_transform - 1);
    out[0] = (base_prediction + htable1.huff_decode(&mut pump)) as u16;
    out[1] = (base_prediction + htable2.huff_decode(&mut pump)) as u16;
    out[2] = (base_prediction + htable3.huff_decode(&mut pump)) as u16;
    out[3] = (base_prediction + htable4.huff_decode(&mut pump)) as u16;
    let skip_x = ljpeg.sof.width - width / 4;

    for row in 0..height {
        let startcol = if row == 0 { 4 } else { 0 };
        for col in (startcol..width).step_by(4) {
            let pos = if col == 0 {
                // At start of line predictor starts with start of previous line
                (row - 1) * width
            } else {
                // All other cases use the two previous pixels in the same line
                row * width + col - 4
            };

            let (p1, p2, p3, p4) = (out[pos], out[pos + 1], out[pos + 2], out[pos + 3]);

            let diff1 = htable1.huff_decode(&mut pump);
            let diff2 = htable2.huff_decode(&mut pump);
            let diff3 = htable3.huff_decode(&mut pump);
            let diff4 = htable4.huff_decode(&mut pump);
            out[row * width + col] = ((p1 as i32) + diff1) as u16;
            out[row * width + col + 1] = ((p2 as i32) + diff2) as u16;
            out[row * width + col + 2] = ((p3 as i32) + diff3) as u16;
            out[row * width + col + 3] = ((p4 as i32) + diff4) as u16;
        }
        // Skip extra encoded differences if the ljpeg frame is wider than the output
        for _ in 0..skip_x {
            htable1.huff_decode(&mut pump);
            htable2.huff_decode(&mut pump);
            htable3.huff_decode(&mut pump);
            htable4.huff_decode(&mut pump);
        }
    }

    Ok(())
}

fn set_yuv_420(
    out: &mut [u16],
    row: usize,
    col: usize,
    width: usize,
    (y1, y2, y3, y4, cb, cr): (i32, i32, i32, i32, i32, i32),
) {
    let pix1 = row * width + col;
    let pix2 = pix1 + 3;
    let pix3 = (row + 1) * width + col;
    let pix4 = pix3 + 3;

    out[pix1] = y1 as u16;
    out[pix1 + 1] = cb as u16;
    out[pix1 + 2] = cr as u16;
    out[pix2] = y2 as u16;
    out[pix2 + 1] = cb as u16;
    out[pix2 + 2] = cr as u16;
    out[pix3] = y3 as u16;
    out[pix3 + 1] = cb as u16;
    out[pix3 + 2] = cr as u16;
    out[pix4] = y4 as u16;
    out[pix4 + 1] = cb as u16;
    out[pix4 + 2] = cr as u16;
}

pub(in super::super) fn decode_ljpeg_420(
    ljpeg: &LjpegDecompressor,
    out: &mut [u16],
    width: usize,
    height: usize,
) -> Result<(), DecodingError> {
    if ljpeg.sof.width * 3 != width || ljpeg.sof.height != height {
        return Err(DecodingError::LJpegDecompressingError(
            ljpeg.sof.width * 3,
            ljpeg.sof.height,
            width,
            height,
        ));
    }

    let htable1 = &ljpeg.dhts[ljpeg.sof.components[0].dc_tbl_num];
    let htable2 = &ljpeg.dhts[ljpeg.sof.components[1].dc_tbl_num];
    let htable3 = &ljpeg.dhts[ljpeg.sof.components[2].dc_tbl_num];
    let mut pump = BitPumpJPEG::new(ljpeg.buffer);

    let base_prediction = 1 << (ljpeg.sof.precision - ljpeg.point_transform - 1);
    let y1 = base_prediction + htable1.huff_decode(&mut pump);
    let y2 = y1 + htable1.huff_decode(&mut pump);
    let y3 = y2 + htable1.huff_decode(&mut pump);
    let y4 = y3 + htable1.huff_decode(&mut pump);
    let cb = base_prediction + htable2.huff_decode(&mut pump);
    let cr = base_prediction + htable3.huff_decode(&mut pump);
    set_yuv_420(out, 0, 0, width, (y1, y2, y3, y4, cb, cr));

    for row in (0..height).step_by(2) {
        let startcol = if row == 0 { 6 } else { 0 };
        for col in (startcol..width).step_by(6) {
            let pos = if col == 0 {
                // At start of line predictor starts with first pixel of start of previous line
                (row - 2) * width
            } else {
                // All other cases use the last pixel in the same two lines
                (row + 1) * width + col - 3
            };
            let (py, pcb, pcr) = (out[pos], out[pos + 1], out[pos + 2]);

            let y1 = (py as i32) + htable1.huff_decode(&mut pump);
            let y2 = (y1 as i32) + htable1.huff_decode(&mut pump);
            let y3 = (y2 as i32) + htable1.huff_decode(&mut pump);
            let y4 = (y3 as i32) + htable1.huff_decode(&mut pump);
            let cb = (pcb as i32) + htable2.huff_decode(&mut pump);
            let cr = (pcr as i32) + htable3.huff_decode(&mut pump);
            set_yuv_420(out, row, col, width, (y1, y2, y3, y4, cb, cr));
        }
    }

    Ok(())
}

fn set_yuv_422(
    out: &mut [u16],
    row: usize,
    col: usize,
    width: usize,
    (y1, y2, cb, cr): (i32, i32, i32, i32),
) {
    let pix1 = row * width + col;
    let pix2 = pix1 + 3;

    out[pix1] = y1 as u16;
    out[pix1 + 1] = cb as u16;
    out[pix1 + 2] = cr as u16;
    out[pix2] = y2 as u16;
    out[pix2 + 1] = cb as u16;
    out[pix2 + 2] = cr as u16;
}

pub(in super::super) fn decode_ljpeg_422(
    ljpeg: &LjpegDecompressor,
    out: &mut [u16],
    width: usize,
    height: usize,
) -> Result<(), DecodingError> {
    if ljpeg.sof.width * 3 != width || ljpeg.sof.height != height {
        return Err(DecodingError::LJpegDecompressingError(
            ljpeg.sof.width * 3,
            ljpeg.sof.height,
            width,
            height,
        ));
    }
    let htable1 = &ljpeg.dhts[ljpeg.sof.components[0].dc_tbl_num];
    let htable2 = &ljpeg.dhts[ljpeg.sof.components[1].dc_tbl_num];
    let htable3 = &ljpeg.dhts[ljpeg.sof.components[2].dc_tbl_num];
    let mut pump = BitPumpJPEG::new(ljpeg.buffer);

    let base_prediction = 1 << (ljpeg.sof.precision - ljpeg.point_transform - 1);
    let y1 = base_prediction + htable1.huff_decode(&mut pump);
    let y2 = y1 + htable1.huff_decode(&mut pump);
    let cb = base_prediction + htable2.huff_decode(&mut pump);
    let cr = base_prediction + htable3.huff_decode(&mut pump);
    set_yuv_422(out, 0, 0, width, (y1, y2, cb, cr));

    for row in 0..height {
        let startcol = if row == 0 { 6 } else { 0 };
        for col in (startcol..width).step_by(6) {
            let pos = if col == 0 {
                // At start of line predictor starts with first pixel of start of previous line
                (row - 1) * width
            } else {
                // All other cases use the last pixel in the same two lines
                row * width + col - 3
            };
            let (py, pcb, pcr) = (out[pos], out[pos + 1], out[pos + 2]);

            let y1 = (py as i32) + htable1.huff_decode(&mut pump);
            let y2 = (y1 as i32) + htable1.huff_decode(&mut pump);
            let cb = (pcb as i32) + htable2.huff_decode(&mut pump);
            let cr = (pcr as i32) + htable3.huff_decode(&mut pump);
            set_yuv_422(out, row, col, width, (y1, y2, cb, cr));
        }
    }

    Ok(())
}

pub(in super::super) fn decode_hasselblad(
    ljpeg: &LjpegDecompressor,
    out: &mut [u16],
    width: usize,
) -> Result<(), DecodingError> {
    // Pixels are packed two at a time, not like LJPEG:
    // [p1_length_as_huffman][p2_length_as_huffman][p0_diff_with_length][p1_diff_with_length]|NEXT PIXELS
    let mut pump = BitPumpMSB32::new(ljpeg.buffer);
    let htable = &ljpeg.dhts[ljpeg.sof.components[0].dc_tbl_num];

    for line in out.chunks_exact_mut(width) {
        let mut p1: i32 = 0x8000;
        let mut p2: i32 = 0x8000;
        for o in line.chunks_exact_mut(2) {
            let len1 = htable.huff_len(&mut pump);
            let len2 = htable.huff_len(&mut pump);
            p1 += htable.huff_diff(&mut pump, len1);
            p2 += htable.huff_diff(&mut pump, len2);
            o[0] = p1 as u16;
            o[1] = p2 as u16;
        }
    }

    Ok(())
}

// pub(in super::super) fn decode_leaf_strip(
//     src: &[u8],
//     out: &mut [u16],
//     width: usize,
//     height: usize,
//     htable1: &HuffTable,
//     htable2: &HuffTable,
//     bpred: i32,
// ) -> Result<()> {
//     let mut pump = BitPumpJPEG::new(src);
//     out[0] = (bpred + htable1.huff_decode(&mut pump)) as u16;
//     out[1] = (bpred + htable2.huff_decode(&mut pump)) as u16;
//     for row in 0..height {
//         let startcol = if row == 0 { 2 } else { 0 };
//         for col in (startcol..width).step_by(2) {
//             let pos = if col == 0 {
//                 // At start of line predictor starts with start of previous line
//                 (row - 1) * width
//             } else {
//                 // All other cases use the two previous pixels in the same line
//                 row * width + col - 2
//             };
//             let (p1, p2) = (out[pos], out[pos + 1]);

//             let diff1 = htable1.huff_decode(&mut pump);
//             let diff2 = htable2.huff_decode(&mut pump);
//             out[row * width + col] = ((p1 as i32) + diff1) as u16;
//             out[row * width + col + 1] = ((p2 as i32) + diff2) as u16;
//         }
//     }

//     Ok(())
// }