hpvca 0.1.2

HEVC/HEIC tiny image encoder
Documentation 
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/*
 * // Copyright (c) Radzivon Bartoshyk 6/2026. All rights reserved.
 * //
 * // Redistribution and use in source and binary forms, with or without modification,
 * // are permitted provided that the following conditions are met:
 * //
 * // 1.  Redistributions of source code must retain the above copyright notice, this
 * // list of conditions and the following disclaimer.
 * //
 * // 2.  Redistributions in binary form must reproduce the above copyright notice,
 * // this list of conditions and the following disclaimer in the documentation
 * // and/or other materials provided with the distribution.
 * //
 * // 3.  Neither the name of the copyright holder nor the names of its
 * // contributors may be used to endorse or promote products derived from
 * // this software without specific prior written permission.
 * //
 * // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#[rustfmt::skip]
pub(crate) static ZIGZAG: [(usize, usize); 64] = [
    (0,0),(1,0),(0,1),(2,0),(1,1),(0,2),(3,0),(2,1),
    (1,2),(0,3),(3,1),(2,2),(1,3),(3,2),(2,3),(3,3),
    (4,0),(5,0),(4,1),(6,0),(5,1),(4,2),(7,0),(6,1),
    (5,2),(4,3),(7,1),(6,2),(5,3),(7,2),(6,3),(7,3),
    (0,4),(1,4),(0,5),(2,4),(1,5),(0,6),(3,4),(2,5),
    (1,6),(0,7),(3,5),(2,6),(1,7),(3,6),(2,7),(3,7),
    (4,4),(5,4),(4,5),(6,4),(5,5),(4,6),(7,4),(6,5),
    (5,6),(4,7),(7,5),(6,6),(5,7),(7,6),(6,7),(7,7),
];

/// HEVC up-right diagonal scan for a single 4×4 block, `(row, col)`.
#[rustfmt::skip]
pub(crate) static DIAG_SCAN_4X4: [(usize, usize); 16] = [
    (0,0),(1,0),(0,1),(2,0),(1,1),(0,2),(3,0),(2,1),
    (1,2),(0,3),(3,1),(2,2),(1,3),(3,2),(2,3),(3,3),
];