hpvca 0.1.7

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.
 */

use crate::MAX_DIM;
use std::fmt;

#[derive(Debug)]
pub enum EncodeError {
    InvalidDimensions { width: u32, height: u32 },
    InvalidInput,
    DctError(String),
    BitstreamError(String),
    IsobmffError(String),
    Io(std::io::Error),
    DimensionTooLarge { width: usize, height: usize },
}

impl fmt::Display for EncodeError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            EncodeError::InvalidDimensions { width, height } => {
                write!(f, "Invalid image dimensions: {width}x{height}")
            }
            EncodeError::InvalidInput => write!(
                f,
                "Invalid input: plane sizes or parameters are inconsistent"
            ),
            EncodeError::DctError(msg) => write!(f, "DCT block error: {msg}"),
            EncodeError::BitstreamError(msg) => write!(f, "Bitstream write error: {msg}"),
            EncodeError::IsobmffError(msg) => write!(f, "ISOBMFF error: {msg}"),
            EncodeError::Io(e) => write!(f, "IO error: {e}"),
            Self::DimensionTooLarge { width, height } => write!(
                f,
                "image dimensions {width}×{height} exceed the maximum ({})",
                MAX_DIM
            ),
        }
    }
}

impl std::error::Error for EncodeError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            EncodeError::Io(e) => Some(e),
            _ => None,
        }
    }
}

impl From<std::io::Error> for EncodeError {
    fn from(e: std::io::Error) -> Self {
        EncodeError::Io(e)
    }
}