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// SPDX-License-Identifier: LGPL-3.0-or-later
/*
* libopenraw - thumbnail.rs
*
* Copyright (C) 2022 Hubert Figuière
*
* This library is free software: you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
//! Representation of thumbnails
use crate::bitmap::Bitmap;
use crate::DataType;
#[derive(Debug)]
/// Offset/len representation for `Data`
pub struct DataOffset {
/// Offset in the container
pub offset: u64,
/// Data size
pub len: u64,
}
#[derive(Debug)]
/// Represent data either as offset/len or a buffer.
pub enum Data {
Offset(DataOffset),
Bytes(Vec<u8>),
}
impl Data {
pub fn len(&self) -> usize {
match *self {
Self::Offset(ref offset) => offset.len as usize,
Self::Bytes(ref v) => v.len(),
}
}
}
#[derive(Debug)]
/// Describe a thumbnail to fetch it from the container later
/// as a blob
pub struct ThumbDesc {
/// Thumbnail width
pub width: u32,
/// Thumbnail height
pub height: u32,
/// Type if the data
pub data_type: DataType,
/// The data
pub data: Data,
}
impl ThumbDesc {
pub fn data_size(&self) -> u64 {
match self.data {
Data::Offset(ref offset) => offset.len,
Data::Bytes(ref v) => v.len() as u64,
}
}
}
/// A thumbnail
#[derive(Debug)]
pub struct Thumbnail {
/// Thumbnail width
width: u32,
/// Thumbnail height
height: u32,
/// Bits per component
bpc: u16,
/// Type of the data
data_type: DataType,
data: Vec<u8>,
}
impl Default for Thumbnail {
fn default() -> Thumbnail {
Thumbnail {
width: 0,
height: 0,
bpc: 8,
data_type: DataType::default(),
data: vec![],
}
}
}
impl Thumbnail {
pub(crate) fn new() -> Thumbnail {
Thumbnail::default()
}
/// New thumbnail with data.
pub(crate) fn with_data(
width: u32,
height: u32,
data_type: DataType,
data: Vec<u8>,
) -> Thumbnail {
Thumbnail {
width,
height,
bpc: 8,
data_type,
data,
}
}
}
impl Bitmap for Thumbnail {
fn data_type(&self) -> DataType {
self.data_type
}
fn data_size(&self) -> usize {
self.data.len()
}
fn width(&self) -> u32 {
self.width
}
fn height(&self) -> u32 {
self.height
}
fn bpc(&self) -> u16 {
self.bpc
}
fn data8(&self) -> Option<&[u8]> {
Some(&self.data)
}
}
|
