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extern crate tiff;
use std::io::{self, Cursor, Read, Write, Seek};
use std::marker::PhantomData;
use std::mem;
use color::ColorType;
use image::{ImageDecoder, ImageResult, ImageError};
use utils::vec_u16_into_u8;
pub struct TIFFDecoder<R>
where R: Read + Seek
{
dimensions: (u32, u32),
colortype: ColorType,
inner: tiff::decoder::Decoder<R>,
}
impl<R> TIFFDecoder<R>
where R: Read + Seek
{
pub fn new(r: R) -> Result<TIFFDecoder<R>, ImageError> {
let mut inner = tiff::decoder::Decoder::new(r)?;
let dimensions = inner.dimensions()?;
let colortype = inner.colortype()?.into();
Ok(TIFFDecoder {
dimensions,
colortype,
inner,
})
}
}
impl From<tiff::TiffError> for ImageError {
fn from(err: tiff::TiffError) -> ImageError {
match err {
tiff::TiffError::IoError(err) => ImageError::IoError(err),
tiff::TiffError::FormatError(desc) => ImageError::FormatError(desc.to_string()),
tiff::TiffError::UnsupportedError(desc) => ImageError::UnsupportedError(desc.to_string()),
tiff::TiffError::LimitsExceeded => ImageError::InsufficientMemory,
}
}
}
impl From<tiff::ColorType> for ColorType {
fn from(ct: tiff::ColorType) -> ColorType {
match ct {
tiff::ColorType::Gray(depth) => ColorType::Gray(depth),
tiff::ColorType::RGB(depth) => ColorType::RGB(depth),
tiff::ColorType::Palette(depth) => ColorType::Palette(depth),
tiff::ColorType::GrayA(depth) => ColorType::GrayA(depth),
tiff::ColorType::RGBA(depth) => ColorType::RGBA(depth),
tiff::ColorType::CMYK(_) => unimplemented!()
}
}
}
pub struct TiffReader<R>(Cursor<Vec<u8>>, PhantomData<R>);
impl<R> Read for TiffReader<R> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.0.read(buf)
}
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
if self.0.position() == 0 && buf.is_empty() {
mem::swap(buf, self.0.get_mut());
Ok(buf.len())
} else {
self.0.read_to_end(buf)
}
}
}
impl<'a, R: 'a + Read + Seek> ImageDecoder<'a> for TIFFDecoder<R> {
type Reader = TiffReader<R>;
fn dimensions(&self) -> (u64, u64) {
(u64::from(self.dimensions.0), u64::from(self.dimensions.1))
}
fn colortype(&self) -> ColorType {
self.colortype
}
fn into_reader(self) -> ImageResult<Self::Reader> {
Ok(TiffReader(Cursor::new(self.read_image()?), PhantomData))
}
fn read_image(mut self) -> ImageResult<Vec<u8>> {
match self.inner.read_image()? {
tiff::decoder::DecodingResult::U8(v) => Ok(v),
tiff::decoder::DecodingResult::U16(v) => Ok(vec_u16_into_u8(v)),
}
}
}
pub struct TiffEncoder<W> {
w: W,
}
impl<W: Write + Seek> TiffEncoder<W> {
pub fn new(w: W) -> TiffEncoder<W> {
TiffEncoder { w }
}
pub fn encode(self, data: &[u8], width: u32, height: u32, color: ColorType) -> ImageResult<()> {
let mut encoder = tiff::encoder::TiffEncoder::new(self.w)?;
match color {
ColorType::Gray(8) => encoder.write_image::<tiff::encoder::colortype::Gray8>(width, height, data)?,
ColorType::RGB(8) => encoder.write_image::<tiff::encoder::colortype::RGB8>(width, height, data)?,
ColorType::RGBA(8) => encoder.write_image::<tiff::encoder::colortype::RGBA8>(width, height, data)?,
_ => return Err(ImageError::UnsupportedColor(color))
}
Ok(())
}
}