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extern crate tiff;
use std::convert::TryFrom;
use std::io::{self, Cursor, Read, Write, Seek};
use std::marker::PhantomData;
use std::mem;
use byteorder::{NativeEndian, ByteOrder};
use color::{ColorType, ExtendedColorType};
use image::{ImageDecoder, ImageResult, ImageError};
use utils::vec_u16_into_u8;
pub struct TiffDecoder<R>
where R: Read + Seek
{
dimensions: (u32, u32),
color_type: 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).map_err(ImageError::from_tiff)?;
let dimensions = inner.dimensions().map_err(ImageError::from_tiff)?;
let color_type = match inner.colortype().map_err(ImageError::from_tiff)? {
tiff::ColorType::Gray(8) => ColorType::L8,
tiff::ColorType::Gray(16) => ColorType::L16,
tiff::ColorType::GrayA(8) => ColorType::La8,
tiff::ColorType::GrayA(16) => ColorType::La16,
tiff::ColorType::RGB(8) => ColorType::Rgb8,
tiff::ColorType::RGB(16) => ColorType::Rgb16,
tiff::ColorType::RGBA(8) => ColorType::Rgba8,
tiff::ColorType::RGBA(16) => ColorType::Rgba16,
tiff::ColorType::Palette(n) | tiff::ColorType::Gray(n) =>
return Err(ImageError::UnsupportedColor(ExtendedColorType::Unknown(n))),
tiff::ColorType::GrayA(n) =>
return Err(ImageError::UnsupportedColor(ExtendedColorType::Unknown(n*2))),
tiff::ColorType::RGB(n) =>
return Err(ImageError::UnsupportedColor(ExtendedColorType::Unknown(n*3))),
tiff::ColorType::RGBA(n) | tiff::ColorType::CMYK(n) =>
return Err(ImageError::UnsupportedColor(ExtendedColorType::Unknown(n*4))),
};
Ok(TiffDecoder {
dimensions,
color_type,
inner,
})
}
}
impl ImageError {
fn from_tiff(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,
}
}
}
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) -> (u32, u32) {
self.dimensions
}
fn color_type(&self) -> ColorType {
self.color_type
}
fn into_reader(mut self) -> ImageResult<Self::Reader> {
let buf = match self.inner.read_image().map_err(ImageError::from_tiff)? {
tiff::decoder::DecodingResult::U8(v) => v,
tiff::decoder::DecodingResult::U16(v) => vec_u16_into_u8(v),
};
Ok(TiffReader(Cursor::new(buf), PhantomData))
}
fn read_image(mut self, buf: &mut [u8]) -> ImageResult<()> {
assert_eq!(u64::try_from(buf.len()), Ok(self.total_bytes()));
match self.inner.read_image().map_err(ImageError::from_tiff)? {
tiff::decoder::DecodingResult::U8(v) => {
buf.copy_from_slice(&v);
}
tiff::decoder::DecodingResult::U16(v) => {
NativeEndian::write_u16_into(&v, buf);
}
}
Ok(())
}
}
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).map_err(ImageError::from_tiff)?;
match color {
ColorType::L8 => encoder.write_image::<tiff::encoder::colortype::Gray8>(width, height, data),
ColorType::Rgb8 => encoder.write_image::<tiff::encoder::colortype::RGB8>(width, height, data),
ColorType::Rgba8 => encoder.write_image::<tiff::encoder::colortype::RGBA8>(width, height, data),
_ => return Err(ImageError::UnsupportedColor(color.into()))
}.map_err(ImageError::from_tiff)?;
Ok(())
}
}