use std::fs::File;
use std::io::{BufRead, BufWriter, Seek};
use std::path::Path;
use crate::{codecs::*, ExtendedColorType, ImageReader};
use crate::dynimage::DynamicImage;
use crate::error::{ImageError, ImageFormatHint, ImageResult};
use crate::error::{UnsupportedError, UnsupportedErrorKind};
use crate::image::ImageFormat;
#[allow(unused_imports)] use crate::image::{ImageDecoder, ImageEncoder};
pub fn load<R: BufRead + Seek>(r: R, format: ImageFormat) -> ImageResult<DynamicImage> {
let mut reader = ImageReader::new(r);
reader.set_format(format);
reader.decode()
}
#[allow(unused_variables)]
pub(crate) fn save_buffer_impl(
path: &Path,
buf: &[u8],
width: u32,
height: u32,
color: ExtendedColorType,
) -> ImageResult<()> {
let format = ImageFormat::from_path(path)?;
save_buffer_with_format_impl(path, buf, width, height, color, format)
}
#[allow(unused_variables)]
pub(crate) fn save_buffer_with_format_impl(
path: &Path,
buf: &[u8],
width: u32,
height: u32,
color: ExtendedColorType,
format: ImageFormat,
) -> ImageResult<()> {
let buffered_file_write = &mut BufWriter::new(File::create(path)?); write_buffer_impl(buffered_file_write, buf, width, height, color, format)
}
#[allow(unused_variables)]
pub(crate) fn write_buffer_impl<W: std::io::Write + Seek>(
buffered_write: &mut W,
buf: &[u8],
width: u32,
height: u32,
color: ExtendedColorType,
format: ImageFormat,
) -> ImageResult<()> {
match format {
#[cfg(feature = "png")]
ImageFormat::Png => {
png::PngEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "jpeg")]
ImageFormat::Jpeg => {
jpeg::JpegEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "pnm")]
ImageFormat::Pnm => {
pnm::PnmEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "gif")]
ImageFormat::Gif => gif::GifEncoder::new(buffered_write).encode(buf, width, height, color),
#[cfg(feature = "ico")]
ImageFormat::Ico => {
ico::IcoEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "bmp")]
ImageFormat::Bmp => {
bmp::BmpEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "ff")]
ImageFormat::Farbfeld => {
farbfeld::FarbfeldEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "tga")]
ImageFormat::Tga => {
tga::TgaEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "exr")]
ImageFormat::OpenExr => {
openexr::OpenExrEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "tiff")]
ImageFormat::Tiff => {
tiff::TiffEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "avif")]
ImageFormat::Avif => {
avif::AvifEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "qoi")]
ImageFormat::Qoi => {
qoi::QoiEncoder::new(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "webp")]
ImageFormat::WebP => {
webp::WebPEncoder::new_lossless(buffered_write).write_image(buf, width, height, color)
}
#[cfg(feature = "hdr")]
ImageFormat::Hdr => {
hdr::HdrEncoder::new(buffered_write).write_image(buf, width, height, color)
}
_ => Err(ImageError::Unsupported(
UnsupportedError::from_format_and_kind(
ImageFormatHint::Unknown,
UnsupportedErrorKind::Format(ImageFormatHint::Name(format!("{format:?}"))),
),
)),
}
}
static MAGIC_BYTES: [(&[u8], ImageFormat); 23] = [
(b"\x89PNG\r\n\x1a\n", ImageFormat::Png),
(&[0xff, 0xd8, 0xff], ImageFormat::Jpeg),
(b"GIF89a", ImageFormat::Gif),
(b"GIF87a", ImageFormat::Gif),
(b"RIFF", ImageFormat::WebP), (b"MM\x00*", ImageFormat::Tiff),
(b"II*\x00", ImageFormat::Tiff),
(b"DDS ", ImageFormat::Dds),
(b"BM", ImageFormat::Bmp),
(&[0, 0, 1, 0], ImageFormat::Ico),
(b"#?RADIANCE", ImageFormat::Hdr),
(b"P1", ImageFormat::Pnm),
(b"P2", ImageFormat::Pnm),
(b"P3", ImageFormat::Pnm),
(b"P4", ImageFormat::Pnm),
(b"P5", ImageFormat::Pnm),
(b"P6", ImageFormat::Pnm),
(b"P7", ImageFormat::Pnm),
(b"farbfeld", ImageFormat::Farbfeld),
(b"\0\0\0 ftypavif", ImageFormat::Avif),
(b"\0\0\0\x1cftypavif", ImageFormat::Avif),
(&[0x76, 0x2f, 0x31, 0x01], ImageFormat::OpenExr), (b"qoif", ImageFormat::Qoi),
];
pub fn guess_format(buffer: &[u8]) -> ImageResult<ImageFormat> {
match guess_format_impl(buffer) {
Some(format) => Ok(format),
None => Err(ImageError::Unsupported(ImageFormatHint::Unknown.into())),
}
}
pub(crate) fn guess_format_impl(buffer: &[u8]) -> Option<ImageFormat> {
for &(signature, format) in &MAGIC_BYTES {
if buffer.starts_with(signature) {
return Some(format);
}
}
None
}