Module cosmic::iced_widget::renderer::graphics::image::image_rs::codecs

Encoding and decoding for various image file formats.

Supported formats

Format	Decoding	Encoding
AVIF	Only 8-bit	Lossy
BMP	Yes	Rgb8, Rgba8, Gray8, GrayA8
DDS	DXT1, DXT3, DXT5	No
Farbfeld	Yes	Yes
GIF	Yes	Yes
HDR	Yes	Yes
ICO	Yes	Yes
JPEG	Baseline and progressive	Baseline JPEG
OpenEXR	Rgb32F, Rgba32F (no dwa compression)	Rgb32F, Rgba32F (no dwa compression)
PNG	All supported color types	Same as decoding
PNM	PBM, PGM, PPM, standard PAM	Yes
QOI	Yes	Yes
TGA	Yes	Rgb8, Rgba8, Bgr8, Bgra8, Gray8, GrayA8
TIFF	Baseline(no fax support) + LZW + PackBits	Rgb8, Rgba8, Gray8
WebP	Yes	Rgb8, Rgba8

A note on format specific features

One of the main goals of image is stability, in runtime but also for programmers. This ensures that performance as well as safety fixes reach a majority of its user base with little effort. Re-exporting all details of its dependencies would run counter to this goal as it linked all major version bumps between them and image. As such, we are wary of exposing too many details, or configuration options, that are not shared between different image formats.

Nevertheless, the advantage of precise control is hard to ignore. We will thus consider wrappers, not direct re-exports, in either of the following cases:

1. A standard specifies that configuration x is required for decoders/encoders and there exists an essentially canonical way to control it.
2. At least two different implementations agree on some (sub-)set of features in practice.
3. A technical argument including measurements of the performance, space benefits, or otherwise objectively quantified benefits can be made, and the added interface is unlikely to require breaking changes.

Features that fulfill two or more criteria are preferred.

Re-exports of dependencies that reach version 1 will be discussed when it happens.

Modules

• bmp
  Decoding and Encoding of BMP Images
• dds
  Decoding of DDS images
• dxtDeprecated
  Decoding of DXT (S3TC) compression
• farbfeld
  Decoding of farbfeld images
• gif
  Decoding of GIF Images
• hdr
  Decoding of Radiance HDR Images
• ico
  Decoding and Encoding of ICO files
• jpeg
  Decoding and Encoding of JPEG Images
• openexr
  Decoding of OpenEXR (.exr) Images
• png
  Decoding and Encoding of PNG Images
• pnm
  Decoding of netpbm image formats (pbm, pgm, ppm and pam).
• qoi
  Decoding and encoding of QOI images
• tga
  Decoding of TGA Images
• tiff
  Decoding and Encoding of TIFF Images
• webp
  Decoding and Encoding of WebP Images