Sophie Herold f80ec7db56 decoder: Use image-rs, libheif-rs, librsvg

This adds proper support for a lot of image formats including SVGs.
It will be the basis for many features to come. The technical core
is an asynchronous renderer that can arrange textures in smaller tiles
which might be generated on demand.

Closes #34, #40, #41, #49

Basis for fixing the following issues #7, #27, #36, #43, #68, #71

2023-03-04 21:48:51 -05:00

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Loupe

A simple image viewer application written with GTK4 and Rust.

Installing

The latest version from the main branch is available from the build artifacts.

Download bundle for:

x86_64 (Average desktop or laptop PC)
aarch64 (Average phone, tablet, or Apple Silicon devices)

Bundles will not be automatically updated after installation.

Supported Formats

Format	ICC	CICP	EXIF	XMP	Animation	Library
JPEG	✔	—	✔	✘	—	image-rs
PNG	✔	✘	✔	✘	✘	image-rs
GIF	✘ *	—	—	✘	✘	image-rs
WEBP	—	—	✔	✘	✘	image-rs
AVIF	✔	✔	✔	✘	✘	libheif-rs + libheif (C++)
HEIC	✔	✔	✔	✘	✘	libheif-rs + libheif (C++) **
TIFF	✘	—	✔	✘	—	image-rs
SVG	✘	—	—	✘ *	—	librsvg
BMP	✘	—	—	—	—	image-rs
ICO	—	—	—	—	—	image-rs
PNM	—	—	—	—	—	image-rs
DDS	—	—	—	—	—	image-rs
TGA	—	—	—	—	—	image-rs
OpenEXR	—	—	—	—	—	image-rs
farbfeld	—	—	—	—	—	image-rs

Symbol	Meaning
*	Unclear if used in practice, needs research
**	Split into plugin because of licensing issues
✘	Supported by format but not implemented yet
？	Unclear if supported by format, needs research
✔	Supported

Building

GNOME Builder

GNOME Builder is the environment used for developing this application. It can use Flatpak manifests to create a consistent building and running environment cross-distro. Thus, it is highly recommended you use it.

Download GNOME Builder.
In Builder, click the "Clone Repository" button at the bottom, using git@gitlab.gnome.org/Incubator/loupe.git or https://gitlab.gnome.org/Incubator/loupe.git as the URL.
Click the build button at the top once the project is loaded.

Installation

Depending on how you want it installed instructions can differ. If you used GNOME Builder to build it, clicking the bar at the top window will open a submenu with "Export Bundle". This will create a flatpak bundle, which can be installed on any system that supports flatpak.

In order for the Loupe flatpak to be able to read the directory images are installed in, you must install a bundle. Once you have a bundle installed, development builds will work properly.

Contributing

Code Documentation

Conduct

Loupe operates under the GNOME Code Of Conduct. See the full text of the Code Of Conduct here.

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