A simple solution for encoding common icon file-formats, such as .ico, .icns and favicon.
This crate is mostly a wrapper for other libraries, unifying existing APIs into a single, cohesive interface.
An icon consists of a map between entries and images. An entry is simply the key type of an icon.
IconWriter simply automates the process of re-scaling images, creating entries and combining them into an icon.
Each icon format is associated with a particular key type, which determines how entries are labeled. Each key can only be associated with a single image.
For example, icon formats that only differentiate entries by the dimensions of their associated
images are labeled by positive integers, such as the .ico and .icns file-formats.
On the other hand, icon formats that distinguish their entries by path, such as png sequeces and FreeDesktop icon themes , are labeled by path.
Note that, since the dimensions
of the images contained in an entry are dictated by their associated entries, every key
must be convertible to a positive integers. Therefore, all key types are required to implement
AsRef<u32>.
Pictures are scaled using resampling filters, which are represented by functions that take a source image and a size and return a re-scaled image.
This allows the users of this crate to provide their custom resampling filters. Common resampling
filters are provided in the
resample module.
IconWriter simply automates the process of re-scaling pictures and combining them into an icon.
Pictures are scaled using resampling filters, which are represented by functions that take a source image and a size and return a re-scaled image.
Resampling filters are represented by functions that take a source image and a size and return a rescaled raw RGBA buffer. This allows the users of this crate to provide their custom resampling filters. Common resampling filters are provided by the resample module.
The Icon::add_entry can be used to automatically resample
source images and converts them to entries in an icon.
```rust use iconwriter::{Ico, Image, Icon, IconError};
fn example() -> Result<(), IconError> { let icon = Ico::new(); let src = Image::open("image.svg")?; icon.add_entry(resample::linear, &img, 32) } ```
Implementors of the Icon trait can be written to any object
that implements io::Write with the Icon::write method.
```rust use iconwriter::favicon::Favicon; use std::{io, fs::File};
fn example() -> io::Result<()> { let icon = Favicon::new();
// Process the icon ...
let file = File::create("out.icns")?;
icon.write(file)
} ```
Alternatively, icons can be directly written to a file on
disk with Icon::save method.
```rust use iconwriter::favicon::Favicon; use std::{io, fs::File};
fn example() -> io::Result<()> { let icon = Favicon::new();
/* Process the icon */
icon.save("./output/")
} ```
This are the output formats IconWriter nativally supports. Be aware that custum output types can
be created using the Icon trait.
icoicnsIconWriter uses the icns crate for generating .icns files. The
supported icon types are specified
by the creators of such crate as follows:
| OSType | Description | Supported? |
|--------|----------------------------------------------|--------------|
| ICON | 32×32 1-bit entry | No |
| ICN# | 32×32 1-bit entry with 1-bit mask | No |
| icm# | 16×12 1-bit entry with 1-bit mask | No |
| icm4 | 16×12 4-bit entry | No |
| icm8 | 16×12 8-bit entry | No |
| ics# | 16×16 1-bit mask | No |
| ics4 | 16×16 4-bit entry | No |
| ics8 | 16x16 8-bit entry | No |
| is32 | 16×16 24-bit entry | Yes |
| s8mk | 16x16 8-bit mask | Yes |
| icl4 | 32×32 4-bit entry | No |
| icl8 | 32×32 8-bit entry | No |
| il32 | 32x32 24-bit entry | Yes |
| l8mk | 32×32 8-bit mask | Yes |
| ich# | 48×48 1-bit mask | No |
| ich4 | 48×48 4-bit entry | No |
| ich8 | 48×48 8-bit entry | No |
| ih32 | 48×48 24-bit entry | Yes |
| h8mk | 48×48 8-bit mask | Yes |
| it32 | 128×128 24-bit entry | Yes |
| t8mk | 128×128 8-bit mask | Yes |
| icp4 | 16x16 32-bit png/jp2 entry | png only |
| icp5 | 32x32 32-bit png/jp2 entry | png only |
| icp6 | 64x64 32-bit png/jp2 entry | png only |
| ic07 | 128x128 32-bit png/jp2 entry | png only |
| ic08 | 256×256 32-bit png/jp2 entry | png only |
| ic09 | 512×512 32-bit png/jp2 entry | png only |
| ic10 | 512x512@2x "retina" 32-bit png/jp2 entry | png only |
| ic11 | 16x16@2x "retina" 32-bit png/jp2 entry | png only |
| ic12 | 32x32@2x "retina" 32-bit png/jp2 entry | png only |
| ic13 | 128x128@2x "retina" 32-bit png/jp2 entry | png only |
| ic14 | 256x256@2x "retina" 32-bit png/jp2 entry | png only |
IconWriter uses image for raster graphics manipulations and
resvg with the raqote
backend for svg rasterization. Note that raqote requires cmake to build.
| Format | Supported? |
|--------|------------------------------------------------------------------------|
| png | All supported color types |
| jpeg | Baseline and progressive |
| gif | Yes |
| bmp | Yes |
| ico | Yes |
| tiff | Baseline(no fax support), lzw, PackBits |
| webp | Lossy(Luma channel only) |
| pnm | pbm, pgm, ppm, standard pma |
| svg | Static SVG Full 1.1 |