Qt backend for resvg

resvg backend implementation using the [Qt] library.

Build

Since there are no Qt binding for Rust yet, we are using our own. This complicates the build process a bit.

On Windows and macOS, the build process consists of setting the QT_DIR environment variable and running cargo build. On Linux we are using pkg-config instead.

on Windows using MSVC

Install:

• stable-x86_64-pc-windows-msvc [Rust] target.
• Qt built with MSVC.

Build using x64 Native Tools Command Prompt for VS 2017 shell:

```batch set PATH=%userprofile%.cargo\bin;%PATH% set QTDIR=C:\Qt\5.12.0\msvc201764 rustup.exe default stable-x86_64-pc-windows-msvc

cargo.exe build --release ```

Instead of msvc2017_64 you can use any other Qt MSVC build. Even 32-bit one. We are using Qt 5.12.0 just for example.

on Windows using MinGW

Install:

• stable-x86_64-pc-windows-gnu [Rust] target.
• Qt built with MinGW 64-bit + mingw bundled with Qt.

Build using cmd.exe:

```batch set PATH=C:\Qt\5.12.0\mingw7364\bin;C:\Qt\Tools\mingw73064\bin;%userprofile%.cargo\bin;%PATH% set QTDIR=C:\Qt\5.12.0\mingw7364 rustup.exe default stable-x86_64-pc-windows-gnu

cargo.exe build --release ```

Instead of mingw73_64 you can use any other Qt mingw build. We are using Qt 5.12.0 just for example.

on Linux

Install Qt and harfbuzz using your distributive's package manager.

On Ubuntu you can install them via:

sudo apt install qtbase5-dev libharfbuzz-dev

Build resvg:

sh cargo build --release

If you don't want to use the system Qt, you can alter it with the PKG_CONFIG_PATH variable.

sh PKG_CONFIG_PATH='/path_to_qt/lib/pkgconfig' cargo build --release

on macOS

Using an official Qt installer:

sh QT_DIR=/Users/$USER/Qt/5.12.0/clang_64 cargo build --release

or homebrew:

```sh brew install qt

QT_DIR=/usr/local/opt/qt cargo build --release ```

We are using Qt 5.12.0 just for example.

Runtime dependencies

resvg-qt depends only on QtCore and QtGui libraries and imageformats/qjpeg plugin.

Technically, any Qt 5 version should work, but we only support Qt >= 5.6.

Running resvg CLI

sh cargo run --release -- in.svg out.png

The resulting binary can be found at: target/release/resvg-qt

Running examples

Note: we assume that you have already set up the QT_DIR variable or pkg-config, as was described above.

A simple SVG to PNG converter:

sh cargo run --example minimal -- in.svg out.png

Render image using a manually constructed SVG render tree:

sh cargo run --example custom_rtree

Draw bounding boxes around all shapes on input SVG:

sh cargo run --example draw_bboxes -- bboxes.svg bboxes.png -z 4

License

MPLv2.0.