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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
extern crate resvg;
extern crate fern;
#[cfg(feature = "cairo-backend")]
extern crate glib;
#[cfg(feature = "cairo-backend")]
extern crate cairo_sys;
use std::fmt;
use std::ptr;
use std::ffi::{
CStr,
CString,
};
use std::os::raw::{
c_char,
};
#[cfg(feature = "qt-backend")]
use resvg::qt;
#[cfg(feature = "cairo-backend")]
use resvg::cairo;
#[repr(C)]
pub struct resvg_document(resvg::tree::RenderTree);
macro_rules! on_err {
($err:expr, $msg:expr) => ({
let c_str = CString::new($msg).unwrap();
unsafe { *$err = c_str.into_raw(); }
return ptr::null_mut();
})
}
macro_rules! from_raw_str {
($raw_str:expr, $err:expr, $msg:expr) => ({
let rstr = unsafe {
assert!(!$raw_str.is_null());
CStr::from_ptr($raw_str)
};
let rstr = match rstr.to_str() {
Ok(rstr) => rstr,
Err(_) => on_err!($err, $msg),
};
rstr
})
}
#[no_mangle]
pub extern fn resvg_init_log() {
fern::Dispatch::new()
.format(log_format)
.level(resvg::log::LevelFilter::Warn)
.chain(std::io::stderr())
.apply().unwrap();
}
fn log_format(out: fern::FormatCallback, message: &fmt::Arguments, record: &resvg::log::Record) {
use resvg::log;
let lvl = match record.level() {
log::Level::Error => "Error",
log::Level::Warn => "Warning",
log::Level::Info => "Info",
log::Level::Debug => "Debug",
log::Level::Trace => "Trace",
};
out.finish(format_args!(
"{} (in {}:{}): {}",
lvl,
record.target(),
record.line().unwrap_or(0),
message
))
}
#[no_mangle]
pub extern fn resvg_parse_doc_from_file(
file_path: *const c_char,
dpi: f64,
error: *mut *mut c_char,
) -> *mut resvg_document {
let file_path = from_raw_str!(
file_path,
error,
"Error: the file path is not an UTF-8 string."
);
let opt = resvg::Options {
path: Some(file_path.into()),
dpi: dpi,
.. resvg::Options::default()
};
let doc = match resvg::parse_doc_from_file(file_path, &opt) {
Ok(doc) => doc,
Err(e) => on_err!(error, e.to_string()),
};
let doc_box = Box::new(resvg_document(doc));
Box::into_raw(doc_box)
}
#[no_mangle]
pub extern fn resvg_parse_doc_from_data(
text: *const c_char,
dpi: f64,
error: *mut *mut c_char,
) -> *mut resvg_document {
let text = from_raw_str!(
text,
error,
"Error: the SVG data is not an UTF-8 string."
);
let opt = resvg::Options {
dpi: dpi,
.. resvg::Options::default()
};
let doc = match resvg::parse_doc_from_data(text, &opt) {
Ok(doc) => doc,
Err(e) => on_err!(error, e.to_string()),
};
let doc_box = Box::new(resvg_document(doc));
Box::into_raw(doc_box)
}
#[no_mangle]
pub extern fn resvg_error_msg_destroy(msg: *mut c_char) {
unsafe {
assert!(!msg.is_null());
CString::from_raw(msg)
};
}
#[no_mangle]
pub extern fn resvg_doc_destroy(doc: *mut resvg_document) {
unsafe {
assert!(!doc.is_null());
Box::from_raw(doc)
};
}
#[cfg(feature = "qt-backend")]
#[no_mangle]
pub extern fn resvg_qt_render_to_canvas(
painter: *mut qt::qtc_qpainter,
x: f64,
y: f64,
width: f64,
height: f64,
doc: *mut resvg_document,
) {
let doc = unsafe {
assert!(!doc.is_null());
&mut *doc
};
let painter = unsafe { qt::Painter::from_raw(painter) };
let rect = resvg::Rect::new(x, y, width, height);
resvg::render_qt::render_to_canvas(&painter, rect, &doc.0);
}
#[cfg(feature = "cairo-backend")]
#[no_mangle]
pub extern fn resvg_cairo_render_to_canvas(
cr: *mut cairo_sys::cairo_t,
x: f64,
y: f64,
width: f64,
height: f64,
doc: *mut resvg_document,
) {
let doc = unsafe {
assert!(!doc.is_null());
&mut *doc
};
use glib::translate::FromGlibPtrNone;
let cr = unsafe { cairo::Context::from_glib_none(cr) };
let rect = resvg::Rect::new(x, y, width, height);
resvg::render_cairo::render_to_canvas(&cr, rect, &doc.0);
}
#[no_mangle]
pub extern fn resvg_get_image_size(
doc: *mut resvg_document,
width: *mut f64,
height: *mut f64,
) {
let doc = unsafe {
assert!(!doc.is_null());
&mut *doc
};
let size = doc.0.svg_node().size;
unsafe {
*width = size.w;
*height = size.h;
}
}
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