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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/.
use std::path;
// external
use base64;
use svgdom;
// self
use tree;
use short::{
AId,
};
use traits::{
GetValue,
};
use math::*;
use {
Options,
};
pub(super) fn convert(
node: &svgdom::Node,
opt: &Options,
parent: tree::NodeId,
rtree: &mut tree::RenderTree,
) {
let attrs = node.attributes();
let ts = attrs.get_transform(AId::Transform).unwrap_or_default();
let x = attrs.get_number(AId::X).unwrap_or(0.0);
let y = attrs.get_number(AId::Y).unwrap_or(0.0);
macro_rules! get_attr {
($aid:expr) => (
if let Some(v) = attrs.get_type($aid) {
v
} else {
warn!("The 'image' element lacks '{}' attribute. Skipped.", $aid);
return;
}
)
}
let w: f64 = *get_attr!(AId::Width);
let h: f64 = *get_attr!(AId::Height);
let href: &String = get_attr!(AId::XlinkHref);
if let Some(data) = get_href_data(href, opt.path.as_ref()) {
rtree.append_child(parent, tree::NodeKind::Image(tree::Image {
id: node.id().clone(),
transform: ts,
rect: Rect::from_xywh(x, y, w, h),
data: data,
}));
}
}
fn get_href_data(
href: &str,
path: Option<&path::PathBuf>,
) -> Option<tree::ImageData> {
if href.starts_with("data:image") {
if let Some(idx) = href.find(',') {
let kind = if href[..idx].contains("image/jpg") {
tree::ImageDataKind::JPEG
} else if href[..idx].contains("image/png") {
tree::ImageDataKind::PNG
} else {
return None;
};
let base_data = &href[(idx + 1)..];
let conf = base64::Config::new(
base64::CharacterSet::Standard,
true,
true,
base64::LineWrap::NoWrap,
);
if let Ok(data) = base64::decode_config(base_data, conf) {
return Some(tree::ImageData::Raw(data.to_owned(), kind));
}
}
warn!("Invalid xlink:href content.");
} else {
let path = match path {
Some(path) => path.parent().unwrap().join(href),
None => path::PathBuf::from(href),
};
if path.exists() {
if is_valid_image_format(&path) {
return Some(tree::ImageData::Path(path.to_owned()));
} else {
warn!("'{}' is not a PNG or a JPEG image.", href);
}
} else {
warn!("Linked file does not exist: '{}'.", href);
}
}
None
}
/// Checks that file has a PNG or a JPEG magic bytes.
fn is_valid_image_format(path: &path::Path) -> bool {
use std::fs;
use std::io::Read;
macro_rules! try_bool {
($e:expr) => {
match $e {
Ok(v) => v,
Err(_) => return false,
}
};
}
let mut file = try_bool!(fs::File::open(path));
let mut d = Vec::new();
d.resize(8, 0);
try_bool!(file.read_exact(&mut d));
d.starts_with(b"\x89PNG\r\n\x1a\n") || d.starts_with(&[0xff, 0xd8, 0xff])
}
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