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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/.
// external
use cairo::{
self,
MatrixTrait,
};
use usvg;
use usvg::prelude::*;
// self
use super::prelude::*;
use super::{
path,
text,
};
pub fn apply(
node: &usvg::Node,
cp: &usvg::ClipPath,
opt: &Options,
bbox: Rect,
layers: &mut CairoLayers,
cr: &cairo::Context,
) {
let clip_surface = try_opt!(layers.get(), ());
let clip_surface = clip_surface.borrow_mut();
let clip_cr = cairo::Context::new(&*clip_surface);
clip_cr.set_source_rgba(0.0, 0.0, 0.0, 1.0);
clip_cr.paint();
clip_cr.set_matrix(cr.get_matrix());
clip_cr.transform(cp.transform.to_native());
if cp.units == usvg::Units::ObjectBoundingBox {
let m = cairo::Matrix::from_bbox(bbox);
clip_cr.transform(m);
}
clip_cr.set_operator(cairo::Operator::Clear);
let matrix = clip_cr.get_matrix();
for node in node.children() {
clip_cr.transform(node.transform().to_native());
match *node.borrow() {
usvg::NodeKind::Path(ref p) => {
path::draw(&node.tree(), p, opt, &clip_cr);
}
usvg::NodeKind::Text(ref text) => {
text::draw(&node.tree(), text, opt, &clip_cr);
}
usvg::NodeKind::Group(ref g) => {
clip_group(&node, g, opt, bbox, layers, &clip_cr);
}
_ => {}
}
clip_cr.set_matrix(matrix);
}
if let Some(ref id) = cp.clip_path {
if let Some(ref clip_node) = node.tree().defs_by_id(id) {
if let usvg::NodeKind::ClipPath(ref cp) = *clip_node.borrow() {
apply(clip_node, cp, opt, bbox, layers, cr);
}
}
}
cr.set_matrix(cairo::Matrix::identity());
cr.set_source_surface(&*clip_surface, 0.0, 0.0);
cr.set_operator(cairo::Operator::DestOut);
cr.paint();
// Reset operator.
cr.set_operator(cairo::Operator::Over);
// Reset source to unborrow the `clip_surface` from the `Context`.
cr.reset_source_rgba();
}
fn clip_group(
node: &usvg::Node,
g: &usvg::Group,
opt: &Options,
bbox: Rect,
layers: &mut CairoLayers,
cr: &cairo::Context,
) {
if let Some(ref id) = g.clip_path {
if let Some(ref clip_node) = node.tree().defs_by_id(id) {
if let usvg::NodeKind::ClipPath(ref cp) = *clip_node.borrow() {
// If a `clipPath` child also has a `clip-path`
// then we should render this child on a new canvas,
// clip it, and only then draw it to the `clipPath`.
let clip_surface = try_opt!(layers.get(), ());
let clip_surface = clip_surface.borrow_mut();
let clip_cr = cairo::Context::new(&*clip_surface);
clip_cr.set_source_rgba(0.0, 0.0, 0.0, 0.0);
clip_cr.paint();
clip_cr.set_matrix(cr.get_matrix());
draw_group_child(&node, opt, &clip_cr);
apply(clip_node, cp, opt, bbox, layers, &clip_cr);
cr.set_matrix(cairo::Matrix::identity());
cr.set_operator(cairo::Operator::Xor);
cr.set_source_surface(&*clip_surface, 0.0, 0.0);
cr.set_operator(cairo::Operator::DestOut);
cr.paint();
}
}
}
// TODO: mask
}
fn draw_group_child(
node: &usvg::Node,
opt: &Options,
cr: &cairo::Context,
) {
if let Some(child) = node.first_child() {
cr.transform(child.transform().to_native());
match *child.borrow() {
usvg::NodeKind::Path(ref path_node) => {
path::draw(&child.tree(), path_node, opt, cr);
}
usvg::NodeKind::Text(ref text) => {
text::draw(&child.tree(), text, opt, cr);
}
_ => {}
}
}
}
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