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|
use std::cell::RefCell;
use cairo::{self, ImageSurface};
use attributes::Attribute;
use handle::RsvgHandle;
use node::{NodeResult, NodeTrait, NodeType, RsvgCNodeImpl, RsvgNode};
use property_bag::PropertyBag;
use surface_utils::shared_surface::SharedImageSurface;
use super::context::{FilterContext, FilterOutput, FilterResult, IRect};
use super::input::Input;
use super::{make_result, Filter, FilterError, Primitive};
/// The `feMerge` filter primitive.
pub struct Merge {
base: Primitive,
}
/// The `<feMergeNode>` element.
pub struct MergeNode {
in_: RefCell<Option<Input>>,
}
impl Merge {
/// Constructs a new `Merge` with empty properties.
#[inline]
pub fn new() -> Merge {
Merge {
base: Primitive::new::<Self>(),
}
}
}
impl MergeNode {
/// Constructs a new `MergeNode` with empty properties.
#[inline]
pub fn new() -> MergeNode {
MergeNode {
in_: RefCell::new(None),
}
}
}
impl NodeTrait for Merge {
#[inline]
fn set_atts(
&self,
node: &RsvgNode,
handle: *const RsvgHandle,
pbag: &PropertyBag,
) -> NodeResult {
self.base.set_atts(node, handle, pbag)
}
#[inline]
fn get_c_impl(&self) -> *const RsvgCNodeImpl {
self.base.get_c_impl()
}
}
impl NodeTrait for MergeNode {
#[inline]
fn set_atts(
&self,
_node: &RsvgNode,
_handle: *const RsvgHandle,
pbag: &PropertyBag,
) -> NodeResult {
for (_key, attr, value) in pbag.iter() {
match attr {
Attribute::In => {
self.in_.replace(Some(Input::parse(Attribute::In, value)?));
}
_ => (),
}
}
Ok(())
}
}
impl MergeNode {
fn render(
&self,
ctx: &FilterContext,
bounds: IRect,
output_surface: Option<ImageSurface>,
) -> Result<ImageSurface, FilterError> {
let input = make_result(ctx.get_input(self.in_.borrow().as_ref()))?;
if output_surface.is_none() {
return input
.surface()
.copy_surface(bounds)
.map_err(FilterError::OutputSurfaceCreation);
}
let output_surface = output_surface.unwrap();
let cr = cairo::Context::new(&output_surface);
cr.rectangle(
bounds.x0 as f64,
bounds.y0 as f64,
(bounds.x1 - bounds.x0) as f64,
(bounds.y1 - bounds.y0) as f64,
);
cr.clip();
input.surface().set_as_source_surface(&cr, 0f64, 0f64);
cr.set_operator(cairo::Operator::Over);
cr.paint();
Ok(output_surface)
}
}
impl Filter for Merge {
fn render(&self, node: &RsvgNode, ctx: &FilterContext) -> Result<FilterResult, FilterError> {
// Compute the filter bounds, taking each child node's input into account.
let mut bounds = self.base.get_bounds(ctx);
for child in node
.children()
.filter(|c| c.get_type() == NodeType::FilterPrimitiveMergeNode)
{
bounds = bounds.add_input(&child.with_impl(move |c: &MergeNode| {
make_result(ctx.get_input(c.in_.borrow().as_ref()))
})?);
}
let bounds = bounds.into_irect();
// Now merge them all.
let mut output_surface = None;
for child in node
.children()
.filter(|c| c.get_type() == NodeType::FilterPrimitiveMergeNode)
{
output_surface =
Some(child.with_impl(move |c: &MergeNode| c.render(ctx, bounds, output_surface))?);
}
let output_surface = match output_surface {
Some(surface) => surface,
None => ImageSurface::create(
cairo::Format::ARgb32,
ctx.source_graphic().width(),
ctx.source_graphic().height(),
).map_err(FilterError::OutputSurfaceCreation)?,
};
Ok(FilterResult {
name: self.base.result.borrow().clone(),
output: FilterOutput {
surface: SharedImageSurface::new(output_surface).unwrap(),
bounds,
},
})
}
#[inline]
fn is_affected_by_color_interpolation_filters() -> bool {
true
}
}
|
