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use std::cell::{Cell, RefCell};
use cairo;
use attributes::Attribute;
use error::NodeError;
use handle::RsvgHandle;
use node::{NodeResult, NodeTrait, RsvgCNodeImpl, RsvgNode};
use parsers::ParseError;
use property_bag::PropertyBag;
use surface_utils::shared_surface::SharedImageSurface;
use super::context::{FilterContext, FilterOutput, FilterResult};
use super::input::Input;
use super::{make_result, Filter, FilterError, PrimitiveWithInput};
/// Enumeration of the possible blending modes.
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
enum Mode {
Normal,
Multiply,
Screen,
Darken,
Lighten,
}
/// The `feBlend` filter primitive.
pub struct Blend {
base: PrimitiveWithInput,
in2: RefCell<Option<Input>>,
mode: Cell<Mode>,
}
impl Blend {
/// Constructs a new `Blend` with empty properties.
#[inline]
pub fn new() -> Blend {
Blend {
base: PrimitiveWithInput::new::<Self>(),
in2: RefCell::new(None),
mode: Cell::new(Mode::Normal),
}
}
}
impl NodeTrait for Blend {
fn set_atts(
&self,
node: &RsvgNode,
handle: *const RsvgHandle,
pbag: &PropertyBag,
) -> NodeResult {
self.base.set_atts(node, handle, pbag)?;
for (_key, attr, value) in pbag.iter() {
match attr {
Attribute::In2 => {
self.in2.replace(Some(Input::parse(attr, value)?));
}
Attribute::Mode => self.mode.set(Mode::parse(attr, value)?),
_ => (),
}
}
Ok(())
}
#[inline]
fn get_c_impl(&self) -> *const RsvgCNodeImpl {
self.base.get_c_impl()
}
}
impl Filter for Blend {
fn render(&self, _node: &RsvgNode, ctx: &FilterContext) -> Result<FilterResult, FilterError> {
let input = make_result(self.base.get_input(ctx))?;
let input_2 = make_result(ctx.get_input(self.in2.borrow().as_ref()))?;
let bounds = self
.base
.get_bounds(ctx)
.add_input(&input)
.add_input(&input_2)
.into_irect();
let output_surface = input_2
.surface()
.copy_surface(bounds)
.map_err(FilterError::OutputSurfaceCreation)?;
{
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(self.mode.get().into());
cr.paint();
}
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
}
}
impl Mode {
fn parse(attr: Attribute, s: &str) -> Result<Self, NodeError> {
match s {
"normal" => Ok(Mode::Normal),
"multiply" => Ok(Mode::Multiply),
"screen" => Ok(Mode::Screen),
"darken" => Ok(Mode::Darken),
"lighten" => Ok(Mode::Lighten),
_ => Err(NodeError::parse_error(
attr,
ParseError::new("invalid value"),
)),
}
}
}
impl From<Mode> for cairo::Operator {
#[inline]
fn from(x: Mode) -> Self {
match x {
Mode::Normal => cairo::Operator::Over,
Mode::Multiply => cairo::Operator::Multiply,
Mode::Screen => cairo::Operator::Screen,
Mode::Darken => cairo::Operator::Darken,
Mode::Lighten => cairo::Operator::Lighten,
}
}
}
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