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use std::cell::Cell;
use std::slice;
use cairo::prelude::SurfaceExt;
use cairo::{self, ImageSurface};
use cairo_sys;
use libc::c_char;
use attributes::Attribute;
use drawing_ctx::RsvgDrawingCtx;
use filter_context::{FilterContext, FilterResult};
use handle::RsvgHandle;
use length::{LengthDir, RsvgLength};
use node::{
boxed_node_new,
CascadedValues,
NodeResult,
NodeTrait,
NodeType,
RsvgCNodeImpl,
RsvgNode,
};
use parsers::{parse, Parse};
use property_bag::PropertyBag;
use super::{Filter, PrimitiveWithInput};
/// The `feOffset` filter primitive.
struct Offset {
base: PrimitiveWithInput,
dx: Cell<RsvgLength>,
dy: Cell<RsvgLength>,
}
impl Offset {
/// Constructs a new `Offset` with empty properties.
#[inline]
fn new() -> Offset {
Offset {
base: PrimitiveWithInput::new::<Self>(),
dx: Cell::new(RsvgLength::parse("0", LengthDir::Horizontal).unwrap()),
dy: Cell::new(RsvgLength::parse("0", LengthDir::Vertical).unwrap()),
}
}
}
impl NodeTrait for Offset {
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::Dx => self
.dx
.set(parse("dx", value, LengthDir::Horizontal, None)?),
Attribute::Dy => self.dy.set(parse("dy", value, LengthDir::Vertical, None)?),
_ => (),
}
}
Ok(())
}
#[inline]
fn draw(&self, _: &RsvgNode, _: &CascadedValues, _: *mut RsvgDrawingCtx, _: i32, _: bool) {
// Nothing; filters are drawn in rsvg-cairo-draw.c.
}
#[inline]
fn get_c_impl(&self) -> *const RsvgCNodeImpl {
self.base.get_c_impl()
}
}
impl Filter for Offset {
fn render(&self, node: &RsvgNode, ctx: &mut FilterContext) {
let cascaded = node.get_cascaded_values();
let values = cascaded.get();
let bounds = self.base.get_bounds(ctx);
let dx = self.dx.get().normalize(&values, ctx.drawing_context());
let dy = self.dy.get().normalize(&values, ctx.drawing_context());
let paffine = ctx.paffine();
let ox = (paffine.xx * dx + paffine.xy * dy) as i32;
let oy = (paffine.yx * dx + paffine.yy * dy) as i32;
let input_surface = match self.base.get_input(ctx) {
Some(FilterResult { surface, .. }) => surface,
None => return,
};
let width = input_surface.get_width();
let height = input_surface.get_height();
let input_stride = input_surface.get_stride();
// TODO: this currently gives "non-exclusive access" (can we make read-only borrows?)
// let input_data = input_surface.get_data().unwrap();
input_surface.flush();
if input_surface.status() != cairo::Status::Success {
return;
}
let input_data_ptr =
unsafe { cairo_sys::cairo_image_surface_get_data(input_surface.to_raw_none()) };
if input_data_ptr.is_null() {
return;
}
let input_data_len = input_stride as usize * height as usize;
let input_data = unsafe { slice::from_raw_parts(input_data_ptr, input_data_len) };
let mut output_surface = match ImageSurface::create(cairo::Format::ARgb32, width, height) {
Ok(surface) => surface,
Err(_) => return,
};
let output_stride = output_surface.get_stride();
{
let mut output_data = output_surface.get_data().unwrap();
for y in bounds.y0..bounds.y1 {
for x in bounds.x0..bounds.x1 {
if x - ox < bounds.x0
|| x - ox >= bounds.x1
|| y - oy < bounds.y0
|| y - oy >= bounds.y1
{
continue;
}
for ch in 0..4 {
let input_index = ((y - oy) * input_stride + (x - ox) * 4 + ch) as usize;
let output_index = (y * output_stride + x * 4 + ch) as usize;
output_data[output_index] = input_data[input_index];
}
}
}
}
ctx.store_result(
self.base.result.borrow().clone(),
FilterResult {
surface: output_surface,
bounds,
},
);
}
}
/// Returns a new `feOffset` node.
#[no_mangle]
pub unsafe extern "C" fn rsvg_new_filter_primitive_offset(
_element_name: *const c_char,
parent: *mut RsvgNode,
) -> *mut RsvgNode {
let filter = Offset::new();
boxed_node_new(NodeType::FilterPrimitiveOffset, parent, Box::new(filter))
}
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