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Implement Canvas pixel manipulation
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parent
e68d6d2924
commit
325400dce4
14 changed files with 305 additions and 84 deletions
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@ -4,19 +4,24 @@
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use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding;
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use dom::bindings::codegen::Bindings::CanvasRenderingContext2DBinding::CanvasRenderingContext2DMethods;
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use dom::bindings::codegen::Bindings::ImageDataBinding::ImageDataMethods;
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use dom::bindings::error::Error::IndexSize;
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use dom::bindings::error::Fallible;
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use dom::bindings::global::{GlobalRef, GlobalField};
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use dom::bindings::js::{JS, JSRef, LayoutJS, Temporary};
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use dom::bindings::utils::{Reflector, reflect_dom_object};
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use dom::htmlcanvaselement::HTMLCanvasElement;
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use dom::htmlcanvaselement::{HTMLCanvasElement, HTMLCanvasElementHelpers};
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use dom::imagedata::{ImageData, ImageDataHelpers};
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use geom::point::Point2D;
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use geom::rect::Rect;
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use geom::size::Size2D;
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use canvas::canvas_paint_task::{CanvasMsg, CanvasPaintTask};
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use canvas::canvas_paint_task::CanvasMsg::{ClearRect, Close, FillRect, Recreate, StrokeRect};
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use canvas::canvas_paint_task::CanvasMsg::{ClearRect, Close, FillRect, Recreate, StrokeRect, GetImageData, PutImageData};
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use std::sync::mpsc::Sender;
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use std::num::{Float, ToPrimitive};
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use std::sync::mpsc::{channel, Sender};
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#[dom_struct]
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pub struct CanvasRenderingContext2D {
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@ -75,6 +80,52 @@ impl<'a> CanvasRenderingContext2DMethods for JSRef<'a, CanvasRenderingContext2D>
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let rect = Rect(Point2D(x as f32, y as f32), Size2D(width as f32, height as f32));
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self.renderer.send(StrokeRect(rect)).unwrap();
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}
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fn CreateImageData(self, sw: f64, sh: f64) -> Fallible<Temporary<ImageData>> {
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if sw == 0.0 || sh == 0.0 {
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return Err(IndexSize)
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}
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Ok(ImageData::new(self.global.root().r(), sw.abs().to_u32().unwrap(), sh.abs().to_u32().unwrap(), None))
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}
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fn CreateImageData_(self, imagedata: JSRef<ImageData>) -> Fallible<Temporary<ImageData>> {
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Ok(ImageData::new(self.global.root().r(), imagedata.Width(), imagedata.Height(), None))
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}
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fn GetImageData(self, sx: f64, sy: f64, sw: f64, sh: f64) -> Fallible<Temporary<ImageData>> {
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if sw == 0.0 || sh == 0.0 {
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return Err(IndexSize)
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}
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let (sender, receiver) = channel::<Vec<u8>>();
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let dest_rect = Rect(Point2D(sx.to_i32().unwrap(), sy.to_i32().unwrap()), Size2D(sw.to_i32().unwrap(), sh.to_i32().unwrap()));
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let canvas_size = self.canvas.root().r().get_size();
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self.renderer.send(GetImageData(dest_rect, canvas_size, sender)).unwrap();
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let data = receiver.recv().unwrap();
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Ok(ImageData::new(self.global.root().r(), sw.abs().to_u32().unwrap(), sh.abs().to_u32().unwrap(), Some(data)))
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}
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fn PutImageData(self, imagedata: JSRef<ImageData>, dx: f64, dy: f64) {
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let data = imagedata.get_data_array(&self.global.root().r());
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let image_data_rect = Rect(Point2D(dx.to_i32().unwrap(), dy.to_i32().unwrap()), imagedata.get_size());
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let dirty_rect = None;
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let canvas_size = self.canvas.root().r().get_size();
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self.renderer.send(PutImageData(data, image_data_rect, dirty_rect, canvas_size)).unwrap()
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}
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fn PutImageData_(self, imagedata: JSRef<ImageData>, dx: f64, dy: f64,
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dirtyX: f64, dirtyY: f64, dirtyWidth: f64, dirtyHeight: f64) {
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let data = imagedata.get_data_array(&self.global.root().r());
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let image_data_rect = Rect(Point2D(dx.to_i32().unwrap(), dy.to_i32().unwrap()),
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Size2D(imagedata.Width().to_i32().unwrap(),
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imagedata.Height().to_i32().unwrap()));
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let dirty_rect = Some(Rect(Point2D(dirtyX.to_i32().unwrap(), dirtyY.to_i32().unwrap()),
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Size2D(dirtyWidth.to_i32().unwrap(),
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dirtyHeight.to_i32().unwrap())));
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let canvas_size = self.canvas.root().r().get_size();
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self.renderer.send(PutImageData(data, image_data_rect, dirty_rect, canvas_size)).unwrap()
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}
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}
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#[unsafe_destructor]
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