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Improve gl.putImageData

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This commit should allow us to send smaller blobs to the canvas thread,
I made it into its own commit just to try=wpt.
This commit is contained in:
Anthony Ramine 2018-10-04 16:29:45 +02:00
parent 3d910feb3a
commit 82c7d71811
2 changed files with 31 additions and 8 deletions
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30
components/script/dom/canvasrenderingcontext2d.rs
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@ -31,7 +31,7 @@ use dom::htmlcanvaselement::{CanvasContext, HTMLCanvasElement};
use dom::imagedata::ImageData;
use dom::node::{Node, NodeDamage, window_from_node};
use dom_struct::dom_struct;
use euclid::{Transform2D, Point2D, Vector2D, Rect, Size2D, vec2};
use euclid::{Transform2D, Point2D, Rect, Size2D, vec2};
use ipc_channel::ipc::{self, IpcSender};
use net_traits::image::base::PixelFormat;
use net_traits::image_cache::CanRequestImages;
@ -1206,6 +1206,9 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
mut dirty_width: i32,
mut dirty_height: i32,
) {
// FIXME(nox): There are many arithmetic operations here that can
// overflow or underflow, this should probably be audited.
let imagedata_size = Size2D::new(imagedata.Width() as i32, imagedata.Height() as i32);
if imagedata_size.width <= 0 || imagedata_size.height <= 0 {
return;
@ -1227,6 +1230,21 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
dirty_height = -dirty_height;
}
// Ignore any pixel that would be drawn before the beginning of the
// canvas surface.
let mut dest_x = dx + dirty_x;
let mut dest_y = dy + dirty_y;
if dest_x < 0 {
dirty_x -= dest_x;
dirty_width += dest_x;
dest_x = 0;
}
if dest_y < 0 {
dirty_y -= dest_y;
dirty_height += dest_y;
dest_y = 0;
}
// Step 4.
if dirty_x < 0 {
dirty_width += dirty_x;
@ -1245,6 +1263,14 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
dirty_height = imagedata_size.height - dirty_y;
}
// We take care of ignoring any pixel that would be drawn after the end
// of the canvas surface.
let canvas_size = self.canvas.as_ref().map_or(Size2D::zero(), |c| c.get_size()).to_i32();
let origin = Point2D::new(dest_x, dest_y);
let drawable_size = (origin - canvas_size.to_vector().to_point()).to_size().abs();
dirty_width = dirty_width.min(drawable_size.width);
dirty_height = dirty_height.min(drawable_size.height);
// Step 6.
if dirty_width <= 0 || dirty_height <= 0 {
return;
@ -1257,7 +1283,7 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
// Step 7.
self.send_canvas_2d_msg(Canvas2dMsg::PutImageData(
buffer.into(),
Vector2D::new(dx, dy),
origin.to_vector(),
imagedata_size,
Rect::new(
Point2D::new(dirty_x, dirty_y),