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Share some code between 2D canvas and WebGL

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This commit is contained in:
Anthony Ramine 2018-10-08 13:49:58 +02:00
parent 05ef233097
commit 6c469b90b1
6 changed files with 58 additions and 84 deletions
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24
components/script/dom/canvasrenderingcontext2d.rs
View file

@ -1168,7 +1168,7 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
// FIXME(nox): This is probably wrong when this is a context for an
// offscreen canvas.
let canvas_size = self.canvas.as_ref().map_or(Size2D::zero(), |c| c.get_size());
let read_rect = match clip(origin, size, canvas_size) {
let read_rect = match pixels::clip(origin, size, canvas_size) {
Some(rect) => rect,
None => {
// All the pixels are outside the canvas surface.
@ -1220,7 +1220,7 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
Point2D::new(dirty_x, dirty_y),
Size2D::new(dirty_width, dirty_height),
);
let src_rect = match clip(src_origin, src_size, imagedata_size) {
let src_rect = match pixels::clip(src_origin, src_size, imagedata_size) {
Some(rect) => rect,
None => return,
};
@ -1230,7 +1230,7 @@ impl CanvasRenderingContext2DMethods for CanvasRenderingContext2D {
);
// By clipping to the canvas surface, we avoid sending any pixel
// that would fall outside it.
let dst_rect = match clip(dst_origin, src_rect.size, canvas_size) {
let dst_rect = match pixels::clip(dst_origin, src_rect.size, canvas_size) {
Some(rect) => rect,
None => return,
};
@ -1537,21 +1537,3 @@ fn adjust_size_sign(
}
(origin, size.to_u32())
}
fn clip(
mut origin: Point2D<i32>,
mut size: Size2D<u32>,
surface: Size2D<u32>,
) -> Option<Rect<u32>> {
if origin.x < 0 {
size.width = size.width.saturating_sub(-origin.x as u32);
origin.x = 0;
}
if origin.y < 0 {
size.height = size.height.saturating_sub(-origin.y as u32);
origin.y = 0;
}
Rect::new(origin.to_u32(), size)
.intersection(&Rect::from_size(surface))
.filter(|rect| !rect.is_empty())
}

4
components/script/dom/htmlcanvaselement.rs
View file

@ -368,13 +368,13 @@ impl HTMLCanvasElementMethods for HTMLCanvasElement {
context.get_rect(Rect::from_size(self.get_size()))
},
Some(CanvasContext::WebGL(ref context)) => {
match context.get_image_data(self.Width(), self.Height()) {
match context.get_image_data(self.get_size()) {
Some(data) => data,
None => return Ok(USVString("data:,".into())),
}
},
Some(CanvasContext::WebGL2(ref context)) => {
match context.base_context().get_image_data(self.Width(), self.Height()) {
match context.base_context().get_image_data(self.get_size()) {
Some(data) => data,
None => return Ok(USVString("data:,".into())),
}

63
components/script/dom/webglrenderingcontext.rs
View file

@ -52,7 +52,7 @@ use dom::webgluniformlocation::WebGLUniformLocation;
use dom::webglvertexarrayobjectoes::WebGLVertexArrayObjectOES;
use dom::window::Window;
use dom_struct::dom_struct;
use euclid::Size2D;
use euclid::{Point2D, Rect, Size2D};
use half::f16;
use ipc_channel::ipc;
use js::jsapi::{JSContext, JSObject, Type};
@ -1070,7 +1070,7 @@ impl WebGLRenderingContext {
// can fail and that it is UB what happens in that case.
//
// https://www.khronos.org/registry/webgl/specs/latest/1.0/#2.2
pub fn get_image_data(&self, width: u32, height: u32) -> Option<Vec<u8>> {
pub fn get_image_data(&self, mut size: Size2D<u32>) -> Option<Vec<u8>> {
handle_potential_webgl_error!(self, self.validate_framebuffer(), return None);
let (fb_width, fb_height) = handle_potential_webgl_error!(
@ -1078,15 +1078,12 @@ impl WebGLRenderingContext {
self.get_current_framebuffer_size().ok_or(InvalidOperation),
return None
);
let width = cmp::min(width, fb_width as u32);
let height = cmp::min(height, fb_height as u32);
size.width = cmp::min(size.width, fb_width as u32);
size.height = cmp::min(size.height, fb_height as u32);
let (sender, receiver) = ipc::bytes_channel().unwrap();
self.send_command(WebGLCommand::ReadPixels(
0,
0,
width as i32,
height as i32,
Rect::from_size(size),
constants::RGBA,
constants::UNSIGNED_BYTE,
sender,
@ -2879,45 +2876,29 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
return self.webgl_error(InvalidOperation);
}
let mut src_x = x;
let mut src_y = y;
let mut src_width = width;
let mut src_height = height;
let src_origin = Point2D::new(x, y);
let src_size = Size2D::new(width as u32, height as u32);
let fb_size = Size2D::new(fb_width as u32, fb_height as u32);
let src_rect = match pixels::clip(src_origin, src_size, fb_size) {
Some(rect) => rect,
None => return,
};
let mut dest_offset = 0;
if src_x < 0 {
if src_width <= -src_x {
return;
}
dest_offset += bytes_per_pixel * -src_x;
src_width += src_x;
src_x = 0;
if x < 0 {
dest_offset += -x * bytes_per_pixel;
}
if src_y < 0 {
if src_height <= -src_y {
return;
}
dest_offset += row_len * -src_y;
src_height += src_y;
src_y = 0;
}
if src_x + src_width > fb_width {
src_width = fb_width - src_x;
}
if src_y + src_height > fb_height {
src_height = fb_height - src_y;
if y < 0 {
dest_offset += -y * row_len;
}
let (sender, receiver) = ipc::bytes_channel().unwrap();
self.send_command(WebGLCommand::ReadPixels(
src_x, src_y, src_width, src_height, format, pixel_type, sender,
));
self.send_command(WebGLCommand::ReadPixels(src_rect, format, pixel_type, sender));
let src = receiver.recv().unwrap();
let src_row_len = (src_width * bytes_per_pixel) as usize;
for i in 0..src_height {
let dest_start = (dest_offset + i * dest_stride) as usize;
let src_row_len = src_rect.size.width as usize * bytes_per_pixel as usize;
for i in 0..src_rect.size.height {
let dest_start = dest_offset as usize + i as usize * dest_stride as usize;
let dest_end = dest_start + src_row_len;
let src_start = i as usize * src_row_len;
let src_end = src_start + src_row_len;