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-rw-r--r--third_party/rust/wpf-gpu-raster/examples/draw.rs354
-rw-r--r--third_party/rust/wpf-gpu-raster/examples/obj-output.rs26
-rw-r--r--third_party/rust/wpf-gpu-raster/examples/simple.rs11
3 files changed, 391 insertions, 0 deletions
diff --git a/third_party/rust/wpf-gpu-raster/examples/draw.rs b/third_party/rust/wpf-gpu-raster/examples/draw.rs
new file mode 100644
index 0000000000..828449ee72
--- /dev/null
+++ b/third_party/rust/wpf-gpu-raster/examples/draw.rs
@@ -0,0 +1,354 @@
+/* The rasterization code here is based off of piglit/tests/general/triangle-rasterization.cpp:
+
+ /**************************************************************************
+ *
+ * Copyright 2012 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+*/
+
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+use euclid::{default::Transform2D, point2};
+use wpf_gpu_raster::{PathBuilder};
+
+
+use std::ops::Index;
+
+
+const WIDTH: u32 = 800;
+const HEIGHT: u32 = 800;
+
+
+fn over(src: u32, dst: u32) -> u32 {
+ let a = src >> 24;
+ let a = 255 - a;
+ let mask = 0xff00ff;
+ let t = (dst & mask) * a + 0x800080;
+ let mut rb = (t + ((t >> 8) & mask)) >> 8;
+ rb &= mask;
+
+ rb += src & mask;
+
+ // saturate
+ rb |= 0x1000100 - ((rb >> 8) & mask);
+ rb &= mask;
+
+ let t = ((dst >> 8) & mask) * a + 0x800080;
+ let mut ag = (t + ((t >> 8) & mask)) >> 8;
+ ag &= mask;
+ ag += (src >> 8) & mask;
+
+ // saturate
+ ag |= 0x1000100 - ((ag >> 8) & mask);
+ ag &= mask;
+
+ (ag << 8) + rb
+}
+
+pub fn alpha_mul(x: u32, a: u32) -> u32 {
+ let mask = 0xFF00FF;
+
+ let src_rb = ((x & mask) * a) >> 8;
+ let src_ag = ((x >> 8) & mask) * a;
+
+ (src_rb & mask) | (src_ag & !mask)
+}
+
+fn write_image(data: &[u32], path: &str) {
+ use std::path::Path;
+ use std::fs::File;
+ use std::io::BufWriter;
+
+ let mut png_data: Vec<u8> = vec![0; (WIDTH * HEIGHT * 3) as usize];
+ let mut i = 0;
+ for pixel in data {
+ png_data[i] = ((pixel >> 16) & 0xff) as u8;
+ png_data[i + 1] = ((pixel >> 8) & 0xff) as u8;
+ png_data[i + 2] = ((pixel >> 0) & 0xff) as u8;
+ i += 3;
+ }
+
+
+ let path = Path::new(path);
+ let file = File::create(path).unwrap();
+ let w = &mut BufWriter::new(file);
+
+ let mut encoder = png::Encoder::new(w, WIDTH, HEIGHT); // Width is 2 pixels and height is 1.
+ encoder.set_color(png::ColorType::Rgb);
+ encoder.set_depth(png::BitDepth::Eight);
+ let mut writer = encoder.write_header().unwrap();
+
+ writer.write_image_data(&png_data).unwrap(); // Save
+}
+
+#[derive(Debug)]
+struct Vertex {
+ x: f32,
+ y: f32,
+ coverage: f32
+}
+#[derive(Debug)]
+struct Triangle {
+ v: [Vertex; 3],
+}
+
+impl Index<usize> for Triangle {
+ type Output = Vertex;
+
+ fn index(&self, index: usize) -> &Self::Output {
+ &self.v[index]
+ }
+}
+
+// D3D11 mandates 8 bit subpixel precision:
+// https://microsoft.github.io/DirectX-Specs/d3d/archive/D3D11_3_FunctionalSpec.htm#CoordinateSnapping
+const FIXED_SHIFT: i32 = 8;
+const FIXED_ONE: f32 = (1 << FIXED_SHIFT) as f32;
+
+/* Proper rounding of float to integer */
+fn iround(mut v: f32) -> i64 {
+ if v > 0.0 {
+ v += 0.5;
+ }
+ if v < 0.0 {
+ v -= 0.5;
+ }
+ return v as i64
+}
+
+/* Based on http://devmaster.net/forums/topic/1145-advanced-rasterization */
+fn rast_triangle(buffer: &mut [u32], stride: usize, tri: &Triangle, color: u32) {
+ let center_offset = -0.5;
+
+ let mut coverage1 = tri[0].coverage;
+ let mut coverage2 = tri[1].coverage;
+ let mut coverage3 = tri[2].coverage;
+
+ /* fixed point coordinates */
+ let mut x1 = iround(FIXED_ONE * (tri[0].x + center_offset));
+ let x2 = iround(FIXED_ONE * (tri[1].x + center_offset));
+ let mut x3 = iround(FIXED_ONE * (tri[2].x + center_offset));
+
+ let mut y1 = iround(FIXED_ONE * (tri[0].y + center_offset));
+ let y2 = iround(FIXED_ONE * (tri[1].y + center_offset));
+ let mut y3 = iround(FIXED_ONE * (tri[2].y + center_offset));
+
+
+ /* Force correct vertex order */
+ let cross = (x2 - x1) * (y3 - y2) - (y2 - y1) * (x3 - x2);
+ if cross > 0 {
+ std::mem::swap(&mut x1, &mut x3);
+ std::mem::swap(&mut y1, &mut y3);
+ // I don't understand why coverage 2 and 3 are swapped instead of 1 and 3
+ std::mem::swap(&mut coverage2, &mut coverage3);
+ } else {
+ std::mem::swap(&mut coverage1, &mut coverage3);
+ }
+
+ /* Deltas */
+ let dx12 = x1 - x2;
+ let dx23 = x2 - x3;
+ let dx31 = x3 - x1;
+
+ let dy12 = y1 - y2;
+ let dy23 = y2 - y3;
+ let dy31 = y3 - y1;
+
+ /* Fixed-point deltas */
+ let fdx12 = dx12 << FIXED_SHIFT;
+ let fdx23 = dx23 << FIXED_SHIFT;
+ let fdx31 = dx31 << FIXED_SHIFT;
+
+ let fdy12 = dy12 << FIXED_SHIFT;
+ let fdy23 = dy23 << FIXED_SHIFT;
+ let fdy31 = dy31 << FIXED_SHIFT;
+
+ /* Bounding rectangle */
+ let mut minx = x1.min(x2).min(x3) >> FIXED_SHIFT;
+ let mut maxx = x1.max(x2).max(x3) >> FIXED_SHIFT;
+
+ let mut miny = y1.min(y2).min(y3) >> FIXED_SHIFT;
+ let mut maxy = y1.max(y2).max(y3) >> FIXED_SHIFT;
+
+ minx = minx.max(0);
+ maxx = maxx.min(WIDTH as i64 - 1);
+
+ miny = miny.max(0);
+ maxy = maxy.min(HEIGHT as i64 - 1);
+
+ /* Half-edge constants */
+ let mut c1 = dy12 * x1 - dx12 * y1;
+ let mut c2 = dy23 * x2 - dx23 * y2;
+ let mut c3 = dy31 * x3 - dx31 * y3;
+
+ /* Correct for top-left filling convention */
+ if dy12 < 0 || (dy12 == 0 && dx12 < 0) { c1 += 1 }
+ if dy23 < 0 || (dy23 == 0 && dx23 < 0) { c2 += 1 }
+ if dy31 < 0 || (dy31 == 0 && dx31 < 0) { c3 += 1 }
+
+ let mut cy1 = c1 + dx12 * (miny << FIXED_SHIFT) - dy12 * (minx << FIXED_SHIFT);
+ let mut cy2 = c2 + dx23 * (miny << FIXED_SHIFT) - dy23 * (minx << FIXED_SHIFT);
+ let mut cy3 = c3 + dx31 * (miny << FIXED_SHIFT) - dy31 * (minx << FIXED_SHIFT);
+
+ /* Perform rasterization */
+ let mut buffer = &mut buffer[miny as usize * stride..];
+ for _y in miny..=maxy {
+ let mut cx1 = cy1;
+ let mut cx2 = cy2;
+ let mut cx3 = cy3;
+
+ for x in minx..=maxx {
+ if cx1 > 0 && cx2 > 0 && cx3 > 0 {
+ // cross is equal to 2*area of the triangle.
+ // we can normalize cx by 2*area to get barycentric coords.
+ let area = cross.abs() as f32;
+ let bary = (cx1 as f32 / area, cx2 as f32/ area, cx3 as f32 / area);
+
+ let coverages = coverage1 * bary.0 + coverage2 * bary.1 + coverage3 * bary.2;
+
+ let color = alpha_mul(color, (coverages * 256. + 0.5) as u32);
+ buffer[x as usize] = over(color, buffer[x as usize]);
+ }
+
+ cx1 -= fdy12;
+ cx2 -= fdy23;
+ cx3 -= fdy31;
+ }
+
+ cy1 += fdx12;
+ cy2 += fdx23;
+ cy3 += fdx31;
+
+ buffer = &mut buffer[stride..];
+ }
+}
+
+
+fn main() {
+ let opt = usvg::Options::default();
+
+ let rtree = usvg::Tree::from_file("tiger.svg", &opt).unwrap();
+
+ let mut image = vec![0; (WIDTH * HEIGHT) as usize];
+ for _ in 0..1 {
+ let mut total_vertex_count = 0;
+ let mut total_time = std::time::Duration::default();
+ for node in rtree.root().descendants() {
+ use usvg::NodeExt;
+ let t = node.transform();
+ let transform = Transform2D::new(
+ t.a as f32, t.b as f32,
+ t.c as f32, t.d as f32,
+ t.e as f32, t.f as f32,
+ );
+
+
+ let s = 1.;
+ if let usvg::NodeKind::Path(ref usvg_path) = *node.borrow() {
+ let color = match usvg_path.fill {
+ Some(ref fill) => {
+ match fill.paint {
+ usvg::Paint::Color(c) => 0xff000000 | (c.red as u32) << 16 | (c.green as u32) << 8 | c.blue as u32,
+ _ => 0xff00ff00,
+ }
+ }
+ None => {
+ continue;
+ }
+ };
+ let mut builder = PathBuilder::new();
+ //dbg!(&usvg_path.segments);
+ for segment in &usvg_path.segments {
+ match *segment {
+ usvg::PathSegment::MoveTo { x, y } => {
+ let p = transform.transform_point(point2(x as f32, y as f32)) * s;
+ builder.move_to(p.x, p.y);
+ }
+ usvg::PathSegment::LineTo { x, y } => {
+ let p = transform.transform_point(point2(x as f32, y as f32)) * s;
+ builder.line_to(p.x, p.y);
+ }
+ usvg::PathSegment::CurveTo { x1, y1, x2, y2, x, y, } => {
+ let c1 = transform.transform_point(point2(x1 as f32, y1 as f32)) * s;
+ let c2 = transform.transform_point(point2(x2 as f32, y2 as f32)) * s;
+ let p = transform.transform_point(point2(x as f32, y as f32)) * s;
+ builder.curve_to(
+ c1.x, c1.y,
+ c2.x, c2.y,
+ p.x, p.y,
+ );
+ }
+ usvg::PathSegment::ClosePath => {
+ builder.close();
+ }
+ }
+ }
+ let start = std::time::Instant::now();
+ let result = builder.rasterize_to_tri_list(0, 0, WIDTH as i32, HEIGHT as i32);
+ let end = std::time::Instant::now();
+ total_time += end - start;
+
+ println!("vertices {}", result.len());
+ total_vertex_count += result.len();
+ if result.len() == 0 {
+ continue;
+ }
+
+ for n in (0..result.len()).step_by(3) {
+ let vertices = {
+ [&result[n], &result[n+1], &result[n+2]]
+ };
+
+ let src = color;
+ let tri = Triangle { v: [
+ Vertex { x: vertices[0].x, y: vertices[0].y, coverage: vertices[0].coverage},
+ Vertex { x: vertices[1].x, y: vertices[1].y, coverage: vertices[1].coverage},
+ Vertex { x: vertices[2].x, y: vertices[2].y, coverage: vertices[2].coverage}
+ ]
+ };
+ rast_triangle(&mut image, WIDTH as usize, &tri, src);
+ }
+ }
+ }
+
+ println!("total vertex count {}, took {}ms", total_vertex_count, total_time.as_secs_f32()*1000.);
+ }
+
+
+ write_image(&image, "out.png");
+ use std::{hash::{Hash, Hasher}, collections::hash_map::DefaultHasher};
+ use crate::*;
+ fn calculate_hash<T: Hash>(t: &T) -> u64 {
+ let mut s = DefaultHasher::new();
+ t.hash(&mut s);
+ s.finish()
+ }
+
+ assert_eq!(calculate_hash(&image),
+ if cfg!(debug_assertions) { 0x5973c52a1c0232f3 } else { 0xf15821a5bebc5ecf});
+
+
+}
diff --git a/third_party/rust/wpf-gpu-raster/examples/obj-output.rs b/third_party/rust/wpf-gpu-raster/examples/obj-output.rs
new file mode 100644
index 0000000000..c7ec8d7686
--- /dev/null
+++ b/third_party/rust/wpf-gpu-raster/examples/obj-output.rs
@@ -0,0 +1,26 @@
+// Output an .obj file of the generated mesh. Viewable at https://3dviewer.net/
+
+fn output_obj_file(data: &[OutputVertex]) {
+ for v in data {
+ let color = v.coverage;
+ println!("v {} {} {} {} {} {}", v.x, v.y, 0., color, color, color);
+ }
+
+ // output a standard triangle strip face list
+ for n in (1..data.len()-1).step_by(3) {
+ println!("f {} {} {}", n, n+1, n+2);
+ }
+}
+
+use wpf_gpu_raster::{PathBuilder, OutputVertex};
+fn main() {
+ let mut p = PathBuilder::new();
+ p.move_to(10., 10.0);
+ p.line_to(30., 10.);
+ p.line_to(50., 20.);
+ p.line_to(30., 30.);
+ p.line_to(10., 30.);
+ p.close();
+ let result = p.rasterize_to_tri_list(0, 0, 100, 100);
+ output_obj_file(&result)
+}
diff --git a/third_party/rust/wpf-gpu-raster/examples/simple.rs b/third_party/rust/wpf-gpu-raster/examples/simple.rs
new file mode 100644
index 0000000000..5b82cdd941
--- /dev/null
+++ b/third_party/rust/wpf-gpu-raster/examples/simple.rs
@@ -0,0 +1,11 @@
+use wpf_gpu_raster::PathBuilder;
+fn main() {
+ let mut p = PathBuilder::new();
+ p.move_to(10., 10.);
+ p.line_to(10., 30.);
+ p.line_to(30., 30.);
+ p.line_to(30., 10.);
+ p.close();
+ let _result = p.rasterize_to_tri_list(0, 0, 100, 100);
+ //dbg!(result);
+}
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