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https://github.com/italicsjenga/vello.git
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dbe7f27768
This exposes significantly more of the previously internal encoding guts. This is beneficial for its own sake as there always seem to be new and interesting things that are supported by the encoding and GPU pipeline that are not directly exposed by the scene builder. The secondary purpose is laying the groundwork for scene *de*coding and processing. This will enable us to implement various stages of the pipeline on the CPU.
90 lines
2.7 KiB
Rust
90 lines
2.7 KiB
Rust
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Also licensed under MIT license, at your choice.
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use std::ops::Mul;
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use bytemuck::{Pod, Zeroable};
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use peniko::kurbo;
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/// Affine transformation matrix.
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#[derive(Copy, Clone, PartialEq, Pod, Zeroable)]
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#[repr(C)]
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pub struct Transform {
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/// 2x2 matrix.
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pub matrix: [f32; 4],
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/// Translation.
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pub translation: [f32; 2],
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}
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impl Transform {
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/// Identity transform.
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pub const IDENTITY: Self = Self {
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matrix: [1.0, 0.0, 0.0, 1.0],
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translation: [0.0; 2],
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};
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/// Creates a transform from a kurbo affine matrix.
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pub fn from_kurbo(transform: &kurbo::Affine) -> Self {
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let c = transform.as_coeffs().map(|x| x as f32);
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Self {
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matrix: [c[0], c[1], c[2], c[3]],
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translation: [c[4], c[5]],
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}
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}
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/// Converts the transform to a kurbo affine matrix.
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pub fn to_kurbo(&self) -> kurbo::Affine {
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kurbo::Affine::new(
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[
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self.matrix[0],
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self.matrix[1],
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self.matrix[2],
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self.matrix[3],
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self.translation[0],
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self.translation[1],
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]
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.map(|x| x as f64),
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)
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}
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}
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impl Mul for Transform {
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type Output = Self;
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#[inline]
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fn mul(self, other: Self) -> Self {
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Self {
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matrix: [
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self.matrix[0] * other.matrix[0] + self.matrix[2] * other.matrix[1],
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self.matrix[1] * other.matrix[0] + self.matrix[3] * other.matrix[1],
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self.matrix[0] * other.matrix[2] + self.matrix[2] * other.matrix[3],
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self.matrix[1] * other.matrix[2] + self.matrix[3] * other.matrix[3],
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],
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translation: [
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self.matrix[0] * other.translation[0]
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+ self.matrix[2] * other.translation[1]
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+ self.translation[0],
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self.matrix[1] * other.translation[0]
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+ self.matrix[3] * other.translation[1]
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+ self.translation[1],
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],
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}
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}
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}
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pub fn point_to_f32(point: kurbo::Point) -> [f32; 2] {
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[point.x as f32, point.y as f32]
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}
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