rust_widgets 0.9.6

Pure Rust cross-platform native GUI library with hardware-adaptive rendering, 60+ widgets, touch/gesture support, i18n, and SVG-pipeline-accurate output
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180

//! Optional WGPU-based GPU renderer backend.
//!
//! Enable with Cargo feature: `gpu-wgpu`.
mod commands;
mod raster;
mod renderer;
pub mod shaders;
mod types;
pub use commands::WgpuDrawCommand;
pub use renderer::WgpuRenderer;
pub use types::{PixelRect, Rgba8};
#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn command_raster_draw_text_honors_clipping() {
        let pixels = raster::rasterize_draw_commands_rgba8(
            16,
            16,
            &[
                commands::WgpuDrawCommand::Clear { color: types::Rgba8 { r: 0, g: 0, b: 0, a: 0 } },
                commands::WgpuDrawCommand::DrawText {
                    rect: types::PixelRect { x: 0, y: 0, width: 16, height: 16 },
                    text: "AB".to_string(),
                    color: types::Rgba8 { r: 220, g: 10, b: 40, a: 255 },
                    clip: Some(types::PixelRect { x: 0, y: 0, width: 8, height: 16 }),
                },
            ],
        )
        .expect("text raster should succeed");
        let mut painted_left = 0usize;
        let mut painted_right = 0usize;
        for y in 0..16u32 {
            for x in 0..16u32 {
                let offset = ((y * 16 + x) * 4) as usize;
                let alpha = pixels[offset + 3];
                if alpha == 0 {
                    continue;
                }
                if x < 8 {
                    painted_left += 1;
                } else {
                    painted_right += 1;
                }
            }
        }
        assert!(painted_left > 0);
        assert_eq!(painted_right, 0);
    }
    #[test]
    fn command_raster_draw_image_scales_with_deterministic_sampling() {
        let source = vec![255, 0, 0, 255, 0, 255, 0, 255, 0, 0, 255, 255, 255, 255, 255, 255];
        let pixels = raster::rasterize_draw_commands_rgba8(
            4,
            4,
            &[commands::WgpuDrawCommand::DrawImage {
                rect: types::PixelRect { x: 0, y: 0, width: 4, height: 4 },
                rgba8: source,
                image_width: 2,
                image_height: 2,
                clip: None,
            }],
        )
        .expect("image raster should succeed");
        let sample = |x: u32, y: u32| -> [u8; 4] {
            let offset = ((y * 4 + x) * 4) as usize;
            [pixels[offset], pixels[offset + 1], pixels[offset + 2], pixels[offset + 3]]
        };
        assert_eq!(sample(0, 0), [255, 0, 0, 255]);
        assert_eq!(sample(3, 0), [0, 255, 0, 255]);
        assert_eq!(sample(0, 3), [0, 0, 255, 255]);
        assert_eq!(sample(3, 3), [255, 255, 255, 255]);
    }
    #[test]
    fn command_raster_draw_image_invalid_payload_is_explicit_error() {
        let error = raster::rasterize_draw_commands_rgba8(
            4,
            4,
            &[commands::WgpuDrawCommand::DrawImage {
                rect: types::PixelRect { x: 0, y: 0, width: 4, height: 4 },
                rgba8: vec![0; 12],
                image_width: 2,
                image_height: 2,
                clip: None,
            }],
        )
        .expect_err("invalid payload should fail");
        assert!(error.contains("invalid DrawImage payload"));
    }
    #[test]
    fn test_render_clear_gpu_produces_valid_pixels() {
        // This test only runs on systems with a GPU
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let pixels = renderer.render_clear_gpu(64, 64, [1.0, 0.0, 0.0, 1.0]).unwrap();
            assert_eq!(pixels.len(), 64 * 64 * 4);
            // All pixels should be red (255, 0, 0, 255)
            assert_eq!(pixels[0], 255);
            assert_eq!(pixels[1], 0);
            assert_eq!(pixels[2], 0);
            assert_eq!(pixels[3], 255);
        }
    }
    #[test]
    fn test_render_fill_rect_gpu_produces_colored_rects() {
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let pixels = renderer
                .render_fill_rect_gpu(
                    16,
                    16,
                    &[(0, 0, 8, 8, [1.0, 0.0, 0.0, 1.0]), (8, 8, 8, 8, [0.0, 1.0, 0.0, 1.0])],
                )
                .unwrap();
            assert_eq!(pixels.len(), 16 * 16 * 4);
            // Top-left quarter should be red
            assert_eq!(pixels[0], 255, "(0,0) should be red");
            assert_eq!(pixels[1], 0, "(0,0) G should be 0");
            assert_eq!(pixels[2], 0, "(0,0) B should be 0");
            assert_eq!(pixels[3], 255, "(0,0) A should be 255");
            // Bottom-right quarter should be green
            let g_off = ((12 * 16 + 12) * 4) as usize;
            assert_eq!(pixels[g_off], 0, "(12,12) R should be 0");
            assert_eq!(pixels[g_off + 1], 255, "(12,12) should be green");
            // Gap between rects should be transparent
            let t_off = (12 * 4) as usize;
            assert_eq!(pixels[t_off + 3], 0, "gap should be transparent");
        }
    }
    #[test]
    fn test_render_fill_rect_gpu_empty_returns_transparent() {
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let pixels = renderer.render_fill_rect_gpu(8, 8, &[]).unwrap();
            assert_eq!(pixels.len(), 8 * 8 * 4);
            assert!(pixels.iter().all(|&b| b == 0), "empty rects should produce all-zero pixels");
        }
    }
    #[test]
    fn test_render_stroke_rect_gpu_produces_outline() {
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let rects = &[((6, 6, 4, 4, 1), [1.0, 0.0, 0.0, 1.0])]; // red stroke
            let pixels = renderer.render_stroke_rect_gpu(16, 16, rects).unwrap();
            assert_eq!(pixels.len(), 16 * 16 * 4);
        }
    }
    #[test]
    fn test_render_stroke_rect_gpu_empty_returns_frame() {
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let pixels = renderer.render_stroke_rect_gpu(8, 8, &[]).unwrap();
            assert_eq!(pixels.len(), 8 * 8 * 4);
        }
    }
    #[test]
    fn test_render_draw_line_gpu_produces_pixels() {
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let lines = &[((2, 2, 14, 14, 2), [0.0, 1.0, 0.0, 1.0])]; // green diagonal
            let pixels = renderer.render_draw_line_gpu(16, 16, lines).unwrap();
            assert_eq!(pixels.len(), 16 * 16 * 4);
        }
    }
    #[test]
    fn test_render_fill_circle_gpu_produces_circle() {
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let pixels = renderer
                .render_fill_circle_gpu(32, 32, &[((16, 16, 8), [1.0, 0.0, 0.0, 1.0])])
                .unwrap();
            assert_eq!(pixels.len(), 32 * 32 * 4);
            // Center pixel should be red
            let center_idx = (16 * 32 + 16) * 4;
            assert_eq!(pixels[center_idx], 255); // R
            assert_eq!(pixels[center_idx + 1], 0); // G
            assert_eq!(pixels[center_idx + 2], 0); // B
        }
    }
    #[test]
    fn test_render_fill_circle_gpu_empty_returns_frame() {
        if let Ok(renderer) = super::WgpuRenderer::new() {
            let pixels = renderer.render_fill_circle_gpu(8, 8, &[]).unwrap();
            assert_eq!(pixels.len(), 8 * 8 * 4);
        }
    }
}