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// file based on https://github.com/sunli829/nvg
// released on MIT license
// which was translated from https://github.com/memononen/nanovg (zlib license)
use crate::backend::Device;
use crate::backend::Texture;
use crate::color::Color;
use crate::font::Font;
use crate::primitive::Brush;
use crate::resources::Resources;
use crate::units::PixelRect;
use crate::units::PixelTransform;
#[derive(Debug, Copy, Clone)]
pub struct Paint {
pub xform: PixelTransform,
pub extent: [f32; 2],
pub radius: f32,
pub feather: f32,
pub inner_color: Color,
pub outer_color: Color,
pub image: Option<i32>,
}
impl Paint {
pub fn from_brush<'a, D: Device, F: Font<D>>(
brush: &Brush,
resources: &'a mut Resources<D, F>,
) -> (Self, Option<&'a D::Texture>) {
match brush {
Brush::Color { ref color } => (
Paint {
xform: PixelTransform::identity(),
extent: [0.0, 0.0],
radius: 0.0,
feather: 1.0,
inner_color: *color,
outer_color: *color,
image: None,
},
None,
),
Brush::LinearGradient {
start_point,
end_point,
inner_color,
outer_color,
} => {
const LARGE: f32 = 1e5;
let mut dx = end_point.x - start_point.x;
let mut dy = end_point.y - start_point.y;
let d = (dx * dx + dy * dy).sqrt();
if d > 0.0001 {
dx /= d;
dy /= d;
} else {
dx = 0.0;
dy = 1.0;
}
(
Paint {
xform: PixelTransform::new(
dy,
-dx,
dx,
dy,
start_point.x - dx * LARGE,
start_point.y - dy * LARGE,
),
extent: [LARGE, LARGE + d * 0.5],
radius: 0.0,
feather: d.max(1.0),
inner_color: *inner_color,
outer_color: *outer_color,
image: None,
},
None,
)
}
Brush::RadialGradient {
center_point,
in_radius,
out_radius,
inner_color,
outer_color,
} => {
let r = (in_radius + out_radius) * 0.5;
let f = out_radius - in_radius;
(
Paint {
xform: PixelTransform::new(
1.0,
0.0,
0.0,
1.0,
center_point.x,
center_point.y,
),
extent: [r, r],
radius: r,
feather: f.max(1.0),
inner_color: *inner_color,
outer_color: *outer_color,
image: None,
},
None,
)
}
Brush::ShadowGradient {
rect,
radius,
feather,
inner_color,
outer_color,
} => {
let PixelRect { origin, size } = rect;
(
Paint {
xform: PixelTransform::new(
1.0,
0.0,
0.0,
1.0,
origin.x + size.width * 0.5,
origin.y + size.height * 0.5,
),
extent: [size.width * 0.5, size.height * 0.5],
radius: *radius,
feather: feather.max(1.0),
inner_color: *inner_color,
outer_color: *outer_color,
image: None,
},
None,
)
}
Brush::ImagePattern {
resource_key,
transform,
alpha,
} => {
let texture = resources.textures_mut().get(resource_key);
let extent_size = if let Some(texture) = texture {
let size = texture.get_size();
[size.0 as f32, size.1 as f32]
} else {
[1.0f32, 1.0f32]
};
(
Paint {
xform: *transform,
extent: extent_size,
radius: 0.0,
feather: 0.0,
inner_color: [1.0, 1.0, 1.0, *alpha],
outer_color: [1.0, 1.0, 1.0, *alpha],
image: Some(*resource_key),
},
texture,
)
}
}
}
}