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use crate::backend::Device;
use crate::backend::RenderTarget;
use crate::clipping::Scissor;
use crate::font::Font;
use crate::font::FontParams;
use crate::paint::Paint;
use crate::path::FlattenedPath;
use crate::primitive::*;
use crate::resources::*;
use crate::units::*;
use anyhow::Result;
use std::convert::Into;
pub struct Renderer;
impl Default for Renderer {
fn default() -> Self {
Self::new()
}
}
impl Renderer {
pub fn new() -> Self {
Renderer {}
}
pub fn draw<D: Device, F: Font<D>>(
&mut self,
device: &mut D,
render_target: &D::RenderTarget,
primitives: &[Primitive],
resources: &mut Resources<D, F>,
antialiasing: bool,
) -> Result<()> {
self.draw_internal(
device,
render_target,
primitives,
resources,
antialiasing,
PixelTransform::identity(),
Scissor::empty(),
)
}
fn draw_internal<D: Device, F: Font<D>>(
&mut self,
device: &mut D,
render_target: &D::RenderTarget,
primitives: &[Primitive],
resources: &mut Resources<D, F>,
antialiasing: bool,
pixel_transform: PixelTransform,
scissor: Scissor,
) -> Result<()> {
let pixel_to_device_transform = pixel_transform.then(&render_target.get_device_transform());
let unknown_to_device_transform =
UnknownToDeviceTransform::from_array(pixel_to_device_transform.to_array());
for primitive in primitives {
match *primitive {
Primitive::Line {
ref color,
thickness,
start_point,
end_point,
} => {
let thickness = pixel_to_device_transform
.transform_point(PixelPoint::new(thickness.get(), thickness.get()))
.x;
device.line(
render_target,
color,
DeviceThickness::new(thickness),
start_point.to_untyped(),
end_point.to_untyped(),
unknown_to_device_transform,
);
}
Primitive::Rectangle { ref color, rect } => device.rect_colored(
render_target,
color,
rect.to_untyped(),
unknown_to_device_transform,
),
Primitive::Image {
resource_key,
rect,
uv,
} => {
if let Some(texture) = resources.textures_mut().get(&resource_key) {
device.rect_textured(
render_target,
texture,
false,
&[1.0f32, 1.0f32, 1.0f32, 1.0f32],
rect.to_untyped(),
&uv,
unknown_to_device_transform,
);
}
}
Primitive::Text {
ref resource_key,
ref color,
position,
clipping_rect,
size,
ref text,
} => {
if let Some(font) = resources.fonts_mut().get_mut(resource_key) {
font.draw(
device,
render_target,
color,
text,
position.to_untyped(),
clipping_rect.to_untyped(),
FontParams {
size: size.get() as u8,
},
unknown_to_device_transform,
)?;
}
}
Primitive::Stroke {
ref path,
ref thickness,
ref brush,
} => {
let scale = 1.0f32; // TODO: take from transform? xform.average_scale()?
let stroke_width = *thickness * scale; //.clamped(0.0, 200.0);
let aspect_ratio = render_target.get_aspect_ratio();
let flattened_path = Self::get_stroke_path(
path,
stroke_width,
&Default::default(),
aspect_ratio,
antialiasing,
);
let (paint, texture) = Paint::from_brush(brush, resources);
device.stroke(
render_target,
&paint,
texture,
true,
&flattened_path.paths,
stroke_width.get(),
1.0f32 / aspect_ratio,
antialiasing,
scissor,
CompositeOperation::Basic(BasicCompositeOperation::SrcOver).into(),
unknown_to_device_transform,
);
}
Primitive::StrokeStyled {
ref path,
ref thickness,
ref brush,
ref style,
} => {
let scale = 1.0f32; // TODO: take from transform? xform.average_scale()?
let stroke_width = *thickness * scale; //.clamped(0.0, 200.0);
let aspect_ratio = render_target.get_aspect_ratio();
let flattened_path = Self::get_stroke_path(
path,
stroke_width,
style,
aspect_ratio,
antialiasing,
);
let (paint, texture) = Paint::from_brush(brush, resources);
device.stroke(
render_target,
&paint,
texture,
true,
&flattened_path.paths,
stroke_width.get(),
1.0f32 / aspect_ratio,
antialiasing,
scissor,
CompositeOperation::Basic(BasicCompositeOperation::SrcOver).into(),
unknown_to_device_transform,
);
}
Primitive::Fill {
ref path,
ref brush,
} => {
let aspect_ratio = render_target.get_aspect_ratio();
let flattened_path = Self::get_fill_path(path, aspect_ratio, antialiasing);
let (paint, texture) = Paint::from_brush(brush, resources);
device.fill(
render_target,
&paint,
texture,
true,
&flattened_path.paths,
flattened_path.bounds,
1.0f32 / aspect_ratio,
antialiasing,
scissor,
CompositeOperation::Basic(BasicCompositeOperation::SrcOver).into(),
unknown_to_device_transform,
);
}
Primitive::ClipRect {
ref rect,
ref primitives,
} => {
self.draw_internal(
device,
render_target,
primitives,
resources,
antialiasing,
pixel_transform,
scissor.intersect_with_rect(*rect, &pixel_transform),
)?;
}
Primitive::ClipPath { .. } => {
/*device.save_state();
device.set_clip_path(path);
self.draw(device, render_target, primitives, resources, antialiasing)?;
device.restore_state();*/
}
Primitive::Transform {
ref transform,
ref primitives,
} => {
self.draw_internal(
device,
render_target,
primitives,
resources,
antialiasing,
transform.then(&pixel_transform),
scissor.apply_transform(transform),
)?;
}
Primitive::Composite {
ref color,
ref primitives,
} => {
let size = render_target.get_size();
let (texture2, texture2_view) =
device.create_render_target(size.0 as u16, size.1 as u16)?;
device.clear(&texture2_view, &[0.0f32, 0.0f32, 0.0f32, 0.0f32]);
self.draw(device, &texture2_view, primitives, resources, antialiasing)?;
device.rect_textured(
render_target,
&texture2,
false,
color,
Rect::new(
Point::new(0.0f32, 0.0f32),
Size::new(size.0 as f32, size.1 as f32),
),
&[0.0, 0.0, 1.0, 1.0],
unknown_to_device_transform,
);
}
}
}
Ok(())
}
fn get_stroke_path(
path: &[PathElement],
stroke_width: PixelThickness,
stroke_style: &StrokeStyle,
aspect_ratio: f32,
antialiasing: bool,
) -> FlattenedPath {
let mut flattened_path =
FlattenedPath::new(path, 0.01f32 / aspect_ratio, 0.25f32 / aspect_ratio);
let fringe_width = 1.0f32 / aspect_ratio;
if antialiasing {
flattened_path.expand_stroke(
stroke_width.get() * 0.5f32,
fringe_width,
stroke_style.line_cap,
stroke_style.line_join,
stroke_style.miter_limit,
0.25f32 / aspect_ratio,
);
} else {
flattened_path.expand_stroke(
stroke_width.get() * 0.5f32,
0.0,
stroke_style.line_cap,
stroke_style.line_join,
stroke_style.miter_limit,
0.25f32 / aspect_ratio,
);
}
flattened_path
}
fn get_fill_path(path: &[PathElement], aspect_ratio: f32, antialiasing: bool) -> FlattenedPath {
let mut flattened_path =
FlattenedPath::new(path, 0.01f32 / aspect_ratio, 0.25f32 / aspect_ratio);
let fringe_width = 1.0f32 / aspect_ratio;
if antialiasing {
flattened_path.expand_fill(fringe_width, LineJoin::Miter, 2.4f32, fringe_width);
} else {
flattened_path.expand_fill(0.0f32, LineJoin::Miter, 2.4f32, fringe_width);
}
flattened_path
}
}