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use crate::generic::device::{Device, RenderTarget};
use crate::generic::texture_font::Font;
use crate::units::{PixelToUvTransform, PixelTransform};
use crate::Fonts;
use crate::{
display_list::StrokeStyle,
generic::{clipping::Scissor, path::FlattenedPath, texture_font::FontParams},
BasicCompositeOperation, CompositeOperation, LineJoin, PathElement, Primitive,
};
use drawing_api::*;
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>(
&mut self,
render_target: &D::RenderTarget,
primitives: &[Primitive<D::Texture, Fonts<D>>],
antialiasing: bool,
) -> Result<(), &'static str> {
let mut device = render_target.get_device();
self.draw_internal::<D>(
&mut device,
render_target,
primitives,
antialiasing,
PixelTransform::identity(),
Scissor::empty(),
)
}
fn draw_internal<D: Device>(
&mut self,
device: &mut D,
render_target: &D::RenderTarget,
primitives: &[Primitive<D::Texture, Fonts<D>>],
antialiasing: bool,
pixel_transform: PixelTransform,
scissor: Scissor,
) -> Result<(), &'static str> {
let pixel_to_device_transform = pixel_transform.then(&render_target.get_device_transform());
for primitive in primitives {
match primitive {
Primitive::Clear { color } => {
device.clear(render_target, color);
}
Primitive::Line {
color,
thickness,
start_point,
end_point,
} => {
let thickness = pixel_to_device_transform
.transform_point(PixelPoint::new(*thickness, *thickness))
.x;
device.line(
render_target,
color,
thickness,
*start_point,
*end_point,
pixel_to_device_transform,
);
}
Primitive::Rectangle { color, rect } => {
device.rect_colored(render_target, color, *rect, pixel_to_device_transform)
}
Primitive::Image { texture, rect, src } => {
let pixel_to_uv_transform = Self::get_uv_transform(texture.get_descriptor());
device.rect_textured(
render_target,
&texture,
false,
&[1.0f32, 1.0f32, 1.0f32, 1.0f32],
*rect,
*src,
pixel_to_device_transform,
pixel_to_uv_transform,
);
}
Primitive::Text {
fonts,
family_name,
color,
position,
clipping_rect,
size,
text,
} => {
if let Some(font) = fonts.data.lock().unwrap().fonts.get_mut(family_name) {
font.draw(
device,
render_target,
color,
text,
*position,
*clipping_rect,
FontParams { size: *size as u8 },
pixel_to_device_transform,
)?;
}
}
Primitive::Stroke {
path,
thickness,
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) = crate::generic::device::Paint::from_brush(brush);
device.stroke(
render_target,
&paint,
texture.as_ref(),
true,
&flattened_path.paths,
stroke_width,
1.0f32 / aspect_ratio,
antialiasing,
scissor,
CompositeOperation::Basic(BasicCompositeOperation::SrcOver).into(),
pixel_to_device_transform,
);
}
Primitive::StrokeStyled {
path,
thickness,
brush,
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) = crate::generic::device::Paint::from_brush(brush);
device.stroke(
render_target,
&paint,
texture.as_ref(),
true,
&flattened_path.paths,
stroke_width,
1.0f32 / aspect_ratio,
antialiasing,
scissor,
CompositeOperation::Basic(BasicCompositeOperation::SrcOver).into(),
pixel_to_device_transform,
);
}
Primitive::Fill { path, brush } => {
let aspect_ratio = render_target.get_aspect_ratio();
let flattened_path = Self::get_fill_path(path, aspect_ratio, antialiasing);
let (paint, texture) = crate::generic::device::Paint::from_brush(brush);
device.fill(
render_target,
&paint,
texture.as_ref(),
true,
&flattened_path.paths,
flattened_path.bounds,
1.0f32 / aspect_ratio,
antialiasing,
scissor,
CompositeOperation::Basic(BasicCompositeOperation::SrcOver).into(),
pixel_to_device_transform,
);
}
Primitive::ClipRect { rect, primitives } => {
self.draw_internal(
device,
render_target,
primitives,
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 {
transform,
primitives,
} => {
self.draw_internal(
device,
render_target,
primitives,
antialiasing,
transform.then(&pixel_transform),
scissor.apply_transform(transform),
)?;
}
Primitive::Composite { color, 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(&texture2_view, primitives, antialiasing)?;
let pixel_to_uv_transform = Self::get_uv_transform(texture2.get_descriptor());
device.rect_textured(
render_target,
&texture2,
false,
color,
PixelRect::new(
PixelPoint::new(0.0f32, 0.0f32),
PixelSize::new(size.0 as f32, size.1 as f32),
),
PixelRect::new(
PixelPoint::new(0.0f32, 0.0f32),
PixelSize::new(size.0 as f32, size.1 as f32),
),
pixel_to_device_transform,
pixel_to_uv_transform,
);
}
}
}
Ok(())
}
fn get_stroke_path(
path: &[PathElement],
stroke_width: f32,
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 * 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 * 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
}
fn get_uv_transform(descriptor: drawing_api::TextureDescriptor) -> PixelToUvTransform {
PixelToUvTransform::identity().then_scale(
1.0f32 / descriptor.width as f32,
1.0f32 / descriptor.height as f32,
)
}
}