mirror of
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aa7f362f10
It is not longer in used for the abstraction between backend, we'll make a new trait for it later
667 lines
23 KiB
Rust
667 lines
23 KiB
Rust
/* LICENSE BEGIN
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This file is part of the SixtyFPS Project -- https://sixtyfps.io
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Copyright (c) 2020 Olivier Goffart <olivier.goffart@sixtyfps.io>
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Copyright (c) 2020 Simon Hausmann <simon.hausmann@sixtyfps.io>
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SPDX-License-Identifier: GPL-3.0-only
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This file is also available under commercial licensing terms.
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Please contact info@sixtyfps.io for more information.
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LICENSE END */
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#![warn(missing_docs)]
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/*!
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Graphics Abstractions.
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This module contains the abstractions and convenience types used for rendering.
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The run-time library also makes use of [RenderingCache] to store the rendering primitives
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created by the backend in a type-erased manner.
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*/
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extern crate alloc;
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use crate::properties::InterpolatedPropertyValue;
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#[cfg(feature = "rtti")]
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use crate::rtti::{BuiltinItem, FieldInfo, PropertyInfo, ValueType};
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use crate::{Callback, SharedString};
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use auto_enums::auto_enum;
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use const_field_offset::FieldOffsets;
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use sixtyfps_corelib_macros::*;
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/// 2D Rectangle
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pub type Rect = euclid::default::Rect<f32>;
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/// 2D Rectangle with integer coordinates
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pub type IntRect = euclid::default::Rect<i32>;
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/// 2D Point
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pub type Point = euclid::default::Point2D<f32>;
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/// 2D Size
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pub type Size = euclid::default::Size2D<f32>;
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/// RgbaColor stores the red, green, blue and alpha components of a color
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/// with the precision of the generic parameter T. For example if T is f32,
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/// the values are normalized between 0 and 1. If T is u8, they values range
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/// is 0 to 255.
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/// This is merely a helper class for use with [`Color`].
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#[derive(Copy, Clone, PartialEq, Debug, Default)]
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pub struct RgbaColor<T> {
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/// The alpha component.
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pub alpha: T,
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/// The red channel.
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pub red: T,
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/// The green channel.
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pub green: T,
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/// The blue channel.
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pub blue: T,
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}
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/// Color represents a color in the SixtyFPS run-time, represented using 8-bit channels for
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/// red, green, blue and the alpha (opacity).
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/// It can be conveniently constructed and destructured using the to_ and from_ (a)rgb helper functions:
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/// ```
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/// # fn do_something_with_red_and_green(_:f32, _:f32) {}
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/// # fn do_something_with_red(_:u8) {}
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/// # use sixtyfps_corelib::graphics::{Color, RgbaColor};
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/// # let some_color = Color::from_rgb_u8(0, 0, 0);
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/// let col = some_color.to_argb_f32();
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/// do_something_with_red_and_green(col.red, col.green);
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///
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/// let RgbaColor { red, blue, green, .. } = some_color.to_argb_u8();
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/// do_something_with_red(red);
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///
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/// let new_col = Color::from(RgbaColor{ red: 0.5, green: 0.65, blue: 0.32, alpha: 1.});
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/// ```
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#[derive(Copy, Clone, PartialEq, Debug, Default)]
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#[repr(C)]
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pub struct Color {
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red: u8,
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green: u8,
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blue: u8,
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alpha: u8,
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}
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impl From<RgbaColor<u8>> for Color {
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fn from(col: RgbaColor<u8>) -> Self {
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Self { red: col.red, green: col.green, blue: col.blue, alpha: col.alpha }
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}
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}
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impl From<Color> for RgbaColor<u8> {
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fn from(col: Color) -> Self {
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RgbaColor { red: col.red, green: col.green, blue: col.blue, alpha: col.alpha }
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}
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}
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impl From<RgbaColor<u8>> for RgbaColor<f32> {
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fn from(col: RgbaColor<u8>) -> Self {
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Self {
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red: (col.red as f32) / 255.0,
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green: (col.green as f32) / 255.0,
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blue: (col.blue as f32) / 255.0,
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alpha: (col.alpha as f32) / 255.0,
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}
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}
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}
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impl From<Color> for RgbaColor<f32> {
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fn from(col: Color) -> Self {
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let u8col: RgbaColor<u8> = col.into();
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u8col.into()
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}
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}
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impl From<RgbaColor<f32>> for Color {
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fn from(col: RgbaColor<f32>) -> Self {
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Self {
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red: (col.red * 255.) as u8,
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green: (col.green * 255.) as u8,
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blue: (col.blue * 255.) as u8,
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alpha: (col.alpha * 255.) as u8,
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}
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}
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}
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impl Color {
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/// Construct a color from an integer encoded as `0xAARRGGBB`
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pub const fn from_argb_encoded(encoded: u32) -> Color {
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Self {
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red: (encoded >> 16) as u8,
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green: (encoded >> 8) as u8,
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blue: encoded as u8,
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alpha: (encoded >> 24) as u8,
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}
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}
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/// Returns `(alpha, red, green, blue)` encoded as u32
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pub fn as_argb_encoded(&self) -> u32 {
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((self.red as u32) << 16)
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| ((self.green as u32) << 8)
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| (self.blue as u32)
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| ((self.alpha as u32) << 24)
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}
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/// Construct a color from the alpha, red, green and blue color channel parameters.
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pub fn from_argb_u8(alpha: u8, red: u8, green: u8, blue: u8) -> Self {
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Self { red, green, blue, alpha }
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}
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/// Construct a color from the red, green and blue color channel parameters. The alpha
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/// channel will have the value 255.
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pub fn from_rgb_u8(red: u8, green: u8, blue: u8) -> Self {
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Self::from_argb_u8(255, red, green, blue)
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}
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/// Construct a color from the alpha, red, green and blue color channel parameters.
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pub fn from_argb_f32(alpha: f32, red: f32, green: f32, blue: f32) -> Self {
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RgbaColor { alpha, red, green, blue }.into()
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}
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/// Construct a color from the red, green and blue color channel parameters. The alpha
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/// channel will have the value 255.
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pub fn from_rgb_f32(red: f32, green: f32, blue: f32) -> Self {
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Self::from_argb_f32(1.0, red, green, blue)
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}
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/// Converts this color to an RgbaColor struct for easy destructuring.
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pub fn to_argb_u8(&self) -> RgbaColor<u8> {
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RgbaColor::from(*self)
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}
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/// Converts this color to an RgbaColor struct for easy destructuring.
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pub fn to_argb_f32(&self) -> RgbaColor<f32> {
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RgbaColor::from(*self)
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}
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/// Returns the red channel of the color as u8 in the range 0..255.
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pub fn red(self) -> u8 {
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self.red
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}
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/// Returns the green channel of the color as u8 in the range 0..255.
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pub fn green(self) -> u8 {
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self.green
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}
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/// Returns the blue channel of the color as u8 in the range 0..255.
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pub fn blue(self) -> u8 {
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self.blue
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}
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/// Returns the alpha channel of the color as u8 in the range 0..255.
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pub fn alpha(self) -> u8 {
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self.alpha
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}
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}
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impl InterpolatedPropertyValue for Color {
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fn interpolate(self, target_value: Self, t: f32) -> Self {
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Self {
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red: self.red.interpolate(target_value.red, t),
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green: self.green.interpolate(target_value.green, t),
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blue: self.blue.interpolate(target_value.blue, t),
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alpha: self.alpha.interpolate(target_value.alpha, t),
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}
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}
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}
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impl std::fmt::Display for Color {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "argb({}, {}, {}, {})", self.alpha, self.red, self.green, self.blue)
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}
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}
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#[cfg(feature = "femtovg_backend")]
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impl From<&Color> for femtovg::Color {
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fn from(col: &Color) -> Self {
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Self::rgba(col.red, col.green, col.blue, col.alpha)
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}
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}
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#[cfg(feature = "femtovg_backend")]
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impl From<Color> for femtovg::Color {
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fn from(col: Color) -> Self {
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Self::rgba(col.red, col.green, col.blue, col.alpha)
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}
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}
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/// A resource is a reference to binary data, for example images. They can be accessible on the file
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/// system or embedded in the resulting binary. Or they might be URLs to a web server and a downloaded
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/// is necessary before they can be used.
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#[derive(Clone, PartialEq, Debug)]
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#[repr(u8)]
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pub enum Resource {
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/// A resource that does not represent any data.
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None,
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/// A resource that points to a file in the file system
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AbsoluteFilePath(crate::SharedString),
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/// A resource that is embedded in the program and accessible via pointer
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/// The format is the same as in a file
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EmbeddedData(super::slice::Slice<'static, u8>),
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/// Raw ARGB
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#[allow(missing_docs)]
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EmbeddedRgbaImage { width: u32, height: u32, data: super::sharedvector::SharedVector<u32> },
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}
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impl Default for Resource {
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fn default() -> Self {
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Resource::None
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}
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}
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/// CachedGraphicsData allows the graphics backend to store an arbitrary piece of data associated with
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/// an item, which is typically computed by accessing properties. The dependency_tracker is used to allow
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/// for a lazy computation. Typically backends store either compute intensive data or handles that refer to
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/// data that's stored in GPU memory.
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pub struct CachedGraphicsData<T> {
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/// The backend specific data.
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pub data: T,
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/// The property tracker that should be used to evaluate whether the primitive needs to be re-created
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/// or not.
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pub dependency_tracker: core::pin::Pin<Box<crate::properties::PropertyTracker>>,
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}
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impl<T> CachedGraphicsData<T> {
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/// Creates a new TrackingRenderingPrimitive by evaluating the provided update_fn once, storing the returned
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/// rendering primitive and initializing the dependency tracker.
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pub fn new(update_fn: impl FnOnce() -> T) -> Self {
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let dependency_tracker = Box::pin(crate::properties::PropertyTracker::default());
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let data = dependency_tracker.as_ref().evaluate(update_fn);
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Self { data, dependency_tracker }
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}
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}
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/// The RenderingCache, in combination with CachedGraphicsData, allows backends to store data that's either
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/// intensive to compute or has bad CPU locality. Backends typically keep a RenderingCache instance and use
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/// the item's cached_rendering_data() integer as index in the vec_arena::Arena.
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pub type RenderingCache<T> = vec_arena::Arena<CachedGraphicsData<T>>;
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/// FontRequest collects all the developer-configurable properties for fonts, such as family, weight, etc.
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/// It is submitted as a request to the platform font system (i.e. CoreText on macOS) and in exchange the
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/// backend returns a Box<dyn Font>.
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#[derive(Debug, Clone, PartialEq)]
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#[repr(C)]
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pub struct FontRequest {
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/// The name of the font family to be used, such as "Helvetica". An empty family name means the system
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/// default font family should be used.
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pub family: SharedString,
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/// If the weight is None, the the system default font weight should be used.
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pub weight: Option<i32>,
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/// If the pixel size is None, the system default font size should be used.
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pub pixel_size: Option<f32>,
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}
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/// The FontMetrics trait is constructed from a FontRequest by the graphics backend and supplied to text related
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/// items in order to measure text.
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pub trait FontMetrics {
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/// Returns the width of the given string in physical pixels.
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fn text_width(&self, text: &str) -> f32;
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/// Returns the (UTF-8) byte offset in the given text that refers to the character that contributed to
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/// the glyph cluster that's visually nearest to the given x coordinate. This is used for hit-testing,
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/// for example when receiving a mouse click into a text field. Then this function returns the "cursor"
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/// position.
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fn text_offset_for_x_position<'a>(&self, text: &'a str, x: f32) -> usize;
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/// Returns the height of the font. This is typically the sum of the ascent and the descent, resulting
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/// in the height that can fit the talltest glyphs of the font. Note that it is possible though that
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/// the font may include glyphs that exceed this.
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fn height(&self) -> f32;
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}
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#[repr(C)]
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#[derive(FieldOffsets, Default, SixtyFPSElement, Clone, Debug, PartialEq)]
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#[pin]
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/// PathLineTo describes the event of moving the cursor on the path to the specified location
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/// along a straight line.
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pub struct PathLineTo {
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#[rtti_field]
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/// The x coordinate where the line should go to.
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pub x: f32,
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#[rtti_field]
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/// The y coordinate where the line should go to.
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pub y: f32,
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}
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#[repr(C)]
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#[derive(FieldOffsets, Default, SixtyFPSElement, Clone, Debug, PartialEq)]
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#[pin]
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/// PathArcTo describes the event of moving the cursor on the path across an arc to the specified
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/// x/y coordinates, with the specified x/y radius and additional properties.
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pub struct PathArcTo {
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#[rtti_field]
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/// The x coordinate where the arc should end up.
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pub x: f32,
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#[rtti_field]
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/// The y coordinate where the arc should end up.
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pub y: f32,
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#[rtti_field]
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/// The radius on the x-axis of the arc.
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pub radius_x: f32,
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#[rtti_field]
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/// The radius on the y-axis of the arc.
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pub radius_y: f32,
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#[rtti_field]
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/// The rotation along the x-axis of the arc in degress.
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pub x_rotation: f32,
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#[rtti_field]
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/// large_arc indicates whether to take the long or the shorter path to complete the arc.
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pub large_arc: bool,
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#[rtti_field]
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/// sweep indicates the direction of the arc. If true, a clockwise direction is chosen,
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/// otherwise counter-clockwise.
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pub sweep: bool,
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}
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#[repr(C)]
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#[derive(Clone, Debug, PartialEq)]
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/// PathElement describes a single element on a path, such as move-to, line-to, etc.
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pub enum PathElement {
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/// The LineTo variant describes a line.
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LineTo(PathLineTo),
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/// The PathArcTo variant describes an arc.
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ArcTo(PathArcTo),
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/// Indicates that the path should be closed now by connecting to the starting point.
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Close,
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}
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#[repr(C)]
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#[derive(Clone, Debug, PartialEq)]
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/// PathEvent is a low-level data structure describing the composition of a path. Typically it is
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/// generated at compile time from a higher-level description, such as SVG commands.
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pub enum PathEvent {
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/// The beginning of the path.
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Begin,
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/// A straight line on the path.
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Line,
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/// A quadratic bezier curve on the path.
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Quadratic,
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/// A cubic bezier curve on the path.
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Cubic,
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/// The end of the path that remains open.
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EndOpen,
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/// The end of a path that is closed.
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EndClosed,
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}
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struct ToLyonPathEventIterator<'a> {
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events_it: std::slice::Iter<'a, PathEvent>,
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coordinates_it: std::slice::Iter<'a, Point>,
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first: Option<&'a Point>,
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last: Option<&'a Point>,
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}
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impl<'a> Iterator for ToLyonPathEventIterator<'a> {
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type Item = lyon::path::Event<lyon::math::Point, lyon::math::Point>;
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fn next(&mut self) -> Option<Self::Item> {
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use lyon::path::Event;
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self.events_it.next().map(|event| match event {
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PathEvent::Begin => Event::Begin { at: self.coordinates_it.next().unwrap().clone() },
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PathEvent::Line => Event::Line {
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from: self.coordinates_it.next().unwrap().clone(),
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to: self.coordinates_it.next().unwrap().clone(),
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},
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PathEvent::Quadratic => Event::Quadratic {
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from: self.coordinates_it.next().unwrap().clone(),
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ctrl: self.coordinates_it.next().unwrap().clone(),
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to: self.coordinates_it.next().unwrap().clone(),
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},
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PathEvent::Cubic => Event::Cubic {
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from: self.coordinates_it.next().unwrap().clone(),
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ctrl1: self.coordinates_it.next().unwrap().clone(),
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ctrl2: self.coordinates_it.next().unwrap().clone(),
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to: self.coordinates_it.next().unwrap().clone(),
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},
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PathEvent::EndOpen => Event::End {
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first: self.first.unwrap().clone(),
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last: self.last.unwrap().clone(),
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close: false,
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},
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PathEvent::EndClosed => Event::End {
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first: self.first.unwrap().clone(),
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last: self.last.unwrap().clone(),
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close: true,
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},
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})
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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self.events_it.size_hint()
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}
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}
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impl<'a> ExactSizeIterator for ToLyonPathEventIterator<'a> {}
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struct TransformedLyonPathIterator<EventIt> {
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it: EventIt,
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transform: lyon::math::Transform,
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}
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impl<EventIt: Iterator<Item = lyon::path::Event<lyon::math::Point, lyon::math::Point>>> Iterator
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for TransformedLyonPathIterator<EventIt>
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{
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type Item = lyon::path::Event<lyon::math::Point, lyon::math::Point>;
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fn next(&mut self) -> Option<Self::Item> {
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self.it.next().map(|ev| ev.transformed(&self.transform))
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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self.it.size_hint()
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}
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}
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impl<EventIt: Iterator<Item = lyon::path::Event<lyon::math::Point, lyon::math::Point>>>
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ExactSizeIterator for TransformedLyonPathIterator<EventIt>
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{
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}
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/// PathDataIterator is a data structure that acts as starting point for iterating
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/// through the low-level events of a path. If the path was constructed from said
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/// events, then it is a very thin abstraction. If the path was created from higher-level
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/// elements, then an intermediate lyon path is required/built.
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pub struct PathDataIterator<'a> {
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it: LyonPathIteratorVariant<'a>,
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transform: Option<lyon::math::Transform>,
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}
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enum LyonPathIteratorVariant<'a> {
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FromPath(lyon::path::Path),
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|
FromEvents(&'a crate::SharedVector<PathEvent>, &'a crate::SharedVector<Point>),
|
|
}
|
|
|
|
impl<'a> PathDataIterator<'a> {
|
|
/// Create a new iterator for path traversal.
|
|
#[auto_enum(Iterator)]
|
|
pub fn iter(
|
|
&'a self,
|
|
) -> impl Iterator<Item = lyon::path::Event<lyon::math::Point, lyon::math::Point>> + 'a {
|
|
match &self.it {
|
|
LyonPathIteratorVariant::FromPath(path) => self.apply_transform(path.iter()),
|
|
LyonPathIteratorVariant::FromEvents(events, coordinates) => {
|
|
self.apply_transform(ToLyonPathEventIterator {
|
|
events_it: events.iter(),
|
|
coordinates_it: coordinates.iter(),
|
|
first: coordinates.first(),
|
|
last: coordinates.last(),
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
fn fit(&mut self, width: f32, height: f32) {
|
|
if width > 0. || height > 0. {
|
|
let br = lyon::algorithms::aabb::bounding_rect(self.iter());
|
|
self.transform = Some(lyon::algorithms::fit::fit_rectangle(
|
|
&br,
|
|
&Rect::from_size(Size::new(width, height)),
|
|
lyon::algorithms::fit::FitStyle::Min,
|
|
));
|
|
}
|
|
}
|
|
#[auto_enum(Iterator)]
|
|
fn apply_transform(
|
|
&'a self,
|
|
event_it: impl Iterator<Item = lyon::path::Event<lyon::math::Point, lyon::math::Point>> + 'a,
|
|
) -> impl Iterator<Item = lyon::path::Event<lyon::math::Point, lyon::math::Point>> + 'a {
|
|
match self.transform {
|
|
Some(transform) => TransformedLyonPathIterator { it: event_it, transform },
|
|
None => event_it,
|
|
}
|
|
}
|
|
}
|
|
|
|
#[repr(C)]
|
|
#[derive(Clone, Debug, PartialEq)]
|
|
/// PathData represents a path described by either high-level elements or low-level
|
|
/// events and coordinates.
|
|
pub enum PathData {
|
|
/// None is the variant when the path is empty.
|
|
None,
|
|
/// The Elements variant is used to make a Path from shared arrays of elements.
|
|
Elements(crate::SharedVector<PathElement>),
|
|
/// The Events variant describes the path as a series of low-level events and
|
|
/// associated coordinates.
|
|
Events(crate::SharedVector<PathEvent>, crate::SharedVector<Point>),
|
|
}
|
|
|
|
impl Default for PathData {
|
|
fn default() -> Self {
|
|
Self::None
|
|
}
|
|
}
|
|
|
|
impl PathData {
|
|
/// This function returns an iterator that allows traversing the path by means of lyon events.
|
|
pub fn iter(&self) -> PathDataIterator {
|
|
PathDataIterator {
|
|
it: match self {
|
|
PathData::None => LyonPathIteratorVariant::FromPath(lyon::path::Path::new()),
|
|
PathData::Elements(elements) => LyonPathIteratorVariant::FromPath(
|
|
PathData::build_path(elements.as_slice().iter()),
|
|
),
|
|
PathData::Events(events, coordinates) => {
|
|
LyonPathIteratorVariant::FromEvents(events, coordinates)
|
|
}
|
|
},
|
|
transform: None,
|
|
}
|
|
}
|
|
|
|
/// This function returns an iterator that allows traversing the path by means of lyon events.
|
|
pub fn iter_fitted(&self, width: f32, height: f32) -> PathDataIterator {
|
|
let mut it = self.iter();
|
|
it.fit(width, height);
|
|
it
|
|
}
|
|
|
|
fn build_path(element_it: std::slice::Iter<PathElement>) -> lyon::path::Path {
|
|
use lyon::geom::SvgArc;
|
|
use lyon::math::{Angle, Point, Vector};
|
|
use lyon::path::{
|
|
builder::{Build, FlatPathBuilder, SvgBuilder},
|
|
ArcFlags,
|
|
};
|
|
|
|
let mut path_builder = lyon::path::Path::builder().with_svg();
|
|
for element in element_it {
|
|
match element {
|
|
PathElement::LineTo(PathLineTo { x, y }) => {
|
|
path_builder.line_to(Point::new(*x, *y))
|
|
}
|
|
PathElement::ArcTo(PathArcTo {
|
|
x,
|
|
y,
|
|
radius_x,
|
|
radius_y,
|
|
x_rotation,
|
|
large_arc,
|
|
sweep,
|
|
}) => {
|
|
let radii = Vector::new(*radius_x, *radius_y);
|
|
let x_rotation = Angle::degrees(*x_rotation);
|
|
let flags = ArcFlags { large_arc: *large_arc, sweep: *sweep };
|
|
let to = Point::new(*x, *y);
|
|
|
|
let svg_arc = SvgArc {
|
|
from: path_builder.current_position(),
|
|
radii,
|
|
x_rotation,
|
|
flags,
|
|
to,
|
|
};
|
|
|
|
if svg_arc.is_straight_line() {
|
|
path_builder.line_to(to);
|
|
} else {
|
|
path_builder.arc_to(radii, x_rotation, flags, to)
|
|
}
|
|
}
|
|
PathElement::Close => path_builder.close(),
|
|
}
|
|
}
|
|
|
|
path_builder.build()
|
|
}
|
|
}
|
|
|
|
pub(crate) mod ffi {
|
|
#![allow(unsafe_code)]
|
|
|
|
use super::*;
|
|
|
|
#[allow(non_camel_case_types)]
|
|
type c_void = ();
|
|
|
|
/// Expand Rect so that cbindgen can see it. ( is in fact euclid::default::Rect<f32>)
|
|
#[cfg(cbindgen)]
|
|
#[repr(C)]
|
|
struct Rect {
|
|
x: f32,
|
|
y: f32,
|
|
width: f32,
|
|
height: f32,
|
|
}
|
|
|
|
/// Expand IntRect so that cbindgen can see it. ( is in fact euclid::default::Rect<i32>)
|
|
#[cfg(cbindgen)]
|
|
#[repr(C)]
|
|
struct IntRect {
|
|
x: i32,
|
|
y: i32,
|
|
width: i32,
|
|
height: i32,
|
|
}
|
|
|
|
/// Expand Point so that cbindgen can see it. ( is in fact euclid::default::PointD2<f32>)
|
|
#[cfg(cbindgen)]
|
|
#[repr(C)]
|
|
struct Point {
|
|
x: f32,
|
|
y: f32,
|
|
}
|
|
|
|
#[no_mangle]
|
|
/// This function is used for the low-level C++ interface to allocate the backing vector for a shared path element array.
|
|
pub unsafe extern "C" fn sixtyfps_new_path_elements(
|
|
out: *mut c_void,
|
|
first_element: *const PathElement,
|
|
count: usize,
|
|
) {
|
|
let arr = crate::SharedVector::from(std::slice::from_raw_parts(first_element, count));
|
|
core::ptr::write(out as *mut crate::SharedVector<PathElement>, arr.clone());
|
|
}
|
|
|
|
#[no_mangle]
|
|
/// This function is used for the low-level C++ interface to allocate the backing vector for a shared path event array.
|
|
pub unsafe extern "C" fn sixtyfps_new_path_events(
|
|
out_events: *mut c_void,
|
|
out_coordinates: *mut c_void,
|
|
first_event: *const PathEvent,
|
|
event_count: usize,
|
|
first_coordinate: *const Point,
|
|
coordinate_count: usize,
|
|
) {
|
|
let events =
|
|
crate::SharedVector::from(std::slice::from_raw_parts(first_event, event_count));
|
|
core::ptr::write(out_events as *mut crate::SharedVector<PathEvent>, events.clone());
|
|
let coordinates = crate::SharedVector::from(std::slice::from_raw_parts(
|
|
first_coordinate,
|
|
coordinate_count,
|
|
));
|
|
core::ptr::write(out_coordinates as *mut crate::SharedVector<Point>, coordinates.clone());
|
|
}
|
|
}
|