drawing_gl 0.8.0

OpenGL backend for 2D graphics library
Documentation 
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use crate::{generic::device::Device, units::PixelToDeviceTransform};
use drawing_api::*;

#[derive(PartialEq, Eq, Hash, Copy, Clone)]
pub struct FontParams {
    pub size: u8,
}

pub trait Font<D: Device> {
    /// Safe to call from any thread for any device type (even for OpenGL).
    /// To achieve it the device specific resources creation (like texture)
    /// is delayed to the first draw() call.
    fn create(bytes: Vec<u8>) -> Result<Self, &'static str>
    where
        Self: Sized;

    /// Safe to call from any thread for any device type (even for OpenGL).
    /// To achieve it the device specific resources creation (like texture)
    /// is delayed to the first draw() call.
    fn get_dimensions(
        &mut self,
        params: FontParams,
        text: &str,
    ) -> Result<(u16, u16), &'static str>;

    /// Safe to call from any thread for any device type (even for OpenGL).
    /// To achieve it the device specific resources creation (like texture)
    /// is delayed to the first draw() call.
    fn get_dimensions_each_char(
        &mut self,
        params: FontParams,
        text: &str,
    ) -> Result<(Vec<i16>, u16), &'static str>;

    // Not safe to call from any thread for some device types (like OpenGL).
    fn draw(
        &mut self,
        device: &mut D,
        target: &D::RenderTarget,
        color: &crate::generic::device::Color,
        text: &str,
        pos: PixelPoint,
        clipping_rect: Option<PixelRect>,
        font_params: FontParams,
        transform: PixelToDeviceTransform,
    ) -> Result<(), &'static str>;
}