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use std::path::Path;
use std::rc::Rc;
use image;
use crate::error::{Result, TetraError};
use crate::graphics::opengl::{GLTexture, TextureFormat};
use crate::graphics::{self, DrawParams, Drawable, Rectangle};
use crate::Context;
#[derive(Debug, Clone, PartialEq)]
pub struct Texture {
pub(crate) handle: Rc<GLTexture>,
}
impl Texture {
pub fn new<P>(ctx: &mut Context, path: P) -> Result<Texture>
where
P: AsRef<Path>,
{
let image = image::open(path)?.to_rgba();
let (width, height) = image.dimensions();
Texture::from_rgba(
ctx,
width as i32,
height as i32,
image.into_raw().as_slice(),
)
}
pub fn from_file_data(ctx: &mut Context, data: &[u8]) -> Result<Texture> {
let image = image::load_from_memory(data)?.to_rgba();
let (width, height) = image.dimensions();
Texture::from_rgba(
ctx,
width as i32,
height as i32,
image.into_raw().as_slice(),
)
}
pub fn from_rgba(ctx: &mut Context, width: i32, height: i32, data: &[u8]) -> Result<Texture> {
let expected = (width * height * 4) as usize;
let actual = data.len();
if expected > actual {
return Err(TetraError::NotEnoughData { expected, actual });
}
let texture = ctx.gl.new_texture(width, height, TextureFormat::Rgba);
ctx.gl
.set_texture_data(&texture, &data, 0, 0, width, height, TextureFormat::Rgba);
Ok(Texture::from_handle(texture))
}
#[deprecated(
since = "0.2.13",
note = "Renamed to `from_file_data` to disambiguate from other image data formats (e.g. RGBA)."
)]
#[allow(missing_docs)]
#[inline]
pub fn from_data(ctx: &mut Context, data: &[u8]) -> Result<Texture> {
Texture::from_file_data(ctx, data)
}
pub(crate) fn from_handle(handle: GLTexture) -> Texture {
Texture {
handle: Rc::new(handle),
}
}
pub fn width(&self) -> i32 {
self.handle.width()
}
pub fn height(&self) -> i32 {
self.handle.height()
}
}
impl Drawable for Texture {
fn draw<P>(&self, ctx: &mut Context, params: P)
where
P: Into<DrawParams>,
{
let params = params.into();
let texture_width = self.width() as f32;
let texture_height = self.height() as f32;
let clip = params
.clip
.unwrap_or_else(|| Rectangle::new(0.0, 0.0, texture_width, texture_height));
let x1 = 0.0;
let y1 = 0.0;
let x2 = clip.width;
let y2 = clip.height;
let u1 = clip.x / texture_width;
let v1 = clip.y / texture_height;
let u2 = (clip.x + clip.width) / texture_width;
let v2 = (clip.y + clip.height) / texture_height;
graphics::set_texture(ctx, self);
graphics::push_quad(ctx, x1, y1, x2, y2, u1, v1, u2, v2, ¶ms);
}
}