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[glium-examples] custom_textures: Do error handling

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The examples should be an example :)
This commit is contained in:
Malik Olivier Boussejra 2018-11-23 17:59:03 +09:00
parent 4314c27126
commit 16a3c2cc97
1 changed files with 19 additions and 10 deletions
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29
imgui-glium-examples/examples/custom_textures.rs
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@ -5,6 +5,7 @@ extern crate imgui_glium_renderer;
extern crate imgui_glutin_support;
use std::borrow::Cow;
use std::error::Error;
use std::io::Cursor;
use glium::{
@ -32,7 +33,11 @@ struct Lenna {
}
impl CustomTexturesApp {
fn register_textures<F>(&mut self, gl_ctx: &F, textures: &mut Textures)
fn register_textures<F>(
&mut self,
gl_ctx: &F,
textures: &mut Textures,
) -> Result<(), Box<dyn Error>>
where
F: Facade,
{
@ -57,15 +62,17 @@ impl CustomTexturesApp {
height: HEIGHT as u32,
format: ClientFormat::U8U8U8,
};
let gl_texture = Texture2d::new(gl_ctx, raw).expect("Create texture");
let gl_texture = Texture2d::new(gl_ctx, raw)?;
let texture_id = textures.insert(gl_texture);
self.my_texture_id = Some(texture_id);
}
if self.lenna.is_none() {
self.lenna = Some(Lenna::new(gl_ctx, textures));
self.lenna = Some(Lenna::new(gl_ctx, textures)?);
}
Ok(())
}
fn show_textures(&self, ui: &Ui) {
@ -85,7 +92,7 @@ impl CustomTexturesApp {
}
impl Lenna {
fn new<F>(gl_ctx: &F, textures: &mut Textures) -> Self
fn new<F>(gl_ctx: &F, textures: &mut Textures) -> Result<Self, Box<dyn Error>>
where
F: Facade,
{
@ -93,8 +100,8 @@ impl Lenna {
let byte_stream = Cursor::new(lenna_bytes.as_ref());
let mut decoder = JPEGDecoder::new(byte_stream);
let (width, height) = decoder.dimensions().expect("Could not read dimensions");
let image = decoder.read_image().expect("Could not read image");
let (width, height) = decoder.dimensions()?;
let image = decoder.read_image()?;
let raw = if let DecodingResult::U8(data) = &image {
RawImage2d {
data: Cow::Borrowed(data),
@ -105,12 +112,12 @@ impl Lenna {
} else {
unimplemented!("I only know how to deal with U8 data")
};
let gl_texture = Texture2d::new(gl_ctx, raw).expect("Could not create texture");
let gl_texture = Texture2d::new(gl_ctx, raw)?;
let texture_id = textures.insert(gl_texture);
Lenna {
Ok(Lenna {
texture_id,
size: (width as f32, height as f32),
}
})
}
fn show(&self, ui: &Ui) {
@ -125,7 +132,9 @@ fn main() {
"custom_textures.rs".to_owned(),
CLEAR_COLOR,
|ui, gl_ctx, textures| {
my_app.register_textures(gl_ctx, textures);
if let Err(e) = my_app.register_textures(gl_ctx, textures) {
panic!("Failed to register textures! {}", e);
}
my_app.show_textures(ui);
true