xlui 0.2.2

Rust GUI库
Documentation 
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use crate::{Device, Size};
use crate::render::image::ImageSource;

pub struct ImageTexture {
    size: Size,
    bind_group: wgpu::BindGroup,
}

impl ImageTexture {
    pub fn new(device: &Device, source: &ImageSource, layout: &wgpu::BindGroupLayout) -> ImageTexture {
        let (rgba, size) = match source {
            ImageSource::File(fp) => super::load_image_file(fp).unwrap(),
            ImageSource::Bytes(bytes) => super::load_image_bytes(bytes).unwrap(),
        };
        let bind_group = Self::create_bind_group(device, rgba, size, layout);
        ImageTexture {
            bind_group,
            size,
        }
    }

    fn create_bind_group(device: &Device, rgba: Vec<u8>, size: Size, group_layout: &wgpu::BindGroupLayout) -> wgpu::BindGroup {
        let size = wgpu::Extent3d {
            width: size.width,
            height: size.height,
            depth_or_array_layers: 1,
        };
        let texture = device.device.create_texture(&wgpu::TextureDescriptor {
            label: None,
            size,
            mip_level_count: 1,
            sample_count: 1,
            dimension: wgpu::TextureDimension::D2,
            format: wgpu::TextureFormat::Rgba8UnormSrgb,
            usage: wgpu::TextureUsages::TEXTURE_BINDING | wgpu::TextureUsages::COPY_DST,
            view_formats: &[],
        });
        let copy_texture = wgpu::TexelCopyTextureInfo {
            texture: &texture,
            mip_level: 0,
            origin: wgpu::Origin3d::ZERO,
            aspect: wgpu::TextureAspect::All,
        };
        let copy_buffer_layout = wgpu::TexelCopyBufferLayout {
            offset: 0,
            bytes_per_row: Some(4 * size.width),
            rows_per_image: Some(size.height),
        };
        device.queue.write_texture(copy_texture, &rgba, copy_buffer_layout, size);
        let texture_view = texture.create_view(&wgpu::TextureViewDescriptor::default());
        let sampler = device.device.create_sampler(&wgpu::SamplerDescriptor {
            address_mode_u: wgpu::AddressMode::ClampToEdge,
            address_mode_v: wgpu::AddressMode::ClampToEdge,
            address_mode_w: wgpu::AddressMode::ClampToEdge,
            mag_filter: wgpu::FilterMode::Linear,
            min_filter: wgpu::FilterMode::Linear,
            mipmap_filter: wgpu::FilterMode::Linear,
            ..Default::default()
        });

        let bind_group = device.device.create_bind_group(&wgpu::BindGroupDescriptor {
            layout: &group_layout,
            entries: &[
                wgpu::BindGroupEntry {
                    binding: 0,
                    resource: wgpu::BindingResource::TextureView(&texture_view),
                },
                wgpu::BindGroupEntry {
                    binding: 1,
                    resource: wgpu::BindingResource::Sampler(&sampler),
                },
            ],
            label: None,
        });
        bind_group
    }

    pub fn size(&self) -> Size {
        self.size
    }

    pub fn bind_group(&self) -> &wgpu::BindGroup {
        &self.bind_group
    }
}