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use crate::context::Context;
use super::atlas::*;
use super::*;
#[derive(Default)]
pub struct Entry {
allocated: bool,
/// X coordinate of the image in an atlas.
x: u16,
/// Y coordinate of the image in an atlas.
y: u16,
/// Width of the image.
width: u16,
/// Height of the image.
height: u16,
}
pub struct Atlas {
alloc: AtlasAllocator,
buffer: Vec<u8>,
fresh: bool,
dirty: bool,
}
pub struct ImageCache {
pub entries: Vec<Entry>,
atlas: Atlas,
max_texture_size: u16,
texture: wgpu::Texture,
pub texture_view: wgpu::TextureView,
}
#[inline]
pub fn buffer_size(width: u32, height: u32) -> Option<usize> {
(width as usize)
.checked_add(height as usize)?
.checked_add(4)
}
pub const SIZE: u16 = 2048;
impl ImageCache {
/// Creates a new image cache.
pub fn new(context: &Context) -> Self {
let device = &context.device;
// let max_texture_size = max_texture_size.clamp(1024, 8192);
let max_texture_size = SIZE;
let texture = device.create_texture(&wgpu::TextureDescriptor {
label: Some("rich_text create texture"),
size: wgpu::Extent3d {
width: SIZE as u32,
height: SIZE as u32,
depth_or_array_layers: 1,
},
view_formats: &[],
dimension: wgpu::TextureDimension::D2,
format: wgpu::TextureFormat::Rgba8Unorm,
usage: wgpu::TextureUsages::COPY_DST | wgpu::TextureUsages::TEXTURE_BINDING,
mip_level_count: 1,
sample_count: 1,
});
let texture_view = texture.create_view(&wgpu::TextureViewDescriptor::default());
let alloc = AtlasAllocator::new(max_texture_size, max_texture_size);
Self {
entries: Vec::new(),
atlas: Atlas {
alloc,
buffer: vec![
0u8;
max_texture_size as usize * max_texture_size as usize * 4
],
fresh: true,
dirty: true,
},
max_texture_size,
texture_view,
texture,
}
}
/// Allocates a new image and optionally fills it with the specified data.
pub fn allocate(&mut self, request: AddImage) -> Option<ImageId> {
let width = request.width;
let height = request.height;
// Check buffer size
buffer_size(width as u32, height as u32)?;
// Too big to allocate
if !(width <= self.max_texture_size && height <= (self.max_texture_size / 4)) {
return None;
}
let atlas_data = self.atlas.alloc.allocate(width, height);
// if atlas_data.is_none() {
// return None;
// Grow atlas to fit
// self.max_texture_size += SIZE;
// self.atlas.fresh = true;
// self.atlas.dirty = true;
// self.entries.clear();
// println!("{:?}", self.max_texture_size);
// self.atlas.alloc = AtlasAllocator::new(self.max_texture_size, self.max_texture_size);
// self.atlas.buffer = vec![
// 0u8;
// self.max_texture_size as usize * self.max_texture_size as usize * 4
// ];
// atlas_data = self.atlas.alloc.allocate(width, height);
// println!("{:?}", atlas_data);
// if self.max_texture_size > MAX_SIZE {
// println!("should try to grow or reset atlas");
// }
// }
let (x, y) = atlas_data?;
let entry_index = self.entries.len();
self.entries.push(Entry {
allocated: true,
x,
y,
width,
height,
});
if let Some(data) = request.data() {
fill(
x,
y,
width,
height,
data,
self.max_texture_size,
&mut self.atlas.buffer,
);
self.atlas.dirty = true;
}
ImageId::new(entry_index as u32, request.has_alpha)
}
// Evaluate if does make sense to deallocate from atlas and if yes, which case?
// considering that a terminal uses a short/limited of glyphs compared to a wide text editor
// if deallocate an image then is necessary to cleanup cache of draw_layout fn
/// Deallocates the specified image.
#[allow(unused)]
pub fn deallocate(&mut self, image: ImageId) -> Option<()> {
let entry = self.entries.get_mut(image.index())?;
if !entry.allocated {
return None;
}
self.atlas.alloc.deallocate(entry.x, entry.y, entry.width);
entry.allocated = false;
Some(())
}
/// Retrieves the image for the specified handle and updates the epoch.
pub fn get(&self, handle: &ImageId) -> Option<ImageLocation> {
let entry = self.entries.get(handle.index())?;
if !entry.allocated {
return None;
}
let s = 1. / self.max_texture_size as f32;
Some(ImageLocation {
min: (entry.x as f32 * s, entry.y as f32 * s),
max: (
(entry.x + entry.width) as f32 * s,
(entry.y + entry.height) as f32 * s,
),
})
}
/// Returns true if the image is valid.
pub fn is_valid(&self, image: ImageId) -> bool {
if let Some(entry) = self.entries.get(image.index()) {
entry.allocated
} else {
false
}
}
/// Updates an image with the specified data.
// pub fn update(&mut self, handle: ImageId, data: &[u8]) -> Option<()> {
// let entry = self.entries.get_mut(handle.index())?;
// if entry.flags & ENTRY_ALLOCATED == 0 {
// return None;
// }
// let atlas = self.atlases.get_mut(entry.owner as usize)?;
// fill(
// entry.x,
// entry.y,
// entry.width,
// entry.height,
// data,
// ATLAS_DIM,
// &mut atlas.buffer,
// 4,
// );
// atlas.dirty = true;
// Some(())
// }
#[inline]
pub fn process_atlases(&mut self, context: &mut Context) {
if !self.atlas.dirty {
return;
}
if self.atlas.fresh {
let texture_size = wgpu::Extent3d {
width: (self.max_texture_size).into(),
height: (self.max_texture_size).into(),
depth_or_array_layers: 1,
};
let new_texture = context.device.create_texture(&wgpu::TextureDescriptor {
size: texture_size,
mip_level_count: 1,
sample_count: 1,
dimension: wgpu::TextureDimension::D2,
format: wgpu::TextureFormat::Rgba8Unorm,
usage: wgpu::TextureUsages::TEXTURE_BINDING
| wgpu::TextureUsages::COPY_DST,
label: Some("rich_text::fresh atlas"),
view_formats: &[],
});
context.queue.write_texture(
// Tells wgpu where to copy the pixel data
wgpu::TexelCopyTextureInfo {
texture: &new_texture,
mip_level: 0,
origin: wgpu::Origin3d::ZERO,
aspect: wgpu::TextureAspect::All,
},
// The actual pixel data
&self.atlas.buffer,
// The layout of the texture
wgpu::TexelCopyBufferLayout {
offset: 0,
bytes_per_row: Some((self.max_texture_size * 4).into()),
rows_per_image: Some((self.max_texture_size).into()),
},
texture_size,
);
self.texture = new_texture;
self.texture_view = self
.texture
.create_view(&wgpu::TextureViewDescriptor::default());
} else {
let texture_size = wgpu::Extent3d {
width: (self.max_texture_size).into(),
height: (self.max_texture_size).into(),
depth_or_array_layers: 1,
};
context.queue.write_texture(
// Tells wgpu where to copy the pixel data
wgpu::TexelCopyTextureInfo {
texture: &self.texture,
mip_level: 0,
origin: wgpu::Origin3d { x: 0, y: 0, z: 0 },
aspect: wgpu::TextureAspect::All,
},
// The actual pixel data
&self.atlas.buffer,
// The layout of the texture
wgpu::TexelCopyBufferLayout {
offset: 0,
bytes_per_row: Some((self.max_texture_size * 4).into()),
rows_per_image: Some((self.max_texture_size).into()),
},
texture_size,
);
}
self.atlas.fresh = false;
self.atlas.dirty = false;
}
}
fn fill(
x: u16,
y: u16,
width: u16,
_height: u16,
image: &[u8],
target_width: u16,
target: &mut [u8],
) -> Option<()> {
let channels = 4;
let image_pitch = width as usize * channels;
let buffer_pitch = target_width as usize * channels;
let mut offset = y as usize * buffer_pitch + x as usize * channels;
for row in image.chunks(image_pitch) {
let dest = target.get_mut(offset..offset + image_pitch)?;
dest.copy_from_slice(row);
offset += buffer_pitch;
}
Some(())
}