zng_view/image_cache.rs
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use std::{fmt, mem, sync::Arc};
use image::ImageDecoder;
use webrender::api::{ImageDescriptor, ImageDescriptorFlags, ImageFormat};
use winit::{
event_loop::ActiveEventLoop,
window::{CustomCursor, Icon},
};
use zng_txt::{formatx, ToTxt, Txt};
use zng_unit::{Px, PxPoint, PxSize};
use zng_view_api::{
image::{ImageDataFormat, ImageDownscale, ImageId, ImageLoadedData, ImageMaskMode, ImagePpi, ImageRequest},
ipc::{IpcBytes, IpcBytesReceiver},
Event,
};
use crate::{AppEvent, AppEventSender};
use rustc_hash::FxHashMap;
pub(crate) const ENCODERS: &[&str] = &[
"png",
"jpg",
"jpeg",
"webp",
#[cfg(any(feature = "avif", zng_view_image_has_avif))]
"avif",
"gif",
"ico",
"bmp",
"jfif",
"exr",
"hdr",
"pnm",
"qoi",
"ff",
"farbfeld",
];
pub(crate) const DECODERS: &[&str] = &[
"png",
"jpg",
"jpeg",
"webp",
#[cfg(any(feature = "avif", zng_view_image_has_avif))]
"avif",
"gif",
"ico",
"bmp",
"jfif",
"exr",
"pnm",
"qoi",
"ff",
"farbfeld",
"dds",
];
/// Decode and cache image resources.
pub(crate) struct ImageCache {
app_sender: AppEventSender,
images: FxHashMap<ImageId, Image>,
image_id_gen: ImageId,
}
impl ImageCache {
pub fn new(app_sender: AppEventSender) -> Self {
Self {
app_sender,
images: FxHashMap::default(),
image_id_gen: ImageId::first(),
}
}
pub fn add(
&mut self,
ImageRequest {
format,
data,
max_decoded_len,
downscale,
mask,
}: ImageRequest<IpcBytes>,
) -> ImageId {
let id = self.image_id_gen.incr();
let app_sender = self.app_sender.clone();
rayon::spawn(move || {
let r = match format {
ImageDataFormat::Bgra8 { size, ppi } => {
let expected_len = size.width.0 as usize * size.height.0 as usize * 4;
if data.len() != expected_len {
Err(formatx!(
"pixels.len() is not width * height * 4, expected {expected_len}, found {}",
data.len()
))
} else if mask.is_some() {
let (pixels, size, _, is_opaque, _) = Self::convert_decoded(
image::DynamicImage::ImageLuma8(
image::ImageBuffer::from_raw(size.width.0 as _, size.height.0 as _, data.to_vec()).unwrap(),
),
mask,
);
Ok((pixels, size, ppi, is_opaque, true))
} else {
let is_opaque = data.chunks_exact(4).all(|c| c[3] == 255);
Ok((data, size, ppi, is_opaque, false))
}
}
ImageDataFormat::A8 { size } => {
let expected_len = size.width.0 as usize * size.height.0 as usize;
if data.len() != expected_len {
Err(formatx!(
"pixels.len() is not width * height, expected {expected_len}, found {}",
data.len()
))
} else if mask.is_none() {
let (pixels, size, _, is_opaque, _) = Self::convert_decoded(
image::DynamicImage::ImageLuma8(
image::ImageBuffer::from_raw(size.width.0 as _, size.height.0 as _, data.to_vec()).unwrap(),
),
None,
);
Ok((pixels, size, None, is_opaque, false))
} else {
let is_opaque = data.iter().all(|&c| c == 255);
Ok((data, size, None, is_opaque, true))
}
}
fmt => match Self::get_format_and_size(&fmt, &data[..]) {
Ok((fmt, mut size, orientation)) => {
let decoded_len = size.width.0 as u64 * size.height.0 as u64 * 4;
if decoded_len > max_decoded_len {
Err(formatx!(
"image {size:?} needs to allocate {decoded_len} bytes, but max allowed size is {max_decoded_len} bytes",
))
} else {
if let Some(d) = downscale {
size = d.resize_dimensions(size);
}
let _ = app_sender.send(AppEvent::Notify(Event::ImageMetadataLoaded {
image: id,
size,
ppi: None,
is_mask: false,
}));
match Self::image_decode(&data[..], fmt, downscale, orientation) {
Ok(img) => Ok(Self::convert_decoded(img, mask)),
Err(e) => Err(e.to_txt()),
}
}
}
Err(e) => Err(e),
},
};
match r {
Ok((pixels, size, ppi, is_opaque, is_mask)) => {
let _ = app_sender.send(AppEvent::ImageLoaded(ImageLoadedData {
id,
pixels,
size,
ppi,
is_opaque,
is_mask,
}));
}
Err(e) => {
let _ = app_sender.send(AppEvent::Notify(Event::ImageLoadError { image: id, error: e }));
}
}
});
id
}
pub fn add_pro(
&mut self,
ImageRequest {
format,
data,
max_decoded_len,
downscale,
mask,
}: ImageRequest<IpcBytesReceiver>,
) -> ImageId {
let id = self.image_id_gen.incr();
let app_sender = self.app_sender.clone();
rayon::spawn(move || {
// crate `images` does not do progressive decode.
let mut full = vec![];
let mut size = None;
let mut ppi = None;
let mut is_encoded = true;
let mut orientation = image::metadata::Orientation::NoTransforms;
let mut format = match format {
ImageDataFormat::Bgra8 { size: s, ppi: p } => {
is_encoded = false;
size = Some(s);
ppi = p;
None
}
ImageDataFormat::A8 { size: s } => {
is_encoded = false;
size = Some(s);
None
}
ImageDataFormat::FileExtension(ext) => image::ImageFormat::from_extension(ext.as_str()),
ImageDataFormat::MimeType(t) => t.strip_prefix("image/").and_then(image::ImageFormat::from_extension),
ImageDataFormat::Unknown => None,
};
let mut pending = true;
while pending {
match data.recv() {
Ok(d) => {
pending = !d.is_empty();
full.extend(d);
if let Some(fmt) = format {
if size.is_none() {
if let Ok(mut d) = image::ImageReader::with_format(std::io::Cursor::new(&full), fmt).into_decoder() {
use image::metadata::Orientation::*;
let (mut w, mut h) = d.dimensions();
orientation = d.orientation().unwrap_or(NoTransforms);
if matches!(orientation, Rotate90 | Rotate270 | Rotate90FlipH | Rotate270FlipH) {
mem::swap(&mut w, &mut h)
}
size = Some(PxSize::new(Px(w as i32), Px(h as i32)));
}
if let Some(s) = size {
let decoded_len = s.width.0 as u64 * s.height.0 as u64 * 4;
if decoded_len > max_decoded_len {
let error = formatx!(
"image {size:?} needs to allocate {decoded_len} bytes, but max allowed size is {max_decoded_len} bytes",
);
let _ = app_sender.send(AppEvent::Notify(Event::ImageLoadError { image: id, error }));
return;
}
}
}
} else if is_encoded {
format = image::guess_format(&full).ok();
}
}
Err(_) => {
// cancelled?
return;
}
}
}
if let Some(fmt) = format {
match Self::image_decode(&full[..], fmt, downscale, orientation) {
Ok(img) => {
let (pixels, size, ppi, is_opaque, is_mask) = Self::convert_decoded(img, mask);
let _ = app_sender.send(AppEvent::ImageLoaded(ImageLoadedData {
id,
pixels,
size,
ppi,
is_opaque,
is_mask,
}));
}
Err(e) => {
let _ = app_sender.send(AppEvent::Notify(Event::ImageLoadError {
image: id,
error: e.to_txt(),
}));
}
}
} else if !is_encoded {
let pixels = IpcBytes::from_vec(full);
let is_opaque = pixels.chunks_exact(4).all(|c| c[3] == 255);
let _ = app_sender.send(AppEvent::ImageLoaded(ImageLoadedData {
id,
pixels,
size: size.unwrap(),
ppi,
is_opaque,
is_mask: false,
}));
} else {
let _ = app_sender.send(AppEvent::Notify(Event::ImageLoadError {
image: id,
error: Txt::from_static("unknown format"),
}));
}
});
id
}
pub fn forget(&mut self, id: ImageId) {
self.images.remove(&id);
}
pub fn get(&self, id: ImageId) -> Option<&Image> {
self.images.get(&id)
}
/// Called after receive and decode completes correctly.
pub(crate) fn loaded(&mut self, data: ImageLoadedData) {
let mut flags = ImageDescriptorFlags::empty(); //ImageDescriptorFlags::ALLOW_MIPMAPS;
if data.is_opaque {
flags |= ImageDescriptorFlags::IS_OPAQUE
}
self.images.insert(
data.id,
Image(Arc::new(ImageData::RawData {
size: data.size,
pixels: data.pixels.clone(),
descriptor: ImageDescriptor::new(
data.size.width.0,
data.size.height.0,
if data.is_mask { ImageFormat::R8 } else { ImageFormat::BGRA8 },
flags,
),
ppi: data.ppi,
})),
);
let _ = self.app_sender.send(AppEvent::Notify(Event::ImageLoaded(data)));
}
fn get_format_and_size(fmt: &ImageDataFormat, data: &[u8]) -> Result<(image::ImageFormat, PxSize, image::metadata::Orientation), Txt> {
let fmt = match fmt {
ImageDataFormat::FileExtension(ext) => image::ImageFormat::from_extension(ext.as_str()),
ImageDataFormat::MimeType(t) => t.strip_prefix("image/").and_then(image::ImageFormat::from_extension),
ImageDataFormat::Unknown => None,
ImageDataFormat::Bgra8 { .. } => unreachable!(),
ImageDataFormat::A8 { .. } => unreachable!(),
};
let reader = match fmt {
Some(fmt) => image::ImageReader::with_format(std::io::Cursor::new(data), fmt),
None => image::ImageReader::new(std::io::Cursor::new(data))
.with_guessed_format()
.map_err(|e| e.to_txt())?,
};
match reader.format() {
Some(fmt) => {
use image::metadata::Orientation::*;
let mut decoder = reader.into_decoder().map_err(|e| e.to_string())?;
let (mut w, mut h) = decoder.dimensions();
let orientation = decoder.orientation().unwrap_or(NoTransforms);
if matches!(orientation, Rotate90 | Rotate270 | Rotate90FlipH | Rotate270FlipH) {
mem::swap(&mut w, &mut h)
}
Ok((fmt, PxSize::new(Px(w as i32), Px(h as i32)), orientation))
}
None => Err(Txt::from_static("unknown format")),
}
}
fn image_decode(
buf: &[u8],
format: image::ImageFormat,
downscale: Option<ImageDownscale>,
orientation: image::metadata::Orientation,
) -> image::ImageResult<image::DynamicImage> {
let buf = std::io::Cursor::new(buf);
let mut reader = image::ImageReader::new(buf);
reader.set_format(format);
reader.no_limits();
let mut image = reader.decode()?;
image.apply_orientation(orientation);
if let Some(s) = downscale {
let (img_w, img_h) = (image.width(), image.height());
match s {
ImageDownscale::Fit(s) => {
let w = img_w.min(s.width.0 as u32);
let h = img_h.min(s.height.0 as u32);
if w != img_w || h != img_h {
image = image.resize(w, h, image::imageops::FilterType::Triangle);
}
}
ImageDownscale::Fill(s) => {
let w = img_w.min(s.width.0 as u32);
let h = img_h.min(s.height.0 as u32);
if w != img_w && h != img_h {
image = image.resize_to_fill(w, h, image::imageops::FilterType::Triangle);
}
}
}
}
Ok(image)
}
fn convert_decoded(image: image::DynamicImage, mask: Option<ImageMaskMode>) -> RawLoadedImg {
use image::DynamicImage::*;
let mut is_opaque = true;
let (size, pixels) = match image {
ImageLuma8(img) => (
img.dimensions(),
if mask.is_some() {
let r = img.into_raw();
is_opaque = !r.iter().any(|&a| a < 255);
r
} else {
img.into_raw().into_iter().flat_map(|l| [l, l, l, 255]).collect()
},
),
ImageLumaA8(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::A => img
.into_raw()
.chunks(2)
.map(|la| {
if la[1] < 255 {
is_opaque = false;
}
la[1]
})
.collect(),
ImageMaskMode::B | ImageMaskMode::G | ImageMaskMode::R | ImageMaskMode::Luminance => img
.into_raw()
.chunks(2)
.map(|la| {
if la[0] < 255 {
is_opaque = false;
}
la[0]
})
.collect(),
}
} else {
img.into_raw()
.chunks(2)
.flat_map(|la| {
if la[1] < 255 {
is_opaque = false;
let l = la[0] as f32 * la[1] as f32 / 255.0;
let l = l as u8;
[l, l, l, la[1]]
} else {
let l = la[0];
[l, l, l, la[1]]
}
})
.collect()
},
),
ImageRgb8(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::Luminance | ImageMaskMode::A => img
.into_raw()
.chunks(3)
.map(|c| {
let c = luminance(c);
if c < 255 {
is_opaque = false;
}
c
})
.collect(),
mask => {
let channel = match mask {
ImageMaskMode::B => 2,
ImageMaskMode::G => 1,
ImageMaskMode::R => 0,
_ => unreachable!(),
};
img.into_raw()
.chunks(3)
.map(|c| {
let c = c[channel];
if c < 255 {
is_opaque = false;
}
c
})
.collect()
}
}
} else {
img.into_raw().chunks(3).flat_map(|c| [c[2], c[1], c[0], 255]).collect()
},
),
ImageRgba8(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::Luminance => img
.into_raw()
.chunks(4)
.map(|c| {
let c = luminance(&c[..3]);
if c < 255 {
is_opaque = false;
}
c
})
.collect(),
mask => {
let channel = match mask {
ImageMaskMode::A => 3,
ImageMaskMode::B => 2,
ImageMaskMode::G => 1,
ImageMaskMode::R => 0,
_ => unreachable!(),
};
img.into_raw()
.chunks(4)
.map(|c| {
let c = c[channel];
if c < 255 {
is_opaque = false;
}
c
})
.collect()
}
}
} else {
let mut buf = img.into_raw();
buf.chunks_mut(4).for_each(|c| {
if c[3] < 255 {
is_opaque = false;
let a = c[3] as f32 / 255.0;
c[0..3].iter_mut().for_each(|c| *c = (*c as f32 * a) as u8);
}
c.swap(0, 2);
});
buf
},
),
ImageLuma16(img) => (
img.dimensions(),
if mask.is_some() {
img.into_raw()
.into_iter()
.map(|l| {
let l = (l as f32 / u16::MAX as f32 * 255.0) as u8;
if l < 255 {
is_opaque = false;
}
l
})
.collect()
} else {
img.into_raw()
.into_iter()
.flat_map(|l| {
let l = (l as f32 / u16::MAX as f32 * 255.0) as u8;
[l, l, l, 255]
})
.collect()
},
),
ImageLumaA16(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::A => img
.into_raw()
.chunks(2)
.map(|la| {
if la[1] < u16::MAX {
is_opaque = false;
}
let max = u16::MAX as f32;
let l = la[1] as f32 / max * 255.0;
l as u8
})
.collect(),
ImageMaskMode::B | ImageMaskMode::G | ImageMaskMode::R | ImageMaskMode::Luminance => img
.into_raw()
.chunks(2)
.map(|la| {
if la[0] < u16::MAX {
is_opaque = false;
}
let max = u16::MAX as f32;
let l = la[0] as f32 / max * 255.0;
l as u8
})
.collect(),
}
} else {
img.into_raw()
.chunks(2)
.flat_map(|la| {
let max = u16::MAX as f32;
let l = la[0] as f32 / max;
let a = la[1] as f32 / max * 255.0;
if la[1] < u16::MAX {
is_opaque = false;
let l = (l * a) as u8;
[l, l, l, a as u8]
} else {
let l = (l * 255.0) as u8;
[l, l, l, a as u8]
}
})
.collect()
},
),
ImageRgb16(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::Luminance | ImageMaskMode::A => img
.into_raw()
.chunks(3)
.map(|c| {
let c = luminance_16(c);
if c < 255 {
is_opaque = false;
}
c
})
.collect(),
mask => {
let channel = match mask {
ImageMaskMode::B => 2,
ImageMaskMode::G => 1,
ImageMaskMode::R => 0,
_ => unreachable!(),
};
img.into_raw()
.chunks(3)
.map(|c| {
let c = c[channel];
if c < u16::MAX {
is_opaque = false;
}
(c as f32 / u16::MAX as f32 * 255.0) as u8
})
.collect()
}
}
} else {
img.into_raw()
.chunks(3)
.flat_map(|c| {
let to_u8 = 255.0 / u16::MAX as f32;
[
(c[2] as f32 * to_u8) as u8,
(c[1] as f32 * to_u8) as u8,
(c[0] as f32 * to_u8) as u8,
255,
]
})
.collect()
},
),
ImageRgba16(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::Luminance => img
.into_raw()
.chunks(4)
.map(|c| {
let c = luminance_16(&c[..3]);
if c < 255 {
is_opaque = false;
}
c
})
.collect(),
mask => {
let channel = match mask {
ImageMaskMode::A => 3,
ImageMaskMode::B => 2,
ImageMaskMode::G => 1,
ImageMaskMode::R => 0,
_ => unreachable!(),
};
img.into_raw()
.chunks(4)
.map(|c| {
let c = c[channel];
if c < 255 {
is_opaque = false;
}
(c as f32 / u16::MAX as f32 * 255.0) as u8
})
.collect()
}
}
} else {
img.into_raw()
.chunks(4)
.flat_map(|c| {
if c[3] < u16::MAX {
is_opaque = false;
let max = u16::MAX as f32;
let a = c[3] as f32 / max * 255.0;
[
(c[2] as f32 / max * a) as u8,
(c[1] as f32 / max * a) as u8,
(c[0] as f32 / max * a) as u8,
a as u8,
]
} else {
let to_u8 = 255.0 / u16::MAX as f32;
[
(c[2] as f32 * to_u8) as u8,
(c[1] as f32 * to_u8) as u8,
(c[0] as f32 * to_u8) as u8,
255,
]
}
})
.collect()
},
),
ImageRgb32F(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::Luminance | ImageMaskMode::A => img
.into_raw()
.chunks(3)
.map(|c| {
let c = luminance_f32(c);
if c < 255 {
is_opaque = false;
}
c
})
.collect(),
mask => {
let channel = match mask {
ImageMaskMode::B => 2,
ImageMaskMode::G => 1,
ImageMaskMode::R => 0,
_ => unreachable!(),
};
img.into_raw()
.chunks(3)
.map(|c| {
let c = (c[channel] * 255.0) as u8;
if c < 255 {
is_opaque = false;
}
c
})
.collect()
}
}
} else {
img.into_raw()
.chunks(3)
.flat_map(|c| [(c[2] * 255.0) as u8, (c[1] * 255.0) as u8, (c[0] * 255.0) as u8, 255])
.collect()
},
),
ImageRgba32F(img) => (
img.dimensions(),
if let Some(mask) = mask {
match mask {
ImageMaskMode::Luminance => img
.into_raw()
.chunks(4)
.map(|c| {
let c = luminance_f32(&c[..3]);
if c < 255 {
is_opaque = false;
}
c
})
.collect(),
mask => {
let channel = match mask {
ImageMaskMode::A => 3,
ImageMaskMode::B => 2,
ImageMaskMode::G => 1,
ImageMaskMode::R => 0,
_ => unreachable!(),
};
img.into_raw()
.chunks(4)
.map(|c| {
let c = (c[channel] * 255.0) as u8;
if c < 255 {
is_opaque = false;
}
c
})
.collect()
}
}
} else {
img.into_raw()
.chunks(4)
.flat_map(|c| {
if c[3] < 1.0 {
is_opaque = false;
let a = c[3] * 255.0;
[(c[2] * a) as u8, (c[1] * a) as u8, (c[0] * a) as u8, a as u8]
} else {
[(c[2] * 255.0) as u8, (c[1] * 255.0) as u8, (c[0] * 255.0) as u8, 255]
}
})
.collect()
},
),
_ => unreachable!(),
};
(
IpcBytes::from_vec(pixels),
PxSize::new(Px(size.0 as i32), Px(size.1 as i32)),
None,
is_opaque,
mask.is_some(), // is_mask
)
}
pub fn encode(&self, id: ImageId, format: Txt) {
if !ENCODERS.contains(&format.as_str()) {
let error = formatx!("cannot encode `{id:?}` to `{format}`, unknown format");
let _ = self
.app_sender
.send(AppEvent::Notify(Event::ImageEncodeError { image: id, format, error }));
return;
}
if let Some(img) = self.get(id) {
let fmt = image::ImageFormat::from_extension(format.as_str()).unwrap();
debug_assert!(fmt.can_write());
let img = img.clone();
let sender = self.app_sender.clone();
rayon::spawn(move || {
let mut data = vec![];
match img.encode(fmt, &mut data) {
Ok(_) => {
let _ = sender.send(AppEvent::Notify(Event::ImageEncoded {
image: id,
format,
data: IpcBytes::from_vec(data),
}));
}
Err(e) => {
let error = formatx!("failed to encode `{id:?}` to `{format}`, {e}");
let _ = sender.send(AppEvent::Notify(Event::ImageEncodeError { image: id, format, error }));
}
}
})
} else {
let error = formatx!("cannot encode `{id:?}` to `{format}`, image not found");
let _ = self
.app_sender
.send(AppEvent::Notify(Event::ImageEncodeError { image: id, format, error }));
}
}
pub(crate) fn on_low_memory(&mut self) {
// app-process controls this cache
}
pub(crate) fn clear(&mut self) {
self.images.clear();
}
}
/// (pixels, size, ppi, is_opaque, is_mask)
type RawLoadedImg = (IpcBytes, PxSize, Option<ImagePpi>, bool, bool);
pub(crate) enum ImageData {
RawData {
size: PxSize,
pixels: IpcBytes,
descriptor: ImageDescriptor,
ppi: Option<ImagePpi>,
},
NativeTexture {
uv: webrender::api::units::TexelRect,
texture: gleam::gl::GLuint,
},
}
impl ImageData {
pub fn is_opaque(&self) -> bool {
match self {
ImageData::RawData { descriptor, .. } => descriptor.flags.contains(ImageDescriptorFlags::IS_OPAQUE),
ImageData::NativeTexture { .. } => false,
}
}
pub fn is_mask(&self) -> bool {
match self {
ImageData::RawData { descriptor, .. } => descriptor.format == ImageFormat::R8,
ImageData::NativeTexture { .. } => false,
}
}
}
#[derive(Clone)]
pub(crate) struct Image(Arc<ImageData>);
impl fmt::Debug for Image {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match &*self.0 {
ImageData::RawData {
size,
pixels,
descriptor,
ppi,
} => f
.debug_struct("Image")
.field("size", size)
.field("descriptor", descriptor)
.field("ppi", ppi)
.field("pixels", &format_args!("<{} shared bytes>", pixels.len()))
.finish(),
ImageData::NativeTexture { .. } => unreachable!(),
}
}
}
impl Image {
pub fn descriptor(&self) -> ImageDescriptor {
match &*self.0 {
ImageData::RawData { descriptor, .. } => *descriptor,
ImageData::NativeTexture { .. } => unreachable!(),
}
}
/// Generate a window icon from the image.
pub fn icon(&self) -> Option<Icon> {
let (size, pixels) = match &*self.0 {
ImageData::RawData { size, pixels, .. } => (size, pixels),
ImageData::NativeTexture { .. } => unreachable!(),
};
let width = size.width.0 as u32;
let height = size.height.0 as u32;
if width == 0 || height == 0 || self.0.is_mask() {
None
} else {
let r = if width > 255 || height > 255 {
// resize to max 255
let mut buf = pixels[..].to_vec();
// BGRA to RGBA
buf.chunks_exact_mut(4).for_each(|c| c.swap(0, 2));
let img = image::ImageBuffer::from_raw(width, height, buf).unwrap();
let img = image::DynamicImage::ImageRgba8(img);
let img = img.resize(255, 255, image::imageops::FilterType::Lanczos3);
use image::GenericImageView;
let (width, height) = img.dimensions();
let buf = img.into_rgba8().into_raw();
winit::window::Icon::from_rgba(buf, width, height)
} else {
let mut buf = pixels[..].to_vec();
// BGRA to RGBA
buf.chunks_exact_mut(4).for_each(|c| c.swap(0, 2));
winit::window::Icon::from_rgba(buf, width, height)
};
match r {
Ok(i) => Some(i),
Err(e) => {
tracing::error!("failed to convert image to custom icon, {e}");
None
}
}
}
}
/// Generate a cursor from the image.
pub fn cursor(&self, hotspot: PxPoint, event_loop: &ActiveEventLoop) -> Option<CustomCursor> {
let (size, pixels) = match &*self.0 {
ImageData::RawData { size, pixels, .. } => (size, pixels),
ImageData::NativeTexture { .. } => unreachable!(),
};
let width: u16 = size.width.0.try_into().ok()?;
let height: u16 = size.height.0.try_into().ok()?;
let hotspot_x: u16 = hotspot.x.0.try_into().ok()?;
let hotspot_y: u16 = hotspot.y.0.try_into().ok()?;
if width == 0 || height == 0 || hotspot_x > width || hotspot_y > height || self.0.is_mask() {
None
} else {
let mut buf = pixels[..].to_vec();
// BGRA to RGBA
buf.chunks_exact_mut(4).for_each(|c| c.swap(0, 2));
match CustomCursor::from_rgba(buf, width, height, hotspot_x, hotspot_y) {
Ok(c) => Some(event_loop.create_custom_cursor(c)),
Err(e) => {
tracing::error!("failed to convert image to custom cursor, {e}");
None
}
}
}
}
pub fn encode(&self, format: image::ImageFormat, buffer: &mut Vec<u8>) -> image::ImageResult<()> {
let (size, pixels, ppi) = match &*self.0 {
ImageData::RawData { size, pixels, ppi, .. } => (size, pixels, ppi),
ImageData::NativeTexture { .. } => unreachable!(),
};
if size.width <= 0 || size.height <= 0 {
return Err(image::ImageError::IoError(std::io::Error::new(
std::io::ErrorKind::InvalidInput,
"cannot encode zero sized image",
)));
}
use image::*;
if self.0.is_mask() {
let width = size.width.0 as u32;
let height = size.height.0 as u32;
let is_opaque = self.0.is_opaque();
let r8 = pixels[..].to_vec();
let mut img = image::DynamicImage::ImageLuma8(image::ImageBuffer::from_raw(width, height, r8).unwrap());
if is_opaque {
img = image::DynamicImage::ImageRgb8(img.to_rgb8());
}
img.write_to(&mut std::io::Cursor::new(buffer), format)?;
return Ok(());
}
// invert rows, `image` only supports top-to-bottom buffers.
let mut buf = pixels[..].to_vec();
// BGRA to RGBA
buf.chunks_exact_mut(4).for_each(|c| c.swap(0, 2));
let rgba = buf;
let width = size.width.0 as u32;
let height = size.height.0 as u32;
let is_opaque = self.0.is_opaque();
match format {
ImageFormat::Jpeg => {
let mut jpg = codecs::jpeg::JpegEncoder::new(buffer);
if let Some(ppi) = ppi {
jpg.set_pixel_density(codecs::jpeg::PixelDensity {
density: (ppi.x as u16, ppi.y as u16),
unit: codecs::jpeg::PixelDensityUnit::Inches,
});
}
jpg.encode(&rgba, width, height, ColorType::Rgba8.into())?;
}
ImageFormat::Png => {
let mut img = image::DynamicImage::ImageRgba8(image::ImageBuffer::from_raw(width, height, rgba).unwrap());
if is_opaque {
img = image::DynamicImage::ImageRgb8(img.to_rgb8());
}
if let Some(ppi) = ppi {
let mut png_bytes = vec![];
img.write_to(&mut std::io::Cursor::new(&mut png_bytes), ImageFormat::Png)?;
let mut png = img_parts::png::Png::from_bytes(png_bytes.into()).unwrap();
let chunk_kind = *b"pHYs";
debug_assert!(png.chunk_by_type(chunk_kind).is_none());
use byteorder::*;
let mut chunk = Vec::with_capacity(4 * 2 + 1);
// ppi / inch_to_metric
let ppm_x = (ppi.x / 0.0254) as u32;
let ppm_y = (ppi.y / 0.0254) as u32;
chunk.write_u32::<BigEndian>(ppm_x).unwrap();
chunk.write_u32::<BigEndian>(ppm_y).unwrap();
chunk.write_u8(1).unwrap(); // metric
let chunk = img_parts::png::PngChunk::new(chunk_kind, chunk.into());
png.chunks_mut().insert(1, chunk);
png.encoder().write_to(buffer)?;
} else {
img.write_to(&mut std::io::Cursor::new(buffer), ImageFormat::Png)?;
}
}
_ => {
// other formats that we don't with custom PPI meta.
let mut img = image::DynamicImage::ImageRgba8(image::ImageBuffer::from_raw(width, height, rgba).unwrap());
if is_opaque {
img = image::DynamicImage::ImageRgb8(img.to_rgb8());
}
img.write_to(&mut std::io::Cursor::new(buffer), format)?;
}
}
Ok(())
}
#[allow(unused)]
pub fn size(&self) -> PxSize {
match &*self.0 {
ImageData::RawData { size, .. } => *size,
ImageData::NativeTexture { .. } => unreachable!(),
}
}
#[allow(unused)]
pub fn pixels(&self) -> &IpcBytes {
match &*self.0 {
ImageData::RawData { pixels, .. } => pixels,
ImageData::NativeTexture { .. } => unreachable!(),
}
}
}
// Image data is provided to webrender directly from the BGRA8 shared memory.
// The `ExternalImageId` is the Arc pointer to ImageData.
mod external {
use std::{collections::hash_map::Entry, sync::Arc};
use rustc_hash::FxHashMap;
use webrender::{
api::{
units::{ImageDirtyRect, TexelRect},
DocumentId, ExternalImage, ExternalImageData, ExternalImageHandler, ExternalImageId, ExternalImageSource, ExternalImageType,
ImageKey,
},
RenderApi,
};
use zng_view_api::image::ImageTextureId;
use super::{Image, ImageData};
/// Implements [`ExternalImageHandler`].
///
/// # Safety
///
/// This is only safe if use with [`ImageUseMap`].
pub(crate) struct WrImageCache {
locked: Vec<Arc<ImageData>>,
}
impl WrImageCache {
pub fn new_boxed() -> Box<dyn ExternalImageHandler> {
Box::new(WrImageCache { locked: vec![] })
}
}
impl ExternalImageHandler for WrImageCache {
fn lock(&mut self, key: ExternalImageId, _channel_index: u8) -> ExternalImage {
// SAFETY: this is safe because the Arc is kept alive in `ImageUseMap`.
let img = unsafe {
let ptr = key.0 as *const ImageData;
Arc::increment_strong_count(ptr);
Arc::<ImageData>::from_raw(ptr)
};
self.locked.push(img); // keep alive in case the image is removed mid-use
match &**self.locked.last().unwrap() {
ImageData::RawData { pixels, .. } => {
ExternalImage {
uv: TexelRect::invalid(), // `RawData` does not use `uv`.
source: ExternalImageSource::RawData(&pixels[..]),
}
}
ImageData::NativeTexture { uv, texture: id } => ExternalImage {
uv: *uv,
source: ExternalImageSource::NativeTexture(*id),
},
}
}
fn unlock(&mut self, key: ExternalImageId, _channel_index: u8) {
if let Some(i) = self.locked.iter().position(|d| ExternalImageId(Arc::as_ptr(d) as _) == key) {
self.locked.swap_remove(i);
} else {
debug_assert!(false);
}
}
}
impl Image {
fn external_id(&self) -> ExternalImageId {
ExternalImageId(Arc::as_ptr(&self.0) as u64)
}
fn data(&self) -> webrender::api::ImageData {
webrender::api::ImageData::External(ExternalImageData {
id: self.external_id(),
channel_index: 0,
image_type: ExternalImageType::Buffer,
normalized_uvs: false,
})
}
}
/// Track and manage images used in a renderer.
///
/// The renderer must use [`WrImageCache`] as the external image source.
#[derive(Default)]
pub(crate) struct ImageUseMap {
id_tex: FxHashMap<ExternalImageId, (ImageTextureId, Image)>,
tex_id: FxHashMap<ImageTextureId, ExternalImageId>,
}
impl ImageUseMap {
pub fn new_use(&mut self, image: &Image, document_id: DocumentId, api: &mut RenderApi) -> ImageTextureId {
let id = image.external_id();
match self.id_tex.entry(id) {
Entry::Occupied(e) => e.get().0,
Entry::Vacant(e) => {
let key = api.generate_image_key();
let tex_id = ImageTextureId::from_raw(key.1);
e.insert((tex_id, image.clone())); // keep the image Arc alive, we expect this in `WrImageCache`.
self.tex_id.insert(tex_id, id);
let mut txn = webrender::Transaction::new();
txn.add_image(key, image.descriptor(), image.data(), None);
api.send_transaction(document_id, txn);
tex_id
}
}
}
/// Returns if needs to update.
pub fn update_use(&mut self, texture_id: ImageTextureId, image: &Image, document_id: DocumentId, api: &mut RenderApi) {
if let Entry::Occupied(mut e) = self.tex_id.entry(texture_id) {
let id = image.external_id();
if *e.get() != id {
let prev_id = e.insert(id);
self.id_tex.remove(&prev_id).unwrap();
self.id_tex.insert(id, (texture_id, image.clone()));
let mut txn = webrender::Transaction::new();
txn.update_image(
ImageKey(api.get_namespace_id(), texture_id.get()),
image.descriptor(),
image.data(),
&ImageDirtyRect::All,
);
api.send_transaction(document_id, txn);
}
}
}
pub fn delete(&mut self, texture_id: ImageTextureId, document_id: DocumentId, api: &mut RenderApi) {
if let Some(id) = self.tex_id.remove(&texture_id) {
let _img = self.id_tex.remove(&id); // remove but keep alive until the transaction is done.
let mut txn = webrender::Transaction::new();
txn.delete_image(ImageKey(api.get_namespace_id(), texture_id.get()));
api.send_transaction(document_id, txn);
}
}
}
}
pub(crate) use external::{ImageUseMap, WrImageCache};
mod capture {
use std::sync::Arc;
use webrender::api::{ImageDescriptor, ImageDescriptorFlags, ImageFormat};
use zng_txt::formatx;
use zng_unit::{Factor, PxRect};
use zng_view_api::{
image::{ImageDataFormat, ImageId, ImageLoadedData, ImageMaskMode, ImagePpi, ImageRequest},
ipc::IpcBytes,
window::{FrameId, WindowId},
Event,
};
use crate::{
image_cache::{Image, ImageData},
AppEvent,
};
use super::ImageCache;
impl ImageCache {
/// Create frame_image for an `Api::frame_image` request.
pub fn frame_image(
&mut self,
gl: &dyn gleam::gl::Gl,
rect: PxRect,
window_id: WindowId,
frame_id: FrameId,
scale_factor: Factor,
mask: Option<ImageMaskMode>,
) -> ImageId {
if frame_id == FrameId::INVALID {
let id = self.image_id_gen.incr();
let _ = self.app_sender.send(AppEvent::Notify(Event::ImageLoadError {
image: id,
error: formatx!("no frame rendered in window `{window_id:?}`"),
}));
let _ = self.app_sender.send(AppEvent::Notify(Event::FrameImageReady {
window: window_id,
frame: frame_id,
image: id,
selection: rect,
}));
return id;
}
let data = self.frame_image_data(gl, rect, scale_factor, mask);
let id = data.id;
let _ = self.app_sender.send(AppEvent::ImageLoaded(data));
let _ = self.app_sender.send(AppEvent::Notify(Event::FrameImageReady {
window: window_id,
frame: frame_id,
image: id,
selection: rect,
}));
id
}
/// Create frame_image for a capture request in the FrameRequest.
pub fn frame_image_data(
&mut self,
gl: &dyn gleam::gl::Gl,
rect: PxRect,
scale_factor: Factor,
mask: Option<ImageMaskMode>,
) -> ImageLoadedData {
let data = self.frame_image_data_impl(gl, rect, scale_factor, mask);
let flags = if data.is_opaque {
ImageDescriptorFlags::IS_OPAQUE
} else {
ImageDescriptorFlags::empty()
};
self.images.insert(
data.id,
Image(Arc::new(ImageData::RawData {
size: data.size,
pixels: data.pixels.clone(),
descriptor: ImageDescriptor::new(
data.size.width.0,
data.size.height.0,
if data.is_mask { ImageFormat::R8 } else { ImageFormat::BGRA8 },
flags,
),
ppi: data.ppi,
})),
);
data
}
fn frame_image_data_impl(
&mut self,
gl: &dyn gleam::gl::Gl,
rect: PxRect,
scale_factor: Factor,
mask: Option<ImageMaskMode>,
) -> ImageLoadedData {
let format = match gl.get_type() {
gleam::gl::GlType::Gl => gleam::gl::BGRA,
gleam::gl::GlType::Gles => gleam::gl::RGBA,
};
let pixels_flipped = gl.read_pixels(
rect.origin.x.0,
rect.origin.y.0,
rect.size.width.0,
rect.size.height.0,
format,
gleam::gl::UNSIGNED_BYTE,
);
let mut buf = vec![0u8; pixels_flipped.len()];
assert_eq!(rect.size.width.0 as usize * rect.size.height.0 as usize * 4, buf.len());
let stride = 4 * rect.size.width.0 as usize;
for (px, buf) in pixels_flipped.chunks_exact(stride).rev().zip(buf.chunks_exact_mut(stride)) {
buf.copy_from_slice(px);
}
if let Some(mask) = mask {
if format == gleam::gl::BGRA {
for bgra in buf.chunks_exact_mut(4) {
bgra.swap(0, 3);
}
}
let (pixels, size, ppi, is_opaque, is_mask) = Self::convert_decoded(
image::DynamicImage::ImageRgba8(
image::ImageBuffer::from_raw(rect.size.width.0 as u32, rect.size.height.0 as u32, buf).unwrap(),
),
Some(mask),
);
let id = self.add(ImageRequest {
format: ImageDataFormat::A8 { size },
data: pixels.clone(),
max_decoded_len: u64::MAX,
downscale: None,
mask: Some(mask),
});
ImageLoadedData {
id,
size,
ppi,
is_opaque,
is_mask,
pixels,
}
} else {
if format == gleam::gl::RGBA {
for rgba in buf.chunks_exact_mut(4) {
rgba.swap(0, 3);
}
}
let is_opaque = buf.chunks_exact(4).all(|bgra| bgra[3] == 255);
let data = IpcBytes::from_vec(buf);
let ppi = 96.0 * scale_factor.0;
let ppi = Some(ImagePpi::splat(ppi));
let size = rect.size;
let id = self.add(ImageRequest {
format: ImageDataFormat::Bgra8 { size, ppi },
data: data.clone(),
max_decoded_len: u64::MAX,
downscale: None,
mask,
});
ImageLoadedData {
id,
size,
ppi,
is_opaque,
pixels: data,
is_mask: false,
}
}
}
}
}
fn luminance(rgb: &[u8]) -> u8 {
let r = rgb[0] as f32 / 255.0;
let g = rgb[1] as f32 / 255.0;
let b = rgb[2] as f32 / 255.0;
let l = r * 0.2126 + g * 0.7152 + b * 0.0722;
(l * 255.0) as u8
}
fn luminance_16(rgb: &[u16]) -> u8 {
let max = u16::MAX as f32;
let r = rgb[0] as f32 / max;
let g = rgb[1] as f32 / max;
let b = rgb[2] as f32 / max;
let l = r * 0.2126 + g * 0.7152 + b * 0.0722;
(l * 255.0) as u8
}
fn luminance_f32(rgb: &[f32]) -> u8 {
let r = rgb[0];
let g = rgb[1];
let b = rgb[2];
let l = r * 0.2126 + g * 0.7152 + b * 0.0722;
(l * 255.0) as u8
}