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// Copyright © SixtyFPS GmbH <info@slint-ui.com>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
use crate::slice::Slice;
use crate::{SharedString, SharedVector};
use super::{IntRect, IntSize};
/// SharedPixelBuffer is a container for storing image data as pixels. It is
/// internally reference counted and cheap to clone.
///
/// You can construct a new empty shared pixel buffer with [`SharedPixelBuffer::new`],
/// or you can clone it from an existing contiguous buffer that you might already have, using
/// [`SharedPixelBuffer::clone_from_slice`].
///
/// See the documentation for [`Image`] for examples how to use this type to integrate
/// Slint with external rendering functions.
#[derive(Debug, Clone)]
#[repr(C)]
pub struct SharedPixelBuffer<Pixel> {
width: u32,
height: u32,
stride: u32,
data: SharedVector<Pixel>,
}
impl<Pixel> SharedPixelBuffer<Pixel> {
/// Returns the width of the image in pixels.
pub fn width(&self) -> u32 {
self.width
}
/// Returns the height of the image in pixels.
pub fn height(&self) -> u32 {
self.height
}
/// Returns the size of the image in pixels.
pub fn size(&self) -> IntSize {
[self.width, self.height].into()
}
/// Returns the number of pixels per line.
pub fn stride(&self) -> u32 {
self.stride
}
}
impl<Pixel: Clone> SharedPixelBuffer<Pixel> {
/// Return a mutable slice to the pixel data. If the SharedPixelBuffer was shared, this will make a copy of the buffer.
pub fn make_mut_slice(&mut self) -> &mut [Pixel] {
self.data.make_mut_slice()
}
}
impl<Pixel: Clone + rgb::Pod> SharedPixelBuffer<Pixel>
where
[Pixel]: rgb::ComponentBytes<u8>,
{
/// Returns the pixels interpreted as raw bytes.
pub fn as_bytes(&self) -> &[u8] {
use rgb::ComponentBytes;
self.data.as_slice().as_bytes()
}
/// Returns the pixels interpreted as raw bytes.
pub fn make_mut_bytes(&mut self) -> &mut [u8] {
use rgb::ComponentBytes;
self.data.make_mut_slice().as_bytes_mut()
}
}
impl<Pixel> SharedPixelBuffer<Pixel> {
/// Return a slice to the pixel data.
pub fn as_slice(&self) -> &[Pixel] {
self.data.as_slice()
}
}
impl<Pixel: Clone + Default> SharedPixelBuffer<Pixel> {
/// Creates a new SharedPixelBuffer with the given width and height. Each pixel will be initialized with the value
/// that [`Default::default()`] returns for the Pixel type.
pub fn new(width: u32, height: u32) -> Self {
Self {
width,
height,
stride: width,
data: core::iter::repeat(Pixel::default())
.take(width as usize * height as usize)
.collect(),
}
}
}
impl<Pixel: Clone> SharedPixelBuffer<Pixel> {
/// Creates a new SharedPixelBuffer by cloning and converting pixels from an existing
/// slice. This function is useful when another crate was used to allocate an image
/// and you would like to convert it for use in Slint.
pub fn clone_from_slice<SourcePixelType>(
pixel_slice: &[SourcePixelType],
width: u32,
height: u32,
) -> Self
where
[SourcePixelType]: rgb::AsPixels<Pixel>,
{
use rgb::AsPixels;
Self {
width,
height,
stride: width,
data: pixel_slice.as_pixels().iter().cloned().collect(),
}
}
}
/// Convenience alias for a pixel with three color channels (red, green and blue), each
/// encoded as u8.
pub type Rgb8Pixel = rgb::RGB8;
/// Convenience alias for a pixel with four color channels (red, green, blue and alpha), each
/// encoded as u8.
pub type Rgba8Pixel = rgb::RGBA8;
/// SharedImageBuffer is a container for images that are stored in CPU accessible memory.
///
/// The SharedImageBuffer's variants represent the different common formats for encoding
/// images in pixels.
#[derive(Clone, Debug)]
#[repr(C)]
pub enum SharedImageBuffer {
/// This variant holds the data for an image where each pixel has three color channels (red, green,
/// and blue) and each channel is encoded as unsigned byte.
RGB8(SharedPixelBuffer<Rgb8Pixel>),
/// This variant holds the data for an image where each pixel has four color channels (red, green,
/// blue and alpha) and each channel is encoded as unsigned byte.
RGBA8(SharedPixelBuffer<Rgba8Pixel>),
/// This variant holds the data for an image where each pixel has four color channels (red, green,
/// blue and alpha) and each channel is encoded as unsigned byte. In contrast to [`Self::RGBA8`],
/// this variant assumes that the alpha channel is also already multiplied to each red, green and blue
/// component of each pixel.
/// Only construct this format if you know that your pixels are encoded this way. It is more efficient
/// for rendering.
RGBA8Premultiplied(SharedPixelBuffer<Rgba8Pixel>),
}
impl SharedImageBuffer {
/// Returns the width of the image in pixels.
#[inline]
pub fn width(&self) -> u32 {
match self {
Self::RGB8(buffer) => buffer.width(),
Self::RGBA8(buffer) => buffer.width(),
Self::RGBA8Premultiplied(buffer) => buffer.width(),
}
}
/// Returns the height of the image in pixels.
#[inline]
pub fn height(&self) -> u32 {
match self {
Self::RGB8(buffer) => buffer.height(),
Self::RGBA8(buffer) => buffer.height(),
Self::RGBA8Premultiplied(buffer) => buffer.height(),
}
}
/// Returns the size of the image in pixels.
#[inline]
pub fn size(&self) -> IntSize {
match self {
Self::RGB8(buffer) => buffer.size(),
Self::RGBA8(buffer) => buffer.size(),
Self::RGBA8Premultiplied(buffer) => buffer.size(),
}
}
}
impl PartialEq for SharedImageBuffer {
fn eq(&self, other: &Self) -> bool {
match self {
Self::RGB8(lhs_buffer) => {
matches!(other, Self::RGB8(rhs_buffer) if lhs_buffer.data.as_ptr().eq(&rhs_buffer.data.as_ptr()))
}
Self::RGBA8(lhs_buffer) => {
matches!(other, Self::RGBA8(rhs_buffer) if lhs_buffer.data.as_ptr().eq(&rhs_buffer.data.as_ptr()))
}
Self::RGBA8Premultiplied(lhs_buffer) => {
matches!(other, Self::RGBA8Premultiplied(rhs_buffer) if lhs_buffer.data.as_ptr().eq(&rhs_buffer.data.as_ptr()))
}
}
}
}
#[repr(u8)]
#[derive(Clone, PartialEq, Debug, Copy)]
/// The pixel format of a StaticTexture
pub enum PixelFormat {
/// red, green, blue
Rgb,
/// Red, green, blue, alpha
Rgba,
/// A map
AlphaMap,
}
#[repr(C)]
#[derive(Clone, PartialEq, Debug)]
/// Some raw pixel data which is typically stored in the binary
pub struct StaticTexture {
/// The position and size of the texture within the image
pub rect: IntRect,
/// The pixel format of this texture
pub format: PixelFormat,
/// The color, for the alpha map ones
pub color: crate::Color,
/// index in the data array
pub index: usize,
}
#[repr(C)]
#[derive(Clone, PartialEq, Debug)]
/// A texture is stored in read-only memory and may be composed of sub-textures.
pub struct StaticTextures {
/// The total size of the image (this might not be the size of the full image
/// as some transparent part are not part of any texture)
pub size: IntSize,
/// The size of the image before the compiler applied any scaling
pub original_size: IntSize,
/// The pixel data referenced by the textures
pub data: Slice<'static, u8>,
/// The list of textures
pub textures: Slice<'static, StaticTexture>,
}
/// A resource is a reference to binary data, for example images. They can be accessible on the file
/// system or embedded in the resulting binary. Or they might be URLs to a web server and a downloaded
/// is necessary before they can be used.
/// cbindgen:prefix-with-name
#[derive(Clone, PartialEq, Debug)]
#[repr(u8)]
#[allow(missing_docs)]
pub enum ImageInner {
/// A resource that does not represent any data.
None,
/// A resource that points to a file in the file system
AbsoluteFilePath(SharedString),
/// A image file that is embedded in the program as is. The format is the extension
EmbeddedData {
data: Slice<'static, u8>,
format: Slice<'static, u8>,
},
EmbeddedImage(SharedImageBuffer),
StaticTextures(&'static StaticTextures),
}
impl Default for ImageInner {
fn default() -> Self {
ImageInner::None
}
}
impl ImageInner {
/// Returns true if the image is a scalable vector image.
pub fn is_svg(&self) -> bool {
match self {
ImageInner::AbsoluteFilePath(path) => path.ends_with(".svg") || path.ends_with(".svgz"),
ImageInner::EmbeddedData { format, .. } => {
format.as_slice() == b"svg" || format.as_slice() == b"svgz"
}
_ => false,
}
}
}
impl<'a> From<&'a Image> for &'a ImageInner {
fn from(other: &'a Image) -> Self {
&other.0
}
}
/// Error generated if an image cannot be loaded for any reasons.
#[derive(Default, Debug, PartialEq)]
pub struct LoadImageError(());
/// An image type that can be displayed by the Image element. You can construct
/// Image objects from a path to an image file on disk, using [`Self::load_from_path`].
///
/// Another typical use-case is to render the image content with Rust code.
/// For this it's most efficient to create a new SharedPixelBuffer with the known dimensions
/// and pass the mutable slice to your rendering function. Afterwards you can create an
/// Image.
///
/// The following example creates a 320x200 RGB pixel buffer and calls an external
/// low_level_render() function to draw a shape into it. Finally the result is
/// stored in an Image with [`Self::from_rgb8()`]:
/// ```
/// # use i_slint_core::graphics::{SharedPixelBuffer, Image, Rgb8Pixel};
///
/// fn low_level_render(width: u32, height: u32, buffer: &mut [u8]) {
/// // render beautiful circle or other shapes here
/// }
///
/// let mut pixel_buffer = SharedPixelBuffer::<Rgb8Pixel>::new(320, 200);
///
/// low_level_render(pixel_buffer.width(), pixel_buffer.height(),
/// pixel_buffer.make_mut_bytes());
///
/// let image = Image::from_rgb8(pixel_buffer);
/// ```
///
/// Another use-case is to import existing image data into Slint, by
/// creating a new Image through cloning of another image type.
///
/// The following example uses the popular [image crate](https://docs.rs/image/) to
/// load a `.png` file from disk, apply brightening filter on it and then import
/// it into an [`Image`]:
/// ```no_run
/// # use i_slint_core::graphics::{SharedPixelBuffer, Image, Rgba8Pixel};
/// let mut cat_image = image::open("cat.png").expect("Error loading cat image").into_rgba8();
///
/// image::imageops::colorops::brighten_in_place(&mut cat_image, 20);
///
/// let buffer = SharedPixelBuffer::<Rgba8Pixel>::clone_from_slice(
/// cat_image.as_raw(),
/// cat_image.width(),
/// cat_image.height(),
/// );
/// let image = Image::from_rgba8(buffer);
/// ```
///
/// A popular software (CPU) rendering library in Rust is tiny-skia. The following example shows
/// how to use tiny-skia to render into a [`SharedPixelBuffer`]:
/// ```
/// # use i_slint_core::graphics::{SharedPixelBuffer, Image, Rgba8Pixel};
/// let mut pixel_buffer = SharedPixelBuffer::<Rgba8Pixel>::new(640, 480);
/// let width = pixel_buffer.width();
/// let height = pixel_buffer.height();
/// let mut pixmap = tiny_skia::PixmapMut::from_bytes(
/// pixel_buffer.make_mut_bytes(), width, height
/// ).unwrap();
/// pixmap.fill(tiny_skia::Color::TRANSPARENT);
///
/// let circle = tiny_skia::PathBuilder::from_circle(320., 240., 150.).unwrap();
///
/// let mut paint = tiny_skia::Paint::default();
/// paint.shader = tiny_skia::LinearGradient::new(
/// tiny_skia::Point::from_xy(100.0, 100.0),
/// tiny_skia::Point::from_xy(400.0, 400.0),
/// vec![
/// tiny_skia::GradientStop::new(0.0, tiny_skia::Color::from_rgba8(50, 127, 150, 200)),
/// tiny_skia::GradientStop::new(1.0, tiny_skia::Color::from_rgba8(220, 140, 75, 180)),
/// ],
/// tiny_skia::SpreadMode::Pad,
/// tiny_skia::Transform::identity(),
/// ).unwrap();
///
/// pixmap.fill_path(&circle, &paint, tiny_skia::FillRule::Winding, Default::default(), None);
///
/// let image = Image::from_rgba8_premultiplied(pixel_buffer);
/// ```
#[repr(transparent)]
#[derive(Default, Clone, Debug, PartialEq, derive_more::From)]
pub struct Image(ImageInner);
impl Image {
#[cfg(feature = "std")]
/// Load an Image from a path to a file containing an image
pub fn load_from_path(path: &std::path::Path) -> Result<Self, LoadImageError> {
Ok(Image(ImageInner::AbsoluteFilePath(path.to_str().ok_or(LoadImageError(()))?.into())))
}
/// Creates a new Image from the specified shared pixel buffer, where each pixel has three color
/// channels (red, green and blue) encoded as u8.
pub fn from_rgb8(buffer: SharedPixelBuffer<Rgb8Pixel>) -> Self {
Image(ImageInner::EmbeddedImage(SharedImageBuffer::RGB8(buffer)))
}
/// Creates a new Image from the specified shared pixel buffer, where each pixel has four color
/// channels (red, green, blue and alpha) encoded as u8.
pub fn from_rgba8(buffer: SharedPixelBuffer<Rgba8Pixel>) -> Self {
Image(ImageInner::EmbeddedImage(SharedImageBuffer::RGBA8(buffer)))
}
/// Creates a new Image from the specified shared pixel buffer, where each pixel has four color
/// channels (red, green, blue and alpha) encoded as u8 and, in contrast to [`Self::from_rgba8`],
/// the alpha channel is also assumed to be multiplied to the red, green and blue channels.
///
/// Only construct an Image with this function if you know that your pixels are encoded this way.
pub fn from_rgba8_premultiplied(buffer: SharedPixelBuffer<Rgba8Pixel>) -> Self {
Image(ImageInner::EmbeddedImage(SharedImageBuffer::RGBA8Premultiplied(buffer)))
}
/// Returns the size of the Image in pixels.
pub fn size(&self) -> IntSize {
match &self.0 {
ImageInner::None => Default::default(),
ImageInner::AbsoluteFilePath(_) | ImageInner::EmbeddedData { .. } => {
match crate::backend::instance() {
Some(backend) => backend.image_size(self),
None => panic!("slint::Image::size() called too early (before a graphics backend was chosen). You need to create a component first."),
}
},
ImageInner::EmbeddedImage(buffer) => buffer.size(),
ImageInner::StaticTextures(StaticTextures { original_size, .. }) => *original_size,
}
}
#[cfg(feature = "std")]
/// Returns the path of the image on disk, if it was constructed via [`Self::load_from_path`].
///
/// For example:
/// ```
/// # use std::path::Path;
/// # use i_slint_core::graphics::*;
/// let path_buf = Path::new(env!("CARGO_MANIFEST_DIR"))
/// .join("../../examples/printerdemo/ui/images/cat.jpg");
/// let image = Image::load_from_path(&path_buf).unwrap();
/// assert_eq!(image.path(), Some(path_buf.as_path()));
/// ```
pub fn path(&self) -> Option<&std::path::Path> {
match &self.0 {
ImageInner::AbsoluteFilePath(path) => Some(std::path::Path::new(path.as_str())),
_ => None,
}
}
}
#[test]
fn test_image_size_from_buffer_without_backend() {
{
assert_eq!(Image::default().size(), Default::default());
}
{
let buffer = SharedPixelBuffer::<Rgb8Pixel>::new(320, 200);
let image = Image::from_rgb8(buffer);
assert_eq!(image.size(), [320, 200].into())
}
}
#[cfg(feature = "ffi")]
pub(crate) mod ffi {
#![allow(unsafe_code)]
use super::super::IntSize;
use super::*;
/// Expand Rgb8Pixel so that cbindgen can see it. (is in fact rgb::RGB<u8>)
#[cfg(cbindgen)]
#[repr(C)]
struct Rgb8Pixel {
r: u8,
g: u8,
b: u8,
}
/// Expand Rgba8Pixel so that cbindgen can see it. (is in fact rgb::RGBA<u8>)
#[cfg(cbindgen)]
#[repr(C)]
struct Rgba8Pixel {
r: u8,
g: u8,
b: u8,
}
#[no_mangle]
pub unsafe extern "C" fn slint_image_size(image: &Image) -> IntSize {
image.size()
}
#[no_mangle]
pub unsafe extern "C" fn slint_image_path(image: &Image) -> Option<&SharedString> {
match &image.0 {
ImageInner::AbsoluteFilePath(path) => Some(&path),
_ => None,
}
}
}