diff options
| -rw-r--r-- | examples/screenshot/Cargo.toml | 11 | ||||
| -rw-r--r-- | examples/screenshot/src/main.rs | 320 | ||||
| -rw-r--r-- | graphics/src/compositor.rs | 15 | ||||
| -rw-r--r-- | renderer/src/compositor.rs | 30 | ||||
| -rw-r--r-- | runtime/src/window.rs | 10 | ||||
| -rw-r--r-- | runtime/src/window/action.rs | 9 | ||||
| -rw-r--r-- | runtime/src/window/screenshot.rs | 92 | ||||
| -rw-r--r-- | src/lib.rs | 1 | ||||
| -rw-r--r-- | tiny_skia/src/window/compositor.rs | 76 | ||||
| -rw-r--r-- | wgpu/src/color.rs | 165 | ||||
| -rw-r--r-- | wgpu/src/lib.rs | 1 | ||||
| -rw-r--r-- | wgpu/src/triangle/msaa.rs | 11 | ||||
| -rw-r--r-- | wgpu/src/window/compositor.rs | 152 | ||||
| -rw-r--r-- | widget/src/button.rs | 13 | ||||
| -rw-r--r-- | winit/src/application.rs | 39 |
15 files changed, 921 insertions, 24 deletions
diff --git a/examples/screenshot/Cargo.toml b/examples/screenshot/Cargo.toml new file mode 100644 index 00000000..b79300b7 --- /dev/null +++ b/examples/screenshot/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "screenshot" +version = "0.1.0" +authors = ["Bingus <shankern@protonmail.com>"] +edition = "2021" +publish = false + +[dependencies] +iced = { path = "../..", features = ["debug", "image", "advanced"] } +image = { version = "0.24.6", features = ["png"]} +env_logger = "0.10.0" diff --git a/examples/screenshot/src/main.rs b/examples/screenshot/src/main.rs new file mode 100644 index 00000000..83824535 --- /dev/null +++ b/examples/screenshot/src/main.rs @@ -0,0 +1,320 @@ +use iced::alignment; +use iced::keyboard::KeyCode; +use iced::theme::{Button, Container}; +use iced::widget::{button, column, container, image, row, text, text_input}; +use iced::window::screenshot::{self, Screenshot}; +use iced::{ + event, executor, keyboard, subscription, Alignment, Application, Command, + ContentFit, Element, Event, Length, Rectangle, Renderer, Subscription, + Theme, +}; + +use ::image as img; +use ::image::ColorType; + +fn main() -> iced::Result { + env_logger::builder().format_timestamp(None).init(); + + Example::run(iced::Settings::default()) +} + +struct Example { + screenshot: Option<Screenshot>, + saved_png_path: Option<Result<String, PngError>>, + png_saving: bool, + crop_error: Option<screenshot::CropError>, + x_input_value: Option<u32>, + y_input_value: Option<u32>, + width_input_value: Option<u32>, + height_input_value: Option<u32>, +} + +#[derive(Clone, Debug)] +enum Message { + Crop, + Screenshot, + ScreenshotData(Screenshot), + Png, + PngSaved(Result<String, PngError>), + XInputChanged(Option<u32>), + YInputChanged(Option<u32>), + WidthInputChanged(Option<u32>), + HeightInputChanged(Option<u32>), +} + +impl Application for Example { + type Executor = executor::Default; + type Message = Message; + type Theme = Theme; + type Flags = (); + + fn new(_flags: Self::Flags) -> (Self, Command<Self::Message>) { + ( + Example { + screenshot: None, + saved_png_path: None, + png_saving: false, + crop_error: None, + x_input_value: None, + y_input_value: None, + width_input_value: None, + height_input_value: None, + }, + Command::none(), + ) + } + + fn title(&self) -> String { + "Screenshot".to_string() + } + + fn update(&mut self, message: Self::Message) -> Command<Self::Message> { + match message { + Message::Screenshot => { + return iced::window::screenshot(Message::ScreenshotData); + } + Message::ScreenshotData(screenshot) => { + self.screenshot = Some(screenshot); + } + Message::Png => { + if let Some(screenshot) = &self.screenshot { + self.png_saving = true; + + return Command::perform( + save_to_png(screenshot.clone()), + Message::PngSaved, + ); + } + } + Message::PngSaved(res) => { + self.png_saving = false; + self.saved_png_path = Some(res); + } + Message::XInputChanged(new_value) => { + self.x_input_value = new_value; + } + Message::YInputChanged(new_value) => { + self.y_input_value = new_value; + } + Message::WidthInputChanged(new_value) => { + self.width_input_value = new_value; + } + Message::HeightInputChanged(new_value) => { + self.height_input_value = new_value; + } + Message::Crop => { + if let Some(screenshot) = &self.screenshot { + let cropped = screenshot.crop(Rectangle::<u32> { + x: self.x_input_value.unwrap_or(0), + y: self.y_input_value.unwrap_or(0), + width: self.width_input_value.unwrap_or(0), + height: self.height_input_value.unwrap_or(0), + }); + + match cropped { + Ok(screenshot) => { + self.screenshot = Some(screenshot); + self.crop_error = None; + } + Err(crop_error) => { + self.crop_error = Some(crop_error); + } + } + } + } + } + + Command::none() + } + + fn view(&self) -> Element<'_, Self::Message, Renderer<Self::Theme>> { + let image: Element<Message> = if let Some(screenshot) = &self.screenshot + { + image(image::Handle::from_pixels( + screenshot.size.width, + screenshot.size.height, + screenshot.clone(), + )) + .content_fit(ContentFit::Contain) + .width(Length::Fill) + .height(Length::Fill) + .into() + } else { + text("Press the button to take a screenshot!").into() + }; + + let image = container(image) + .padding(10) + .style(Container::Box) + .width(Length::FillPortion(2)) + .height(Length::Fill) + .center_x() + .center_y(); + + let crop_origin_controls = row![ + text("X:") + .vertical_alignment(alignment::Vertical::Center) + .width(30), + numeric_input("0", self.x_input_value).map(Message::XInputChanged), + text("Y:") + .vertical_alignment(alignment::Vertical::Center) + .width(30), + numeric_input("0", self.y_input_value).map(Message::YInputChanged) + ] + .spacing(10) + .align_items(Alignment::Center); + + let crop_dimension_controls = row![ + text("W:") + .vertical_alignment(alignment::Vertical::Center) + .width(30), + numeric_input("0", self.width_input_value) + .map(Message::WidthInputChanged), + text("H:") + .vertical_alignment(alignment::Vertical::Center) + .width(30), + numeric_input("0", self.height_input_value) + .map(Message::HeightInputChanged) + ] + .spacing(10) + .align_items(Alignment::Center); + + let mut crop_controls = + column![crop_origin_controls, crop_dimension_controls] + .spacing(10) + .align_items(Alignment::Center); + + if let Some(crop_error) = &self.crop_error { + crop_controls = crop_controls + .push(text(format!("Crop error! \n{}", crop_error))); + } + + let mut controls = column![ + column![ + button(centered_text("Screenshot!")) + .padding([10, 20, 10, 20]) + .width(Length::Fill) + .on_press(Message::Screenshot), + if !self.png_saving { + button(centered_text("Save as png")).on_press_maybe( + self.screenshot.is_some().then(|| Message::Png), + ) + } else { + button(centered_text("Saving...")).style(Button::Secondary) + } + .style(Button::Secondary) + .padding([10, 20, 10, 20]) + .width(Length::Fill) + ] + .spacing(10), + column![ + crop_controls, + button(centered_text("Crop")) + .on_press(Message::Crop) + .style(Button::Destructive) + .padding([10, 20, 10, 20]) + .width(Length::Fill), + ] + .spacing(10) + .align_items(Alignment::Center), + ] + .spacing(40); + + if let Some(png_result) = &self.saved_png_path { + let msg = match png_result { + Ok(path) => format!("Png saved as: {:?}!", path), + Err(msg) => { + format!("Png could not be saved due to:\n{:?}", msg) + } + }; + + controls = controls.push(text(msg)); + } + + let side_content = container(controls) + .align_x(alignment::Horizontal::Center) + .width(Length::FillPortion(1)) + .height(Length::Fill) + .center_y() + .center_x(); + + let content = row![side_content, image] + .spacing(10) + .width(Length::Fill) + .height(Length::Fill) + .align_items(Alignment::Center); + + container(content) + .width(Length::Fill) + .height(Length::Fill) + .padding(10) + .center_x() + .center_y() + .into() + } + + fn subscription(&self) -> Subscription<Self::Message> { + subscription::events_with(|event, status| { + if let event::Status::Captured = status { + return None; + } + + if let Event::Keyboard(keyboard::Event::KeyPressed { + key_code: KeyCode::F5, + .. + }) = event + { + Some(Message::Screenshot) + } else { + None + } + }) + } +} + +async fn save_to_png(screenshot: Screenshot) -> Result<String, PngError> { + let path = "screenshot.png".to_string(); + img::save_buffer( + &path, + &screenshot.bytes, + screenshot.size.width, + screenshot.size.height, + ColorType::Rgba8, + ) + .map(|_| path) + .map_err(|err| PngError(format!("{:?}", err))) +} + +#[derive(Clone, Debug)] +struct PngError(String); + +fn numeric_input( + placeholder: &str, + value: Option<u32>, +) -> Element<'_, Option<u32>> { + text_input( + placeholder, + &value + .as_ref() + .map(ToString::to_string) + .unwrap_or_else(String::new), + ) + .on_input(move |text| { + if text.is_empty() { + None + } else if let Ok(new_value) = text.parse() { + Some(new_value) + } else { + value + } + }) + .width(40) + .into() +} + +fn centered_text(content: &str) -> Element<'_, Message> { + text(content) + .width(Length::Fill) + .horizontal_alignment(alignment::Horizontal::Center) + .into() +} diff --git a/graphics/src/compositor.rs b/graphics/src/compositor.rs index d55e801a..f7b86045 100644 --- a/graphics/src/compositor.rs +++ b/graphics/src/compositor.rs @@ -59,6 +59,19 @@ pub trait Compositor: Sized { background_color: Color, overlay: &[T], ) -> Result<(), SurfaceError>; + + /// Screenshots the current [`Renderer`] primitives to an offscreen texture, and returns the bytes of + /// the texture ordered as `RGBA` in the sRGB color space. + /// + /// [`Renderer`]: Self::Renderer; + fn screenshot<T: AsRef<str>>( + &mut self, + renderer: &mut Self::Renderer, + surface: &mut Self::Surface, + viewport: &Viewport, + background_color: Color, + overlay: &[T], + ) -> Vec<u8>; } /// Result of an unsuccessful call to [`Compositor::present`]. @@ -82,7 +95,7 @@ pub enum SurfaceError { OutOfMemory, } -/// Contains informations about the graphics (e.g. graphics adapter, graphics backend). +/// Contains information about the graphics (e.g. graphics adapter, graphics backend). #[derive(Debug)] pub struct Information { /// Contains the graphics adapter. diff --git a/renderer/src/compositor.rs b/renderer/src/compositor.rs index a353b8e4..57317b28 100644 --- a/renderer/src/compositor.rs +++ b/renderer/src/compositor.rs @@ -136,6 +136,36 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> { } }) } + + fn screenshot<T: AsRef<str>>( + &mut self, + renderer: &mut Self::Renderer, + surface: &mut Self::Surface, + viewport: &Viewport, + background_color: Color, + overlay: &[T], + ) -> Vec<u8> { + renderer.with_primitives(|backend, primitives| match (self, backend, surface) { + (Self::TinySkia(_compositor), crate::Backend::TinySkia(backend), Surface::TinySkia(surface)) => { + iced_tiny_skia::window::compositor::screenshot(surface, backend, primitives, viewport, background_color, overlay) + }, + #[cfg(feature = "wgpu")] + (Self::Wgpu(compositor), crate::Backend::Wgpu(backend), Surface::Wgpu(_)) => { + iced_wgpu::window::compositor::screenshot( + compositor, + backend, + primitives, + viewport, + background_color, + overlay, + ) + }, + #[allow(unreachable_patterns)] + _ => panic!( + "The provided renderer or backend are not compatible with the compositor." + ), + }) + } } enum Candidate { diff --git a/runtime/src/window.rs b/runtime/src/window.rs index d4111293..e448edef 100644 --- a/runtime/src/window.rs +++ b/runtime/src/window.rs @@ -1,7 +1,10 @@ //! Build window-based GUI applications. mod action; +pub mod screenshot; + pub use action::Action; +pub use screenshot::Screenshot; use crate::command::{self, Command}; use crate::core::time::Instant; @@ -115,3 +118,10 @@ pub fn fetch_id<Message>( pub fn change_icon<Message>(icon: Icon) -> Command<Message> { Command::single(command::Action::Window(Action::ChangeIcon(icon))) } + +/// Captures a [`Screenshot`] from the window. +pub fn screenshot<Message>( + f: impl FnOnce(Screenshot) -> Message + Send + 'static, +) -> Command<Message> { + Command::single(command::Action::Window(Action::Screenshot(Box::new(f)))) +} diff --git a/runtime/src/window/action.rs b/runtime/src/window/action.rs index a9d2a3d0..09be1810 100644 --- a/runtime/src/window/action.rs +++ b/runtime/src/window/action.rs @@ -1,5 +1,6 @@ use crate::core::window::{Icon, Level, Mode, UserAttention}; use crate::futures::MaybeSend; +use crate::window::Screenshot; use std::fmt; @@ -89,6 +90,8 @@ pub enum Action<T> { /// - **X11:** Has no universal guidelines for icon sizes, so you're at the whims of the WM. That /// said, it's usually in the same ballpark as on Windows. ChangeIcon(Icon), + /// Screenshot the viewport of the window. + Screenshot(Box<dyn FnOnce(Screenshot) -> T + 'static>), } impl<T> Action<T> { @@ -118,6 +121,11 @@ impl<T> Action<T> { Self::ChangeLevel(level) => Action::ChangeLevel(level), Self::FetchId(o) => Action::FetchId(Box::new(move |s| f(o(s)))), Self::ChangeIcon(icon) => Action::ChangeIcon(icon), + Self::Screenshot(tag) => { + Action::Screenshot(Box::new(move |screenshot| { + f(tag(screenshot)) + })) + } } } } @@ -155,6 +163,7 @@ impl<T> fmt::Debug for Action<T> { Self::ChangeIcon(_icon) => { write!(f, "Action::ChangeIcon(icon)") } + Self::Screenshot(_) => write!(f, "Action::Screenshot"), } } } diff --git a/runtime/src/window/screenshot.rs b/runtime/src/window/screenshot.rs new file mode 100644 index 00000000..c84286b6 --- /dev/null +++ b/runtime/src/window/screenshot.rs @@ -0,0 +1,92 @@ +//! Take screenshots of a window. +use crate::core::{Rectangle, Size}; + +use std::fmt::{Debug, Formatter}; +use std::sync::Arc; + +/// Data of a screenshot, captured with `window::screenshot()`. +/// +/// The `bytes` of this screenshot will always be ordered as `RGBA` in the sRGB color space. +#[derive(Clone)] +pub struct Screenshot { + /// The bytes of the [`Screenshot`]. + pub bytes: Arc<Vec<u8>>, + /// The size of the [`Screenshot`]. + pub size: Size<u32>, +} + +impl Debug for Screenshot { + fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { + write!( + f, + "Screenshot: {{ \n bytes: {}\n size: {:?} }}", + self.bytes.len(), + self.size + ) + } +} + +impl Screenshot { + /// Creates a new [`Screenshot`]. + pub fn new(bytes: Vec<u8>, size: Size<u32>) -> Self { + Self { + bytes: Arc::new(bytes), + size, + } + } + + /// Crops a [`Screenshot`] to the provided `region`. This will always be relative to the + /// top-left corner of the [`Screenshot`]. + pub fn crop(&self, region: Rectangle<u32>) -> Result<Self, CropError> { + if region.width == 0 || region.height == 0 { + return Err(CropError::Zero); + } + + if region.x + region.width > self.size.width + || region.y + region.height > self.size.height + { + return Err(CropError::OutOfBounds); + } + + // Image is always RGBA8 = 4 bytes per pixel + const PIXEL_SIZE: usize = 4; + + let bytes_per_row = self.size.width as usize * PIXEL_SIZE; + let row_range = region.y as usize..(region.y + region.height) as usize; + let column_range = region.x as usize * PIXEL_SIZE + ..(region.x + region.width) as usize * PIXEL_SIZE; + + let chopped = self.bytes.chunks(bytes_per_row).enumerate().fold( + vec![], + |mut acc, (row, bytes)| { + if row_range.contains(&row) { + acc.extend(&bytes[column_range.clone()]); + } + + acc + }, + ); + + Ok(Self { + bytes: Arc::new(chopped), + size: Size::new(region.width, region.height), + }) + } +} + +impl AsRef<[u8]> for Screenshot { + fn as_ref(&self) -> &[u8] { + &self.bytes + } +} + +#[derive(Debug, thiserror::Error)] +/// Errors that can occur when cropping a [`Screenshot`]. +pub enum CropError { + #[error("The cropped region is out of bounds.")] + /// The cropped region's size is out of bounds. + OutOfBounds, + #[error("The cropped region is not visible.")] + /// The cropped region's size is zero. + Zero, +} @@ -278,6 +278,7 @@ pub mod widget { mod native {} mod renderer {} mod style {} + mod runtime {} } pub use application::Application; diff --git a/tiny_skia/src/window/compositor.rs b/tiny_skia/src/window/compositor.rs index 9999a188..f3be3f16 100644 --- a/tiny_skia/src/window/compositor.rs +++ b/tiny_skia/src/window/compositor.rs @@ -1,5 +1,5 @@ -use crate::core::{Color, Rectangle}; -use crate::graphics::compositor::{self, Information, SurfaceError}; +use crate::core::{Color, Rectangle, Size}; +use crate::graphics::compositor::{self, Information}; use crate::graphics::damage; use crate::graphics::{Error, Primitive, Viewport}; use crate::{Backend, Renderer, Settings}; @@ -79,7 +79,7 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> { viewport: &Viewport, background_color: Color, overlay: &[T], - ) -> Result<(), SurfaceError> { + ) -> Result<(), compositor::SurfaceError> { renderer.with_primitives(|backend, primitives| { present( backend, @@ -91,6 +91,26 @@ impl<Theme> crate::graphics::Compositor for Compositor<Theme> { ) }) } + + fn screenshot<T: AsRef<str>>( + &mut self, + renderer: &mut Self::Renderer, + surface: &mut Self::Surface, + viewport: &Viewport, + background_color: Color, + overlay: &[T], + ) -> Vec<u8> { + renderer.with_primitives(|backend, primitives| { + screenshot( + surface, + backend, + primitives, + viewport, + background_color, + overlay, + ) + }) + } } pub fn new<Theme>(settings: Settings) -> (Compositor<Theme>, Backend) { @@ -156,3 +176,53 @@ pub fn present<T: AsRef<str>>( Ok(()) } + +pub fn screenshot<T: AsRef<str>>( + surface: &mut Surface, + backend: &mut Backend, + primitives: &[Primitive], + viewport: &Viewport, + background_color: Color, + overlay: &[T], +) -> Vec<u8> { + let size = viewport.physical_size(); + + let mut offscreen_buffer: Vec<u32> = + vec![0; size.width as usize * size.height as usize]; + + backend.draw( + &mut tiny_skia::PixmapMut::from_bytes( + bytemuck::cast_slice_mut(&mut offscreen_buffer), + size.width, + size.height, + ) + .expect("Create offscreen pixel map"), + &mut surface.clip_mask, + primitives, + viewport, + &[Rectangle::with_size(Size::new( + size.width as f32, + size.height as f32, + ))], + background_color, + overlay, + ); + + offscreen_buffer.iter().fold( + Vec::with_capacity(offscreen_buffer.len() * 4), + |mut acc, pixel| { + const A_MASK: u32 = 0xFF_00_00_00; + const R_MASK: u32 = 0x00_FF_00_00; + const G_MASK: u32 = 0x00_00_FF_00; + const B_MASK: u32 = 0x00_00_00_FF; + + let a = ((A_MASK & pixel) >> 24) as u8; + let r = ((R_MASK & pixel) >> 16) as u8; + let g = ((G_MASK & pixel) >> 8) as u8; + let b = (B_MASK & pixel) as u8; + + acc.extend([r, g, b, a]); + acc + }, + ) +} diff --git a/wgpu/src/color.rs b/wgpu/src/color.rs new file mode 100644 index 00000000..a1025601 --- /dev/null +++ b/wgpu/src/color.rs @@ -0,0 +1,165 @@ +use std::borrow::Cow; + +pub fn convert( + device: &wgpu::Device, + encoder: &mut wgpu::CommandEncoder, + source: wgpu::Texture, + format: wgpu::TextureFormat, +) -> wgpu::Texture { + if source.format() == format { + return source; + } + + let sampler = device.create_sampler(&wgpu::SamplerDescriptor { + label: Some("iced_wgpu.offscreen.sampler"), + ..Default::default() + }); + + //sampler in 0 + let sampler_layout = + device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor { + label: Some("iced_wgpu.offscreen.blit.sampler_layout"), + entries: &[wgpu::BindGroupLayoutEntry { + binding: 0, + visibility: wgpu::ShaderStages::FRAGMENT, + ty: wgpu::BindingType::Sampler( + wgpu::SamplerBindingType::NonFiltering, + ), + count: None, + }], + }); + + let sampler_bind_group = + device.create_bind_group(&wgpu::BindGroupDescriptor { + label: Some("iced_wgpu.offscreen.sampler.bind_group"), + layout: &sampler_layout, + entries: &[wgpu::BindGroupEntry { + binding: 0, + resource: wgpu::BindingResource::Sampler(&sampler), + }], + }); + + let texture_layout = + device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor { + label: Some("iced_wgpu.offscreen.blit.texture_layout"), + entries: &[wgpu::BindGroupLayoutEntry { + binding: 0, + visibility: wgpu::ShaderStages::FRAGMENT, + ty: wgpu::BindingType::Texture { + sample_type: wgpu::TextureSampleType::Float { + filterable: false, + }, + view_dimension: wgpu::TextureViewDimension::D2, + multisampled: false, + }, + count: None, + }], + }); + + let pipeline_layout = + device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor { + label: Some("iced_wgpu.offscreen.blit.pipeline_layout"), + bind_group_layouts: &[&sampler_layout, &texture_layout], + push_constant_ranges: &[], + }); + + let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor { + label: Some("iced_wgpu.offscreen.blit.shader"), + source: wgpu::ShaderSource::Wgsl(Cow::Borrowed(include_str!( + "shader/blit.wgsl" + ))), + }); + + let pipeline = + device.create_render_pipeline(&wgpu::RenderPipelineDescriptor { + label: Some("iced_wgpu.offscreen.blit.pipeline"), + layout: Some(&pipeline_layout), + vertex: wgpu::VertexState { + module: &shader, + entry_point: "vs_main", + buffers: &[], + }, + fragment: Some(wgpu::FragmentState { + module: &shader, + entry_point: "fs_main", + targets: &[Some(wgpu::ColorTargetState { + format, + blend: Some(wgpu::BlendState { + color: wgpu::BlendComponent { + src_factor: wgpu::BlendFactor::SrcAlpha, + dst_factor: wgpu::BlendFactor::OneMinusSrcAlpha, + operation: wgpu::BlendOperation::Add, + }, + alpha: wgpu::BlendComponent { + src_factor: wgpu::BlendFactor::One, + dst_factor: wgpu::BlendFactor::OneMinusSrcAlpha, + operation: wgpu::BlendOperation::Add, + }, + }), + write_mask: wgpu::ColorWrites::ALL, + })], + }), + primitive: wgpu::PrimitiveState { + topology: wgpu::PrimitiveTopology::TriangleList, + front_face: wgpu::FrontFace::Cw, + ..Default::default() + }, + depth_stencil: None, + multisample: Default::default(), + multiview: None, + }); + + let texture = device.create_texture(&wgpu::TextureDescriptor { + label: Some("iced_wgpu.offscreen.conversion.source_texture"), + size: source.size(), + mip_level_count: 1, + sample_count: 1, + dimension: wgpu::TextureDimension::D2, + format, + usage: wgpu::TextureUsages::RENDER_ATTACHMENT + | wgpu::TextureUsages::COPY_SRC, + view_formats: &[], + }); + + let view = &texture.create_view(&wgpu::TextureViewDescriptor::default()); + + let texture_bind_group = + device.create_bind_group(&wgpu::BindGroupDescriptor { + label: Some("iced_wgpu.offscreen.blit.texture_bind_group"), + layout: &texture_layout, + entries: &[wgpu::BindGroupEntry { + binding: 0, + resource: wgpu::BindingResource::TextureView( + &source + .create_view(&wgpu::TextureViewDescriptor::default()), + ), + }], + }); + + let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor { + label: Some("iced_wgpu.offscreen.blit.render_pass"), + color_attachments: &[Some(wgpu::RenderPassColorAttachment { + view, + resolve_target: None, + ops: wgpu::Operations { + load: wgpu::LoadOp::Load, + store: true, + }, + })], + depth_stencil_attachment: None, + }); + + pass.set_pipeline(&pipeline); + pass.set_bind_group(0, &sampler_bind_group, &[]); + pass.set_bind_group(1, &texture_bind_group, &[]); + pass.draw(0..6, 0..1); + + texture +} + +#[derive(Debug, Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)] +#[repr(C)] +struct Vertex { + ndc: [f32; 2], + uv: [f32; 2], +} diff --git a/wgpu/src/lib.rs b/wgpu/src/lib.rs index 0a5726b5..86a962a5 100644 --- a/wgpu/src/lib.rs +++ b/wgpu/src/lib.rs @@ -46,6 +46,7 @@ pub mod geometry; mod backend; mod buffer; +mod color; mod quad; mod text; mod triangle; diff --git a/wgpu/src/triangle/msaa.rs b/wgpu/src/triangle/msaa.rs index 4afbdb32..320b5b12 100644 --- a/wgpu/src/triangle/msaa.rs +++ b/wgpu/src/triangle/msaa.rs @@ -16,15 +16,8 @@ impl Blit { format: wgpu::TextureFormat, antialiasing: graphics::Antialiasing, ) -> Blit { - let sampler = 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::Nearest, - min_filter: wgpu::FilterMode::Nearest, - mipmap_filter: wgpu::FilterMode::Nearest, - ..Default::default() - }); + let sampler = + device.create_sampler(&wgpu::SamplerDescriptor::default()); let constant_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor { diff --git a/wgpu/src/window/compositor.rs b/wgpu/src/window/compositor.rs index 2eaafde0..1cfd7b67 100644 --- a/wgpu/src/window/compositor.rs +++ b/wgpu/src/window/compositor.rs @@ -1,5 +1,5 @@ //! Connect a window with a renderer. -use crate::core::Color; +use crate::core::{Color, Size}; use crate::graphics; use crate::graphics::color; use crate::graphics::compositor; @@ -283,4 +283,154 @@ impl<Theme> graphics::Compositor for Compositor<Theme> { ) }) } + + fn screenshot<T: AsRef<str>>( + &mut self, + renderer: &mut Self::Renderer, + _surface: &mut Self::Surface, + viewport: &Viewport, + background_color: Color, + overlay: &[T], + ) -> Vec<u8> { + renderer.with_primitives(|backend, primitives| { + screenshot( + self, + backend, + primitives, + viewport, + background_color, + overlay, + ) + }) + } +} + +/// Renders the current surface to an offscreen buffer. +/// +/// Returns RGBA bytes of the texture data. +pub fn screenshot<Theme, T: AsRef<str>>( + compositor: &Compositor<Theme>, + backend: &mut Backend, + primitives: &[Primitive], + viewport: &Viewport, + background_color: Color, + overlay: &[T], +) -> Vec<u8> { + let mut encoder = compositor.device.create_command_encoder( + &wgpu::CommandEncoderDescriptor { + label: Some("iced_wgpu.offscreen.encoder"), + }, + ); + + let dimensions = BufferDimensions::new(viewport.physical_size()); + + let texture_extent = wgpu::Extent3d { + width: dimensions.width, + height: dimensions.height, + depth_or_array_layers: 1, + }; + + let texture = compositor.device.create_texture(&wgpu::TextureDescriptor { + label: Some("iced_wgpu.offscreen.source_texture"), + size: texture_extent, + mip_level_count: 1, + sample_count: 1, + dimension: wgpu::TextureDimension::D2, + format: compositor.format, + usage: wgpu::TextureUsages::RENDER_ATTACHMENT + | wgpu::TextureUsages::COPY_SRC + | wgpu::TextureUsages::TEXTURE_BINDING, + view_formats: &[], + }); + + let view = texture.create_view(&wgpu::TextureViewDescriptor::default()); + + backend.present( + &compositor.device, + &compositor.queue, + &mut encoder, + Some(background_color), + &view, + primitives, + viewport, + overlay, + ); + + let texture = crate::color::convert( + &compositor.device, + &mut encoder, + texture, + if color::GAMMA_CORRECTION { + wgpu::TextureFormat::Rgba8UnormSrgb + } else { + wgpu::TextureFormat::Rgba8Unorm + }, + ); + + let output_buffer = + compositor.device.create_buffer(&wgpu::BufferDescriptor { + label: Some("iced_wgpu.offscreen.output_texture_buffer"), + size: (dimensions.padded_bytes_per_row * dimensions.height as usize) + as u64, + usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST, + mapped_at_creation: false, + }); + + encoder.copy_texture_to_buffer( + texture.as_image_copy(), + wgpu::ImageCopyBuffer { + buffer: &output_buffer, + layout: wgpu::ImageDataLayout { + offset: 0, + bytes_per_row: Some(dimensions.padded_bytes_per_row as u32), + rows_per_image: None, + }, + }, + texture_extent, + ); + + let index = compositor.queue.submit(Some(encoder.finish())); + + let slice = output_buffer.slice(..); + slice.map_async(wgpu::MapMode::Read, |_| {}); + + let _ = compositor + .device + .poll(wgpu::Maintain::WaitForSubmissionIndex(index)); + + let mapped_buffer = slice.get_mapped_range(); + + mapped_buffer.chunks(dimensions.padded_bytes_per_row).fold( + vec![], + |mut acc, row| { + acc.extend(&row[..dimensions.unpadded_bytes_per_row]); + acc + }, + ) +} + +#[derive(Clone, Copy, Debug)] +struct BufferDimensions { + width: u32, + height: u32, + unpadded_bytes_per_row: usize, + padded_bytes_per_row: usize, +} + +impl BufferDimensions { + fn new(size: Size<u32>) -> Self { + let unpadded_bytes_per_row = size.width as usize * 4; //slice of buffer per row; always RGBA + let alignment = wgpu::COPY_BYTES_PER_ROW_ALIGNMENT as usize; //256 + let padded_bytes_per_row_padding = + (alignment - unpadded_bytes_per_row % alignment) % alignment; + let padded_bytes_per_row = + unpadded_bytes_per_row + padded_bytes_per_row_padding; + + Self { + width: size.width, + height: size.height, + unpadded_bytes_per_row, + padded_bytes_per_row, + } + } } diff --git a/widget/src/button.rs b/widget/src/button.rs index 0f3cbde2..8ebc9657 100644 --- a/widget/src/button.rs +++ b/widget/src/button.rs @@ -102,8 +102,17 @@ where /// Sets the message that will be produced when the [`Button`] is pressed. /// /// Unless `on_press` is called, the [`Button`] will be disabled. - pub fn on_press(mut self, msg: Message) -> Self { - self.on_press = Some(msg); + pub fn on_press(mut self, on_press: Message) -> Self { + self.on_press = Some(on_press); + self + } + + /// Sets the message that will be produced when the [`Button`] is pressed, + /// if `Some`. + /// + /// If `None`, the [`Button`] will be disabled. + pub fn on_press_maybe(mut self, on_press: Option<Message>) -> Self { + self.on_press = on_press; self } diff --git a/winit/src/application.rs b/winit/src/application.rs index be416ac8..6e7b94ef 100644 --- a/winit/src/application.rs +++ b/winit/src/application.rs @@ -308,6 +308,8 @@ async fn run_instance<A, E, C>( run_command( &application, + &mut compositor, + &mut surface, &mut cache, &state, &mut renderer, @@ -318,7 +320,6 @@ async fn run_instance<A, E, C>( &mut proxy, &mut debug, &window, - || compositor.fetch_information(), ); runtime.track(application.subscription().into_recipes()); @@ -382,6 +383,8 @@ async fn run_instance<A, E, C>( // Update application update( &mut application, + &mut compositor, + &mut surface, &mut cache, &state, &mut renderer, @@ -392,7 +395,6 @@ async fn run_instance<A, E, C>( &mut debug, &mut messages, &window, - || compositor.fetch_information(), ); // Update window @@ -645,8 +647,10 @@ where /// Updates an [`Application`] by feeding it the provided messages, spawning any /// resulting [`Command`], and tracking its [`Subscription`]. -pub fn update<A: Application, E: Executor>( +pub fn update<A: Application, C, E: Executor>( application: &mut A, + compositor: &mut C, + surface: &mut C::Surface, cache: &mut user_interface::Cache, state: &State<A>, renderer: &mut A::Renderer, @@ -657,8 +661,8 @@ pub fn update<A: Application, E: Executor>( debug: &mut Debug, messages: &mut Vec<A::Message>, window: &winit::window::Window, - graphics_info: impl FnOnce() -> compositor::Information + Copy, ) where + C: Compositor<Renderer = A::Renderer> + 'static, <A::Renderer as core::Renderer>::Theme: StyleSheet, { for message in messages.drain(..) { @@ -676,6 +680,8 @@ pub fn update<A: Application, E: Executor>( run_command( application, + compositor, + surface, cache, state, renderer, @@ -686,7 +692,6 @@ pub fn update<A: Application, E: Executor>( proxy, debug, window, - graphics_info, ); } @@ -695,8 +700,10 @@ pub fn update<A: Application, E: Executor>( } /// Runs the actions of a [`Command`]. -pub fn run_command<A, E>( +pub fn run_command<A, C, E>( application: &A, + compositor: &mut C, + surface: &mut C::Surface, cache: &mut user_interface::Cache, state: &State<A>, renderer: &mut A::Renderer, @@ -707,10 +714,10 @@ pub fn run_command<A, E>( proxy: &mut winit::event_loop::EventLoopProxy<A::Message>, debug: &mut Debug, window: &winit::window::Window, - _graphics_info: impl FnOnce() -> compositor::Information + Copy, ) where A: Application, E: Executor, + C: Compositor<Renderer = A::Renderer> + 'static, <A::Renderer as core::Renderer>::Theme: StyleSheet, { use crate::runtime::command; @@ -802,12 +809,28 @@ pub fn run_command<A, E>( .send_event(tag(window.id().into())) .expect("Send message to event loop"); } + window::Action::Screenshot(tag) => { + let bytes = compositor.screenshot( + renderer, + surface, + state.viewport(), + state.background_color(), + &debug.overlay(), + ); + + proxy + .send_event(tag(window::Screenshot::new( + bytes, + state.physical_size(), + ))) + .expect("Send message to event loop.") + } }, command::Action::System(action) => match action { system::Action::QueryInformation(_tag) => { #[cfg(feature = "system")] { - let graphics_info = _graphics_info(); + let graphics_info = compositor.fetch_information(); let proxy = proxy.clone(); let _ = std::thread::spawn(move || { |