b31f893408
This allows debugging Zed with Renderdoc, and also fixes an issue where glyphs' bounds were miscalculated for certain sizes and scale factors. Release Notes: - N/A --------- Co-authored-by: Kate <kate@zed.dev> Co-authored-by: Julia <julia@zed.dev> Co-authored-by: Junkui Zhang <364772080@qq.com>
1955 lines
66 KiB
Rust
1955 lines
66 KiB
Rust
use std::{borrow::Cow, sync::Arc};
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use ::util::ResultExt;
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use anyhow::Result;
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use collections::HashMap;
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use itertools::Itertools;
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use parking_lot::{RwLock, RwLockUpgradableReadGuard};
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use windows::{
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Win32::{
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Foundation::*,
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Globalization::GetUserDefaultLocaleName,
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Graphics::{
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Direct3D::D3D_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP,
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Direct3D11::*,
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DirectWrite::*,
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Dxgi::Common::*,
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Gdi::{IsRectEmpty, LOGFONTW},
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Imaging::*,
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},
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System::SystemServices::LOCALE_NAME_MAX_LENGTH,
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UI::WindowsAndMessaging::*,
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},
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core::*,
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};
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use windows_numerics::Vector2;
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use crate::*;
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#[derive(Debug)]
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struct FontInfo {
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font_family: String,
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font_face: IDWriteFontFace3,
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features: IDWriteTypography,
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fallbacks: Option<IDWriteFontFallback>,
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is_system_font: bool,
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}
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pub(crate) struct DirectWriteTextSystem(RwLock<DirectWriteState>);
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struct DirectWriteComponent {
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locale: String,
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factory: IDWriteFactory5,
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bitmap_factory: AgileReference<IWICImagingFactory>,
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in_memory_loader: IDWriteInMemoryFontFileLoader,
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builder: IDWriteFontSetBuilder1,
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text_renderer: Arc<TextRendererWrapper>,
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render_params: IDWriteRenderingParams3,
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gpu_state: GPUState,
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}
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struct GPUState {
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device: ID3D11Device,
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device_context: ID3D11DeviceContext,
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sampler: [Option<ID3D11SamplerState>; 1],
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blend_state: ID3D11BlendState,
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vertex_shader: ID3D11VertexShader,
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pixel_shader: ID3D11PixelShader,
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}
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struct DirectWriteState {
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components: DirectWriteComponent,
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system_ui_font_name: SharedString,
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system_font_collection: IDWriteFontCollection1,
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custom_font_collection: IDWriteFontCollection1,
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fonts: Vec<FontInfo>,
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font_selections: HashMap<Font, FontId>,
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font_id_by_identifier: HashMap<FontIdentifier, FontId>,
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}
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#[derive(Debug, Clone, Hash, PartialEq, Eq)]
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struct FontIdentifier {
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postscript_name: String,
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weight: i32,
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style: i32,
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}
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impl DirectWriteComponent {
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pub fn new(bitmap_factory: &IWICImagingFactory, gpu_context: &DirectXDevices) -> Result<Self> {
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// todo: ideally this would not be a large unsafe block but smaller isolated ones for easier auditing
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unsafe {
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let factory: IDWriteFactory5 = DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED)?;
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let bitmap_factory = AgileReference::new(bitmap_factory)?;
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// The `IDWriteInMemoryFontFileLoader` here is supported starting from
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// Windows 10 Creators Update, which consequently requires the entire
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// `DirectWriteTextSystem` to run on `win10 1703`+.
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let in_memory_loader = factory.CreateInMemoryFontFileLoader()?;
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factory.RegisterFontFileLoader(&in_memory_loader)?;
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let builder = factory.CreateFontSetBuilder()?;
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let mut locale_vec = vec![0u16; LOCALE_NAME_MAX_LENGTH as usize];
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GetUserDefaultLocaleName(&mut locale_vec);
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let locale = String::from_utf16_lossy(&locale_vec);
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let text_renderer = Arc::new(TextRendererWrapper::new(&locale));
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let render_params = {
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let default_params: IDWriteRenderingParams3 =
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factory.CreateRenderingParams()?.cast()?;
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let gamma = default_params.GetGamma();
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let enhanced_contrast = default_params.GetEnhancedContrast();
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let gray_contrast = default_params.GetGrayscaleEnhancedContrast();
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let cleartype_level = default_params.GetClearTypeLevel();
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let grid_fit_mode = default_params.GetGridFitMode();
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factory.CreateCustomRenderingParams(
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gamma,
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enhanced_contrast,
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gray_contrast,
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cleartype_level,
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DWRITE_PIXEL_GEOMETRY_RGB,
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DWRITE_RENDERING_MODE1_NATURAL_SYMMETRIC,
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grid_fit_mode,
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)?
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};
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let gpu_state = GPUState::new(gpu_context)?;
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Ok(DirectWriteComponent {
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locale,
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factory,
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bitmap_factory,
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in_memory_loader,
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builder,
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text_renderer,
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render_params,
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gpu_state,
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})
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}
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}
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}
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impl GPUState {
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fn new(gpu_context: &DirectXDevices) -> Result<Self> {
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let device = gpu_context.device.clone();
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let device_context = gpu_context.device_context.clone();
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let blend_state = {
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let mut blend_state = None;
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let desc = D3D11_BLEND_DESC {
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AlphaToCoverageEnable: false.into(),
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IndependentBlendEnable: false.into(),
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RenderTarget: [
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D3D11_RENDER_TARGET_BLEND_DESC {
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BlendEnable: true.into(),
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SrcBlend: D3D11_BLEND_SRC_ALPHA,
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DestBlend: D3D11_BLEND_INV_SRC_ALPHA,
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BlendOp: D3D11_BLEND_OP_ADD,
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SrcBlendAlpha: D3D11_BLEND_SRC_ALPHA,
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DestBlendAlpha: D3D11_BLEND_INV_SRC_ALPHA,
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BlendOpAlpha: D3D11_BLEND_OP_ADD,
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RenderTargetWriteMask: D3D11_COLOR_WRITE_ENABLE_ALL.0 as u8,
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},
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Default::default(),
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Default::default(),
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Default::default(),
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Default::default(),
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Default::default(),
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Default::default(),
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Default::default(),
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],
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};
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unsafe { device.CreateBlendState(&desc, Some(&mut blend_state)) }?;
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blend_state.unwrap()
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};
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let sampler = {
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let mut sampler = None;
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let desc = D3D11_SAMPLER_DESC {
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Filter: D3D11_FILTER_MIN_MAG_MIP_POINT,
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AddressU: D3D11_TEXTURE_ADDRESS_BORDER,
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AddressV: D3D11_TEXTURE_ADDRESS_BORDER,
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AddressW: D3D11_TEXTURE_ADDRESS_BORDER,
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MipLODBias: 0.0,
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MaxAnisotropy: 1,
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ComparisonFunc: D3D11_COMPARISON_ALWAYS,
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BorderColor: [0.0, 0.0, 0.0, 0.0],
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MinLOD: 0.0,
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MaxLOD: 0.0,
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};
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unsafe { device.CreateSamplerState(&desc, Some(&mut sampler)) }?;
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[sampler]
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};
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let vertex_shader = {
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let source = shader_resources::RawShaderBytes::new(
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shader_resources::ShaderModule::EmojiRasterization,
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shader_resources::ShaderTarget::Vertex,
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)?;
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let mut shader = None;
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unsafe { device.CreateVertexShader(source.as_bytes(), None, Some(&mut shader)) }?;
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shader.unwrap()
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};
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let pixel_shader = {
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let source = shader_resources::RawShaderBytes::new(
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shader_resources::ShaderModule::EmojiRasterization,
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shader_resources::ShaderTarget::Fragment,
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)?;
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let mut shader = None;
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unsafe { device.CreatePixelShader(source.as_bytes(), None, Some(&mut shader)) }?;
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shader.unwrap()
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};
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Ok(Self {
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device,
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device_context,
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sampler,
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blend_state,
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vertex_shader,
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pixel_shader,
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})
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}
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}
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impl DirectWriteTextSystem {
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pub(crate) fn new(
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gpu_context: &DirectXDevices,
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bitmap_factory: &IWICImagingFactory,
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) -> Result<Self> {
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let components = DirectWriteComponent::new(bitmap_factory, gpu_context)?;
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let system_font_collection = unsafe {
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let mut result = std::mem::zeroed();
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components
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.factory
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.GetSystemFontCollection(false, &mut result, true)?;
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result.unwrap()
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};
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let custom_font_set = unsafe { components.builder.CreateFontSet()? };
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let custom_font_collection = unsafe {
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components
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.factory
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.CreateFontCollectionFromFontSet(&custom_font_set)?
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};
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let system_ui_font_name = get_system_ui_font_name();
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Ok(Self(RwLock::new(DirectWriteState {
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components,
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system_ui_font_name,
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system_font_collection,
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custom_font_collection,
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fonts: Vec::new(),
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font_selections: HashMap::default(),
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font_id_by_identifier: HashMap::default(),
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})))
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}
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}
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impl PlatformTextSystem for DirectWriteTextSystem {
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fn add_fonts(&self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()> {
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self.0.write().add_fonts(fonts)
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}
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fn all_font_names(&self) -> Vec<String> {
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self.0.read().all_font_names()
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}
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fn font_id(&self, font: &Font) -> Result<FontId> {
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let lock = self.0.upgradable_read();
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if let Some(font_id) = lock.font_selections.get(font) {
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Ok(*font_id)
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} else {
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let mut lock = RwLockUpgradableReadGuard::upgrade(lock);
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let font_id = lock.select_font(font);
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lock.font_selections.insert(font.clone(), font_id);
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Ok(font_id)
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}
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}
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fn font_metrics(&self, font_id: FontId) -> FontMetrics {
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self.0.read().font_metrics(font_id)
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}
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fn typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Bounds<f32>> {
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self.0.read().get_typographic_bounds(font_id, glyph_id)
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}
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fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> anyhow::Result<Size<f32>> {
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self.0.read().get_advance(font_id, glyph_id)
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}
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fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId> {
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self.0.read().glyph_for_char(font_id, ch)
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}
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fn glyph_raster_bounds(
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&self,
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params: &RenderGlyphParams,
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) -> anyhow::Result<Bounds<DevicePixels>> {
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self.0.read().raster_bounds(params)
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}
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fn rasterize_glyph(
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&self,
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params: &RenderGlyphParams,
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raster_bounds: Bounds<DevicePixels>,
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) -> anyhow::Result<(Size<DevicePixels>, Vec<u8>)> {
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self.0.read().rasterize_glyph(params, raster_bounds)
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}
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fn layout_line(&self, text: &str, font_size: Pixels, runs: &[FontRun]) -> LineLayout {
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self.0
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.write()
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.layout_line(text, font_size, runs)
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.log_err()
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.unwrap_or(LineLayout {
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font_size,
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..Default::default()
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})
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}
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}
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impl DirectWriteState {
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fn add_fonts(&mut self, fonts: Vec<Cow<'static, [u8]>>) -> Result<()> {
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for font_data in fonts {
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match font_data {
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Cow::Borrowed(data) => unsafe {
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let font_file = self
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.components
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.in_memory_loader
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.CreateInMemoryFontFileReference(
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&self.components.factory,
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data.as_ptr() as _,
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data.len() as _,
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None,
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)?;
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self.components.builder.AddFontFile(&font_file)?;
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},
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Cow::Owned(data) => unsafe {
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let font_file = self
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.components
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.in_memory_loader
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.CreateInMemoryFontFileReference(
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&self.components.factory,
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data.as_ptr() as _,
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data.len() as _,
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None,
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)?;
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self.components.builder.AddFontFile(&font_file)?;
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},
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}
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}
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let set = unsafe { self.components.builder.CreateFontSet()? };
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let collection = unsafe {
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self.components
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.factory
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.CreateFontCollectionFromFontSet(&set)?
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};
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self.custom_font_collection = collection;
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Ok(())
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}
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fn generate_font_fallbacks(
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&self,
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fallbacks: &FontFallbacks,
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) -> Result<Option<IDWriteFontFallback>> {
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if fallbacks.fallback_list().is_empty() {
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return Ok(None);
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}
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unsafe {
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let builder = self.components.factory.CreateFontFallbackBuilder()?;
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let font_set = &self.system_font_collection.GetFontSet()?;
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for family_name in fallbacks.fallback_list() {
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let Some(fonts) = font_set
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.GetMatchingFonts(
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&HSTRING::from(family_name),
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DWRITE_FONT_WEIGHT_NORMAL,
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DWRITE_FONT_STRETCH_NORMAL,
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DWRITE_FONT_STYLE_NORMAL,
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)
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.log_err()
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else {
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continue;
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};
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if fonts.GetFontCount() == 0 {
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log::error!("No matching font found for {}", family_name);
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continue;
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}
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let font = fonts.GetFontFaceReference(0)?.CreateFontFace()?;
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let mut count = 0;
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font.GetUnicodeRanges(None, &mut count).ok();
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if count == 0 {
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continue;
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}
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let mut unicode_ranges = vec![DWRITE_UNICODE_RANGE::default(); count as usize];
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let Some(_) = font
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.GetUnicodeRanges(Some(&mut unicode_ranges), &mut count)
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.log_err()
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else {
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continue;
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};
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let target_family_name = HSTRING::from(family_name);
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builder.AddMapping(
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&unicode_ranges,
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&[target_family_name.as_ptr()],
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None,
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None,
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None,
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1.0,
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)?;
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}
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let system_fallbacks = self.components.factory.GetSystemFontFallback()?;
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builder.AddMappings(&system_fallbacks)?;
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Ok(Some(builder.CreateFontFallback()?))
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}
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}
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unsafe fn generate_font_features(
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&self,
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font_features: &FontFeatures,
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) -> Result<IDWriteTypography> {
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let direct_write_features = unsafe { self.components.factory.CreateTypography()? };
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apply_font_features(&direct_write_features, font_features)?;
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Ok(direct_write_features)
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}
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unsafe fn get_font_id_from_font_collection(
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&mut self,
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family_name: &str,
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font_weight: FontWeight,
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font_style: FontStyle,
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font_features: &FontFeatures,
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font_fallbacks: Option<&FontFallbacks>,
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is_system_font: bool,
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) -> Option<FontId> {
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let collection = if is_system_font {
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&self.system_font_collection
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} else {
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&self.custom_font_collection
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};
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let fontset = unsafe { collection.GetFontSet().log_err()? };
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let font = unsafe {
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fontset
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.GetMatchingFonts(
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&HSTRING::from(family_name),
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font_weight.into(),
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DWRITE_FONT_STRETCH_NORMAL,
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font_style.into(),
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)
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.log_err()?
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};
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let total_number = unsafe { font.GetFontCount() };
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for index in 0..total_number {
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let Some(font_face_ref) = (unsafe { font.GetFontFaceReference(index).log_err() })
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else {
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continue;
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};
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let Some(font_face) = (unsafe { font_face_ref.CreateFontFace().log_err() }) else {
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continue;
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};
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let Some(identifier) = get_font_identifier(&font_face, &self.components.locale) else {
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continue;
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};
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let Some(direct_write_features) =
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(unsafe { self.generate_font_features(font_features).log_err() })
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else {
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continue;
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};
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let fallbacks = font_fallbacks
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.and_then(|fallbacks| self.generate_font_fallbacks(fallbacks).log_err().flatten());
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let font_info = FontInfo {
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font_family: family_name.to_owned(),
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font_face,
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features: direct_write_features,
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fallbacks,
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is_system_font,
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};
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let font_id = FontId(self.fonts.len());
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self.fonts.push(font_info);
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self.font_id_by_identifier.insert(identifier, font_id);
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return Some(font_id);
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}
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None
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}
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unsafe fn update_system_font_collection(&mut self) {
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let mut collection = unsafe { std::mem::zeroed() };
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if unsafe {
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self.components
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.factory
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.GetSystemFontCollection(false, &mut collection, true)
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.log_err()
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.is_some()
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} {
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self.system_font_collection = collection.unwrap();
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}
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}
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fn select_font(&mut self, target_font: &Font) -> FontId {
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unsafe {
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if target_font.family == ".SystemUIFont" {
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let family = self.system_ui_font_name.clone();
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self.find_font_id(
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family.as_ref(),
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target_font.weight,
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target_font.style,
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&target_font.features,
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target_font.fallbacks.as_ref(),
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)
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.unwrap()
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} else {
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self.find_font_id(
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target_font.family.as_ref(),
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target_font.weight,
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target_font.style,
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&target_font.features,
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target_font.fallbacks.as_ref(),
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)
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.unwrap_or_else(|| {
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#[cfg(any(test, feature = "test-support"))]
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{
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panic!("ERROR: {} font not found!", target_font.family);
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}
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#[cfg(not(any(test, feature = "test-support")))]
|
|
{
|
|
let family = self.system_ui_font_name.clone();
|
|
log::error!("{} not found, use {} instead.", target_font.family, family);
|
|
self.get_font_id_from_font_collection(
|
|
family.as_ref(),
|
|
target_font.weight,
|
|
target_font.style,
|
|
&target_font.features,
|
|
target_font.fallbacks.as_ref(),
|
|
true,
|
|
)
|
|
.unwrap()
|
|
}
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
unsafe fn find_font_id(
|
|
&mut self,
|
|
family_name: &str,
|
|
weight: FontWeight,
|
|
style: FontStyle,
|
|
features: &FontFeatures,
|
|
fallbacks: Option<&FontFallbacks>,
|
|
) -> Option<FontId> {
|
|
// try to find target font in custom font collection first
|
|
unsafe {
|
|
self.get_font_id_from_font_collection(
|
|
family_name,
|
|
weight,
|
|
style,
|
|
features,
|
|
fallbacks,
|
|
false,
|
|
)
|
|
.or_else(|| {
|
|
self.get_font_id_from_font_collection(
|
|
family_name,
|
|
weight,
|
|
style,
|
|
features,
|
|
fallbacks,
|
|
true,
|
|
)
|
|
})
|
|
.or_else(|| {
|
|
self.update_system_font_collection();
|
|
self.get_font_id_from_font_collection(
|
|
family_name,
|
|
weight,
|
|
style,
|
|
features,
|
|
fallbacks,
|
|
true,
|
|
)
|
|
})
|
|
}
|
|
}
|
|
|
|
fn layout_line(
|
|
&mut self,
|
|
text: &str,
|
|
font_size: Pixels,
|
|
font_runs: &[FontRun],
|
|
) -> Result<LineLayout> {
|
|
if font_runs.is_empty() {
|
|
return Ok(LineLayout {
|
|
font_size,
|
|
..Default::default()
|
|
});
|
|
}
|
|
unsafe {
|
|
let text_renderer = self.components.text_renderer.clone();
|
|
let text_wide = text.encode_utf16().collect_vec();
|
|
|
|
let mut utf8_offset = 0usize;
|
|
let mut utf16_offset = 0u32;
|
|
let text_layout = {
|
|
let first_run = &font_runs[0];
|
|
let font_info = &self.fonts[first_run.font_id.0];
|
|
let collection = if font_info.is_system_font {
|
|
&self.system_font_collection
|
|
} else {
|
|
&self.custom_font_collection
|
|
};
|
|
let format: IDWriteTextFormat1 = self
|
|
.components
|
|
.factory
|
|
.CreateTextFormat(
|
|
&HSTRING::from(&font_info.font_family),
|
|
collection,
|
|
font_info.font_face.GetWeight(),
|
|
font_info.font_face.GetStyle(),
|
|
DWRITE_FONT_STRETCH_NORMAL,
|
|
font_size.0,
|
|
&HSTRING::from(&self.components.locale),
|
|
)?
|
|
.cast()?;
|
|
if let Some(ref fallbacks) = font_info.fallbacks {
|
|
format.SetFontFallback(fallbacks)?;
|
|
}
|
|
|
|
let layout = self.components.factory.CreateTextLayout(
|
|
&text_wide,
|
|
&format,
|
|
f32::INFINITY,
|
|
f32::INFINITY,
|
|
)?;
|
|
let current_text = &text[utf8_offset..(utf8_offset + first_run.len)];
|
|
utf8_offset += first_run.len;
|
|
let current_text_utf16_length = current_text.encode_utf16().count() as u32;
|
|
let text_range = DWRITE_TEXT_RANGE {
|
|
startPosition: utf16_offset,
|
|
length: current_text_utf16_length,
|
|
};
|
|
layout.SetTypography(&font_info.features, text_range)?;
|
|
utf16_offset += current_text_utf16_length;
|
|
|
|
layout
|
|
};
|
|
|
|
let mut first_run = true;
|
|
let mut ascent = Pixels::default();
|
|
let mut descent = Pixels::default();
|
|
for run in font_runs {
|
|
if first_run {
|
|
first_run = false;
|
|
let mut metrics = vec![DWRITE_LINE_METRICS::default(); 4];
|
|
let mut line_count = 0u32;
|
|
text_layout.GetLineMetrics(Some(&mut metrics), &mut line_count as _)?;
|
|
ascent = px(metrics[0].baseline);
|
|
descent = px(metrics[0].height - metrics[0].baseline);
|
|
continue;
|
|
}
|
|
let font_info = &self.fonts[run.font_id.0];
|
|
let current_text = &text[utf8_offset..(utf8_offset + run.len)];
|
|
utf8_offset += run.len;
|
|
let current_text_utf16_length = current_text.encode_utf16().count() as u32;
|
|
|
|
let collection = if font_info.is_system_font {
|
|
&self.system_font_collection
|
|
} else {
|
|
&self.custom_font_collection
|
|
};
|
|
let text_range = DWRITE_TEXT_RANGE {
|
|
startPosition: utf16_offset,
|
|
length: current_text_utf16_length,
|
|
};
|
|
utf16_offset += current_text_utf16_length;
|
|
text_layout.SetFontCollection(collection, text_range)?;
|
|
text_layout
|
|
.SetFontFamilyName(&HSTRING::from(&font_info.font_family), text_range)?;
|
|
text_layout.SetFontSize(font_size.0, text_range)?;
|
|
text_layout.SetFontStyle(font_info.font_face.GetStyle(), text_range)?;
|
|
text_layout.SetFontWeight(font_info.font_face.GetWeight(), text_range)?;
|
|
text_layout.SetTypography(&font_info.features, text_range)?;
|
|
}
|
|
|
|
let mut runs = Vec::new();
|
|
let renderer_context = RendererContext {
|
|
text_system: self,
|
|
index_converter: StringIndexConverter::new(text),
|
|
runs: &mut runs,
|
|
width: 0.0,
|
|
};
|
|
text_layout.Draw(
|
|
Some(&renderer_context as *const _ as _),
|
|
&text_renderer.0,
|
|
0.0,
|
|
0.0,
|
|
)?;
|
|
let width = px(renderer_context.width);
|
|
|
|
Ok(LineLayout {
|
|
font_size,
|
|
width,
|
|
ascent,
|
|
descent,
|
|
runs,
|
|
len: text.len(),
|
|
})
|
|
}
|
|
}
|
|
|
|
fn font_metrics(&self, font_id: FontId) -> FontMetrics {
|
|
unsafe {
|
|
let font_info = &self.fonts[font_id.0];
|
|
let mut metrics = std::mem::zeroed();
|
|
font_info.font_face.GetMetrics(&mut metrics);
|
|
|
|
FontMetrics {
|
|
units_per_em: metrics.Base.designUnitsPerEm as _,
|
|
ascent: metrics.Base.ascent as _,
|
|
descent: -(metrics.Base.descent as f32),
|
|
line_gap: metrics.Base.lineGap as _,
|
|
underline_position: metrics.Base.underlinePosition as _,
|
|
underline_thickness: metrics.Base.underlineThickness as _,
|
|
cap_height: metrics.Base.capHeight as _,
|
|
x_height: metrics.Base.xHeight as _,
|
|
bounding_box: Bounds {
|
|
origin: Point {
|
|
x: metrics.glyphBoxLeft as _,
|
|
y: metrics.glyphBoxBottom as _,
|
|
},
|
|
size: Size {
|
|
width: (metrics.glyphBoxRight - metrics.glyphBoxLeft) as _,
|
|
height: (metrics.glyphBoxTop - metrics.glyphBoxBottom) as _,
|
|
},
|
|
},
|
|
}
|
|
}
|
|
}
|
|
|
|
fn create_glyph_run_analysis(
|
|
&self,
|
|
params: &RenderGlyphParams,
|
|
) -> Result<IDWriteGlyphRunAnalysis> {
|
|
let font = &self.fonts[params.font_id.0];
|
|
let glyph_id = [params.glyph_id.0 as u16];
|
|
let advance = [0.0];
|
|
let offset = [DWRITE_GLYPH_OFFSET::default()];
|
|
let glyph_run = DWRITE_GLYPH_RUN {
|
|
fontFace: unsafe { std::mem::transmute_copy(&font.font_face) },
|
|
fontEmSize: params.font_size.0,
|
|
glyphCount: 1,
|
|
glyphIndices: glyph_id.as_ptr(),
|
|
glyphAdvances: advance.as_ptr(),
|
|
glyphOffsets: offset.as_ptr(),
|
|
isSideways: BOOL(0),
|
|
bidiLevel: 0,
|
|
};
|
|
let transform = DWRITE_MATRIX {
|
|
m11: params.scale_factor,
|
|
m12: 0.0,
|
|
m21: 0.0,
|
|
m22: params.scale_factor,
|
|
dx: 0.0,
|
|
dy: 0.0,
|
|
};
|
|
let subpixel_shift = params
|
|
.subpixel_variant
|
|
.map(|v| v as f32 / SUBPIXEL_VARIANTS as f32);
|
|
let baseline_origin_x = subpixel_shift.x / params.scale_factor;
|
|
let baseline_origin_y = subpixel_shift.y / params.scale_factor;
|
|
|
|
let mut rendering_mode = DWRITE_RENDERING_MODE1::default();
|
|
let mut grid_fit_mode = DWRITE_GRID_FIT_MODE::default();
|
|
unsafe {
|
|
font.font_face.GetRecommendedRenderingMode(
|
|
params.font_size.0,
|
|
// The dpi here seems that it has the same effect with `Some(&transform)`
|
|
1.0,
|
|
1.0,
|
|
Some(&transform),
|
|
false,
|
|
DWRITE_OUTLINE_THRESHOLD_ANTIALIASED,
|
|
DWRITE_MEASURING_MODE_NATURAL,
|
|
&self.components.render_params,
|
|
&mut rendering_mode,
|
|
&mut grid_fit_mode,
|
|
)?;
|
|
}
|
|
|
|
let glyph_analysis = unsafe {
|
|
self.components.factory.CreateGlyphRunAnalysis(
|
|
&glyph_run,
|
|
Some(&transform),
|
|
rendering_mode,
|
|
DWRITE_MEASURING_MODE_NATURAL,
|
|
grid_fit_mode,
|
|
// We're using cleartype not grayscale for monochrome is because it provides better quality
|
|
DWRITE_TEXT_ANTIALIAS_MODE_CLEARTYPE,
|
|
baseline_origin_x,
|
|
baseline_origin_y,
|
|
)
|
|
}?;
|
|
Ok(glyph_analysis)
|
|
}
|
|
|
|
fn raster_bounds(&self, params: &RenderGlyphParams) -> Result<Bounds<DevicePixels>> {
|
|
let glyph_analysis = self.create_glyph_run_analysis(params)?;
|
|
|
|
let bounds = unsafe { glyph_analysis.GetAlphaTextureBounds(DWRITE_TEXTURE_CLEARTYPE_3x1)? };
|
|
// Some glyphs cannot be drawn with ClearType, such as bitmap fonts. In that case
|
|
// GetAlphaTextureBounds() supposedly returns an empty RECT, but I haven't tested that yet.
|
|
if !unsafe { IsRectEmpty(&bounds) }.as_bool() {
|
|
Ok(Bounds {
|
|
origin: point(bounds.left.into(), bounds.top.into()),
|
|
size: size(
|
|
(bounds.right - bounds.left).into(),
|
|
(bounds.bottom - bounds.top).into(),
|
|
),
|
|
})
|
|
} else {
|
|
// If it's empty, retry with grayscale AA.
|
|
let bounds =
|
|
unsafe { glyph_analysis.GetAlphaTextureBounds(DWRITE_TEXTURE_ALIASED_1x1)? };
|
|
|
|
if bounds.right < bounds.left {
|
|
Ok(Bounds {
|
|
origin: point(0.into(), 0.into()),
|
|
size: size(0.into(), 0.into()),
|
|
})
|
|
} else {
|
|
Ok(Bounds {
|
|
origin: point(bounds.left.into(), bounds.top.into()),
|
|
size: size(
|
|
(bounds.right - bounds.left).into(),
|
|
(bounds.bottom - bounds.top).into(),
|
|
),
|
|
})
|
|
}
|
|
}
|
|
}
|
|
|
|
fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option<GlyphId> {
|
|
let font_info = &self.fonts[font_id.0];
|
|
let codepoints = [ch as u32];
|
|
let mut glyph_indices = vec![0u16; 1];
|
|
unsafe {
|
|
font_info
|
|
.font_face
|
|
.GetGlyphIndices(codepoints.as_ptr(), 1, glyph_indices.as_mut_ptr())
|
|
.log_err()
|
|
}
|
|
.map(|_| GlyphId(glyph_indices[0] as u32))
|
|
}
|
|
|
|
fn rasterize_glyph(
|
|
&self,
|
|
params: &RenderGlyphParams,
|
|
glyph_bounds: Bounds<DevicePixels>,
|
|
) -> Result<(Size<DevicePixels>, Vec<u8>)> {
|
|
if glyph_bounds.size.width.0 == 0 || glyph_bounds.size.height.0 == 0 {
|
|
anyhow::bail!("glyph bounds are empty");
|
|
}
|
|
|
|
let bitmap_data = if params.is_emoji {
|
|
if let Ok(color) = self.rasterize_color(¶ms, glyph_bounds) {
|
|
color
|
|
} else {
|
|
let monochrome = self.rasterize_monochrome(params, glyph_bounds)?;
|
|
monochrome
|
|
.into_iter()
|
|
.flat_map(|pixel| [0, 0, 0, pixel])
|
|
.collect::<Vec<_>>()
|
|
}
|
|
} else {
|
|
self.rasterize_monochrome(params, glyph_bounds)?
|
|
};
|
|
|
|
Ok((glyph_bounds.size, bitmap_data))
|
|
}
|
|
|
|
fn rasterize_monochrome(
|
|
&self,
|
|
params: &RenderGlyphParams,
|
|
glyph_bounds: Bounds<DevicePixels>,
|
|
) -> Result<Vec<u8>> {
|
|
let mut bitmap_data =
|
|
vec![0u8; glyph_bounds.size.width.0 as usize * glyph_bounds.size.height.0 as usize * 3];
|
|
|
|
let glyph_analysis = self.create_glyph_run_analysis(params)?;
|
|
unsafe {
|
|
glyph_analysis.CreateAlphaTexture(
|
|
// We're using cleartype not grayscale for monochrome is because it provides better quality
|
|
DWRITE_TEXTURE_CLEARTYPE_3x1,
|
|
&RECT {
|
|
left: glyph_bounds.origin.x.0,
|
|
top: glyph_bounds.origin.y.0,
|
|
right: glyph_bounds.size.width.0 + glyph_bounds.origin.x.0,
|
|
bottom: glyph_bounds.size.height.0 + glyph_bounds.origin.y.0,
|
|
},
|
|
&mut bitmap_data,
|
|
)?;
|
|
}
|
|
|
|
let bitmap_factory = self.components.bitmap_factory.resolve()?;
|
|
let bitmap = unsafe {
|
|
bitmap_factory.CreateBitmapFromMemory(
|
|
glyph_bounds.size.width.0 as u32,
|
|
glyph_bounds.size.height.0 as u32,
|
|
&GUID_WICPixelFormat24bppRGB,
|
|
glyph_bounds.size.width.0 as u32 * 3,
|
|
&bitmap_data,
|
|
)
|
|
}?;
|
|
|
|
let grayscale_bitmap =
|
|
unsafe { WICConvertBitmapSource(&GUID_WICPixelFormat8bppGray, &bitmap) }?;
|
|
|
|
let mut bitmap_data =
|
|
vec![0u8; glyph_bounds.size.width.0 as usize * glyph_bounds.size.height.0 as usize];
|
|
unsafe {
|
|
grayscale_bitmap.CopyPixels(
|
|
std::ptr::null() as _,
|
|
glyph_bounds.size.width.0 as u32,
|
|
&mut bitmap_data,
|
|
)
|
|
}?;
|
|
|
|
Ok(bitmap_data)
|
|
}
|
|
|
|
fn rasterize_color(
|
|
&self,
|
|
params: &RenderGlyphParams,
|
|
glyph_bounds: Bounds<DevicePixels>,
|
|
) -> Result<Vec<u8>> {
|
|
let bitmap_size = glyph_bounds.size;
|
|
let subpixel_shift = params
|
|
.subpixel_variant
|
|
.map(|v| v as f32 / SUBPIXEL_VARIANTS as f32);
|
|
let baseline_origin_x = subpixel_shift.x / params.scale_factor;
|
|
let baseline_origin_y = subpixel_shift.y / params.scale_factor;
|
|
|
|
let transform = DWRITE_MATRIX {
|
|
m11: params.scale_factor,
|
|
m12: 0.0,
|
|
m21: 0.0,
|
|
m22: params.scale_factor,
|
|
dx: 0.0,
|
|
dy: 0.0,
|
|
};
|
|
|
|
let font = &self.fonts[params.font_id.0];
|
|
let glyph_id = [params.glyph_id.0 as u16];
|
|
let advance = [glyph_bounds.size.width.0 as f32];
|
|
let offset = [DWRITE_GLYPH_OFFSET {
|
|
advanceOffset: -glyph_bounds.origin.x.0 as f32 / params.scale_factor,
|
|
ascenderOffset: glyph_bounds.origin.y.0 as f32 / params.scale_factor,
|
|
}];
|
|
let glyph_run = DWRITE_GLYPH_RUN {
|
|
fontFace: unsafe { std::mem::transmute_copy(&font.font_face) },
|
|
fontEmSize: params.font_size.0,
|
|
glyphCount: 1,
|
|
glyphIndices: glyph_id.as_ptr(),
|
|
glyphAdvances: advance.as_ptr(),
|
|
glyphOffsets: offset.as_ptr(),
|
|
isSideways: BOOL(0),
|
|
bidiLevel: 0,
|
|
};
|
|
|
|
// todo: support formats other than COLR
|
|
let color_enumerator = unsafe {
|
|
self.components.factory.TranslateColorGlyphRun(
|
|
Vector2::new(baseline_origin_x, baseline_origin_y),
|
|
&glyph_run,
|
|
None,
|
|
DWRITE_GLYPH_IMAGE_FORMATS_COLR,
|
|
DWRITE_MEASURING_MODE_NATURAL,
|
|
Some(&transform),
|
|
0,
|
|
)
|
|
}?;
|
|
|
|
let mut glyph_layers = Vec::new();
|
|
loop {
|
|
let color_run = unsafe { color_enumerator.GetCurrentRun() }?;
|
|
let color_run = unsafe { &*color_run };
|
|
let image_format = color_run.glyphImageFormat & !DWRITE_GLYPH_IMAGE_FORMATS_TRUETYPE;
|
|
if image_format == DWRITE_GLYPH_IMAGE_FORMATS_COLR {
|
|
let color_analysis = unsafe {
|
|
self.components.factory.CreateGlyphRunAnalysis(
|
|
&color_run.Base.glyphRun as *const _,
|
|
Some(&transform),
|
|
DWRITE_RENDERING_MODE1_NATURAL_SYMMETRIC,
|
|
DWRITE_MEASURING_MODE_NATURAL,
|
|
DWRITE_GRID_FIT_MODE_DEFAULT,
|
|
DWRITE_TEXT_ANTIALIAS_MODE_CLEARTYPE,
|
|
baseline_origin_x,
|
|
baseline_origin_y,
|
|
)
|
|
}?;
|
|
|
|
let color_bounds =
|
|
unsafe { color_analysis.GetAlphaTextureBounds(DWRITE_TEXTURE_CLEARTYPE_3x1) }?;
|
|
|
|
let color_size = size(
|
|
color_bounds.right - color_bounds.left,
|
|
color_bounds.bottom - color_bounds.top,
|
|
);
|
|
if color_size.width > 0 && color_size.height > 0 {
|
|
let mut alpha_data =
|
|
vec![0u8; (color_size.width * color_size.height * 3) as usize];
|
|
unsafe {
|
|
color_analysis.CreateAlphaTexture(
|
|
DWRITE_TEXTURE_CLEARTYPE_3x1,
|
|
&color_bounds,
|
|
&mut alpha_data,
|
|
)
|
|
}?;
|
|
|
|
let run_color = {
|
|
let run_color = color_run.Base.runColor;
|
|
Rgba {
|
|
r: run_color.r,
|
|
g: run_color.g,
|
|
b: run_color.b,
|
|
a: run_color.a,
|
|
}
|
|
};
|
|
let bounds = bounds(point(color_bounds.left, color_bounds.top), color_size);
|
|
let alpha_data = alpha_data
|
|
.chunks_exact(3)
|
|
.flat_map(|chunk| [chunk[0], chunk[1], chunk[2], 255])
|
|
.collect::<Vec<_>>();
|
|
glyph_layers.push(GlyphLayerTexture::new(
|
|
&self.components.gpu_state,
|
|
run_color,
|
|
bounds,
|
|
&alpha_data,
|
|
)?);
|
|
}
|
|
}
|
|
|
|
let has_next = unsafe { color_enumerator.MoveNext() }
|
|
.map(|e| e.as_bool())
|
|
.unwrap_or(false);
|
|
if !has_next {
|
|
break;
|
|
}
|
|
}
|
|
|
|
let gpu_state = &self.components.gpu_state;
|
|
let params_buffer = {
|
|
let desc = D3D11_BUFFER_DESC {
|
|
ByteWidth: std::mem::size_of::<GlyphLayerTextureParams>() as u32,
|
|
Usage: D3D11_USAGE_DYNAMIC,
|
|
BindFlags: D3D11_BIND_CONSTANT_BUFFER.0 as u32,
|
|
CPUAccessFlags: D3D11_CPU_ACCESS_WRITE.0 as u32,
|
|
MiscFlags: 0,
|
|
StructureByteStride: 0,
|
|
};
|
|
|
|
let mut buffer = None;
|
|
unsafe {
|
|
gpu_state
|
|
.device
|
|
.CreateBuffer(&desc, None, Some(&mut buffer))
|
|
}?;
|
|
[buffer]
|
|
};
|
|
|
|
let render_target_texture = {
|
|
let mut texture = None;
|
|
let desc = D3D11_TEXTURE2D_DESC {
|
|
Width: bitmap_size.width.0 as u32,
|
|
Height: bitmap_size.height.0 as u32,
|
|
MipLevels: 1,
|
|
ArraySize: 1,
|
|
Format: DXGI_FORMAT_B8G8R8A8_UNORM,
|
|
SampleDesc: DXGI_SAMPLE_DESC {
|
|
Count: 1,
|
|
Quality: 0,
|
|
},
|
|
Usage: D3D11_USAGE_DEFAULT,
|
|
BindFlags: D3D11_BIND_RENDER_TARGET.0 as u32,
|
|
CPUAccessFlags: 0,
|
|
MiscFlags: 0,
|
|
};
|
|
unsafe {
|
|
gpu_state
|
|
.device
|
|
.CreateTexture2D(&desc, None, Some(&mut texture))
|
|
}?;
|
|
texture.unwrap()
|
|
};
|
|
|
|
let render_target_view = {
|
|
let desc = D3D11_RENDER_TARGET_VIEW_DESC {
|
|
Format: DXGI_FORMAT_B8G8R8A8_UNORM,
|
|
ViewDimension: D3D11_RTV_DIMENSION_TEXTURE2D,
|
|
Anonymous: D3D11_RENDER_TARGET_VIEW_DESC_0 {
|
|
Texture2D: D3D11_TEX2D_RTV { MipSlice: 0 },
|
|
},
|
|
};
|
|
let mut rtv = None;
|
|
unsafe {
|
|
gpu_state.device.CreateRenderTargetView(
|
|
&render_target_texture,
|
|
Some(&desc),
|
|
Some(&mut rtv),
|
|
)
|
|
}?;
|
|
[rtv]
|
|
};
|
|
|
|
let staging_texture = {
|
|
let mut texture = None;
|
|
let desc = D3D11_TEXTURE2D_DESC {
|
|
Width: bitmap_size.width.0 as u32,
|
|
Height: bitmap_size.height.0 as u32,
|
|
MipLevels: 1,
|
|
ArraySize: 1,
|
|
Format: DXGI_FORMAT_B8G8R8A8_UNORM,
|
|
SampleDesc: DXGI_SAMPLE_DESC {
|
|
Count: 1,
|
|
Quality: 0,
|
|
},
|
|
Usage: D3D11_USAGE_STAGING,
|
|
BindFlags: 0,
|
|
CPUAccessFlags: D3D11_CPU_ACCESS_READ.0 as u32,
|
|
MiscFlags: 0,
|
|
};
|
|
unsafe {
|
|
gpu_state
|
|
.device
|
|
.CreateTexture2D(&desc, None, Some(&mut texture))
|
|
}?;
|
|
texture.unwrap()
|
|
};
|
|
|
|
let device_context = &gpu_state.device_context;
|
|
unsafe { device_context.IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP) };
|
|
unsafe { device_context.VSSetShader(&gpu_state.vertex_shader, None) };
|
|
unsafe { device_context.PSSetShader(&gpu_state.pixel_shader, None) };
|
|
unsafe { device_context.VSSetConstantBuffers(0, Some(¶ms_buffer)) };
|
|
unsafe { device_context.PSSetConstantBuffers(0, Some(¶ms_buffer)) };
|
|
unsafe { device_context.OMSetRenderTargets(Some(&render_target_view), None) };
|
|
unsafe { device_context.PSSetSamplers(0, Some(&gpu_state.sampler)) };
|
|
unsafe { device_context.OMSetBlendState(&gpu_state.blend_state, None, 0xffffffff) };
|
|
|
|
for layer in glyph_layers {
|
|
let params = GlyphLayerTextureParams {
|
|
run_color: layer.run_color,
|
|
bounds: layer.bounds,
|
|
};
|
|
unsafe {
|
|
let mut dest = std::mem::zeroed();
|
|
gpu_state.device_context.Map(
|
|
params_buffer[0].as_ref().unwrap(),
|
|
0,
|
|
D3D11_MAP_WRITE_DISCARD,
|
|
0,
|
|
Some(&mut dest),
|
|
)?;
|
|
std::ptr::copy_nonoverlapping(¶ms as *const _, dest.pData as *mut _, 1);
|
|
gpu_state
|
|
.device_context
|
|
.Unmap(params_buffer[0].as_ref().unwrap(), 0);
|
|
};
|
|
|
|
let texture = [Some(layer.texture_view)];
|
|
unsafe { device_context.PSSetShaderResources(0, Some(&texture)) };
|
|
|
|
let viewport = [D3D11_VIEWPORT {
|
|
TopLeftX: layer.bounds.origin.x as f32,
|
|
TopLeftY: layer.bounds.origin.y as f32,
|
|
Width: layer.bounds.size.width as f32,
|
|
Height: layer.bounds.size.height as f32,
|
|
MinDepth: 0.0,
|
|
MaxDepth: 1.0,
|
|
}];
|
|
unsafe { device_context.RSSetViewports(Some(&viewport)) };
|
|
|
|
unsafe { device_context.Draw(4, 0) };
|
|
}
|
|
|
|
unsafe { device_context.CopyResource(&staging_texture, &render_target_texture) };
|
|
|
|
let mapped_data = {
|
|
let mut mapped_data = D3D11_MAPPED_SUBRESOURCE::default();
|
|
unsafe {
|
|
device_context.Map(
|
|
&staging_texture,
|
|
0,
|
|
D3D11_MAP_READ,
|
|
0,
|
|
Some(&mut mapped_data),
|
|
)
|
|
}?;
|
|
mapped_data
|
|
};
|
|
let mut rasterized =
|
|
vec![0u8; (bitmap_size.width.0 as u32 * bitmap_size.height.0 as u32 * 4) as usize];
|
|
|
|
for y in 0..bitmap_size.height.0 as usize {
|
|
let width = bitmap_size.width.0 as usize;
|
|
unsafe {
|
|
std::ptr::copy_nonoverlapping::<u8>(
|
|
(mapped_data.pData as *const u8).byte_add(mapped_data.RowPitch as usize * y),
|
|
rasterized
|
|
.as_mut_ptr()
|
|
.byte_add(width * y * std::mem::size_of::<u32>()),
|
|
width * std::mem::size_of::<u32>(),
|
|
)
|
|
};
|
|
}
|
|
|
|
Ok(rasterized)
|
|
}
|
|
|
|
fn get_typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Bounds<f32>> {
|
|
unsafe {
|
|
let font = &self.fonts[font_id.0].font_face;
|
|
let glyph_indices = [glyph_id.0 as u16];
|
|
let mut metrics = [DWRITE_GLYPH_METRICS::default()];
|
|
font.GetDesignGlyphMetrics(glyph_indices.as_ptr(), 1, metrics.as_mut_ptr(), false)?;
|
|
|
|
let metrics = &metrics[0];
|
|
let advance_width = metrics.advanceWidth as i32;
|
|
let advance_height = metrics.advanceHeight as i32;
|
|
let left_side_bearing = metrics.leftSideBearing;
|
|
let right_side_bearing = metrics.rightSideBearing;
|
|
let top_side_bearing = metrics.topSideBearing;
|
|
let bottom_side_bearing = metrics.bottomSideBearing;
|
|
let vertical_origin_y = metrics.verticalOriginY;
|
|
|
|
let y_offset = vertical_origin_y + bottom_side_bearing - advance_height;
|
|
let width = advance_width - (left_side_bearing + right_side_bearing);
|
|
let height = advance_height - (top_side_bearing + bottom_side_bearing);
|
|
|
|
Ok(Bounds {
|
|
origin: Point {
|
|
x: left_side_bearing as f32,
|
|
y: y_offset as f32,
|
|
},
|
|
size: Size {
|
|
width: width as f32,
|
|
height: height as f32,
|
|
},
|
|
})
|
|
}
|
|
}
|
|
|
|
fn get_advance(&self, font_id: FontId, glyph_id: GlyphId) -> Result<Size<f32>> {
|
|
unsafe {
|
|
let font = &self.fonts[font_id.0].font_face;
|
|
let glyph_indices = [glyph_id.0 as u16];
|
|
let mut metrics = [DWRITE_GLYPH_METRICS::default()];
|
|
font.GetDesignGlyphMetrics(glyph_indices.as_ptr(), 1, metrics.as_mut_ptr(), false)?;
|
|
|
|
let metrics = &metrics[0];
|
|
|
|
Ok(Size {
|
|
width: metrics.advanceWidth as f32,
|
|
height: 0.0,
|
|
})
|
|
}
|
|
}
|
|
|
|
fn all_font_names(&self) -> Vec<String> {
|
|
let mut result =
|
|
get_font_names_from_collection(&self.system_font_collection, &self.components.locale);
|
|
result.extend(get_font_names_from_collection(
|
|
&self.custom_font_collection,
|
|
&self.components.locale,
|
|
));
|
|
result
|
|
}
|
|
}
|
|
|
|
impl Drop for DirectWriteState {
|
|
fn drop(&mut self) {
|
|
unsafe {
|
|
let _ = self
|
|
.components
|
|
.factory
|
|
.UnregisterFontFileLoader(&self.components.in_memory_loader);
|
|
}
|
|
}
|
|
}
|
|
|
|
struct GlyphLayerTexture {
|
|
run_color: Rgba,
|
|
bounds: Bounds<i32>,
|
|
texture_view: ID3D11ShaderResourceView,
|
|
// holding on to the texture to not RAII drop it
|
|
_texture: ID3D11Texture2D,
|
|
}
|
|
|
|
impl GlyphLayerTexture {
|
|
pub fn new(
|
|
gpu_state: &GPUState,
|
|
run_color: Rgba,
|
|
bounds: Bounds<i32>,
|
|
alpha_data: &[u8],
|
|
) -> Result<Self> {
|
|
let texture_size = bounds.size;
|
|
|
|
let desc = D3D11_TEXTURE2D_DESC {
|
|
Width: texture_size.width as u32,
|
|
Height: texture_size.height as u32,
|
|
MipLevels: 1,
|
|
ArraySize: 1,
|
|
Format: DXGI_FORMAT_R8G8B8A8_UNORM,
|
|
SampleDesc: DXGI_SAMPLE_DESC {
|
|
Count: 1,
|
|
Quality: 0,
|
|
},
|
|
Usage: D3D11_USAGE_DEFAULT,
|
|
BindFlags: D3D11_BIND_SHADER_RESOURCE.0 as u32,
|
|
CPUAccessFlags: D3D11_CPU_ACCESS_WRITE.0 as u32,
|
|
MiscFlags: 0,
|
|
};
|
|
|
|
let texture = {
|
|
let mut texture: Option<ID3D11Texture2D> = None;
|
|
unsafe {
|
|
gpu_state
|
|
.device
|
|
.CreateTexture2D(&desc, None, Some(&mut texture))?
|
|
};
|
|
texture.unwrap()
|
|
};
|
|
let texture_view = {
|
|
let mut view: Option<ID3D11ShaderResourceView> = None;
|
|
unsafe {
|
|
gpu_state
|
|
.device
|
|
.CreateShaderResourceView(&texture, None, Some(&mut view))?
|
|
};
|
|
view.unwrap()
|
|
};
|
|
|
|
unsafe {
|
|
gpu_state.device_context.UpdateSubresource(
|
|
&texture,
|
|
0,
|
|
None,
|
|
alpha_data.as_ptr() as _,
|
|
(texture_size.width * 4) as u32,
|
|
0,
|
|
)
|
|
};
|
|
|
|
Ok(GlyphLayerTexture {
|
|
run_color,
|
|
bounds,
|
|
texture_view,
|
|
_texture: texture,
|
|
})
|
|
}
|
|
}
|
|
|
|
#[repr(C)]
|
|
struct GlyphLayerTextureParams {
|
|
bounds: Bounds<i32>,
|
|
run_color: Rgba,
|
|
}
|
|
|
|
struct TextRendererWrapper(pub IDWriteTextRenderer);
|
|
|
|
impl TextRendererWrapper {
|
|
pub fn new(locale_str: &str) -> Self {
|
|
let inner = TextRenderer::new(locale_str);
|
|
TextRendererWrapper(inner.into())
|
|
}
|
|
}
|
|
|
|
#[implement(IDWriteTextRenderer)]
|
|
struct TextRenderer {
|
|
locale: String,
|
|
}
|
|
|
|
impl TextRenderer {
|
|
pub fn new(locale_str: &str) -> Self {
|
|
TextRenderer {
|
|
locale: locale_str.to_owned(),
|
|
}
|
|
}
|
|
}
|
|
|
|
struct RendererContext<'t, 'a, 'b> {
|
|
text_system: &'t mut DirectWriteState,
|
|
index_converter: StringIndexConverter<'a>,
|
|
runs: &'b mut Vec<ShapedRun>,
|
|
width: f32,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct ClusterAnalyzer<'t> {
|
|
utf16_idx: usize,
|
|
glyph_idx: usize,
|
|
glyph_count: usize,
|
|
cluster_map: &'t [u16],
|
|
}
|
|
|
|
impl<'t> ClusterAnalyzer<'t> {
|
|
pub fn new(cluster_map: &'t [u16], glyph_count: usize) -> Self {
|
|
ClusterAnalyzer {
|
|
utf16_idx: 0,
|
|
glyph_idx: 0,
|
|
glyph_count,
|
|
cluster_map,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Iterator for ClusterAnalyzer<'_> {
|
|
type Item = (usize, usize);
|
|
|
|
fn next(&mut self) -> Option<(usize, usize)> {
|
|
if self.utf16_idx >= self.cluster_map.len() {
|
|
return None; // No more clusters
|
|
}
|
|
let start_utf16_idx = self.utf16_idx;
|
|
let current_glyph = self.cluster_map[start_utf16_idx] as usize;
|
|
|
|
// Find the end of current cluster (where glyph index changes)
|
|
let mut end_utf16_idx = start_utf16_idx + 1;
|
|
while end_utf16_idx < self.cluster_map.len()
|
|
&& self.cluster_map[end_utf16_idx] as usize == current_glyph
|
|
{
|
|
end_utf16_idx += 1;
|
|
}
|
|
|
|
let utf16_len = end_utf16_idx - start_utf16_idx;
|
|
|
|
// Calculate glyph count for this cluster
|
|
let next_glyph = if end_utf16_idx < self.cluster_map.len() {
|
|
self.cluster_map[end_utf16_idx] as usize
|
|
} else {
|
|
self.glyph_count
|
|
};
|
|
|
|
let glyph_count = next_glyph - current_glyph;
|
|
|
|
// Update state for next call
|
|
self.utf16_idx = end_utf16_idx;
|
|
self.glyph_idx = next_glyph;
|
|
|
|
Some((utf16_len, glyph_count))
|
|
}
|
|
}
|
|
|
|
#[allow(non_snake_case)]
|
|
impl IDWritePixelSnapping_Impl for TextRenderer_Impl {
|
|
fn IsPixelSnappingDisabled(
|
|
&self,
|
|
_clientdrawingcontext: *const ::core::ffi::c_void,
|
|
) -> windows::core::Result<BOOL> {
|
|
Ok(BOOL(0))
|
|
}
|
|
|
|
fn GetCurrentTransform(
|
|
&self,
|
|
_clientdrawingcontext: *const ::core::ffi::c_void,
|
|
transform: *mut DWRITE_MATRIX,
|
|
) -> windows::core::Result<()> {
|
|
unsafe {
|
|
*transform = DWRITE_MATRIX {
|
|
m11: 1.0,
|
|
m12: 0.0,
|
|
m21: 0.0,
|
|
m22: 1.0,
|
|
dx: 0.0,
|
|
dy: 0.0,
|
|
};
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
fn GetPixelsPerDip(
|
|
&self,
|
|
_clientdrawingcontext: *const ::core::ffi::c_void,
|
|
) -> windows::core::Result<f32> {
|
|
Ok(1.0)
|
|
}
|
|
}
|
|
|
|
#[allow(non_snake_case)]
|
|
impl IDWriteTextRenderer_Impl for TextRenderer_Impl {
|
|
fn DrawGlyphRun(
|
|
&self,
|
|
clientdrawingcontext: *const ::core::ffi::c_void,
|
|
_baselineoriginx: f32,
|
|
_baselineoriginy: f32,
|
|
_measuringmode: DWRITE_MEASURING_MODE,
|
|
glyphrun: *const DWRITE_GLYPH_RUN,
|
|
glyphrundescription: *const DWRITE_GLYPH_RUN_DESCRIPTION,
|
|
_clientdrawingeffect: windows::core::Ref<windows::core::IUnknown>,
|
|
) -> windows::core::Result<()> {
|
|
let glyphrun = unsafe { &*glyphrun };
|
|
let glyph_count = glyphrun.glyphCount as usize;
|
|
if glyph_count == 0 || glyphrun.fontFace.is_none() {
|
|
return Ok(());
|
|
}
|
|
let desc = unsafe { &*glyphrundescription };
|
|
let context = unsafe {
|
|
&mut *(clientdrawingcontext as *const RendererContext as *mut RendererContext)
|
|
};
|
|
let font_face = glyphrun.fontFace.as_ref().unwrap();
|
|
// This `cast()` action here should never fail since we are running on Win10+, and
|
|
// `IDWriteFontFace3` requires Win10
|
|
let font_face = &font_face.cast::<IDWriteFontFace3>().unwrap();
|
|
let Some((font_identifier, font_struct, color_font)) =
|
|
get_font_identifier_and_font_struct(font_face, &self.locale)
|
|
else {
|
|
return Ok(());
|
|
};
|
|
|
|
let font_id = if let Some(id) = context
|
|
.text_system
|
|
.font_id_by_identifier
|
|
.get(&font_identifier)
|
|
{
|
|
*id
|
|
} else {
|
|
context.text_system.select_font(&font_struct)
|
|
};
|
|
|
|
let glyph_ids = unsafe { std::slice::from_raw_parts(glyphrun.glyphIndices, glyph_count) };
|
|
let glyph_advances =
|
|
unsafe { std::slice::from_raw_parts(glyphrun.glyphAdvances, glyph_count) };
|
|
let glyph_offsets =
|
|
unsafe { std::slice::from_raw_parts(glyphrun.glyphOffsets, glyph_count) };
|
|
let cluster_map =
|
|
unsafe { std::slice::from_raw_parts(desc.clusterMap, desc.stringLength as usize) };
|
|
|
|
let mut cluster_analyzer = ClusterAnalyzer::new(cluster_map, glyph_count);
|
|
let mut utf16_idx = desc.textPosition as usize;
|
|
let mut glyph_idx = 0;
|
|
let mut glyphs = Vec::with_capacity(glyph_count);
|
|
for (cluster_utf16_len, cluster_glyph_count) in cluster_analyzer {
|
|
context.index_converter.advance_to_utf16_ix(utf16_idx);
|
|
utf16_idx += cluster_utf16_len;
|
|
for (cluster_glyph_idx, glyph_id) in glyph_ids
|
|
[glyph_idx..(glyph_idx + cluster_glyph_count)]
|
|
.iter()
|
|
.enumerate()
|
|
{
|
|
let id = GlyphId(*glyph_id as u32);
|
|
let is_emoji = color_font
|
|
&& is_color_glyph(font_face, id, &context.text_system.components.factory);
|
|
let this_glyph_idx = glyph_idx + cluster_glyph_idx;
|
|
glyphs.push(ShapedGlyph {
|
|
id,
|
|
position: point(
|
|
px(context.width + glyph_offsets[this_glyph_idx].advanceOffset),
|
|
px(0.0),
|
|
),
|
|
index: context.index_converter.utf8_ix,
|
|
is_emoji,
|
|
});
|
|
context.width += glyph_advances[this_glyph_idx];
|
|
}
|
|
glyph_idx += cluster_glyph_count;
|
|
}
|
|
context.runs.push(ShapedRun { font_id, glyphs });
|
|
Ok(())
|
|
}
|
|
|
|
fn DrawUnderline(
|
|
&self,
|
|
_clientdrawingcontext: *const ::core::ffi::c_void,
|
|
_baselineoriginx: f32,
|
|
_baselineoriginy: f32,
|
|
_underline: *const DWRITE_UNDERLINE,
|
|
_clientdrawingeffect: windows::core::Ref<windows::core::IUnknown>,
|
|
) -> windows::core::Result<()> {
|
|
Err(windows::core::Error::new(
|
|
E_NOTIMPL,
|
|
"DrawUnderline unimplemented",
|
|
))
|
|
}
|
|
|
|
fn DrawStrikethrough(
|
|
&self,
|
|
_clientdrawingcontext: *const ::core::ffi::c_void,
|
|
_baselineoriginx: f32,
|
|
_baselineoriginy: f32,
|
|
_strikethrough: *const DWRITE_STRIKETHROUGH,
|
|
_clientdrawingeffect: windows::core::Ref<windows::core::IUnknown>,
|
|
) -> windows::core::Result<()> {
|
|
Err(windows::core::Error::new(
|
|
E_NOTIMPL,
|
|
"DrawStrikethrough unimplemented",
|
|
))
|
|
}
|
|
|
|
fn DrawInlineObject(
|
|
&self,
|
|
_clientdrawingcontext: *const ::core::ffi::c_void,
|
|
_originx: f32,
|
|
_originy: f32,
|
|
_inlineobject: windows::core::Ref<IDWriteInlineObject>,
|
|
_issideways: BOOL,
|
|
_isrighttoleft: BOOL,
|
|
_clientdrawingeffect: windows::core::Ref<windows::core::IUnknown>,
|
|
) -> windows::core::Result<()> {
|
|
Err(windows::core::Error::new(
|
|
E_NOTIMPL,
|
|
"DrawInlineObject unimplemented",
|
|
))
|
|
}
|
|
}
|
|
|
|
struct StringIndexConverter<'a> {
|
|
text: &'a str,
|
|
utf8_ix: usize,
|
|
utf16_ix: usize,
|
|
}
|
|
|
|
impl<'a> StringIndexConverter<'a> {
|
|
fn new(text: &'a str) -> Self {
|
|
Self {
|
|
text,
|
|
utf8_ix: 0,
|
|
utf16_ix: 0,
|
|
}
|
|
}
|
|
|
|
#[allow(dead_code)]
|
|
fn advance_to_utf8_ix(&mut self, utf8_target: usize) {
|
|
for (ix, c) in self.text[self.utf8_ix..].char_indices() {
|
|
if self.utf8_ix + ix >= utf8_target {
|
|
self.utf8_ix += ix;
|
|
return;
|
|
}
|
|
self.utf16_ix += c.len_utf16();
|
|
}
|
|
self.utf8_ix = self.text.len();
|
|
}
|
|
|
|
fn advance_to_utf16_ix(&mut self, utf16_target: usize) {
|
|
for (ix, c) in self.text[self.utf8_ix..].char_indices() {
|
|
if self.utf16_ix >= utf16_target {
|
|
self.utf8_ix += ix;
|
|
return;
|
|
}
|
|
self.utf16_ix += c.len_utf16();
|
|
}
|
|
self.utf8_ix = self.text.len();
|
|
}
|
|
}
|
|
|
|
impl Into<DWRITE_FONT_STYLE> for FontStyle {
|
|
fn into(self) -> DWRITE_FONT_STYLE {
|
|
match self {
|
|
FontStyle::Normal => DWRITE_FONT_STYLE_NORMAL,
|
|
FontStyle::Italic => DWRITE_FONT_STYLE_ITALIC,
|
|
FontStyle::Oblique => DWRITE_FONT_STYLE_OBLIQUE,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<DWRITE_FONT_STYLE> for FontStyle {
|
|
fn from(value: DWRITE_FONT_STYLE) -> Self {
|
|
match value.0 {
|
|
0 => FontStyle::Normal,
|
|
1 => FontStyle::Italic,
|
|
2 => FontStyle::Oblique,
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Into<DWRITE_FONT_WEIGHT> for FontWeight {
|
|
fn into(self) -> DWRITE_FONT_WEIGHT {
|
|
DWRITE_FONT_WEIGHT(self.0 as i32)
|
|
}
|
|
}
|
|
|
|
impl From<DWRITE_FONT_WEIGHT> for FontWeight {
|
|
fn from(value: DWRITE_FONT_WEIGHT) -> Self {
|
|
FontWeight(value.0 as f32)
|
|
}
|
|
}
|
|
|
|
fn get_font_names_from_collection(
|
|
collection: &IDWriteFontCollection1,
|
|
locale: &str,
|
|
) -> Vec<String> {
|
|
unsafe {
|
|
let mut result = Vec::new();
|
|
let family_count = collection.GetFontFamilyCount();
|
|
for index in 0..family_count {
|
|
let Some(font_family) = collection.GetFontFamily(index).log_err() else {
|
|
continue;
|
|
};
|
|
let Some(localized_family_name) = font_family.GetFamilyNames().log_err() else {
|
|
continue;
|
|
};
|
|
let Some(family_name) = get_name(localized_family_name, locale).log_err() else {
|
|
continue;
|
|
};
|
|
result.push(family_name);
|
|
}
|
|
|
|
result
|
|
}
|
|
}
|
|
|
|
fn get_font_identifier_and_font_struct(
|
|
font_face: &IDWriteFontFace3,
|
|
locale: &str,
|
|
) -> Option<(FontIdentifier, Font, bool)> {
|
|
let postscript_name = get_postscript_name(font_face, locale).log_err()?;
|
|
let localized_family_name = unsafe { font_face.GetFamilyNames().log_err() }?;
|
|
let family_name = get_name(localized_family_name, locale).log_err()?;
|
|
let weight = unsafe { font_face.GetWeight() };
|
|
let style = unsafe { font_face.GetStyle() };
|
|
let identifier = FontIdentifier {
|
|
postscript_name,
|
|
weight: weight.0,
|
|
style: style.0,
|
|
};
|
|
let font_struct = Font {
|
|
family: family_name.into(),
|
|
features: FontFeatures::default(),
|
|
weight: weight.into(),
|
|
style: style.into(),
|
|
fallbacks: None,
|
|
};
|
|
let is_emoji = unsafe { font_face.IsColorFont().as_bool() };
|
|
Some((identifier, font_struct, is_emoji))
|
|
}
|
|
|
|
#[inline]
|
|
fn get_font_identifier(font_face: &IDWriteFontFace3, locale: &str) -> Option<FontIdentifier> {
|
|
let weight = unsafe { font_face.GetWeight().0 };
|
|
let style = unsafe { font_face.GetStyle().0 };
|
|
get_postscript_name(font_face, locale)
|
|
.log_err()
|
|
.map(|postscript_name| FontIdentifier {
|
|
postscript_name,
|
|
weight,
|
|
style,
|
|
})
|
|
}
|
|
|
|
#[inline]
|
|
fn get_postscript_name(font_face: &IDWriteFontFace3, locale: &str) -> Result<String> {
|
|
let mut info = None;
|
|
let mut exists = BOOL(0);
|
|
unsafe {
|
|
font_face.GetInformationalStrings(
|
|
DWRITE_INFORMATIONAL_STRING_POSTSCRIPT_NAME,
|
|
&mut info,
|
|
&mut exists,
|
|
)?
|
|
};
|
|
if !exists.as_bool() || info.is_none() {
|
|
anyhow::bail!("No postscript name found for font face");
|
|
}
|
|
|
|
get_name(info.unwrap(), locale)
|
|
}
|
|
|
|
// https://learn.microsoft.com/en-us/windows/win32/api/dwrite/ne-dwrite-dwrite_font_feature_tag
|
|
fn apply_font_features(
|
|
direct_write_features: &IDWriteTypography,
|
|
features: &FontFeatures,
|
|
) -> Result<()> {
|
|
let tag_values = features.tag_value_list();
|
|
if tag_values.is_empty() {
|
|
return Ok(());
|
|
}
|
|
|
|
// All of these features are enabled by default by DirectWrite.
|
|
// If you want to (and can) peek into the source of DirectWrite
|
|
let mut feature_liga = make_direct_write_feature("liga", 1);
|
|
let mut feature_clig = make_direct_write_feature("clig", 1);
|
|
let mut feature_calt = make_direct_write_feature("calt", 1);
|
|
|
|
for (tag, value) in tag_values {
|
|
if tag.as_str() == "liga" && *value == 0 {
|
|
feature_liga.parameter = 0;
|
|
continue;
|
|
}
|
|
if tag.as_str() == "clig" && *value == 0 {
|
|
feature_clig.parameter = 0;
|
|
continue;
|
|
}
|
|
if tag.as_str() == "calt" && *value == 0 {
|
|
feature_calt.parameter = 0;
|
|
continue;
|
|
}
|
|
|
|
unsafe {
|
|
direct_write_features.AddFontFeature(make_direct_write_feature(&tag, *value))?;
|
|
}
|
|
}
|
|
unsafe {
|
|
direct_write_features.AddFontFeature(feature_liga)?;
|
|
direct_write_features.AddFontFeature(feature_clig)?;
|
|
direct_write_features.AddFontFeature(feature_calt)?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
#[inline]
|
|
const fn make_direct_write_feature(feature_name: &str, parameter: u32) -> DWRITE_FONT_FEATURE {
|
|
let tag = make_direct_write_tag(feature_name);
|
|
DWRITE_FONT_FEATURE {
|
|
nameTag: tag,
|
|
parameter,
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
const fn make_open_type_tag(tag_name: &str) -> u32 {
|
|
let bytes = tag_name.as_bytes();
|
|
debug_assert!(bytes.len() == 4);
|
|
u32::from_le_bytes([bytes[0], bytes[1], bytes[2], bytes[3]])
|
|
}
|
|
|
|
#[inline]
|
|
const fn make_direct_write_tag(tag_name: &str) -> DWRITE_FONT_FEATURE_TAG {
|
|
DWRITE_FONT_FEATURE_TAG(make_open_type_tag(tag_name))
|
|
}
|
|
|
|
#[inline]
|
|
fn get_name(string: IDWriteLocalizedStrings, locale: &str) -> Result<String> {
|
|
let mut locale_name_index = 0u32;
|
|
let mut exists = BOOL(0);
|
|
unsafe {
|
|
string.FindLocaleName(
|
|
&HSTRING::from(locale),
|
|
&mut locale_name_index,
|
|
&mut exists as _,
|
|
)?
|
|
};
|
|
if !exists.as_bool() {
|
|
unsafe {
|
|
string.FindLocaleName(
|
|
DEFAULT_LOCALE_NAME,
|
|
&mut locale_name_index as _,
|
|
&mut exists as _,
|
|
)?
|
|
};
|
|
anyhow::ensure!(exists.as_bool(), "No localised string for {locale}");
|
|
}
|
|
|
|
let name_length = unsafe { string.GetStringLength(locale_name_index) }? as usize;
|
|
let mut name_vec = vec![0u16; name_length + 1];
|
|
unsafe {
|
|
string.GetString(locale_name_index, &mut name_vec)?;
|
|
}
|
|
|
|
Ok(String::from_utf16_lossy(&name_vec[..name_length]))
|
|
}
|
|
|
|
fn get_system_ui_font_name() -> SharedString {
|
|
unsafe {
|
|
let mut info: LOGFONTW = std::mem::zeroed();
|
|
let font_family = if SystemParametersInfoW(
|
|
SPI_GETICONTITLELOGFONT,
|
|
std::mem::size_of::<LOGFONTW>() as u32,
|
|
Some(&mut info as *mut _ as _),
|
|
SYSTEM_PARAMETERS_INFO_UPDATE_FLAGS(0),
|
|
)
|
|
.log_err()
|
|
.is_none()
|
|
{
|
|
// https://learn.microsoft.com/en-us/windows/win32/uxguide/vis-fonts
|
|
// Segoe UI is the Windows font intended for user interface text strings.
|
|
"Segoe UI".into()
|
|
} else {
|
|
let font_name = String::from_utf16_lossy(&info.lfFaceName);
|
|
font_name.trim_matches(char::from(0)).to_owned().into()
|
|
};
|
|
log::info!("Use {} as UI font.", font_family);
|
|
font_family
|
|
}
|
|
}
|
|
|
|
// One would think that with newer DirectWrite method: IDWriteFontFace4::GetGlyphImageFormats
|
|
// but that doesn't seem to work for some glyphs, say ❤
|
|
fn is_color_glyph(
|
|
font_face: &IDWriteFontFace3,
|
|
glyph_id: GlyphId,
|
|
factory: &IDWriteFactory5,
|
|
) -> bool {
|
|
let glyph_run = DWRITE_GLYPH_RUN {
|
|
fontFace: unsafe { std::mem::transmute_copy(font_face) },
|
|
fontEmSize: 14.0,
|
|
glyphCount: 1,
|
|
glyphIndices: &(glyph_id.0 as u16),
|
|
glyphAdvances: &0.0,
|
|
glyphOffsets: &DWRITE_GLYPH_OFFSET {
|
|
advanceOffset: 0.0,
|
|
ascenderOffset: 0.0,
|
|
},
|
|
isSideways: BOOL(0),
|
|
bidiLevel: 0,
|
|
};
|
|
unsafe {
|
|
factory.TranslateColorGlyphRun(
|
|
Vector2::default(),
|
|
&glyph_run as _,
|
|
None,
|
|
DWRITE_GLYPH_IMAGE_FORMATS_COLR
|
|
| DWRITE_GLYPH_IMAGE_FORMATS_SVG
|
|
| DWRITE_GLYPH_IMAGE_FORMATS_PNG
|
|
| DWRITE_GLYPH_IMAGE_FORMATS_JPEG
|
|
| DWRITE_GLYPH_IMAGE_FORMATS_PREMULTIPLIED_B8G8R8A8,
|
|
DWRITE_MEASURING_MODE_NATURAL,
|
|
None,
|
|
0,
|
|
)
|
|
}
|
|
.is_ok()
|
|
}
|
|
|
|
const DEFAULT_LOCALE_NAME: PCWSTR = windows::core::w!("en-US");
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use crate::platform::windows::direct_write::ClusterAnalyzer;
|
|
|
|
#[test]
|
|
fn test_cluster_map() {
|
|
let cluster_map = [0];
|
|
let mut analyzer = ClusterAnalyzer::new(&cluster_map, 1);
|
|
let next = analyzer.next();
|
|
assert_eq!(next, Some((1, 1)));
|
|
let next = analyzer.next();
|
|
assert_eq!(next, None);
|
|
|
|
let cluster_map = [0, 1, 2];
|
|
let mut analyzer = ClusterAnalyzer::new(&cluster_map, 3);
|
|
let next = analyzer.next();
|
|
assert_eq!(next, Some((1, 1)));
|
|
let next = analyzer.next();
|
|
assert_eq!(next, Some((1, 1)));
|
|
let next = analyzer.next();
|
|
assert_eq!(next, Some((1, 1)));
|
|
let next = analyzer.next();
|
|
assert_eq!(next, None);
|
|
// 👨👩👧👦👩💻
|
|
let cluster_map = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 4, 4, 4];
|
|
let mut analyzer = ClusterAnalyzer::new(&cluster_map, 5);
|
|
let next = analyzer.next();
|
|
assert_eq!(next, Some((11, 4)));
|
|
let next = analyzer.next();
|
|
assert_eq!(next, Some((5, 1)));
|
|
let next = analyzer.next();
|
|
assert_eq!(next, None);
|
|
// 👩💻
|
|
let cluster_map = [0, 0, 0, 0, 0];
|
|
let mut analyzer = ClusterAnalyzer::new(&cluster_map, 1);
|
|
let next = analyzer.next();
|
|
assert_eq!(next, Some((5, 1)));
|
|
let next = analyzer.next();
|
|
assert_eq!(next, None);
|
|
}
|
|
}
|