use std::{ borrow::Cow, ffi::{c_uint, c_void}, mem::ManuallyDrop, }; use ::util::{ResultExt, maybe}; use anyhow::{Context, Result}; use collections::HashMap; use parking_lot::{RwLock, RwLockUpgradableReadGuard}; use windows::{ Win32::{ Foundation::*, Globalization::GetUserDefaultLocaleName, Graphics::{ Direct3D::D3D_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP, Direct3D11::*, DirectWrite::*, Dxgi::Common::*, Gdi::LOGFONTW, }, System::SystemServices::LOCALE_NAME_MAX_LENGTH, UI::WindowsAndMessaging::*, }, core::*, }; use windows_numerics::Vector2; use crate::*; use gpui::*; #[derive(Debug)] struct FontInfo { font_family_h: HSTRING, font_face: IDWriteFontFace3, features: IDWriteTypography, fallbacks: Option, font_collection: IDWriteFontCollection1, } pub(crate) struct DirectWriteTextSystem { components: DirectWriteComponents, state: RwLock, } struct DirectWriteComponents { locale: HSTRING, factory: IDWriteFactory5, in_memory_loader: IDWriteInMemoryFontFileLoader, builder: IDWriteFontSetBuilder1, text_renderer: TextRendererWrapper, system_ui_font_name: SharedString, system_subpixel_rendering: bool, } impl Drop for DirectWriteComponents { fn drop(&mut self) { unsafe { let _ = self .factory .UnregisterFontFileLoader(&self.in_memory_loader); } } } struct GPUState { device: ID3D11Device, device_context: ID3D11DeviceContext, sampler: Option, blend_state: ID3D11BlendState, vertex_shader: ID3D11VertexShader, pixel_shader: ID3D11PixelShader, } struct DirectWriteState { gpu_state: GPUState, system_font_collection: IDWriteFontCollection1, custom_font_collection: IDWriteFontCollection1, fonts: Vec, font_to_font_id: HashMap, font_info_cache: HashMap, layout_line_scratch: Vec, } impl GPUState { fn new(directx_devices: &DirectXDevices) -> Result { let device = directx_devices.device.clone(); let device_context = directx_devices.device_context.clone(); let blend_state = { let mut blend_state = None; let desc = D3D11_BLEND_DESC { AlphaToCoverageEnable: false.into(), IndependentBlendEnable: false.into(), RenderTarget: [ D3D11_RENDER_TARGET_BLEND_DESC { BlendEnable: true.into(), SrcBlend: D3D11_BLEND_ONE, DestBlend: D3D11_BLEND_INV_SRC_ALPHA, BlendOp: D3D11_BLEND_OP_ADD, SrcBlendAlpha: D3D11_BLEND_ONE, DestBlendAlpha: D3D11_BLEND_INV_SRC_ALPHA, BlendOpAlpha: D3D11_BLEND_OP_ADD, RenderTargetWriteMask: D3D11_COLOR_WRITE_ENABLE_ALL.0 as u8, }, Default::default(), Default::default(), Default::default(), Default::default(), Default::default(), Default::default(), Default::default(), ], }; unsafe { device.CreateBlendState(&desc, Some(&mut blend_state)) }?; blend_state.unwrap() }; let sampler = { let mut sampler = None; let desc = D3D11_SAMPLER_DESC { Filter: D3D11_FILTER_MIN_MAG_MIP_POINT, AddressU: D3D11_TEXTURE_ADDRESS_BORDER, AddressV: D3D11_TEXTURE_ADDRESS_BORDER, AddressW: D3D11_TEXTURE_ADDRESS_BORDER, MipLODBias: 0.0, MaxAnisotropy: 1, ComparisonFunc: D3D11_COMPARISON_ALWAYS, BorderColor: [0.0, 0.0, 0.0, 0.0], MinLOD: 0.0, MaxLOD: 0.0, }; unsafe { device.CreateSamplerState(&desc, Some(&mut sampler)) }?; sampler }; let vertex_shader = { let source = shader_resources::RawShaderBytes::new( shader_resources::ShaderModule::EmojiRasterization, shader_resources::ShaderTarget::Vertex, )?; let mut shader = None; unsafe { device.CreateVertexShader(source.as_bytes(), None, Some(&mut shader)) }?; shader.unwrap() }; let pixel_shader = { let source = shader_resources::RawShaderBytes::new( shader_resources::ShaderModule::EmojiRasterization, shader_resources::ShaderTarget::Fragment, )?; let mut shader = None; unsafe { device.CreatePixelShader(source.as_bytes(), None, Some(&mut shader)) }?; shader.unwrap() }; Ok(Self { device, device_context, sampler, blend_state, vertex_shader, pixel_shader, }) } } impl DirectWriteTextSystem { pub(crate) fn new(directx_devices: &DirectXDevices) -> Result { let factory: IDWriteFactory5 = unsafe { DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED)? }; // The `IDWriteInMemoryFontFileLoader` here is supported starting from // Windows 10 Creators Update, which consequently requires the entire // `DirectWriteTextSystem` to run on `win10 1703`+. let in_memory_loader = unsafe { factory.CreateInMemoryFontFileLoader()? }; unsafe { factory.RegisterFontFileLoader(&in_memory_loader)? }; let builder = unsafe { factory.CreateFontSetBuilder()? }; let mut locale = [0u16; LOCALE_NAME_MAX_LENGTH as usize]; unsafe { GetUserDefaultLocaleName(&mut locale) }; let locale = HSTRING::from_wide(&locale); let text_renderer = TextRendererWrapper::new(locale.clone()); let gpu_state = GPUState::new(directx_devices)?; let system_subpixel_rendering = get_system_subpixel_rendering(); let system_ui_font_name = get_system_ui_font_name(); let components = DirectWriteComponents { locale, factory, in_memory_loader, builder, text_renderer, system_ui_font_name, system_subpixel_rendering, }; let system_font_collection = unsafe { let mut result = None; components .factory .GetSystemFontCollection(false, &mut result, true)?; result.context("Failed to get system font collection")? }; let custom_font_set = unsafe { components.builder.CreateFontSet()? }; let custom_font_collection = unsafe { components .factory .CreateFontCollectionFromFontSet(&custom_font_set)? }; Ok(Self { components, state: RwLock::new(DirectWriteState { gpu_state, system_font_collection, custom_font_collection, fonts: Vec::new(), font_to_font_id: HashMap::default(), font_info_cache: HashMap::default(), layout_line_scratch: Vec::new(), }), }) } pub(crate) fn handle_gpu_lost(&self, directx_devices: &DirectXDevices) -> Result<()> { self.state.write().handle_gpu_lost(directx_devices) } } impl PlatformTextSystem for DirectWriteTextSystem { fn add_fonts(&self, fonts: Vec>) -> Result<()> { self.state.write().add_fonts(&self.components, fonts) } fn all_font_names(&self) -> Vec { self.state.read().all_font_names(&self.components) } fn font_id(&self, font: &Font) -> Result { let lock = self.state.upgradable_read(); if let Some(font_id) = lock.font_to_font_id.get(font) { Ok(*font_id) } else { RwLockUpgradableReadGuard::upgrade(lock) .select_and_cache_font(&self.components, font) .with_context(|| format!("Failed to select font: {:?}", font)) } } fn font_metrics(&self, font_id: FontId) -> FontMetrics { self.state.read().font_metrics(font_id) } fn typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> Result> { self.state.read().get_typographic_bounds(font_id, glyph_id) } fn advance(&self, font_id: FontId, glyph_id: GlyphId) -> anyhow::Result> { self.state.read().get_advance(font_id, glyph_id) } fn glyph_for_char(&self, font_id: FontId, ch: char) -> Option { self.state.read().glyph_for_char(font_id, ch) } fn glyph_raster_bounds( &self, params: &RenderGlyphParams, ) -> anyhow::Result> { self.state.read().raster_bounds(&self.components, params) } fn rasterize_glyph( &self, params: &RenderGlyphParams, raster_bounds: Bounds, ) -> anyhow::Result<(Size, Vec)> { self.state .read() .rasterize_glyph(&self.components, params, raster_bounds) } fn layout_line(&self, text: &str, font_size: Pixels, runs: &[FontRun]) -> LineLayout { self.state .write() .layout_line(&self.components, text, font_size, runs) .log_err() .unwrap_or(LineLayout { font_size, ..Default::default() }) } fn recommended_rendering_mode( &self, _font_id: FontId, _font_size: Pixels, ) -> TextRenderingMode { if self.components.system_subpixel_rendering { TextRenderingMode::Subpixel } else { TextRenderingMode::Grayscale } } } impl DirectWriteState { fn select_and_cache_font( &mut self, components: &DirectWriteComponents, font: &Font, ) -> Option { let select_font = |this: &mut DirectWriteState, font: &Font| -> Option { let info = [&this.custom_font_collection, &this.system_font_collection] .into_iter() .find_map(|font_collection| unsafe { DirectWriteState::make_font_from_font_collection( font, font_collection, &components.factory, &this.system_font_collection, &components.system_ui_font_name, ) })?; let font_id = FontId(this.fonts.len()); let font_face_key = info.font_face.cast::().unwrap().as_raw().addr(); this.fonts.push(info); this.font_info_cache.insert(font_face_key, font_id); Some(font_id) }; let mut font_id = select_font(self, font); if font_id.is_none() { // try updating system fonts and reselect let mut collection = None; let font_collection_updated = unsafe { components .factory .GetSystemFontCollection(false, &mut collection, true) } .log_err() .is_some(); if font_collection_updated && let Some(collection) = collection { self.system_font_collection = collection; } font_id = select_font(self, font); }; let font_id = font_id?; self.font_to_font_id.insert(font.clone(), font_id); Some(font_id) } fn add_fonts( &mut self, components: &DirectWriteComponents, fonts: Vec>, ) -> Result<()> { for font_data in fonts { match font_data { Cow::Borrowed(data) => unsafe { let font_file = components .in_memory_loader .CreateInMemoryFontFileReference( &components.factory, data.as_ptr().cast(), data.len() as _, None, )?; components.builder.AddFontFile(&font_file)?; }, Cow::Owned(data) => unsafe { let font_file = components .in_memory_loader .CreateInMemoryFontFileReference( &components.factory, data.as_ptr().cast(), data.len() as _, None, )?; components.builder.AddFontFile(&font_file)?; }, } } let set = unsafe { components.builder.CreateFontSet()? }; let collection = unsafe { components.factory.CreateFontCollectionFromFontSet(&set)? }; self.custom_font_collection = collection; Ok(()) } fn generate_font_fallbacks( fallbacks: &FontFallbacks, factory: &IDWriteFactory5, system_font_collection: &IDWriteFontCollection1, ) -> Result> { let fallback_list = fallbacks.fallback_list(); if fallback_list.is_empty() { return Ok(None); } unsafe { let builder = factory.CreateFontFallbackBuilder()?; let font_set = &system_font_collection.GetFontSet()?; let mut unicode_ranges = Vec::new(); for family_name in fallback_list { let family_name = HSTRING::from(family_name); let Some(fonts) = font_set .GetMatchingFonts( &family_name, DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STRETCH_NORMAL, DWRITE_FONT_STYLE_NORMAL, ) .log_err() else { continue; }; let Ok(font_face) = fonts.GetFontFaceReference(0) else { continue; }; let font = font_face.CreateFontFace()?; let mut count = 0; font.GetUnicodeRanges(None, &mut count).ok(); if count == 0 { continue; } unicode_ranges.clear(); unicode_ranges.resize_with(count as usize, DWRITE_UNICODE_RANGE::default); let Some(_) = font .GetUnicodeRanges(Some(&mut unicode_ranges), &mut count) .log_err() else { continue; }; builder.AddMapping( &unicode_ranges, &[family_name.as_ptr()], None, None, None, 1.0, )?; } let system_fallbacks = factory.GetSystemFontFallback()?; builder.AddMappings(&system_fallbacks)?; Ok(Some(builder.CreateFontFallback()?)) } } unsafe fn generate_font_features( factory: &IDWriteFactory5, font_features: &FontFeatures, ) -> Result { let direct_write_features = unsafe { factory.CreateTypography()? }; apply_font_features(&direct_write_features, font_features)?; Ok(direct_write_features) } unsafe fn make_font_from_font_collection( &Font { ref family, ref features, ref fallbacks, weight, style, }: &Font, collection: &IDWriteFontCollection1, factory: &IDWriteFactory5, system_font_collection: &IDWriteFontCollection1, system_ui_font_name: &SharedString, ) -> Option { const SYSTEM_UI_FONT_NAME: &str = ".SystemUIFont"; let family = if family == SYSTEM_UI_FONT_NAME { system_ui_font_name } else { gpui::font_name_with_fallbacks_shared(&family, &system_ui_font_name) }; let fontset = unsafe { collection.GetFontSet().log_err()? }; let font_family_h = HSTRING::from(family.as_str()); let font = unsafe { fontset .GetMatchingFonts( &font_family_h, font_weight_to_dwrite(weight), DWRITE_FONT_STRETCH_NORMAL, font_style_to_dwrite(style), ) .log_err()? }; let total_number = unsafe { font.GetFontCount() }; for index in 0..total_number { let res = maybe!({ let font_face_ref = unsafe { font.GetFontFaceReference(index).log_err()? }; let font_face = unsafe { font_face_ref.CreateFontFace().log_err()? }; let direct_write_features = unsafe { Self::generate_font_features(factory, features).log_err()? }; let fallbacks = fallbacks.as_ref().and_then(|fallbacks| { Self::generate_font_fallbacks(fallbacks, factory, system_font_collection) .log_err() .flatten() }); let font_info = FontInfo { font_family_h: font_family_h.clone(), font_face, features: direct_write_features, fallbacks, font_collection: collection.clone(), }; Some(font_info) }); if res.is_some() { return res; } } None } fn layout_line( &mut self, components: &DirectWriteComponents, text: &str, font_size: Pixels, font_runs: &[FontRun], ) -> Result { if font_runs.is_empty() { return Ok(LineLayout { font_size, ..Default::default() }); } unsafe { self.layout_line_scratch.clear(); self.layout_line_scratch.extend(text.encode_utf16()); let text_wide = &*self.layout_line_scratch; 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 = &font_info.font_collection; let format: IDWriteTextFormat1 = components .factory .CreateTextFormat( &font_info.font_family_h, collection, font_info.font_face.GetWeight(), font_info.font_face.GetStyle(), DWRITE_FONT_STRETCH_NORMAL, font_size.as_f32(), &components.locale, )? .cast()?; if let Some(ref fallbacks) = font_info.fallbacks { format.SetFontFallback(fallbacks)?; } let layout = 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 (ascent, descent) = { let mut first_metrics = [DWRITE_LINE_METRICS::default(); 4]; let mut line_count = 0u32; text_layout.GetLineMetrics(Some(&mut first_metrics), &mut line_count)?; ( px(first_metrics[0].baseline), px(first_metrics[0].height - first_metrics[0].baseline), ) }; let mut break_ligatures = true; for run in &font_runs[1..] { 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 = &font_info.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(&font_info.font_family_h, text_range)?; let font_size = if break_ligatures { font_size.as_f32().next_up() } else { font_size.as_f32() }; text_layout.SetFontSize(font_size, 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)?; break_ligatures = !break_ligatures; } let mut runs = Vec::new(); let renderer_context = RendererContext { text_system: self, components, index_converter: StringIndexConverter::new(text), runs: &mut runs, width: 0.0, }; text_layout.Draw( Some((&raw const renderer_context).cast::()), &components.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, components: &DirectWriteComponents, params: &RenderGlyphParams, ) -> Result { 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: ManuallyDrop::new(Some(unsafe { std::ptr::read(&***font.font_face) })), fontEmSize: params.font_size.as_f32(), 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 baseline_origin_x = params.subpixel_variant.x as f32 / SUBPIXEL_VARIANTS_X as f32 / params.scale_factor; let baseline_origin_y = params.subpixel_variant.y as f32 / gpui::SUBPIXEL_VARIANTS_Y as f32 / 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.as_f32(), // Using 96 as scale is applied by the transform 96.0, 96.0, Some(&transform), false, DWRITE_OUTLINE_THRESHOLD_ANTIALIASED, DWRITE_MEASURING_MODE_NATURAL, None, &mut rendering_mode, &mut grid_fit_mode, )?; } let rendering_mode = match rendering_mode { DWRITE_RENDERING_MODE1_OUTLINE => DWRITE_RENDERING_MODE1_NATURAL_SYMMETRIC, m => m, }; let antialias_mode = if params.subpixel_rendering { DWRITE_TEXT_ANTIALIAS_MODE_CLEARTYPE } else { DWRITE_TEXT_ANTIALIAS_MODE_GRAYSCALE }; let glyph_analysis = unsafe { components.factory.CreateGlyphRunAnalysis( &glyph_run, Some(&transform), rendering_mode, DWRITE_MEASURING_MODE_NATURAL, grid_fit_mode, antialias_mode, baseline_origin_x, baseline_origin_y, ) }?; Ok(glyph_analysis) } fn raster_bounds( &self, components: &DirectWriteComponents, params: &RenderGlyphParams, ) -> Result> { let glyph_analysis = self.create_glyph_run_analysis(components, params)?; let texture_type = if params.subpixel_rendering { DWRITE_TEXTURE_CLEARTYPE_3x1 } else { DWRITE_TEXTURE_ALIASED_1x1 }; let bounds = unsafe { glyph_analysis.GetAlphaTextureBounds(texture_type)? }; 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 { let font_info = &self.fonts[font_id.0]; let codepoints = ch as u32; let mut glyph_indices = 0u16; unsafe { font_info .font_face .GetGlyphIndices(&raw const codepoints, 1, &raw mut glyph_indices) .log_err() } .map(|_| GlyphId(glyph_indices as u32)) } fn rasterize_glyph( &self, components: &DirectWriteComponents, params: &RenderGlyphParams, glyph_bounds: Bounds, ) -> Result<(Size, Vec)> { 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(components, params, glyph_bounds) { color } else { let monochrome = self.rasterize_monochrome(components, params, glyph_bounds)?; monochrome .into_iter() .flat_map(|pixel| [0, 0, 0, pixel]) .collect::>() } } else { self.rasterize_monochrome(components, params, glyph_bounds)? }; Ok((glyph_bounds.size, bitmap_data)) } fn rasterize_monochrome( &self, components: &DirectWriteComponents, params: &RenderGlyphParams, glyph_bounds: Bounds, ) -> Result> { let glyph_analysis = self.create_glyph_run_analysis(components, params)?; if !params.subpixel_rendering { let mut bitmap_data = vec![0u8; glyph_bounds.size.width.0 as usize * glyph_bounds.size.height.0 as usize]; unsafe { glyph_analysis.CreateAlphaTexture( DWRITE_TEXTURE_ALIASED_1x1, &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, )?; } return Ok(bitmap_data); } let width = glyph_bounds.size.width.0 as usize; let height = glyph_bounds.size.height.0 as usize; let pixel_count = width * height; let mut bitmap_data = vec![0u8; pixel_count * 4]; unsafe { glyph_analysis.CreateAlphaTexture( 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[..pixel_count * 3], )?; } // The output buffer expects RGBA data, so pad the alpha channel with zeros. for pixel_ix in (0..pixel_count).rev() { let src = pixel_ix * 3; let dst = pixel_ix * 4; ( bitmap_data[dst], bitmap_data[dst + 1], bitmap_data[dst + 2], bitmap_data[dst + 3], ) = ( bitmap_data[src], bitmap_data[src + 1], bitmap_data[src + 2], 0, ); } Ok(bitmap_data) } fn rasterize_color( &self, components: &DirectWriteComponents, params: &RenderGlyphParams, glyph_bounds: Bounds, ) -> Result> { let bitmap_size = glyph_bounds.size; let subpixel_shift = params .subpixel_variant .map(|v| v as f32 / SUBPIXEL_VARIANTS_X 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: ManuallyDrop::new(Some(unsafe { std::ptr::read(&***font.font_face) })), fontEmSize: params.font_size.as_f32(), 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 { 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(); let mut alpha_data = 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 { 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_GRAYSCALE, baseline_origin_x, baseline_origin_y, ) }?; let color_bounds = unsafe { color_analysis.GetAlphaTextureBounds(DWRITE_TEXTURE_ALIASED_1x1) }?; 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 { alpha_data.clear(); alpha_data.resize((color_size.width * color_size.height) as usize, 0); unsafe { color_analysis.CreateAlphaTexture( DWRITE_TEXTURE_ALIASED_1x1, &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); glyph_layers.push(GlyphLayerTexture::new( &self.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.gpu_state; let params_buffer = { let desc = D3D11_BUFFER_DESC { ByteWidth: std::mem::size_of::() 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(std::slice::from_ref(¶ms_buffer))) }; unsafe { device_context.PSSetConstantBuffers(0, Some(std::slice::from_ref(¶ms_buffer))) }; unsafe { device_context.OMSetRenderTargets(Some(std::slice::from_ref(&render_target_view)), None) }; unsafe { device_context.PSSetSamplers(0, Some(std::slice::from_ref(&gpu_state.sampler))) }; unsafe { device_context.OMSetBlendState(&gpu_state.blend_state, None, 0xffffffff) }; let crate::FontInfo { gamma_ratios, grayscale_enhanced_contrast, .. } = DirectXRenderer::get_font_info(); for layer in glyph_layers { let params = GlyphLayerTextureParams { run_color: layer.run_color, bounds: layer.bounds, gamma_ratios: *gamma_ratios, grayscale_enhanced_contrast: *grayscale_enhanced_contrast, _pad: [0f32; 3], }; unsafe { let mut dest = std::mem::zeroed(); gpu_state.device_context.Map( params_buffer.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.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::( (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::()), width * std::mem::size_of::(), ) }; } // Convert from premultiplied to straight alpha for chunk in rasterized.chunks_exact_mut(4) { let b = chunk[0] as f32; let g = chunk[1] as f32; let r = chunk[2] as f32; let a = chunk[3] as f32; if a > 0.0 { let inv_a = 255.0 / a; chunk[0] = (b * inv_a).clamp(0.0, 255.0) as u8; chunk[1] = (g * inv_a).clamp(0.0, 255.0) as u8; chunk[2] = (r * inv_a).clamp(0.0, 255.0) as u8; } } Ok(rasterized) } fn get_typographic_bounds(&self, font_id: FontId, glyph_id: GlyphId) -> Result> { 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> { 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, components: &DirectWriteComponents) -> Vec { let mut result = get_font_names_from_collection(&self.system_font_collection, &components.locale); result.extend(get_font_names_from_collection( &self.custom_font_collection, &components.locale, )); result } fn handle_gpu_lost(&mut self, directx_devices: &DirectXDevices) -> Result<()> { try_to_recover_from_device_lost(|| { GPUState::new(directx_devices).context("Recreating GPU state for DirectWrite") }) .map(|gpu_state| self.gpu_state = gpu_state) } } struct GlyphLayerTexture { run_color: Rgba, bounds: Bounds, texture_view: ID3D11ShaderResourceView, // holding on to the texture to not RAII drop it _texture: ID3D11Texture2D, } impl GlyphLayerTexture { fn new( gpu_state: &GPUState, run_color: Rgba, bounds: Bounds, alpha_data: &[u8], ) -> Result { 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_R8_UNORM, SampleDesc: DXGI_SAMPLE_DESC { Count: 1, Quality: 0, }, Usage: D3D11_USAGE_DEFAULT, BindFlags: D3D11_BIND_SHADER_RESOURCE.0 as u32, CPUAccessFlags: 0, MiscFlags: 0, }; let texture = { let mut texture: Option = None; unsafe { gpu_state .device .CreateTexture2D(&desc, None, Some(&mut texture))? }; texture.unwrap() }; let texture_view = { let mut view: Option = 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 as u32, 0, ) }; Ok(GlyphLayerTexture { run_color, bounds, texture_view, _texture: texture, }) } } #[repr(C)] struct GlyphLayerTextureParams { bounds: Bounds, run_color: Rgba, gamma_ratios: [f32; 4], grayscale_enhanced_contrast: f32, _pad: [f32; 3], } struct TextRendererWrapper(IDWriteTextRenderer); impl TextRendererWrapper { fn new(locale_str: HSTRING) -> Self { let inner = TextRenderer::new(locale_str); TextRendererWrapper(inner.into()) } } #[implement(IDWriteTextRenderer)] struct TextRenderer { locale: HSTRING, } impl TextRenderer { fn new(locale: HSTRING) -> Self { TextRenderer { locale } } } struct RendererContext<'t, 'a, 'b> { text_system: &'t mut DirectWriteState, components: &'a DirectWriteComponents, index_converter: StringIndexConverter<'a>, runs: &'b mut Vec, width: f32, } #[derive(Debug)] struct ClusterAnalyzer<'t> { utf16_idx: usize, glyph_idx: usize, glyph_count: usize, cluster_map: &'t [u16], } impl<'t> ClusterAnalyzer<'t> { 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 { 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 { 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::Result<()> { let glyphrun = unsafe { &*glyphrun }; let glyph_count = glyphrun.glyphCount as usize; if glyph_count == 0 { return Ok(()); } let desc = unsafe { &*glyphrundescription }; let context = unsafe { &mut *(clientdrawingcontext.cast::().cast_mut()) }; let Some(font_face) = glyphrun.fontFace.as_ref() else { return Ok(()); }; // This `cast()` action here should never fail since we are running on Win10+, and // `IDWriteFontFace3` requires Win10 let Ok(font_face) = &font_face.cast::() else { return Err(Error::new( DWRITE_E_UNSUPPORTEDOPERATION, "Failed to cast font face", )); }; let font_face_key = font_face.cast::().unwrap().as_raw().addr(); let font_id = context .text_system .font_info_cache .get(&font_face_key) .copied() // in some circumstances, we might be getting served a FontFace that we did not create ourselves // so create a new font from it and cache it accordingly. The usual culprit here seems to be Segoe UI Symbol .map_or_else( || { let font = font_face_to_font(font_face, &self.locale) .ok_or_else(|| Error::new(DWRITE_E_NOFONT, "Failed to create font"))?; let font_id = match context.text_system.font_to_font_id.get(&font) { Some(&font_id) => font_id, None => context .text_system .select_and_cache_font(context.components, &font) .ok_or_else(|| Error::new(DWRITE_E_NOFONT, "Failed to create font"))?, }; context .text_system .font_info_cache .insert(font_face_key, font_id); windows::core::Result::Ok(font_id) }, Ok, )?; let color_font = unsafe { font_face.IsColorFont().as_bool() }; 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 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.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(-glyph_offsets[this_glyph_idx].ascenderOffset), ), 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::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::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, _issideways: BOOL, _isrighttoleft: BOOL, _clientdrawingeffect: windows::core::Ref, ) -> 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(); } } fn font_style_to_dwrite(style: FontStyle) -> DWRITE_FONT_STYLE { match style { FontStyle::Normal => DWRITE_FONT_STYLE_NORMAL, FontStyle::Italic => DWRITE_FONT_STYLE_ITALIC, FontStyle::Oblique => DWRITE_FONT_STYLE_OBLIQUE, } } fn font_style_from_dwrite(value: DWRITE_FONT_STYLE) -> FontStyle { match value.0 { 0 => FontStyle::Normal, 1 => FontStyle::Italic, 2 => FontStyle::Oblique, _ => unreachable!(), } } fn font_weight_to_dwrite(weight: FontWeight) -> DWRITE_FONT_WEIGHT { DWRITE_FONT_WEIGHT(weight.0 as i32) } fn font_weight_from_dwrite(value: DWRITE_FONT_WEIGHT) -> FontWeight { FontWeight(value.0 as f32) } fn get_font_names_from_collection( collection: &IDWriteFontCollection1, locale: &HSTRING, ) -> Vec { 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 font_face_to_font(font_face: &IDWriteFontFace3, locale: &HSTRING) -> Option { 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() }; Some(Font { family: family_name.into(), features: FontFeatures::default(), weight: font_weight_from_dwrite(weight), style: font_style_from_dwrite(style), fallbacks: None, }) } // 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: &HSTRING) -> Result { let mut locale_name_index = 0u32; let mut exists = BOOL(0); unsafe { string.FindLocaleName(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_subpixel_rendering() -> bool { let mut value = c_uint::default(); let result = unsafe { SystemParametersInfoW( SPI_GETFONTSMOOTHINGTYPE, 0, Some((&mut value) as *mut c_uint as *mut c_void), SYSTEM_PARAMETERS_INFO_UPDATE_FLAGS::default(), ) }; if result.log_err().is_some() { value == FE_FONTSMOOTHINGCLEARTYPE } else { true } } 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::() 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 โค fn is_color_glyph( font_face: &IDWriteFontFace3, glyph_id: GlyphId, factory: &IDWriteFactory5, ) -> bool { let glyph_run = DWRITE_GLYPH_RUN { fontFace: ManuallyDrop::new(Some(unsafe { std::ptr::read(&****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::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); // ๐Ÿ‘จโ€๐Ÿ‘ฉโ€๐Ÿ‘งโ€๐Ÿ‘ฆ๐Ÿ‘ฉโ€๐Ÿ’ป 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); // ๐Ÿ‘ฉโ€๐Ÿ’ป 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); } }