564 lines
23 KiB
TypeScript
564 lines
23 KiB
TypeScript
// pathfinder/client/src/text-renderer.ts
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//
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// Copyright © 2017 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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import * as glmatrix from 'gl-matrix';
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import * as _ from 'lodash';
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import {AntialiasingStrategy, AntialiasingStrategyName, NoAAStrategy} from './aa-strategy';
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import {StemDarkeningMode, SubpixelAAType} from './aa-strategy';
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import {Atlas, ATLAS_SIZE, AtlasGlyph, GlyphKey, SUBPIXEL_GRANULARITY} from './atlas';
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import {OrthographicCamera} from './camera';
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import {createFramebuffer, createFramebufferDepthTexture, QUAD_ELEMENTS, UniformMap} from './gl-utils';
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import {Renderer} from './renderer';
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import {ShaderMap} from './shader-loader';
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import SSAAStrategy from './ssaa-strategy';
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import {calculatePixelRectForGlyph, computeStemDarkeningAmount, GlyphStore, Hint} from "./text";
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import {PathfinderFont, SimpleTextLayout, UnitMetrics} from "./text";
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import {unwrapNull} from './utils';
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import {RenderContext, Timings} from "./view";
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import {AdaptiveMonochromeXCAAStrategy} from './xcaa-strategy';
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interface AntialiasingStrategyTable {
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none: typeof NoAAStrategy;
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ssaa: typeof SSAAStrategy;
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xcaa: typeof AdaptiveMonochromeXCAAStrategy;
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}
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const MIN_SCALE: number = 0.0025;
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const MAX_SCALE: number = 0.5;
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const ANTIALIASING_STRATEGIES: AntialiasingStrategyTable = {
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none: NoAAStrategy,
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ssaa: SSAAStrategy,
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xcaa: AdaptiveMonochromeXCAAStrategy,
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};
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export interface TextRenderContext extends RenderContext {
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atlasGlyphs: AtlasGlyph[];
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readonly atlas: Atlas;
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readonly layout: SimpleTextLayout;
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readonly glyphStore: GlyphStore;
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readonly font: PathfinderFont;
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readonly fontSize: number;
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readonly pathCount: number;
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readonly layoutPixelsPerUnit: number;
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readonly useHinting: boolean;
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// TODO(pcwalton): Remove this.
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readonly canvas: HTMLCanvasElement;
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newTimingsReceived(timings: Timings): void;
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}
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export class TextRenderer extends Renderer {
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renderContext: TextRenderContext;
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camera: OrthographicCamera;
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atlasFramebuffer: WebGLFramebuffer;
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atlasDepthTexture: WebGLTexture;
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glyphPositionsBuffer: WebGLBuffer;
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glyphTexCoordsBuffer: WebGLBuffer;
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glyphElementsBuffer: WebGLBuffer;
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get destFramebuffer(): WebGLFramebuffer {
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return this.atlasFramebuffer;
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}
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get destAllocatedSize(): glmatrix.vec2 {
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return ATLAS_SIZE;
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}
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get destUsedSize(): glmatrix.vec2 {
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return this.renderContext.atlas.usedSize;
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}
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get emboldenAmount(): glmatrix.vec2 {
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return this.stemDarkeningAmount;
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}
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get bgColor(): glmatrix.vec4 {
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return glmatrix.vec4.fromValues(1.0, 1.0, 1.0, 0.0);
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}
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get fgColor(): glmatrix.vec4 {
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return glmatrix.vec4.fromValues(0.0, 0.0, 0.0, 1.0);
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}
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protected get worldTransform(): glmatrix.mat4 {
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const transform = glmatrix.mat4.create();
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glmatrix.mat4.translate(transform, transform, [-1.0, -1.0, 0.0]);
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glmatrix.mat4.scale(transform, transform, [2.0 / ATLAS_SIZE[0], 2.0 / ATLAS_SIZE[1], 1.0]);
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return transform;
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}
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protected get directCurveProgramName(): keyof ShaderMap<void> {
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return 'directCurve';
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}
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protected get directInteriorProgramName(): keyof ShaderMap<void> {
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return 'directInterior';
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}
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protected get depthFunction(): number {
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return this.renderContext.gl.GREATER;
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}
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protected get usedSizeFactor(): glmatrix.vec2 {
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const usedSize = glmatrix.vec2.create();
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glmatrix.vec2.div(usedSize, this.renderContext.atlas.usedSize, ATLAS_SIZE);
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return usedSize;
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}
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private get stemDarkeningAmount(): glmatrix.vec2 {
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if (this.stemDarkening === 'dark') {
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return computeStemDarkeningAmount(this.renderContext.fontSize,
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this.renderContext.layoutPixelsPerUnit);
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}
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return glmatrix.vec2.create();
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}
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private glyphBounds: Float32Array;
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private stemDarkening: StemDarkeningMode;
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private subpixelAA: SubpixelAAType;
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private get displayPixelsPerUnit(): number {
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return this.renderContext.layoutPixelsPerUnit;
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}
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constructor(renderContext: TextRenderContext) {
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super(renderContext);
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this.camera = new OrthographicCamera(this.renderContext.canvas, {
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maxScale: MAX_SCALE,
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minScale: MIN_SCALE,
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});
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}
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setAntialiasingOptions(aaType: AntialiasingStrategyName,
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aaLevel: number,
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subpixelAA: SubpixelAAType,
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stemDarkening: StemDarkeningMode) {
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super.setAntialiasingOptions(aaType, aaLevel, subpixelAA, stemDarkening);
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// Need to relayout because changing AA options can cause font dilation to change...
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this.layoutText();
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this.buildAtlasGlyphs();
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this.renderContext.setDirty();
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}
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setHintsUniform(uniforms: UniformMap): void {
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const hint = this.createHint();
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this.renderContext.gl.uniform4f(uniforms.uHints,
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hint.xHeight,
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hint.hintedXHeight,
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hint.stemHeight,
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hint.hintedStemHeight);
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}
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prepareToAttachText(): void {
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if (this.atlasFramebuffer == null)
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this.createAtlasFramebuffer();
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this.layoutText();
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}
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finishAttachingText(): void {
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this.buildAtlasGlyphs();
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this.renderContext.setDirty();
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}
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relayoutText(): void {
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this.layoutText();
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this.buildAtlasGlyphs();
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this.renderContext.setDirty();
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}
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updateHinting(): void {
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// Need to relayout the text because the pixel bounds of the glyphs can change from this...
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this.layoutText();
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this.buildAtlasGlyphs();
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this.renderContext.setDirty();
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}
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viewPanned(): void {
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this.buildAtlasGlyphs();
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this.renderContext.setDirty();
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}
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pathBoundingRects(objectIndex: number): Float32Array {
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const pathCount = this.renderContext.pathCount;
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const atlasGlyphs = this.renderContext.atlasGlyphs;
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const pixelsPerUnit = this.displayPixelsPerUnit;
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const font = this.renderContext.font;
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const hint = this.createHint();
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const boundingRects = new Float32Array((pathCount + 1) * 4);
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for (const glyph of atlasGlyphs) {
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const atlasGlyphMetrics = font.metricsForGlyph(glyph.glyphKey.id);
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if (atlasGlyphMetrics == null)
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continue;
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const atlasUnitMetrics = new UnitMetrics(atlasGlyphMetrics, this.stemDarkeningAmount);
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const pathID = glyph.pathID;
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boundingRects[pathID * 4 + 0] = atlasUnitMetrics.left;
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boundingRects[pathID * 4 + 1] = atlasUnitMetrics.descent;
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boundingRects[pathID * 4 + 2] = atlasUnitMetrics.right;
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boundingRects[pathID * 4 + 3] = atlasUnitMetrics.ascent;
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}
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return boundingRects;
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}
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protected createAAStrategy(aaType: AntialiasingStrategyName,
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aaLevel: number,
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subpixelAA: SubpixelAAType,
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stemDarkening: StemDarkeningMode):
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AntialiasingStrategy {
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this.subpixelAA = subpixelAA;
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this.stemDarkening = stemDarkening;
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return new (ANTIALIASING_STRATEGIES[aaType])(aaLevel, subpixelAA);
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}
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protected clearForDirectRendering(): void {
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this.renderContext.gl.clearColor(0.0, 0.0, 0.0, 0.0);
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this.renderContext.gl.clearDepth(0.0);
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this.renderContext.gl.depthMask(true);
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this.renderContext.gl.clear(this.renderContext.gl.COLOR_BUFFER_BIT |
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this.renderContext.gl.DEPTH_BUFFER_BIT);
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}
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protected compositeIfNecessary() {
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// Set up composite state.
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this.renderContext.gl.bindFramebuffer(this.renderContext.gl.FRAMEBUFFER, null);
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this.renderContext.gl.viewport(0, 0, this.renderContext.canvas.width, this.renderContext.canvas.height);
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this.renderContext.gl.disable(this.renderContext.gl.DEPTH_TEST);
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this.renderContext.gl.disable(this.renderContext.gl.SCISSOR_TEST);
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this.renderContext.gl.blendEquation(this.renderContext.gl.FUNC_ADD);
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this.renderContext.gl.blendFuncSeparate(this.renderContext.gl.SRC_ALPHA,
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this.renderContext.gl.ONE_MINUS_SRC_ALPHA,
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this.renderContext.gl.ONE,
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this.renderContext.gl.ONE);
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this.renderContext.gl.enable(this.renderContext.gl.BLEND);
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// Clear.
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this.renderContext.gl.clearColor(1.0, 1.0, 1.0, 1.0);
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this.renderContext.gl.clear(this.renderContext.gl.COLOR_BUFFER_BIT);
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// Set up the composite VAO.
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const blitProgram = this.renderContext.shaderPrograms.blit;
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const attributes = blitProgram.attributes;
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this.renderContext.gl.useProgram(blitProgram.program);
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this.renderContext.gl.bindBuffer(this.renderContext.gl.ARRAY_BUFFER,
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this.glyphPositionsBuffer);
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this.renderContext.gl.vertexAttribPointer(attributes.aPosition,
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2,
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this.renderContext.gl.FLOAT,
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false,
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0,
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0);
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this.renderContext.gl.bindBuffer(this.renderContext.gl.ARRAY_BUFFER,
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this.glyphTexCoordsBuffer);
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this.renderContext.gl.vertexAttribPointer(attributes.aTexCoord,
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2,
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this.renderContext.gl.FLOAT,
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false,
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0,
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0);
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this.renderContext.gl.enableVertexAttribArray(attributes.aPosition);
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this.renderContext.gl.enableVertexAttribArray(attributes.aTexCoord);
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this.renderContext.gl.bindBuffer(this.renderContext.gl.ELEMENT_ARRAY_BUFFER,
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this.glyphElementsBuffer);
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// Create the transform.
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const transform = glmatrix.mat4.create();
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glmatrix.mat4.fromTranslation(transform, [-1.0, -1.0, 0.0]);
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glmatrix.mat4.scale(transform, transform, [
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2.0 / this.renderContext.canvas.width,
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2.0 / this.renderContext.canvas.height,
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1.0,
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]);
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glmatrix.mat4.translate(transform,
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transform,
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[this.camera.translation[0], this.camera.translation[1], 0.0]);
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// Blit.
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this.renderContext.gl.uniformMatrix4fv(blitProgram.uniforms.uTransform, false, transform);
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this.renderContext.gl.activeTexture(this.renderContext.gl.TEXTURE0);
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const destTexture = this.renderContext
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.atlas
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.ensureTexture(this.renderContext);
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this.renderContext.gl.bindTexture(this.renderContext.gl.TEXTURE_2D, destTexture);
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this.renderContext.gl.uniform1i(blitProgram.uniforms.uSource, 0);
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this.setIdentityTexScaleUniform(blitProgram.uniforms);
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const totalGlyphCount = this.renderContext.layout.textFrame.totalGlyphCount;
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this.renderContext.gl.drawElements(this.renderContext.gl.TRIANGLES,
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totalGlyphCount * 6,
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this.renderContext.gl.UNSIGNED_INT,
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0);
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}
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protected pathColorsForObject(objectIndex: number): Uint8Array {
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const pathCount = this.renderContext.pathCount;
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const pathColors = new Uint8Array(4 * (pathCount + 1));
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for (let pathIndex = 0; pathIndex < pathCount; pathIndex++) {
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for (let channel = 0; channel < 3; channel++)
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pathColors[(pathIndex + 1) * 4 + channel] = 0x00; // RGB
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pathColors[(pathIndex + 1) * 4 + 3] = 0xff; // alpha
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}
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return pathColors;
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}
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protected pathTransformsForObject(objectIndex: number): Float32Array {
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const pathCount = this.renderContext.pathCount;
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const atlasGlyphs = this.renderContext.atlasGlyphs;
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const pixelsPerUnit = this.displayPixelsPerUnit;
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const transforms = new Float32Array((pathCount + 1) * 4);
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for (const glyph of atlasGlyphs) {
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const pathID = glyph.pathID;
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const atlasOrigin = glyph.calculateSubpixelOrigin(pixelsPerUnit);
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transforms[pathID * 4 + 0] = pixelsPerUnit;
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transforms[pathID * 4 + 1] = pixelsPerUnit;
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transforms[pathID * 4 + 2] = atlasOrigin[0];
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transforms[pathID * 4 + 3] = atlasOrigin[1];
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}
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return transforms;
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}
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protected newTimingsReceived() {
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this.renderContext.newTimingsReceived(this.lastTimings);
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}
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private createAtlasFramebuffer() {
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const atlasColorTexture = this.renderContext.atlas.ensureTexture(this.renderContext);
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this.atlasDepthTexture = createFramebufferDepthTexture(this.renderContext.gl, ATLAS_SIZE);
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this.atlasFramebuffer = createFramebuffer(this.renderContext.gl,
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this.renderContext.drawBuffersExt,
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[atlasColorTexture],
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this.atlasDepthTexture);
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// Allow the antialiasing strategy to set up framebuffers as necessary.
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if (this.antialiasingStrategy != null)
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this.antialiasingStrategy.setFramebufferSize(this);
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}
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private createHint(): Hint {
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return new Hint(this.renderContext.font,
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this.displayPixelsPerUnit,
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this.renderContext.useHinting);
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}
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private layoutText() {
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const layout = this.renderContext.layout;
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layout.layoutRuns();
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const textBounds = layout.textFrame.bounds;
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this.camera.bounds = textBounds;
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const totalGlyphCount = layout.textFrame.totalGlyphCount;
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const glyphPositions = new Float32Array(totalGlyphCount * 8);
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const glyphIndices = new Uint32Array(totalGlyphCount * 6);
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const hint = this.createHint();
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const displayPixelsPerUnit = this.displayPixelsPerUnit;
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const layoutPixelsPerUnit = this.renderContext.layoutPixelsPerUnit;
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let globalGlyphIndex = 0;
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for (const run of layout.textFrame.runs) {
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for (let glyphIndex = 0;
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glyphIndex < run.glyphIDs.length;
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glyphIndex++, globalGlyphIndex++) {
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const rect = run.pixelRectForGlyphAt(glyphIndex,
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layoutPixelsPerUnit,
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displayPixelsPerUnit,
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hint,
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this.stemDarkeningAmount,
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SUBPIXEL_GRANULARITY);
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glyphPositions.set([
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rect[0], rect[3],
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rect[2], rect[3],
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rect[0], rect[1],
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rect[2], rect[1],
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], globalGlyphIndex * 8);
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for (let glyphIndexIndex = 0;
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glyphIndexIndex < QUAD_ELEMENTS.length;
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glyphIndexIndex++) {
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glyphIndices[glyphIndexIndex + globalGlyphIndex * 6] =
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QUAD_ELEMENTS[glyphIndexIndex] + 4 * globalGlyphIndex;
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}
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}
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}
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this.glyphPositionsBuffer = unwrapNull(this.renderContext.gl.createBuffer());
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this.renderContext.gl.bindBuffer(this.renderContext.gl.ARRAY_BUFFER,
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this.glyphPositionsBuffer);
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this.renderContext.gl.bufferData(this.renderContext.gl.ARRAY_BUFFER,
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glyphPositions,
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this.renderContext.gl.STATIC_DRAW);
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this.glyphElementsBuffer = unwrapNull(this.renderContext.gl.createBuffer());
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this.renderContext.gl.bindBuffer(this.renderContext.gl.ELEMENT_ARRAY_BUFFER,
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this.glyphElementsBuffer);
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this.renderContext.gl.bufferData(this.renderContext.gl.ELEMENT_ARRAY_BUFFER,
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glyphIndices,
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this.renderContext.gl.STATIC_DRAW);
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}
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private buildAtlasGlyphs() {
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const font = this.renderContext.font;
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const glyphStore = this.renderContext.glyphStore;
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const layoutPixelsPerUnit = this.renderContext.layoutPixelsPerUnit;
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const displayPixelsPerUnit = this.displayPixelsPerUnit;
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const textFrame = this.renderContext.layout.textFrame;
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const hint = this.createHint();
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// Only build glyphs in view.
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const translation = this.camera.translation;
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const canvasRect = glmatrix.vec4.clone([
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-translation[0],
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-translation[1],
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-translation[0] + this.renderContext.canvas.width,
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-translation[1] + this.renderContext.canvas.height,
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]);
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let atlasGlyphs = [];
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for (const run of textFrame.runs) {
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for (let glyphIndex = 0; glyphIndex < run.glyphIDs.length; glyphIndex++) {
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const pixelRect = run.pixelRectForGlyphAt(glyphIndex,
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layoutPixelsPerUnit,
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displayPixelsPerUnit,
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hint,
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this.stemDarkeningAmount,
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SUBPIXEL_GRANULARITY);
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if (!rectsIntersect(pixelRect, canvasRect))
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continue;
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const glyphID = run.glyphIDs[glyphIndex];
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const glyphStoreIndex = glyphStore.indexOfGlyphWithID(glyphID);
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if (glyphStoreIndex == null)
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continue;
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const subpixel = run.subpixelForGlyphAt(glyphIndex,
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layoutPixelsPerUnit,
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hint,
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SUBPIXEL_GRANULARITY);
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const glyphKey = new GlyphKey(glyphID, subpixel);
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atlasGlyphs.push(new AtlasGlyph(glyphStoreIndex, glyphKey));
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}
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}
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atlasGlyphs.sort((a, b) => a.glyphKey.sortKey - b.glyphKey.sortKey);
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atlasGlyphs = _.sortedUniqBy(atlasGlyphs, glyph => glyph.glyphKey.sortKey);
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if (atlasGlyphs.length === 0)
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return;
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this.renderContext.atlasGlyphs = atlasGlyphs;
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this.renderContext.atlas.layoutGlyphs(atlasGlyphs,
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font,
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displayPixelsPerUnit,
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hint,
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this.stemDarkeningAmount);
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this.uploadPathTransforms(1);
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// TODO(pcwalton): Regenerate the IBOs to include only the glyphs we care about.
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this.setGlyphTexCoords();
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}
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private setGlyphTexCoords() {
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const textFrame = this.renderContext.layout.textFrame;
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const font = this.renderContext.font;
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const atlasGlyphs = this.renderContext.atlasGlyphs;
|
|
|
|
const hint = this.createHint();
|
|
const layoutPixelsPerUnit = this.renderContext.layoutPixelsPerUnit;
|
|
const displayPixelsPerUnit = this.displayPixelsPerUnit;
|
|
|
|
const atlasGlyphKeys = atlasGlyphs.map(atlasGlyph => atlasGlyph.glyphKey.sortKey);
|
|
|
|
this.glyphBounds = new Float32Array(textFrame.totalGlyphCount * 8);
|
|
|
|
let globalGlyphIndex = 0;
|
|
for (const run of textFrame.runs) {
|
|
for (let glyphIndex = 0;
|
|
glyphIndex < run.glyphIDs.length;
|
|
glyphIndex++, globalGlyphIndex++) {
|
|
const textGlyphID = run.glyphIDs[glyphIndex];
|
|
|
|
const subpixel = run.subpixelForGlyphAt(glyphIndex,
|
|
layoutPixelsPerUnit,
|
|
hint,
|
|
SUBPIXEL_GRANULARITY);
|
|
|
|
const glyphKey = new GlyphKey(textGlyphID, subpixel);
|
|
|
|
const atlasGlyphIndex = _.sortedIndexOf(atlasGlyphKeys, glyphKey.sortKey);
|
|
if (atlasGlyphIndex < 0)
|
|
continue;
|
|
|
|
// Set texture coordinates.
|
|
const atlasGlyph = atlasGlyphs[atlasGlyphIndex];
|
|
const atlasGlyphMetrics = font.metricsForGlyph(atlasGlyph.glyphKey.id);
|
|
if (atlasGlyphMetrics == null)
|
|
continue;
|
|
|
|
const atlasGlyphUnitMetrics = new UnitMetrics(atlasGlyphMetrics,
|
|
this.stemDarkeningAmount);
|
|
|
|
const atlasGlyphPixelOrigin =
|
|
atlasGlyph.calculateSubpixelOrigin(displayPixelsPerUnit);
|
|
const atlasGlyphRect = calculatePixelRectForGlyph(atlasGlyphUnitMetrics,
|
|
atlasGlyphPixelOrigin,
|
|
displayPixelsPerUnit,
|
|
hint);
|
|
const atlasGlyphBL = atlasGlyphRect.slice(0, 2) as glmatrix.vec2;
|
|
const atlasGlyphTR = atlasGlyphRect.slice(2, 4) as glmatrix.vec2;
|
|
glmatrix.vec2.div(atlasGlyphBL, atlasGlyphBL, ATLAS_SIZE);
|
|
glmatrix.vec2.div(atlasGlyphTR, atlasGlyphTR, ATLAS_SIZE);
|
|
|
|
this.glyphBounds.set([
|
|
atlasGlyphBL[0], atlasGlyphTR[1],
|
|
atlasGlyphTR[0], atlasGlyphTR[1],
|
|
atlasGlyphBL[0], atlasGlyphBL[1],
|
|
atlasGlyphTR[0], atlasGlyphBL[1],
|
|
], globalGlyphIndex * 8);
|
|
}
|
|
}
|
|
|
|
this.glyphTexCoordsBuffer = unwrapNull(this.renderContext.gl.createBuffer());
|
|
this.renderContext.gl.bindBuffer(this.renderContext.gl.ARRAY_BUFFER,
|
|
this.glyphTexCoordsBuffer);
|
|
this.renderContext.gl.bufferData(this.renderContext.gl.ARRAY_BUFFER,
|
|
this.glyphBounds,
|
|
this.renderContext.gl.STATIC_DRAW);
|
|
}
|
|
|
|
private setIdentityTexScaleUniform(uniforms: UniformMap) {
|
|
this.renderContext.gl.uniform2f(uniforms.uTexScale, 1.0, 1.0);
|
|
}
|
|
}
|
|
|
|
/// The separating axis theorem.
|
|
function rectsIntersect(a: glmatrix.vec4, b: glmatrix.vec4): boolean {
|
|
return a[2] > b[0] && a[3] > b[1] && a[0] < b[2] && a[1] < b[3];
|
|
}
|