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Factor the text paragraph rendering code out into a separate class so it 

can be reused
This commit is contained in:
Patrick Walton 2018-04-03 13:57:46 -07:00
parent 6ba87277c2
commit 2fde232982
2 changed files with 346 additions and 318 deletions
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339
demo/client/src/text-demo.ts
View File

@ -1,6 +1,6 @@
// pathfinder/client/src/text-demo.ts
//
// Copyright © 2017 The Pathfinder Project Developers.
// Copyright © 2018 The Pathfinder Project Developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
@ -14,8 +14,8 @@ import * as _ from 'lodash';
import * as opentype from 'opentype.js';
import {Metrics} from 'opentype.js';
import {AntialiasingStrategy, AntialiasingStrategyName, NoAAStrategy} from "./aa-strategy";
import {StemDarkeningMode, SubpixelAAType} from './aa-strategy';
import {AntialiasingStrategy, AntialiasingStrategyName, NoAAStrategy} from "./aa-strategy";
import {AAOptions, DemoAppController, setSwitchInputsValue, SwitchInputs} from './app-controller';
import {Atlas, ATLAS_SIZE, AtlasGlyph, GlyphKey, SUBPIXEL_GRANULARITY} from './atlas';
import PathfinderBufferTexture from './buffer-texture';
@ -29,6 +29,7 @@ import SSAAStrategy from './ssaa-strategy';
import {calculatePixelRectForGlyph, PathfinderFont} from "./text";
import {BUILTIN_FONT_URI, calculatePixelXMin, computeStemDarkeningAmount} from "./text";
import {GlyphStore, Hint, SimpleTextLayout, UnitMetrics} from "./text";
import {SimpleTextLayoutRenderContext, SimpleTextLayoutRenderer} from './text-renderer';
import {TextRenderContext, TextRenderer} from './text-renderer';
import {assert, expectNotNull, panic, PathfinderError, scaleRect, UINT32_SIZE} from './utils';
import {unwrapNull} from './utils';
@ -337,7 +338,7 @@ class TextDemoController extends DemoAppController<TextDemoView> {
}
}
class TextDemoView extends DemoView implements TextRenderContext {
class TextDemoView extends DemoView implements SimpleTextLayoutRenderContext {
renderer: TextDemoRenderer;
appController: TextDemoController;
@ -382,6 +383,22 @@ class TextDemoView extends DemoView implements TextRenderContext {
return this.appController.useHinting;
}
get layout(): SimpleTextLayout {
return this.appController.layout;
}
get rotationAngle(): number {
return this.appController.rotationAngle;
}
get emboldenAmount(): number {
return this.appController.emboldenAmount;
}
get unitsPerEm(): number {
return this.appController.unitsPerEm;
}
protected get camera(): OrthographicCamera {
return this.renderer.camera;
}
@ -441,322 +458,8 @@ class TextDemoView extends DemoView implements TextRenderContext {
}
}
class TextDemoRenderer extends TextRenderer {
class TextDemoRenderer extends SimpleTextLayoutRenderer {
renderContext!: TextDemoView;
glyphPositionsBuffer!: WebGLBuffer;
glyphTexCoordsBuffer!: WebGLBuffer;
glyphElementsBuffer!: WebGLBuffer;
private glyphBounds!: Float32Array;
get layout(): SimpleTextLayout {
return this.renderContext.appController.layout;
}
get backgroundColor(): glmatrix.vec4 {
return glmatrix.vec4.create();
}
get rotationAngle(): number {
return this.renderContext.appController.rotationAngle;
}
protected get extraEmboldenAmount(): glmatrix.vec2 {
const appController = this.renderContext.appController;
const emboldenLength = appController.emboldenAmount * appController.unitsPerEm;
return glmatrix.vec2.clone([emboldenLength, emboldenLength]);
}
prepareToAttachText(): void {
if (this.atlasFramebuffer == null)
this.createAtlasFramebuffer();
this.layoutText();
}
finishAttachingText(): void {
this.buildGlyphs();
this.renderContext.setDirty();
}
setAntialiasingOptions(aaType: AntialiasingStrategyName,
aaLevel: number,
aaOptions: AAOptions):
void {
super.setAntialiasingOptions(aaType, aaLevel, aaOptions);
// Need to relayout because changing AA options can cause font dilation to change...
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
relayoutText(): void {
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
updateHinting(): void {
// Need to relayout the text because the pixel bounds of the glyphs can change from this...
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
updateEmboldenAmount(): void {
// Likewise, need to relayout the text.
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
viewPanned(): void {
this.buildGlyphs();
this.renderContext.setDirty();
}
protected compositeIfNecessary(): void {
const renderContext = this.renderContext;
const gl = renderContext.gl;
// Set up composite state.
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.viewport(0, 0, renderContext.cameraView.width, renderContext.cameraView.height);
gl.disable(gl.DEPTH_TEST);
gl.disable(gl.SCISSOR_TEST);
gl.blendEquation(gl.FUNC_REVERSE_SUBTRACT);
gl.blendFuncSeparate(gl.ONE, gl.ONE, gl.ZERO, gl.ONE);
gl.enable(gl.BLEND);
// Clear.
gl.clearColor(1.0, 1.0, 1.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
// Set the appropriate program.
const programName = this.gammaCorrectionMode === 'off' ? 'blitLinear' : 'blitGamma';
const blitProgram = this.renderContext.shaderPrograms[programName];
// Set up the composite VAO.
const attributes = blitProgram.attributes;
gl.useProgram(blitProgram.program);
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphPositionsBuffer);
gl.vertexAttribPointer(attributes.aPosition, 2, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphTexCoordsBuffer);
gl.vertexAttribPointer(attributes.aTexCoord, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(attributes.aPosition);
gl.enableVertexAttribArray(attributes.aTexCoord);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.glyphElementsBuffer);
// Create the transform.
const transform = glmatrix.mat4.create();
glmatrix.mat4.fromTranslation(transform, [-1.0, -1.0, 0.0]);
glmatrix.mat4.scale(transform, transform, [
2.0 / this.renderContext.cameraView.width,
2.0 / this.renderContext.cameraView.height,
1.0,
]);
glmatrix.mat4.translate(transform,
transform,
[this.camera.translation[0], this.camera.translation[1], 0.0]);
// Blit.
gl.uniformMatrix4fv(blitProgram.uniforms.uTransform, false, transform);
gl.activeTexture(gl.TEXTURE0);
const destTexture = this.renderContext
.atlas
.ensureTexture(this.renderContext);
gl.bindTexture(gl.TEXTURE_2D, destTexture);
gl.uniform1i(blitProgram.uniforms.uSource, 0);
this.setIdentityTexScaleUniform(blitProgram.uniforms);
this.bindGammaLUT(glmatrix.vec3.clone([1.0, 1.0, 1.0]), 1, blitProgram.uniforms);
const totalGlyphCount = this.layout.textFrame.totalGlyphCount;
gl.drawElements(gl.TRIANGLES, totalGlyphCount * 6, gl.UNSIGNED_INT, 0);
}
private layoutText(): void {
const renderContext = this.renderContext;
const gl = renderContext.gl;
this.layout.layoutRuns();
const textBounds = this.layout.textFrame.bounds;
this.camera.bounds = textBounds;
const totalGlyphCount = this.layout.textFrame.totalGlyphCount;
const glyphPositions = new Float32Array(totalGlyphCount * 8);
const glyphIndices = new Uint32Array(totalGlyphCount * 6);
const hint = this.createHint();
const pixelsPerUnit = this.pixelsPerUnit;
const rotationAngle = this.rotationAngle;
let globalGlyphIndex = 0;
for (const run of this.layout.textFrame.runs) {
run.recalculatePixelRects(pixelsPerUnit,
rotationAngle,
hint,
this.emboldenAmount,
SUBPIXEL_GRANULARITY,
textBounds);
for (let glyphIndex = 0;
glyphIndex < run.glyphIDs.length;
glyphIndex++, globalGlyphIndex++) {
const rect = run.pixelRectForGlyphAt(glyphIndex);
glyphPositions.set([
rect[0], rect[3],
rect[2], rect[3],
rect[0], rect[1],
rect[2], rect[1],
], globalGlyphIndex * 8);
for (let glyphIndexIndex = 0;
glyphIndexIndex < QUAD_ELEMENTS.length;
glyphIndexIndex++) {
glyphIndices[glyphIndexIndex + globalGlyphIndex * 6] =
QUAD_ELEMENTS[glyphIndexIndex] + 4 * globalGlyphIndex;
}
}
}
this.glyphPositionsBuffer = unwrapNull(gl.createBuffer());
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphPositionsBuffer);
gl.bufferData(gl.ARRAY_BUFFER, glyphPositions, gl.STATIC_DRAW);
this.glyphElementsBuffer = unwrapNull(gl.createBuffer());
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.glyphElementsBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, glyphIndices, gl.STATIC_DRAW);
}
private buildGlyphs(): void {
const font = this.renderContext.font;
const glyphStore = this.renderContext.glyphStore;
const pixelsPerUnit = this.pixelsPerUnit;
const rotationAngle = this.rotationAngle;
const textFrame = this.layout.textFrame;
const textBounds = textFrame.bounds;
const hint = this.createHint();
// Only build glyphs in view.
const translation = this.camera.translation;
const canvasRect = glmatrix.vec4.clone([
-translation[0],
-translation[1],
-translation[0] + this.renderContext.cameraView.width,
-translation[1] + this.renderContext.cameraView.height,
]);
const atlasGlyphs = [];
for (const run of textFrame.runs) {
for (let glyphIndex = 0; glyphIndex < run.glyphIDs.length; glyphIndex++) {
const pixelRect = run.pixelRectForGlyphAt(glyphIndex);
if (!rectsIntersect(pixelRect, canvasRect))
continue;
const glyphID = run.glyphIDs[glyphIndex];
const glyphStoreIndex = glyphStore.indexOfGlyphWithID(glyphID);
if (glyphStoreIndex == null)
continue;
const subpixel = run.subpixelForGlyphAt(glyphIndex,
pixelsPerUnit,
rotationAngle,
hint,
SUBPIXEL_GRANULARITY,
textBounds);
const glyphKey = new GlyphKey(glyphID, subpixel);
atlasGlyphs.push(new AtlasGlyph(glyphStoreIndex, glyphKey));
}
}
this.buildAtlasGlyphs(atlasGlyphs);
// TODO(pcwalton): Regenerate the IBOs to include only the glyphs we care about.
this.setGlyphTexCoords();
}
private setGlyphTexCoords(): void {
const gl = this.renderContext.gl;
const textFrame = this.layout.textFrame;
const textBounds = textFrame.bounds;
const font = this.renderContext.font;
const atlasGlyphs = this.renderContext.atlasGlyphs;
const hint = this.createHint();
const pixelsPerUnit = this.pixelsPerUnit;
const rotationAngle = this.rotationAngle;
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,
pixelsPerUnit,
rotationAngle,
hint,
SUBPIXEL_GRANULARITY,
textBounds);
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,
rotationAngle,
this.emboldenAmount);
const atlasGlyphPixelOrigin =
atlasGlyph.calculateSubpixelOrigin(pixelsPerUnit);
const atlasGlyphRect = calculatePixelRectForGlyph(atlasGlyphUnitMetrics,
atlasGlyphPixelOrigin,
pixelsPerUnit,
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(gl.createBuffer());
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphTexCoordsBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.glyphBounds, gl.STATIC_DRAW);
}
private setIdentityTexScaleUniform(uniforms: UniformMap): void {
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];
}
function main(): void {

325
demo/client/src/text-renderer.ts
View File

@ -13,6 +13,7 @@ import * as _ from 'lodash';
import {AntialiasingStrategy, AntialiasingStrategyName, NoAAStrategy} from './aa-strategy';
import {StemDarkeningMode, SubpixelAAType} from './aa-strategy';
import {AAOptions} from './app-controller';
import {Atlas, ATLAS_SIZE, AtlasGlyph, GlyphKey, SUBPIXEL_GRANULARITY} from './atlas';
import {CameraView, OrthographicCamera} from './camera';
import {createFramebuffer, createFramebufferDepthTexture, QUAD_ELEMENTS} from './gl-utils';
@ -322,3 +323,327 @@ export abstract class TextRenderer extends Renderer {
return 'directInterior';
}
}
export interface SimpleTextLayoutRenderContext extends TextRenderContext {
readonly layout: SimpleTextLayout;
readonly rotationAngle: number;
readonly emboldenAmount: number;
readonly unitsPerEm: number;
}
export abstract class SimpleTextLayoutRenderer extends TextRenderer {
abstract get renderContext(): SimpleTextLayoutRenderContext;
glyphPositionsBuffer!: WebGLBuffer;
glyphTexCoordsBuffer!: WebGLBuffer;
glyphElementsBuffer!: WebGLBuffer;
private glyphBounds!: Float32Array;
get layout(): SimpleTextLayout {
return this.renderContext.layout;
}
get backgroundColor(): glmatrix.vec4 {
return glmatrix.vec4.create();
}
get rotationAngle(): number {
return this.renderContext.rotationAngle;
}
protected get extraEmboldenAmount(): glmatrix.vec2 {
const emboldenLength = this.renderContext.emboldenAmount * this.renderContext.unitsPerEm;
return glmatrix.vec2.clone([emboldenLength, emboldenLength]);
}
prepareToAttachText(): void {
if (this.atlasFramebuffer == null)
this.createAtlasFramebuffer();
this.layoutText();
}
finishAttachingText(): void {
this.buildGlyphs();
this.renderContext.setDirty();
}
setAntialiasingOptions(aaType: AntialiasingStrategyName,
aaLevel: number,
aaOptions: AAOptions):
void {
super.setAntialiasingOptions(aaType, aaLevel, aaOptions);
// Need to relayout because changing AA options can cause font dilation to change...
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
relayoutText(): void {
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
updateHinting(): void {
// Need to relayout the text because the pixel bounds of the glyphs can change from this...
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
updateEmboldenAmount(): void {
// Likewise, need to relayout the text.
this.layoutText();
this.buildGlyphs();
this.renderContext.setDirty();
}
viewPanned(): void {
this.buildGlyphs();
this.renderContext.setDirty();
}
protected compositeIfNecessary(): void {
const renderContext = this.renderContext;
const gl = renderContext.gl;
// Set up composite state.
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.viewport(0, 0, renderContext.cameraView.width, renderContext.cameraView.height);
gl.disable(gl.DEPTH_TEST);
gl.disable(gl.SCISSOR_TEST);
gl.blendEquation(gl.FUNC_REVERSE_SUBTRACT);
gl.blendFuncSeparate(gl.ONE, gl.ONE, gl.ZERO, gl.ONE);
gl.enable(gl.BLEND);
// Clear.
gl.clearColor(1.0, 1.0, 1.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
// Set the appropriate program.
const programName = this.gammaCorrectionMode === 'off' ? 'blitLinear' : 'blitGamma';
const blitProgram = this.renderContext.shaderPrograms[programName];
// Set up the composite VAO.
const attributes = blitProgram.attributes;
gl.useProgram(blitProgram.program);
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphPositionsBuffer);
gl.vertexAttribPointer(attributes.aPosition, 2, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphTexCoordsBuffer);
gl.vertexAttribPointer(attributes.aTexCoord, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(attributes.aPosition);
gl.enableVertexAttribArray(attributes.aTexCoord);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.glyphElementsBuffer);
// Create the transform.
const transform = glmatrix.mat4.create();
glmatrix.mat4.fromTranslation(transform, [-1.0, -1.0, 0.0]);
glmatrix.mat4.scale(transform, transform, [
2.0 / this.renderContext.cameraView.width,
2.0 / this.renderContext.cameraView.height,
1.0,
]);
glmatrix.mat4.translate(transform,
transform,
[this.camera.translation[0], this.camera.translation[1], 0.0]);
// Blit.
gl.uniformMatrix4fv(blitProgram.uniforms.uTransform, false, transform);
gl.activeTexture(gl.TEXTURE0);
const destTexture = this.renderContext
.atlas
.ensureTexture(this.renderContext);
gl.bindTexture(gl.TEXTURE_2D, destTexture);
gl.uniform1i(blitProgram.uniforms.uSource, 0);
this.setIdentityTexScaleUniform(blitProgram.uniforms);
this.bindGammaLUT(glmatrix.vec3.clone([1.0, 1.0, 1.0]), 1, blitProgram.uniforms);
const totalGlyphCount = this.layout.textFrame.totalGlyphCount;
gl.drawElements(gl.TRIANGLES, totalGlyphCount * 6, gl.UNSIGNED_INT, 0);
}
private layoutText(): void {
const renderContext = this.renderContext;
const gl = renderContext.gl;
this.layout.layoutRuns();
const textBounds = this.layout.textFrame.bounds;
this.camera.bounds = textBounds;
const totalGlyphCount = this.layout.textFrame.totalGlyphCount;
const glyphPositions = new Float32Array(totalGlyphCount * 8);
const glyphIndices = new Uint32Array(totalGlyphCount * 6);
const hint = this.createHint();
const pixelsPerUnit = this.pixelsPerUnit;
const rotationAngle = this.rotationAngle;
let globalGlyphIndex = 0;
for (const run of this.layout.textFrame.runs) {
run.recalculatePixelRects(pixelsPerUnit,
rotationAngle,
hint,
this.emboldenAmount,
SUBPIXEL_GRANULARITY,
textBounds);
for (let glyphIndex = 0;
glyphIndex < run.glyphIDs.length;
glyphIndex++, globalGlyphIndex++) {
const rect = run.pixelRectForGlyphAt(glyphIndex);
glyphPositions.set([
rect[0], rect[3],
rect[2], rect[3],
rect[0], rect[1],
rect[2], rect[1],
], globalGlyphIndex * 8);
for (let glyphIndexIndex = 0;
glyphIndexIndex < QUAD_ELEMENTS.length;
glyphIndexIndex++) {
glyphIndices[glyphIndexIndex + globalGlyphIndex * 6] =
QUAD_ELEMENTS[glyphIndexIndex] + 4 * globalGlyphIndex;
}
}
}
this.glyphPositionsBuffer = unwrapNull(gl.createBuffer());
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphPositionsBuffer);
gl.bufferData(gl.ARRAY_BUFFER, glyphPositions, gl.STATIC_DRAW);
this.glyphElementsBuffer = unwrapNull(gl.createBuffer());
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.glyphElementsBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, glyphIndices, gl.STATIC_DRAW);
}
private buildGlyphs(): void {
const font = this.renderContext.font;
const glyphStore = this.renderContext.glyphStore;
const pixelsPerUnit = this.pixelsPerUnit;
const rotationAngle = this.rotationAngle;
const textFrame = this.layout.textFrame;
const textBounds = textFrame.bounds;
const hint = this.createHint();
// Only build glyphs in view.
const translation = this.camera.translation;
const canvasRect = glmatrix.vec4.clone([
-translation[0],
-translation[1],
-translation[0] + this.renderContext.cameraView.width,
-translation[1] + this.renderContext.cameraView.height,
]);
const atlasGlyphs = [];
for (const run of textFrame.runs) {
for (let glyphIndex = 0; glyphIndex < run.glyphIDs.length; glyphIndex++) {
const pixelRect = run.pixelRectForGlyphAt(glyphIndex);
if (!rectsIntersect(pixelRect, canvasRect))
continue;
const glyphID = run.glyphIDs[glyphIndex];
const glyphStoreIndex = glyphStore.indexOfGlyphWithID(glyphID);
if (glyphStoreIndex == null)
continue;
const subpixel = run.subpixelForGlyphAt(glyphIndex,
pixelsPerUnit,
rotationAngle,
hint,
SUBPIXEL_GRANULARITY,
textBounds);
const glyphKey = new GlyphKey(glyphID, subpixel);
atlasGlyphs.push(new AtlasGlyph(glyphStoreIndex, glyphKey));
}
}
this.buildAtlasGlyphs(atlasGlyphs);
// TODO(pcwalton): Regenerate the IBOs to include only the glyphs we care about.
this.setGlyphTexCoords();
}
private setGlyphTexCoords(): void {
const gl = this.renderContext.gl;
const textFrame = this.layout.textFrame;
const textBounds = textFrame.bounds;
const font = this.renderContext.font;
const atlasGlyphs = this.renderContext.atlasGlyphs;
const hint = this.createHint();
const pixelsPerUnit = this.pixelsPerUnit;
const rotationAngle = this.rotationAngle;
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,
pixelsPerUnit,
rotationAngle,
hint,
SUBPIXEL_GRANULARITY,
textBounds);
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,
rotationAngle,
this.emboldenAmount);
const atlasGlyphPixelOrigin =
atlasGlyph.calculateSubpixelOrigin(pixelsPerUnit);
const atlasGlyphRect = calculatePixelRectForGlyph(atlasGlyphUnitMetrics,
atlasGlyphPixelOrigin,
pixelsPerUnit,
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(gl.createBuffer());
gl.bindBuffer(gl.ARRAY_BUFFER, this.glyphTexCoordsBuffer);
gl.bufferData(gl.ARRAY_BUFFER, this.glyphBounds, gl.STATIC_DRAW);
}
private setIdentityTexScaleUniform(uniforms: UniformMap): void {
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];
}