<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="preload" href="/clay/fonts/Calistoga-Regular.ttf" as="font" type="font/ttf" crossorigin>
<link rel="preload" href="/clay/fonts/Quicksand-Semibold.ttf" as="font" type="font/ttf" crossorigin>
<title>Clay - UI Layout Library</title>
<style>
html, body {
width: 100%;
height: 100%;
overflow: hidden;
padding: 0;
margin: 0;
pointer-events: none;
background: rgb(244, 235, 230);
}
/* Import the font using @font-face */
@font-face {
font-family: 'Calistoga';
font-style: normal;
font-weight: 400;
src: url('/clay/fonts/Calistoga-Regular.ttf') format('truetype');
}
@font-face {
font-family: 'Quicksand';
font-style: normal;
font-weight: 400;
src: url('/clay/fonts/Quicksand-Semibold.ttf') format('truetype');
}
body > canvas {
width: 100%;
height: 100%;
touch-action: none;
}
div, a, img {
position: absolute;
box-sizing: border-box;
-webkit-backface-visibility: hidden;
pointer-events: none;
}
a {
cursor: pointer;
pointer-events: all;
}
.text {
pointer-events: all;
white-space: pre;
}
/* TODO special exception for text selection in debug tools */
[id='2067877626'] > * {
pointer-events: none !important;
}
</style>
</head>
<script type="module">
const CLAY_RENDER_COMMAND_TYPE_NONE = 0;
const CLAY_RENDER_COMMAND_TYPE_RECTANGLE = 1;
const CLAY_RENDER_COMMAND_TYPE_BORDER = 2;
const CLAY_RENDER_COMMAND_TYPE_TEXT = 3;
const CLAY_RENDER_COMMAND_TYPE_IMAGE = 4;
const CLAY_RENDER_COMMAND_TYPE_SCISSOR_START = 5;
const CLAY_RENDER_COMMAND_TYPE_SCISSOR_END = 6;
const CLAY_RENDER_COMMAND_TYPE_CUSTOM = 7;
const GLOBAL_FONT_SCALING_FACTOR = 0.8;
let renderCommandSize = 0;
let scratchSpaceAddress = 8;
let heapSpaceAddress = 0;
let memoryDataView;
let textDecoder = new TextDecoder("utf-8");
let previousFrameTime;
let fontsById = [
'Quicksand',
'Calistoga',
'Quicksand',
'Quicksand',
'Quicksand',
];
let elementCache = {};
let imageCache = {};
let dimensionsDefinition = { type: 'struct', members: [
{name: 'width', type: 'float'},
{name: 'height', type: 'float'},
]};
let colorDefinition = { type: 'struct', members: [
{name: 'r', type: 'float' },
{name: 'g', type: 'float' },
{name: 'b', type: 'float' },
{name: 'a', type: 'float' },
]};
let stringDefinition = { type: 'struct', members: [
{name: 'length', type: 'uint32_t' },
{name: 'chars', type: 'uint32_t' },
]};
let stringSliceDefinition = { type: 'struct', members: [
{name: 'length', type: 'uint32_t' },
{name: 'chars', type: 'uint32_t' },
{name: 'baseChars', type: 'uint32_t' },
]};
let borderWidthDefinition = { type: 'struct', members: [
{name: 'left', type: 'uint16_t'},
{name: 'right', type: 'uint16_t'},
{name: 'top', type: 'uint16_t'},
{name: 'bottom', type: 'uint16_t'},
{name: 'betweenChildren', type: 'uint16_t'},
]};
let cornerRadiusDefinition = { type: 'struct', members: [
{name: 'topLeft', type: 'float'},
{name: 'topRight', type: 'float'},
{name: 'bottomLeft', type: 'float'},
{name: 'bottomRight', type: 'float'},
]};
let textConfigDefinition = { name: 'text', type: 'struct', members: [
{ name: 'userData', type: 'uint32_t' },
{ name: 'textColor', ...colorDefinition },
{ name: 'fontId', type: 'uint16_t' },
{ name: 'fontSize', type: 'uint16_t' },
{ name: 'letterSpacing', type: 'uint16_t' },
{ name: 'lineSpacing', type: 'uint16_t' },
{ name: 'wrapMode', type: 'uint8_t' },
{ name: 'disablePointerEvents', type: 'uint8_t' },
{ name: '_padding', type: 'uint16_t' },
]};
let textRenderDataDefinition = { type: 'struct', members: [
{ name: 'stringContents', ...stringSliceDefinition },
{ name: 'textColor', ...colorDefinition },
{ name: 'fontId', type: 'uint16_t' },
{ name: 'fontSize', type: 'uint16_t' },
{ name: 'letterSpacing', type: 'uint16_t' },
{ name: 'lineHeight', type: 'uint16_t' },
]};
let rectangleRenderDataDefinition = { type: 'struct', members: [
{ name: 'backgroundColor', ...colorDefinition },
{ name: 'cornerRadius', ...cornerRadiusDefinition },
]};
let imageRenderDataDefinition = { type: 'struct', members: [
{ name: 'backgroundColor', ...colorDefinition },
{ name: 'cornerRadius', ...cornerRadiusDefinition },
{ name: 'sourceDimensions', ...dimensionsDefinition },
{ name: 'imageData', type: 'uint32_t' },
]};
let customRenderDataDefinition = { type: 'struct', members: [
{ name: 'backgroundColor', ...colorDefinition },
{ name: 'cornerRadius', ...cornerRadiusDefinition },
{ name: 'customData', type: 'uint32_t' },
]};
let borderRenderDataDefinition = { type: 'struct', members: [
{ name: 'color', ...colorDefinition },
{ name: 'cornerRadius', ...cornerRadiusDefinition },
{ name: 'width', ...borderWidthDefinition },
{ name: 'padding', type: 'uint16_t'}
]};
let scrollRenderDataDefinition = { type: 'struct', members: [
{ name: 'horizontal', type: 'bool' },
{ name: 'vertical', type: 'bool' },
]};
let customHTMLDataDefinition = { type: 'struct', members: [
{ name: 'link', ...stringDefinition },
{ name: 'cursorPointer', type: 'uint8_t' },
{ name: 'disablePointerEvents', type: 'uint8_t' },
]};
let renderCommandDefinition = {
name: 'CLay_RenderCommand',
type: 'struct',
members: [
{ name: 'boundingBox', type: 'struct', members: [
{ name: 'x', type: 'float' },
{ name: 'y', type: 'float' },
{ name: 'width', type: 'float' },
{ name: 'height', type: 'float' },
]},
{ name: 'renderData', type: 'union', members: [
{ name: 'rectangle', ...rectangleRenderDataDefinition },
{ name: 'text', ...textRenderDataDefinition },
{ name: 'image', ...imageRenderDataDefinition },
{ name: 'custom', ...customRenderDataDefinition },
{ name: 'border', ...borderRenderDataDefinition },
{ name: 'scroll', ...scrollRenderDataDefinition },
]},
{ name: 'userData', type: 'uint32_t'},
{ name: 'id', type: 'uint32_t' },
{ name: 'zIndex', type: 'int16_t' },
{ name: 'commandType', type: 'uint8_t' },
{ name: '_padding', type: 'uint8_t' },
]
};
function getStructTotalSize(definition) {
switch(definition.type) {
case 'union':
case 'struct': {
let totalSize = 0;
for (const member of definition.members) {
let result = getStructTotalSize(member);
if (definition.type === 'struct') {
totalSize += result;
} else {
totalSize = Math.max(totalSize, result);
}
}
return totalSize;
}
case 'float': return 4;
case 'uint32_t': return 4;
case 'int32_t': return 4;
case 'uint16_t': return 2;
case 'int16_t': return 2;
case 'uint8_t': return 1;
case 'bool': return 1;
default: {
throw "Unimplemented C data type " + definition.type
}
}
}
function readStructAtAddress(address, definition) {
switch(definition.type) {
case 'union':
case 'struct': {
let struct = { __size: 0 };
for (const member of definition.members) {
let result = readStructAtAddress(address, member);
struct[member.name] = result;
if (definition.type === 'struct') {
struct.__size += result.__size;
address += result.__size;
} else {
struct.__size = Math.max(struct.__size, result.__size);
}
}
return struct;
}
case 'float': return { value: memoryDataView.getFloat32(address, true), __size: 4 };
case 'uint32_t': return { value: memoryDataView.getUint32(address, true), __size: 4 };
case 'int32_t': return { value: memoryDataView.getUint32(address, true), __size: 4 };
case 'uint16_t': return { value: memoryDataView.getUint16(address, true), __size: 2 };
case 'int16_t': return { value: memoryDataView.getInt16(address, true), __size: 2 };
case 'uint8_t': return { value: memoryDataView.getUint8(address, true), __size: 1 };
case 'bool': return { value: memoryDataView.getUint8(address, true), __size: 1 };
default: {
throw "Unimplemented C data type " + definition.type
}
}
}
function getTextDimensions(text, font) {
// re-use canvas object for better performance
window.canvasContext.font = font;
let metrics = window.canvasContext.measureText(text);
return { width: metrics.width, height: metrics.fontBoundingBoxAscent + metrics.fontBoundingBoxDescent };
}
function createMainArena(arenaStructAddress, arenaMemoryAddress) {
let memorySize = instance.exports.Clay_MinMemorySize();
// Last arg is address to store return value
instance.exports.Clay_CreateArenaWithCapacityAndMemory(arenaStructAddress, memorySize, arenaMemoryAddress);
}
async function init() {
await Promise.all(fontsById.map(f => document.fonts.load(`12px "${f}"`)));
window.htmlRoot = document.body.appendChild(document.createElement('div'));
window.canvasRoot = document.body.appendChild(document.createElement('canvas'));
window.canvasContext = window.canvasRoot.getContext("2d");
window.mousePositionXThisFrame = 0;
window.mousePositionYThisFrame = 0;
window.mouseWheelXThisFrame = 0;
window.mouseWheelYThisFrame = 0;
window.touchDown = false;
window.arrowKeyDownPressedThisFrame = false;
window.arrowKeyUpPressedThisFrame = false;
let zeroTimeout = null;
document.addEventListener("wheel", (event) => {
window.mouseWheelXThisFrame = event.deltaX * -0.1;
window.mouseWheelYThisFrame = event.deltaY * -0.1;
clearTimeout(zeroTimeout);
zeroTimeout = setTimeout(() => {
window.mouseWheelXThisFrame = 0;
window.mouseWheelYThisFrame = 0;
}, 10);
});
function handleTouch (event) {
if (event.touches.length === 1) {
window.touchDown = true;
let target = event.target;
let scrollTop = 0;
let scrollLeft = 0;
let activeRendererIndex = memoryDataView.getUint32(instance.exports.ACTIVE_RENDERER_INDEX.value, true);
while (activeRendererIndex !== 1 && target) {
scrollLeft += target.scrollLeft;
scrollTop += target.scrollTop;
target = target.parentElement;
}
window.mousePositionXThisFrame = event.changedTouches[0].pageX + scrollLeft;
window.mousePositionYThisFrame = event.changedTouches[0].pageY + scrollTop;
}
}
document.addEventListener("touchstart", handleTouch);
document.addEventListener("touchmove", handleTouch);
document.addEventListener("touchend", () => {
window.touchDown = false;
window.mousePositionXThisFrame = 0;
window.mousePositionYThisFrame = 0;
})
document.addEventListener("mousemove", (event) => {
let target = event.target;
let scrollTop = 0;
let scrollLeft = 0;
let activeRendererIndex = memoryDataView.getUint32(instance.exports.ACTIVE_RENDERER_INDEX.value, true);
while (activeRendererIndex !== 1 && target) {
scrollLeft += target.scrollLeft;
scrollTop += target.scrollTop;
target = target.parentElement;
}
window.mousePositionXThisFrame = event.x + scrollLeft;
window.mousePositionYThisFrame = event.y + scrollTop;
});
document.addEventListener("mousedown", (event) => {
window.mouseDown = true;
window.mouseDownThisFrame = true;
});
document.addEventListener("mouseup", (event) => {
window.mouseDown = false;
});
document.addEventListener("keydown", (event) => {
if (event.key === "ArrowDown") {
window.arrowKeyDownPressedThisFrame = true;
}
if (event.key === "ArrowUp") {
window.arrowKeyUpPressedThisFrame = true;
}
if (event.key === "d") {
window.dKeyPressedThisFrame = true;
}
});
const importObject = {
clay: {
measureTextFunction: (addressOfDimensions, textToMeasure, addressOfConfig, userData) => {
let stringLength = memoryDataView.getUint32(textToMeasure, true);
let pointerToString = memoryDataView.getUint32(textToMeasure + 4, true);
let textConfig = readStructAtAddress(addressOfConfig, textConfigDefinition);
let textDecoder = new TextDecoder("utf-8");
let text = textDecoder.decode(memoryDataView.buffer.slice(pointerToString, pointerToString + stringLength));
let sourceDimensions = getTextDimensions(text, `${Math.round(textConfig.fontSize.value * GLOBAL_FONT_SCALING_FACTOR)}px ${fontsById[textConfig.fontId.value]}`);
memoryDataView.setFloat32(addressOfDimensions, sourceDimensions.width, true);
memoryDataView.setFloat32(addressOfDimensions + 4, sourceDimensions.height, true);
},
queryScrollOffsetFunction: (addressOfOffset, elementId) => {
let container = document.getElementById(elementId.toString());
if (container) {
memoryDataView.setFloat32(addressOfOffset, -container.scrollLeft, true);
memoryDataView.setFloat32(addressOfOffset + 4, -container.scrollTop, true);
}
},
},
};
const { instance } = await WebAssembly.instantiateStreaming(
fetch("/clay/index.wasm"), importObject
);
memoryDataView = new DataView(new Uint8Array(instance.exports.memory.buffer).buffer);
scratchSpaceAddress = instance.exports.__heap_base.value;
let clayScratchSpaceAddress = instance.exports.__heap_base.value + 1024;
heapSpaceAddress = instance.exports.__heap_base.value + 2048;
let arenaAddress = scratchSpaceAddress + 8;
window.instance = instance;
createMainArena(arenaAddress, heapSpaceAddress);
memoryDataView.setFloat32(instance.exports.__heap_base.value, window.innerWidth, true);
memoryDataView.setFloat32(instance.exports.__heap_base.value + 4, window.innerHeight, true);
instance.exports.Clay_Initialize(arenaAddress, instance.exports.__heap_base.value);
instance.exports.SetScratchMemory(arenaAddress, clayScratchSpaceAddress);
renderCommandSize = getStructTotalSize(renderCommandDefinition);
renderLoop();
}
function MemoryIsDifferent(one, two, length) {
for (let i = 0; i < length; i++) {
if (one[i] !== two[i]) {
return true;
}
}
return false;
}
function SetElementBackgroundColorAndRadius(element, cornerRadius, backgroundColor) {
element.style.backgroundColor = `rgba(${backgroundColor.r.value}, ${backgroundColor.g.value}, ${backgroundColor.b.value}, ${backgroundColor.a.value / 255})`;
if (cornerRadius.topLeft.value > 0) {
element.style.borderTopLeftRadius = cornerRadius.topLeft.value + 'px';
}
if (cornerRadius.topRight.value > 0) {
element.style.borderTopRightRadius = cornerRadius.topRight.value + 'px';
}
if (cornerRadius.bottomLeft.value > 0) {
element.style.borderBottomLeftRadius = cornerRadius.bottomLeft.value + 'px';
}
if (cornerRadius.bottomRight.value > 0) {
element.style.borderBottomRightRadius = cornerRadius.bottomRight.value + 'px';
}
}
function renderLoopHTML() {
let capacity = memoryDataView.getInt32(scratchSpaceAddress, true);
let length = memoryDataView.getInt32(scratchSpaceAddress + 4, true);
let arrayOffset = memoryDataView.getUint32(scratchSpaceAddress + 8, true);
let scissorStack = [{ nextAllocation: { x: 0, y: 0 }, element: htmlRoot, nextElementIndex: 0 }];
let previousId = 0;
for (let i = 0; i < length; i++, arrayOffset += renderCommandSize) {
let entireRenderCommandMemory = new Uint8Array(memoryDataView.buffer.slice(arrayOffset, arrayOffset + renderCommandSize));
let renderCommand = readStructAtAddress(arrayOffset, renderCommandDefinition);
let parentElement = scissorStack[scissorStack.length - 1];
let element = null;
let isMultiConfigElement = previousId === renderCommand.id.value;
if (!elementCache[renderCommand.id.value]) {
let elementType = 'div';
switch (renderCommand.commandType.value & 0xff) {
case CLAY_RENDER_COMMAND_TYPE_RECTANGLE: {
// if (readStructAtAddress(renderCommand.renderData.rectangle.value, rectangleRenderDataDefinition).link.length.value > 0) { TODO reimplement links
// elementType = 'a';
// }
break;
}
case CLAY_RENDER_COMMAND_TYPE_IMAGE: {
elementType = 'img'; break;
}
default: break;
}
element = document.createElement(elementType);
element.id = renderCommand.id.value;
if (renderCommand.commandType.value === CLAY_RENDER_COMMAND_TYPE_SCISSOR_START) {
element.style.overflow = 'hidden';
}
elementCache[renderCommand.id.value] = {
exists: true,
element: element,
previousMemoryCommand: new Uint8Array(0),
previousMemoryConfig: new Uint8Array(0),
previousMemoryText: new Uint8Array(0)
};
}
let elementData = elementCache[renderCommand.id.value];
element = elementData.element;
if (!isMultiConfigElement && Array.prototype.indexOf.call(parentElement.element.children, element) !== parentElement.nextElementIndex) {
if (parentElement.nextElementIndex === 0) {
parentElement.element.insertAdjacentElement('afterbegin', element);
} else {
parentElement.element.childNodes[Math.min(parentElement.nextElementIndex - 1, parentElement.element.childNodes.length - 1)].insertAdjacentElement('afterend', element);
}
}
elementData.exists = true;
// Don't get me started. Cheaper to compare the render command memory than to update HTML elements
let dirty = MemoryIsDifferent(elementData.previousMemoryCommand, entireRenderCommandMemory, renderCommandSize) && !isMultiConfigElement;
if (!isMultiConfigElement) {
parentElement.nextElementIndex++;
}
previousId = renderCommand.id.value;
elementData.previousMemoryCommand = entireRenderCommandMemory;
let offsetX = scissorStack.length > 0 ? scissorStack[scissorStack.length - 1].nextAllocation.x : 0;
let offsetY = scissorStack.length > 0 ? scissorStack[scissorStack.length - 1].nextAllocation.y : 0;
if (dirty) {
element.style.transform = `translate(${Math.round(renderCommand.boundingBox.x.value - offsetX)}px, ${Math.round(renderCommand.boundingBox.y.value - offsetY)}px)`
element.style.width = Math.round(renderCommand.boundingBox.width.value) + 'px';
element.style.height = Math.round(renderCommand.boundingBox.height.value) + 'px';
}
// note: commandType is packed to uint8_t and has 3 garbage bytes of padding
switch(renderCommand.commandType.value & 0xff) {
case (CLAY_RENDER_COMMAND_TYPE_NONE): {
break;
}
case (CLAY_RENDER_COMMAND_TYPE_RECTANGLE): {
let config = renderCommand.renderData.rectangle;
let configMemory = JSON.stringify(config);
if (configMemory === elementData.previousMemoryConfig) {
break;
}
SetElementBackgroundColorAndRadius(element, config.cornerRadius, config.backgroundColor);
if (renderCommand.userData.value !== 0) {
let customData = readStructAtAddress(renderCommand.userData.value, customHTMLDataDefinition);
let linkContents = customData.link.length.value > 0 ? textDecoder.decode(new Uint8Array(memoryDataView.buffer.slice(customData.link.chars.value, customData.link.chars.value + customData.link.length.value))) : 0;
memoryDataView.setUint32(0, renderCommand.id.value, true);
if (linkContents.length > 0 && (window.mouseDownThisFrame || window.touchDown) && instance.exports.Clay_PointerOver(0)) {
window.location.href = linkContents;
}
if (linkContents.length > 0) {
element.href = linkContents;
}
if (linkContents.length > 0 || customData.cursorPointer.value) {
element.style.pointerEvents = 'all';
element.style.cursor = 'pointer';
}
}
elementData.previousMemoryConfig = configMemory;
break;
}
case (CLAY_RENDER_COMMAND_TYPE_BORDER): {
let config = renderCommand.renderData.border;
let configMemory = JSON.stringify(config);
if (configMemory === elementData.previousMemoryConfig) {
break;
}
let color = config.color;
elementData.previousMemoryConfig = configMemory;
if (config.width.left.value > 0) {
element.style.borderLeft = `${config.width.left.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.width.right.value > 0) {
element.style.borderRight = `${config.width.right.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.width.top.value > 0) {
element.style.borderTop = `${config.width.top.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.width.bottom.value > 0) {
element.style.borderBottom = `${config.width.bottom.value}px solid rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`
}
if (config.cornerRadius.topLeft.value > 0) {
element.style.borderTopLeftRadius = config.cornerRadius.topLeft.value + 'px';
}
if (config.cornerRadius.topRight.value > 0) {
element.style.borderTopRightRadius = config.cornerRadius.topRight.value + 'px';
}
if (config.cornerRadius.bottomLeft.value > 0) {
element.style.borderBottomLeftRadius = config.cornerRadius.bottomLeft.value + 'px';
}
if (config.cornerRadius.bottomRight.value > 0) {
element.style.borderBottomRightRadius = config.cornerRadius.bottomRight.value + 'px';
}
break;
}
case (CLAY_RENDER_COMMAND_TYPE_TEXT): {
let config = renderCommand.renderData.text;
let customData = readStructAtAddress(renderCommand.userData.value, customHTMLDataDefinition);
let configMemory = JSON.stringify(config);
let stringContents = new Uint8Array(memoryDataView.buffer.slice(config.stringContents.chars.value, config.stringContents.chars.value + config.stringContents.length.value));
if (configMemory !== elementData.previousMemoryConfig) {
element.className = 'text';
let textColor = config.textColor;
let fontSize = Math.round(config.fontSize.value * GLOBAL_FONT_SCALING_FACTOR);
element.style.color = `rgba(${textColor.r.value}, ${textColor.g.value}, ${textColor.b.value}, ${textColor.a.value})`;
element.style.fontFamily = fontsById[config.fontId.value];
element.style.fontSize = fontSize + 'px';
element.style.pointerEvents = customData.disablePointerEvents.value ? 'none' : 'all';
elementData.previousMemoryConfig = configMemory;
}
if (stringContents.length !== elementData.previousMemoryText.length || MemoryIsDifferent(stringContents, elementData.previousMemoryText, stringContents.length)) {
element.innerHTML = textDecoder.decode(stringContents);
}
elementData.previousMemoryText = stringContents;
break;
}
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_START): {
scissorStack.push({ nextAllocation: { x: renderCommand.boundingBox.x.value, y: renderCommand.boundingBox.y.value }, element, nextElementIndex: 0 });
let config = renderCommand.renderData.scroll;
let configMemory = JSON.stringify(config);
if (configMemory === elementData.previousMemoryConfig) {
break;
}
if (config.horizontal.value) {
element.style.overflowX = 'scroll';
element.style.pointerEvents = 'auto';
}
if (config.vertical.value) {
element.style.overflowY = 'scroll';
element.style.pointerEvents = 'auto';
}
elementData.previousMemoryConfig = configMemory;
break;
}
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_END): {
scissorStack.splice(scissorStack.length - 1, 1);
break;
}
case (CLAY_RENDER_COMMAND_TYPE_IMAGE): {
let config = renderCommand.renderData.image;
let imageURL = readStructAtAddress(config.imageData.value, stringDefinition);
let srcContents = new Uint8Array(memoryDataView.buffer.slice(imageURL.chars.value, imageURL.chars.value + imageURL.length.value));
if (srcContents.length !== elementData.previousMemoryText.length || MemoryIsDifferent(srcContents, elementData.previousMemoryText, srcContents.length)) {
element.src = textDecoder.decode(srcContents);
}
elementData.previousMemoryText = srcContents;
break;
}
case (CLAY_RENDER_COMMAND_TYPE_CUSTOM): break;
default: {
console.log("Error: unhandled render command");
}
}
}
for (const key of Object.keys(elementCache)) {
if (elementCache[key].exists) {
elementCache[key].exists = false;
} else {
elementCache[key].element.remove();
delete elementCache[key];
}
}
}
function renderLoopCanvas() {
// Note: Rendering to canvas needs to be scaled up by window.devicePixelRatio in both width and height.
// e.g. if we're working on a device where devicePixelRatio is 2, we need to render
// everything at width^2 x height^2 resolution, then scale back down with css to get the correct pixel density.
let capacity = memoryDataView.getUint32(scratchSpaceAddress, true);
let length = memoryDataView.getUint32(scratchSpaceAddress + 4, true);
let arrayOffset = memoryDataView.getUint32(scratchSpaceAddress + 8, true);
window.canvasRoot.width = window.innerWidth * window.devicePixelRatio;
window.canvasRoot.height = window.innerHeight * window.devicePixelRatio;
window.canvasRoot.style.width = window.innerWidth + 'px';
window.canvasRoot.style.height = window.innerHeight + 'px';
let ctx = window.canvasContext;
let scale = window.devicePixelRatio;
for (let i = 0; i < length; i++, arrayOffset += renderCommandSize) {
let renderCommand = readStructAtAddress(arrayOffset, renderCommandDefinition);
let boundingBox = renderCommand.boundingBox;
// note: commandType is packed to uint8_t and has 3 garbage bytes of padding
switch(renderCommand.commandType.value & 0xff) {
case (CLAY_RENDER_COMMAND_TYPE_NONE): {
break;
}
case (CLAY_RENDER_COMMAND_TYPE_RECTANGLE): {
let config = renderCommand.renderData.rectangle;
let color = config.backgroundColor;
ctx.beginPath();
window.canvasContext.fillStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
window.canvasContext.roundRect(
boundingBox.x.value * scale, // x
boundingBox.y.value * scale, // y
boundingBox.width.value * scale, // width
boundingBox.height.value * scale,
[config.cornerRadius.topLeft.value * scale, config.cornerRadius.topRight.value * scale, config.cornerRadius.bottomRight.value * scale, config.cornerRadius.bottomLeft.value * scale]) // height;
ctx.fill();
ctx.closePath();
// Handle link clicks
if (renderCommand.userData.value !== 0) {
let customData = readStructAtAddress(renderCommand.userData.value, customHTMLDataDefinition);
let linkContents = customData.link.length.value > 0 ? textDecoder.decode(new Uint8Array(memoryDataView.buffer.slice(customData.link.chars.value, customData.link.chars.value + customData.link.length.value))) : 0;
memoryDataView.setUint32(0, renderCommand.id.value, true);
if (linkContents.length > 0 && (window.mouseDownThisFrame || window.touchDown) && instance.exports.Clay_PointerOver(0)) {
window.location.href = linkContents;
}
}
break;
}
case (CLAY_RENDER_COMMAND_TYPE_BORDER): {
let config = renderCommand.renderData.border;
let color = config.color;
ctx.beginPath();
ctx.moveTo(boundingBox.x.value * scale, boundingBox.y.value * scale);
// Top Left Corner
if (config.cornerRadius.topLeft.value > 0) {
let lineWidth = config.width.top.value;
let halfLineWidth = lineWidth / 2;
ctx.moveTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.topLeft.value + halfLineWidth) * scale);
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.arcTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale, (boundingBox.x.value + config.cornerRadius.topLeft.value + halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale, config.cornerRadius.topLeft.value * scale);
ctx.stroke();
}
// Top border
if (config.width.top.value > 0) {
let lineWidth = config.width.top.value;
let halfLineWidth = lineWidth / 2;
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.moveTo((boundingBox.x.value + config.cornerRadius.topLeft.value + halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale);
ctx.lineTo((boundingBox.x.value + boundingBox.width.value - config.cornerRadius.topRight.value - halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale);
ctx.stroke();
}
// Top Right Corner
if (config.cornerRadius.topRight.value > 0) {
let lineWidth = config.width.top.value;
let halfLineWidth = lineWidth / 2;
ctx.moveTo((boundingBox.x.value + boundingBox.width.value - config.cornerRadius.topRight.value - halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale);
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.arcTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + halfLineWidth) * scale, (boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.topRight.value + halfLineWidth) * scale, config.cornerRadius.topRight.value * scale);
ctx.stroke();
}
// Right border
if (config.width.right.value > 0) {
let lineWidth = config.width.right.value;
let halfLineWidth = lineWidth / 2;
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.moveTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.topRight.value + halfLineWidth) * scale);
ctx.lineTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.topRight.value - halfLineWidth) * scale);
ctx.stroke();
}
// Bottom Right Corner
if (config.cornerRadius.bottomRight.value > 0) {
let lineWidth = config.width.top.value;
let halfLineWidth = lineWidth / 2;
ctx.moveTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.bottomRight.value - halfLineWidth) * scale);
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.arcTo((boundingBox.x.value + boundingBox.width.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale, (boundingBox.x.value + boundingBox.width.value - config.cornerRadius.bottomRight.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale, config.cornerRadius.bottomRight.value * scale);
ctx.stroke();
}
// Bottom Border
if (config.width.bottom.value > 0) {
let lineWidth = config.width.bottom.value;
let halfLineWidth = lineWidth / 2;
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.moveTo((boundingBox.x.value + config.cornerRadius.bottomLeft.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale);
ctx.lineTo((boundingBox.x.value + boundingBox.width.value - config.cornerRadius.bottomRight.value - halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale);
ctx.stroke();
}
// Bottom Left Corner
if (config.cornerRadius.bottomLeft.value > 0) {
let lineWidth = config.width.bottom.value;
let halfLineWidth = lineWidth / 2;
ctx.moveTo((boundingBox.x.value + config.cornerRadius.bottomLeft.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale);
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.arcTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - halfLineWidth) * scale, (boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.bottomLeft.value - halfLineWidth) * scale, config.cornerRadius.bottomLeft.value * scale);
ctx.stroke();
}
// Left Border
if (config.width.left.value > 0) {
let lineWidth = config.width.left.value;
let halfLineWidth = lineWidth / 2;
ctx.lineWidth = lineWidth * scale;
ctx.strokeStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.moveTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + boundingBox.height.value - config.cornerRadius.bottomLeft.value - halfLineWidth) * scale);
ctx.lineTo((boundingBox.x.value + halfLineWidth) * scale, (boundingBox.y.value + config.cornerRadius.bottomRight.value + halfLineWidth) * scale);
ctx.stroke();
}
ctx.closePath();
break;
}
case (CLAY_RENDER_COMMAND_TYPE_TEXT): {
let config = renderCommand.renderData.text;
let textContents = config.stringContents;
let stringContents = new Uint8Array(memoryDataView.buffer.slice(textContents.chars.value, textContents.chars.value + textContents.length.value));
let fontSize = config.fontSize.value * GLOBAL_FONT_SCALING_FACTOR * scale;
ctx.font = `${fontSize}px ${fontsById[config.fontId.value]}`;
let color = config.textColor;
ctx.textBaseline = 'middle';
ctx.fillStyle = `rgba(${color.r.value}, ${color.g.value}, ${color.b.value}, ${color.a.value / 255})`;
ctx.fillText(textDecoder.decode(stringContents), boundingBox.x.value * scale, (boundingBox.y.value + boundingBox.height.value / 2 + 1) * scale);
break;
}
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_START): {
window.canvasContext.save();
window.canvasContext.beginPath();
window.canvasContext.rect(boundingBox.x.value * scale, boundingBox.y.value * scale, boundingBox.width.value * scale, boundingBox.height.value * scale);
window.canvasContext.clip();
window.canvasContext.closePath();
break;
}
case (CLAY_RENDER_COMMAND_TYPE_SCISSOR_END): {
window.canvasContext.restore();
break;
}
case (CLAY_RENDER_COMMAND_TYPE_IMAGE): {
let config = renderCommand.renderData.image;
let imageURL = readStructAtAddress(config.imageData.value, stringDefinition);
let src = textDecoder.decode(new Uint8Array(memoryDataView.buffer.slice(imageURL.chars.value, imageURL.chars.value + imageURL.length.value)));
if (!imageCache[src]) {
imageCache[src] = {
image: new Image(),
loaded: false,
}
imageCache[src].image.onload = () => imageCache[src].loaded = true;
imageCache[src].image.src = src;
} else if (imageCache[src].loaded) {
ctx.drawImage(imageCache[src].image, boundingBox.x.value * scale, boundingBox.y.value * scale, boundingBox.width.value * scale, boundingBox.height.value * scale);
}
break;
}
case (CLAY_RENDER_COMMAND_TYPE_CUSTOM): break;
}
}
}
function renderLoop(currentTime) {
const elapsed = currentTime - previousFrameTime;
previousFrameTime = currentTime;
let activeRendererIndex = memoryDataView.getUint32(instance.exports.ACTIVE_RENDERER_INDEX.value, true);
if (activeRendererIndex === 0) {
instance.exports.UpdateDrawFrame(scratchSpaceAddress, window.innerWidth, window.innerHeight, 0, 0, window.mousePositionXThisFrame, window.mousePositionYThisFrame, window.touchDown, window.mouseDown, 0, 0, window.dKeyPressedThisFrame, elapsed / 1000);
} else {
instance.exports.UpdateDrawFrame(scratchSpaceAddress, window.innerWidth, window.innerHeight, window.mouseWheelXThisFrame, window.mouseWheelYThisFrame, window.mousePositionXThisFrame, window.mousePositionYThisFrame, window.touchDown, window.mouseDown, window.arrowKeyDownPressedThisFrame, window.arrowKeyUpPressedThisFrame, window.dKeyPressedThisFrame, elapsed / 1000);
}
let rendererChanged = activeRendererIndex !== window.previousActiveRendererIndex;
switch (activeRendererIndex) {
case 0: {
renderLoopHTML();
if (rendererChanged) {
window.htmlRoot.style.display = 'block';
window.canvasRoot.style.display = 'none';
}
break;
}
case 1: {
renderLoopCanvas();
if (rendererChanged) {
window.htmlRoot.style.display = 'none';
window.canvasRoot.style.display = 'block';
}
break;
}
}
window.previousActiveRendererIndex = activeRendererIndex;
requestAnimationFrame(renderLoop);
window.mouseDownThisFrame = false;
window.arrowKeyUpPressedThisFrame = false;
window.arrowKeyDownPressedThisFrame = false;
window.dKeyPressedThisFrame = false;
}
init();
</script>
<body>
</body>
</html>