From f6fe41af96356ffe65b8c2efa24c4bafb8cb1fae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Elena=20Torr=C3=B3?= <elenatorro@gmail.com>
Date: Fri, 30 May 2025 12:10:34 +0200
Subject: [PATCH] :wrench: Add texts playground (#6599)

---
 frontend/resources/wasm-playground/js/lib.js  |  85 +++++++++++++-
 frontend/resources/wasm-playground/paths.html |   4 +-
 frontend/resources/wasm-playground/plus.html  |   4 +-
 frontend/resources/wasm-playground/rects.html |   4 +-
 frontend/resources/wasm-playground/texts.html | 105 ++++++++++++++++++
 5 files changed, 195 insertions(+), 7 deletions(-)
 create mode 100644 frontend/resources/wasm-playground/texts.html

diff --git a/frontend/resources/wasm-playground/js/lib.js b/frontend/resources/wasm-playground/js/lib.js
index 4aefe6701..b4bd846a6 100644
--- a/frontend/resources/wasm-playground/js/lib.js
+++ b/frontend/resources/wasm-playground/js/lib.js
@@ -92,7 +92,7 @@ export function addShapeSolidFill(argb) {
   Module._add_shape_fill();
 }
 
-export function addShapeSolidStroleFill(argb) {
+export function addShapeSolidStrokeFill(argb) {
   const ptr = allocBytes(160);
   const heap = getHeapU32();
   const dv = new DataView(heap.buffer);
@@ -230,3 +230,86 @@ export function setupInteraction(canvas) {
   canvas.addEventListener("mouseup", () => { isPanning = false; });
   canvas.addEventListener("mouseout", () => { isPanning = false; });
 }
+
+export function addTextShape(x, y, fontSize, text) {
+  const numLeaves = 1; // Single text leaf for simplicity
+  const paragraphAttrSize = 48;
+  const leafAttrSize = 56;
+  const fillSize = 160;
+  const textBuffer = new TextEncoder().encode(text);
+  const textSize = textBuffer.byteLength;
+
+  // Calculate fills
+  const fills = [
+    {
+      type: "solid",
+      color: getRandomColor(),
+      opacity: getRandomFloat(0.5, 1.0),
+    },
+  ];
+  const totalFills = fills.length;
+  const totalFillsSize = totalFills * fillSize;
+
+  // Calculate metadata and total buffer size
+  const metadataSize = paragraphAttrSize + leafAttrSize + totalFillsSize;
+  const totalSize = metadataSize + textSize;
+
+  // Allocate buffer
+  const bufferPtr = allocBytes(totalSize);
+  const heap = new Uint8Array(Module.HEAPU8.buffer, bufferPtr, totalSize);
+  const dview = new DataView(heap.buffer, bufferPtr, totalSize);
+
+  // Set number of leaves
+  dview.setUint32(0, numLeaves, true);
+
+  // Serialize paragraph attributes
+  dview.setUint8(4, 1); // text-align: left
+  dview.setUint8(5, 0); // text-direction: LTR
+  dview.setUint8(6, 0); // text-decoration: none
+  dview.setUint8(7, 0); // text-transform: none
+  dview.setFloat32(8, 1.2, true); // line-height
+  dview.setFloat32(12, 0, true); // letter-spacing
+  dview.setUint32(16, 0, true); // typography-ref-file (UUID part 1)
+  dview.setUint32(20, 0, true); // typography-ref-file (UUID part 2)
+  dview.setUint32(24, 0, true); // typography-ref-file (UUID part 3)
+  dview.setInt32(28, 0, true); // typography-ref-file (UUID part 4)
+  dview.setUint32(32, 0, true); // typography-ref-id (UUID part 1)
+  dview.setUint32(36, 0, true); // typography-ref-id (UUID part 2)
+  dview.setUint32(40, 0, true); // typography-ref-id (UUID part 3)
+  dview.setInt32(44, 0, true); // typography-ref-id (UUID part 4)
+
+  // Serialize leaf attributes
+  const leafOffset = paragraphAttrSize;
+  dview.setUint8(leafOffset, 0); // font-style: normal
+  dview.setFloat32(leafOffset + 4, fontSize, true); // font-size
+  dview.setUint32(leafOffset + 8, 400, true); // font-weight: normal
+  dview.setUint32(leafOffset + 12, 0, true); // font-id (UUID part 1)
+  dview.setUint32(leafOffset + 16, 0, true); // font-id (UUID part 2)
+  dview.setUint32(leafOffset + 20, 0, true); // font-id (UUID part 3)
+  dview.setInt32(leafOffset + 24, 0, true); // font-id (UUID part 4)
+  dview.setInt32(leafOffset + 28, 0, true); // font-family hash
+  dview.setUint32(leafOffset + 32, 0, true); // font-variant-id (UUID part 1)
+  dview.setUint32(leafOffset + 36, 0, true); // font-variant-id (UUID part 2)
+  dview.setUint32(leafOffset + 40, 0, true); // font-variant-id (UUID part 3)
+  dview.setInt32(leafOffset + 44, 0, true); // font-variant-id (UUID part 4)
+  dview.setInt32(leafOffset + 48, textSize, true); // text-length
+  dview.setInt32(leafOffset + 52, totalFills, true); // total fills count
+
+  // Serialize fills
+  let fillOffset = leafOffset + leafAttrSize;
+  fills.forEach((fill) => {
+    if (fill.type === "solid") {
+      const argb = hexToU32ARGB(fill.color, fill.opacity);
+      dview.setUint8(fillOffset, 0x00, true); // Fill type: solid
+      dview.setUint32(fillOffset + 4, argb, true);
+      fillOffset += fillSize; // Move to the next fill
+    }
+  });
+
+  // Add text content
+  const textOffset = metadataSize;
+  heap.set(textBuffer, textOffset);
+
+  // Call the WebAssembly function
+  Module._set_shape_text_content();
+}
\ No newline at end of file
diff --git a/frontend/resources/wasm-playground/paths.html b/frontend/resources/wasm-playground/paths.html
index ee4cc0ea2..ecc56af20 100644
--- a/frontend/resources/wasm-playground/paths.html
+++ b/frontend/resources/wasm-playground/paths.html
@@ -27,7 +27,7 @@
     import {
       init, addShapeSolidFill, assignCanvas, hexToU32ARGB, getRandomInt, getRandomColor,
       getRandomFloat, useShape, setShapeChildren, setupInteraction, set_parent, draw_star,
-      addShapeSolidStroleFill
+      addShapeSolidStrokeFill
     } from './js/lib.js';
 
     const canvas = document.getElementById("canvas");
@@ -66,7 +66,7 @@
 
         Module._add_shape_center_stroke(10, 0,  0, 0);
         const argb2 = hexToU32ARGB(color, getRandomFloat(0.1, 1.0));
-        addShapeSolidStroleFill(argb2);
+        addShapeSolidStrokeFill(argb2);
 
       }
 
diff --git a/frontend/resources/wasm-playground/plus.html b/frontend/resources/wasm-playground/plus.html
index 9ed6734bf..cd63ae677 100644
--- a/frontend/resources/wasm-playground/plus.html
+++ b/frontend/resources/wasm-playground/plus.html
@@ -27,7 +27,7 @@
     import {
       init, addShapeSolidFill, assignCanvas, hexToU32ARGB, getRandomInt, getRandomColor,
       getRandomFloat, useShape, setShapeChildren, setupInteraction, set_parent, allocBytes,
-      addShapeSolidStroleFill, getHeapU32
+      addShapeSolidStrokeFill, getHeapU32
     } from './js/lib.js';
 
     const canvas = document.getElementById("canvas");
@@ -90,7 +90,7 @@
         const color = getRandomColor();
         Module._add_shape_center_stroke(10, 0,  0, 0);
         const argb2 = hexToU32ARGB(color, getRandomFloat(0.1, 1.0));
-        addShapeSolidStroleFill(argb2);
+        addShapeSolidStrokeFill(argb2);
 
       }
 
diff --git a/frontend/resources/wasm-playground/rects.html b/frontend/resources/wasm-playground/rects.html
index 2d6e40e7c..bb05ecbda 100644
--- a/frontend/resources/wasm-playground/rects.html
+++ b/frontend/resources/wasm-playground/rects.html
@@ -26,7 +26,7 @@
     import initWasmModule from '/js/render_wasm.js';
     import {
       init, addShapeSolidFill, assignCanvas, hexToU32ARGB, getRandomInt, getRandomColor,
-      getRandomFloat, useShape, setShapeChildren, setupInteraction, addShapeSolidStroleFill
+      getRandomFloat, useShape, setShapeChildren, setupInteraction, addShapeSolidStrokeFill
     } from './js/lib.js';
 
     const canvas = document.getElementById("canvas");
@@ -64,7 +64,7 @@
 
         Module._add_shape_center_stroke(10, 0,  0, 0);
         const argb2 = hexToU32ARGB(color, getRandomFloat(0.1, 1.0));
-        addShapeSolidStroleFill(argb2);        
+        addShapeSolidStrokeFill(argb2);        
       }
 
       useShape("00000000-0000-0000-0000-000000000000");
diff --git a/frontend/resources/wasm-playground/texts.html b/frontend/resources/wasm-playground/texts.html
new file mode 100644
index 000000000..9dfacbc5d
--- /dev/null
+++ b/frontend/resources/wasm-playground/texts.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<html lang="es">
+<head>
+  <meta charset="UTF-8" />
+  <title>WASM + WebGL2 Texts</title>
+  <style>
+    body {
+      margin: 0;
+      background: #111;
+      display: flex;
+      justify-content: center;
+      align-items: center;
+      height: 100vh;
+      overflow: hidden;
+    }
+    canvas {
+      width: 100%;
+      height: 100%;
+      position: absolute;
+    }
+  </style>
+</head>
+<body>
+  <canvas id="canvas"></canvas>
+  <script type="module">
+    import initWasmModule from '/js/render_wasm.js';
+    import {
+      init, assignCanvas, setupInteraction, useShape, setShapeChildren, addTextShape, hexToU32ARGB,getRandomInt, getRandomColor, getRandomFloat, addShapeSolidFill, addShapeSolidStrokeFill
+    } from './js/lib.js';
+
+    const canvas = document.getElementById("canvas");
+    canvas.width = window.innerWidth;
+    canvas.height = window.innerHeight;
+    const MIN_LINES = 1;
+    const MAX_LINES = 5;
+    const MIN_WORDS = 1;
+    const MAX_WORDS = 10;
+
+    const params = new URLSearchParams(document.location.search);
+    const texts = params.get("texts") || 100;
+
+    function getRandomText() {
+      const words = ["Hello", "World", "Penpot", "Canvas", "Text", "Shape", "Random", "Line"];
+      const lines = Math.floor(Math.random() * MAX_LINES) + MIN_LINES;
+      let text = "";
+      for (let i = 0; i < lines; i++) {
+        const lineLength = Math.floor(Math.random() * MAX_WORDS) + MIN_WORDS;
+        const line = Array.from({ length: lineLength }, () => words[Math.floor(Math.random() * words.length)]).join(" ");
+        text += line;
+        if (i < lines - 1) text += "\n";
+      }
+      return text;
+    }
+
+    initWasmModule().then(Module => {
+      init(Module);
+      assignCanvas(canvas);
+      Module._set_canvas_background(hexToU32ARGB("#FABADA", 1));
+      Module._set_view(1, 0, 0);
+      Module._init_shapes_pool(texts + 1);
+      setupInteraction(canvas);
+
+      const children = [];
+      for (let i = 0; i < texts; i++) {
+        const uuid = crypto.randomUUID();
+        children.push(uuid);
+
+        useShape(uuid);
+        Module._set_parent(0, 0, 0, 0);
+        Module._set_shape_type(5);
+
+        const x1 = getRandomInt(0, canvas.width);
+        const y1 = getRandomInt(0, canvas.height);
+        const width = getRandomInt(20, 500);
+        const height = getRandomInt(20, 100);
+        Module._set_shape_selrect(x1, y1, x1 + width, y1 + height);
+
+        if (Math.random() < 0.3) {
+          const numStrokes = getRandomInt(1, 3);
+          for (let j = 0; j < numStrokes; j++) {
+            const strokeWidth = getRandomInt(1, 10);
+            Module._add_shape_center_stroke(strokeWidth, 0, 0, 0);
+            const color = getRandomColor();
+            const argb2 = hexToU32ARGB(color, getRandomFloat(0.1, 1.0));
+            addShapeSolidStrokeFill(argb2);
+          }
+        }
+
+        const fontSize = Math.random() * 50 + 10;
+        const text = getRandomText();
+        addTextShape(x1, y1, fontSize, text);
+      }
+
+      useShape("00000000-0000-0000-0000-000000000000");
+      setShapeChildren(children);
+
+      performance.mark('render:begin');
+      Module._render(Date.now());
+      performance.mark('render:end');
+      const { duration } = performance.measure('render', 'render:begin', 'render:end');
+      console.log(`Render time: ${duration.toFixed(2)}ms`);
+    });
+  </script>
+</body>
+</html>
\ No newline at end of file