From 127ca791da5d21c59cdb2f4f9d6ee12ffb444953 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Mon, 26 Jul 2021 00:47:35 -0400
Subject: [PATCH] add thumb/preview decoding

---
 src/add/class.js        |  6 +++++
 src/mode/sla/x_cxdlp.js |  9 ++++---
 web/kiri/cxdlp.html     | 54 ++++++++++++++++++++++++++++++++++-------
 3 files changed, 57 insertions(+), 12 deletions(-)

diff --git a/src/add/class.js b/src/add/class.js
index 0b86a52a..f9f099fe 100644
--- a/src/add/class.js
+++ b/src/add/class.js
@@ -106,6 +106,12 @@ self.DataReader = class DataReader {
         return p;
     }
 
+    readBytes(len) {
+        let buf = this.view.buffer.slice(this.pos, this.pos + len);
+        this.pos += len;
+        return buf;
+    }
+
     readU8() {
         return this.view.getUint8(this.pos++);
     }
diff --git a/src/mode/sla/x_cxdlp.js b/src/mode/sla/x_cxdlp.js
index 4659ceb7..fcf542f1 100644
--- a/src/mode/sla/x_cxdlp.js
+++ b/src/mode/sla/x_cxdlp.js
@@ -64,9 +64,12 @@
                 res_y: read.readU16(),
                 height: read.readU32(),
                 skip: read.skip(60),
-                thumb: read.skip(26914),
-                preview1: read.skip(168202),
-                preview2: read.skip(168202),
+                thumb: read.readBytes(26912),
+                skip: read.skip(2), // 0xd0a term
+                preview1: read.readBytes(168200),
+                skip: read.skip(2), // 0xd0a term
+                preview2: read.readBytes(168200),
+                skip: read.skip(2), // 0xd0a term
                 dim_x: read_string(true),
                 dim_y: read_string(true),
                 layer: read_string(true),
diff --git a/web/kiri/cxdlp.html b/web/kiri/cxdlp.html
index 0e5dd1f9..42792e6b 100644
--- a/web/kiri/cxdlp.html
+++ b/web/kiri/cxdlp.html
@@ -8,13 +8,24 @@
         div {
             display: flex;
             flex-direction: row;
+            justify-content: flex-start;
+            align-items: flex-start;
         }
         th {
             text-align: left;
         }
+        canvas, #params, #ctrl {
+            margin: 1px;
+            padding: 3px;
+            border: 1px solid black;
+            border-radius: 3px;
+        }
         #slider {
             flex-grow: 1;
         }
+        #params {
+            flex-grow: 1;
+        }
         .over {
             background-color: rgba(0,255,0,0.1);
         }
@@ -58,16 +69,41 @@
         function row(key,value) {
             return `<tr><th>${key}</th><td>${value}</td></tr>`;
         }
+        function rev(value, bits = 8) {
+            let out = 0
+            for (let i=0; i<bits; i++) {
+                out |= (value >> i & 1) << bits-1-i
+            }
+            return out >>> 0;
+        }
+        function decode(canvas, image, size) {
+            let tile = new Uint8Array(image);
+            let draw = canvas.getContext('2d');
+            let data = draw.getImageData(0,0,size,size);
+            let rawd = data.data;
+            for (let x=0; x<size; x++) {
+                for (let y=0; y<size; y++) {
+                    let ind = (x * size + y) * 2;
+                    let rgb = (tile[ind] << 8) | (tile[ind+1] << 0);
+                    let pos = (y * size + x) * 4;
+                    rawd[pos+0] = ((rgb >> 11) << 3) & 0xff;
+                    rawd[pos+1] = ((rgb >>  5) << 2) & 0xff;
+                    rawd[pos+2] = ((rgb >>  0) << 3) & 0xff;
+                    rawd[pos+3] = 255;
+                }
+            }
+            draw.putImageData(data, 0, 0);
+        }
         function meta(cxdlp) {
             let rows = Object.entries(cxdlp).filter(e => {
                 let t = typeof(e[1]);
                 return t === 'number' || t === 'string';
             }).map(e => row(e[0], e[1]));
-            params.innerHTML = [
-                '<table>',
-                ...rows,
-                '</table>'
-            ].join('');
+            params.innerHTML = [ '<table>', ...rows, '</table>' ].join('');
+            console.log({cxdlp});
+            decode(thumb, cxdlp.thumb, 116);
+            decode(pre1, cxdlp.preview1, 290);
+            decode(pre2, cxdlp.preview2, 290);
         }
         function render(layer) {
             let cxdlp = window.cxdlp;
@@ -94,7 +130,7 @@
     </script>
 </head>
 <body>
-    <div>
+    <div id="ctrl">
         <input id="layer" size=5>
         <input id="slider" type="range" min=0 max=100 value=0>
         <input id="layers" size=5 disabled=true>
@@ -102,9 +138,9 @@
     <canvas id="canvas" width=4000 height=2000></canvas>
     <div>
         <div id="params"></div>
-        <canvas id="thumb"></canvas>
-        <canvas id="pre1"></canvas>
-        <canvas id="pre2"></canvas>
+        <canvas id="pre1" width=290 height=290></canvas>
+        <canvas id="pre2" width=290 height=290></canvas>
+        <canvas id="thumb" width=116 height=116></canvas>
     </div>
 </body>
 </html>