From bf789eb2fdc985b7e0ed1a1b97f14a649b4d6ea9 Mon Sep 17 00:00:00 2001
From: Will Scullin <scullin@scullin.com>
Date: Sat, 23 Jul 2022 15:51:12 -0700
Subject: [PATCH] Add hires preview (#146)

---
 js/canvas.ts                                  | 14 +++---
 js/components/debugger/FileViewer.tsx         | 43 ++++++++++++++++---
 .../debugger/css/FileViewer.module.css        | 22 +++++++++-
 3 files changed, 65 insertions(+), 14 deletions(-)

diff --git a/js/canvas.ts b/js/canvas.ts
index 8fae70f..18eb7f9 100644
--- a/js/canvas.ts
+++ b/js/canvas.ts
@@ -113,7 +113,7 @@ export class LoresPage2D implements LoresPage {
 
     private highColorTextMode = false;
 
-    dirty: Region = {...notDirty};
+    dirty: Region = { ...notDirty };
     imageData: ImageData;
 
     constructor(
@@ -485,7 +485,7 @@ export class LoresPage2D implements LoresPage {
 
 export class HiresPage2D implements HiresPage {
     public imageData: ImageData;
-    dirty: Region = {...notDirty};
+    dirty: Region = { ...notDirty };
 
     private _buffer: memory[] = [];
     private _refreshing = false;
@@ -604,7 +604,7 @@ export class HiresPage2D implements HiresPage {
             if (x > this.dirty.right) { this.dirty.right = x; }
 
             dy = rowa << 4 | rowb << 1;
-            let bz, b0, b1, b2, b3, b4, c, hb;
+            let bz, b0, b1, b2, b3, b4, c;
             if (this.oneSixtyMode && !this.vm.monoMode) {
                 // 1 byte = two pixels, but 3:4 ratio
                 const c3 = val & 0xf;
@@ -643,8 +643,8 @@ export class HiresPage2D implements HiresPage {
                     ((b2 & 0x40) >> 6) | ((b3 & 0x07) << 1), // 5
                     ((b3 & 0x78) >> 3), // 6
                     0
-                ], // 7
-                hb = [
+                ]; // 7
+                const hb = [
                     0,
                     b0 & 0x80, // 0
                     b0 & 0x80, // 1
@@ -1092,8 +1092,8 @@ export class VideoModes2D implements VideoModes {
                 gr.imageData, gr.dirty
             );
         }
-        hgr.dirty = {...notDirty};
-        gr.dirty = {...notDirty};
+        hgr.dirty = { ...notDirty };
+        gr.dirty = { ...notDirty };
 
         return blitted;
     }
diff --git a/js/components/debugger/FileViewer.tsx b/js/components/debugger/FileViewer.tsx
index 86470a3..3318b59 100644
--- a/js/components/debugger/FileViewer.tsx
+++ b/js/components/debugger/FileViewer.tsx
@@ -1,5 +1,6 @@
+import { HiresPage2D, LoresPage2D, VideoModes2D } from 'js/canvas';
 import { h, Fragment } from 'preact';
-import { useEffect, useState } from 'preact/hooks';
+import { useEffect, useRef, useState } from 'preact/hooks';
 import { Modal, ModalContent, ModalFooter } from '../Modal';
 
 import styles from './css/FileViewer.module.css';
@@ -15,6 +16,35 @@ export interface FileViewerProps {
     onClose: () => void;
 }
 
+const HiresPreview = ({ binary }: { binary: Uint8Array }) => {
+    const canvasRef = useRef<HTMLCanvasElement>(null);
+    if (binary.byteLength < 8187 || binary.byteLength > 8192) {
+        return null;
+    }
+
+    if (canvasRef.current) {
+        const vm = new VideoModes2D(canvasRef.current, true);
+        const lores = new LoresPage2D(vm, 1, new Uint8Array(), false);
+        const hires = new HiresPage2D(vm, 1);
+        vm.setLoresPage(1, lores);
+        vm.setHiresPage(1, hires);
+        vm.text(false);
+        vm.hires(true);
+        vm.doubleHires(false);
+        vm.page(1);
+
+        for (let idx = 0; idx < 0x20; idx++) {
+            for (let jdx = 0; jdx < 0x100; jdx++) {
+                hires.write(idx + 0x20, jdx, binary[idx * 0x100 + jdx]);
+            }
+        }
+        vm.blit();
+    }
+
+    return <canvas ref={canvasRef} width={560} height={192} className={styles.hiresPreview} />;
+};
+
+
 export const FileViewer = ({ fileData, onClose }: FileViewerProps) => {
     const [binaryHref, setBinaryHref] = useState('');
     const [textHref, setTextHref] = useState('');
@@ -41,15 +71,18 @@ export const FileViewer = ({ fileData, onClose }: FileViewerProps) => {
         return null;
     }
 
-    const { fileName, text } = fileData;
+    const { fileName, text, binary } = fileData;
 
     return (
         <>
             <Modal isOpen={true} onClose={onClose} title={fileName}>
                 <ModalContent>
-                    <pre className={styles.fileViewer} tabIndex={-1} >
-                        {text}
-                    </pre>
+                    <div className={styles.fileViewer}>
+                        <HiresPreview binary={binary} />
+                        <pre className={styles.textViewer} tabIndex={-1} >
+                            {text}
+                        </pre>
+                    </div>
                 </ModalContent>
                 <ModalFooter>
                     <a
diff --git a/js/components/debugger/css/FileViewer.module.css b/js/components/debugger/css/FileViewer.module.css
index 3adebf3..ff335f4 100644
--- a/js/components/debugger/css/FileViewer.module.css
+++ b/js/components/debugger/css/FileViewer.module.css
@@ -1,10 +1,28 @@
 .fileViewer {
-    background: white;
-    font: monospace;
     width: 60em;
+    max-height: 60vh;
+    overflow-y: auto;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+}
+
+.textViewer {
+    background: white;
+    font-family: monospace;
+    width: 57em;
     padding: 1em;
     height: 60vh;
+    line-height: 1em;
     overflow-y: auto;
     border: 2px inset #f0edd0;
     white-space: pre-wrap;
 }
+
+.hiresPreview {
+    border: 2px inset #f0edd0;
+    width: 560px;
+    height: 384px;
+    min-width: 560px;
+    min-height: 384px;
+}