feat: implemented export and wasm rendering

frontend/src/lib/wasmLoader.ts

@@ -12,6 +12,7 @@ export interface WasmEngineInstance {
   freeDocument: (handle: number) => void;
   engineBuildInfo: () => string;
   engineHasSkia: () => boolean;
+  getTextJson: (handle: number, page: number) => string;
 }
 
 class WasmLoader {
@@ -85,6 +86,9 @@ class WasmLoader {
         },
         engineHasSkia: () => {
           return Module.ccall('engineHasSkia', 'number', [], []) !== 0;
+        },
+        getTextJson: (handle: number, page: number) => {
+          return Module.ccall('getPageTextJson', 'string', ['number', 'number'], [handle, page]);
         }
       };
       
@@ -131,6 +135,17 @@ class WasmLoader {
       },
       engineHasSkia: () => {
         return true;
+      },
+      getTextJson: (handle: number, page: number) => {
+        void handle;
+        return JSON.stringify([
+          { text: "P", x: 60.0, y: 80.0, w: 6.0, h: 8.0, fontSize: 12.0 },
+          { text: "a", x: 66.0, y: 80.0, w: 6.0, h: 8.0, fontSize: 12.0 },
+          { text: "g", x: 72.0, y: 80.0, w: 6.0, h: 8.0, fontSize: 12.0 },
+          { text: "e", x: 78.0, y: 80.0, w: 6.0, h: 8.0, fontSize: 12.0 },
+          { text: " ", x: 84.0, y: 80.0, w: 6.0, h: 8.0, fontSize: 12.0 },
+          { text: String(page + 1), x: 90.0, y: 80.0, w: 6.0, h: 8.0, fontSize: 12.0 }
+        ]);
       }
     };
   }