feat: get page size

Author: fundon

packages/pdf-viewer/__tests__/lorem-ipsum.spec.ts

@@ -36,11 +36,17 @@ test('pdf lorem ipsum', async () => {
   expect(page.width()).toBeCloseTo(595, 0.1);
   expect(page.height()).toBeCloseTo(842, 0.1);
 
+  expect(page.size()).toStrictEqual({
+    width: page.width(),
+    height: page.height(),
+  });
+
   page.close();
   expect(page.pointer).toBe(0);
 
   expect(page.width()).toBe(0);
   expect(page.height()).toBe(0);
+
   expect(page.rotation()).toBe(-1);
   expect(page.hasTransparency()).toBe(false);
 
@@ -49,6 +55,12 @@ test('pdf lorem ipsum', async () => {
 
   expect(page.width()).toBeCloseTo(595, 0.1);
   expect(page.height()).toBeCloseTo(842, 0.1);
+
+  expect(page.size()).toStrictEqual({
+    width: page.width(),
+    height: page.height(),
+  });
+
   expect(page.rotation()).toBe(0);
   expect(page.hasTransparency()).toBe(false);
 

packages/pdf-viewer/__tests__/minimal.spec.ts

@@ -36,11 +36,17 @@ test('pdf minimal', async () => {
   expect(page.width()).toBeCloseTo(595, 0.1);
   expect(page.height()).toBeCloseTo(842, 0.1);
 
+  expect(page.size()).toStrictEqual({
+    width: page.width(),
+    height: page.height(),
+  });
+
   page.close();
   expect(page.pointer).toBe(0);
 
   expect(page.width()).toBe(0);
   expect(page.height()).toBe(0);
+
   expect(page.rotation()).toBe(-1);
   expect(page.hasTransparency()).toBe(false);
 
@@ -49,6 +55,12 @@ test('pdf minimal', async () => {
 
   expect(page.width()).toBeCloseTo(595, 0.1);
   expect(page.height()).toBeCloseTo(842, 0.1);
+
+  expect(page.size()).toStrictEqual({
+    width: page.width(),
+    height: page.height(),
+  });
+
   expect(page.rotation()).toBe(0);
   expect(page.hasTransparency()).toBe(false);
 

packages/pdf-viewer/src/document.ts

@@ -1,4 +1,8 @@
-import type { FileIdentifier, MetaTag, Metadata } from '@toeverything/pdf-viewer-types';
+import type {
+  FileIdentifier,
+  MetaTag,
+  Metadata,
+} from '@toeverything/pdf-viewer-types';
 import { MetaTags } from '@toeverything/pdf-viewer-types';
 
 import type { Runtime } from './runtime.js';

packages/pdf-viewer/src/page.ts

@@ -2,6 +2,9 @@ import type { Bitmap } from './bitmap.js';
 import type { Document } from './document.js';
 
 export class Page {
+  #width = 0;
+  #height = 0;
+
   constructor(
     public doc: Document,
     public index: number,
@@ -31,6 +34,9 @@ export class Page {
     if (!this.ptr) return;
     this.runtime.closePage(this.ptr);
     this.ptr = 0;
+
+    this.#width = 0;
+    this.#height = 0;
   }
 
   label() {
@@ -57,11 +63,17 @@ export class Page {
   }
 
   width() {
-    return this.runtime.pageWidth(this.ptr);
+    if (!this.#width) {
+      this.#width = this.runtime.pageWidth(this.ptr);
+    }
+    return this.#width;
   }
 
   height() {
-    return this.runtime.pageHeight(this.ptr);
+    if (!this.#height) {
+      this.#height = this.runtime.pageHeight(this.ptr);
+    }
+    return this.#height;
   }
 
   rotation() {
@@ -72,8 +84,24 @@ export class Page {
     return !!this.runtime.pageTransparency(this.ptr);
   }
 
+  size() {
+    if (!this.#width || !this.#height) {
+      const sizePtr = this.runtime.malloc(8);
+
+      this.runtime.pageSize(this.doc.pointer, this.index, sizePtr);
+
+      this.#width = this.runtime.getValue(sizePtr, 'float');
+      this.#height = this.runtime.getValue(sizePtr + 4, 'float');
+
+      this.runtime.free(sizePtr);
+    }
+
+    return { width: this.#width, height: this.#height };
+  }
+
   rect() {
-    return { bottom: 0, left: 0, top: this.height(), right: this.width() };
+    const { width: right, height: top } = this.size();
+    return { bottom: 0, left: 0, top, right };
   }
 
   render(

packages/pdf-viewer/src/runtime.ts

@@ -105,6 +105,7 @@ export class Runtime {
   pageLabel = this.wasm.FPDF_GetPageLabel;
   pageWidth = this.wasm.FPDF_GetPageWidthF;
   pageHeight = this.wasm.FPDF_GetPageHeightF;
+  pageSize = this.wasm.FPDF_GetPageSizeByIndexF;
   pageRotation = this.wasm.FPDFPage_GetRotation<Rotation>;
   pageTransparency = this.wasm.FPDFPage_HasTransparency;
   renderPageBitmap = this.wasm.FPDF_RenderPageBitmap;

packages/pdfium/dist/index.d.ts

@@ -38,7 +38,7 @@ export interface FPDF_Bindings {
     size?: number
   ): number;
   FPDF_GetPageSizeByIndexF(
-    docPtr: numbern,
+    docPtr: number,
     pageIdx: number,
     rectPtr: number
   ): boolean;