BREAKING CHANGE(smartpdf): improve image generation quality and API consistency
- Renamed convertPDFToWebpPreviews to convertPDFToWebpBytes for consistency - Added configurable scale options with DPI support - Changed default scale to 3.0 (216 DPI) for better quality - Added DPI helper methods and scale constants
This commit is contained in:
104
test/test.ts
104
test/test.ts
@@ -15,6 +15,13 @@ function ensureDir(dirPath: string): void {
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}
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}
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// Clean test results directory at start
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const testResultsDir = path.join('.nogit', 'testresults');
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if (fs.existsSync(testResultsDir)) {
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fs.rmSync(testResultsDir, { recursive: true, force: true });
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}
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ensureDir(testResultsDir);
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tap.test('should create a valid instance of SmartPdf', async () => {
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testSmartPdf = new smartpdf.SmartPdf();
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expect(testSmartPdf).toBeInstanceOf(smartpdf.SmartPdf);
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@@ -65,19 +72,108 @@ tap.test('should create PNG images from combined PDF using Puppeteer conversion'
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});
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tap.test('should store PNG results from both conversion functions in .nogit/testresults', async () => {
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const testResultsDir = path.join('.nogit', 'testresults');
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ensureDir(testResultsDir);
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const pdfObject = await testSmartPdf.readFileToPdfObject('.nogit/combined.pdf');
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// Convert using Puppeteer-based function and store images
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const imagesPuppeteer = await testSmartPdf.convertPDFToPngBytes(pdfObject.buffer);
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imagesPuppeteer.forEach((img, index) => {
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const filePath = path.join(testResultsDir, `puppeteer_method_page_${index + 1}.png`);
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const filePath = path.join(testResultsDir, `png_combined_page${index + 1}.png`);
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fs.writeFileSync(filePath, Buffer.from(img));
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});
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});
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tap.test('should create WebP preview images from PDF', async () => {
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const pdfObject = await testSmartPdf.readFileToPdfObject('.nogit/3.pdf');
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const webpPreviews = await testSmartPdf.convertPDFToWebpBytes(pdfObject.buffer);
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expect(webpPreviews.length).toBeGreaterThan(0);
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console.log('WebP preview sizes:', webpPreviews.map(img => img.length));
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// Also create PNG previews for comparison
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const pngPreviews = await testSmartPdf.convertPDFToPngBytes(pdfObject.buffer);
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console.log('PNG preview sizes:', pngPreviews.map(img => img.length));
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// Save the first page as both WebP and PNG preview
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fs.writeFileSync(path.join(testResultsDir, 'webp_default_page1.webp'), Buffer.from(webpPreviews[0]));
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fs.writeFileSync(path.join(testResultsDir, 'png_default_page1.png'), Buffer.from(pngPreviews[0]));
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});
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tap.test('should create WebP previews with custom scale and quality', async () => {
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const pdfObject = await testSmartPdf.readFileToPdfObject('.nogit/3.pdf');
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// Create smaller previews with lower quality for thumbnails
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const thumbnails = await testSmartPdf.convertPDFToWebpBytes(pdfObject.buffer, {
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scale: 0.5, // Create readable thumbnails at ~36 DPI
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quality: 70
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});
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expect(thumbnails.length).toBeGreaterThan(0);
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console.log('Thumbnail sizes:', thumbnails.map(img => img.length));
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// Save thumbnails
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thumbnails.forEach((thumb, index) => {
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fs.writeFileSync(path.join(testResultsDir, `webp_thumbnail_page${index + 1}.webp`), Buffer.from(thumb));
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});
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});
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tap.test('should create WebP previews with max dimensions', async () => {
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const pdfObject = await testSmartPdf.readFileToPdfObject('.nogit/3.pdf');
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// Create previews with maximum dimensions (will use high scale but constrain to max size)
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const constrainedPreviews = await testSmartPdf.convertPDFToWebpBytes(pdfObject.buffer, {
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scale: smartpdf.SmartPdf.SCALE_HIGH, // Start with high quality
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quality: 90,
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maxWidth: 800,
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maxHeight: 1000
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});
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expect(constrainedPreviews.length).toBeGreaterThan(0);
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console.log('Constrained preview sizes:', constrainedPreviews.map(img => img.length));
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// Save constrained preview
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fs.writeFileSync(path.join(testResultsDir, 'webp_constrained_page1.webp'), Buffer.from(constrainedPreviews[0]));
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});
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tap.test('should verify WebP files are smaller than PNG', async () => {
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const pdfObject = await testSmartPdf.readFileToPdfObject('.nogit/3.pdf');
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// Generate both PNG and WebP versions at the same scale for fair comparison
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const comparisonScale = smartpdf.SmartPdf.SCALE_HIGH; // Both use 3.0 scale
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const pngImages = await testSmartPdf.convertPDFToPngBytes(pdfObject.buffer, {
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scale: comparisonScale
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});
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const webpImages = await testSmartPdf.convertPDFToWebpBytes(pdfObject.buffer, {
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scale: comparisonScale,
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quality: 85
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});
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expect(pngImages.length).toEqual(webpImages.length);
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// Compare sizes
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let totalPngSize = 0;
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let totalWebpSize = 0;
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pngImages.forEach((png, index) => {
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const pngSize = png.length;
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const webpSize = webpImages[index].length;
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totalPngSize += pngSize;
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totalWebpSize += webpSize;
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const reduction = ((pngSize - webpSize) / pngSize * 100).toFixed(1);
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console.log(`Page ${index + 1}: PNG=${pngSize} bytes, WebP=${webpSize} bytes, Reduction=${reduction}%`);
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// Save comparison files
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fs.writeFileSync(path.join(testResultsDir, `comparison_png_page${index + 1}.png`), Buffer.from(png));
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fs.writeFileSync(path.join(testResultsDir, `comparison_webp_page${index + 1}.webp`), Buffer.from(webpImages[index]));
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});
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const totalReduction = ((totalPngSize - totalWebpSize) / totalPngSize * 100).toFixed(1);
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console.log(`Total size reduction: ${totalReduction}% (PNG: ${totalPngSize} bytes, WebP: ${totalWebpSize} bytes)`);
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// WebP should be smaller
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expect(totalWebpSize).toBeLessThan(totalPngSize);
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});
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tap.test('should close the SmartPdf instance properly', async () => {
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await testSmartPdf.stop();
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});
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