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- Manifest: toolkit/components/printing/tests/browser.toml
/* Any copyright is dedicated to the Public Domain.
"use strict";
/**
* Print file_print_images.html to PDF.
*
* @returns {Promise<{imageCount: number, pdf: string}>} the number of images
* in the page, and the contents of the PDF as a latin1 string.
*/
async function printImagesToPDF() {
let result;
await BrowserTestUtils.withNewTab(
PrintHelper.getTestPageUrl("file_print_images.html"),
async function (browser) {
let imageCount = await SpecialPowers.spawn(browser, [], async () => {
await content.wrappedJSObject.imagesLoaded;
return content.document.images.length;
});
// FIXME(emilio): would be nice to use pdf.js for this, but the relevant
// APIs (getOperatorList) are compiled out in Firefox.
// SkPDF doesn't compress object dictionaries, so look at them directly.
let pdf = new TextDecoder("latin1").decode(
await PrintHelper.printToPDF(browser)
);
result = { imageCount, pdf };
}
);
return result;
}
// Check that images that don't repeat are written to the PDF as plain image
// XObjects, rather than as tiling patterns.
add_task(async function testImagesAreNotPatterns() {
let { imageCount, pdf } = await printImagesToPDF();
let images = pdf.match(/\/Subtype\s*\/Image\b/g) || [];
is(images.length, imageCount, "Should write every image as an XObject");
let patterns = pdf.match(/\/PatternType\s*1\b/g) || [];
is(patterns.length, 0, "Shouldn't write images as tiling patterns");
});
/**
* Print file_print_images.html to PDF with the given image encoding quality.
*
* @param {number} quality - the value of print.skpdf.image-encoding-quality.
* @returns {Promise<number>} the size of the PDF in bytes.
*/
async function printImagesWithQuality(quality) {
await SpecialPowers.pushPrefEnv({
set: [["print.skpdf.image-encoding-quality", quality]],
});
let { pdf } = await printImagesToPDF();
await SpecialPowers.popPrefEnv();
return pdf.length;
}
// Check that lowering the image encoding quality makes the PDF smaller.
add_task(async function testLossyImageEncoding() {
let size90 = await printImagesWithQuality(90);
let size80 = await printImagesWithQuality(80);
Assert.less(size80, size90, "Lower quality should produce a smaller PDF");
});