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Test Info:
/* Any copyright is dedicated to the Public Domain.
const URL =
"test/background_red_scroll.html";
function isRedThumbnailFuzz(r, g, b, expectedR, expectedB, expectedG, aFuzz) {
return (
Math.abs(r - expectedR) <= aFuzz &&
Math.abs(g - expectedG) <= aFuzz &&
Math.abs(b - expectedB) <= aFuzz
);
}
// Test for black borders caused by scrollbars.
add_task(async function thumbnails_bg_bug727765() {
// Create a tab with a page with a red background and scrollbars.
await BrowserTestUtils.withNewTab(
{
gBrowser,
url: URL,
},
async () => {
await captureAndCheckColor(255, 0, 0, "we have a red thumbnail");
// Check the thumbnail color of the bottom right pixel.
await whenFileExists(URL);
let data = await retrieveImageDataForURL(URL);
let [r, g, b] = [].slice.call(data, -4);
let fuzz = 2; // Windows 8 x64 blends with the scrollbar a bit.
var message =
"Expected red thumbnail rgb(255, 0, 0), got " + r + "," + g + "," + b;
ok(isRedThumbnailFuzz(r, g, b, 255, 0, 0, fuzz), message);
}
);
});