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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
| commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
| tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /testing/web-platform/tests/resize-observer/devicepixel.html | |
| parent | Initial commit. (diff) | |
| download | thunderbird-upstream.tar.xz thunderbird-upstream.zip | |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/resize-observer/devicepixel.html')
| -rw-r--r-- | testing/web-platform/tests/resize-observer/devicepixel.html | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/testing/web-platform/tests/resize-observer/devicepixel.html b/testing/web-platform/tests/resize-observer/devicepixel.html new file mode 100644 index 0000000000..e92079bea5 --- /dev/null +++ b/testing/web-platform/tests/resize-observer/devicepixel.html @@ -0,0 +1,85 @@ +<!doctype html> +<link rel="match" href="devicepixel-ref.html"> +<meta name="assert" content="Device pixel content box sizes and pixel snapping are correct in Resize Observer callback"> +<!-- + This test verifies that the device pixel content box sizes available + in a resize observer callback are correct. Resize observer notifications + are delivered as the element is loaded. A box is then drawn using the + available dimensions in device pixels. The result is compared to the reference + which uses div and border to draw a box. +--> + +<style> + #canvas2D { + width: 100%; + height: 100%; + } + #canvas2DPadding14 { + width: 100%; + height: 100%; + } + #outer { + padding-top: 1.7px; + width: 300.8px; + height: 250.1px; + } + #outer2 { + padding-top: 1.4px; + width: 300.8px; + height: 250.1px; + } + +</style> +<body> + <div id="outer"> + <canvas id="canvas2D"></canvas> + </div> + <div id="outer2"> + <canvas id="canvas2DPadding14"></canvas> + </div> +</body> + +<script> + // Create a box using device pixel content box dimensions + function paint2D(ctx, snappedSize) { + ctx.beginPath(); + // Use a linewidth of 2. Because the rectangle is drawn at 0,0 with + // its dimensions being the same as canvas dimensions, linewidth as it + // is drawn on the canvas will be 1. + ctx.lineWidth = window.devicePixelRatio * 2; + ctx.strokeStyle = "green"; + ctx.rect(0, 0, snappedSize.inlineSize, snappedSize.blockSize); + ctx.stroke(); + } + + function updateCanvasSize2D(canvas2D, ctx, snappedSize) { + canvas2D.width = snappedSize.inlineSize; + canvas2D.height = snappedSize.blockSize; + paint2D(ctx, snappedSize); + } + + (function() { + let canvas2D = document.querySelector("#canvas2D"); + let canvas2DPadding14 = document.querySelector("#canvas2DPadding14"); + + function observeSizes() { + let ro = new ResizeObserver( entries => { + for (entry of entries) { + let size = entry.devicePixelContentBoxSize[0]; + if (entry.target == canvas2D) { + let canvas2D = document.querySelector("#canvas2D"); + let ctx = canvas2D.getContext("2d"); + updateCanvasSize2D(canvas2D, ctx, size); + } else if (entry.target == canvas2DPadding14){ + let canvas2DPadding14 = document.querySelector("#canvas2DPadding14"); + let ctx = canvas2DPadding14.getContext("2d"); + updateCanvasSize2D(canvas2DPadding14, ctx, size); + } + } + }); + ro.observe(canvas2D, {box: "device-pixel-content-box"}); + ro.observe(canvas2DPadding14, {box: "device-pixel-content-box"}); + } + observeSizes(); + })(); +</script> |