LayoutTests/svg/filters/feTurbulence-bad-seeds.html - Issue 882173004: Add a regression test for feTurbulence seeds that generate zero vectors.

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Issue 882173004: Add a regression test for feTurbulence seeds that generate zero vectors. (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master

Patch Set: Created 5 years, 10 months ago

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	1 <!doctype html>

	2 <!--

	3 This test determines whether the feTurbulence algorithm allows zero length vecto rs on some particular seeds. These zero length

	4 vectors result in large rectangular holes in the generated image.

	5 Seed 514 is the first seed value that demonstrates the error.

	6 Others are: 1977,2337,4777,8032,9615,14783,14862,14921,18607,19537,19852,19955,2 2456,23056,26678,27351,29383,29560,29929, ...

	7 The feTurbulence algorithm in the specification uses rejection sampling to avoid generating zero length vectors and so in a

	8 correct implementation we should not see any large holes in the image.

	9 -->

	10 <html>

	11 <body>

	12 <svg viewbox="0 0 512 256">

	13 <desc>Test passes if there are no red squares.</desc>

	14 <defs>

	15 <filter id="turb1" filterUnits="objectBoundingBox" x="0" y="0" width="10 0%" height="100%">

	16 <feTurbulence x="0" y="0" width="100%" height="100%" baseFrequency=" 0.02 0.1" numOctaves="5" seed="514" result="a" />

	17 <feComponentTransfer in="a">

	18 <!-- set colour to black everywhere and set opacity to full if a lpha > 0 -->

	19 <feFuncR type="linear" slope="-10000" intercept="0"/><feFuncG ty pe="linear" slope="-10000" intercept="0"/><feFuncB type="linear" slope="-10000" intercept="0"/>

	20 <feFuncA type="linear" slope="10000" intercept="0"/>

	21 </feComponentTransfer>

	22 </filter>

	23 <filter id="turb2" filterUnits="objectBoundingBox" x="0" y="0" width="10 0%" height="100%">

	24 <feTurbulence x="0" y="0" width="100%" height="100%" baseFrequency=" 0.02 0.1" numOctaves="5" seed="14783" result="a" />

	25 <feComponentTransfer in="a">

	26 <feFuncR type="linear" slope="-10000" intercept="0"/><feFuncG ty pe="linear" slope="-10000" intercept="0"/><feFuncB type="linear" slope="-10000" intercept="0"/>

	27 <feFuncA type="linear" slope="10000" intercept="0"/>

	28 </feComponentTransfer>

	29 </filter>

	30 <filter id="turb3" filterUnits="objectBoundingBox" x="0" y="0" width="10 0%" height="100%">

	31 <feTurbulence x="0" y="0" width="100%" height="100%" baseFrequency=" 0.02 0.1" numOctaves="5" seed="23056" result="a" />

	32 <feComponentTransfer in="a">

	33 <feFuncR type="linear" slope="-10000" intercept="0"/><feFuncG ty pe="linear" slope="-10000" intercept="0"/><feFuncB type="linear" slope="-10000" intercept="0"/>

	34 <feFuncA type="linear" slope="10000" intercept="0"/>

	35 </feComponentTransfer>

	36 </filter>

	37 <filter id="turb4" filterUnits="objectBoundingBox" x="0" y="0" width="10 0%" height="100%">

	38 <feTurbulence x="0" y="0" width="100%" height="100%" baseFrequency=" 0.02 0.1" numOctaves="5" seed="9615" result="a" />

	39 <feComponentTransfer in="a">

	40 <feFuncR type="linear" slope="-10000" intercept="0"/><feFuncG ty pe="linear" slope="-10000" intercept="0"/><feFuncB type="linear" slope="-10000" intercept="0"/>

	41 <feFuncA type="linear" slope="10000" intercept="0"/>

	42 </feComponentTransfer>

	43 </filter>

	44 </defs>

	45 <rect x="0" y="0" width="256" height="128" fill="red" />

	46 <rect x="0" y="0" width="64" height="128" fill="black" filter="url(#turb1)"/ >

	47 <rect x="64" y="0" width="64" height="128" fill="blue" filter="url(#turb2)"/ >

	48 <rect x="128" y="0" width="64" height="128" fill="black" filter="url(#turb3) "/>

	49 <rect x="192" y="0" width="64" height="128" fill="blue" filter="url(#turb4)" />

	50 </svg>

	51 </body>

	52 </html>

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