<feComposite>
La primitive de filtre SVG <feComposite>
effectue la combinaison de deux images en entrée, pixel par pixel, en utilisant une des opérations de composition de Porter-Duff: over
, in
, atop
, out
, xor
, et lighter
. Il est également possible d'appliquer une opération de type arithmetic
(avec un résultat borné entre [0..1]).
L'opération arithmetic
est utile pour combiner le résultat de <feDiffuseLighting>
et <feSpecularLighting>
avec des textures. Si l'opération arithmetic
est choisie, chaque pixel est calculé à l'aide de la formule suivante:
result = k1*i1*i2 + k2*i1 + k3*i2 + k4
où
Contexte d'utilisation
Attributs
Attributs globaux
Attributs spécifiques
Interface DOM
Cet élément implémente l'interface SVGFECompositeElement
.
Exemple
SVG
<svg
width="330"
height="195"
viewBox="0 0 1100 650"
version="1.1"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink">
<title>Example feComposite - Examples of feComposite operations</title>
<desc>
Four rows of six pairs of overlapping triangles depicting the six different
feComposite operators under different opacity values and different clearing
of the background.
</desc>
<defs>
<desc>
Define two sets of six filters for each of the six compositing operators.
The first set wipes out the background image by flooding with opaque
white. The second set does not wipe out the background, with the result
that the background sometimes shines through and is other cases is blended
into itself (i.e., "double-counting").
</desc>
<filter
id="overFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood" />
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="over"
result="comp" />
<feMerge>
<feMergeNode in="flood" />
<feMergeNode in="comp" />
</feMerge>
</filter>
<filter
id="inFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood" />
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="in"
result="comp" />
<feMerge>
<feMergeNode in="flood" />
<feMergeNode in="comp" />
</feMerge>
</filter>
<filter
id="outFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood" />
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="out"
result="comp" />
<feMerge>
<feMergeNode in="flood" />
<feMergeNode in="comp" />
</feMerge>
</filter>
<filter
id="atopFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood" />
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="atop"
result="comp" />
<feMerge>
<feMergeNode in="flood" />
<feMergeNode in="comp" />
</feMerge>
</filter>
<filter
id="xorFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood" />
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="xor"
result="comp" />
<feMerge>
<feMergeNode in="flood" />
<feMergeNode in="comp" />
</feMerge>
</filter>
<filter
id="arithmeticFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feFlood flood-color="#ffffff" flood-opacity="1" result="flood" />
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
result="comp"
operator="arithmetic"
k1=".5"
k2=".5"
k3=".5"
k4=".5" />
<feMerge>
<feMergeNode in="flood" />
<feMergeNode in="comp" />
</feMerge>
</filter>
<filter
id="overNoFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="over"
result="comp" />
</filter>
<filter
id="inNoFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="in"
result="comp" />
</filter>
<filter
id="outNoFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="out"
result="comp" />
</filter>
<filter
id="atopNoFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="atop"
result="comp" />
</filter>
<filter
id="xorNoFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
operator="xor"
result="comp" />
</filter>
<filter
id="arithmeticNoFlood"
filterUnits="objectBoundingBox"
x="-5%"
y="-5%"
width="110%"
height="110%">
<feComposite
in="SourceGraphic"
in2="BackgroundImage"
result="comp"
operator="arithmetic"
k1=".5"
k2=".5"
k3=".5"
k4=".5" />
</filter>
<path id="Blue100" d="M 0 0 L 100 0 L 100 100 z" fill="#00ffff" />
<path id="Red100" d="M 0 0 L 0 100 L 100 0 z" fill="#ff00ff" />
<path
id="Blue50"
d="M 0 125 L 100 125 L 100 225 z"
fill="#00ffff"
fill-opacity=".5" />
<path
id="Red50"
d="M 0 125 L 0 225 L 100 125 z"
fill="#ff00ff"
fill-opacity=".5" />
<g id="TwoBlueTriangles">
<use xlink:href="#Blue100" />
<use xlink:href="#Blue50" />
</g>
<g id="BlueTriangles">
<use transform="translate(275,25)" xlink:href="#TwoBlueTriangles" />
<use transform="translate(400,25)" xlink:href="#TwoBlueTriangles" />
<use transform="translate(525,25)" xlink:href="#TwoBlueTriangles" />
<use transform="translate(650,25)" xlink:href="#TwoBlueTriangles" />
<use transform="translate(775,25)" xlink:href="#TwoBlueTriangles" />
<use transform="translate(900,25)" xlink:href="#TwoBlueTriangles" />
</g>
</defs>
<rect fill="none" stroke="blue" x="1" y="1" width="1098" height="648" />
<g font-family="Verdana" font-size="40" shape-rendering="crispEdges">
<desc>
Render the examples using the filters that draw on top of an opaque white
surface, thus obliterating the background.
</desc>
<g enable-background="new">
<text x="15" y="75">opacity 1.0</text>
<text x="15" y="115" font-size="27">(with feFlood)</text>
<text x="15" y="200">opacity 0.5</text>
<text x="15" y="240" font-size="27">(with feFlood)</text>
<use xlink:href="#BlueTriangles" />
<g transform="translate(275,25)">
<use xlink:href="#Red100" filter="url(#overFlood)" />
<use xlink:href="#Red50" filter="url(#overFlood)" />
<text x="5" y="275">over</text>
</g>
<g transform="translate(400,25)">
<use xlink:href="#Red100" filter="url(#inFlood)" />
<use xlink:href="#Red50" filter="url(#inFlood)" />
<text x="35" y="275">in</text>
</g>
<g transform="translate(525,25)">
<use xlink:href="#Red100" filter="url(#outFlood)" />
<use xlink:href="#Red50" filter="url(#outFlood)" />
<text x="15" y="275">out</text>
</g>
<g transform="translate(650,25)">
<use xlink:href="#Red100" filter="url(#atopFlood)" />
<use xlink:href="#Red50" filter="url(#atopFlood)" />
<text x="10" y="275">atop</text>
</g>
<g transform="translate(775,25)">
<use xlink:href="#Red100" filter="url(#xorFlood)" />
<use xlink:href="#Red50" filter="url(#xorFlood)" />
<text x="15" y="275">xor</text>
</g>
<g transform="translate(900,25)">
<use xlink:href="#Red100" filter="url(#arithmeticFlood)" />
<use xlink:href="#Red50" filter="url(#arithmeticFlood)" />
<text x="-25" y="275">arithmetic</text>
</g>
</g>
<g transform="translate(0,325)" enable-background="new">
<desc>
Render the examples using the filters that do not obliterate the
background, thus sometimes causing the background to continue to appear
in some cases, and in other cases the background image blends into
itself ("double-counting").
</desc>
<text x="15" y="75">opacity 1.0</text>
<text x="15" y="115" font-size="27">(without feFlood)</text>
<text x="15" y="200">opacity 0.5</text>
<text x="15" y="240" font-size="27">(without feFlood)</text>
<use xlink:href="#BlueTriangles" />
<g transform="translate(275,25)">
<use xlink:href="#Red100" filter="url(#overNoFlood)" />
<use xlink:href="#Red50" filter="url(#overNoFlood)" />
<text x="5" y="275">over</text>
</g>
<g transform="translate(400,25)">
<use xlink:href="#Red100" filter="url(#inNoFlood)" />
<use xlink:href="#Red50" filter="url(#inNoFlood)" />
<text x="35" y="275">in</text>
</g>
<g transform="translate(525,25)">
<use xlink:href="#Red100" filter="url(#outNoFlood)" />
<use xlink:href="#Red50" filter="url(#outNoFlood)" />
<text x="15" y="275">out</text>
</g>
<g transform="translate(650,25)">
<use xlink:href="#Red100" filter="url(#atopNoFlood)" />
<use xlink:href="#Red50" filter="url(#atopNoFlood)" />
<text x="10" y="275">atop</text>
</g>
<g transform="translate(775,25)">
<use xlink:href="#Red100" filter="url(#xorNoFlood)" />
<use xlink:href="#Red50" filter="url(#xorNoFlood)" />
<text x="15" y="275">xor</text>
</g>
<g transform="translate(900,25)">
<use xlink:href="#Red100" filter="url(#arithmeticNoFlood)" />
<use xlink:href="#Red50" filter="url(#arithmeticNoFlood)" />
<text x="-25" y="275">arithmetic</text>
</g>
</g>
</g>
</svg>
Résultat
Cette image affine le résultat désiré.
Spécifications
Specification |
---|
Filter Effects Module Level 1 # feCompositeElement |
Compatibilité des navigateurs
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