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new file mode 100644
index 00000000..b885044a
--- /dev/null
+++ b/images/invalid-clipping-postgis-256-256-1.0-svg-reference.svg
@@ -0,0 +1,8 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="256px" height="256px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
+<g id="style" inkscape:groupmode="layer" inkscape:label="style">
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+</g>
+</svg>
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diff --git a/images/invalid-clipping-postgis-256-256-2.0-svg-reference.svg b/images/invalid-clipping-postgis-256-256-2.0-svg-reference.svg
new file mode 100644
index 00000000..b885044a
--- /dev/null
+++ b/images/invalid-clipping-postgis-256-256-2.0-svg-reference.svg
@@ -0,0 +1,8 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="256px" height="256px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
+<g id="style" inkscape:groupmode="layer" inkscape:label="style">
+<path d="M179.1454 19.8302 L197.4611 6.2343 L222.3182 -9.6275 L88.875 -27.7554 L103.5584 -15.919 L107.4629 -0.0922 L116.3486 10.7663 L123.3999 7.6171 L150.3636 -2.8296 L179.1454 19.8302" stroke-dasharray="" fill="#374c70" fill-opacity="0.0" stroke="#ff0000" stroke-opacity="1.0" stroke-width="2.0px" stroke-linecap="butt" stroke-linejoin="miter" stroke-dashoffset="0.0px"/>
+<path d="M179.1454 19.8302 L197.4611 6.2343 L222.3182 -9.6275 L88.875 -27.7554 L103.5584 -15.919 L107.4629 -0.0922 L116.3486 10.7663 L123.3999 7.6171 L150.3636 -2.8296 L179.1454 19.8302" stroke-dasharray="" fill="#374c70" fill-opacity="0.0" stroke="#0000ff" stroke-opacity="1.0" stroke-width="2.0px" stroke-linecap="butt" stroke-linejoin="miter" stroke-dashoffset="0.0px"/>
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+</svg>
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diff --git a/images/line-offset-clip-world-512-512-2.0-grid-reference.png b/images/line-offset-clip-world-512-512-2.0-grid-reference.png
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diff --git a/images/poly-negative-offset-postgis-512-512-1.0-svg-reference.svg b/images/poly-negative-offset-postgis-512-512-1.0-svg-reference.svg
new file mode 100644
index 00000000..ae2eb678
--- /dev/null
+++ b/images/poly-negative-offset-postgis-512-512-1.0-svg-reference.svg
@@ -0,0 +1,8 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="512px" height="512px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
+<g id="94b69b98-2d3a-4cef-866b-5cc06b92d8b4" inkscape:groupmode="layer" inkscape:label="94b69b98-2d3a-4cef-866b-5cc06b92d8b4">
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+</g>
+</svg>
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diff --git a/images/poly-negative-offset-postgis-512-512-2.0-agg-reference.png b/images/poly-negative-offset-postgis-512-512-2.0-agg-reference.png
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diff --git a/images/poly-negative-offset-postgis-512-512-2.0-grid-reference.png b/images/poly-negative-offset-postgis-512-512-2.0-grid-reference.png
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diff --git a/images/poly-negative-offset-postgis-512-512-2.0-svg-reference.svg b/images/poly-negative-offset-postgis-512-512-2.0-svg-reference.svg
new file mode 100644
index 00000000..ae2eb678
--- /dev/null
+++ b/images/poly-negative-offset-postgis-512-512-2.0-svg-reference.svg
@@ -0,0 +1,8 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="512px" height="512px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
+<g id="94b69b98-2d3a-4cef-866b-5cc06b92d8b4" inkscape:groupmode="layer" inkscape:label="94b69b98-2d3a-4cef-866b-5cc06b92d8b4">
+<path d="M476.0348 538.0646 L481.2679 538.0646 L483.8844 533.5326 L483.8844 524.4687 L491.2 511.7977 L491.734 501.8089 L491.4546 501.325 L497.768 473.2299 L499.5836 470.0851 L512.6663 447.4252 L518.7376 442.8933 L523.1324 438.3613 L520.5159 433.8293 L515.2828 433.8293 L504.8167 424.7654 L496.9671 420.2334 L489.1175 415.7015 L481.2679 411.1695 L476.0348 411.1695 L475.6322 411.8669 L468.1852 424.7654 L465.5687 429.2974 L452.486 433.8293 L444.6364 438.3613 L442.0199 442.8933 L442.1622 443.1398 L437.9923 461.0211 L434.1703 465.5531 L435.8088 468.3911 L436.7868 470.0851 L428.9372 501.8089 L426.3207 506.3408 L431.2121 510.8728 L436.7868 524.4687 L440.3598 524.4687 L452.486 524.4687 L457.7191 524.4687 L468.1852 533.5326 L476.0348 538.0646" stroke-dasharray="" fill="#374c70" fill-opacity="0.0" stroke="#ff0000" stroke-opacity="1.0" stroke-width="2.0px" stroke-linecap="butt" stroke-linejoin="miter" stroke-dashoffset="0.0px"/>
+<path d="M476.0348 538.0646 L481.2679 538.0646 L483.8844 533.5326 L483.8844 524.4687 L491.2 511.7977 L491.734 501.8089 L491.4546 501.325 L497.768 473.2299 L499.5836 470.0851 L512.6663 447.4252 L518.7376 442.8933 L523.1324 438.3613 L520.5159 433.8293 L515.2828 433.8293 L504.8167 424.7654 L496.9671 420.2334 L489.1175 415.7015 L481.2679 411.1695 L476.0348 411.1695 L475.6322 411.8669 L468.1852 424.7654 L465.5687 429.2974 L452.486 433.8293 L444.6364 438.3613 L442.0199 442.8933 L442.1622 443.1398 L437.9923 461.0211 L434.1703 465.5531 L435.8088 468.3911 L436.7868 470.0851 L428.9372 501.8089 L426.3207 506.3408 L431.2121 510.8728 L436.7868 524.4687 L440.3598 524.4687 L452.486 524.4687 L457.7191 524.4687 L468.1852 533.5326 L476.0348 538.0646" stroke-dasharray="" fill="#374c70" fill-opacity="0.0" stroke="#0000ff" stroke-opacity="1.0" stroke-width="2.0px" stroke-linecap="butt" stroke-linejoin="miter" stroke-dashoffset="0.0px"/>
+</g>
+</svg>
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diff --git a/styles/invalid-clipping-postgis.xml b/styles/invalid-clipping-postgis.xml
new file mode 100644
index 00000000..fdf034ac
--- /dev/null
+++ b/styles/invalid-clipping-postgis.xml
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE Map[]>
+<Map srs="+init=epsg:3857" maximum-extent="-20037508.3,-20037508.3,20037508.3,20037508.3">
+<Parameters>
+  <Parameter name="format">png8:m=h</Parameter>
+  <Parameter name="sizes">256, 256</Parameter>
+</Parameters>
+<Style name="style-2" filter-mode="first">
+  <Rule>
+    <PolygonSymbolizer fill="#374c70" fill-opacity="0" clip="true" />
+    <LineSymbolizer stroke-width="2" stroke="#0000ff" stroke-opacity="1" offset="-3" clip="true" />
+  </Rule>
+</Style>
+<Style name="style" filter-mode="first">
+  <Rule>
+    <PolygonSymbolizer fill="#374c70" fill-opacity="0" clip="true" />
+    <LineSymbolizer stroke-width="2" stroke="#ff0000" stroke-opacity="1" clip="true" />
+  </Rule>
+</Style>
+<Layer name="style"
+  cache-features="true"
+  srs="+init=epsg:3857">
+    <StyleName>style</StyleName>
+    <StyleName>style-2</StyleName>
+    <Datasource>
+       <Parameter name="type"><![CDATA[postgis]]></Parameter>
+       <Parameter name="extent"><![CDATA[-430493.3433021121,4911537.689492285,-410925.4640611075,4931105.56873329]]></Parameter>
+       <Parameter name="table"><![CDATA[( SELECT 'MULTIPOLYGON(((-416800 4929589.80342178,-418999.999999999 4931321.85422935,-421061.021259895 4930523.34162098,-421600 4930282.62374481,-422279.19619103 4931112.61564309,-422577.649071302 4932322.37150495,-423700.000000001 4933227.11011767,-413500 4931841.46947162,-415400 4930629.03390632,-416800 4929589.80342178)))'::geometry as geom) as cdbq]]></Parameter>
+       <Parameter name="dbname"><![CDATA[template_postgis]]></Parameter>
+       <Parameter name="geometry_field"><![CDATA[geom]]></Parameter>
+    </Datasource>
+  </Layer>
+</Map>
diff --git a/styles/poly-negative-offset-postgis.xml b/styles/poly-negative-offset-postgis.xml
new file mode 100644
index 00000000..fb1120c5
--- /dev/null
+++ b/styles/poly-negative-offset-postgis.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE Map[]>
+<Map srs="+init=epsg:3857" maximum-extent="-20037508.3,-20037508.3,20037508.3,20037508.3">
+<Parameters>
+  <Parameter name="maximum-extent"><![CDATA[-20037508.3,-20037508.3,20037508.3,20037508.3]]></Parameter>
+  <Parameter name="format">png8:m=h</Parameter>
+  <Parameter name="sizes">512,512</Parameter>
+</Parameters>
+<Style name="94b69b98-2d3a-4cef-866b-5cc06b92d8b4-2" filter-mode="first">
+  <Rule>
+    <PolygonSymbolizer fill="#374c70" fill-opacity="0" clip="true" />
+    <LineSymbolizer stroke-width="2" stroke="#0000ff" stroke-opacity="1" offset="-3" clip="true" />
+  </Rule>
+</Style>
+<Style name="94b69b98-2d3a-4cef-866b-5cc06b92d8b4" filter-mode="first">
+  <Rule>
+    <PolygonSymbolizer fill="#374c70" fill-opacity="0" clip="true" />
+    <LineSymbolizer stroke-width="2" stroke="#ff0000" stroke-opacity="1" clip="true" />
+  </Rule>
+</Style>
+<Layer name="94b69b98-2d3a-4cef-866b-5cc06b92d8b4"
+  cache-features="true"
+  srs="+init=epsg:3857">
+    <StyleName>94b69b98-2d3a-4cef-866b-5cc06b92d8b4</StyleName>
+    <StyleName>94b69b98-2d3a-4cef-866b-5cc06b92d8b4-2</StyleName>
+    <Datasource>
+       <Parameter name="type"><![CDATA[postgis]]></Parameter>
+       <Parameter name="extent"><![CDATA[-430493.3433021121,4931105.56873329,-410925.4640611075,4950673.447974296]]></Parameter>
+       <Parameter name="srid"><![CDATA[3857]]></Parameter>
+       <Parameter name="table"><![CDATA[(SELECT 'MULTIPOLYGON(((-412299.999999999 4930109.41866405,-412600.000000001 4930282.62374481,-413000 4930629.03390632,-413199.999999998 4930629.03390632,-413663.446061848 4930629.03390632,-413799.999999999 4930629.03390632,-414013.057706249 4931148.64914859,-414199.999999999 4931321.85422935,-414100.000000001 4931495.05931011,-413799.999999999 4932707.4948754,-413837.378283508 4932772.23560434,-413900 4932880.69995616,-413753.929815808 4933053.90503692,-413594.559402948 4933737.30189091,-413600.000000001 4933746.72535995,-413500 4933919.9304407,-413199.999999998 4934093.13552146,-412700.000000001 4934266.34060222,-412600.000000001 4934439.54568297,-412315.388123141 4934932.50771537,-412299.999999999 4934959.16092524,-412100 4934959.16092524,-411799.999999999 4934785.95584449,-411500 4934612.75076373,-411200.000000001 4934439.54568297,-410800.000000001 4934093.13552146,-410600 4934093.13552146,-410499.999999999 4933919.9304407,-410667.963986838 4933746.72535995,-410899.999999999 4933573.52027919,-411399.999999999 4932707.4948754,-411469.39102008 4932587.30577891,-411710.677259835 4931513.55272111,-411700.000000001 4931495.05931011,-411720.407807962 4931113.30154051,-412000 4930629.03390632,-412000 4930282.62374481,-412100 4930109.41866405,-412299.999999999 4930109.41866405)))'::geometry as geo) as cdbq]]></Parameter>
+       <Parameter name="dbname"><![CDATA[template_postgis]]></Parameter>
+       <Parameter name="geometry_field"><![CDATA[geo]]></Parameter>
+    </Datasource>
+  </Layer>
+</Map>