[librsvg: 14/30] reftests: add reftest for feConvolveMatrix divisor attribute

[Federico Mena Quintero <federico src gnome org>]

commit 914b2e5e1166562dbe533057b5726cb70cd89942
Author: Paolo Borelli <pborelli gnome org>
Date:   Sun Dec 27 11:03:00 2020 +0100

    reftests: add reftest for feConvolveMatrix divisor attribute

 .../fixtures/reftests/filter-conv-divisor-ref.png  | Bin 0 -> 1410 bytes
 tests/fixtures/reftests/filter-conv-divisor.svg    |  70 +++++++++++++++++++++
 2 files changed, 70 insertions(+)
---
diff --git a/tests/fixtures/reftests/filter-conv-divisor-ref.png 
b/tests/fixtures/reftests/filter-conv-divisor-ref.png
new file mode 100644
index 00000000..1a581f98
Binary files /dev/null and b/tests/fixtures/reftests/filter-conv-divisor-ref.png differ
diff --git a/tests/fixtures/reftests/filter-conv-divisor.svg b/tests/fixtures/reftests/filter-conv-divisor.svg
new file mode 100644
index 00000000..9f2d729e
--- /dev/null
+++ b/tests/fixtures/reftests/filter-conv-divisor.svg
@@ -0,0 +1,70 @@
+<svg id="svg-root" width="100%" height="100%"
+  viewBox="0 0 480 360" xmlns="http://www.w3.org/2000/svg";
+  xmlns:xlink="http://www.w3.org/1999/xlink";>
+
+  <!-- no divisor specified, sum of matrix elements is 0: divisor is 1 -->
+  <filter id="conv1">
+    <feConvolveMatrix kernelMatrix="1 0 0
+                                    0 0 0
+                                    0 0 -1"/>
+  </filter>
+
+  <!-- divisor set to 0, sum of matrix elements is 0: divisor is 1 -->
+  <filter id="conv2">
+    <feConvolveMatrix kernelMatrix="1 0 0
+                                    0 0 0
+                                    0 0 -1" divisor="0"/>
+  </filter>
+
+  <!-- no divisor specified, sum of matrix elements is 2: divisor is 2 -->
+  <filter id="conv3">
+    <feConvolveMatrix kernelMatrix="1 0 0
+                                    0 0 0
+                                    0 0 1"/>
+  </filter>
+
+  <!-- divisor set to 0, sum of matrix elements is 2: divisor is 2 -->
+  <filter id="conv4">
+    <feConvolveMatrix kernelMatrix="1 0 0
+                                    0 0 0
+                                    0 0 1" divisor="0"/>
+  </filter>
+
+  <!-- divisor set to 1, sum of matrix elements is 2: divisor is 1 -->
+  <filter id="conv5">
+    <feConvolveMatrix kernelMatrix="1 0 0
+                                    0 0 0
+                                    0 0 1" divisor="1"/>
+  </filter>
+
+  <g transform="translate(20 20)">
+    <rect fill="blue" x="1" y="1" width="100" height="100"/>
+    <rect fill="blue" stroke="white" stroke-width="2" x="25" y="25" width="50" height="50"/>
+  </g>
+
+  <g transform="translate(140 20)">
+    <rect fill="blue" x="1" y="1" width="100" height="100"/>
+    <rect fill="blue" stroke="white" stroke-width="2" x="25" y="25" width="50" height="50" 
filter="url(#conv1)"/>
+  </g>
+
+  <g transform="translate(260 20)">
+    <rect fill="blue" x="1" y="1" width="100" height="100"/>
+    <rect fill="blue" stroke="white" stroke-width="2" x="25" y="25" width="50" height="50" 
filter="url(#conv2)"/>
+  </g>
+
+  <g transform="translate(20 140)">
+    <rect fill="blue" x="1" y="1" width="100" height="100"/>
+    <rect fill="blue" stroke="white" stroke-width="2" x="25" y="25" width="50" height="50" 
filter="url(#conv3)"/>
+  </g>
+
+  <g transform="translate(140 140)">
+    <rect fill="blue" x="1" y="1" width="100" height="100"/>
+    <rect fill="blue" stroke="white" stroke-width="2" x="25" y="25" width="50" height="50" 
filter="url(#conv4)"/>
+  </g>
+
+  <g transform="translate(260 140)">
+    <rect fill="blue" x="1" y="1" width="100" height="100"/>
+    <rect fill="blue" stroke="white" stroke-width="2" x="25" y="25" width="50" height="50" 
filter="url(#conv5)"/>
+  </g>
+
+</svg>