contrib: add a test image to show how zoom modes work

The image can be converted to a suitable JPEG with 'convert' from
imagemagick:

  $ convert libam7xxx_test_image_800x480.svg libam7xxx_test_image_800x480.jpg

diff --git a/contrib/libam7xxx_test_image_800x480.svg b/contrib/libam7xxx_test_image_800x480.svg
new file mode 100644 (file)
index 0000000..4591d08
--- /dev/null
+++ b/contrib/libam7xxx_test_image_800x480.svg
@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="800"
+   height="480"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.48.3.1 r9886"
+   sodipodi:docname="libam7xxx_test_image_800x480.svg"
+   inkscape:export-filename="/home/ao2/libam7xxx_test_image_800x480.png"
+   inkscape:export-xdpi="90"
+   inkscape:export-ydpi="90">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="0.98994949"
+     inkscape:cx="350.20761"
+     inkscape:cy="242.81028"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     inkscape:window-width="1152"
+     inkscape:window-height="756"
+     inkscape:window-x="0"
+     inkscape:window-y="29"
+     inkscape:window-maximized="1" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Background"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-572.36218)"
+     style="display:inline"
+     sodipodi:insensitive="true">
+    <rect
+       style="color:#000000;fill:#000400;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
+       id="rect2982"
+       width="800"
+       height="480"
+       x="0"
+       y="572.36218" />
+    <text
+       xml:space="preserve"
+       style="font-size:24px;font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;line-height:125%;letter-spacing:0.09px;word-spacing:0px;fill:#ffffff;fill-opacity:1;stroke:none;font-family:Liberation Sans;-inkscape-font-specification:Liberation Sans Bold"
+       x="274.20743"
+       y="663.45349"
+       id="text3782"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan3784"
+         x="274.20743"
+         y="663.45349">libam7xxx test screen</tspan></text>
+    <path
+       sodipodi:type="arc"
+       style="color:#000000;fill:#ff0000;fill-opacity:1;fill-rule:nonzero;stroke:#ffffff;stroke-width:5;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
+       id="path3778"
+       sodipodi:cx="452.54834"
+       sodipodi:cy="296.15222"
+       sodipodi:rx="88.893425"
+       sodipodi:ry="76.771591"
+       d="m 541.44176,296.15222 a 88.893425,76.771591 0 1 1 -177.78685,0 88.893425,76.771591 0 1 1 177.78685,0 z"
+       transform="matrix(1.091899,0,0,1.2643041,-94.13708,437.93571)" />
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer2"
+     inkscape:label="Original Size"
+     sodipodi:insensitive="true">
+    <rect
+       style="color:#000000;fill:none;stroke:#00ffff;stroke-width:1;stroke-miterlimit:4;stroke-dasharray:none;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
+       id="rect3752"
+       width="799"
+       height="479"
+       x="0.5"
+       y="0.5" />
+    <text
+       xml:space="preserve"
+       style="font-size:24px;font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;line-height:125%;letter-spacing:0.09px;word-spacing:0px;fill:#00ffff;fill-opacity:1;stroke:none;font-family:Liberation Sans;-inkscape-font-specification:Liberation Sans Bold"
+       x="124.24876"
+       y="390.09644"
+       id="text3756"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan3758"
+         x="124.24876"
+         y="390.09644">Original Size: 800x480 (aspect ratio 5:3)</tspan></text>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer3"
+     inkscape:label="Zoom 1: H Scale"
+     sodipodi:insensitive="true">
+    <rect
+       style="color:#000000;fill:none;stroke:#ffff00;stroke-width:1;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
+       id="rect3762"
+       width="589"
+       height="479"
+       x="105.5"
+       y="0.5"
+       inkscape:export-xdpi="90"
+       inkscape:export-ydpi="90" />
+    <text
+       xml:space="preserve"
+       style="font-size:24px;font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;line-height:125%;letter-spacing:0.09px;word-spacing:0px;fill:#ffff00;fill-opacity:1;stroke:none;font-family:Liberation Sans;-inkscape-font-specification:Liberation Sans Bold"
+       x="124.5183"
+       y="419.9223"
+       id="text3768"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan3770"
+         x="124.5183"
+         y="419.9223">Zoom 1 (H scale): 590x480</tspan></text>
+  </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer4"
+     inkscape:label="Zoom 2: H/V Scale"
+     style="display:inline"
+     sodipodi:insensitive="true">
+    <rect
+       style="color:#000000;fill:none;stroke:#ff00ff;stroke-width:1;stroke-miterlimit:4;stroke-dasharray:none;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate"
+       id="rect3772"
+       width="799"
+       height="459"
+       x="0.5"
+       y="10.5" />
+    <text
+       xml:space="preserve"
+       style="font-size:24px;font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;line-height:125%;letter-spacing:0.09px;word-spacing:0px;fill:#ff00ff;fill-opacity:1;stroke:none;font-family:Liberation Sans;-inkscape-font-specification:Liberation Sans Bold"
+       x="124.5183"
+       y="449.69543"
+       id="text3774"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan3776"
+         x="124.5183"
+         y="449.69543">Zoom 2 (H/V Scale): 800x460</tspan></text>
+  </g>
+</svg>