Merge pull request #556 from treeform/svg_xml_node

Fix parseSvg function to accept XmlNode as root parameter

Author: treeform

src/pixie/fileformats/svg.nim

@@ -500,11 +500,10 @@ proc parseSvgElement(
     raise newException(PixieError, "Unsupported SVG tag: " & node.tag)
 
 proc parseSvg*(
-  data: string | XmlNode, width = 0, height = 0
+  root: XmlNode, width = 0, height = 0
 ): Svg {.raises: [PixieError].} =
   ## Parse SVG XML. Defaults to the SVG's view box size.
   try:
-    let root = parseXml(data)
     if root.tag != "svg":
       failInvalid()
 
@@ -521,7 +520,7 @@ proc parseSvg*(
 
     if viewBoxMinX != 0 or viewBoxMinY != 0:
       let viewBoxMin = vec2(-viewBoxMinX.float32, -viewBoxMinY.float32)
-      rootprops.transform = rootprops.transform * translate(viewBoxMin)
+      rootProps.transform = rootProps.transform * translate(viewBoxMin)
 
     result = Svg()
 
@@ -535,7 +534,7 @@ proc parseSvg*(
       let
         scaleX = width.float32 / viewBoxWidth.float32
         scaleY = height.float32 / viewBoxHeight.float32
-      rootprops.transform = rootprops.transform * scale(vec2(scaleX, scaleY))
+      rootProps.transform = rootProps.transform * scale(vec2(scaleX, scaleY))
 
     var propertiesStack = @[rootProps]
     for node in root.items:
@@ -545,6 +544,16 @@ proc parseSvg*(
   except:
     raise currentExceptionAsPixieError()
 
+proc parseSvg*(data: string, width = 0, height = 0): Svg {.raises: [PixieError].} =
+  ## Parse SVG data. Defaults to the SVG's view box size.
+  try:
+    let root = parseXml(data)
+    result = root.parseSvg(width, height)
+  except PixieError as e:
+    raise e
+  except:
+    raise currentExceptionAsPixieError()
+
 proc newImage*(svg: Svg): Image {.raises: [PixieError].} =
   ## Render SVG and return the image.
   result = newImage(svg.width, svg.height)

tests/test_svg.nim

@@ -1,4 +1,4 @@
-import pixie, pixie/fileformats/svg, strformat, xrays
+import pixie, pixie/fileformats/svg, strformat, xrays, xmlparser, xmltree
 
 const files = [
   "line01",
@@ -29,3 +29,12 @@ block:
     )
     image = newImage(svg)
   image.xray(&"tests/fileformats/svg/masters/accessibility-outline.png")
+
+block:
+  # Test using XML node by itself, see: https://github.com/treeform/pixie/pull/533
+  let
+    xmlNode = parseXml(readFile("tests/fileformats/svg/accessibility-outline.svg"))
+    svg = parseSvg(
+      xmlNode,
+      512, 512
+    )