[SVGDom] Add support for assorted absolute units

experimental/svg/model/SkSVGRenderContext.cpp

Index: experimental/svg/model/SkSVGRenderContext.cpp
diff --git a/experimental/svg/model/SkSVGRenderContext.cpp b/experimental/svg/model/SkSVGRenderContext.cpp
index 8ad881429a21b906a3041a06753bb5b045c61757..1ce21e4a9bd759cd2a95dd8ef0b82f6e8b7e112a 100644
--- a/experimental/svg/model/SkSVGRenderContext.cpp
+++ b/experimental/svg/model/SkSVGRenderContext.cpp
@@ -26,16 +26,34 @@ SkScalar length_size_for_type(const SkSize& viewport, SkSVGLengthContext::Length
     return 0;
 }
 

[robertphillips, 2016/08/17 18:39:03]

// These all assume a 90dpi display device.

Do we not want to actually have an fDPI setting on SkSVGLengthContext and then
compute all these explicitly in resolve ?

[f(malita), 2016/08/17 21:04:17]

Done.

+// https://www.w3.org/TR/SVG/coords.html#Units
+constexpr SkScalar kPXMultiplier =  1.00f;

[robertphillips, 2016/08/17 18:39:03]

Isn't the pt multiplier supposed to be DPI/72.272 ?

[f(malita), 2016/08/17 21:04:17]

Done.

+constexpr SkScalar kPTMultiplier =  1.25f;
+constexpr SkScalar kPCMultiplier = 15.00f;
+constexpr SkScalar kINMultiplier = 90.00f;
+constexpr SkScalar kMMMultiplier =  3.543307f;
+constexpr SkScalar kCMMultiplier = kMMMultiplier * 10;
+
 } // anonymous ns
 
 SkScalar SkSVGLengthContext::resolve(const SkSVGLength& l, LengthType t) const {
     switch (l.unit()) {
     case SkSVGLength::Unit::kNumber:
-        // Fall through.
-    case SkSVGLength::Unit::kPX:
         return l.value();
     case SkSVGLength::Unit::kPercentage:
         return l.value() * length_size_for_type(fViewport, t) / 100;
+    case SkSVGLength::Unit::kPX:
+        return l.value() * kPXMultiplier;
+    case SkSVGLength::Unit::kCM:
+        return l.value() * kCMMultiplier;
+    case SkSVGLength::Unit::kMM:
+        return l.value() * kMMMultiplier;
+    case SkSVGLength::Unit::kIN:
+        return l.value() * kINMultiplier;
+    case SkSVGLength::Unit::kPT:
+        return l.value() * kPTMultiplier;
+    case SkSVGLength::Unit::kPC:
+        return l.value() * kPCMultiplier;
     default:
         SkDebugf("unsupported unit type: <%d>\n", l.unit());
         return 0;