unitless image widths interpreted as pixels and converted

to inches, in generation of column layout

Author: gordonwoodhull

src/resources/filters/layout/width.lua

@@ -136,11 +136,15 @@ function widthsToFraction(layout, cols)
       widths[#widths+1] = 0
       local width = attribute(fig, "width", nil)
       if width then
+        local num = tonumber(width)
+        if num then
+          width = string.format("%.6f", num / PANDOC_WRITER_OPTIONS.dpi) .. "in"
+        end
         widths[#widths] = width
       end
     end
 
-    -- create virtual fig widths as needed and note the total width
+    -- default width
     local defaultWidth = "1fr"
     for i=1,cols do
       if (i > #widths) or widths[i] == 0 then
@@ -149,8 +153,7 @@ function widthsToFraction(layout, cols)
     end
     -- allocate widths
     for i,fig in ipairs(row) do
-      local width = widths[i];
-      fig.attr.attributes["width"] = width
+      fig.attr.attributes["width"] = widths[i]
       fig.attr.attributes["height"] = nil
     end
 

tests/docs/smoke-all/typst/layout/unitless-image-width.qmd

@@ -0,0 +1,32 @@
+---
+title: Unitless image widths in column layout
+format: typst
+keep-md: true
+keep-typ: true
+_quarto:
+  tests:
+    typst:
+      ensureTypstFileRegexMatches:
+        -
+          ['#grid\((\r\n?|\n)columns: \(1fr, 1fr, 1.041667in, 1fr, 0.260417in\), gutter: 1em, rows: 1,']
+
+---
+
+::: {.callout-note}
+
+## Plots
+
+::: {layout-ncol=5}
+
+![]({{< placeholder format=svg >}})
+
+![]({{< placeholder format=svg >}})
+
+![]({{< placeholder format=svg >}}){width=100}
+
+![]({{< placeholder format=svg >}})
+
+![]({{< placeholder format=svg >}}){width=25}
+
+:::
+:::