Fix SVG scaling (bug#59802)

Fix SVG scaling with librsvg>2.52 and SVG file with only one known
dimension.

* src/image.c (svg_load_image): Compute a percentage dimension with
the other known dimension.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/image.c b/src/image.c
index 2436f78ac38..b881e43e951 100644
--- a/src/image.c
+++ b/src/image.c
@@ -11309,6 +11309,15 @@ svg_load_image (struct frame *f, struct image *img, char *contents,
                                                     img->face_font_size);
           viewbox_height = svg_css_length_to_pixels (iheight, dpi,
                                                      img->face_font_size);
+
+          /* Here one dimension could be zero because in percent unit.
+             So calculate this dimension with the other.  */
+          if (! (0 < viewbox_width) && (iwidth.unit == RSVG_UNIT_PERCENT))
+            viewbox_width = (viewbox_height * viewbox.width / viewbox.height)
+              * iwidth.length;
+          else if (! (0 < viewbox_height) && (iheight.unit == RSVG_UNIT_PERCENT))
+            viewbox_height = (viewbox_width * viewbox.height / viewbox.width)
+              * iheight.length;
         }
       else if (has_width && has_viewbox)
         {