Remove cairo dependencywip-nocairo

We initially used Cairo for its bezier flattening algorithm. That
algorithm turned out to be a bit too imprecise at the scales we're
working at here (#17), so I ended up porting over some code from
Antigrain Graphics. The only other thing we used Cairo for was debug
output and coordinate transforms, so I just wrote the relevant vector
math in a small header file, deleted all debug output code and thus
eliminated the cairo dependency. This is a step towards Windows builds.

1 files changed, 6 insertions, 3 deletions

diff --git a/svg-flatten/src/svg_pattern.h b/svg-flatten/src/svg_pattern.h
index e6a6fe2..56444dd 100644
--- a/svg-flatten/src/svg_pattern.h
+++ b/svg-flatten/src/svg_pattern.h
@@ -19,10 +19,12 @@
 #pragma once
 
 #include <string>
-#include <cairo.h>
+
 #include <pugixml.hpp>
 #include <clipper.hpp>
+
 #include "svg_import_util.h"
+#include "geom2d.hpp"
 
 namespace gerbolyze {
 
@@ -34,13 +36,14 @@ public:
     Pattern() {}
     Pattern(const pugi::xml_node &node, SVGDocument &doc);
 
-    void tile (const gerbolyze::RenderSettings &rset, ClipperLib::Paths &clip);
+    void tile (xform2d &mat, const gerbolyze::RenderSettings &rset, ClipperLib::Paths &clip);
 
 private:
     double x, y, w, h;
     double vb_x, vb_y, vb_w, vb_h;
     bool has_vb;
-    std::string patternTransform;
+    xform2d patternTransform;
+    xform2d patternTransform_inv;
     enum RelativeUnits patternUnits;
     enum RelativeUnits patternContentUnits;
     const pugi::xml_node _node;