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, 8 deletions

diff --git a/svg-flatten/src/svg_geom.h b/svg-flatten/src/svg_geom.h
index 5f00479..1e9f5cd 100644
--- a/svg-flatten/src/svg_geom.h
+++ b/svg-flatten/src/svg_geom.h
@@ -18,19 +18,17 @@
 
 #pragma once
 
-#include <cairo.h>
 #include <clipper.hpp>
 #include <pugixml.hpp>
 
 namespace gerbolyze {
 
-ClipperLib::IntRect get_paths_bounds(const ClipperLib::Paths &paths);
-enum ClipperLib::PolyFillType clipper_fill_rule(const pugi::xml_node &node);
-enum ClipperLib::EndType clipper_end_type(const pugi::xml_node &node);
-enum ClipperLib::JoinType clipper_join_type(const pugi::xml_node &node);
-void dehole_polytree(ClipperLib::PolyTree &ptree, ClipperLib::Paths &out);
-void combine_clip_paths(ClipperLib::Paths &in_a, ClipperLib::Paths &in_b, ClipperLib::Paths &out);
-void transform_paths(cairo_t *cr, ClipperLib::Paths &paths, cairo_matrix_t *mat=nullptr);
+    ClipperLib::IntRect get_paths_bounds(const ClipperLib::Paths &paths);
+    enum ClipperLib::PolyFillType clipper_fill_rule(const pugi::xml_node &node);
+    enum ClipperLib::EndType clipper_end_type(const pugi::xml_node &node);
+    enum ClipperLib::JoinType clipper_join_type(const pugi::xml_node &node);
+    void dehole_polytree(ClipperLib::PolyTree &ptree, ClipperLib::Paths &out);
+    void combine_clip_paths(ClipperLib::Paths &in_a, ClipperLib::Paths &in_b, ClipperLib::Paths &out);
 
 } /* namespace gerbolyze */