1 files changed, 98 insertions, 0 deletions
diff --git a/noatun-plugins/tippercanoe/polygon.h b/noatun-plugins/tippercanoe/polygon.h
new file mode 100644
index 0000000..f711c03
--- /dev/null
+++ b/noatun-plugins/tippercanoe/polygon.h
@@ -0,0 +1,98 @@
+#include <string.h>
+
+template<class Pixel>
+struct Bitmap {
+  int width, height, extra;
+  Pixel *data;
+
+  Bitmap(int e=0) : extra(e), data(0) { };
+  ~Bitmap() { delete[] data; };
+
+  void size(int w,int h) {
+    delete[] data;
+    width = w;
+    height = h;
+    data = new Pixel[w*h+extra];
+    clear();
+  }
+  
+  void clear() {
+    memset(data,0,sizeof(Pixel)*(width*height+extra));
+  }
+};
+
+template<class Pixel, class Combiner, int superSampleShift>
+struct PolygonEngine : public Bitmap<Pixel> {
+  PolygonEngine() : Bitmap<Pixel>(1) { }
+  
+#define super (1<<superSampleShift)
+  void apply(Pixel *dest) {
+    Pixel sum=0;
+    int count = this->width*this->height;
+    Pixel *src = this->data;
+    while(count--) {
+      sum += *(src++);
+      if (sum)
+        *dest = Combiner::combine(sum,*dest);
+      dest++;
+    }
+  }
+
+  void add(Pixel color,int x,int y) {
+    if (y < 0) return;
+    if (y >= this->height) return;
+    if (x < 0) x = 0;
+    if (x > this->width) x = this->width;
+    this->data[x+y*this->width] += color;
+  }
+
+  /* Color is char[layers] */
+
+  //  zwoosh, yknow, it goes... zwoosh an all these bars and lines and
+  //  crap intersect.
+  Pixel colorTable[2][super+1];
+  void pen(Pixel color) {
+    for(int i=0;i<super+1;i++) {
+      colorTable[0][i] = color*i;
+      colorTable[1][i] = -(color*i);
+    }
+  }
+  
+  void line(int x1,int y1,int x2,int y2) {
+    Pixel *colors;
+    if (y2 < y1) {
+      int temp;
+      temp = x2; x2 = x1; x1 = temp;
+      temp = y2; y2 = y1; y1 = temp;
+      colors = colorTable[1];
+    } else {
+      if (y1 == y2) return;
+    
+      colors= colorTable[0];
+    }
+
+    int slope = (x1-x2 << 16)/(y1-y2);
+    int x = x1<<16, y = y1;
+    while(y < y2) {
+      add(colors[super-((x>>16)&(super-1))],
+	  x>>(16+superSampleShift),y>>superSampleShift); 
+      add(colors[(x>>16)&(super-1)],
+	  1+(x>>(16+superSampleShift)),y>>superSampleShift); 
+      x += slope;
+      y++;
+    }
+  }
+
+  void icon(double icon[][4],Pixel color,double x,double y,
+            double scaleX, double scaleY) {
+    pen(color);
+    x *= super;
+    y *= super;
+    scaleX *= super;
+    scaleY *= super;
+    for(int i=0;icon[i][1] != icon[i][3];i++)
+      line(int(icon[i][0]*scaleX+x),int(icon[i][1]*scaleY+y),
+	   int(icon[i][2]*scaleX+x),int(icon[i][3]*scaleY+y));
+  }
+#undef super
+};