quiet some compiler warnings

src/draw.cpp

@@ -186,7 +186,7 @@ void GraphicsWindow::MakeSelected(Selection *stog) {
     if(stog->entity.v != 0 && SK.GetEntity(stog->entity)->IsFace()) {
         // In the interest of speed for the triangle drawing code,
         // only MAX_SELECTABLE_FACES faces may be selected at a time.
-        int c = 0;
+        unsigned int c = 0;
         Selection *s;
         selection.ClearTags();
         for(s = selection.First(); s; s = selection.NextAfter(s)) {

src/mouse.cpp

@@ -824,7 +824,7 @@ Vector GraphicsWindow::SnapToEntityByScreenPoint(Point2d pp, hEntity he) {
     SEdgeList *edges = e->GetOrGenerateEdges();
 
     double minD = -1.0f;
-    double k;
+    double k = 0.0;
     const SEdge *edge = NULL;
     for(const auto &e : edges->l) {
         Point2d p0 = ProjectPoint(e.a);

src/resource.cpp

@@ -273,8 +273,8 @@ std::shared_ptr<Pixmap> Pixmap::ReadPng(const Platform::Path &filename, bool fli
 }
 
 bool Pixmap::WritePng(FILE *f, bool flip) {
-    int colorType = 0;
-    bool bgr = false;
+    colorType = 0;
+    bgr = false;
     switch(format) {
         case Format::RGBA: colorType = PNG_COLOR_TYPE_RGBA; bgr = false; break;
         case Format::BGRA: colorType = PNG_COLOR_TYPE_RGBA; bgr = true;  break;

src/resource.h

@@ -38,6 +38,8 @@ public:
     size_t                     height;
     size_t                     stride;
     std::vector<uint8_t>       data;
+    int colorType;
+    bool bgr;
 
     static std::shared_ptr<Pixmap> Create(Format format, size_t width, size_t height);
     static std::shared_ptr<Pixmap> FromPng(const uint8_t *data, size_t size, bool flip = false);