src/lua/gui-circle.cpp

   1 #include "lua/internal.hpp"
   2 #include "library/framebuffer.hpp"
   3 #include "library/range.hpp"
   4 #include "library/lua-framebuffer.hpp"
   5
   6 namespace
   7 {
   8         struct render_object_circle : public framebuffer::object
   9         {
  10                 render_object_circle(int32_t _x, int32_t _y, uint32_t _radius,
  11                         framebuffer::color _outline, framebuffer::color _fill, uint32_t _thickness) throw()
  12                         : x(_x), y(_y), outline(_outline), fill(_fill)
  13                         {
  14                                 radius = _radius;
  15                                 radius2 = static_cast<uint64_t>(_radius) * _radius;
  16                                 if(_thickness > _radius)
  17                                         iradius2 = 0;
  18                                 else
  19                                         iradius2 = static_cast<uint64_t>(_radius - _thickness) *
  20                                                 (_radius - _thickness);
  21                         }
  22                 ~render_object_circle() throw() {}
  23                 template<bool X> void op(struct framebuffer::fb<X>& scr) throw()
  24                 {
  25                         uint32_t oX = x + scr.get_origin_x();
  26                         uint32_t oY = y + scr.get_origin_y();
  27                         range bX = (range::make_w(scr.get_width()) - oX) & range::make_b(-radius, radius + 1);
  28                         range bY = (range::make_w(scr.get_height()) - oY) & range::make_b(-radius, radius + 1);
  29                         for(uint32_t r = bY.low(); r != bY.high(); r++) {
  30                                 uint64_t pd2 = static_cast<int64_t>(r) * r;
  31                                 typename framebuffer::fb<X>::element_t* rptr = scr.rowptr(oY + r);
  32                                 size_t eptr = oX + bX.low();
  33                                 for(uint32_t c = bX.low(); c != bX.high(); c++, eptr++) {
  34                                         uint64_t fd2 = pd2 + static_cast<int64_t>(c) * c;
  35                                         if(fd2 > radius2)
  36                                                 continue;
  37                                         else if(fd2 >= iradius2)
  38                                                 outline.apply(rptr[eptr]);
  39                                         else
  40                                                 fill.apply(rptr[eptr]);
  41                                 }
  42                         }
  43                 }
  44                 void operator()(struct framebuffer::fb<true>& scr) throw()  { op(scr); }
  45                 void operator()(struct framebuffer::fb<false>& scr) throw() { op(scr); }
  46                 void clone(framebuffer::queue& q) const throw(std::bad_alloc) { q.clone_helper(this); }
  47         private:
  48                 int32_t x;
  49                 int32_t y;
  50                 int32_t radius;
  51                 uint64_t radius2;
  52                 uint64_t iradius2;
  53                 framebuffer::color outline;
  54                 framebuffer::color fill;
  55         };
  56
  57         int circle(lua::state& L, lua::parameters& P)
  58         {
  59                 int32_t x, y;
  60                 uint32_t radius, thickness;
  61                 framebuffer::color poutline, pfill;
  62
  63                 if(!lua_render_ctx) return 0;
  64
  65                 P(x, y, radius, P.optional(thickness, 1), P.optional(poutline, 0xFFFFFFU), P.optional(pfill, -1));
  66
  67                 lua_render_ctx->queue->create_add<render_object_circle>(x, y, radius, poutline, pfill, thickness);
  68                 return 0;
  69         }
  70
  71         lua::functions circle_fns(lua_func_misc, "gui", {
  72                 {"circle", circle},
  73         });
  74 }