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-- EFL LuaJIT bindings: Eina (rectangle module)
-- For use with Elua
local ffi = require("ffi")
local C = ffi.C
ffi.cdef [[
typedef struct _Eina_Rectangle {
int x, y, w, h;
} Eina_Rectangle;
typedef struct _Eina_Rectangle_Pool Eina_Rectangle_Pool;
typedef unsigned char Eina_Bool;
Eina_Rectangle_Pool *eina_rectangle_pool_new(int w, int h);
Eina_Rectangle_Pool *eina_rectangle_pool_get(Eina_Rectangle *rect);
Eina_Bool eina_rectangle_pool_geometry_get(Eina_Rectangle_Pool *pool, int *w, int *h);
void *eina_rectangle_pool_data_get(Eina_Rectangle_Pool *pool);
void eina_rectangle_pool_data_set(Eina_Rectangle_Pool *pool, const void *data);
void eina_rectangle_pool_free(Eina_Rectangle_Pool *pool);
int eina_rectangle_pool_count(Eina_Rectangle_Pool *pool);
Eina_Rectangle *eina_rectangle_pool_request(Eina_Rectangle_Pool *pool, int w, int h);
void eina_rectangle_pool_release(Eina_Rectangle *rect);
Eina_Rectangle *eina_rectangle_new (int x, int y, int w, int h);
void eina_rectangle_free(Eina_Rectangle *rect);
]]
local cutil = require("cutil")
local util = require("util")
local M = {}
local eina
local init = function()
eina = util.lib_load("eina")
end
local shutdown = function()
util.lib_unload("eina")
end
cutil.init_module(init, shutdown)
local spans_intersect = function(c1, l1, c2, l2)
return not (((c2 + l2) <= c1) or (c2 >= (c1 + l1)))
end
M.spans_intersect = spans_intersect
M.Rectangle = ffi.metatype("Eina_Rectangle", {
__new = function(self, x, y, w, h)
return ffi.gc(eina.eina_rectangle_new(x, y, w, h), self.free)
end,
__index = {
free = function(self) eina.eina_rectangle_free(ffi.gc(self, nil)) end,
get_pool = function(self)
local v = eina.eina_rectangle_pool_get(self)
return v ~= nil and v or nil
end,
is_empty = function(self)
return (self.w < 1) or (self.h < 1)
end,
coords_from = function(self, x, y, w, h)
self.x, self.y, self.w, self.h = x, y, w, h
end,
intersects = function(self, other)
return spans_intersect(self.x, self.w, other.x, other.w)
and spans_interscet(self.y, self.h, other.y, other.h)
end,
xcoord_inside = function(self, x)
return ((x >= self.x) and (x < (self.x + self.w)))
end,
ycoord_inside = function(self, y)
return ((y >= self.y) and (y < (self.y + self.h)))
end,
coords_inside = function(self, x, y)
return self:xcoord_inside(x) and self:ycoord_inside(y)
end,
union = function(dst, src)
if dst.x > src.x then
dst.w = dst.w + dst.x - src.x
dst.x = src.x
end
if (dst.x + dst.w) < (src.x + src.w) then
dst.w = src.x + src.w - dst.x
end
if dst.y > src.y then
dst.h = dst.h + dst.y - src.y
dst.y = src.y
end
if (dst.y + dst.h) < (src.y + src.h) then
dst.h = src.y + src.h - dst.y
end
end,
intersection = function(dst, src)
if not dst:intersects(src) then
return false
end
if dst.x < src.x then
dst.w = dst.w + dst.x - src.x
dst.x = src.x
if dst.w < 0 then dst.w = 0 end
end
if (dst.x + dst.w) > (src.x + src.w) then
dst.w = src.x + src.w - dst.x
end
if dst.y < src.y then
dst.h = dst.h + dst.y - src.y
dst.y = src.y
if dst.h < 0 then dst.h = 0 end
end
if (dst.y + dst.h) > (src.y + src.h) then
dst.h = src.y + src.h - dst.y
end
return true
end,
rescale_in = function(self, inr, outr)
self.x = inr.x - outr.x
self.y = inr.y - outr.y
self.w = inr.w
self.h = inr.h
end,
rescale_out = function(self, inr, outr)
self.x = outr.x + inr.x
self.y = outr.y + inr.y
self.w = outr.w
self.h = outr.h
end,
is_valid = function(self)
return self.w > 0 and self.h > 0
end,
max_x = function(self) return self.x + self.w end,
max_y = function(self) return self.y + self.h end,
x_cut = function(self, slice, leftover, amount)
if amount > self.w then return false end
if slice then
slice:coords_from(self.x, self.y, amount, self.h)
end
if leftover then
leftover:coords_from(self.x + amount, self.y,
self.w - amount, self.h)
end
return true
end,
y_cut = function(self, slice, leftover, amount)
if amount > self.h then return false end
if slice then
slice:coords_from(self.x, self.y, self.w, amount)
end
if leftover then
leftover:coords_from(self.x, self.y + amount,
self.w, self.h - amount)
end
return true
end,
width_cut = function(self, slice, leftover, amount)
if (self.w - amount) < 0 then return false end
if slice then
slice:coords_from(self.x + (self.w - amount), self.y,
amount, self.h)
end
if leftover then
leftover:coords_from(self.x, self.y, self.w - amount, self.h)
end
return true
end,
height_cut = function(self, slice, leftover, amount)
if (self.h - amount) < 0 then return false end
if slice then
slice:coords_from(self.x, self.y + (self.h - amount),
self.w, amount)
end
if leftover then
leftover:coords_from(self.x, self.y, self.w, self.h - amount)
end
return true
end,
subtract = function(self, other)
if not self:is_valid() then return false end
local o1, o2, o3, o4 = ffi.new("Eina_Rectangle"),
ffi.new("Eina_Rectangle"),
ffi.new("Eina_Rectangle"),
ffi.new("Eina_Rectangle")
local intersection = ffi.new("Eina_Rectangle", self)
if not intersection:intersection(other) then
o1:coords_from(self)
return true, o1, o2, o3, o4
end
local leftover = ffi.new("Eina_Rectangle")
local cut = self.h - (intersection.y - self.y)
if cut > self.h then cut = self.h end
self:height_cut(self, leftover, o1, cut)
local tmp = ffi.new("Eina_Rectangle", leftover)
if tmp:intersection(intersection) then
cut = leftover.h - (leftover:max_y() - tmp:max_y())
if cut > leftover.h then cut = leftover.h end
leftover:y_cut(leftover, o2, cut)
end
local tmp = ffi.new("Eina_Rectangle", leftover)
if tmp:intersection(intersection) then
cut = leftover.w - (tmp.x - leftover.x)
if cut > leftover.w then cut = leftover.w end
leftover:width_cut(leftover, o3, cut)
end
local tmp = ffi.new("Eina_Rectangle", leftover)
if tmp:intersection(intersection) then
cut = leftover.w - (leftover:max_x() - tmp:max_x())
if cut > leftover.w then cut = leftover.w end
leftover:x_cut(leftover, o4, cut)
end
return true, o1, o2, o3, o4
end
}
})
M.Rectangle_Pool = ffi.metatype("Eina_Rectangle_Pool", {
__new = function(self, w, h)
return ffi.gc(eina.eina_rectangle_pool_new(w, h), self.free)
end,
__len = function(self) return eina.eina_rectangle_pool_count(self) end,
__index = {
free = function(self)
eina.eina_rectangle_pool_free(ffi.gc(self, nil))
end,
get = function(rect) return rect:get_pool() end,
geometry_get = function(self)
local w, h = ffi.new("int[1]"), ffi.new("int[1]")
eina.eina_rectangle_pool_geometry_get(self, w, h)
return w[0], h[0]
end,
--[[
data_get = function(self)
return eina.eina_rectangle_pool_data_get(self)
end,
data_set = function(self, v)
eina.eina_rectangle_pool_data_set(self, v)
end,
]]
request = function(self, w, h)
local v = eina.eina_rectangle_pool_request(self, w, h)
return v ~= nil and v or nil
end,
release = function(self, rect)
eina.eina_rectangle_pool_release(rect)
end
}
})
return M
|
