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Replace the few fixed width box blurs with a single variable width one.

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Originally committed to SVN as r1479.
This commit is contained in:
Niels Martin Hansen 2007-08-12 23:19:43 +00:00
parent da8c8abc7d
commit c55dea23aa
1 changed files with 8 additions and 6 deletions
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14
OverLua/raster_ops.cpp
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@ -326,16 +326,18 @@ static int gaussian_blur(lua_State *L)
// n tap box blur // n tap box blur
template <size_t taps, int tapval>
static int box_blur(lua_State *L) static int box_blur(lua_State *L)
{ {
LuaCairoSurface *surfobj = LuaCairoSurface::GetObjPointer(L, 1); LuaCairoSurface *surfobj = LuaCairoSurface::GetObjPointer(L, 1);
int width = luaL_checkint(L, 1);
if (width <= 0) { luaL_error(L, "Width of box kernel for raster.box must be larger than zero, specified to %d.", width); return 0; }
int applications = luaL_optint(L, 1, 1); int applications = luaL_optint(L, 1, 1);
int kernel[taps]; int *kernel = new int[width];
for (size_t i = 0; i < taps; i++) for (int i = 0; i < width; i++)
kernel[i] = tapval; kernel[i] = 1;
while (applications-- > 0) while (applications-- > 0)
ApplySeparableFilter(L, surfobj->GetSurface(), kernel, taps, 255); ApplySeparableFilter(L, surfobj->GetSurface(), kernel, width, width);
delete[] kernel;
return 0; return 0;
} }
@ -380,7 +382,7 @@ static int invert_image(lua_State *L)
static luaL_Reg rasterlib[] = { static luaL_Reg rasterlib[] = {
{"gaussian_blur", gaussian_blur}, {"gaussian_blur", gaussian_blur},
{"box3", box_blur<3,85>}, {"box5", box_blur<5,51>}, {"box15", box_blur<15,17>}, {"box", box_blur},
{NULL, NULL} {NULL, NULL}
}; };