1 files changed, 399 insertions, 0 deletions
diff --git a/im/src/lua5/imlua_palette.c b/im/src/lua5/imlua_palette.c
new file mode 100755
index 0000000..80d23eb
--- /dev/null
+++ b/im/src/lua5/imlua_palette.c
@@ -0,0 +1,399 @@
+/** \file
+ * \brief IM Lua 5 Binding
+ *
+ * See Copyright Notice in im_lib.h
+ * $Id: imlua_palette.c,v 1.1 2008/10/17 06:16:32 scuri Exp $
+ */
+
+#include <string.h>
+#include <memory.h>
+#include <stdlib.h>
+
+#include "im.h"
+#include "im_image.h"
+#include "im_util.h"
+#include "im_palette.h"
+
+#include <lua.h>
+#include <lauxlib.h>
+
+#include "imlua.h"
+#include "imlua_aux.h"
+#include "imlua_palette.h"
+
+
+static imluaPalette* imlua_rawcheckpalette(lua_State *L, int param)
+{
+  void *p = lua_touserdata(L, param);
+  if (p != NULL) {  /* value is a userdata? */
+    if (lua_getmetatable(L, param)) {  /* does it have a metatable? */
+      lua_getfield(L, LUA_REGISTRYINDEX, "imPalette");  /* get correct metatable */
+      if (lua_rawequal(L, -1, -2)) {  /* does it have the correct mt? */
+        lua_pop(L, 2);  /* remove both metatables */
+        return (imluaPalette*)p;
+      }
+      lua_pop(L, 1);  /* remove previous metatable */
+
+      /* check also for CD palette */
+      lua_getfield(L, LUA_REGISTRYINDEX, "cdPalette");  /* get correct metatable */
+      if (lua_rawequal(L, -1, -2)) {  /* does it have the correct mt? */
+        lua_pop(L, 2);  /* remove both metatables */
+        return (imluaPalette*)p;
+      }
+    }
+  }
+  luaL_typerror(L, param, "imPalette");  /* else error */
+  return NULL;  /* to avoid warnings */
+}
+
+imluaPalette* imlua_checkpalette (lua_State *L, int param)
+{
+  imluaPalette* pal = imlua_rawcheckpalette(L, param);
+  if (!pal->color)
+    luaL_argerror(L, param, "destroyed imPalette");
+
+  return pal;
+}
+
+void imlua_pushpalette(lua_State *L, long* color, int count)
+{
+  imluaPalette *pal = (imluaPalette*) lua_newuserdata(L, sizeof(imluaPalette));
+  pal->count = count;
+  pal->color = color;
+  luaL_getmetatable(L, "imPalette");
+  lua_setmetatable(L, -2);
+}
+
+/***************************************************************************\
+* Creates a palette as a "imPalette" userdata. A palette can be          *
+* considered and treated as a color table.                                 *
+* im.PaletteCreate(count: number) -> (palette: "imPalette")               *
+\***************************************************************************/
+static int imluaPaletteCreate(lua_State *L)
+{
+  long* color;
+
+  int count = luaL_optint(L, 1, 256);
+  if (count < 1 || count > 256)
+    luaL_argerror(L, 1, "palette count should be a positive integer and less then 256");
+
+  color = (long*)malloc(256*sizeof(long));
+  memset(color, 0, 256*sizeof(long));
+
+  imlua_pushpalette(L, color, count);
+  return 1;
+}
+
+
+/*****************************************************************************\
+ im.PaletteFindNearest
+\*****************************************************************************/
+static int imluaPaletteFindNearest (lua_State *L)
+{
+  imluaPalette *pal = imlua_checkpalette(L, 1);
+  long color = (long int) lua_touserdata(L, 1);
+
+  lua_pushnumber(L, imPaletteFindNearest(pal->color, pal->count, color));
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteFindColor
+\*****************************************************************************/
+static int imluaPaletteFindColor (lua_State *L)
+{
+  imluaPalette *pal = imlua_checkpalette(L, 1);
+  long color = (long) lua_touserdata(L, 2);
+  unsigned char tol = (unsigned char)luaL_checkint(L, 3);
+
+  lua_pushnumber(L, imPaletteFindColor(pal->color, pal->count, color, tol));
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteGray
+\*****************************************************************************/
+static int imluaPaletteGray (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteGray(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteRed
+\*****************************************************************************/
+static int imluaPaletteRed (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteRed(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteGreen
+\*****************************************************************************/
+static int imluaPaletteGreen (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteGreen(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteBlue
+\*****************************************************************************/
+static int imluaPaletteBlue (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteBlue(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteYellow
+\*****************************************************************************/
+static int imluaPaletteYellow (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteYellow(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteMagenta
+\*****************************************************************************/
+static int imluaPaletteMagenta (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteMagenta(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteCian
+\*****************************************************************************/
+static int imluaPaletteCian (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteCian(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteRainbow
+\*****************************************************************************/
+static int imluaPaletteRainbow (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteRainbow(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteHues
+\*****************************************************************************/
+static int imluaPaletteHues (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteHues(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteBlueIce
+\*****************************************************************************/
+static int imluaPaletteBlueIce (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteBlueIce(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteHotIron
+\*****************************************************************************/
+static int imluaPaletteHotIron (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteHotIron(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteBlackBody
+\*****************************************************************************/
+static int imluaPaletteBlackBody (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteBlackBody(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteHighContrast
+\*****************************************************************************/
+static int imluaPaletteHighContrast (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteHighContrast(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteUniform
+\*****************************************************************************/
+static int imluaPaletteUniform (lua_State *L)
+{
+  imlua_pushpalette(L, imPaletteUniform(), 256);
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteUniformIndex
+\*****************************************************************************/
+static int imluaPaletteUniformIndex (lua_State *L)
+{
+  lua_pushnumber(L, imPaletteUniformIndex((long int) lua_touserdata(L, 1)));
+  return 1;
+}
+
+/*****************************************************************************\
+ im.PaletteUniformIndexHalftoned
+\*****************************************************************************/
+static int imluaPaletteUniformIndexHalftoned (lua_State *L)
+{
+  long color = (long) lua_touserdata(L, 1);
+  int x = luaL_checkint(L, 2);
+  int y = luaL_checkint(L, 3);
+
+  lua_pushnumber(L, imPaletteUniformIndexHalftoned(color, x, y));
+  return 1;
+}
+
+/***************************************************************************\
+* Frees a previously allocated palette                                      *
+* im.PaletteDestroy(palette: "imPalette")                                      *
+\***************************************************************************/
+static int imluaPaletteDestroy (lua_State *L)
+{
+  imluaPalette *pal = imlua_rawcheckpalette(L, 1);
+  if (!pal->color)
+    luaL_argerror(L, 1, "destroyed imPalette");
+
+  free(pal->color);
+  pal->color = NULL;  /* mark as destroyed */
+  pal->count = 0;
+
+  return 0;
+}
+
+/*****************************************************************************\
+ gc
+\*****************************************************************************/
+static int imluaPalette_gc(lua_State *L)
+{
+  imluaPalette *pal = (imluaPalette*)lua_touserdata(L, 1);
+  if (pal && pal->color)
+  {
+    free(pal->color);
+    pal->color = NULL;  /* mark as destroyed */
+    pal->count = 0;
+  }
+
+  return 0;
+}
+
+/***************************************************************************\
+* color = palette[i]                                                        *
+\***************************************************************************/
+static int imluaPalette_index(lua_State *L)
+{
+  imluaPalette *pal = imlua_checkpalette(L, 1);
+  int index_i = luaL_checkint(L, 2);
+
+  if (index_i < 0 || index_i >= pal->count)
+    luaL_argerror(L, 2, "index is out of bounds");
+
+  lua_pushlightuserdata(L, (void*) pal->color[index_i]);
+  return 1;
+}
+
+/***************************************************************************\
+* palette[i] = color                                                        *
+\***************************************************************************/
+static int imluaPalette_newindex(lua_State *L)
+{
+  long color_i;
+  imluaPalette *pal = imlua_checkpalette(L, 1);
+  int index_i = luaL_checkint(L, 2);
+
+  if (index_i < 0 || index_i >= pal->count)
+    luaL_argerror(L, 2, "index is out of bounds");
+
+  if (!lua_islightuserdata(L, 3))
+    luaL_argerror(L, 3, "color must be a light user data");
+
+  color_i = (long int) lua_touserdata(L, 3);
+
+  pal->color[index_i] = color_i;
+  return 0;
+}
+
+/*****************************************************************************\
+ len
+\*****************************************************************************/
+static int imluaPalette_len(lua_State *L)
+{
+  imluaPalette *pal = (imluaPalette*)lua_touserdata(L, 1);
+  lua_pushinteger(L, pal->count);
+  return 1;
+}
+
+/*****************************************************************************\
+ tostring
+\*****************************************************************************/
+static int imluaPalette_tostring (lua_State *L)
+{
+  imluaPalette *pal = (imluaPalette*)lua_touserdata(L, 1);
+  lua_pushfstring(L, "imPalette(%p)%s", pal, (pal->color)? "": "-destroyed");
+  return 1;
+}
+
+static const luaL_reg impalette_lib[] = {
+  {"PaletteFindNearest", imluaPaletteFindNearest},
+  {"PaletteFindColor", imluaPaletteFindColor},
+  {"PaletteGray", imluaPaletteGray },
+  {"PaletteRed", imluaPaletteRed },
+  {"PaletteGreen", imluaPaletteGreen },
+  {"PaletteBlue", imluaPaletteBlue },
+  {"PaletteYellow", imluaPaletteYellow },
+  {"PaletteMagenta", imluaPaletteMagenta },
+  {"PaletteCian", imluaPaletteCian },
+  {"PaletteRainbow", imluaPaletteRainbow },
+  {"PaletteHues", imluaPaletteHues },
+  {"PaletteBlueIce", imluaPaletteBlueIce },
+  {"PaletteHotIron", imluaPaletteHotIron },
+  {"PaletteBlackBody", imluaPaletteBlackBody },
+  {"PaletteHighContrast", imluaPaletteHighContrast },
+  {"PaletteUniform", imluaPaletteUniform },
+  {"PaletteUniformIndex", imluaPaletteUniformIndex },
+  {"PaletteUniformIndexHalftoned", imluaPaletteUniformIndexHalftoned },
+
+  {"PaletteDestroy", imluaPaletteDestroy},
+  {"PaletteCreate", imluaPaletteCreate},
+
+  {NULL, NULL}
+};
+
+static const luaL_reg impalette_metalib[] = {
+  {"__gc", imluaPalette_gc},
+  {"__tostring", imluaPalette_tostring},
+  {"__index", imluaPalette_index},
+  {"__newindex", imluaPalette_newindex},
+  {"__len", imluaPalette_len},
+
+  {NULL, NULL}
+};
+
+static void createmeta (lua_State *L) 
+{
+  /* there is no object orientation for imPalette, only array access */
+  luaL_newmetatable(L, "imPalette");  /* create new metatable for imPalette handles */
+  luaL_register(L, NULL, impalette_metalib);     /* register methods */
+  lua_pop(L, 1);   /* removes the metatable from the top of the stack */
+}
+
+void imlua_open_palette (lua_State *L)
+{
+  /* "im" table is at the top of the stack */
+  createmeta(L);
+  luaL_register(L, NULL, impalette_lib);
+}