Panda3D
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texturePeeker.h
00001 // Filename: texturePeeker.h
00002 // Created by:  drose (26Aug08)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef TEXTUREPEEKER_H
00016 #define TEXTUREPEEKER_H
00017 
00018 #include "pandabase.h"
00019 
00020 #include "referenceCount.h"
00021 #include "texture.h"
00022 
00023 ////////////////////////////////////////////////////////////////////
00024 //       Class : TexturePeeker
00025 // Description : An instance of this object is returned by
00026 //               Texture::peek().  This object allows quick and easy
00027 //               inspection of a texture's texels by (u, v)
00028 //               coordinates.
00029 ////////////////////////////////////////////////////////////////////
00030 class EXPCL_PANDA_GOBJ TexturePeeker : public ReferenceCount {
00031 private:
00032   TexturePeeker(Texture *tex, Texture::CData *cdata);
00033 
00034 public:
00035   INLINE bool is_valid() const;
00036 
00037 PUBLISHED:
00038   INLINE int get_x_size() const;
00039   INLINE int get_y_size() const;
00040   INLINE int get_z_size() const;
00041 
00042   void lookup(LColor &color, PN_stdfloat u, PN_stdfloat v) const;
00043   void lookup(LColor &color, PN_stdfloat u, PN_stdfloat v, PN_stdfloat w) const;
00044   void filter_rect(LColor &color, 
00045                    PN_stdfloat min_u, PN_stdfloat min_v, 
00046                    PN_stdfloat max_u, PN_stdfloat max_v) const;
00047   void filter_rect(LColor &color, 
00048                    PN_stdfloat min_u, PN_stdfloat min_v, PN_stdfloat min_w,
00049                    PN_stdfloat max_u, PN_stdfloat max_v, PN_stdfloat max_w) const;
00050 
00051 private:
00052   static void init_rect_minmax(int &min_x, int &max_x, 
00053                                PN_stdfloat &min_u, PN_stdfloat &max_u,
00054                                int x_size);
00055 
00056   void accum_filter_z(LColor &color, PN_stdfloat &net,
00057                       int min_x, int max_x, PN_stdfloat min_u, PN_stdfloat max_u,
00058                       int min_y, int max_y, PN_stdfloat min_v, PN_stdfloat max_v,
00059                       int min_z, int max_z, PN_stdfloat min_w, PN_stdfloat max_w) const;
00060   void accum_filter_y(LColor &color, PN_stdfloat &net, int zi,
00061                       int min_x, int max_x, PN_stdfloat min_u, PN_stdfloat max_u,
00062                       int min_y, int max_y, PN_stdfloat min_v, PN_stdfloat max_v,
00063                       PN_stdfloat weight) const;
00064   void accum_filter_x(LColor &color, PN_stdfloat &net, int yi, int zi,
00065                       int min_x, int max_x, PN_stdfloat min_u, PN_stdfloat max_u,
00066                       PN_stdfloat weight) const;
00067   void accum_texel(LColor &color, PN_stdfloat &net, const unsigned char *&p, 
00068                    PN_stdfloat weight) const;
00069 
00070   typedef double GetComponentFunc(const unsigned char *&p);
00071   typedef void GetTexelFunc(LColor &color, const unsigned char *&p,
00072                             GetComponentFunc *get_component);
00073 
00074   static void get_texel_r(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00075   static void get_texel_g(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00076   static void get_texel_b(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00077   static void get_texel_a(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00078   static void get_texel_l(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00079   static void get_texel_la(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00080   static void get_texel_rgb(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00081   static void get_texel_rgba(LColor &color, const unsigned char *&p, GetComponentFunc *get_component);
00082   
00083   int _x_size;
00084   int _y_size;
00085   int _z_size;
00086   int _component_width;
00087   int _num_components;
00088   int _pixel_width;
00089   Texture::Format _format;
00090   Texture::ComponentType _component_type;
00091   CPTA_uchar _image;
00092 
00093   GetComponentFunc *_get_component;
00094   GetTexelFunc *_get_texel;
00095 
00096   friend class Texture;
00097 };
00098 
00099 #include "texturePeeker.I"
00100 
00101 #endif
00102 
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