include/wx/mac/pngread.h

   1 /*
   2  * File:        pngread.h
   3  * Purpose:     PNG file reader
   4  * Author:      Alejandro Aguilar Sierra/Julian Smart
   5  * Created:     1995
   6  * Copyright:   (c) 1995, Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
   7  *
   8  *
   9  */
  10
  11 #ifndef _WX_PNGREAD__
  12 #define _WX_PNGREAD__
  13
  14 #ifdef __GNUG__
  15 #pragma interface "pngread.h"
  16 #endif
  17
  18 #ifndef byte
  19 typedef unsigned char byte;
  20 #endif
  21
  22 #define WXIMA_COLORS DIB_PAL_COLORS
  23
  24 typedef byte * ImagePointerType;
  25
  26 typedef struct
  27 {
  28         byte red;
  29         byte green;
  30    byte blue;
  31 } rgb_color_struct;
  32
  33
  34 #define COLORTYPE_PALETTE       1
  35 #define COLORTYPE_COLOR         2
  36 #define COLORTYPE_ALPHA         4
  37
  38 class wxPNGReader
  39 {
  40 protected:
  41   int filetype;
  42   char filename[255];
  43   ImagePointerType RawImage;    //  Image data
  44
  45   int Width, Height;            //  Dimensions
  46   int Depth;                    // (bits x pixel)
  47   int ColorType;                // Bit 1 = Palette used
  48                                 // Bit 2 = Color used
  49                                 // Bit 3 = Alpha used
  50
  51   long EfeWidth;                // Efective Width
  52
  53   GWorldPtr lpbi;
  54   int bgindex;
  55   wxPalette* m_palette;
  56   bool imageOK;
  57 friend class wxPNGReaderIter;
  58 public:
  59   wxPNGReader(void);
  60   wxPNGReader (char* ImageFileName);     // Read an image file
  61   virtual ~wxPNGReader ();
  62
  63   void Create(int width, int height, int deep, int colortype=-1);
  64
  65   bool ReadFile( char* ImageFileName=0 );
  66   bool SaveFile( char* ImageFileName=0 );
  67   bool SaveXPM(char *filename, char *name = 0);
  68   int  GetWidth( void ) const { return Width; };
  69   int  GetHeight( void ) const { return Height; };
  70   int  GetDepth( void ) const { return Depth; };
  71   int  GetColorType( void ) const { return ColorType; };
  72
  73   int  GetIndex(int x, int y);
  74   bool GetRGB(int x, int y, byte* r, byte* g, byte* b);
  75
  76   bool SetIndex(int x, int y, int index);
  77   bool SetRGB(int x, int y, byte r, byte g, byte b);
  78
  79   // ColorMap settings
  80   bool SetPalette(wxPalette* colourmap);
  81   bool SetPalette(int n, rgb_color_struct *rgb_struct);
  82   bool SetPalette(int n, byte *r, byte *g=0, byte *b=0);
  83   wxPalette* GetPalette() const { return m_palette; }
  84
  85   void NullData();
  86   inline int GetBGIndex(void) { return bgindex; }
  87
  88   inline bool Inside(int x, int y)
  89       { return (0<=y && y<Height && 0<=x && x<Width); }
  90
  91   virtual wxBitmap *GetBitmap(void);
  92   virtual bool InstantiateBitmap(wxBitmap *bitmap);
  93   wxMask *CreateMask(void);
  94
  95   inline bool Ok(void) { return imageOK; }
  96 };
  97
  98 class wxPNGReaderIter
  99 {
 100 protected:
 101   int Itx, Ity;                         // Counters
 102   int Stepx, Stepy;
 103   ImagePointerType IterImage;           //  Image pointer
 104   wxPNGReader *ima;
 105 public:
 106 // Constructors
 107   wxPNGReaderIter ( void );
 108   wxPNGReaderIter ( wxPNGReader *imax );
 109   operator wxPNGReader* ();
 110
 111 // Iterators
 112   bool ItOK ();
 113   void reset ();
 114   void upset ();
 115   void SetRow(byte *buf, int n);
 116   void GetRow(byte *buf, int n);
 117   byte GetByte( ) { return IterImage[Itx]; }
 118   void SetByte(byte b) { IterImage[Itx] = b; }
 119   ImagePointerType GetRow(void);
 120   bool NextRow();
 121   bool PrevRow();
 122   bool NextByte();
 123   bool PrevByte();
 124
 125   void SetSteps(int x, int y=0) {  Stepx = x; Stepy = y; }
 126   void GetSteps(int *x, int *y) {  *x = Stepx; *y = Stepy; }
 127   bool NextStep();
 128   bool PrevStep();
 129
 130 ////////////////////////// AD - for interlace ///////////////////////////////
 131   void SetY(int y);
 132 /////////////////////////////////////////////////////////////////////////////
 133 };
 134
 135
 136 inline
 137 wxPNGReaderIter::wxPNGReaderIter(void)
 138 {
 139   ima = 0;
 140   IterImage = 0;
 141   Itx = Ity = 0;
 142   Stepx = Stepy = 0;
 143 }
 144
 145 inline
 146 wxPNGReaderIter::wxPNGReaderIter(wxPNGReader *imax): ima(imax)
 147 {
 148   if (ima)
 149          IterImage = ima->RawImage;
 150   Itx = Ity = 0;
 151   Stepx = Stepy = 0;
 152 }
 153
 154 inline
 155 wxPNGReaderIter::operator wxPNGReader* ()
 156 {
 157   return ima;
 158 }
 159
 160 inline
 161 bool wxPNGReaderIter::ItOK ()
 162 {
 163   if (ima)
 164          return ima->Inside(Itx, Ity);
 165   else
 166          return FALSE;
 167 }
 168
 169
 170 inline void wxPNGReaderIter::reset()
 171 {
 172   IterImage = ima->RawImage;
 173   Itx = Ity = 0;
 174 }
 175
 176 inline void wxPNGReaderIter::upset()
 177 {
 178   Itx = 0;
 179   Ity = ima->Height-1;
 180   IterImage = ima->RawImage + ima->EfeWidth*(ima->Height-1);
 181 }
 182
 183 inline bool wxPNGReaderIter::NextRow()
 184 {
 185   if (++Ity >= ima->Height) return 0;
 186   IterImage += ima->EfeWidth;
 187   return 1;
 188 }
 189
 190 inline bool wxPNGReaderIter::PrevRow()
 191 {
 192   if (--Ity < 0) return 0;
 193   IterImage -= ima->EfeWidth;
 194   return 1;
 195 }
 196
 197 ////////////////////////// AD - for interlace ///////////////////////////////
 198 inline void wxPNGReaderIter::SetY(int y)
 199 {
 200   if ((y < 0) || (y > ima->Height)) return;
 201   Ity = y;
 202   IterImage = ima->RawImage + ima->EfeWidth*y;
 203 }
 204
 205 /////////////////////////////////////////////////////////////////////////////
 206
 207 inline void wxPNGReaderIter::SetRow(byte *buf, int n)
 208 {
 209 // Here should be bcopy or memcpy
 210   //_fmemcpy(IterImage, (void far *)buf, n);
 211   if (n<0)
 212          n = ima->GetWidth();
 213
 214   for (int i=0; i<n; i++) IterImage[i] = buf[i];
 215 }
 216
 217 inline void wxPNGReaderIter::GetRow(byte *buf, int n)
 218 {
 219   for (int i=0; i<n; i++) buf[i] = IterImage[i];
 220 }
 221
 222 inline ImagePointerType wxPNGReaderIter::GetRow()
 223 {
 224   return IterImage;
 225 }
 226
 227 inline bool wxPNGReaderIter::NextByte()
 228 {
 229   if (++Itx < ima->EfeWidth)
 230          return 1;
 231   else
 232          if (++Ity < ima->Height)
 233          {
 234                 IterImage += ima->EfeWidth;
 235                 Itx = 0;
 236                 return 1;
 237          } else
 238                 return 0;
 239 }
 240
 241 inline bool wxPNGReaderIter::PrevByte()
 242 {
 243   if (--Itx >= 0)
 244          return 1;
 245   else
 246          if (--Ity >= 0)
 247          {
 248                 IterImage -= ima->EfeWidth;
 249                 Itx = 0;
 250                 return 1;
 251          } else
 252                 return 0;
 253 }
 254
 255 inline bool wxPNGReaderIter::NextStep()
 256 {
 257   Itx += Stepx;
 258   if (Itx < ima->EfeWidth)
 259          return 1;
 260   else {
 261          Ity += Stepy;
 262          if (Ity < ima->Height)
 263          {
 264                 IterImage += ima->EfeWidth;
 265                 Itx = 0;
 266                 return 1;
 267          } else
 268                 return 0;
 269   }
 270 }
 271
 272 inline bool wxPNGReaderIter::PrevStep()
 273 {
 274   Itx -= Stepx;
 275   if (Itx >= 0)
 276          return 1;
 277   else {
 278          Ity -= Stepy;
 279          if (Ity >= 0 && Ity < ima->Height)
 280          {
 281                 IterImage -= ima->EfeWidth;
 282                 Itx = 0;
 283                 return 1;
 284          } else
 285                 return 0;
 286   }
 287 }
 288
 289 #endif
 290