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