include/wx/mac/carbon/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(void) { return imageOK; }
  92 };
  93
  94 class wxPNGReaderIter
  95 {
  96 protected:
  97   int Itx, Ity;                // Counters
  98   int Stepx, Stepy;
  99   ImagePointerType IterImage;          //  Image pointer
 100   wxPNGReader *ima;
 101 public:
 102 // Constructors
 103   wxPNGReaderIter ( void );
 104   wxPNGReaderIter ( wxPNGReader *imax );
 105   operator wxPNGReader* ();
 106
 107 // Iterators
 108   bool ItOK ();
 109   void reset ();
 110   void upset ();
 111   void SetRow(byte *buf, int n);
 112   void GetRow(byte *buf, int n);
 113   byte GetByte( ) { return IterImage[Itx]; }
 114   void SetByte(byte b) { IterImage[Itx] = b; }
 115   ImagePointerType GetRow(void);
 116   bool NextRow();
 117   bool PrevRow();
 118   bool NextByte();
 119   bool PrevByte();
 120
 121   void SetSteps(int x, int y=0) {  Stepx = x; Stepy = y; }
 122   void GetSteps(int *x, int *y) {  *x = Stepx; *y = Stepy; }
 123   bool NextStep();
 124   bool PrevStep();
 125
 126 ////////////////////////// AD - for interlace ///////////////////////////////
 127   void SetY(int y);
 128 /////////////////////////////////////////////////////////////////////////////
 129 };
 130
 131
 132 inline
 133 wxPNGReaderIter::wxPNGReaderIter(void)
 134 {
 135   ima = 0;
 136   IterImage = 0;
 137   Itx = Ity = 0;
 138   Stepx = Stepy = 0;
 139 }
 140
 141 inline
 142 wxPNGReaderIter::wxPNGReaderIter(wxPNGReader *imax): ima(imax)
 143 {
 144   if (ima)
 145      IterImage = ima->RawImage;
 146   Itx = Ity = 0;
 147   Stepx = Stepy = 0;
 148 }
 149
 150 inline
 151 wxPNGReaderIter::operator wxPNGReader* ()
 152 {
 153   return ima;
 154 }
 155
 156 inline
 157 bool wxPNGReaderIter::ItOK ()
 158 {
 159   if (ima)
 160      return ima->Inside(Itx, Ity);
 161   else
 162      return FALSE;
 163 }
 164
 165
 166 inline void wxPNGReaderIter::reset()
 167 {
 168   IterImage = ima->RawImage;
 169   Itx = Ity = 0;
 170 }
 171
 172 inline void wxPNGReaderIter::upset()
 173 {
 174   Itx = 0;
 175   Ity = ima->Height-1;
 176   IterImage = ima->RawImage + ima->EfeWidth*(ima->Height-1);
 177 }
 178
 179 inline bool wxPNGReaderIter::NextRow()
 180 {
 181   if (++Ity >= ima->Height) return 0;
 182   IterImage += ima->EfeWidth;
 183   return 1;
 184 }
 185
 186 inline bool wxPNGReaderIter::PrevRow()
 187 {
 188   if (--Ity < 0) return 0;
 189   IterImage -= ima->EfeWidth;
 190   return 1;
 191 }
 192
 193 ////////////////////////// AD - for interlace ///////////////////////////////
 194 inline void wxPNGReaderIter::SetY(int y)
 195 {
 196   if ((y < 0) || (y > ima->Height)) return;
 197   Ity = y;
 198   IterImage = ima->RawImage + ima->EfeWidth*y;
 199 }
 200
 201 /////////////////////////////////////////////////////////////////////////////
 202
 203 inline void wxPNGReaderIter::SetRow(byte *buf, int n)
 204 {
 205 // Here should be bcopy or memcpy
 206   //_fmemcpy(IterImage, (void far *)buf, n);
 207   if (n<0)
 208      n = ima->GetWidth();
 209
 210   for (int i=0; i<n; i++) IterImage[i] = buf[i];
 211 }
 212
 213 inline void wxPNGReaderIter::GetRow(byte *buf, int n)
 214 {
 215   for (int i=0; i<n; i++) buf[i] = IterImage[i];
 216 }
 217
 218 inline ImagePointerType wxPNGReaderIter::GetRow()
 219 {
 220   return IterImage;
 221 }
 222
 223 inline bool wxPNGReaderIter::NextByte()
 224 {
 225   if (++Itx < ima->EfeWidth)
 226      return 1;
 227   else
 228      if (++Ity < ima->Height)
 229      {
 230         IterImage += ima->EfeWidth;
 231         Itx = 0;
 232         return 1;
 233      } else
 234         return 0;
 235 }
 236
 237 inline bool wxPNGReaderIter::PrevByte()
 238 {
 239   if (--Itx >= 0)
 240      return 1;
 241   else
 242      if (--Ity >= 0)
 243      {
 244         IterImage -= ima->EfeWidth;
 245         Itx = 0;
 246         return 1;
 247      } else
 248         return 0;
 249 }
 250
 251 inline bool wxPNGReaderIter::NextStep()
 252 {
 253   Itx += Stepx;
 254   if (Itx < ima->EfeWidth)
 255      return 1;
 256   else {
 257      Ity += Stepy;
 258      if (Ity < ima->Height)
 259      {
 260         IterImage += ima->EfeWidth;
 261         Itx = 0;
 262         return 1;
 263      } else
 264         return 0;
 265   }
 266 }
 267
 268 inline bool wxPNGReaderIter::PrevStep()
 269 {
 270   Itx -= Stepx;
 271   if (Itx >= 0)
 272      return 1;
 273   else {
 274      Ity -= Stepy;
 275      if (Ity >= 0 && Ity < ima->Height)
 276      {
 277         IterImage -= ima->EfeWidth;
 278         Itx = 0;
 279         return 1;
 280      } else
 281         return 0;
 282   }
 283 }
 284
 285 #endif
 286