utilities/CxImage/ximawbmp.cpp

   1 /*\r
   2  * File:        ximawbmp.cpp\r
   3  * Purpose:     Platform Independent WBMP Image Class Loader and Writer\r
   4  * 12/Jul/2002 Davide Pizzolato - www.xdp.it\r
   5  * CxImage version 6.0.0 02/Feb/2008\r
   6  */\r
   7 \r
   8 #include "ximawbmp.h"\r
   9 \r
  10 #if CXIMAGE_SUPPORT_WBMP\r
  11 \r
  12 #include "ximaiter.h"\r
  13 \r
  14 ////////////////////////////////////////////////////////////////////////////////\r
  15 #if CXIMAGE_SUPPORT_DECODE\r
  16 ////////////////////////////////////////////////////////////////////////////////\r
  17 bool CxImageWBMP::Decode(CxFile *hFile)\r
  18 {\r
  19         if (hFile == NULL) return false;\r
  20 \r
  21         WBMPHEADER wbmpHead;\r
  22 \r
  23   cx_try\r
  24   {\r
  25         ReadOctet(hFile, &wbmpHead.Type);\r
  26 \r
  27         DWORD dat;\r
  28         ReadOctet(hFile, &dat);\r
  29         wbmpHead.FixHeader = (BYTE)dat;\r
  30 \r
  31         ReadOctet(hFile, &wbmpHead.ImageWidth);\r
  32         ReadOctet(hFile, &wbmpHead.ImageHeight);\r
  33 \r
  34         if (hFile->Eof())\r
  35                 cx_throw("Not a WBMP");\r
  36 \r
  37         if (wbmpHead.Type != 0)\r
  38                 cx_throw("Unsupported WBMP type");                      \r
  39 \r
  40         head.biWidth = wbmpHead.ImageWidth;\r
  41         head.biHeight= wbmpHead.ImageHeight;\r
  42 \r
  43         if (head.biWidth<=0 || head.biHeight<=0)\r
  44                 cx_throw("Corrupted WBMP");\r
  45 \r
  46         if (info.nEscape == -1){\r
  47                 info.dwType = CXIMAGE_FORMAT_WBMP;\r
  48                 return true;\r
  49         }\r
  50 \r
  51         Create(head.biWidth, head.biHeight, 1, CXIMAGE_FORMAT_WBMP);\r
  52         if (!IsValid()) cx_throw("WBMP Create failed");\r
  53         SetGrayPalette();\r
  54 \r
  55         int linewidth=(head.biWidth+7)/8;\r
  56     CImageIterator iter(this);\r
  57         iter.Upset();\r
  58     for (long y=0; y < head.biHeight; y++){\r
  59                 hFile->Read(iter.GetRow(),linewidth,1);\r
  60                 iter.PrevRow();\r
  61     }\r
  62 \r
  63   } cx_catch {\r
  64         if (strcmp(message,"")) strncpy(info.szLastError,message,255);\r
  65         return FALSE;\r
  66   }\r
  67     return true;\r
  68 }\r
  69 ////////////////////////////////////////////////////////////////////////////////\r
  70 bool CxImageWBMP::ReadOctet(CxFile * hFile, DWORD *data)\r
  71 {\r
  72         BYTE c;\r
  73         *data = 0;\r
  74         do {\r
  75                 if (hFile->Eof()) return false;\r
  76                 c = (BYTE)hFile->GetC();\r
  77                 *data <<= 7;\r
  78                 *data |= (c & 0x7F);\r
  79         } while ((c&0x80)!=0);\r
  80         return true;\r
  81 }\r
  82 ////////////////////////////////////////////////////////////////////////////////\r
  83 #endif //CXIMAGE_SUPPORT_DECODE\r
  84 ////////////////////////////////////////////////////////////////////////////////\r
  85 #if CXIMAGE_SUPPORT_ENCODE\r
  86 ////////////////////////////////////////////////////////////////////////////////\r
  87 bool CxImageWBMP::Encode(CxFile * hFile)\r
  88 {\r
  89         if (EncodeSafeCheck(hFile)) return false;\r
  90 \r
  91         //check format limits\r
  92         if (head.biBitCount!=1){\r
  93                 strcpy(info.szLastError,"Can't save this image as WBMP");\r
  94                 return false;\r
  95         }\r
  96 \r
  97         WBMPHEADER wbmpHead;\r
  98         wbmpHead.Type=0;\r
  99         wbmpHead.FixHeader=0;\r
 100         wbmpHead.ImageWidth=head.biWidth;\r
 101         wbmpHead.ImageHeight=head.biHeight;\r
 102 \r
 103     // Write the file header\r
 104         hFile->PutC('\0');\r
 105         hFile->PutC('\0');\r
 106         WriteOctet(hFile,wbmpHead.ImageWidth);\r
 107         WriteOctet(hFile,wbmpHead.ImageHeight);\r
 108     // Write the pixels\r
 109         int linewidth=(wbmpHead.ImageWidth+7)/8;\r
 110     CImageIterator iter(this);\r
 111         iter.Upset();\r
 112     for (DWORD y=0; y < wbmpHead.ImageHeight; y++){\r
 113                 hFile->Write(iter.GetRow(),linewidth,1);\r
 114                 iter.PrevRow();\r
 115     }\r
 116         return true;\r
 117 }\r
 118 ////////////////////////////////////////////////////////////////////////////////\r
 119 bool CxImageWBMP::WriteOctet(CxFile * hFile, const DWORD data)\r
 120 {\r
 121         int ns = 0;\r
 122         while (data>>(ns+7)) ns+=7;\r
 123         while (ns>0){\r
 124                 if (!hFile->PutC(0x80 | (BYTE)(data>>ns))) return false;\r
 125                 ns-=7;\r
 126         }\r
 127         if (!(hFile->PutC((BYTE)(0x7F & data)))) return false;\r
 128         return true;\r
 129 }\r
 130 ////////////////////////////////////////////////////////////////////////////////\r
 131 #endif // CXIMAGE_SUPPORT_ENCODE\r
 132 ////////////////////////////////////////////////////////////////////////////////\r
 133 #endif // CXIMAGE_SUPPORT_WBMP\r
 134 \r