gusucode.com > VC++ 图像处理类库CxImage源代码-源码程序 > VC++ 图像处理类库CxImage源代码-源码程序/code/cximage_src/CxImage/ximajbg.cpp
//Download by http://www.NewXing.com /* * File: ximajbg.cpp * Purpose: Platform Independent JBG Image Class Loader and Writer * 18/Aug/2002 Davide Pizzolato - www.xdp.it * CxImage version 6.0.0 02/Feb/2008 */ #include "ximajbg.h" #if CXIMAGE_SUPPORT_JBG #include "ximaiter.h" #define JBIG_BUFSIZE 8192 //////////////////////////////////////////////////////////////////////////////// #if CXIMAGE_SUPPORT_DECODE //////////////////////////////////////////////////////////////////////////////// bool CxImageJBG::Decode(CxFile *hFile) { if (hFile == NULL) return false; struct jbg_dec_state jbig_state; unsigned long xmax = 4294967295UL, ymax = 4294967295UL; unsigned int len, cnt; BYTE *buffer,*p; int result; cx_try { jbg_dec_init(&jbig_state); jbg_dec_maxsize(&jbig_state, xmax, ymax); buffer = (BYTE*)malloc(JBIG_BUFSIZE); if (!buffer) cx_throw("Sorry, not enough memory available!"); result = JBG_EAGAIN; do { len = hFile->Read(buffer, 1, JBIG_BUFSIZE); if (!len) break; cnt = 0; p = buffer; while (len > 0 && (result == JBG_EAGAIN || result == JBG_EOK)) { result = jbg_dec_in(&jbig_state, p, len, &cnt); p += cnt; len -= cnt; } } while (result == JBG_EAGAIN || result == JBG_EOK); if (hFile->Error()) cx_throw("Problem while reading input file"); if (result != JBG_EOK && result != JBG_EOK_INTR) cx_throw("Problem with input file"); int w, h, bpp, planes, ew; w = jbg_dec_getwidth(&jbig_state); h = jbg_dec_getheight(&jbig_state); planes = jbg_dec_getplanes(&jbig_state); bpp = (planes+7)>>3; ew = (w + 7)>>3; if (info.nEscape == -1){ head.biWidth = w; head.biHeight= h; info.dwType = CXIMAGE_FORMAT_JBG; cx_throw("output dimensions returned"); } switch (planes){ case 1: { BYTE* binary_image = jbg_dec_getimage(&jbig_state, 0); if (!Create(w,h,1,CXIMAGE_FORMAT_JBG)) cx_throw(""); SetPaletteColor(0,255,255,255); SetPaletteColor(1,0,0,0); CImageIterator iter(this); iter.Upset(); for (int i=0;i<h;i++){ iter.SetRow(binary_image+i*ew,ew); iter.PrevRow(); } break; } default: cx_throw("cannot decode images with more than 1 plane"); } jbg_dec_free(&jbig_state); free(buffer); } cx_catch { jbg_dec_free(&jbig_state); if (buffer) free(buffer); if (strcmp(message,"")) strncpy(info.szLastError,message,255); if (info.nEscape == -1 && info.dwType == CXIMAGE_FORMAT_JBG) return true; return false; } return true; } //////////////////////////////////////////////////////////////////////////////// #endif //CXIMAGE_SUPPORT_DECODE //////////////////////////////////////////////////////////////////////////////// bool CxImageJBG::Encode(CxFile * hFile) { if (EncodeSafeCheck(hFile)) return false; if (head.biBitCount != 1){ strcpy(info.szLastError,"JBG can save only 1-bpp images"); return false; } int w, h, bpp, planes, ew, i, j, x, y; w = head.biWidth; h = head.biHeight; planes = 1; bpp = (planes+7)>>3; ew = (w + 7)>>3; BYTE mask; RGBQUAD *rgb = GetPalette(); if (CompareColors(&rgb[0],&rgb[1])<0) mask=255; else mask=0; BYTE *buffer = (BYTE*)malloc(ew*h*2); if (!buffer) { strcpy(info.szLastError,"Sorry, not enough memory available!"); return false; } for (y=0; y<h; y++){ i= y*ew; j= (h-y-1)*info.dwEffWidth; for (x=0; x<ew; x++){ buffer[i + x]=info.pImage[j + x]^mask; } } struct jbg_enc_state jbig_state; jbg_enc_init(&jbig_state, w, h, planes, &buffer, jbig_data_out, hFile); //jbg_enc_layers(&jbig_state, 2); //jbg_enc_lrlmax(&jbig_state, 800, 600); // Specify a few other options (each is ignored if negative) int dl = -1, dh = -1, d = -1, l0 = -1, mx = -1; int options = JBG_TPDON | JBG_TPBON | JBG_DPON; int order = JBG_ILEAVE | JBG_SMID; jbg_enc_lrange(&jbig_state, dl, dh); jbg_enc_options(&jbig_state, order, options, l0, mx, -1); // now encode everything and send it to data_out() jbg_enc_out(&jbig_state); // give encoder a chance to free its temporary data structures jbg_enc_free(&jbig_state); free(buffer); if (hFile->Error()){ strcpy(info.szLastError,"Problem while writing JBG file"); return false; } return true; } //////////////////////////////////////////////////////////////////////////////// #endif // CXIMAGE_SUPPORT_JBG