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/*
* File: ximajbg.cpp
* Purpose: Platform Independent JBG Image Class Loader and Writer
* 18/Aug/2002 Davide Pizzolato - www.xdp.it
* CxImage version 7.0.0 31/Dec/2010
*/
#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;
uint32_t xmax = 4294967295UL, ymax = 4294967295UL;
uint32_t len, cnt;
uint8_t *buffer=0,*p;
int32_t result;
cx_try
{
jbg_dec_init(&jbig_state);
jbg_dec_maxsize(&jbig_state, xmax, ymax);
buffer = (uint8_t*)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");
int32_t 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:
{
uint8_t* 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 (int32_t 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;
}
int32_t 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;
uint8_t mask;
RGBQUAD *rgb = GetPalette();
if (CompareColors(&rgb[0],&rgb[1])<0) mask=255; else mask=0;
uint8_t *buffer = (uint8_t*)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)
int32_t dl = -1, dh = -1, d = -1, l0 = -1, mx = -1;
int32_t options = JBG_TPDON | JBG_TPBON | JBG_DPON;
int32_t 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
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