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/*
* File: ximawbmp.cpp
* Purpose: Platform Independent WBMP Image Class Loader and Writer
* 12/Jul/2002 Davide Pizzolato - www.xdp.it
* CxImage version 7.0.0 31/Dec/2010
*/
#include "ximawbmp.h"
#if CXIMAGE_SUPPORT_WBMP
#include "ximaiter.h"
////////////////////////////////////////////////////////////////////////////////
#if CXIMAGE_SUPPORT_DECODE
////////////////////////////////////////////////////////////////////////////////
bool CxImageWBMP::Decode(CxFile *hFile)
{
if (hFile == NULL) return false;
WBMPHEADER wbmpHead;
cx_try
{
ReadOctet(hFile, &wbmpHead.Type);
uint32_t dat;
ReadOctet(hFile, &dat);
wbmpHead.FixHeader = (uint8_t)dat;
ReadOctet(hFile, &wbmpHead.ImageWidth);
ReadOctet(hFile, &wbmpHead.ImageHeight);
if (hFile->Eof())
cx_throw("Not a WBMP");
if (wbmpHead.Type != 0)
cx_throw("Unsupported WBMP type");
head.biWidth = wbmpHead.ImageWidth;
head.biHeight= wbmpHead.ImageHeight;
if (head.biWidth<=0 || head.biHeight<=0)
cx_throw("Corrupted WBMP");
if (info.nEscape == -1){
info.dwType = CXIMAGE_FORMAT_WBMP;
return true;
}
Create(head.biWidth, head.biHeight, 1, CXIMAGE_FORMAT_WBMP);
if (!IsValid()) cx_throw("WBMP Create failed");
SetGrayPalette();
int32_t linewidth=(head.biWidth+7)/8;
CImageIterator iter(this);
iter.Upset();
for (int32_t y=0; y < head.biHeight; y++){
hFile->Read(iter.GetRow(),linewidth,1);
iter.PrevRow();
}
} cx_catch {
if (strcmp(message,"")) strncpy(info.szLastError,message,255);
return FALSE;
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImageWBMP::ReadOctet(CxFile * hFile, uint32_t *data)
{
uint8_t c;
*data = 0;
do {
if (hFile->Eof()) return false;
c = (uint8_t)hFile->GetC();
*data <<= 7;
*data |= (c & 0x7F);
} while ((c&0x80)!=0);
return true;
}
////////////////////////////////////////////////////////////////////////////////
#endif //CXIMAGE_SUPPORT_DECODE
////////////////////////////////////////////////////////////////////////////////
#if CXIMAGE_SUPPORT_ENCODE
////////////////////////////////////////////////////////////////////////////////
bool CxImageWBMP::Encode(CxFile * hFile)
{
if (EncodeSafeCheck(hFile)) return false;
//check format limits
if (head.biBitCount!=1){
strcpy(info.szLastError,"Can't save this image as WBMP");
return false;
}
WBMPHEADER wbmpHead;
wbmpHead.Type=0;
wbmpHead.FixHeader=0;
wbmpHead.ImageWidth=head.biWidth;
wbmpHead.ImageHeight=head.biHeight;
// Write the file header
hFile->PutC('\0');
hFile->PutC('\0');
WriteOctet(hFile,wbmpHead.ImageWidth);
WriteOctet(hFile,wbmpHead.ImageHeight);
// Write the pixels
int32_t linewidth=(wbmpHead.ImageWidth+7)/8;
CImageIterator iter(this);
iter.Upset();
for (uint32_t y=0; y < wbmpHead.ImageHeight; y++){
hFile->Write(iter.GetRow(),linewidth,1);
iter.PrevRow();
}
return true;
}
////////////////////////////////////////////////////////////////////////////////
bool CxImageWBMP::WriteOctet(CxFile * hFile, const uint32_t data)
{
int32_t ns = 0;
while (data>>(ns+7)) ns+=7;
while (ns>0){
if (!hFile->PutC(0x80 | (uint8_t)(data>>ns))) return false;
ns-=7;
}
if (!(hFile->PutC((uint8_t)(0x7F & data)))) return false;
return true;
}
////////////////////////////////////////////////////////////////////////////////
#endif // CXIMAGE_SUPPORT_ENCODE
////////////////////////////////////////////////////////////////////////////////
#endif // CXIMAGE_SUPPORT_WBMP
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