GLImageStructure readImage(const std::string& FileName, ImageType type_hint)
{
if (type_hint==itUnknown)
{
type_hint = getImageType(FileName);
}
switch (type_hint)
{
case itJPEG:
return readJPEG(FileName);
case itPNG:
return readPNG(FileName);
case itGIF:
return readGIF(FileName);
case itBitmap:
return readBMP(FileName);
case itPPM:
return readPPM(FileName);
}
//no supported image here
GLImageStructure temp_glis;
temp_glis.setWidth(0);
temp_glis.setHeight(0);
temp_glis.setFormat(0);
temp_glis.setBuffer(NULL);
return temp_glis;
}
SbBool ReadGIFImage(const SoInput& in, int &w, int &h, int &nc,
unsigned char *&bytes) {
int ncolors;
int bgIndex;
int errCode;
XColor *colors = (XColor*) malloc(GIF_MAXCOLORMAPSIZE * sizeof(XColor));
FILE *fp = in.getCurFile();
fseek(fp, 0, SEEK_SET);
if (fp == NULL) return FALSE;
unsigned char *array = readGIF(fp,
&w, &h, colors, &ncolors, &bgIndex, &errCode);
if (errCode != GIF_NO_ERROR) {
free(colors);
return FALSE;
}
nc = 3;
// convert color map image to rgb
// gif files go top down and we need bottom up. Switch it.
bytes = new unsigned char[w*h*nc];
int i, j;
for (j = 0; j < h; ++j)
for (i = 0; i < w; ++i) {
int c = array[j*w+i];
int index = ((h-j-1)*w+i)*nc;
if (c < 0 || c >= ncolors)
// store black if out of range
bytes[index] = bytes[index+1] = bytes[index+2] = 0;
else {
bytes[index] = colors[c].red / 256;
bytes[index+1] = colors[c].green / 256;
bytes[index+2] = colors[c].blue / 256;
}
}
free(colors);
free(array);
return TRUE;
}
