int
s_image_read_line(s_image * image,
int line,
unsigned char * buf)
{
if (image->data) {
int bpr = image->width*image->components;
memcpy(buf, image->data + bpr*line, bpr);
return 1;
}
else if (image->opendata && image->openfuncs.read_line_func) {
int ret = image->openfuncs.read_line_func(image->opendata, line, buf);
/* for some file formats, the line read order can be important when
fetching data from the file. If read-line fails, fall back to
reading the entire image */
if (!ret && image->oktoreadall && image->openfilename) {
/* close old image handle first */
image->openfuncs.close_func(image->opendata);
image->opendata = NULL;
/* just load everything and call function again to read line */
image->data = simage_read_image(image->openfilename,
&image->width,
&image->height,
&image->components);
if (image->data) {
return s_image_read_line(image, line, buf);
}
}
return ret;
}
return 0;
}
GLubyte*
glmReadSimage(const char* filename, GLboolean alpha, int* w, int* h, int* type)
{
int numcomponents;
GLubyte *buffer = simage_read_image(filename, w, h, &numcomponents);
switch(numcomponents) {
case 1:
*type = GL_LUMINANCE;
break;
case 2:
*type = GL_LUMINANCE_ALPHA;
break;
case 3:
*type = GL_RGB;
break;
case 4:
*type = GL_RGBA;
break;
}
return buffer;
}