int ppm_parser(char *buf,
size_t len,
struct fb_image *image,
struct format *output_format)
{
int color_bytes = 0;
size_t i = 0;
size_t j = 0;
size_t size = 0;
char red, green, blue;
unsigned short *out = NULL;
if (NULL == (buf = ppm_header(buf, len, image, &color_bytes)))
return VMM_EFAIL;
/* Overwritting in the correct format */
out = (unsigned short*)buf;
size = image->width * image->height;
image->depth = output_format->byte_size * 8;
for (i = 0; (i < size) && (j + 2 < len); ++i) {
red = buf[j + 2] >> (8 - output_format->red.length);
green = buf[j + 1] >> (8 - output_format->green.length);
blue = buf[j] >> (8 - output_format->blue.length);
out[i] = red << output_format->red.offset |
green << output_format->green.offset |
blue << output_format->blue.offset;
j += 3;
}
image->data = buf;
return VMM_OK;
}
static int
loadppm_from_file(FILE *rgb, FILE *alpha, struct ppm *ppm) {
ppm->buffer = NULL;
ppm->step = 0;
int rgb_id = 0;
int alpha_id = 0;
if (rgb) {
if (!ppm_header(rgb, ppm)) {
return 0;
}
rgb_id = ppm->type;
ppm->step += 3;
}
if (alpha) {
if (rgb == NULL) {
if (!ppm_header(alpha, ppm)) {
return 0;
}
} else {
struct ppm pgm;
if (!ppm_header(alpha, &pgm)) {
return 0;
}
if (ppm->depth != pgm.depth || ppm->width != pgm.width || ppm->height != pgm.height) {
return 0;
}
alpha_id = pgm.type;
}
ppm->step += 1;
}
ppm->buffer = (uint8_t *)malloc(ppm->height * ppm->width * ppm->step);
if (rgb) {
if (!ppm_data(ppm, rgb, rgb_id, 0))
return 0;
}
if (alpha) {
int skip = 0;
if (rgb) {
skip = 3;
}
if (!ppm_data(ppm, alpha, alpha_id, skip))
return 0;
}
return 1;
}
