static size_t rgb2ppm(ss_t **ppm, const ss_t *rgb, const struct RGB_Info *ri)
{
RETURN_IF(!ppm || !rgb || !valid_rgbi_for_ppm(ri), 0);
int colors_per_channel = (1 << (ri->bpp / ri->chn)) - 1;
ss_printf(ppm, 512, "P%i %i %i %i\n", (ri->chn == 1 ? 5 : 6),
(int)ri->width, (int)ri->height, colors_per_channel);
ss_cat(ppm, rgb);
return ss_size(*ppm);
}
ss_t *ss_cpy(ss_t **s, const ss_t *src)
{
ASSERT_RETURN_IF(!s, ss_void);
RETURN_IF(*s == src && ss_check(s), *s); /* aliasing, same string */
RETURN_IF(!src, ss_clear(s)); /* BEHAVIOR: empty */
if (*s)
ss_clear(s);
return ss_cat(s, src);
}
static size_t rgb2tga(ss_t **tga, const ss_t *rgb, const struct RGB_Info *ri)
{
RETURN_IF(!rgb || (!valid_rgbi(ri) && (ri->bpp / ri->chn) != 8), 0);
RETURN_IF(ri->chn != 1 && ri->chn != 3 && ri->chn != 4, 0);
size_t buf_size = ri->bmp_size + TGA_RGBHDR;
RETURN_IF(ss_reserve(tga, buf_size) < buf_size, 0);
char *h = ss_get_buffer(*tga);
memset(h, 0, TGA_RGBHDR);
h[TGA_ID] = TGA_NO_X_INFO;
h[TGA_CMAP] = TGA_NO_CMAP;
h[TGA_TYPE] = ri->chn == 1 ? TGA_RAW_GRAY : TGA_RAW_RGB;
S_ST_LE_U16(h + TGA_W, ri->width);
S_ST_LE_U16(h + TGA_H, ri->height);
h[TGA_BPP] = ri->bpp;
h[TGA_DESC] = TGA_TOP_LEFT;
ss_cpy_cn(tga, h, TGA_RGBHDR);
if (ri->chn == 1)
ss_cat(tga, rgb);
else
tga_rgb_swap(ri->bpp, ri->bmp_size, ss_get_buffer_r(rgb),
ss_get_buffer(*tga) + TGA_RGBHDR);
ss_set_size(*tga, buf_size);
return ss_size(*tga);
}
