static size_t tga2rgb(ss_t **rgb, struct RGB_Info *ri, const ss_t *tga)
{
const char *t = ss_get_buffer_r(tga);
const size_t ts = ss_size(tga);
RETURN_IF(ts < TGA_RGBHDR || !valid_tga(t), 0);
set_rgbi(ri, S_LD_LE_U16(t + TGA_W), S_LD_LE_U16(t + TGA_H),
t[TGA_BPP], t[TGA_TYPE] == TGA_RAW_GRAY ? 1 : t[TGA_BPP]/8);
RETURN_IF(!valid_rgbi(ri), 0);
size_t rgb_bytes = ri->row_size * ri->height;
RETURN_IF(ts < rgb_bytes + TGA_RGBHDR, 0);
RETURN_IF(ss_reserve(rgb, rgb_bytes) < rgb_bytes, 0);
if ((t[TGA_DESC] & TGA_TOP_LEFT) != 0) {
if (ri->chn == 1)
ss_cpy_cn(rgb, t + TGA_RGBHDR, rgb_bytes);
else
tga_rgb_swap(ri->bpp, rgb_bytes,
ss_get_buffer_r(tga) + TGA_RGBHDR,
ss_get_buffer(*rgb));
} else {
ss_set_size(*rgb, 0);
ssize_t i = (ssize_t)(ri->height - 1) * ri->row_size;
for (; i >= 0; i -= ri->row_size)
if (ri->chn == 1)
ss_cat_cn(rgb, t + TGA_RGBHDR + i,
ri->row_size);
else
tga_rgb_swap(ri->bpp, ri->row_size,
t + TGA_RGBHDR + i,
ss_get_buffer(*rgb) + i);
}
ss_set_size(*rgb, rgb_bytes);
return rgb_bytes;
}
ss_t *ss_cpy_cn(ss_t **s, const char *src, const size_t src_size)
{
ASSERT_RETURN_IF(!s, ss_void);
ASSERT_RETURN_IF(!src || !src_size, ss_clear(s)); /* BEHAVIOR: empty */
if (*s)
ss_clear(s);
ss_cat_cn(s, src, src_size);
return ss_check(s);
}
static void aux_png_write(png_structp s, png_bytep d, png_size_t ds)
{
ss_cat_cn((ss_t **)png_get_io_ptr(s), (char *)d, ds);
}