static int get_pix_fmt_score(enum AVPixelFormat dst_pix_fmt,
enum AVPixelFormat src_pix_fmt,
unsigned *lossp, unsigned consider)
{
const AVPixFmtDescriptor *src_desc = av_pix_fmt_desc_get(src_pix_fmt);
const AVPixFmtDescriptor *dst_desc = av_pix_fmt_desc_get(dst_pix_fmt);
int src_color, dst_color;
int src_min_depth, src_max_depth, dst_min_depth, dst_max_depth;
int ret, loss, i, nb_components;
int score = INT_MAX - 1;
if (dst_pix_fmt >= AV_PIX_FMT_NB || dst_pix_fmt <= AV_PIX_FMT_NONE)
return ~0;
/* compute loss */
*lossp = loss = 0;
if (dst_pix_fmt == src_pix_fmt)
return INT_MAX;
if ((ret = get_pix_fmt_depth(&src_min_depth, &src_max_depth, src_pix_fmt)) < 0)
return ret;
if ((ret = get_pix_fmt_depth(&dst_min_depth, &dst_max_depth, dst_pix_fmt)) < 0)
return ret;
src_color = get_color_type(src_desc);
dst_color = get_color_type(dst_desc);
nb_components = FFMIN(src_desc->nb_components, dst_desc->nb_components);
for (i = 0; i < nb_components; i++)
if (src_desc->comp[i].depth_minus1 > dst_desc->comp[i].depth_minus1 && (consider & FF_LOSS_DEPTH)) {
loss |= FF_LOSS_DEPTH;
score -= 65536 >> dst_desc->comp[i].depth_minus1;
}
void set_shift(byte gray_bits, byte alpha_bits = 0) const
{
TRACE_IO_TRANSFORM("png_set_shift: gray_bits=%d, alpha_bits=%d\n",
gray_bits, alpha_bits);
if (get_color_type() != color_type_gray
|| get_color_type() != color_type_gray_alpha)
{
throw error("set_shift: expected Gray or Gray+Alpha"
" color type");
}
color_info bits;
bits.gray = gray_bits;
bits.alpha = alpha_bits;
png_set_shift(m_png, & bits);
}
void set_shift(byte red_bits, byte green_bits, byte blue_bits,
byte alpha_bits = 0) const
{
TRACE_IO_TRANSFORM("png_set_shift: red_bits=%d, green_bits=%d,"
" blue_bits=%d, alpha_bits=%d\n",
red_bits, green_bits, blue_bits, alpha_bits);
if (get_color_type() != color_type_rgb
|| get_color_type() != color_type_rgb_alpha)
{
throw error("set_shift: expected RGB or RGBA color type");
}
color_info bits;
bits.red = red_bits;
bits.green = green_bits;
bits.blue = blue_bits;
bits.alpha = alpha_bits;
png_set_shift(m_png, & bits);
}
