/*
Returns NGRADSAMPLES samples of active gradient.
Each sample has (gimp_drawable_bpp (drawable_id)) bytes.
"ripped" from gradmap.c.
*/
static guchar *
get_gradient_samples (gint32 drawable_id,
gboolean reverse)
{
gchar *gradient_name;
gint n_f_samples;
gdouble *f_samples, *f_samp; /* float samples */
guchar *b_samples, *b_samp; /* byte samples */
gint bpp, color, has_alpha, alpha;
gint i, j;
gradient_name = gimp_context_get_gradient ();
gimp_gradient_get_uniform_samples (gradient_name, NGRADSAMPLES, reverse,
&n_f_samples, &f_samples);
g_free (gradient_name);
bpp = gimp_drawable_bpp (drawable_id);
color = gimp_drawable_is_rgb (drawable_id);
has_alpha = gimp_drawable_has_alpha (drawable_id);
alpha = (has_alpha ? bpp - 1 : bpp);
b_samples = g_new (guchar, NGRADSAMPLES * bpp);
for (i = 0; i < NGRADSAMPLES; i++)
{
b_samp = &b_samples[i * bpp];
f_samp = &f_samples[i * 4];
if (color)
for (j = 0; j < 3; j++)
b_samp[j] = f_samp[j] * 255;
else
b_samp[0] = GIMP_RGB_LUMINANCE (f_samp[0], f_samp[1], f_samp[2]) * 255;
if (has_alpha)
b_samp[alpha] = f_samp[3] * 255;
}
g_free (f_samples);
return b_samples;
}
/*
Returns 2048 samples of the gradient.
Each sample is (R'G'B'A float) or (Y'A float), depending on the drawable
*/
static gdouble *
get_samples_gradient (gint32 drawable_id)
{
gchar *gradient_name;
gint n_d_samples;
gdouble *d_samples = NULL;
gradient_name = gimp_context_get_gradient ();
/* FIXME: "reverse" hardcoded to FALSE. */
gimp_gradient_get_uniform_samples (gradient_name, NSAMPLES, FALSE,
&n_d_samples, &d_samples);
g_free (gradient_name);
if (!gimp_drawable_is_rgb (drawable_id))
{
const Babl *format_src = babl_format ("R'G'B'A double");
const Babl *format_dst = babl_format ("Y'A double");
const Babl *fish = babl_fish (format_src, format_dst);
babl_process (fish, d_samples, d_samples, NSAMPLES);
}
return d_samples;
}
