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app: add offset support to shaped gradients

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In gimp:gradient, handle the "offset" property in shaped gradients.

(cherry picked from commit 6bd5deea89)
This commit is contained in:
Ell
2019-09-22 21:57:30 +03:00
parent 7c51194cc1
commit b7f1b1fbe9
1 changed files with 36 additions and 0 deletions
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36
app/operations/gimpoperationgradient.c
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@ -139,12 +139,15 @@ static gdouble gradient_calc_spiral_factor (gdouble
gboolean clockwise);
static gdouble gradient_calc_shapeburst_angular_factor (GeglSampler *dist_sampler,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_shapeburst_spherical_factor (GeglSampler *dist_sampler,
gdouble offset,
gdouble x,
gdouble y);
static gdouble gradient_calc_shapeburst_dimpled_factor (GeglSampler *dist_sampler,
gdouble offset,
gdouble x,
gdouble y);
@ -797,28 +800,48 @@ gradient_calc_spiral_factor (gdouble dist,
static gdouble
gradient_calc_shapeburst_angular_factor (GeglSampler *dist_sampler,
gdouble offset,
gdouble x,
gdouble y)
{
gfloat value;
offset = offset / 100.0;
gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
value = 1.0 - value;
if (value < offset)
value = 0.0;
else if (offset == 1.0)
value = (value >= 1.0) ? 1.0 : 0.0;
else
value = (value - offset) / (1.0 - offset);
return value;
}
static gdouble
gradient_calc_shapeburst_spherical_factor (GeglSampler *dist_sampler,
gdouble offset,
gdouble x,
gdouble y)
{
gfloat value;
offset = 1.0 - offset / 100.0;
gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
if (value > offset)
value = 1.0;
else if (offset == 0.0)
value = (value <= 0.0) ? 0.0 : 1.0;
else
value = value / offset;
value = 1.0 - sin (0.5 * G_PI * value);
return value;
@ -827,13 +850,23 @@ gradient_calc_shapeburst_spherical_factor (GeglSampler *dist_sampler,
static gdouble
gradient_calc_shapeburst_dimpled_factor (GeglSampler *dist_sampler,
gdouble offset,
gdouble x,
gdouble y)
{
gfloat value;
offset = 1.0 - offset / 100.0;
gegl_sampler_get (dist_sampler, x, y, NULL, &value, GEGL_ABYSS_NONE);
if (value > offset)
value = 1.0;
else if (offset == 0.0)
value = (value <= 0.0) ? 0.0 : 1.0;
else
value = value / offset;
value = cos (0.5 * G_PI * value);
return value;
@ -893,16 +926,19 @@ gradient_render_pixel (gdouble x,
case GIMP_GRADIENT_SHAPEBURST_ANGULAR:
factor = gradient_calc_shapeburst_angular_factor (rbd->dist_sampler,
rbd->offset,
x, y);
break;
case GIMP_GRADIENT_SHAPEBURST_SPHERICAL:
factor = gradient_calc_shapeburst_spherical_factor (rbd->dist_sampler,
rbd->offset,
x, y);
break;
case GIMP_GRADIENT_SHAPEBURST_DIMPLED:
factor = gradient_calc_shapeburst_dimpled_factor (rbd->dist_sampler,
rbd->offset,
x, y);
break;