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app: add GimpDrawable::supports_alpha() vfunc

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Add a new GimpDrawable::supports_alpha() virtual function, and a
corresponding gimp_drawable_supports_alpha() function, which
determine if the drawable supports an alpha channel.  The default
implementation returns FALSE, and GimpLayer overrides it to return
TRUE.
This commit is contained in:
Ell
2020-01-17 11:24:31 +02:00
parent 6c0d20c9e6
commit 29a02b2949
3 changed files with 29 additions and 0 deletions
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18
app/core/gimpdrawable.c
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@ -172,6 +172,9 @@ static void gimp_drawable_real_update_all (GimpDrawable *drawable)
static GimpComponentMask
gimp_drawable_real_get_active_mask (GimpDrawable *drawable);
static gboolean gimp_drawable_real_supports_alpha
(GimpDrawable *drawable);
static void gimp_drawable_real_convert_type (GimpDrawable *drawable,
GimpImage *dest_image,
const Babl *new_format,
@ -301,6 +304,7 @@ gimp_drawable_class_init (GimpDrawableClass *klass)
klass->invalidate_boundary = NULL;
klass->get_active_components = NULL;
klass->get_active_mask = gimp_drawable_real_get_active_mask;
klass->supports_alpha = gimp_drawable_real_supports_alpha;
klass->convert_type = gimp_drawable_real_convert_type;
klass->apply_buffer = gimp_drawable_real_apply_buffer;
klass->get_buffer = gimp_drawable_real_get_buffer;
@ -830,6 +834,12 @@ gimp_drawable_real_get_active_mask (GimpDrawable *drawable)
return GIMP_COMPONENT_MASK_ALL;
}
static gboolean
gimp_drawable_real_supports_alpha (GimpDrawable *drawable)
{
return FALSE;
}
/* FIXME: this default impl is currently unused because no subclass
* chains up. the goal is to handle the almost identical subclass code
* here again.
@ -1222,6 +1232,14 @@ gimp_drawable_get_active_mask (GimpDrawable *drawable)
return mask;
}
gboolean
gimp_drawable_supports_alpha (GimpDrawable *drawable)
{
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
return GIMP_DRAWABLE_GET_CLASS (drawable)->supports_alpha (drawable);
}
void
gimp_drawable_convert_type (GimpDrawable *drawable,
GimpImage *dest_image,