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app: derive GimpOperationSetAlpha from GeglOperationPointComposer 

and use the aux input as additional source of alpha.
This commit is contained in:
Michael Natterer 2012-03-18 20:22:09 +01:00
parent 066d5d84c9
commit c23f7f9f14
2 changed files with 42 additions and 13 deletions
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51
app/gegl/gimpoperationsetalpha.c
View File

@ -43,15 +43,17 @@ static void gimp_operation_set_alpha_set_property (GObject *object,
const GValue *value,
GParamSpec *pspec);
static void gimp_operation_set_alpha_prepare (GeglOperation *operation);
static gboolean gimp_operation_set_alpha_process (GeglOperation *operation,
void *in_buf,
void *aux_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi);
G_DEFINE_TYPE (GimpOperationSetAlpha, gimp_operation_set_alpha,
GEGL_TYPE_OPERATION_POINT_FILTER)
GEGL_TYPE_OPERATION_POINT_COMPOSER)
#define parent_class gimp_operation_set_alpha_parent_class
@ -59,9 +61,9 @@ G_DEFINE_TYPE (GimpOperationSetAlpha, gimp_operation_set_alpha,
static void
gimp_operation_set_alpha_class_init (GimpOperationSetAlphaClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GeglOperationPointFilterClass *point_class = GEGL_OPERATION_POINT_FILTER_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GeglOperationPointComposerClass *point_class = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
object_class->set_property = gimp_operation_set_alpha_set_property;
object_class->get_property = gimp_operation_set_alpha_get_property;
@ -69,6 +71,7 @@ gimp_operation_set_alpha_class_init (GimpOperationSetAlphaClass *klass)
operation_class->name = "gimp:set-alpha";
operation_class->categories = "color";
operation_class->description = "Set a buffer's alpha channel to a value";
operation_class->prepare = gimp_operation_set_alpha_prepare;
point_class->process = gimp_operation_set_alpha_process;
@ -126,26 +129,52 @@ gimp_operation_set_alpha_set_property (GObject *object,
}
}
static void
gimp_operation_set_alpha_prepare (GeglOperation *operation)
{
gegl_operation_set_format (operation, "input", babl_format ("RGBA float"));
gegl_operation_set_format (operation, "aux", babl_format ("Y float"));
gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
}
static gboolean
gimp_operation_set_alpha_process (GeglOperation *operation,
void *in_buf,
void *aux_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi)
{
GimpOperationSetAlpha *self = GIMP_OPERATION_SET_ALPHA (operation);
gfloat *src = in_buf;
gfloat *aux = aux_buf;
gfloat *dest = out_buf;
while (samples--)
if (aux)
{
dest[RED] = src[RED];
dest[GREEN] = src[GREEN];
dest[BLUE] = src[BLUE];
dest[ALPHA] = self->value;
while (samples--)
{
dest[RED] = src[RED];
dest[GREEN] = src[GREEN];
dest[BLUE] = src[BLUE];
dest[ALPHA] = self->value * src[0];
src += 4;
dest += 4;
src += 4;
dest += 4;
}
}
else
{
while (samples--)
{
dest[RED] = src[RED];
dest[GREEN] = src[GREEN];
dest[BLUE] = src[BLUE];
dest[ALPHA] = self->value;
src += 4;
dest += 4;
}
}
return TRUE;

4
app/gegl/gimpoperationsetalpha.h
View File

@ -38,14 +38,14 @@ typedef struct _GimpOperationSetAlphaClass GimpOperationSetAlphaClass;
struct _GimpOperationSetAlpha
{
GeglOperationPointFilter parent_instance;
GeglOperationPointComposer parent_instance;
gdouble value;
};
struct _GimpOperationSetAlphaClass
{
GeglOperationPointFilterClass parent_class;
GeglOperationPointComposerClass parent_class;
};