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cssimage: Add transition code for linear-gradient()

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This ensures feature-parity with the CSS spec and the -gtk-gradient()
notation.
This commit is contained in:
Benjamin Otte 2012-10-02 19:30:02 +02:00
parent dd99577691
commit 03f5ff20de
1 changed files with 75 additions and 0 deletions
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75
gtk/gtkcssimagelinear.c
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@ -451,6 +451,80 @@ gtk_css_image_linear_compute (GtkCssImage *image,
return GTK_CSS_IMAGE (copy);
}
static GtkCssImage *
gtk_css_image_linear_transition (GtkCssImage *start_image,
GtkCssImage *end_image,
guint property_id,
double progress)
{
GtkCssImageLinear *start, *end, *result;
guint i;
start = GTK_CSS_IMAGE_LINEAR (start_image);
if (end_image == NULL)
if (!GTK_IS_CSS_IMAGE_LINEAR (end_image))
return GTK_CSS_IMAGE_CLASS (_gtk_css_image_linear_parent_class)->transition (start_image, end_image, property_id, progress);
end = GTK_CSS_IMAGE_LINEAR (end_image);
if ((start->repeating != end->repeating)
|| (start->stops->len != end->stops->len))
return GTK_CSS_IMAGE_CLASS (_gtk_css_image_linear_parent_class)->transition (start_image, end_image, property_id, progress);
result = g_object_new (GTK_TYPE_CSS_IMAGE_LINEAR, NULL);
result->repeating = start->repeating;
result->angle = _gtk_css_value_transition (start->angle, end->angle, property_id, progress);
if (result->angle == NULL)
goto fail;
for (i = 0; i < start->stops->len; i++)
{
GtkCssImageLinearColorStop stop, *start_stop, *end_stop;
start_stop = &g_array_index (start->stops, GtkCssImageLinearColorStop, i);
end_stop = &g_array_index (end->stops, GtkCssImageLinearColorStop, i);
if ((start_stop->offset != NULL) != (end_stop->offset != NULL))
goto fail;
if (start_stop->offset == NULL)
{
stop.offset = NULL;
}
else
{
stop.offset = _gtk_css_value_transition (start_stop->offset,
end_stop->offset,
property_id,
progress);
if (stop.offset == NULL)
goto fail;
}
stop.color = _gtk_css_value_transition (start_stop->color,
end_stop->color,
property_id,
progress);
if (stop.color == NULL)
{
if (stop.offset)
_gtk_css_value_unref (stop.offset);
goto fail;
}
g_array_append_val (result->stops, stop);
}
return GTK_CSS_IMAGE (result);
fail:
g_object_unref (result);
return GTK_CSS_IMAGE_CLASS (_gtk_css_image_linear_parent_class)->transition (start_image, end_image, property_id, progress);
}
static void
gtk_css_image_linear_dispose (GObject *object)
{
@ -481,6 +555,7 @@ _gtk_css_image_linear_class_init (GtkCssImageLinearClass *klass)
image_class->parse = gtk_css_image_linear_parse;
image_class->print = gtk_css_image_linear_print;
image_class->compute = gtk_css_image_linear_compute;
image_class->transition = gtk_css_image_linear_transition;
object_class->dispose = gtk_css_image_linear_dispose;
}