static void
gimp_shear_tool_recalc_matrix (GimpTransformTool *tr_tool)
{
gdouble amount;
if (tr_tool->trans_info[XSHEAR] == 0.0 &&
tr_tool->trans_info[YSHEAR] == 0.0)
{
tr_tool->trans_info[HORZ_OR_VERT] = GIMP_ORIENTATION_UNKNOWN;
}
if (tr_tool->trans_info[HORZ_OR_VERT] == GIMP_ORIENTATION_HORIZONTAL)
amount = tr_tool->trans_info[XSHEAR];
else
amount = tr_tool->trans_info[YSHEAR];
gimp_matrix3_identity (&tr_tool->transform);
gimp_transform_matrix_shear (&tr_tool->transform,
tr_tool->x1,
tr_tool->y1,
tr_tool->x2 - tr_tool->x1,
tr_tool->y2 - tr_tool->y1,
tr_tool->trans_info[HORZ_OR_VERT],
amount);
}
static GimpValueArray *
shear_invoker (GimpProcedure *procedure,
Gimp *gimp,
GimpContext *context,
GimpProgress *progress,
const GimpValueArray *args,
GError **error)
{
gboolean success = TRUE;
GimpValueArray *return_vals;
GimpDrawable *drawable;
gboolean interpolation;
gint32 shear_type;
gdouble magnitude;
drawable = gimp_value_get_drawable (gimp_value_array_index (args, 0), gimp);
interpolation = g_value_get_boolean (gimp_value_array_index (args, 1));
shear_type = g_value_get_enum (gimp_value_array_index (args, 2));
magnitude = g_value_get_double (gimp_value_array_index (args, 3));
if (success)
{
gint x, y, width, height;
success = gimp_pdb_item_is_attached (GIMP_ITEM (drawable), NULL, TRUE, error);
if (success &&
gimp_item_mask_intersect (GIMP_ITEM (drawable), &x, &y, &width, &height))
{
GimpMatrix3 matrix;
GimpInterpolationType interpolation_type = GIMP_INTERPOLATION_NONE;
gint off_x, off_y;
gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
x += off_x;
y += off_y;
/* Assemble the transformation matrix */
gimp_matrix3_identity (&matrix);
gimp_transform_matrix_shear (&matrix,
x, y, width, height,
shear_type, magnitude);
if (interpolation)
interpolation_type = gimp->config->interpolation_type;
if (progress)
gimp_progress_start (progress, _("Shearing"), FALSE);
if (! gimp_viewable_get_children (GIMP_VIEWABLE (drawable)) &&
! gimp_channel_is_empty (gimp_image_get_mask (gimp_item_get_image (GIMP_ITEM (drawable)))))
{
if (! gimp_drawable_transform_affine (drawable, context,
&matrix,
GIMP_TRANSFORM_FORWARD,
interpolation_type, 3,
FALSE, progress))
{
success = FALSE;
}
}
else
{
gimp_item_transform (GIMP_ITEM (drawable), context, &matrix,
GIMP_TRANSFORM_FORWARD,
interpolation, 3,
FALSE, progress);
}
if (progress)
gimp_progress_end (progress);
}
}
return_vals = gimp_procedure_get_return_values (procedure, success,
error ? *error : NULL);
if (success)
gimp_value_set_drawable (gimp_value_array_index (return_vals, 1), drawable);
return return_vals;
}
