static pixman_transform
Matrix3DToPixman(const gfx3DMatrix& aMatrix)
{
pixman_f_transform transform;
transform.m[0][0] = aMatrix._11;
transform.m[0][1] = aMatrix._21;
transform.m[0][2] = aMatrix._41;
transform.m[1][0] = aMatrix._12;
transform.m[1][1] = aMatrix._22;
transform.m[1][2] = aMatrix._42;
transform.m[2][0] = aMatrix._14;
transform.m[2][1] = aMatrix._24;
transform.m[2][2] = aMatrix._44;
pixman_transform result;
pixman_transform_from_pixman_f_transform(&result, &transform);
return result;
}
static void
rescale (GtkWidget *may_be_null, app_t *app)
{
pixman_f_transform_t ftransform;
pixman_transform_t transform;
double new_width, new_height;
double fscale_x, fscale_y;
double rotation;
pixman_fixed_t *params;
int n_params;
double sx, sy;
pixman_f_transform_init_identity (&ftransform);
if (may_be_null && gtk_toggle_button_get_active (
GTK_TOGGLE_BUTTON (get_widget (app, "lock_checkbutton"))))
{
copy_to_counterpart (app, G_OBJECT (may_be_null));
}
fscale_x = gtk_adjustment_get_value (app->scale_x_adjustment);
fscale_y = gtk_adjustment_get_value (app->scale_y_adjustment);
rotation = gtk_adjustment_get_value (app->rotate_adjustment);
fscale_x = to_scale (fscale_x);
fscale_y = to_scale (fscale_y);
new_width = pixman_image_get_width (app->original) * fscale_x;
new_height = pixman_image_get_height (app->original) * fscale_y;
pixman_f_transform_scale (&ftransform, NULL, fscale_x, fscale_y);
pixman_f_transform_translate (&ftransform, NULL, - new_width / 2.0, - new_height / 2.0);
rotation = (rotation / 360.0) * 2 * M_PI;
pixman_f_transform_rotate (&ftransform, NULL, cos (rotation), sin (rotation));
pixman_f_transform_translate (&ftransform, NULL, new_width / 2.0, new_height / 2.0);
pixman_f_transform_invert (&ftransform, &ftransform);
compute_extents (&ftransform, &sx, &sy);
pixman_transform_from_pixman_f_transform (&transform, &ftransform);
pixman_image_set_transform (app->original, &transform);
params = pixman_filter_create_separable_convolution (
&n_params,
sx * 65536.0 + 0.5,
sy * 65536.0 + 0.5,
get_value (app, filters, "reconstruct_x_combo_box"),
get_value (app, filters, "reconstruct_y_combo_box"),
get_value (app, filters, "sample_x_combo_box"),
get_value (app, filters, "sample_y_combo_box"),
gtk_adjustment_get_value (app->subsample_adjustment),
gtk_adjustment_get_value (app->subsample_adjustment));
pixman_image_set_filter (app->original, PIXMAN_FILTER_SEPARABLE_CONVOLUTION, params, n_params);
pixman_image_set_repeat (
app->original, get_value (app, repeats, "repeat_combo_box"));
free (params);
app->scaled_width = ceil (new_width);
app->scaled_height = ceil (new_height);
gtk_widget_set_size_request (
get_widget (app, "drawing_area"), new_width + 0.5, new_height + 0.5);
gtk_widget_queue_draw (
get_widget (app, "drawing_area"));
}
