/**
* gimp_display_shell_scale_by_values:
* @shell: the #GimpDisplayShell
* @scale: the new scale
* @offset_x: the new X offset
* @offset_y: the new Y offset
* @resize_window: whether the display window should be resized
*
* Directly sets the image scale and image offsets used by the display. If
* @resize_window is %TRUE then the display window is resized to better
* accommodate the image, see gimp_display_shell_shrink_wrap().
**/
void
gimp_display_shell_scale_by_values (GimpDisplayShell *shell,
gdouble scale,
gint offset_x,
gint offset_y,
gboolean resize_window)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
/* Abort early if the values are all setup already. We don't
* want to inadvertently resize the window (bug #164281).
*/
if (SCALE_EQUALS (gimp_zoom_model_get_factor (shell->zoom), scale) &&
shell->offset_x == offset_x &&
shell->offset_y == offset_y)
return;
gimp_display_shell_scale_save_revert_values (shell);
/* freeze the active tool */
gimp_display_shell_pause (shell);
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO, scale);
shell->offset_x = offset_x;
shell->offset_y = offset_y;
gimp_display_shell_rotate_update_transform (shell);
gimp_display_shell_scale_resize (shell, resize_window, FALSE);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
void
gimp_display_shell_scroll (GimpDisplayShell *shell,
gint x_offset,
gint y_offset)
{
gint old_x;
gint old_y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (x_offset == 0 && y_offset == 0)
return;
old_x = shell->offset_x;
old_y = shell->offset_y;
shell->offset_x += x_offset;
shell->offset_y += y_offset;
gimp_display_shell_scroll_clamp_offsets (shell);
/* the actual changes in offset */
x_offset = (shell->offset_x - old_x);
y_offset = (shell->offset_y - old_y);
if (x_offset || y_offset)
{
/* reset the old values so that the tool can accurately redraw */
shell->offset_x = old_x;
shell->offset_y = old_y;
gimp_display_shell_pause (shell);
/* set the offsets back to the new values */
shell->offset_x += x_offset;
shell->offset_y += y_offset;
gimp_display_shell_rotate_update_transform (shell);
gimp_overlay_box_scroll (GIMP_OVERLAY_BOX (shell->canvas),
-x_offset, -y_offset);
/* Update scrollbars and rulers */
gimp_display_shell_scale_update_scrollbars (shell);
gimp_display_shell_scale_update_rulers (shell);
gimp_display_shell_resume (shell);
gimp_display_shell_scrolled (shell);
}
}
/**
* gimp_display_shell_scroll_clamp_and_update:
* @shell:
*
* Helper function for calling two functions that are commonly called
* in pairs.
**/
void
gimp_display_shell_scroll_clamp_and_update (GimpDisplayShell *shell)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
if (image)
{
gint bounds_x;
gint bounds_y;
gint bounds_width;
gint bounds_height;
gint min_offset_x;
gint max_offset_x;
gint min_offset_y;
gint max_offset_y;
gint offset_x;
gint offset_y;
gimp_display_shell_rotate_update_transform (shell);
gimp_display_shell_scale_get_image_bounds (shell,
&bounds_x, &bounds_y,
&bounds_width, &bounds_height);
if (shell->disp_width < bounds_width)
{
min_offset_x = bounds_x -
shell->disp_width * OVERPAN_FACTOR;
max_offset_x = bounds_x + bounds_width -
shell->disp_width * (1.0 - OVERPAN_FACTOR);
}
else
{
gint overpan_amount;
overpan_amount = shell->disp_width -
bounds_width * (1.0 - OVERPAN_FACTOR);
min_offset_x = bounds_x -
overpan_amount;
max_offset_x = bounds_x + bounds_width - shell->disp_width +
overpan_amount;
}
if (shell->disp_height < bounds_height)
{
min_offset_y = bounds_y -
shell->disp_height * OVERPAN_FACTOR;
max_offset_y = bounds_y + bounds_height -
shell->disp_height * (1.0 - OVERPAN_FACTOR);
}
else
{
gint overpan_amount;
overpan_amount = shell->disp_height -
bounds_height * (1.0 - OVERPAN_FACTOR);
min_offset_y = bounds_y -
overpan_amount;
max_offset_y = bounds_y + bounds_height +
overpan_amount - shell->disp_height;
}
/* Clamp */
offset_x = CLAMP (shell->offset_x, min_offset_x, max_offset_x);
offset_y = CLAMP (shell->offset_y, min_offset_y, max_offset_y);
if (offset_x != shell->offset_x || offset_y != shell->offset_y)
{
shell->offset_x = offset_x;
shell->offset_y = offset_y;
gimp_display_shell_rotate_update_transform (shell);
}
/* Set scrollbar stepper sensitiity */
gimp_display_shell_scrollbars_update_steppers (shell,
min_offset_x,
max_offset_x,
min_offset_y,
max_offset_y);
}
else
{
shell->offset_x = 0;
shell->offset_y = 0;
}
gimp_display_shell_scrollbars_update (shell);
gimp_display_shell_rulers_update (shell);
}
