/**
* gimp_display_shell_scale_get_zoom_focus:
* @shell:
* @new_scale:
* @x:
* @y:
*
* Calculates the viewport coordinate to focus on when zooming
* independently for each axis.
**/
static void
gimp_display_shell_scale_get_zoom_focus (GimpDisplayShell *shell,
gdouble new_scale,
gdouble current_scale,
gdouble *x,
gdouble *y,
GimpZoomFocus zoom_focus)
{
GtkWidget *window = GTK_WIDGET (gimp_display_shell_get_window (shell));
GdkEvent *event;
gint image_center_x;
gint image_center_y;
gint other_x;
gint other_y;
/* Calculate stops-to-fit focus point */
gimp_display_shell_scale_get_image_center_viewport (shell,
&image_center_x,
&image_center_y);
/* Calculate other focus point, default is the canvas center */
other_x = shell->disp_width / 2;
other_y = shell->disp_height / 2;
/* Center on the mouse position instead of the display center if
* one of the following conditions are fulfilled and pointer is
* within the canvas:
*
* (1) there's no current event (the action was triggered by an
* input controller)
* (2) the event originates from the canvas (a scroll event)
* (3) the event originates from the window (a key press event)
*
* Basically the only situation where we don't want to center on
* mouse position is if the action is being called from a menu.
*/
event = gtk_get_current_event ();
if (! event ||
gtk_get_event_widget (event) == shell->canvas ||
gtk_get_event_widget (event) == window)
{
GdkPoint *point = g_queue_pop_head (shell->zoom_focus_pointer_queue);
gint canvas_pointer_x;
gint canvas_pointer_y;
if (point)
{
canvas_pointer_x = point->x;
canvas_pointer_y = point->y;
g_slice_free (GdkPoint, point);
}
else
{
gtk_widget_get_pointer (shell->canvas,
&canvas_pointer_x,
&canvas_pointer_y);
}
if (canvas_pointer_x >= 0 &&
canvas_pointer_y >= 0 &&
canvas_pointer_x < shell->disp_width &&
canvas_pointer_y < shell->disp_height)
{
other_x = canvas_pointer_x;
other_y = canvas_pointer_y;
}
}
/* Decide which one to use for each axis */
if (zoom_focus == GIMP_ZOOM_FOCUS_RETAIN_CENTERING_ELSE_BEST_GUESS)
{
if (gimp_display_shell_scale_viewport_coord_almost_centered (shell,
image_center_x,
image_center_y,
NULL,
NULL))
{
zoom_focus = GIMP_ZOOM_FOCUS_IMAGE_CENTER;
}
else
{
zoom_focus = GIMP_ZOOM_FOCUS_BEST_GUESS;
}
}
switch (zoom_focus)
{
case GIMP_ZOOM_FOCUS_POINTER:
*x = other_x;
*y = other_y;
break;
case GIMP_ZOOM_FOCUS_IMAGE_CENTER:
*x = image_center_x;
*y = image_center_y;
break;
case GIMP_ZOOM_FOCUS_BEST_GUESS:
default:
{
gboolean within_horizontally, within_vertically;
gboolean stops_horizontally, stops_vertically;
gimp_display_shell_scale_image_is_within_viewport (shell,
&within_horizontally,
&within_vertically);
gimp_display_shell_scale_image_stops_to_fit (shell,
new_scale,
current_scale,
&stops_horizontally,
&stops_vertically);
*x = within_horizontally && ! stops_horizontally ? image_center_x : other_x;
*y = within_vertically && ! stops_vertically ? image_center_y : other_y;
}
break;
}
}
/**
* gimp_display_shell_scale:
* @shell: the #GimpDisplayShell
* @zoom_type: whether to zoom in, our or to a specific scale
* @scale: ignored unless @zoom_type == %GIMP_ZOOM_TO
*
* This function figures out the context of the zoom and behaves
* appropriatley thereafter.
*
**/
void
gimp_display_shell_scale (GimpDisplayShell *shell,
GimpZoomType zoom_type,
gdouble new_scale,
GimpZoomFocus zoom_focus)
{
gdouble current_scale;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (shell->canvas != NULL);
current_scale = gimp_zoom_model_get_factor (shell->zoom);
if (zoom_type != GIMP_ZOOM_TO)
new_scale = gimp_zoom_model_zoom_step (zoom_type, current_scale);
if (! SCALE_EQUALS (new_scale, current_scale))
{
GimpDisplayConfig *config = shell->display->config;
gboolean resize_window;
/* Resize windows only in multi-window mode */
resize_window = (config->resize_windows_on_zoom &&
! GIMP_GUI_CONFIG (config)->single_window_mode);
if (resize_window)
{
/* If the window is resized on zoom, simply do the zoom and
* get things rolling
*/
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO, new_scale);
gimp_display_shell_scale_resize (shell, TRUE, FALSE);
}
else
{
gboolean starts_fitting_horiz;
gboolean starts_fitting_vert;
gboolean zoom_focus_almost_centered_horiz;
gboolean zoom_focus_almost_centered_vert;
gboolean image_center_almost_centered_horiz;
gboolean image_center_almost_centered_vert;
gdouble x, y;
gint image_center_x;
gint image_center_y;
gimp_display_shell_scale_get_zoom_focus (shell,
new_scale,
current_scale,
&x,
&y,
zoom_focus);
gimp_display_shell_scale_get_image_center_viewport (shell,
&image_center_x,
&image_center_y);
gimp_display_shell_scale_to (shell, new_scale, x, y);
/* If an image axis started to fit due to zooming out or if
* the focus point is as good as in the center, center on
* that axis
*/
gimp_display_shell_scale_image_starts_to_fit (shell,
new_scale,
current_scale,
&starts_fitting_horiz,
&starts_fitting_vert);
gimp_display_shell_scale_viewport_coord_almost_centered (shell,
x,
y,
&zoom_focus_almost_centered_horiz,
&zoom_focus_almost_centered_vert);
gimp_display_shell_scale_viewport_coord_almost_centered (shell,
image_center_x,
image_center_y,
&image_center_almost_centered_horiz,
&image_center_almost_centered_vert);
gimp_display_shell_scroll_center_image (shell,
starts_fitting_horiz ||
(zoom_focus_almost_centered_horiz &&
image_center_almost_centered_horiz),
starts_fitting_vert ||
(zoom_focus_almost_centered_vert &&
image_center_almost_centered_vert));
}
}
}
/**
* gimp_display_shell_scale:
* @shell: the #GimpDisplayShell
* @zoom_type: whether to zoom in, our or to a specific scale
* @scale: ignored unless @zoom_type == %GIMP_ZOOM_TO
*
* This function figures out the context of the zoom and behaves
* appropriatley thereafter.
*
**/
void
gimp_display_shell_scale (GimpDisplayShell *shell,
GimpZoomType zoom_type,
gdouble new_scale,
GimpZoomFocus zoom_focus)
{
gint x, y;
gdouble current_scale;
gdouble real_new_scale;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
g_return_if_fail (shell->canvas != NULL);
current_scale = gimp_zoom_model_get_factor (shell->zoom);
if (zoom_type != GIMP_ZOOM_TO)
{
real_new_scale = gimp_zoom_model_zoom_step (zoom_type, current_scale);
}
else
{
real_new_scale = new_scale;
}
if (! SCALE_EQUALS (real_new_scale, current_scale))
{
if (shell->display->config->resize_windows_on_zoom)
{
GimpImageWindow *window = gimp_display_shell_get_window (shell);
/* If the window is resized on zoom, simply do the zoom and
* get things rolling
*/
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO, real_new_scale);
gimp_display_shell_scaled (shell);
if (window && gimp_image_window_get_active_shell (window) == shell)
{
gimp_image_window_shrink_wrap (window, FALSE);
}
}
else
{
gboolean starts_fitting_horiz;
gboolean starts_fitting_vert;
gboolean zoom_focus_almost_centered_horiz;
gboolean zoom_focus_almost_centered_vert;
gboolean image_center_almost_centered_horiz;
gboolean image_center_almost_centered_vert;
gint image_center_x;
gint image_center_y;
gimp_display_shell_scale_get_zoom_focus (shell,
real_new_scale,
current_scale,
&x,
&y,
zoom_focus);
gimp_display_shell_scale_get_image_center_viewport (shell,
&image_center_x,
&image_center_y);
gimp_display_shell_scale_to (shell, real_new_scale, x, y);
/* If an image axis started to fit due to zooming out or if
* the focus point is as good as in the center, center on
* that axis
*/
gimp_display_shell_scale_image_starts_to_fit (shell,
real_new_scale,
current_scale,
&starts_fitting_horiz,
&starts_fitting_vert);
gimp_display_shell_scale_viewport_coord_almost_centered (shell,
x,
y,
&zoom_focus_almost_centered_horiz,
&zoom_focus_almost_centered_vert);
gimp_display_shell_scale_viewport_coord_almost_centered (shell,
image_center_x,
image_center_y,
&image_center_almost_centered_horiz,
&image_center_almost_centered_vert);
gimp_display_shell_scroll_center_image (shell,
starts_fitting_horiz ||
(zoom_focus_almost_centered_horiz &&
image_center_almost_centered_horiz),
starts_fitting_vert ||
(zoom_focus_almost_centered_vert &&
image_center_almost_centered_vert));
}
}
}
