void
gimp_display_shell_canvas_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpDisplayShell *shell)
{
/* are we in destruction? */
if (! shell->display || ! gimp_display_get_shell (shell->display))
return;
if ((shell->disp_width != allocation->width) ||
(shell->disp_height != allocation->height))
{
if (shell->zoom_on_resize &&
shell->disp_width > 64 &&
shell->disp_height > 64 &&
allocation->width > 64 &&
allocation->height > 64)
{
gdouble scale = gimp_zoom_model_get_factor (shell->zoom);
gint offset_x;
gint offset_y;
/* FIXME: The code is a bit of a mess */
/* multiply the zoom_factor with the ratio of the new and
* old canvas diagonals
*/
scale *= (sqrt (SQR (allocation->width) +
SQR (allocation->height)) /
sqrt (SQR (shell->disp_width) +
SQR (shell->disp_height)));
offset_x = UNSCALEX (shell, shell->offset_x);
offset_y = UNSCALEX (shell, shell->offset_y);
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO, scale);
shell->offset_x = SCALEX (shell, offset_x);
shell->offset_y = SCALEY (shell, offset_y);
}
shell->disp_width = allocation->width;
shell->disp_height = allocation->height;
/* When we size-allocate due to resize of the top level window,
* we want some additional logic. Don't apply it on
* zoom_on_resize though.
*/
if (shell->size_allocate_from_configure_event &&
! shell->zoom_on_resize)
{
gboolean center_horizontally;
gboolean center_vertically;
gint target_offset_x;
gint target_offset_y;
gint sw;
gint sh;
gimp_display_shell_scale_get_image_size (shell, &sw, &sh);
center_horizontally = sw <= shell->disp_width;
center_vertically = sh <= shell->disp_height;
gimp_display_shell_scroll_center_image (shell,
center_horizontally,
center_vertically);
/* This is basically the best we can do before we get an
* API for storing the image offset at the start of an
* image window resize using the mouse
*/
target_offset_x = shell->offset_x;
target_offset_y = shell->offset_y;
if (! center_horizontally)
{
target_offset_x = MAX (shell->offset_x, 0);
}
if (! center_vertically)
{
target_offset_y = MAX (shell->offset_y, 0);
}
gimp_display_shell_scroll_set_offset (shell,
target_offset_x,
target_offset_y);
}
gimp_display_shell_scroll_clamp_and_update (shell);
gimp_display_shell_scaled (shell);
/* Reset */
shell->size_allocate_from_configure_event = FALSE;
}
}
/**
* gimp_display_shell_scale_to_rectangle:
* @shell: the #GimpDisplayShell
* @zoom_type: whether to zoom in or out
* @x: retangle's x in image coordinates
* @y: retangle's y in image coordinates
* @width: retangle's width in image coordinates
* @height: retangle's height in image coordinates
* @resize_window: whether the display window should be resized
*
* Scales and scrolls to a specific image rectangle
**/
void
gimp_display_shell_scale_to_rectangle (GimpDisplayShell *shell,
GimpZoomType zoom_type,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
gboolean resize_window)
{
GimpImage *image;
gdouble current_scale;
gdouble new_scale;
gdouble display_width;
gdouble display_height;
gdouble factor = 1.0;
gint offset_x = 0;
gint offset_y = 0;
gdouble xres;
gdouble yres;
gdouble screen_xres;
gdouble screen_yres;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
width = MAX (1.0, width);
height = MAX (1.0, height);
current_scale = gimp_zoom_model_get_factor (shell->zoom);
display_width = FUNSCALEX (shell, shell->disp_width);
display_height = FUNSCALEY (shell, shell->disp_height);
switch (zoom_type)
{
case GIMP_ZOOM_IN:
factor = MIN ((display_width / width),
(display_height / height));
break;
case GIMP_ZOOM_OUT:
factor = MAX ((width / display_width),
(height / display_height));
break;
default:
g_return_if_reached ();
break;
}
new_scale = current_scale * factor;
gimp_image_get_resolution (image, &xres, &yres);
gimp_display_shell_scale_get_screen_resolution (shell,
&screen_xres, &screen_yres);
switch (zoom_type)
{
case GIMP_ZOOM_IN:
/* move the center of the rectangle to the center of the
* viewport:
*
* new_offset = center of rectangle in new scale screen coords
* including offset
* -
* center of viewport in screen coords without
* offset
*/
offset_x = RINT (new_scale * (x + width / 2.0) *
screen_xres / xres -
(shell->disp_width / 2.0));
offset_y = RINT (new_scale * (y + height / 2.0) *
screen_yres / yres -
(shell->disp_height / 2.0));
break;
case GIMP_ZOOM_OUT:
/* move the center of the viewport to the center of the
* rectangle:
*
* new_offset = center of viewport in new scale screen coords
* including offset
* -
* center of rectangle in screen coords without
* offset
*/
offset_x = RINT (new_scale * UNSCALEX (shell,
shell->offset_x +
shell->disp_width / 2.0) *
screen_xres / xres -
(SCALEX (shell, x + width / 2.0) -
shell->offset_x));
offset_y = RINT (new_scale * UNSCALEY (shell,
shell->offset_y +
shell->disp_height / 2.0) *
screen_yres / yres -
(SCALEY (shell, y + height / 2.0) -
shell->offset_y));
break;
default:
break;
}
if (new_scale != current_scale ||
offset_x != shell->offset_x ||
offset_y != shell->offset_y)
{
gimp_display_shell_scale_by_values (shell,
new_scale,
offset_x, offset_y,
resize_window);
}
}
