/**
* gimp_display_shell_scale_to:
* @shell:
* @scale:
* @viewport_x:
* @viewport_y:
*
* Zooms. The display offsets are adjusted so that the point specified
* by @x and @y doesn't change it's position on screen.
**/
static void
gimp_display_shell_scale_to (GimpDisplayShell *shell,
gdouble scale,
gint viewport_x,
gint viewport_y)
{
gdouble scale_x, scale_y;
gdouble image_focus_x, image_focus_y;
gint target_offset_x, target_offset_y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->display)
return;
gimp_display_shell_untransform_xy_f (shell,
viewport_x,
viewport_y,
&image_focus_x,
&image_focus_y);
gimp_display_shell_calculate_scale_x_and_y (shell, scale, &scale_x, &scale_y);
target_offset_x = scale_x * image_focus_x - viewport_x;
target_offset_y = scale_y * image_focus_y - viewport_y;
/* Note that we never come here if we need to
* resize_windows_on_zoom
*/
gimp_display_shell_scale_by_values (shell,
scale,
target_offset_x,
target_offset_y,
FALSE);
}
/**
* gimp_display_shell_scale_get_image_size_for_scale:
* @shell:
* @scale:
* @w:
* @h:
*
**/
static void
gimp_display_shell_scale_get_image_size_for_scale (GimpDisplayShell *shell,
gdouble scale,
gint *w,
gint *h)
{
GimpImage *image = gimp_display_get_image (shell->display);
gdouble scale_x;
gdouble scale_y;
gimp_display_shell_calculate_scale_x_and_y (shell, scale, &scale_x, &scale_y);
if (w) *w = scale_x * gimp_image_get_width (image);
if (h) *h = scale_y * gimp_image_get_height (image);
}
/* We used to calculate the scale factor in the SCALEFACTOR_X() and
* SCALEFACTOR_Y() macros. But since these are rather frequently
* called and the values rarely change, we now store them in the
* shell and call this function whenever they need to be recalculated.
*/
void
gimp_display_shell_scale_update (GimpDisplayShell *shell)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
if (image)
{
gimp_display_shell_calculate_scale_x_and_y (shell,
gimp_zoom_model_get_factor (shell->zoom),
&shell->scale_x,
&shell->scale_y);
}
else
{
shell->scale_x = 1.0;
shell->scale_y = 1.0;
}
}
