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gimp/app/display/gimpdisplayshell-scale.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "display-types.h"
#include "config/gimpguiconfig.h"
#include "core/gimp.h"
#include "core/gimpimage.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-expose.h"
#include "gimpdisplayshell-scale.h"
#include "gimpdisplayshell-scroll.h"
#include "gimpdisplayshell-transform.h"
#include "gimpimagewindow.h"
#define SCALE_TIMEOUT 2
#define SCALE_EPSILON 0.0001
#define ALMOST_CENTERED_THRESHOLD 2
#define SCALE_EQUALS(a,b) (fabs ((a) - (b)) < SCALE_EPSILON)
/* local function prototypes */
static void gimp_display_shell_scale_get_screen_resolution
(GimpDisplayShell *shell,
gdouble *xres,
gdouble *yres);
static void gimp_display_shell_scale_get_image_size_for_scale
(GimpDisplayShell *shell,
gdouble scale,
gint *w,
gint *h);
static void gimp_display_shell_calculate_scale_x_and_y
(GimpDisplayShell *shell,
gdouble scale,
gdouble *scale_x,
gdouble *scale_y);
static void gimp_display_shell_scale_to (GimpDisplayShell *shell,
gdouble scale,
gdouble viewport_x,
gdouble viewport_y);
static gboolean gimp_display_shell_scale_image_starts_to_fit
(GimpDisplayShell *shell,
gdouble new_scale,
gdouble current_scale,
gboolean *vertically,
gboolean *horizontally);
static gboolean gimp_display_shell_scale_viewport_coord_almost_centered
(GimpDisplayShell *shell,
gint x,
gint y,
gboolean *horizontally,
gboolean *vertically);
static void gimp_display_shell_scale_get_image_center_viewport
(GimpDisplayShell *shell,
gint *image_center_x,
gint *image_center_y);
static void gimp_display_shell_scale_get_zoom_focus (GimpDisplayShell *shell,
gdouble new_scale,
gdouble current_scale,
gdouble *x,
gdouble *y,
GimpZoomFocus zoom_focus);
/* public functions */
/**
* gimp_display_shell_scale_revert:
* @shell: the #GimpDisplayShell
*
* Reverts the display to the previously used scale. If no previous
* scale exist, then the call does nothing.
*
* Return value: %TRUE if the scale was reverted, otherwise %FALSE.
**/
gboolean
gimp_display_shell_scale_revert (GimpDisplayShell *shell)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), FALSE);
/* don't bother if no scale has been set */
if (shell->last_scale < SCALE_EPSILON)
return FALSE;
shell->last_scale_time = 0;
gimp_display_shell_scale_by_values (shell,
shell->last_scale,
shell->last_offset_x,
shell->last_offset_y,
FALSE); /* don't resize the window */
return TRUE;
}
/**
* gimp_display_shell_scale_can_revert:
* @shell: the #GimpDisplayShell
*
* Return value: %TRUE if a previous display scale exists, otherwise %FALSE.
**/
gboolean
gimp_display_shell_scale_can_revert (GimpDisplayShell *shell)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), FALSE);
return (shell->last_scale > SCALE_EPSILON);
}
/**
* gimp_display_shell_scale_save_revert_values:
* @shell:
*
* Handle the updating of the Revert Zoom variables.
**/
void
gimp_display_shell_scale_save_revert_values (GimpDisplayShell *shell)
{
guint now;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
now = time (NULL);
if (now - shell->last_scale_time >= SCALE_TIMEOUT)
{
shell->last_scale = gimp_zoom_model_get_factor (shell->zoom);
shell->last_offset_x = shell->offset_x;
shell->last_offset_y = shell->offset_y;
}
shell->last_scale_time = now;
}
/**
* gimp_display_shell_scale_set_dot_for_dot:
* @shell: the #GimpDisplayShell
* @dot_for_dot: whether "Dot for Dot" should be enabled
*
* If @dot_for_dot is set to %TRUE then the "Dot for Dot" mode (where image and
* screen pixels are of the same size) is activated. Dually, the mode is
* disabled if @dot_for_dot is %FALSE.
**/
void
gimp_display_shell_scale_set_dot_for_dot (GimpDisplayShell *shell,
gboolean dot_for_dot)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (dot_for_dot != shell->dot_for_dot)
{
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);
/* freeze the active tool */
gimp_display_shell_pause (shell);
shell->dot_for_dot = dot_for_dot;
gimp_display_shell_scale_update (shell);
gimp_display_shell_scale_resize (shell, resize_window, FALSE);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
}
/**
* gimp_display_shell_scale_get_image_size:
* @shell:
* @w:
* @h:
*
* Gets the size of the rendered image after it has been scaled.
*
**/
void
gimp_display_shell_scale_get_image_size (GimpDisplayShell *shell,
gint *w,
gint *h)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_scale_get_image_size_for_scale (shell,
gimp_zoom_model_get_factor (shell->zoom),
w, h);
}
/**
* gimp_display_shell_scale_image_is_within_viewport:
* @shell:
*
* Returns: %TRUE if the (scaled) image is smaller than and within the
* viewport.
**/
gboolean
gimp_display_shell_scale_image_is_within_viewport (GimpDisplayShell *shell,
gboolean *horizontally,
gboolean *vertically)
{
gint sw, sh;
gboolean horizontally_dummy, vertically_dummy;
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), FALSE);
if (! horizontally) horizontally = &horizontally_dummy;
if (! vertically) vertically = &vertically_dummy;
gimp_display_shell_scale_get_image_size (shell, &sw, &sh);
*horizontally = sw <= shell->disp_width &&
shell->offset_x <= 0 &&
shell->offset_x >= sw - shell->disp_width;
*vertically = sh <= shell->disp_height &&
shell->offset_y <= 0 &&
shell->offset_y >= sh - shell->disp_height;
return *vertically && *horizontally;
}
/* 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;
}
}
/**
* 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_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);
}
}
/**
* gimp_display_shell_scale_fit_in:
* @shell: the #GimpDisplayShell
*
* Sets the scale such that the entire image precisely fits in the
* display area.
**/
void
gimp_display_shell_scale_fit_in (GimpDisplayShell *shell)
{
GimpImage *image;
gint image_width;
gint image_height;
gdouble xres;
gdouble yres;
gdouble zoom_factor;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
image_width = gimp_image_get_width (image);
image_height = gimp_image_get_height (image);
gimp_image_get_resolution (image, &xres, &yres);
if (! shell->dot_for_dot)
{
image_width = ROUND (image_width * shell->monitor_xres / xres);
image_height = ROUND (image_height * shell->monitor_yres / yres);
}
zoom_factor = MIN ((gdouble) shell->disp_width / (gdouble) image_width,
(gdouble) shell->disp_height / (gdouble) image_height);
gimp_display_shell_scale (shell,
GIMP_ZOOM_TO,
zoom_factor,
GIMP_ZOOM_FOCUS_BEST_GUESS);
gimp_display_shell_scroll_center_image (shell, TRUE, TRUE);
}
/**
* gimp_display_shell_scale_fill:
* @shell: the #GimpDisplayShell
*
* Sets the scale such that the entire display area is precisely
* filled by the image.
**/
void
gimp_display_shell_scale_fill (GimpDisplayShell *shell)
{
GimpImage *image;
gint image_width;
gint image_height;
gdouble xres;
gdouble yres;
gdouble zoom_factor;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
image_width = gimp_image_get_width (image);
image_height = gimp_image_get_height (image);
gimp_image_get_resolution (image, &xres, &yres);
if (! shell->dot_for_dot)
{
image_width = ROUND (image_width * shell->monitor_xres / xres);
image_height = ROUND (image_height * shell->monitor_yres / yres);
}
zoom_factor = MAX ((gdouble) shell->disp_width / (gdouble) image_width,
(gdouble) shell->disp_height / (gdouble) image_height);
gimp_display_shell_scale (shell,
GIMP_ZOOM_TO,
zoom_factor,
GIMP_ZOOM_FOCUS_BEST_GUESS);
gimp_display_shell_scroll_center_image (shell, TRUE, TRUE);
}
/**
* 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_scale_resize (shell, resize_window, FALSE);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
/**
* gimp_display_shell_scale_shrink_wrap:
* @shell: the #GimpDisplayShell
*
* Convenience function with the same functionality as
* gimp_display_shell_scale_resize(@shell, TRUE, grow_only).
**/
void
gimp_display_shell_scale_shrink_wrap (GimpDisplayShell *shell,
gboolean grow_only)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_scale_resize (shell, TRUE, grow_only);
}
/**
* gimp_display_shell_scale_resize:
* @shell: the #GimpDisplayShell
* @resize_window: whether the display window should be resized
* @grow_only: whether shrinking of the window is allowed or not
*
* Function commonly called after a change in display scale to make the changes
* visible to the user. If @resize_window is %TRUE then the display window is
* resized to accommodate the display image as per
* gimp_display_shell_shrink_wrap().
**/
void
gimp_display_shell_scale_resize (GimpDisplayShell *shell,
gboolean resize_window,
gboolean grow_only)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
/* freeze the active tool */
gimp_display_shell_pause (shell);
if (resize_window)
{
GimpImageWindow *window = gimp_display_shell_get_window (shell);
if (window && gimp_image_window_get_active_shell (window) == shell)
{
gimp_image_window_shrink_wrap (window, grow_only);
}
}
gimp_display_shell_scroll_clamp_and_update (shell);
gimp_display_shell_scaled (shell);
gimp_display_shell_expose_full (shell);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
void
gimp_display_shell_set_initial_scale (GimpDisplayShell *shell,
gdouble scale,
gint *display_width,
gint *display_height)
{
GimpImage *image;
GdkScreen *screen;
gint image_width;
gint image_height;
gint shell_width;
gint shell_height;
gint screen_width;
gint screen_height;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
image = gimp_display_get_image (shell->display);
screen = gtk_widget_get_screen (GTK_WIDGET (shell));
image_width = gimp_image_get_width (image);
image_height = gimp_image_get_height (image);
screen_width = gdk_screen_get_width (screen) * 0.75;
screen_height = gdk_screen_get_height (screen) * 0.75;
/* We need to zoom before we use SCALE[XY] */
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO, scale);
shell_width = SCALEX (shell, image_width);
shell_height = SCALEY (shell, image_height);
if (shell->display->config->initial_zoom_to_fit)
{
/* Limit to the size of the screen... */
if (shell_width > screen_width || shell_height > screen_height)
{
gdouble new_scale;
gdouble current = gimp_zoom_model_get_factor (shell->zoom);
new_scale = current * MIN (((gdouble) screen_height) / shell_height,
((gdouble) screen_width) / shell_width);
new_scale = gimp_zoom_model_zoom_step (GIMP_ZOOM_OUT, new_scale);
/* Since zooming out might skip a zoom step we zoom in
* again and test if we are small enough.
*/
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO,
gimp_zoom_model_zoom_step (GIMP_ZOOM_IN,
new_scale));
if (SCALEX (shell, image_width) > screen_width ||
SCALEY (shell, image_height) > screen_height)
gimp_zoom_model_zoom (shell->zoom, GIMP_ZOOM_TO, new_scale);
shell_width = SCALEX (shell, image_width);
shell_height = SCALEY (shell, image_height);
}
}
else
{
/* Set up size like above, but do not zoom to fit. Useful when
* working on large images.
*/
if (shell_width > screen_width)
shell_width = screen_width;
if (shell_height > screen_height)
shell_height = screen_height;
}
if (display_width)
*display_width = shell_width;
if (display_height)
*display_height = shell_height;
}
/**
* gimp_display_shell_push_zoom_focus_pointer_pos:
* @shell:
* @x:
* @y:
*
* When the zoom focus mechanism asks for the pointer the next time,
* use @x and @y.
**/
void
gimp_display_shell_push_zoom_focus_pointer_pos (GimpDisplayShell *shell,
gint x,
gint y)
{
GdkPoint *point = g_slice_new (GdkPoint);
point->x = x;
point->y = y;
g_queue_push_head (shell->zoom_focus_pointer_queue,
point);
}
/* private functions */
static void
gimp_display_shell_scale_get_screen_resolution (GimpDisplayShell *shell,
gdouble *xres,
gdouble *yres)
{
gdouble x, y;
if (shell->dot_for_dot)
{
gimp_image_get_resolution (gimp_display_get_image (shell->display),
&x, &y);
}
else
{
x = shell->monitor_xres;
y = shell->monitor_yres;
}
if (xres) *xres = x;
if (yres) *yres = y;
}
/**
* 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);
}
/**
* gimp_display_shell_calculate_scale_x_and_y:
* @shell:
* @scale:
* @scale_x:
* @scale_y:
*
**/
static void
gimp_display_shell_calculate_scale_x_and_y (GimpDisplayShell *shell,
gdouble scale,
gdouble *scale_x,
gdouble *scale_y)
{
GimpImage *image = gimp_display_get_image (shell->display);
gdouble xres;
gdouble yres;
gdouble screen_xres;
gdouble screen_yres;
gimp_image_get_resolution (image, &xres, &yres);
gimp_display_shell_scale_get_screen_resolution (shell,
&screen_xres, &screen_yres);
if (scale_x) *scale_x = scale * screen_xres / xres;
if (scale_y) *scale_y = scale * screen_yres / yres;
}
/**
* 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,
gdouble viewport_x,
gdouble viewport_y)
{
gdouble image_x, image_y;
gdouble new_viewport_x, new_viewport_y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (! shell->display)
return;
/* freeze the active tool */
gimp_display_shell_pause (shell);
gimp_display_shell_untransform_xy_f (shell,
viewport_x,
viewport_y,
&image_x,
&image_y);
/* Note that we never come here if we need to resize_windows_on_zoom
*/
gimp_display_shell_scale_by_values (shell,
scale,
shell->offset_x,
shell->offset_y,
FALSE);
gimp_display_shell_transform_xy_f (shell,
image_x,
image_y,
&new_viewport_x,
&new_viewport_y);
gimp_display_shell_scroll (shell,
new_viewport_x - viewport_x,
new_viewport_y - viewport_y);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
static gboolean
gimp_display_shell_scale_image_starts_to_fit (GimpDisplayShell *shell,
gdouble new_scale,
gdouble current_scale,
gboolean *vertically,
gboolean *horizontally)
{
gboolean vertically_dummy;
gboolean horizontally_dummy;
if (! vertically) vertically = &vertically_dummy;
if (! horizontally) horizontally = &horizontally_dummy;
/* The image can only start to fit if we zoom out */
if (new_scale > current_scale)
{
*vertically = FALSE;
*horizontally = FALSE;
}
else
{
gint current_scale_width;
gint current_scale_height;
gint new_scale_width;
gint new_scale_height;
gimp_display_shell_scale_get_image_size_for_scale (shell,
current_scale,
&current_scale_width,
&current_scale_height);
gimp_display_shell_scale_get_image_size_for_scale (shell,
new_scale,
&new_scale_width,
&new_scale_height);
*vertically = (current_scale_width > shell->disp_width &&
new_scale_width <= shell->disp_width);
*horizontally = (current_scale_height > shell->disp_height &&
new_scale_height <= shell->disp_height);
}
return *vertically && *horizontally;
}
static gboolean
gimp_display_shell_scale_image_stops_to_fit (GimpDisplayShell *shell,
gdouble new_scale,
gdouble current_scale,
gboolean *vertically,
gboolean *horizontally)
{
return gimp_display_shell_scale_image_starts_to_fit (shell,
current_scale,
new_scale,
vertically,
horizontally);
}
/**
* gimp_display_shell_scale_viewport_coord_almost_centered:
* @shell:
* @x:
* @y:
* @horizontally:
* @vertically:
*
**/
static gboolean
gimp_display_shell_scale_viewport_coord_almost_centered (GimpDisplayShell *shell,
gint x,
gint y,
gboolean *horizontally,
gboolean *vertically)
{
gboolean local_horizontally;
gboolean local_vertically;
gint center_x = shell->disp_width / 2;
gint center_y = shell->disp_height / 2;
local_horizontally = (x > center_x - ALMOST_CENTERED_THRESHOLD &&
x < center_x + ALMOST_CENTERED_THRESHOLD);
local_vertically = (y > center_y - ALMOST_CENTERED_THRESHOLD &&
y < center_y + ALMOST_CENTERED_THRESHOLD);
if (horizontally) *horizontally = local_horizontally;
if (vertically) *vertically = local_vertically;
return local_horizontally && local_vertically;
}
static void
gimp_display_shell_scale_get_image_center_viewport (GimpDisplayShell *shell,
gint *image_center_x,
gint *image_center_y)
{
gint sw, sh;
gimp_display_shell_scale_get_image_size (shell, &sw, &sh);
if (image_center_x) *image_center_x = -shell->offset_x + sw / 2;
if (image_center_y) *image_center_y = -shell->offset_y + sh / 2;
}
/**
* 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;
}
}
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