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0908e53148173099efb804dcd5bd0f2a3d754492
gimp/app/display/gimpdisplayshell-scale.c
Michael Natterer 0908e53148 app: use the new unit conversion functions 
and get rid of the brainfuck idea that app/ has to use _gimp_unit_foo()
functions, passing a gimp pointer. Instead, simply use the libgimpbase
API all over the place. Should we ever allow more than one gimp instance,
they will simply have to share one unit database.
2010-02-21 16:46:39 +01:00

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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/gimpdisplayconfig.h"
#include "core/gimp.h"
#include "core/gimpimage.h"
#include "gimpdisplay.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-draw.h"
#include "gimpdisplayshell-expose.h"
#include "gimpdisplayshell-scale.h"
#include "gimpdisplayshell-scroll.h"
#include "gimpdisplayshell-title.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_to (GimpDisplayShell *shell,
gdouble scale,
gint viewport_x,
gint 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,
gint *x,
gint *y,
GimpZoomFocus zoom_focus);
static gdouble img2real (GimpDisplayShell *shell,
gboolean xdir,
gdouble a);
/* public functions */
/**
* gimp_display_shell_update_scrollbars_and_rulers:
* @shell: the #GimpDisplayShell
*
**/
void
gimp_display_shell_update_scrollbars_and_rulers (GimpDisplayShell *shell)
{
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
gimp_display_shell_scale_update_scrollbars (shell);
gimp_display_shell_scale_update_rulers (shell);
}
/**
* gimp_display_shell_scale_update_scrollbars:
* @shell:
*
**/
void
gimp_display_shell_scale_update_scrollbars (GimpDisplayShell *shell)
{
GimpImage *image;
gint image_width;
gint image_height;
if (! shell->display)
return;
image = gimp_display_get_image (shell->display);
if (image)
{
image_width = gimp_image_get_width (image);
image_height = gimp_image_get_height (image);
}
else
{
image_width = shell->disp_width;
image_height = shell->disp_height;
}
/* Horizontal scrollbar */
g_object_freeze_notify (G_OBJECT (shell->hsbdata));
g_object_set (shell->hsbdata,
"value", (gdouble) shell->offset_x,
"page-size", (gdouble) shell->disp_width,
"page-increment", (gdouble) shell->disp_width / 2,
NULL);
gimp_display_shell_scroll_setup_hscrollbar (shell, shell->offset_x);
g_object_thaw_notify (G_OBJECT (shell->hsbdata)); /* emits "changed" */
/* Vertcal scrollbar */
g_object_freeze_notify (G_OBJECT (shell->vsbdata));
g_object_set (shell->vsbdata,
"value", (gdouble) shell->offset_y,
"page-size", (gdouble) shell->disp_height,
"page-increment", (gdouble) shell->disp_height / 2,
NULL);
gimp_display_shell_scroll_setup_vscrollbar (shell, shell->offset_y);
g_object_thaw_notify (G_OBJECT (shell->vsbdata)); /* emits "changed" */
}
/**
* gimp_display_shell_scale_update_rulers:
* @shell:
*
**/
void
gimp_display_shell_scale_update_rulers (GimpDisplayShell *shell)
{
GimpImage *image;
gint image_width;
gint image_height;
gdouble horizontal_lower;
gdouble horizontal_upper;
gdouble horizontal_max_size;
gdouble vertical_lower;
gdouble vertical_upper;
gdouble vertical_max_size;
if (! shell->display)
return;
image = gimp_display_get_image (shell->display);
if (image)
{
image_width = gimp_image_get_width (image);
image_height = gimp_image_get_height (image);
}
else
{
image_width = shell->disp_width;
image_height = shell->disp_height;
}
/* Initialize values */
horizontal_lower = 0;
vertical_lower = 0;
if (image)
{
horizontal_upper = img2real (shell, TRUE,
FUNSCALEX (shell, shell->disp_width));
horizontal_max_size = img2real (shell, TRUE,
MAX (image_width, image_height));
vertical_upper = img2real (shell, FALSE,
FUNSCALEY (shell, shell->disp_height));
vertical_max_size = img2real (shell, FALSE,
MAX (image_width, image_height));
}
else
{
horizontal_upper = image_width;
horizontal_max_size = MAX (image_width, image_height);
vertical_upper = image_height;
vertical_max_size = MAX (image_width, image_height);
}
/* Adjust due to scrolling */
if (image)
{
horizontal_lower += img2real (shell, TRUE,
FUNSCALEX (shell,
(gdouble) shell->offset_x));
horizontal_upper += img2real (shell, TRUE,
FUNSCALEX (shell,
(gdouble) shell->offset_x));
vertical_lower += img2real (shell, FALSE,
FUNSCALEY (shell,
(gdouble) shell->offset_y));
vertical_upper += img2real (shell, FALSE,
FUNSCALEY (shell,
(gdouble) shell->offset_y));
}
/* Finally setup the actual rulers */
gimp_ruler_set_range (GIMP_RULER (shell->hrule),
horizontal_lower,
horizontal_upper,
horizontal_max_size);
gimp_ruler_set_unit (GIMP_RULER (shell->hrule),
shell->unit);
gimp_ruler_set_range (GIMP_RULER (shell->vrule),
vertical_lower,
vertical_upper,
vertical_max_size);
gimp_ruler_set_unit (GIMP_RULER (shell->vrule),
shell->unit);
}
/**
* 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_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)
{
/* freeze the active tool */
gimp_display_shell_pause (shell);
shell->dot_for_dot = dot_for_dot;
gimp_display_shell_scale_changed (shell);
gimp_display_shell_scale_resize (shell,
shell->display->config->resize_windows_on_zoom,
FALSE);
/* re-enable the active tool */
gimp_display_shell_resume (shell);
}
}
void
gimp_display_shell_get_screen_resolution (GimpDisplayShell *shell,
gdouble *xres,
gdouble *yres)
{
gdouble x, y;
g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
if (shell->dot_for_dot)
{
gimp_image_get_resolution (shell->display->image, &x, &y);
}
else
{
x = shell->monitor_xres;
y = shell->monitor_yres;
}
if (xres) *xres = x;
if (yres) *yres = y;
}
/**
* 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));
}
}
}
/**
* 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_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_draw_get_scaled_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;
}
/**
* 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_handle_zoom_revert:
* @shell:
*
* Handle the updating of the Revert Zoom variables.
**/
void
gimp_display_shell_scale_handle_zoom_revert (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_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
* accomodate 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_handle_zoom_revert (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 accomodate 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);
}
/**
* gimp_display_shell_calculate_scale_x_and_y:
* @shell:
* @scale:
* @scale_x:
* @scale_y:
*
**/
void
gimp_display_shell_calculate_scale_x_and_y (GimpDisplayShell *shell,
gdouble scale,
gdouble *scale_x,
gdouble *scale_y)
{
GimpImage *image;
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);
g_return_if_fail (GIMP_IS_IMAGE (image));
gimp_image_get_resolution (image, &xres, &yres);
gimp_display_shell_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;
}
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_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,
FALSE);
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);
}
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_draw_get_scaled_image_size_for_scale (shell,
current_scale,
&current_scale_width,
&current_scale_height);
gimp_display_shell_draw_get_scaled_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_draw_get_scaled_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,
gint *x,
gint *y,
GimpZoomFocus zoom_focus)
{
GimpZoomFocus real_zoom_focus = zoom_focus;
gint image_center_x, image_center_y;
gint other_x, 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 */
{
GdkEvent *event;
gboolean event_looks_sane;
gboolean cursor_within_canvas;
gint canvas_pointer_x, canvas_pointer_y;
/* 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 shell (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 ();
event_looks_sane = ! event ||
gtk_get_event_widget (event) == shell->canvas ||
gtk_get_event_widget (event) == GTK_WIDGET (shell);
gtk_widget_get_pointer (shell->canvas,
&canvas_pointer_x,
&canvas_pointer_y);
cursor_within_canvas = canvas_pointer_x >= 0 &&
canvas_pointer_y >= 0 &&
canvas_pointer_x < shell->disp_width &&
canvas_pointer_y < shell->disp_height;
if (event_looks_sane && cursor_within_canvas)
{
other_x = canvas_pointer_x;
other_y = canvas_pointer_y;
}
else
{
other_x = shell->disp_width / 2;
other_y = shell->disp_height / 2;
}
}
/* Decide which one to use for each axis */
if (zoom_focus == GIMP_ZOOM_FOCUS_RETAIN_CENTERING_ELSE_BEST_GUESS)
{
gboolean centered;
centered = gimp_display_shell_scale_viewport_coord_almost_centered (shell,
image_center_x,
image_center_y,
NULL,
NULL);
real_zoom_focus = (centered ?
GIMP_ZOOM_FOCUS_IMAGE_CENTER :
GIMP_ZOOM_FOCUS_BEST_GUESS);
}
else
{
real_zoom_focus = zoom_focus;
}
switch (real_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;
}
}
/* scale image coord to realworld units (cm, inches, pixels)
*
* 27/Feb/1999 I tried inlining this, but the result was slightly
* slower (poorer cache locality, probably) -- austin
*/
static gdouble
img2real (GimpDisplayShell *shell,
gboolean xdir,
gdouble len)
{
gdouble xres;
gdouble yres;
gimp_image_get_resolution (gimp_display_get_image (shell->display),
&xres, &yres);
return gimp_pixels_to_units (len, gimp_unit_get_factor (shell->unit),
xdir ? xres : yres);
}
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