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gimp/app/magnify.c

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/* The GIMP -- an 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <gdk/gdkkeysyms.h>
#include "appenv.h"
#include "cursorutil.h"
#include "draw_core.h"
#include "gdisplay.h"
#include "gimprc.h"
#include "gimpui.h"
#include "info_window.h"
#include "magnify.h"
#include "scale.h"
#include "config.h"
#include "libgimp/gimpintl.h"
/* the magnify structures */
typedef struct _Magnify Magnify;
struct _Magnify
{
DrawCore *core; /* Core select object */
gint x, y; /* upper left hand coordinate */
gint w, h; /* width and height */
gint op; /* magnify operation */
};
typedef struct _MagnifyOptions MagnifyOptions;
struct _MagnifyOptions
{
ToolOptions tool_options;
/* gint allow_resize_windows; (from gimprc) */
gint allow_resize_d;
GtkWidget *allow_resize_w;
ZoomType type;
ZoomType type_d;
GtkWidget *type_w[2];
};
/* the magnify tool options */
static MagnifyOptions *magnify_options = NULL;
/* magnify action functions */
static void magnify_button_press (Tool *, GdkEventButton *, gpointer);
static void magnify_button_release (Tool *, GdkEventButton *, gpointer);
static void magnify_motion (Tool *, GdkEventMotion *, gpointer);
static void magnify_modifier_update (Tool *, GdkEventKey *, gpointer);
static void magnify_cursor_update (Tool *, GdkEventMotion *, gpointer);
static void magnify_control (Tool *, ToolAction, gpointer);
/* magnify utility functions */
static void zoom_in (gint *src,
gint *dest,
gint scale);
static void zoom_out (gint *src,
gint *dest,
gint scale);
/* magnify tool options functions */
static void
magnify_options_reset (void)
{
MagnifyOptions *options = magnify_options;
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->allow_resize_w),
options->allow_resize_d);
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (options->type_w[options->type_d]), TRUE);
}
static MagnifyOptions *
magnify_options_new (void)
{
MagnifyOptions *options;
GtkWidget *vbox;
GtkWidget *frame;
/* the new magnify tool options structure */
options = g_new (MagnifyOptions, 1);
tool_options_init ((ToolOptions *) options,
_("Magnify Tool"),
magnify_options_reset);
options->allow_resize_d = allow_resize_windows;
options->type_d = options->type = ZOOMIN;
/* the main vbox */
vbox = options->tool_options.main_vbox;
/* the allow_resize toggle button */
options->allow_resize_w =
gtk_check_button_new_with_label (_("Allow Window Resizing"));
gtk_signal_connect (GTK_OBJECT (options->allow_resize_w), "toggled",
GTK_SIGNAL_FUNC (gimp_toggle_button_update),
&allow_resize_windows);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->allow_resize_w),
allow_resize_windows);
gtk_box_pack_start (GTK_BOX (vbox), options->allow_resize_w, FALSE, FALSE, 0);
gtk_widget_show (options->allow_resize_w);
/* tool toggle */
frame =
gimp_radio_group_new2 (TRUE, _("Tool Toggle"),
gimp_radio_button_update,
&options->type, (gpointer) options->type,
_("Zoom in"), (gpointer) ZOOMIN,
&options->type_w[0],
_("Zoom out"), (gpointer) ZOOMOUT,
&options->type_w[1],
NULL);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
return options;
}
/* magnify utility functions */
static void
zoom_in (gint *src,
gint *dest,
gint scale)
{
while (scale--)
{
if (*src > 1)
(*src)--;
else
if (*dest < 0x10)
(*dest)++;
}
}
static void
zoom_out (gint *src,
gint *dest,
gint scale)
{
while (scale--)
{
if (*dest > 1)
(*dest)--;
else
if (*src < 0x10)
(*src)++;
}
}
/* magnify action functions */
static void
magnify_button_press (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
Magnify *magnify;
gint x, y;
gdisp = (GDisplay *) gdisp_ptr;
magnify = (Magnify *) tool->private;
gdisplay_untransform_coords (gdisp, bevent->x, bevent->y, &x, &y, TRUE, 0);
magnify->x = x;
magnify->y = y;
magnify->w = 0;
magnify->h = 0;
gdk_pointer_grab (gdisp->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL, NULL, bevent->time);
tool->state = ACTIVE;
tool->gdisp_ptr = gdisp_ptr;
draw_core_start (magnify->core,
gdisp->canvas->window,
tool);
}
static void
magnify_button_release (Tool *tool,
GdkEventButton *bevent,
gpointer gdisp_ptr)
{
Magnify *magnify;
GDisplay *gdisp;
gint win_width, win_height;
gint width, height;
gint scalesrc, scaledest;
gint scale;
gint x1, y1, x2, y2, w, h;
gdisp = (GDisplay *) gdisp_ptr;
magnify = (Magnify *) tool->private;
gdk_pointer_ungrab (bevent->time);
gdk_flush ();
draw_core_stop (magnify->core, tool);
tool->state = INACTIVE;
/* First take care of the case where the user "cancels" the action */
if (! (bevent->state & GDK_BUTTON3_MASK))
{
x1 = (magnify->w < 0) ? magnify->x + magnify->w : magnify->x;
y1 = (magnify->h < 0) ? magnify->y + magnify->h : magnify->y;
w = (magnify->w < 0) ? -magnify->w : magnify->w;
h = (magnify->h < 0) ? -magnify->h : magnify->h;
x2 = x1 + w;
y2 = y1 + h;
/* these change the user zoom level, so should not be changed to
* the resolution-aware scale macros -- austin */
scalesrc = SCALESRC (gdisp);
scaledest = SCALEDEST (gdisp);
win_width = gdisp->disp_width;
win_height = gdisp->disp_height;
width = (win_width * scalesrc) / scaledest;
height = (win_height * scalesrc) / scaledest;
if (!w || !h)
scale = 1;
else
scale = MIN ((width / w), (height / h));
magnify->op = magnify_options->type;
switch (magnify->op)
{
case ZOOMIN:
zoom_in (&scalesrc, &scaledest, scale);
break;
case ZOOMOUT:
zoom_out (&scalesrc, &scaledest, scale);
break;
}
gdisp->scale = (scaledest << 8) + scalesrc;
gdisp->offset_x = (scaledest * ((x1 + x2) / 2)) / scalesrc -
(win_width / 2);
gdisp->offset_y = (scaledest * ((y1 + y2) / 2)) / scalesrc -
(win_height / 2);
/* resize the image */
resize_display (gdisp, allow_resize_windows, TRUE);
}
}
static void
magnify_motion (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
Magnify *magnify;
GDisplay *gdisp;
gint x, y;
if (tool->state != ACTIVE)
return;
gdisp = (GDisplay *) gdisp_ptr;
magnify = (Magnify *) tool->private;
draw_core_pause (magnify->core, tool);
gdisplay_untransform_coords (gdisp, mevent->x, mevent->y, &x, &y, TRUE, 0);
magnify->w = (x - magnify->x);
magnify->h = (y - magnify->y);
draw_core_resume (magnify->core, tool);
}
static void
magnify_modifier_update (Tool *tool,
GdkEventKey *kevent,
gpointer gdisp_ptr)
{
switch (kevent->keyval)
{
case GDK_Alt_L: case GDK_Alt_R:
break;
case GDK_Shift_L: case GDK_Shift_R:
break;
case GDK_Control_L: case GDK_Control_R:
if (magnify_options->type == ZOOMIN)
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (magnify_options->type_w[ZOOMOUT]), TRUE);
else
gtk_toggle_button_set_active
(GTK_TOGGLE_BUTTON (magnify_options->type_w[ZOOMIN]), TRUE);
break;
}
}
static void
magnify_cursor_update (Tool *tool,
GdkEventMotion *mevent,
gpointer gdisp_ptr)
{
GDisplay *gdisp;
gdisp = (GDisplay *) gdisp_ptr;
if (magnify_options->type == ZOOMIN)
{
gdisplay_install_tool_cursor (gdisp, GIMP_ZOOM_IN_CURSOR);
}
else
{
gdisplay_install_tool_cursor (gdisp, GIMP_ZOOM_OUT_CURSOR);
}
}
void
magnify_draw (Tool *tool)
{
GDisplay *gdisp;
Magnify *magnify;
gint x1, y1, x2, y2;
gdisp = (GDisplay *) tool->gdisp_ptr;
magnify = (Magnify *) tool->private;
x1 = MIN (magnify->x, magnify->x + magnify->w);
y1 = MIN (magnify->y, magnify->y + magnify->h);
x2 = MAX (magnify->x, magnify->x + magnify->w);
y2 = MAX (magnify->y, magnify->y + magnify->h);
gdisplay_transform_coords (gdisp, x1, y1, &x1, &y1, 0);
gdisplay_transform_coords (gdisp, x2, y2, &x2, &y2, 0);
gdk_draw_rectangle (magnify->core->win, magnify->core->gc, 0,
x1, y1, (x2 - x1), (y2 - y1));
}
static void
magnify_control (Tool *tool,
ToolAction action,
gpointer gdisp_ptr)
{
Magnify *magnify;
magnify = (Magnify *) tool->private;
switch (action)
{
case PAUSE:
draw_core_pause (magnify->core, tool);
break;
case RESUME:
draw_core_resume (magnify->core, tool);
break;
case HALT:
draw_core_stop (magnify->core, tool);
break;
default:
break;
}
}
Tool *
tools_new_magnify (void)
{
Tool *tool;
Magnify *private;
/* The tool options */
if (! magnify_options)
{
magnify_options = magnify_options_new ();
tools_register (MAGNIFY, (ToolOptions *) magnify_options);
}
tool = tools_new_tool (MAGNIFY);
private = g_new (Magnify, 1);
private->core = draw_core_new (magnify_draw);
private->x = private->y = 0;
private->w = private->h = 0;
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->auto_snap_to = FALSE; /* Don't snap to guides */
tool->private = (void *) private;
tool->button_press_func = magnify_button_press;
tool->button_release_func = magnify_button_release;
tool->motion_func = magnify_motion;
tool->modifier_key_func = magnify_modifier_update;
tool->cursor_update_func = magnify_cursor_update;
tool->control_func = magnify_control;
return tool;
}
void
tools_free_magnify (Tool *tool)
{
Magnify *magnify;
magnify = (Magnify *) tool->private;
draw_core_free (magnify->core);
g_free (magnify);
}
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