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gimp/app/tools/gimpmagnifytool.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 "config.h"
#include <stdlib.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimptoolinfo.h"
#include "display/gimpdisplay.h"
#include "display/gimpdisplayshell.h"
#include "display/gimpdisplayshell-scale.h"
#include "gimpmagnifytool.h"
#include "tool_options.h"
#include "gimprc.h"
#include "libgimp/gimpintl.h"
typedef struct _MagnifyOptions MagnifyOptions;
struct _MagnifyOptions
{
GimpToolOptions tool_options;
/* gint resize_windows_on_zoom; (from gimprc) */
gint allow_resize_d;
GtkWidget *allow_resize_w;
GimpZoomType type;
GimpZoomType type_d;
GtkWidget *type_w[2];
};
/* magnify action functions */
static void gimp_magnify_tool_class_init (GimpMagnifyToolClass *klass);
static void gimp_magnify_tool_init (GimpMagnifyTool *tool);
static void gimp_magnify_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_magnify_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_magnify_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_magnify_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_magnify_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *gdisp);
static void gimp_magnify_tool_draw (GimpDrawTool *draw_tool);
static void zoom_in (gint *src,
gint *dest,
gint scale);
static void zoom_out (gint *src,
gint *dest,
gint scale);
static GimpToolOptions * magnify_options_new (GimpToolInfo *tool_info);
static void magnify_options_reset (GimpToolOptions *tool_options);
static GimpDrawToolClass *parent_class = NULL;
/* public functions */
void
gimp_magnify_tool_register (Gimp *gimp,
GimpToolRegisterCallback callback)
{
(* callback) (gimp,
GIMP_TYPE_MAGNIFY_TOOL,
magnify_options_new,
FALSE,
"gimp:magnify_tool",
_("Magnify"),
_("Zoom in & out"),
N_("/Tools/Magnify"), NULL,
NULL, "tools/magnify.html",
GIMP_STOCK_TOOL_ZOOM);
}
GType
gimp_magnify_tool_get_type (void)
{
static GType tool_type = 0;
if (! tool_type)
{
static const GTypeInfo tool_info =
{
sizeof (GimpMagnifyToolClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_magnify_tool_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpMagnifyTool),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_magnify_tool_init,
};
tool_type = g_type_register_static (GIMP_TYPE_DRAW_TOOL,
"GimpMagnifyTool",
&tool_info, 0);
}
return tool_type;
}
/* private functions */
static void
gimp_magnify_tool_class_init (GimpMagnifyToolClass *klass)
{
GimpToolClass *tool_class;
GimpDrawToolClass *draw_tool_class;
tool_class = GIMP_TOOL_CLASS (klass);
draw_tool_class = GIMP_DRAW_TOOL_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
tool_class->button_press = gimp_magnify_tool_button_press;
tool_class->button_release = gimp_magnify_tool_button_release;
tool_class->motion = gimp_magnify_tool_motion;
tool_class->modifier_key = gimp_magnify_tool_modifier_key;
tool_class->cursor_update = gimp_magnify_tool_cursor_update;
draw_tool_class->draw = gimp_magnify_tool_draw;
}
static void
gimp_magnify_tool_init (GimpMagnifyTool *magnify_tool)
{
GimpTool *tool;
tool = GIMP_TOOL (magnify_tool);
magnify_tool->x = 0;
magnify_tool->y = 0;
magnify_tool->w = 0;
magnify_tool->h = 0;
tool->tool_cursor = GIMP_ZOOM_TOOL_CURSOR;
tool->scroll_lock = TRUE; /* Disallow scrolling */
tool->auto_snap_to = FALSE; /* Don't snap to guides */
}
static void
gimp_magnify_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpMagnifyTool *magnify;
GimpDisplayShell *shell;
magnify = GIMP_MAGNIFY_TOOL (tool);
shell = GIMP_DISPLAY_SHELL (gdisp->shell);
magnify->x = coords->x;
magnify->y = coords->y;
magnify->w = 0;
magnify->h = 0;
tool->state = ACTIVE;
tool->gdisp = gdisp;
gdk_pointer_grab (shell->canvas->window, FALSE,
GDK_POINTER_MOTION_HINT_MASK |
GDK_BUTTON1_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL, NULL, time);
gimp_draw_tool_start (GIMP_DRAW_TOOL (tool), shell->canvas->window);
}
static void
gimp_magnify_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpMagnifyTool *magnify;
MagnifyOptions *options;
GimpDisplayShell *shell;
gint win_width, win_height;
gint width, height;
gint scalesrc, scaledest;
gint scale;
gint x1, y1, x2, y2, w, h;
magnify = GIMP_MAGNIFY_TOOL (tool);
options = (MagnifyOptions *) tool->tool_info->tool_options;
shell = GIMP_DISPLAY_SHELL (tool->gdisp->shell);
gdk_pointer_ungrab (time);
gdk_flush ();
gimp_draw_tool_stop (GIMP_DRAW_TOOL (tool));
tool->state = INACTIVE;
/* First take care of the case where the user "cancels" the action */
if (! (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 = shell->disp_width;
win_height = shell->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 = options->type;
switch (magnify->op)
{
case GIMP_ZOOM_IN:
zoom_in (&scalesrc, &scaledest, scale);
break;
case GIMP_ZOOM_OUT:
zoom_out (&scalesrc, &scaledest, scale);
break;
}
gdisp->scale = (scaledest << 8) + scalesrc;
shell->offset_x = ((scaledest * ((x1 + x2) / 2)) / scalesrc -
(win_width / 2));
shell->offset_y = ((scaledest * ((y1 + y2) / 2)) / scalesrc -
(win_height / 2));
/* resize the image */
gimp_display_shell_scale_resize (shell, gimprc.resize_windows_on_zoom,
TRUE);
}
}
static void
gimp_magnify_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *gdisp)
{
GimpMagnifyTool *magnify;
if (tool->state != ACTIVE)
return;
magnify = GIMP_MAGNIFY_TOOL (tool);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
magnify->w = (coords->x - magnify->x);
magnify->h = (coords->y - magnify->y);
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
static void
gimp_magnify_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *gdisp)
{
MagnifyOptions *options;
options = (MagnifyOptions *) tool->tool_info->tool_options;
if (key == GDK_CONTROL_MASK)
{
switch (options->type)
{
case GIMP_ZOOM_IN:
gimp_radio_group_set_active (GTK_RADIO_BUTTON (options->type_w[0]),
GINT_TO_POINTER (GIMP_ZOOM_OUT));
break;
case GIMP_ZOOM_OUT:
gimp_radio_group_set_active (GTK_RADIO_BUTTON (options->type_w[0]),
GINT_TO_POINTER (GIMP_ZOOM_IN));
break;
default:
break;
}
}
}
static void
gimp_magnify_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *gdisp)
{
MagnifyOptions *options;
GimpDisplayShell *shell;
options = (MagnifyOptions *) tool->tool_info->tool_options;
shell = GIMP_DISPLAY_SHELL (gdisp->shell);
if (options->type == GIMP_ZOOM_IN)
{
gimp_display_shell_install_tool_cursor (shell,
GIMP_ZOOM_CURSOR,
GIMP_ZOOM_TOOL_CURSOR,
GIMP_CURSOR_MODIFIER_PLUS);
}
else
{
gimp_display_shell_install_tool_cursor (shell,
GIMP_ZOOM_CURSOR,
GIMP_ZOOM_TOOL_CURSOR,
GIMP_CURSOR_MODIFIER_MINUS);
}
}
static void
gimp_magnify_tool_draw (GimpDrawTool *draw_tool)
{
GimpMagnifyTool *magnify;
magnify = GIMP_MAGNIFY_TOOL (draw_tool);
gimp_draw_tool_draw_rectangle (draw_tool,
FALSE,
magnify->x,
magnify->y,
magnify->w,
magnify->h,
FALSE);
}
/* 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 tool options functions */
static GimpToolOptions *
magnify_options_new (GimpToolInfo *tool_info)
{
MagnifyOptions *options;
GtkWidget *vbox;
GtkWidget *frame;
options = g_new0 (MagnifyOptions, 1);
tool_options_init ((GimpToolOptions *) options, tool_info);
((GimpToolOptions *) options)->reset_func = magnify_options_reset;
options->allow_resize_d = gimprc.resize_windows_on_zoom;
options->type_d = options->type = GIMP_ZOOM_IN;
/* 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_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->allow_resize_w),
gimprc.resize_windows_on_zoom);
gtk_box_pack_start (GTK_BOX (vbox), options->allow_resize_w,
FALSE, FALSE, 0);
gtk_widget_show (options->allow_resize_w);
g_signal_connect (G_OBJECT (options->allow_resize_w), "toggled",
G_CALLBACK (gimp_toggle_button_update),
&(gimprc.resize_windows_on_zoom));
/* tool toggle */
frame = gimp_radio_group_new2 (TRUE, _("Tool Toggle (<Ctrl>)"),
G_CALLBACK (gimp_radio_button_update),
&options->type,
GINT_TO_POINTER (options->type),
_("Zoom in"),
GINT_TO_POINTER (GIMP_ZOOM_IN),
&options->type_w[0],
_("Zoom out"),
GINT_TO_POINTER (GIMP_ZOOM_OUT),
&options->type_w[1],
NULL);
gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
return (GimpToolOptions *) options;
}
static void
magnify_options_reset (GimpToolOptions *tool_options)
{
MagnifyOptions *options;
options = (MagnifyOptions *) tool_options;
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (options->allow_resize_w),
options->allow_resize_d);
gimp_radio_group_set_active (GTK_RADIO_BUTTON (options->type_w[0]),
GINT_TO_POINTER (options->type_d));
}
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