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gimp/app/scale_tool.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 "appenv.h"
#include "drawable.h"
#include "gdisplay.h"
#include "gimage_mask.h"
#include "info_dialog.h"
#include "scale_tool.h"
#include "selection.h"
#include "tools.h"
#include "transform_core.h"
#include "transform_tool.h"
#include "undo.h"
#include "tile_manager_pvt.h"
#include "libgimp/gimpintl.h"
/* storage for information dialog fields */
static gchar orig_width_buf [MAX_INFO_BUF];
static gchar orig_height_buf [MAX_INFO_BUF];
static gfloat size_vals[2];
static gchar x_ratio_buf [MAX_INFO_BUF];
static gchar y_ratio_buf [MAX_INFO_BUF];
/* needed for original size unit update */
static GtkWidget *sizeentry;
/* forward function declarations */
static void * scale_tool_recalc (Tool *, void *);
static void scale_tool_motion (Tool *, void *);
static void scale_info_update (Tool *);
/* callback functions for the info dialog fields */
static void scale_size_changed (GtkWidget *w, gpointer data);
static void scale_unit_changed (GtkWidget *w, gpointer data);
void *
scale_tool_transform (Tool *tool,
gpointer gdisp_ptr,
int state)
{
GDisplay *gdisp;
TransformCore *transform_core;
GtkWidget *spinbutton;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
switch (state)
{
case INIT :
if (!transform_info)
{
transform_info = info_dialog_new (_("Scaling Information"));
info_dialog_add_label (transform_info, _("Original Width:"),
orig_width_buf);
info_dialog_add_label (transform_info, _("Height:"),
orig_height_buf);
spinbutton =
info_dialog_add_spinbutton (transform_info, _("Current Width:"),
NULL, -1, 1, 1, 10, 1, 1, 2, NULL, NULL);
sizeentry =
info_dialog_add_sizeentry (transform_info, _("Height:"),
size_vals, 1,
gdisp->dot_for_dot ?
UNIT_PIXEL : gdisp->gimage->unit, "%a",
TRUE, TRUE, FALSE,
GIMP_SIZE_ENTRY_UPDATE_SIZE,
scale_size_changed, tool);
gimp_size_entry_add_field (GIMP_SIZE_ENTRY (sizeentry),
GTK_SPIN_BUTTON (spinbutton), NULL);
gtk_signal_connect (GTK_OBJECT (sizeentry), "unit_changed",
scale_unit_changed, tool);
gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (sizeentry), 0,
1, 65536);
gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (sizeentry), 0,
gdisp->gimage->xresolution, FALSE);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (sizeentry), 0,
size_vals[0]);
gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (sizeentry), 1,
1, 65536);
gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (sizeentry), 1,
gdisp->gimage->yresolution, FALSE);
gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (sizeentry), 1,
size_vals[1]);
info_dialog_add_label (transform_info, _("Scale Ratio X:"),
x_ratio_buf);
info_dialog_add_label (transform_info, _("Y:"),
y_ratio_buf);
gtk_table_set_row_spacing (GTK_TABLE (transform_info->info_table),
1, 4);
gtk_table_set_row_spacing (GTK_TABLE (transform_info->info_table),
2, 0);
}
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), TRUE);
gimp_size_entry_set_size (GIMP_SIZE_ENTRY (sizeentry), 0,
0, transform_core->x2 - transform_core->x1);
gimp_size_entry_set_size (GIMP_SIZE_ENTRY (sizeentry), 1,
0, transform_core->y2- transform_core->y1);
transform_core->trans_info [X0] = (double) transform_core->x1;
transform_core->trans_info [Y0] = (double) transform_core->y1;
transform_core->trans_info [X1] = (double) transform_core->x2;
transform_core->trans_info [Y1] = (double) transform_core->y2;
return NULL;
break;
case MOTION :
scale_tool_motion (tool, gdisp_ptr);
return (scale_tool_recalc (tool, gdisp_ptr));
break;
case RECALC :
return (scale_tool_recalc (tool, gdisp_ptr));
break;
case FINISH :
gtk_widget_set_sensitive (GTK_WIDGET (transform_info->shell), FALSE);
return scale_tool_scale (gdisp->gimage,
gimage_active_drawable (gdisp->gimage),
gdisp,
transform_core->trans_info,
transform_core->original,
transform_tool_smoothing (),
transform_core->transform);
break;
}
return NULL;
}
Tool *
tools_new_scale_tool ()
{
Tool * tool;
TransformCore * private;
tool = transform_core_new (SCALE, INTERACTIVE);
private = tool->private;
/* set the rotation specific transformation attributes */
private->trans_func = scale_tool_transform;
private->trans_info[X0] = 0;
private->trans_info[Y0] = 0;
private->trans_info[X1] = 0;
private->trans_info[Y1] = 0;
/* assemble the transformation matrix */
gimp_matrix_identity (private->transform);
return tool;
}
void
tools_free_scale_tool (Tool *tool)
{
transform_core_free (tool);
}
static void
scale_info_update (Tool *tool)
{
GDisplay * gdisp;
TransformCore * transform_core;
double ratio_x, ratio_y;
int x1, y1, x2, y2, x3, y3, x4, y4;
GUnit unit;
float unit_factor;
gchar format_buf[16];
static GUnit label_unit = UNIT_PIXEL;
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
unit = gimp_size_entry_get_unit (GIMP_SIZE_ENTRY (sizeentry));;
/* Find original sizes */
x1 = transform_core->x1;
y1 = transform_core->y1;
x2 = transform_core->x2;
y2 = transform_core->y2;
if (unit != UNIT_PERCENT)
label_unit = unit;
unit_factor = gimp_unit_get_factor (label_unit);
if (label_unit) /* unit != UNIT_PIXEL */
{
g_snprintf (format_buf, 16, "%%.%df %s",
gimp_unit_get_digits (label_unit) + 1,
gimp_unit_get_symbol (label_unit));
g_snprintf (orig_width_buf, MAX_INFO_BUF, format_buf,
(x2 - x1) * unit_factor / gdisp->gimage->xresolution);
g_snprintf (orig_height_buf, MAX_INFO_BUF, format_buf,
(y2 - y1) * unit_factor / gdisp->gimage->yresolution);
}
else /* unit == UNIT_PIXEL */
{
g_snprintf (orig_width_buf, MAX_INFO_BUF, "%d", x2 - x1);
g_snprintf (orig_height_buf, MAX_INFO_BUF, "%d", y2 - y1);
}
/* Find current sizes */
x3 = (int) transform_core->trans_info [X0];
y3 = (int) transform_core->trans_info [Y0];
x4 = (int) transform_core->trans_info [X1];
y4 = (int) transform_core->trans_info [Y1];
size_vals[0] = x4 - x3;
size_vals[1] = y4 - y3;
ratio_x = ratio_y = 0.0;
if (x2 - x1)
ratio_x = (double) (x4 - x3) / (double) (x2 - x1);
if (y2 - y1)
ratio_y = (double) (y4 - y3) / (double) (y2 - y1);
g_snprintf (x_ratio_buf, MAX_INFO_BUF, "%0.2f", ratio_x);
g_snprintf (y_ratio_buf, MAX_INFO_BUF, "%0.2f", ratio_y);
info_dialog_update (transform_info);
info_dialog_popup (transform_info);
}
static void
scale_size_changed (GtkWidget *w,
gpointer data)
{
Tool *tool;
TransformCore *transform_core;
GDisplay *gdisp;
int width;
int height;
tool = (Tool *)data;
if (tool)
{
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
width = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (w), 0);
height = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (w), 1);
if ((width != (transform_core->trans_info[X1] -
transform_core->trans_info[X0])) ||
(height != (transform_core->trans_info[Y1] -
transform_core->trans_info[Y0])))
{
draw_core_pause (transform_core->core, tool);
transform_core->trans_info[X1] =
transform_core->trans_info[X0] + width;
transform_core->trans_info[Y1] =
transform_core->trans_info[Y0] + height;
scale_tool_recalc (tool, gdisp);
draw_core_resume (transform_core->core, tool);
}
}
}
static void
scale_unit_changed (GtkWidget *w,
gpointer data)
{
scale_info_update ((Tool*) data);
}
static void
scale_tool_motion (Tool *tool,
void *gdisp_ptr)
{
GDisplay * gdisp;
TransformCore * transform_core;
double ratio;
double *x1, *y1;
double *x2, *y2;
int w, h;
int dir_x, dir_y;
int diff_x, diff_y;
gdisp = (GDisplay *) gdisp_ptr;
transform_core = (TransformCore *) tool->private;
diff_x = transform_core->curx - transform_core->lastx;
diff_y = transform_core->cury - transform_core->lasty;
switch (transform_core->function)
{
case HANDLE_1 :
x1 = &transform_core->trans_info [X0];
y1 = &transform_core->trans_info [Y0];
x2 = &transform_core->trans_info [X1];
y2 = &transform_core->trans_info [Y1];
dir_x = dir_y = 1;
break;
case HANDLE_2 :
x1 = &transform_core->trans_info [X1];
y1 = &transform_core->trans_info [Y0];
x2 = &transform_core->trans_info [X0];
y2 = &transform_core->trans_info [Y1];
dir_x = -1;
dir_y = 1;
break;
case HANDLE_3 :
x1 = &transform_core->trans_info [X0];
y1 = &transform_core->trans_info [Y1];
x2 = &transform_core->trans_info [X1];
y2 = &transform_core->trans_info [Y0];
dir_x = 1;
dir_y = -1;
break;
case HANDLE_4 :
x1 = &transform_core->trans_info [X1];
y1 = &transform_core->trans_info [Y1];
x2 = &transform_core->trans_info [X0];
y2 = &transform_core->trans_info [Y0];
dir_x = dir_y = -1;
break;
default :
return;
}
/* if just the control key is down, affect only the height */
if (transform_core->state & GDK_CONTROL_MASK && ! (transform_core->state & GDK_SHIFT_MASK))
diff_x = 0;
/* if just the shift key is down, affect only the width */
else if (transform_core->state & GDK_SHIFT_MASK && ! (transform_core->state & GDK_CONTROL_MASK))
diff_y = 0;
*x1 += diff_x;
*y1 += diff_y;
if (dir_x > 0)
{
if (*x1 >= *x2) *x1 = *x2 - 1;
}
else
{
if (*x1 <= *x2) *x1 = *x2 + 1;
}
if (dir_y > 0)
{
if (*y1 >= *y2) *y1 = *y2 - 1;
}
else
{
if (*y1 <= *y2) *y1 = *y2 + 1;
}
/* if both the control key & shift keys are down, keep the aspect ratio intact */
if (transform_core->state & GDK_CONTROL_MASK && transform_core->state & GDK_SHIFT_MASK)
{
ratio = (double) (transform_core->x2 - transform_core->x1) /
(double) (transform_core->y2 - transform_core->y1);
w = ABS ((*x2 - *x1));
h = ABS ((*y2 - *y1));
if (w > h * ratio)
h = w / ratio;
else
w = h * ratio;
*y1 = *y2 - dir_y * h;
*x1 = *x2 - dir_x * w;
}
}
static void *
scale_tool_recalc (Tool *tool,
void *gdisp_ptr)
{
TransformCore * transform_core;
GDisplay * gdisp;
int x1, y1, x2, y2;
int diffx, diffy;
int cx, cy;
double scalex, scaley;
gdisp = (GDisplay *) tool->gdisp_ptr;
transform_core = (TransformCore *) tool->private;
x1 = (int) transform_core->trans_info [X0];
y1 = (int) transform_core->trans_info [Y0];
x2 = (int) transform_core->trans_info [X1];
y2 = (int) transform_core->trans_info [Y1];
scalex = scaley = 1.0;
if (transform_core->x2 - transform_core->x1)
scalex = (double) (x2 - x1) / (double) (transform_core->x2 - transform_core->x1);
if (transform_core->y2 - transform_core->y1)
scaley = (double) (y2 - y1) / (double) (transform_core->y2 - transform_core->y1);
switch (transform_core->function)
{
case HANDLE_1 :
cx = x2; cy = y2;
diffx = x2 - transform_core->x2;
diffy = y2 - transform_core->y2;
break;
case HANDLE_2 :
cx = x1; cy = y2;
diffx = x1 - transform_core->x1;
diffy = y2 - transform_core->y2;
break;
case HANDLE_3 :
cx = x2; cy = y1;
diffx = x2 - transform_core->x2;
diffy = y1 - transform_core->y1;
break;
case HANDLE_4 :
cx = x1; cy = y1;
diffx = x1 - transform_core->x1;
diffy = y1 - transform_core->y1;
break;
default :
cx = x1; cy = y1;
diffx = diffy = 0;
break;
}
/* assemble the transformation matrix */
gimp_matrix_identity (transform_core->transform);
gimp_matrix_translate (transform_core->transform, (double) -cx + diffx, (double) -cy + diffy);
gimp_matrix_scale (transform_core->transform, scalex, scaley);
gimp_matrix_translate (transform_core->transform, (double) cx, (double) cy);
/* transform the bounding box */
transform_bounding_box (tool);
/* update the information dialog */
scale_info_update (tool);
return (void *) 1;
}
void *
scale_tool_scale (GImage *gimage,
GimpDrawable *drawable,
GDisplay *gdisp,
double *trans_info,
TileManager *float_tiles,
int interpolation,
GimpMatrix matrix)
{
void *ret;
gimp_progress *progress;
progress = progress_start (gdisp, _("Scaling..."), FALSE, NULL, NULL);
ret = transform_core_do (gimage, drawable, float_tiles,
interpolation, matrix,
progress? progress_update_and_flush:NULL, progress);
if (progress)
progress_end (progress);
return ret;
}
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