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gimp/app/core/gimpbrush.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 <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <gtk/gtk.h>
#ifdef G_OS_WIN32 /* gets defined by glib.h */
#include <io.h>
#endif
#ifndef _O_BINARY
#define _O_BINARY 0
#endif
#include <stdio.h>
#include "apptypes.h"
#include "brush_header.h"
#include "brush_scale.h"
#include "gimpbrush.h"
#include "gimprc.h"
#include "temp_buf.h"
/* this needs to go away */
#include "tools/paint_core.h"
#include "brush_scale.h"
#include "libgimp/gimpintl.h"
static void gimp_brush_class_init (GimpBrushClass *klass);
static void gimp_brush_init (GimpBrush *brush);
static void gimp_brush_destroy (GtkObject *object);
static TempBuf * gimp_brush_get_new_preview (GimpViewable *viewable,
gint width,
gint height);
static GimpBrush * gimp_brush_select_brush (PaintCore *paint_core);
static gboolean gimp_brush_want_null_motion (PaintCore *paint_core);
static GimpViewableClass *parent_class = NULL;
GtkType
gimp_brush_get_type (void)
{
static GtkType type = 0;
if (! type)
{
static const GtkTypeInfo info =
{
"GimpBrush",
sizeof (GimpBrush),
sizeof (GimpBrushClass),
(GtkClassInitFunc) gimp_brush_class_init,
(GtkObjectInitFunc) gimp_brush_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL
};
type = gtk_type_unique (GIMP_TYPE_VIEWABLE, &info);
}
return type;
}
static void
gimp_brush_class_init (GimpBrushClass *klass)
{
GtkObjectClass *object_class;
GimpViewableClass *viewable_class;
object_class = (GtkObjectClass *) klass;
viewable_class = (GimpViewableClass *) klass;
parent_class = gtk_type_class (GIMP_TYPE_VIEWABLE);
object_class->destroy = gimp_brush_destroy;
viewable_class->get_new_preview = gimp_brush_get_new_preview;
klass->select_brush = gimp_brush_select_brush;
klass->want_null_motion = gimp_brush_want_null_motion;
}
static void
gimp_brush_init (GimpBrush *brush)
{
brush->filename = NULL;
brush->spacing = 20;
brush->x_axis.x = 15.0;
brush->x_axis.y = 0.0;
brush->y_axis.x = 0.0;
brush->y_axis.y = 15.0;
brush->mask = NULL;
brush->pixmap = NULL;
}
static void
gimp_brush_destroy (GtkObject *object)
{
GimpBrush *brush;
brush = GIMP_BRUSH (object);
g_free (brush->filename);
if (brush->mask)
temp_buf_free (brush->mask);
if (GTK_OBJECT_CLASS (parent_class)->destroy)
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static TempBuf *
gimp_brush_get_new_preview (GimpViewable *viewable,
gint width,
gint height)
{
GimpBrush *brush;
gboolean scale = FALSE;
gint brush_width;
gint brush_height;
gint offset_x;
gint offset_y;
TempBuf *mask_buf = NULL;
TempBuf *pixmap_buf = NULL;
TempBuf *return_buf = NULL;
guchar white[3] = { 255, 255, 255 };
guchar *mask;
guchar *buf;
guchar *b;
guchar bg;
gint x, y;
brush = GIMP_BRUSH (viewable);
mask_buf = gimp_brush_get_mask (brush);
pixmap_buf = gimp_brush_get_pixmap (brush);
brush_width = mask_buf->width;
brush_height = mask_buf->height;
if (brush_width > width || brush_height > height)
{
gdouble ratio_x = (gdouble) brush_width / width;
gdouble ratio_y = (gdouble) brush_height / height;
brush_width = (gdouble) brush_width / MAX (ratio_x, ratio_y) + 0.5;
brush_height = (gdouble) brush_height / MAX (ratio_x, ratio_y) + 0.5;
mask_buf = brush_scale_mask (mask_buf, brush_width, brush_height);
if (pixmap_buf)
{
/* TODO: the scale function should scale the pixmap and the
* mask in one run
*/
pixmap_buf =
brush_scale_pixmap (pixmap_buf, brush_width, brush_height);
}
scale = TRUE;
}
offset_x = (width - brush_width) / 2;
offset_y = (height - brush_height) / 2;
return_buf = temp_buf_new (width, height, 3, 0, 0, white);
mask = temp_buf_data (mask_buf);
buf = temp_buf_data (return_buf);
b = buf + (offset_y * return_buf->width + offset_x) * return_buf->bytes;
if (pixmap_buf)
{
guchar *pixmap = temp_buf_data (pixmap_buf);
for (y = 0; y < brush_height; y++)
{
for (x = 0; x < brush_width ; x++)
{
bg = (255 - *mask);
*b++ = bg + (*mask * *pixmap++) / 255;
*b++ = bg + (*mask * *pixmap++) / 255;
*b++ = bg + (*mask * *pixmap++) / 255;
mask++;
}
b += (return_buf->width - brush_width) * return_buf->bytes;
}
}
else
{
for (y = 0; y < brush_height; y++)
{
for (x = 0; x < brush_width ; x++)
{
bg = 255 - *mask++;
*b++ = bg;
*b++ = bg;
*b++ = bg;
}
b += (return_buf->width - brush_width) * return_buf->bytes;
}
}
if (scale)
{
temp_buf_free (mask_buf);
if (pixmap_buf)
temp_buf_free (pixmap_buf);
}
return return_buf;
}
GimpBrush *
gimp_brush_load (const gchar *filename)
{
GimpBrush *brush;
gint fd;
g_return_val_if_fail (filename != NULL, NULL);
fd = open (filename, O_RDONLY | _O_BINARY);
if (fd == -1)
return NULL;
brush = gimp_brush_load_brush (fd, filename);
close (fd);
brush->filename = g_strdup (filename);
/* Swap the brush to disk (if we're being stingy with memory) */
if (stingy_memory_use)
{
temp_buf_swap (brush->mask);
if (brush->pixmap)
temp_buf_swap (brush->pixmap);
}
return brush;
}
static GimpBrush *
gimp_brush_select_brush (PaintCore *paint_core)
{
return paint_core->brush;
}
static gboolean
gimp_brush_want_null_motion (PaintCore *paint_core)
{
return TRUE;
}
TempBuf *
gimp_brush_get_mask (const GimpBrush *brush)
{
g_return_val_if_fail (brush != NULL, NULL);
g_return_val_if_fail (GIMP_IS_BRUSH (brush), NULL);
return brush->mask;
}
TempBuf *
gimp_brush_get_pixmap (const GimpBrush *brush)
{
g_return_val_if_fail (brush != NULL, NULL);
g_return_val_if_fail (GIMP_IS_BRUSH (brush), NULL);
return brush->pixmap;
}
gint
gimp_brush_get_spacing (const GimpBrush *brush)
{
g_return_val_if_fail (brush != NULL, 0);
g_return_val_if_fail (GIMP_IS_BRUSH (brush), 0);
return brush->spacing;
}
void
gimp_brush_set_spacing (GimpBrush *brush,
gint spacing)
{
g_return_if_fail (brush != NULL);
g_return_if_fail (GIMP_IS_BRUSH (brush));
brush->spacing = spacing;
}
GimpBrush *
gimp_brush_load_brush (gint fd,
const gchar *filename)
{
GimpBrush *brush;
gint bn_size;
BrushHeader header;
gchar *name;
gint i;
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (fd != -1, NULL);
/* Read in the header size */
if (read (fd, &header, sizeof (header)) != sizeof (header))
return NULL;
/* rearrange the bytes in each unsigned int */
header.header_size = g_ntohl (header.header_size);
header.version = g_ntohl (header.version);
header.width = g_ntohl (header.width);
header.height = g_ntohl (header.height);
header.bytes = g_ntohl (header.bytes);
header.magic_number = g_ntohl (header.magic_number);
header.spacing = g_ntohl (header.spacing);
/* Check for correct file format */
/* It looks as if version 1 did not have the same magic number. (neo) */
if (header.version != 1 &&
(header.magic_number != GBRUSH_MAGIC || header.version != 2))
{
g_message (_("Unknown brush format version #%d in \"%s\"."),
header.version, filename);
return NULL;
}
if (header.version == 1)
{
/* If this is a version 1 brush, set the fp back 8 bytes */
lseek (fd, -8, SEEK_CUR);
header.header_size += 8;
/* spacing is not defined in version 1 */
header.spacing = 25;
}
/* Read in the brush name */
if ((bn_size = (header.header_size - sizeof (header))))
{
name = g_new (gchar, bn_size);
if ((read (fd, name, bn_size)) < bn_size)
{
g_message (_("Error in GIMP brush file \"%s\"."), filename);
g_free (name);
return NULL;
}
}
else
{
name = g_strdup (_("Unnamed"));
}
switch (header.bytes)
{
case 1:
brush = GIMP_BRUSH (gtk_type_new (GIMP_TYPE_BRUSH));
brush->mask = temp_buf_new (header.width, header.height, 1,
0, 0, NULL);
if (read (fd,
temp_buf_data (brush->mask), header.width * header.height) <
header.width * header.height)
{
g_message (_("GIMP brush file appears to be truncated: \"%s\"."),
filename);
g_free (name);
gtk_object_unref (GTK_OBJECT (brush));
return NULL;
}
break;
case 4:
brush = GIMP_BRUSH (gtk_type_new (GIMP_TYPE_BRUSH));
brush->mask = temp_buf_new (header.width, header.height, 1, 0, 0, NULL);
brush->pixmap = temp_buf_new (header.width, header.height, 3, 0, 0, NULL);
for (i = 0; i < header.width * header.height; i++)
{
if (read (fd, temp_buf_data (brush->pixmap)
+ i * 3, 3) != 3 ||
read (fd, temp_buf_data (brush->mask) + i, 1) != 1)
{
g_message (_("GIMP brush file appears to be truncated: \"%s\"."),
filename);
g_free (name);
gtk_object_unref (GTK_OBJECT (brush));
return NULL;
}
}
break;
default:
g_message ("Unsupported brush depth: %d\n"
"in file \"%s\"\n"
"GIMP Brushes must be GRAY or RGBA",
header.bytes, filename);
g_free (name);
return NULL;
}
gimp_object_set_name (GIMP_OBJECT (brush), name);
g_free (name);
brush->spacing = header.spacing;
brush->x_axis.x = header.width / 2.0;
brush->x_axis.y = 0.0;
brush->y_axis.x = 0.0;
brush->y_axis.y = header.height / 2.0;
return brush;
}
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