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gimp/plug-ins/bmp/bmpwrite.c

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/* bmpwrite.c Writes Bitmap files. Even RLE encoded ones. */
/* (Windows (TM) doesn't read all of those, but who */
/* cares? ;-) */
/* I changed a few things over the time, so perhaps */
/* it dos now, but now there's no Windows left on */
/* my computer... */
/* Alexander.Schulz@stud.uni-karlsruhe.de */
/*
* 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <gtk/gtk.h>
#include <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "bmp.h"
#include "libgimp/stdplugins-intl.h"
static gint cur_progress = 0;
static gint max_progress = 0;
static gint encoded = 0;
static void WriteImage (FILE *f,
guchar *src,
gint width,
gint height,
gint encoded,
gint channels,
gint bpp,
gint spzeile,
gint MapSize);
static gboolean save_dialog (void);
static void
FromL (gint32 wert,
guchar *bopuffer)
{
bopuffer[0] = (wert & 0x000000ff)>>0x00;
bopuffer[1] = (wert & 0x0000ff00)>>0x08;
bopuffer[2] = (wert & 0x00ff0000)>>0x10;
bopuffer[3] = (wert & 0xff000000)>>0x18;
}
static void
FromS (gint16 wert,
guchar *bopuffer)
{
bopuffer[0] = (wert & 0x00ff)>>0x00;
bopuffer[1] = (wert & 0xff00)>>0x08;
}
static void
WriteColorMap (FILE *f,
gint red[MAXCOLORS],
gint green[MAXCOLORS],
gint blue[MAXCOLORS],
gint size)
{
gchar trgb[4];
gint i;
size /= 4;
trgb[3] = 0;
for (i = 0; i < size; i++)
{
trgb[0] = (guchar) blue[i];
trgb[1] = (guchar) green[i];
trgb[2] = (guchar) red[i];
Write (f, trgb, 4);
}
}
GimpPDBStatusType
WriteBMP (const gchar *filename,
gint32 image,
gint32 drawable_ID)
{
FILE *outfile;
gint Red[MAXCOLORS];
gint Green[MAXCOLORS];
gint Blue[MAXCOLORS];
guchar *cmap;
gint rows, cols, Spcols, channels, MapSize, SpZeile;
glong BitsPerPixel;
gint colors;
gchar *temp_buf;
guchar *pixels;
GimpPixelRgn pixel_rgn;
GimpDrawable *drawable;
GimpImageType drawable_type;
guchar puffer[50];
gint i;
/* first: can we save this image? */
drawable = gimp_drawable_get (drawable_ID);
drawable_type = gimp_drawable_type (drawable_ID);
gimp_pixel_rgn_init (&pixel_rgn, drawable,
0, 0, drawable->width, drawable->height, FALSE, FALSE);
if (gimp_drawable_has_alpha (drawable_ID))
{
g_message (_("Cannot save images with alpha channel."));
return GIMP_PDB_EXECUTION_ERROR;
}
/* We can save it. So what colors do we use? */
switch (drawable_type)
{
case GIMP_RGB_IMAGE:
colors = 0;
BitsPerPixel = 24;
MapSize = 0;
channels = 3;
break;
case GIMP_GRAY_IMAGE:
colors = 256;
BitsPerPixel = 8;
MapSize = 1024;
channels = 1;
for (i = 0; i < colors; i++)
{
Red[i] = i;
Green[i] = i;
Blue[i] = i;
}
break;
case GIMP_INDEXED_IMAGE:
cmap = gimp_image_get_colormap (image, &colors);
MapSize = 4 * colors;
channels = 1;
if (colors > 16)
BitsPerPixel = 8;
else if (colors > 2)
BitsPerPixel = 4;
else
BitsPerPixel = 1;
for (i = 0; i < colors; i++)
{
Red[i] = *cmap++;
Green[i] = *cmap++;
Blue[i] = *cmap++;
}
break;
default:
g_message (_("Cannot operate on unknown image types."));
return GIMP_PDB_EXECUTION_ERROR;
}
/* Perhaps someone wants RLE encoded Bitmaps */
encoded = 0;
if ((BitsPerPixel == 8 || BitsPerPixel == 4) && interactive_bmp)
{
if (! save_dialog ())
return GIMP_PDB_CANCEL;
}
/* Let's take some file */
outfile = fopen (filename, "wb");
if (!outfile)
{
g_message (_("Could not open '%s' for writing: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return GIMP_PDB_EXECUTION_ERROR;
}
/* fetch the image */
pixels = g_new (guchar, drawable->width * drawable->height * channels);
gimp_pixel_rgn_get_rect (&pixel_rgn, pixels,
0, 0, drawable->width, drawable->height);
/* And let's begin the progress */
temp_buf = g_strdup_printf (_("Saving '%s'..."),
gimp_filename_to_utf8 (filename));
gimp_progress_init (temp_buf);
g_free (temp_buf);
cur_progress = 0;
max_progress = drawable->height;
/* Now, we need some further information ... */
cols = drawable->width;
rows = drawable->height;
/* ... that we write to our headers. */
if ((BitsPerPixel != 24) &&
(cols % (8/BitsPerPixel)))
Spcols = (((cols / (8 / BitsPerPixel)) + 1) * (8 / BitsPerPixel));
else
Spcols = cols;
if ((((Spcols * BitsPerPixel) / 8) % 4) == 0)
SpZeile = ((Spcols * BitsPerPixel) / 8);
else
SpZeile = ((gint) (((Spcols * BitsPerPixel) / 8) / 4) + 1) * 4;
Bitmap_File_Head.bfSize = 0x36 + MapSize + (rows * SpZeile);
Bitmap_File_Head.zzHotX = 0;
Bitmap_File_Head.zzHotY = 0;
Bitmap_File_Head.bfOffs = 0x36 + MapSize;
Bitmap_File_Head.biSize = 40;
Bitmap_Head.biWidth = cols;
Bitmap_Head.biHeight = rows;
Bitmap_Head.biPlanes = 1;
Bitmap_Head.biBitCnt = BitsPerPixel;
if (encoded == 0)
Bitmap_Head.biCompr = 0;
else if (BitsPerPixel == 8)
Bitmap_Head.biCompr = 1;
else if (BitsPerPixel == 4)
Bitmap_Head.biCompr = 2;
else
Bitmap_Head.biCompr = 0;
Bitmap_Head.biSizeIm = SpZeile * rows;
{
gdouble xresolution;
gdouble yresolution;
gimp_image_get_resolution (image, &xresolution, &yresolution);
if (xresolution > GIMP_MIN_RESOLUTION &&
yresolution > GIMP_MIN_RESOLUTION)
{
/*
* xresolution and yresolution are in dots per inch.
* the BMP spec says that biXPels and biYPels are in
* pixels per meter as long ints (actually, "DWORDS"),
* so...
* n dots inch 100 cm m dots
* ------ * ------- * ------ = ------
* inch 2.54 cm m inch
*/
Bitmap_Head.biXPels = (long int) xresolution * 100.0 / 2.54;
Bitmap_Head.biYPels = (long int) yresolution * 100.0 / 2.54;
}
}
if (BitsPerPixel < 24)
Bitmap_Head.biClrUsed = colors;
else
Bitmap_Head.biClrUsed = 0;
Bitmap_Head.biClrImp = Bitmap_Head.biClrUsed;
#ifdef DEBUG
printf("\nSize: %u, Colors: %u, Bits: %u, Width: %u, Height: %u, Comp: %u, Zeile: %u\n",
(int)Bitmap_File_Head.bfSize,(int)Bitmap_Head.biClrUsed,Bitmap_Head.biBitCnt,(int)Bitmap_Head.biWidth,
(int)Bitmap_Head.biHeight, (int)Bitmap_Head.biCompr,SpZeile);
#endif
/* And now write the header and the colormap (if any) to disk */
Write (outfile, "BM", 2);
FromL (Bitmap_File_Head.bfSize, &puffer[0x00]);
FromS (Bitmap_File_Head.zzHotX, &puffer[0x04]);
FromS (Bitmap_File_Head.zzHotY, &puffer[0x06]);
FromL (Bitmap_File_Head.bfOffs, &puffer[0x08]);
FromL (Bitmap_File_Head.biSize, &puffer[0x0C]);
Write (outfile, puffer, 16);
FromL (Bitmap_Head.biWidth, &puffer[0x00]);
FromL (Bitmap_Head.biHeight, &puffer[0x04]);
FromS (Bitmap_Head.biPlanes, &puffer[0x08]);
FromS (Bitmap_Head.biBitCnt, &puffer[0x0A]);
FromL (Bitmap_Head.biCompr, &puffer[0x0C]);
FromL (Bitmap_Head.biSizeIm, &puffer[0x10]);
FromL (Bitmap_Head.biXPels, &puffer[0x14]);
FromL (Bitmap_Head.biYPels, &puffer[0x18]);
FromL (Bitmap_Head.biClrUsed, &puffer[0x1C]);
FromL (Bitmap_Head.biClrImp, &puffer[0x20]);
Write (outfile, puffer, 36);
WriteColorMap (outfile, Red, Green, Blue, MapSize);
/* After that is done, we write the image ... */
WriteImage (outfile,
pixels, cols, rows,
encoded, channels, BitsPerPixel, SpZeile, MapSize);
/* ... and exit normally */
fclose (outfile);
gimp_drawable_detach (drawable);
g_free (pixels);
return GIMP_PDB_SUCCESS;
}
static void
WriteImage (FILE *f,
guchar *src,
gint width,
gint height,
gint encoded,
gint channels,
gint bpp,
gint spzeile,
gint MapSize)
{
guchar buf[16]={0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0};
guchar puffer[8];
guchar *temp, v;
guchar *Zeile, *ketten;
gint xpos, ypos, i, j, rowstride, laenge, thiswidth;
gint breite, k;
guchar n;
xpos = 0;
rowstride = width * channels;
/* We'll begin with the 24 bit Bitmaps, they are easy :-) */
if (bpp == 24)
{
for (ypos = height - 1; ypos >= 0; ypos--) /* for each row */
{
for (i = 0; i < width; i++) /* for each pixel */
{
temp = src + (ypos * rowstride) + (xpos * channels);
buf[2] = (guchar) *temp;
temp++;
buf[1] = (guchar) *temp;
temp++;
buf[0] = (guchar) *temp;
xpos++;
Write (f, buf, 3);
}
Write (f, &buf[3], spzeile - (width * 3));
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
xpos = 0;
}
}
else
{
switch (encoded) /* now it gets more difficult */
{ /* uncompressed 1,4 and 8 bit */
case 0:
{
thiswidth = (width / (8 / bpp));
if (width % (8 / bpp))
thiswidth++;
for (ypos = height - 1; ypos >= 0; ypos--) /* for each row */
{
for (xpos = 0; xpos < width;) /* for each _byte_ */
{
v = 0;
for (i = 1;
(i <= (8 / bpp)) && (xpos < width);
i++, xpos++) /* for each pixel */
{
temp = src + (ypos * rowstride) + (xpos * channels);
v=v | ((guchar) *temp << (8 - (i * bpp)));
}
Write (f, &v, 1);
}
Write (f, &buf[3], spzeile - thiswidth);
xpos = 0;
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
break;
}
default:
{ /* Save RLE encoded file, quite difficult */
laenge = 0;
buf[12] = 0;
buf[13] = 1;
buf[14] = 0;
buf[15] = 0;
Zeile = (guchar *) g_malloc (width / (8 / bpp) + 10);
ketten = (guchar *) g_malloc (width / (8 / bpp) + 10);
for (ypos = height - 1; ypos >= 0; ypos--)
{ /* each row separately */
j = 0;
/* first copy the pixels to a buffer,
* making one byte from two 4bit pixels
*/
for (xpos = 0; xpos < width;)
{
v = 0;
for (i = 1;
(i <= (8 / bpp)) && (xpos < width);
i++, xpos++)
{ /* for each pixel */
temp = src + (ypos * rowstride) + (xpos * channels);
v = v | ((guchar) * temp << (8 - (i * bpp)));
}
Zeile[j++] = v;
}
breite = width / (8 / bpp);
if (width % (8 / bpp))
breite++;
/* then check for strings of equal bytes */
for (i = 0; i < breite;)
{
j = 0;
while ((i + j < breite) &&
(j < (255 / (8 / bpp))) &&
(Zeile[i + j] == Zeile[i]))
j++;
ketten[i] = j;
i += j;
}
/* then write the strings and the other pixels to the file */
for (i = 0; i < breite;)
{
if (ketten[i] < 3)
/* strings of different pixels ... */
{
j = 0;
while ((i + j < breite) &&
(j < (255 / (8 / bpp))) &&
(ketten[i + j] < 3))
j += ketten[i + j];
/* this can only happen if j jumps over
* the end with a 2 in ketten[i+j]
*/
if (j > (255 / (8 / bpp)))
j -= 2;
/* 00 01 and 00 02 are reserved */
if (j > 2)
{
Write (f, &buf[12], 1);
n = j * (8 / bpp);
if (n + i * (8 / bpp) > width)
n--;
Write (f, &n, 1);
laenge += 2;
Write (f, &Zeile[i], j);
laenge += j;
if ((j) % 2)
{
Write (f, &buf[12], 1);
laenge++;
}
}
else
{
for (k = i; k < i + j; k++)
{
n = (8 / bpp);
if (n + i * (8 / bpp) > width)
n--;
Write (f, &n, 1);
Write (f, &Zeile[k], 1);
/*printf("%i.#|",n); */
laenge += 2;
}
}
i += j;
}
else
/* strings of equal pixels */
{
n = ketten[i] * (8 / bpp);
if (n + i * (8 / bpp) > width)
n--;
Write (f, &n, 1);
Write (f, &Zeile[i], 1);
i += ketten[i];
laenge += 2;
}
}
Write (f, &buf[14], 2); /* End of row */
laenge += 2;
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
fseek (f, -2, SEEK_CUR); /* Overwrite last End of row ... */
Write (f, &buf[12], 2); /* ... with End of file */
fseek (f, 0x22, SEEK_SET); /* Write length of image */
FromL (laenge, puffer);
Write (f, puffer, 4);
fseek (f, 0x02, SEEK_SET); /* Write length of file */
laenge += (0x36 + MapSize);
FromL (laenge, puffer);
Write (f, puffer, 4);
g_free (ketten);
g_free (Zeile);
break;
}
}
}
gimp_progress_update (1);
}
static gboolean
save_dialog (void)
{
GtkWidget *dlg;
GtkWidget *toggle;
GtkWidget *vbox;
gboolean run;
dlg = gimp_dialog_new (_("Save as BMP"), "bmp",
NULL, 0,
gimp_standard_help_func, "file-bmp-save",
GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
GTK_STOCK_OK, GTK_RESPONSE_OK,
NULL);
gtk_dialog_set_alternative_button_order (GTK_DIALOG (dlg),
GTK_RESPONSE_OK,
GTK_RESPONSE_CANCEL,
-1);
vbox = gtk_vbox_new (FALSE, 12);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dlg)->vbox), vbox, TRUE, TRUE, 0);
gtk_widget_show (vbox);
toggle = gtk_check_button_new_with_mnemonic (_("_RLE encoded"));
gtk_box_pack_start (GTK_BOX (vbox), toggle, FALSE, FALSE, 0);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (toggle), encoded);
gtk_widget_show (toggle);
g_signal_connect (toggle, "toggled",
G_CALLBACK (gimp_toggle_button_update),
&encoded);
gtk_widget_show (dlg);
run = (gimp_dialog_run (GIMP_DIALOG (dlg)) == GTK_RESPONSE_OK);
gtk_widget_destroy (dlg);
return run;
}
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