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gimp/plug-ins/file-bmp/bmp-read.c

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/* bmpread.c reads any bitmap I could get for testing */
/* Alexander.Schulz@stud.uni-karlsruhe.de */
/*
* GIMP - The GNU 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 3 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, see <http://www.gnu.org/licenses/>.
* ----------------------------------------------------------------------------
*/
#include "config.h"
#include <errno.h>
#include <string.h>
#include <glib/gstdio.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <libgimp/gimp.h>
#include <libgimp/gimppixbuf.h>
#include "bmp.h"
#include "libgimp/stdplugins-intl.h"
#if !defined(WIN32) || defined(__MINGW32__)
#define BI_RGB 0
#define BI_RLE8 1
#define BI_RLE4 2
#define BI_BITFIELDS 3
#endif
static gint32 ReadImage (FILE *fd,
gint width,
gint height,
guchar cmap[256][3],
gint ncols,
gint bpp,
gint compression,
gint rowbytes,
gboolean grey,
const Bitmap_Channel *masks,
GError **error);
static gint32
ToL (const guchar *puffer)
{
return (puffer[0] | puffer[1] << 8 | puffer[2] << 16 | puffer[3] << 24);
}
static gint16
ToS (const guchar *puffer)
{
return (puffer[0] | puffer[1] << 8);
}
static gboolean
ReadColorMap (FILE *fd,
guchar buffer[256][3],
gint number,
gint size,
gboolean *grey)
{
gint i;
guchar rgb[4];
*grey = (number > 2);
for (i = 0; i < number ; i++)
{
if (!ReadOK (fd, rgb, size))
{
g_message (_("Bad colormap"));
return FALSE;
}
/* Bitmap save the colors in another order! But change only once! */
buffer[i][0] = rgb[2];
buffer[i][1] = rgb[1];
buffer[i][2] = rgb[0];
*grey = ((*grey) && (rgb[0]==rgb[1]) && (rgb[1]==rgb[2]));
}
return TRUE;
}
static gboolean
ReadChannelMasks (guint32 *tmp, Bitmap_Channel *masks, guint channels)
{
guint32 mask;
gint i, nbits, offset, bit;
for (i = 0; i < channels; i++)
{
mask = tmp[i];
masks[i].mask = mask;
nbits = 0;
offset = -1;
for (bit = 0; bit < 32; bit++)
{
if (mask & 1)
{
nbits++;
if (offset == -1)
offset = bit;
}
mask = mask >> 1;
}
masks[i].shiftin = offset;
masks[i].max_value = (gfloat)((1<<(nbits))-1);
#ifdef DEBUG
g_print ("Channel %d mask %08x in %d max_val %d\n",
i, masks[i].mask, masks[i].shiftin, (gint)masks[i].max_value);
#endif
}
return TRUE;
}
gint32
ReadBMP (const gchar *name,
GError **error)
{
FILE *fd;
guchar buffer[64];
gint ColormapSize, rowbytes, Maps;
gboolean Grey = FALSE;
guchar ColorMap[256][3];
gint32 image_ID;
gchar magick[2];
Bitmap_Channel masks[4];
filename = name;
fd = g_fopen (filename, "rb");
if (!fd)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return -1;
}
gimp_progress_init_printf (_("Opening '%s'"),
gimp_filename_to_utf8 (name));
/* It is a File. Now is it a Bitmap? Read the shortest possible header */
if (!ReadOK (fd, magick, 2) || !(!strncmp (magick, "BA", 2) ||
!strncmp (magick, "BM", 2) || !strncmp (magick, "IC", 2) ||
!strncmp (magick, "PI", 2) || !strncmp (magick, "CI", 2) ||
!strncmp (magick, "CP", 2)))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
while (!strncmp (magick, "BA", 2))
{
if (!ReadOK (fd, buffer, 12))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
if (!ReadOK (fd, magick, 2))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
}
if (!ReadOK (fd, buffer, 12))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
/* bring them to the right byteorder. Not too nice, but it should work */
Bitmap_File_Head.bfSize = ToL (&buffer[0x00]);
Bitmap_File_Head.zzHotX = ToS (&buffer[0x04]);
Bitmap_File_Head.zzHotY = ToS (&buffer[0x06]);
Bitmap_File_Head.bfOffs = ToL (&buffer[0x08]);
if (!ReadOK (fd, buffer, 4))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
Bitmap_File_Head.biSize = ToL (&buffer[0x00]);
/* What kind of bitmap is it? */
if (Bitmap_File_Head.biSize == 12) /* OS/2 1.x ? */
{
if (!ReadOK (fd, buffer, 8))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading BMP file header from '%s'"),
gimp_filename_to_utf8 (filename));
return -1;
}
Bitmap_Head.biWidth = ToS (&buffer[0x00]); /* 12 */
Bitmap_Head.biHeight = ToS (&buffer[0x02]); /* 14 */
Bitmap_Head.biPlanes = ToS (&buffer[0x04]); /* 16 */
Bitmap_Head.biBitCnt = ToS (&buffer[0x06]); /* 18 */
Bitmap_Head.biCompr = 0;
Bitmap_Head.biSizeIm = 0;
Bitmap_Head.biXPels = Bitmap_Head.biYPels = 0;
Bitmap_Head.biClrUsed = 0;
Bitmap_Head.biClrImp = 0;
Bitmap_Head.masks[0] = 0;
Bitmap_Head.masks[1] = 0;
Bitmap_Head.masks[2] = 0;
Bitmap_Head.masks[3] = 0;
memset(masks, 0, sizeof(masks));
Maps = 3;
}
else if (Bitmap_File_Head.biSize == 40) /* Windows 3.x */
{
if (!ReadOK (fd, buffer, 36))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading BMP file header from '%s'"),
gimp_filename_to_utf8 (filename));
return -1;
}
Bitmap_Head.biWidth = ToL (&buffer[0x00]); /* 12 */
Bitmap_Head.biHeight = ToL (&buffer[0x04]); /* 16 */
Bitmap_Head.biPlanes = ToS (&buffer[0x08]); /* 1A */
Bitmap_Head.biBitCnt = ToS (&buffer[0x0A]); /* 1C */
Bitmap_Head.biCompr = ToL (&buffer[0x0C]); /* 1E */
Bitmap_Head.biSizeIm = ToL (&buffer[0x10]); /* 22 */
Bitmap_Head.biXPels = ToL (&buffer[0x14]); /* 26 */
Bitmap_Head.biYPels = ToL (&buffer[0x18]); /* 2A */
Bitmap_Head.biClrUsed = ToL (&buffer[0x1C]); /* 2E */
Bitmap_Head.biClrImp = ToL (&buffer[0x20]); /* 32 */
Bitmap_Head.masks[0] = 0;
Bitmap_Head.masks[1] = 0;
Bitmap_Head.masks[2] = 0;
Bitmap_Head.masks[3] = 0;
Maps = 4;
memset(masks, 0, sizeof(masks));
if (Bitmap_Head.biCompr == BI_BITFIELDS)
{
if (!ReadOK (fd, buffer, 3 * sizeof (guint32)))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading BMP file header from '%s'"),
gimp_filename_to_utf8 (filename));
return -1;
}
Bitmap_Head.masks[0] = ToL(&buffer[0x00]);
Bitmap_Head.masks[1] = ToL(&buffer[0x04]);
Bitmap_Head.masks[2] = ToL(&buffer[0x08]);
ReadChannelMasks (&Bitmap_Head.masks[0], masks, 3);
}
else
switch (Bitmap_Head.biBitCnt)
{
case 32:
masks[0].mask = 0x00ff0000;
masks[0].shiftin = 16;
masks[0].max_value= (gfloat)255.0;
masks[1].mask = 0x0000ff00;
masks[1].shiftin = 8;
masks[1].max_value= (gfloat)255.0;
masks[2].mask = 0x000000ff;
masks[2].shiftin = 0;
masks[2].max_value= (gfloat)255.0;
masks[3].mask = 0xff000000;
masks[3].shiftin = 24;
masks[3].max_value= (gfloat)255.0;
break;
case 24:
masks[0].mask = 0xff0000;
masks[0].shiftin = 16;
masks[0].max_value= (gfloat)255.0;
masks[1].mask = 0x00ff00;
masks[1].shiftin = 8;
masks[1].max_value= (gfloat)255.0;
masks[2].mask = 0x0000ff;
masks[2].shiftin = 0;
masks[2].max_value= (gfloat)255.0;
masks[3].mask = 0x0;
masks[3].shiftin = 0;
masks[3].max_value= (gfloat)0.0;
break;
case 16:
masks[0].mask = 0x7c00;
masks[0].shiftin = 10;
masks[0].max_value= (gfloat)31.0;
masks[1].mask = 0x03e0;
masks[1].shiftin = 5;
masks[1].max_value= (gfloat)31.0;
masks[2].mask = 0x001f;
masks[2].shiftin = 0;
masks[2].max_value= (gfloat)31.0;
masks[3].mask = 0x0;
masks[3].shiftin = 0;
masks[3].max_value= (gfloat)0.0;
break;
default:
break;
}
}
else if (Bitmap_File_Head.biSize >= 56 && Bitmap_File_Head.biSize <= 64)
/* enhanced Windows format with bit masks */
{
if (!ReadOK (fd, buffer, Bitmap_File_Head.biSize - 4))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading BMP file header from '%s'"),
gimp_filename_to_utf8 (filename));
return -1;
}
Bitmap_Head.biWidth =ToL (&buffer[0x00]); /* 12 */
Bitmap_Head.biHeight =ToL (&buffer[0x04]); /* 16 */
Bitmap_Head.biPlanes =ToS (&buffer[0x08]); /* 1A */
Bitmap_Head.biBitCnt =ToS (&buffer[0x0A]); /* 1C */
Bitmap_Head.biCompr =ToL (&buffer[0x0C]); /* 1E */
Bitmap_Head.biSizeIm =ToL (&buffer[0x10]); /* 22 */
Bitmap_Head.biXPels =ToL (&buffer[0x14]); /* 26 */
Bitmap_Head.biYPels =ToL (&buffer[0x18]); /* 2A */
Bitmap_Head.biClrUsed =ToL (&buffer[0x1C]); /* 2E */
Bitmap_Head.biClrImp =ToL (&buffer[0x20]); /* 32 */
Bitmap_Head.masks[0] =ToL (&buffer[0x24]); /* 36 */
Bitmap_Head.masks[1] =ToL (&buffer[0x28]); /* 3A */
Bitmap_Head.masks[2] =ToL (&buffer[0x2C]); /* 3E */
Bitmap_Head.masks[3] =ToL (&buffer[0x30]); /* 42 */
Maps = 4;
ReadChannelMasks (&Bitmap_Head.masks[0], masks, 4);
}
else
{
GdkPixbuf* pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
if (pixbuf)
{
gint32 layer_ID;
image_ID = gimp_image_new (gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf),
GIMP_RGB);
layer_ID = gimp_layer_new_from_pixbuf (image_ID, _("Background"),
pixbuf,
100.,
GIMP_NORMAL_MODE, 0, 0);
g_object_unref (pixbuf);
gimp_image_set_filename (image_ID, filename);
gimp_image_insert_layer (image_ID, layer_ID, -1, -1);
return image_ID;
}
else
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading BMP file header from '%s'"),
gimp_filename_to_utf8 (filename));
return -1;
}
}
/* Valid bit depth is 1, 4, 8, 16, 24, 32 */
/* 16 is awful, we should probably shoot whoever invented it */
switch (Bitmap_Head.biBitCnt)
{
case 1:
case 2:
case 4:
case 8:
case 16:
case 24:
case 32:
break;
default:
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
/* There should be some colors used! */
ColormapSize =
(Bitmap_File_Head.bfOffs - Bitmap_File_Head.biSize - 14) / Maps;
if ((Bitmap_Head.biClrUsed == 0) && (Bitmap_Head.biBitCnt <= 8))
ColormapSize = Bitmap_Head.biClrUsed = 1 << Bitmap_Head.biBitCnt;
if (ColormapSize > 256)
ColormapSize = 256;
/* Sanity checks */
if (Bitmap_Head.biHeight == 0 || Bitmap_Head.biWidth == 0)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
/* biHeight may be negative, but G_MININT32 is dangerous because:
G_MININT32 == -(G_MININT32) */
if (Bitmap_Head.biWidth < 0 ||
Bitmap_Head.biHeight == G_MININT32)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
if (Bitmap_Head.biPlanes != 1)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
if (Bitmap_Head.biClrUsed > 256)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
/* protect against integer overflows caused by malicious BMPs */
/* use divisions in comparisons to avoid type overflows */
if (((guint64) Bitmap_Head.biWidth) > G_MAXINT32 / Bitmap_Head.biBitCnt ||
((guint64) Bitmap_Head.biWidth) > (G_MAXINT32 / ABS (Bitmap_Head.biHeight)) / 4)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
gimp_filename_to_utf8 (filename));
return -1;
}
/* Windows and OS/2 declare filler so that rows are a multiple of
* word length (32 bits == 4 bytes)
*/
rowbytes= ((Bitmap_Head.biWidth * Bitmap_Head.biBitCnt - 1) / 32) * 4 + 4;
#ifdef DEBUG
printf ("\nSize: %u, Colors: %u, Bits: %u, Width: %u, Height: %u, "
"Comp: %u, Zeile: %u\n",
Bitmap_File_Head.bfSize,
Bitmap_Head.biClrUsed,
Bitmap_Head.biBitCnt,
Bitmap_Head.biWidth,
Bitmap_Head.biHeight,
Bitmap_Head.biCompr,
rowbytes);
#endif
if (Bitmap_Head.biBitCnt <= 8)
{
#ifdef DEBUG
printf ("Colormap read\n");
#endif
/* Get the Colormap */
if (!ReadColorMap (fd, ColorMap, ColormapSize, Maps, &Grey))
return -1;
}
fseek (fd, Bitmap_File_Head.bfOffs, SEEK_SET);
/* Get the Image and return the ID or -1 on error*/
image_ID = ReadImage (fd,
Bitmap_Head.biWidth,
ABS (Bitmap_Head.biHeight),
ColorMap,
Bitmap_Head.biClrUsed,
Bitmap_Head.biBitCnt,
Bitmap_Head.biCompr,
rowbytes,
Grey,
masks,
error);
if (image_ID < 0)
return -1;
if (Bitmap_Head.biXPels > 0 && Bitmap_Head.biYPels > 0)
{
/* Fixed up from scott@asofyet's changes last year, njl195 */
gdouble xresolution;
gdouble yresolution;
/* I don't agree with scott's feeling that Gimp should be
* trying to "fix" metric resolution translations, in the
* long term Gimp should be SI (metric) anyway, but we
* haven't told the Americans that yet */
xresolution = Bitmap_Head.biXPels * 0.0254;
yresolution = Bitmap_Head.biYPels * 0.0254;
gimp_image_set_resolution (image_ID, xresolution, yresolution);
}
if (Bitmap_Head.biHeight < 0)
gimp_image_flip (image_ID, GIMP_ORIENTATION_VERTICAL);
return image_ID;
}
static gint32
ReadImage (FILE *fd,
gint width,
gint height,
guchar cmap[256][3],
gint ncols,
gint bpp,
gint compression,
gint rowbytes,
gboolean grey,
const Bitmap_Channel *masks,
GError **error)
{
guchar v, n;
GimpPixelRgn pixel_rgn;
gint xpos = 0;
gint ypos = 0;
gint32 image;
gint32 layer;
GimpDrawable *drawable;
guchar *dest, *temp, *buffer;
guchar gimp_cmap[768];
gushort rgb;
glong rowstride, channels;
gint i, i_max, j, cur_progress, max_progress;
gint total_bytes_read;
GimpImageBaseType base_type;
GimpImageType image_type;
guint32 px32;
if (! (compression == BI_RGB ||
(bpp == 8 && compression == BI_RLE8) ||
(bpp == 4 && compression == BI_RLE4) ||
(bpp == 16 && compression == BI_BITFIELDS) ||
(bpp == 32 && compression == BI_BITFIELDS)))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
"%s",
_("Unrecognized or invalid BMP compression format."));
return -1;
}
/* Make a new image in GIMP */
switch (bpp)
{
case 32:
case 24:
case 16:
base_type = GIMP_RGB;
if (masks[3].mask != 0)
{
image_type = GIMP_RGBA_IMAGE;
channels = 4;
}
else
{
image_type = GIMP_RGB_IMAGE;
channels = 3;
}
break;
case 8:
case 4:
case 1:
if (grey)
{
base_type = GIMP_GRAY;
image_type = GIMP_GRAY_IMAGE;
}
else
{
base_type = GIMP_INDEXED;
image_type = GIMP_INDEXED_IMAGE;
}
channels = 1;
break;
default:
g_message (_("Unsupported or invalid bitdepth."));
return -1;
}
if ((width < 0) || (width > GIMP_MAX_IMAGE_SIZE))
{
g_message (_("Unsupported or invalid image width: %d"), width);
return -1;
}
if ((height < 0) || (height > GIMP_MAX_IMAGE_SIZE))
{
g_message (_("Unsupported or invalid image height: %d"), height);
return -1;
}
image = gimp_image_new (width, height, base_type);
layer = gimp_layer_new (image, _("Background"),
width, height,
image_type, 100, GIMP_NORMAL_MODE);
gimp_image_set_filename (image, filename);
gimp_image_insert_layer (image, layer, -1, 0);
drawable = gimp_drawable_get (layer);
/* use g_malloc0 to initialize the dest buffer so that unspecified
pixels in RLE bitmaps show up as the zeroth element in the palette.
*/
dest = g_malloc0 (drawable->width * drawable->height * channels);
buffer = g_malloc (rowbytes);
rowstride = drawable->width * channels;
ypos = height - 1; /* Bitmaps begin in the lower left corner */
cur_progress = 0;
max_progress = height;
switch (bpp)
{
case 32:
{
while (ReadOK (fd, buffer, rowbytes))
{
temp = dest + (ypos * rowstride);
for (xpos= 0; xpos < width; ++xpos)
{
px32 = ToL(&buffer[xpos*4]);
*(temp++)= (guchar)((px32 & masks[0].mask) >> masks[0].shiftin);
*(temp++)= (guchar)((px32 & masks[1].mask) >> masks[1].shiftin);
*(temp++)= (guchar)((px32 & masks[2].mask) >> masks[2].shiftin);
if (channels > 3)
*(temp++)= (guchar)((px32 & masks[3].mask) >> masks[3].shiftin);
}
if (ypos == 0)
break;
--ypos; /* next line */
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
if (channels == 4)
{
gboolean has_alpha = FALSE;
/* at least one pixel should have nonzero alpha */
for (ypos = 0; ypos < height; ypos++)
{
temp = dest + (ypos * rowstride);
for (xpos = 0; xpos < width; xpos++)
{
if (temp[3])
{
has_alpha = TRUE;
break;
}
temp += 4;
}
if (has_alpha)
break;
}
/* workaround unwanted behaviour when all alpha pixels are zero */
if (!has_alpha)
{
for (ypos = 0; ypos < height; ypos++)
{
temp = dest + (ypos * rowstride);
for (xpos = 0; xpos < width; xpos++)
{
temp[3] = 255;
temp += 4;
}
}
}
}
}
break;
case 24:
{
while (ReadOK (fd, buffer, rowbytes))
{
temp = dest + (ypos * rowstride);
for (xpos= 0; xpos < width; ++xpos)
{
*(temp++)= buffer[xpos * 3 + 2];
*(temp++)= buffer[xpos * 3 + 1];
*(temp++)= buffer[xpos * 3];
}
if (ypos == 0)
break;
--ypos; /* next line */
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
}
break;
case 16:
{
while (ReadOK (fd, buffer, rowbytes))
{
temp = dest + (ypos * rowstride);
for (xpos= 0; xpos < width; ++xpos)
{
rgb= ToS(&buffer[xpos * 2]);
*(temp++) = (guchar)(((rgb & masks[0].mask) >> masks[0].shiftin) * 255.0 / masks[0].max_value + 0.5);
*(temp++) = (guchar)(((rgb & masks[1].mask) >> masks[1].shiftin) * 255.0 / masks[1].max_value + 0.5);
*(temp++) = (guchar)(((rgb & masks[2].mask) >> masks[2].shiftin) * 255.0 / masks[2].max_value + 0.5);
if (channels > 3)
*(temp++) = (guchar)(((rgb & masks[3].mask) >> masks[3].shiftin) * 255.0 / masks[3].max_value + 0.5);
}
if (ypos == 0)
break;
--ypos; /* next line */
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
}
break;
case 8:
case 4:
case 1:
{
if (compression == 0)
/* no compression */
{
while (ReadOK (fd, &v, 1))
{
for (i = 1; (i <= (8 / bpp)) && (xpos < width); i++, xpos++)
{
temp = dest + (ypos * rowstride) + (xpos * channels);
*temp=( v & ( ((1<<bpp)-1) << (8-(i*bpp)) ) ) >> (8-(i*bpp));
if (grey)
*temp = cmap[*temp][0];
}
if (xpos == width)
{
fread(buffer, rowbytes - 1 - (width * bpp - 1) / 8, 1, fd);
if (ypos == 0)
break;
ypos--;
xpos = 0;
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
if (ypos < 0)
break;
}
break;
}
else
{
/* compressed image (either RLE8 or RLE4) */
while (ypos >= 0 && xpos <= width)
{
if (!ReadOK (fd, buffer, 2))
{
g_message (_("The bitmap ends unexpectedly."));
break;
}
if ((guchar) buffer[0] != 0)
/* Count + Color - record */
{
/* encoded mode run -
buffer[0] == run_length
buffer[1] == pixel data
*/
for (j = 0;
((guchar) j < (guchar) buffer[0]) && (xpos < width);)
{
#ifdef DEBUG2
printf("%u %u | ",xpos,width);
#endif
for (i = 1;
((i <= (8 / bpp)) &&
(xpos < width) &&
((guchar) j < (unsigned char) buffer[0]));
i++, xpos++, j++)
{
temp = dest + (ypos * rowstride) + (xpos * channels);
*temp = (buffer[1] &
(((1<<bpp)-1) << (8 - (i * bpp)))) >> (8 - (i * bpp));
if (grey)
*temp = cmap[*temp][0];
}
}
}
if (((guchar) buffer[0] == 0) && ((guchar) buffer[1] > 2))
/* uncompressed record */
{
n = buffer[1];
total_bytes_read = 0;
for (j = 0; j < n; j += (8 / bpp))
{
/* read the next byte in the record */
if (!ReadOK (fd, &v, 1))
{
g_message (_("The bitmap ends unexpectedly."));
break;
}
total_bytes_read++;
/* read all pixels from that byte */
i_max = 8 / bpp;
if (n - j < i_max)
{
i_max = n - j;
}
i = 1;
while ((i <= i_max) && (xpos < width))
{
temp =
dest + (ypos * rowstride) + (xpos * channels);
*temp = (v >> (8-(i*bpp))) & ((1<<bpp)-1);
if (grey)
*temp = cmap[*temp][0];
i++;
xpos++;
}
}
/* absolute mode runs are padded to 16-bit alignment */
if (total_bytes_read % 2)
fread(&v, 1, 1, fd);
}
if (((guchar) buffer[0] == 0) && ((guchar) buffer[1]==0))
/* Line end */
{
ypos--;
xpos = 0;
cur_progress++;
if ((cur_progress % 5) == 0)
gimp_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
if (((guchar) buffer[0]==0) && ((guchar) buffer[1]==1))
/* Bitmap end */
{
break;
}
if (((guchar) buffer[0]==0) && ((guchar) buffer[1]==2))
/* Deltarecord */
{
if (!ReadOK (fd, buffer, 2))
{
g_message (_("The bitmap ends unexpectedly."));
break;
}
xpos += (guchar) buffer[0];
ypos -= (guchar) buffer[1];
}
}
break;
}
}
break;
default:
g_assert_not_reached ();
break;
}
fclose (fd);
if (bpp <= 8)
for (i = 0, j = 0; i < ncols; i++)
{
gimp_cmap[j++] = cmap[i][0];
gimp_cmap[j++] = cmap[i][1];
gimp_cmap[j++] = cmap[i][2];
}
gimp_progress_update (1);
gimp_pixel_rgn_init (&pixel_rgn, drawable,
0, 0, drawable->width, drawable->height, TRUE, FALSE);
gimp_pixel_rgn_set_rect (&pixel_rgn, dest,
0, 0, drawable->width, drawable->height);
if ((!grey) && (bpp<= 8))
gimp_image_set_colormap (image, gimp_cmap, ncols);
gimp_drawable_flush (drawable);
gimp_drawable_detach (drawable);
g_free (dest);
return image;
}
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