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PIKApp/plug-ins/file-bmp/bmp-load.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* bmpread.c reads any bitmap I could get for testing */
/* Alexander.Schulz@stud.uni-karlsruhe.de */
/*
* PIKA - Photo and Image Kooker Application
* 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 <https://www.gnu.org/licenses/>.
* ----------------------------------------------------------------------------
*/
#include "config.h"
#include <errno.h>
#include <string.h>
#include <glib/gstdio.h>
#include <libpika/pika.h>
#include "bmp.h"
#include "bmp-load.h"
#include "libpika/stdplugins-intl.h"
#if !defined(WIN32) || defined(__MINGW32__)
#define BI_RGB 0
#define BI_RLE8 1
#define BI_RLE4 2
#define BI_BITFIELDS 3
#define BI_ALPHABITFIELDS 4
#endif
static PikaImage * ReadImage (FILE *fd,
GFile *file,
gint width,
gint height,
guchar cmap[256][3],
gint ncols,
gint bpp,
gint compression,
gint rowbytes,
gboolean gray,
const BitmapChannel *masks,
GError **error);
static void
setMasksDefault (gushort biBitCnt,
BitmapChannel *masks)
{
switch (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 = 0x00000000;
masks[3].shiftin = 0;
masks[3].max_value = (gfloat)0.0;
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;
}
}
static gint32
ToL (const guchar *buffer)
{
return (buffer[0] | buffer[1] << 8 | buffer[2] << 16 | buffer[3] << 24);
}
static gint16
ToS (const guchar *buffer)
{
return (buffer[0] | buffer[1] << 8);
}
static gboolean
ReadColorMap (FILE *fd,
guchar buffer[256][3],
gint number,
gint size,
gboolean *gray)
{
gint i;
*gray = (number > 2);
for (i = 0; i < number ; i++)
{
guchar rgb[4];
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];
*gray = ((*gray) && (rgb[0] == rgb[1]) && (rgb[1] == rgb[2]));
}
return TRUE;
}
static gboolean
ReadChannelMasks (guint32 *tmp,
BitmapChannel *masks,
guint channels)
{
gint i;
for (i = 0; i < channels; i++)
{
guint32 mask;
gint nbits, offset, bit;
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;
}
PikaImage *
load_image (GFile *file,
GError **error)
{
FILE *fd;
BitmapFileHead bitmap_file_head;
BitmapHead bitmap_head;
guchar buffer[124];
gint ColormapSize, rowbytes, Maps;
gboolean gray = FALSE;
guchar ColorMap[256][3];
PikaImage *image = NULL;
gchar magick[2];
BitmapChannel masks[4];
pika_progress_init_printf (_("Opening '%s'"),
pika_file_get_utf8_name (file));
fd = g_fopen (g_file_peek_path (file), "rb");
if (! fd)
{
g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
_("Could not open '%s' for reading: %s"),
pika_file_get_utf8_name (file), g_strerror (errno));
goto out;
}
/* 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, "PT", 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"),
pika_file_get_utf8_name (file));
goto out;
}
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"),
pika_file_get_utf8_name (file));
goto out;
}
if (! ReadOK (fd, magick, 2))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
pika_file_get_utf8_name (file));
goto out;
}
}
if (! ReadOK (fd, buffer, 12))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
pika_file_get_utf8_name (file));
goto out;
}
/* 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"),
pika_file_get_utf8_name (file));
goto out;
}
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'"),
pika_file_get_utf8_name (file));
goto out;
}
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'"),
pika_file_get_utf8_name (file));
goto out;
}
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)
{
#ifdef DEBUG
g_print ("Got BI_BITFIELDS compression\n");
#endif
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'"),
pika_file_get_utf8_name (file));
goto out;
}
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 if (bitmap_head.biCompr == BI_RGB)
{
#ifdef DEBUG
g_print ("Got BI_RGB compression\n");
#endif
setMasksDefault (bitmap_head.biBitCnt, masks);
}
else if ((bitmap_head.biCompr != BI_RLE4) &&
(bitmap_head.biCompr != BI_RLE8))
{
/* BI_ALPHABITFIELDS, etc. */
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Unsupported compression (%u) in BMP file from '%s'"),
bitmap_head.biCompr,
pika_file_get_utf8_name (file));
}
#ifdef DEBUG
g_print ("Got BI_RLE4 or BI_RLE8 compression\n");
#endif
}
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'"),
pika_file_get_utf8_name (file));
goto out;
}
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 if (bitmap_file_head.biSize == 108 ||
bitmap_file_head.biSize == 124)
{
/* BMP Version 4 or 5 */
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'"),
pika_file_get_utf8_name (file));
goto out;
}
bitmap_head.biWidth = ToL (&buffer[0x00]);
bitmap_head.biHeight = ToL (&buffer[0x04]);
bitmap_head.biPlanes = ToS (&buffer[0x08]);
bitmap_head.biBitCnt = ToS (&buffer[0x0A]);
bitmap_head.biCompr = ToL (&buffer[0x0C]);
bitmap_head.biSizeIm = ToL (&buffer[0x10]);
bitmap_head.biXPels = ToL (&buffer[0x14]);
bitmap_head.biYPels = ToL (&buffer[0x18]);
bitmap_head.biClrUsed = ToL (&buffer[0x1C]);
bitmap_head.biClrImp = ToL (&buffer[0x20]);
bitmap_head.masks[0] = ToL (&buffer[0x24]);
bitmap_head.masks[1] = ToL (&buffer[0x28]);
bitmap_head.masks[2] = ToL (&buffer[0x2C]);
bitmap_head.masks[3] = ToL (&buffer[0x30]);
Maps = 4;
if (bitmap_head.biCompr == BI_BITFIELDS)
{
#ifdef DEBUG
g_print ("Got BI_BITFIELDS compression\n");
#endif
ReadChannelMasks (&bitmap_head.masks[0], masks, 4);
}
else if (bitmap_head.biCompr == BI_RGB)
{
#ifdef DEBUG
g_print ("Got BI_RGB compression\n");
#endif
setMasksDefault (bitmap_head.biBitCnt, masks);
}
}
else
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("Error reading BMP file header from '%s'"),
pika_file_get_utf8_name (file));
goto out;
}
/* 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"),
pika_file_get_utf8_name (file));
goto out;
}
/* 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"),
pika_file_get_utf8_name (file));
goto out;
}
/* 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"),
pika_file_get_utf8_name (file));
goto out;
}
if (bitmap_head.biPlanes != 1)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
pika_file_get_utf8_name (file));
goto out;
}
if (bitmap_head.biClrUsed > 256 &&
bitmap_head.biBitCnt <= 8)
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
_("'%s' is not a valid BMP file"),
pika_file_get_utf8_name (file));
goto out;
}
/* 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"),
pika_file_get_utf8_name (file));
goto out;
}
/* 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: %lu, Colors: %lu, Bits: %hu, Width: %ld, Height: %ld, "
"Comp: %lu, Zeile: %d\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, &gray))
goto out;
}
fseek (fd, bitmap_file_head.bfOffs, SEEK_SET);
/* Get the Image and return the image or NULL on error*/
image = ReadImage (fd,
file,
bitmap_head.biWidth,
ABS (bitmap_head.biHeight),
ColorMap,
bitmap_head.biClrUsed,
bitmap_head.biBitCnt,
bitmap_head.biCompr,
rowbytes,
gray,
masks,
error);
if (! image)
goto out;
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 Pika should be trying
* to "fix" metric resolution translations, in the long term
* Pika 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;
pika_image_set_resolution (image, xresolution, yresolution);
}
if (bitmap_head.biHeight < 0)
pika_image_flip (image, PIKA_ORIENTATION_VERTICAL);
out:
if (fd)
fclose (fd);
return image;
}
static PikaImage *
ReadImage (FILE *fd,
GFile *file,
gint width,
gint height,
guchar cmap[256][3],
gint ncols,
gint bpp,
gint compression,
gint rowbytes,
gboolean gray,
const BitmapChannel *masks,
GError **error)
{
guchar v, n;
gint xpos = 0;
gint ypos = 0;
PikaImage *image;
PikaLayer *layer;
GeglBuffer *buffer;
guchar *dest, *temp, *row_buf;
guchar pika_cmap[768];
gushort rgb;
glong rowstride, channels;
gint i, i_max, j, cur_progress, max_progress;
gint total_bytes_read;
PikaImageBaseType base_type;
PikaImageType image_type;
guint32 px32;
if (! (compression == BI_RGB || compression == BI_BITFIELDS ||
(bpp == 8 && compression == BI_RLE8) ||
(bpp == 4 && compression == BI_RLE4)))
{
g_set_error (error, G_FILE_ERROR, G_FILE_ERROR_FAILED,
"%s",
_("Unrecognized or invalid BMP compression format."));
return NULL;
}
/* Make a new image in PIKA */
switch (bpp)
{
case 32:
case 24:
case 16:
base_type = PIKA_RGB;
if (masks[3].mask != 0)
{
image_type = PIKA_RGBA_IMAGE;
channels = 4;
}
else
{
image_type = PIKA_RGB_IMAGE;
channels = 3;
}
if (bpp == 24 && compression == BI_BITFIELDS)
g_printerr ("Loading BMP with invalid combination of 24 bpp and BI_BITFIELDS compression.\n");
break;
case 8:
case 4:
case 1:
if (gray)
{
base_type = PIKA_GRAY;
image_type = PIKA_GRAY_IMAGE;
}
else
{
base_type = PIKA_INDEXED;
image_type = PIKA_INDEXED_IMAGE;
}
if (compression == BI_BITFIELDS)
g_printerr ("Loading BMP with invalid combination of %d bpp and BI_BITFIELDS compression.\n",
bpp);
channels = 1;
break;
default:
g_message (_("Unsupported or invalid bitdepth."));
return NULL;
}
if ((width < 0) || (width > PIKA_MAX_IMAGE_SIZE))
{
g_message (_("Unsupported or invalid image width: %d"), width);
return NULL;
}
if ((height < 0) || (height > PIKA_MAX_IMAGE_SIZE))
{
g_message (_("Unsupported or invalid image height: %d"), height);
return NULL;
}
image = pika_image_new (width, height, base_type);
layer = pika_layer_new (image, _("Background"),
width, height,
image_type, 100,
pika_image_get_default_new_layer_mode (image));
pika_image_insert_layer (image, layer, NULL, 0);
/* 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 (width * height * channels);
row_buf = g_malloc (rowbytes);
rowstride = 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, row_buf, rowbytes))
{
temp = dest + (ypos * rowstride);
for (xpos= 0; xpos < width; ++xpos)
{
px32 = ToL(&row_buf[xpos*4]);
*(temp++) = ((px32 & masks[0].mask) >> masks[0].shiftin) * 255.0 / masks[0].max_value + 0.5;
*(temp++) = ((px32 & masks[1].mask) >> masks[1].shiftin) * 255.0 / masks[1].max_value + 0.5;
*(temp++) = ((px32 & masks[2].mask) >> masks[2].shiftin) * 255.0 / masks[2].max_value + 0.5;
if (channels > 3)
*(temp++) = ((px32 & 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)
pika_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
}
break;
case 24:
{
while (ReadOK (fd, row_buf, rowbytes))
{
temp = dest + (ypos * rowstride);
for (xpos= 0; xpos < width; ++xpos)
{
*(temp++) = row_buf[xpos * 3 + 2];
*(temp++) = row_buf[xpos * 3 + 1];
*(temp++) = row_buf[xpos * 3];
}
if (ypos == 0)
break;
--ypos; /* next line */
cur_progress++;
if ((cur_progress % 5) == 0)
pika_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
}
break;
case 16:
{
while (ReadOK (fd, row_buf, rowbytes))
{
temp = dest + (ypos * rowstride);
for (xpos= 0; xpos < width; ++xpos)
{
rgb= ToS(&row_buf[xpos * 2]);
*(temp++) = ((rgb & masks[0].mask) >> masks[0].shiftin) * 255.0 / masks[0].max_value + 0.5;
*(temp++) = ((rgb & masks[1].mask) >> masks[1].shiftin) * 255.0 / masks[1].max_value + 0.5;
*(temp++) = ((rgb & masks[2].mask) >> masks[2].shiftin) * 255.0 / masks[2].max_value + 0.5;
if (channels > 3)
*(temp++) = ((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)
pika_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
}
break;
case 8:
case 4:
case 1:
{
if (compression == BI_RGB || compression == BI_BITFIELDS)
/* 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 (gray)
*temp = cmap[*temp][0];
}
if (xpos == width)
{
fread (row_buf, rowbytes - 1 - (width * bpp - 1) / 8, 1, fd);
if (ypos == 0)
break;
ypos--;
xpos = 0;
cur_progress++;
if ((cur_progress % 5) == 0)
pika_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, row_buf, 2))
{
g_message (_("The bitmap ends unexpectedly."));
break;
}
if (row_buf[0] != 0)
/* Count + Color - record */
{
/* encoded mode run -
* row_buf[0] == run_length
* row_buf[1] == pixel data
*/
for (j = 0;
((guchar) j < row_buf[0]) && (xpos < width);)
{
#ifdef DEBUG2
printf("%u %u | ",xpos,width);
#endif
for (i = 1;
((i <= (8 / bpp)) &&
(xpos < width) &&
((guchar) j < row_buf[0]));
i++, xpos++, j++)
{
temp = dest + (ypos * rowstride) + (xpos * channels);
*temp = (row_buf[1] &
(((1<<bpp)-1) << (8 - (i * bpp)))) >> (8 - (i * bpp));
if (gray)
*temp = cmap[*temp][0];
}
}
}
if ((row_buf[0] == 0) && (row_buf[1] > 2))
/* uncompressed record */
{
n = row_buf[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 (gray)
*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 ((row_buf[0] == 0) && (row_buf[1] == 0))
/* Line end */
{
ypos--;
xpos = 0;
cur_progress++;
if ((cur_progress % 5) == 0)
pika_progress_update ((gdouble) cur_progress /
(gdouble) max_progress);
}
if ((row_buf[0] == 0) && (row_buf[1] == 1))
/* Bitmap end */
{
break;
}
if ((row_buf[0] == 0) && (row_buf[1] == 2))
/* Deltarecord */
{
if (! ReadOK (fd, row_buf, 2))
{
g_message (_("The bitmap ends unexpectedly."));
break;
}
xpos += row_buf[0];
ypos -= row_buf[1];
}
}
break;
}
}
break;
default:
g_assert_not_reached ();
break;
}
if (bpp <= 8)
for (i = 0, j = 0; i < ncols; i++)
{
pika_cmap[j++] = cmap[i][0];
pika_cmap[j++] = cmap[i][1];
pika_cmap[j++] = cmap[i][2];
}
buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (layer));
gegl_buffer_set (buffer, GEGL_RECTANGLE (0, 0, width, height), 0,
NULL, dest, GEGL_AUTO_ROWSTRIDE);
g_object_unref (buffer);
g_free (dest);
if ((! gray) && (bpp <= 8))
pika_image_set_colormap (image, pika_cmap, ncols);
pika_progress_update (1.0);
return image;
}