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/* $Id$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 Markus Dahms <mad@automagically.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <g3d/types.h>
#include <g3d/stream.h>
#define SGI_STORAGE_VERBATIM 0
#define SGI_STORAGE_RLE 1
EAPI
gboolean plugin_load_image_from_stream(G3DContext *context, G3DStream *stream,
G3DImage *image, gpointer user_data)
{
guint32 cmap, planes, x, y, p;
guint16 dims;
guint8 storage, bpc;
gchar name[80];
if(g3d_stream_read_int16_be(stream) != 474) {
g_warning("file '%s' is not a SGI RGB file", stream->uri);
return FALSE;
}
storage = g3d_stream_read_int8(stream);
bpc = g3d_stream_read_int8(stream);
dims = g3d_stream_read_int16_be(stream);
if(bpc != 1) {
g_warning("SGI: %s: bpc != 1 -- unsupported", stream->uri);
return FALSE;
}
image->width = g3d_stream_read_int16_be(stream);
image->height = g3d_stream_read_int16_be(stream);
planes = g3d_stream_read_int16_be(stream); /* ZSIZE */
image->depth = 32;
g3d_stream_read_int32_be(stream); /* PIXMIN */
g3d_stream_read_int32_be(stream); /* PIXMAX */
g3d_stream_read_int32_be(stream); /* DUMMY */
g3d_stream_read(stream, name, 80);
if(strlen(name) > 0) {
#if DEBUG > 0
g_debug("SGI: image name: %s", name);
#endif
image->name = g_strdup(name);
} else {
image->name = g_strdup(stream->uri);
}
cmap = g3d_stream_read_int32_be(stream); /* COLORMAP */
g3d_stream_skip(stream, 404);
#if DEBUG > 0
g_debug("SGI: %dx%dx%d, %d bpc, colormap: 0x%02x",
image->width, image->height, planes, bpc, cmap);
#endif
/* end of header */
image->pixeldata = g_new0(guint8, image->width * image->height * 4);
if(storage == SGI_STORAGE_VERBATIM) {
for(p = 0; p < planes; p ++) {
for(y = 0; y < image->height; y ++) {
for(x = 0; x < image->width; x ++) {
image->pixeldata[(y * image->width + x) * 4 + p] =
g3d_stream_read_int8(stream);
if(planes == 1) {
/* greyscale: g = r; b = r; */
image->pixeldata[(y * image->width + x) * 4 + 1] =
image->pixeldata[(y * image->width + x) * 4];
image->pixeldata[(y * image->width + x) * 4 + 2] =
image->pixeldata[(y * image->width + x) * 4];
}
} /* x */
} /* y */
} /* p */
} /* verbatim */
else /* RLE */ {
guint32 *starttab, *lengthtab, rleoff, rlelen;
guint8 cnt, pixel;
starttab = g_new0(guint32, image->height * planes);
lengthtab = g_new0(guint32, image->height * planes);
/* read starttab */
for(p = 0; p < planes; p ++)
for(y = 0; y < image->height; y ++)
starttab[y * planes + p] = g3d_stream_read_int32_be(stream);
/* read lengthtab */
for(p = 0; p < planes; p ++)
for(y = 0; y < image->height; y ++)
lengthtab[y * planes + p] = g3d_stream_read_int32_be(stream);
/* read image data */
for(p = 0; p < planes; p ++)
for(y = 0; y < image->height; y ++)
{
rleoff = starttab[y * planes + p];
rlelen = lengthtab[y * planes + p];
g3d_stream_seek(stream, rleoff, G_SEEK_SET);
x = 0;
while(1) {
pixel = g3d_stream_read_int8(stream);
cnt = pixel & 0x7F;
if(cnt == 0)
break;
if(pixel & 0x80) {
/* copy n bytes */
while(cnt --) {
image->pixeldata[(y * image->width + x) * 4 + p] =
g3d_stream_read_int8(stream);
x ++;
}
} else {
/* repeat next byte n times */
pixel = g3d_stream_read_int8(stream);
while(cnt --) {
image->pixeldata[(y * image->width + x) * 4 + p] =
pixel;
x ++;
}
}
}
}
g_free(starttab);
g_free(lengthtab);
}
/* set alpha to 1.0 */
if(planes < 4)
for(y = 0; y < image->height; y ++)
for(x = 0; x < image->width; x ++)
image->pixeldata[(y * image->width + x) * 4 + 3] = 0xFF;
return TRUE;
}
EAPI
gchar *plugin_description(G3DContext *context)
{
return g_strdup("SGI RGB images.");
}
EAPI
gchar **plugin_extensions(G3DContext *context)
{
return g_strsplit("rgb:rgba:sgi", ":", 0);
}
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