b71e53b222
1999-11-05 Jonathan Blandford <jrb@redhat.com> * src/io-ras.c (image_load): new file from Arjan van de Ven <arjan@fenrus.demon.nl> to begin the ras loader.
166 lines
3.6 KiB
C
166 lines
3.6 KiB
C
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/* GdkPixbuf library - JPEG image loader
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*
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Authors: Arjan van de Ven <arjan@fenrus.demon.nl>
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* Federico Mena-Quintero <federico@gimp.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <glib.h>
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#include "gdk-pixbuf.h"
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#include "gdk-pixbuf-io.h"
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/* Header structure for sunras files.
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All values are in big-endian order on disk
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*/
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struct rasterfile
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{
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guint magic;
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guint width;
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guint height;
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guint depth;
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guint length;
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guint type;
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guint maptype;
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guint maplength;
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};
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/*
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This does a byte-order swap. Does glib have something like
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be32_to_cpu() ??
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*/
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unsigned int ByteOrder(unsigned int i)
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{
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unsigned int i2;
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i2 = ((i&255)<<24) | (((i>>8)&255)<<16) | (((i>>16)&255)<<8)|((i>>24)&255);
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return i2;
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}
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/* Destroy notification function for the libart pixbuf */
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static void
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free_buffer (gpointer user_data, gpointer data)
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{
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free (data);
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}
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/* Shared library entry point */
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GdkPixbuf *
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image_load (FILE *f)
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{
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gboolean failed = FALSE;
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gint i, ctype, bpp;
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guchar *pixels;
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struct rasterfile Header;
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i=fread(&Header,1,sizeof(Header),f);
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g_assert(i==32);
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Header.width = ByteOrder(Header.width);
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Header.height = ByteOrder(Header.height);
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Header.depth = ByteOrder(Header.depth);
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if (Header.depth == 32)
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bpp = 4;
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else
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bpp = 3;
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pixels = (guchar*)malloc (Header.width * Header.height * bpp);
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if (!pixels) {
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return NULL;
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}
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fread(pixels,Header.width*bpp,Header.height,f);
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if (bpp==4)
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return gdk_pixbuf_new_from_data (pixels, ART_PIX_RGB, TRUE,
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Header.width, Header.height,
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Header.width * bpp,
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free_buffer, NULL);
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else
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return gdk_pixbuf_new_from_data (pixels, ART_PIX_RGB, FALSE,
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Header.width, Header.height, Header.width * bpp,
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free_buffer, NULL);
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}
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/* These avoid the setjmp()/longjmp() crap in libpng */
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typedef struct _LoadContext LoadContext;
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struct _LoadContext {
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ModulePreparedNotifyFunc notify_func;
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gpointer notify_user_data;
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GdkPixbuf* pixbuf;
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guint fatal_error_occurred : 1;
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};
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gpointer
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image_begin_load (ModulePreparedNotifyFunc prepare_func,
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ModuleUpdatedNotifyFunc update_func,
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gpointer user_data)
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{
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LoadContext* lc;
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lc = g_new0(LoadContext, 1);
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lc->fatal_error_occurred = FALSE;
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lc->notify_func = prepare_func;
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lc->notify_user_data = user_data;
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return lc;
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}
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void
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image_stop_load (gpointer context)
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{
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LoadContext* lc = context;
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g_return_if_fail(lc != NULL);
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gdk_pixbuf_unref(lc->pixbuf);
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g_free(lc);
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}
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gboolean
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image_load_increment(gpointer context, guchar *buf, guint size)
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{
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LoadContext* lc = context;
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g_return_val_if_fail(lc != NULL, FALSE);
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if (lc->fatal_error_occurred)
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return FALSE;
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else
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return TRUE;
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}
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