1999-10-20 21:20:49 +00:00
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/* GdkPixbuf library - JPEG image loader
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*
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* Copyright (C) 1999 Michael Zucchi
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* Copyright (C) 1999 The Free Software Foundation
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1999-10-29 22:37:27 +00:00
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*
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* Progressive loading code Copyright (C) 1999 Red Hat, Inc.
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1999-10-20 21:20:49 +00:00
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*
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* Authors: Michael Zucchi <zucchi@zedzone.mmc.com.au>
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* Federico Mena-Quintero <federico@gimp.org>
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1999-10-29 22:37:27 +00:00
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* Michael Fulbright <drmike@redhat.com>
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1999-10-20 21:20:49 +00:00
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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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1999-06-29 11:13:31 +00:00
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1999-10-29 22:37:27 +00:00
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/*
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1999-11-03 22:00:27 +00:00
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Progressive file loading notes (11/03/1999) <drmike@redhat.com>...
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1999-10-29 22:37:27 +00:00
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These are issues I know of and will be dealing with shortly:
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- Currently does not handle progressive jpegs - this
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requires a change in the way image_load_increment () calls
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libjpeg. Progressive jpegs are rarer but I will add this
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support asap.
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- error handling is not as good as it should be
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*/
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1999-06-29 11:13:31 +00:00
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#include <config.h>
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#include <stdio.h>
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1999-11-03 17:17:32 +00:00
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#include <stdlib.h>
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#include <string.h>
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1999-06-29 11:13:31 +00:00
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#include <setjmp.h>
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#include <jpeglib.h>
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1999-10-20 21:20:49 +00:00
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#include "gdk-pixbuf.h"
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1999-10-29 22:37:27 +00:00
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#include "gdk-pixbuf-io.h"
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1999-10-20 21:20:49 +00:00
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1999-06-29 11:13:31 +00:00
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1999-10-29 22:37:27 +00:00
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/* we are a "source manager" as far as libjpeg is concerned */
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1999-11-03 17:17:32 +00:00
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#define JPEG_PROG_BUF_SIZE 4096
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1999-10-29 22:37:27 +00:00
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typedef struct {
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struct jpeg_source_mgr pub; /* public fields */
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1999-11-03 17:17:32 +00:00
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JOCTET buffer[JPEG_PROG_BUF_SIZE]; /* start of buffer */
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1999-10-29 22:37:27 +00:00
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long skip_next; /* number of bytes to skip next read */
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1999-11-02 16:10:25 +00:00
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1999-10-29 22:37:27 +00:00
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} my_source_mgr;
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typedef my_source_mgr * my_src_ptr;
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1999-06-29 11:13:31 +00:00
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/* error handler data */
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1999-10-20 21:20:49 +00:00
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struct error_handler_data {
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1999-06-29 11:13:31 +00:00
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struct jpeg_error_mgr pub;
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1999-10-18 19:29:45 +00:00
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sigjmp_buf setjmp_buffer;
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1999-06-29 11:13:31 +00:00
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};
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1999-10-29 22:37:27 +00:00
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/* progressive loader context */
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typedef struct {
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1999-11-04 20:02:37 +00:00
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ModuleUpdatedNotifyFunc updated_func;
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ModulePreparedNotifyFunc prepared_func;
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gpointer user_data;
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1999-10-29 22:37:27 +00:00
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GdkPixbuf *pixbuf;
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guchar *dptr; /* current position in pixbuf */
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gboolean did_prescan; /* are we in image data yet? */
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gboolean got_header; /* have we loaded jpeg header? */
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gboolean src_initialized;/* TRUE when jpeg lib initialized */
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struct jpeg_decompress_struct cinfo;
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struct error_handler_data jerr;
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} JpegProgContext;
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GdkPixbuf *image_load (FILE *f);
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1999-11-04 20:02:37 +00:00
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gpointer image_begin_load (ModulePreparedNotifyFunc func,
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ModuleUpdatedNotifyFunc func2, gpointer user_data);
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1999-10-29 22:37:27 +00:00
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void image_stop_load (gpointer context);
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gboolean image_load_increment(gpointer context, guchar *buf, guint size);
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1999-06-29 11:13:31 +00:00
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static void
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1999-10-20 21:20:49 +00:00
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fatal_error_handler (j_common_ptr cinfo)
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1999-06-29 11:13:31 +00:00
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{
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/* FIXME:
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* We should somehow signal what error occurred to the caller so the
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* caller can handle the error message */
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1999-10-20 21:20:49 +00:00
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struct error_handler_data *errmgr;
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1999-06-29 11:13:31 +00:00
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1999-10-20 21:20:49 +00:00
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errmgr = (struct error_handler_data *) cinfo->err;
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cinfo->err->output_message (cinfo);
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siglongjmp (errmgr->setjmp_buffer, 1);
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1999-06-29 11:13:31 +00:00
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return;
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}
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1999-10-20 21:20:49 +00:00
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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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1999-10-29 22:37:27 +00:00
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/* explode gray image data from jpeg library into rgb components in pixbuf */
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static void
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explode_gray_into_buf (struct jpeg_decompress_struct *cinfo,
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guchar **lines)
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{
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gint i, j;
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guint w;
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g_return_if_fail (cinfo != NULL);
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g_return_if_fail (cinfo->output_components == 1);
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/* Expand grey->colour. Expand from the end of the
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* memory down, so we can use the same buffer.
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*/
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w = cinfo->image_width;
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for (i = cinfo->rec_outbuf_height - 1; i >= 0; i--) {
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guchar *from, *to;
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from = lines[i] + w - 1;
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to = lines[i] + (w - 1) * 3;
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for (j = w - 1; j >= 0; j--) {
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to[0] = from[0];
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1999-10-29 23:07:23 +00:00
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to[1] = from[0];
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to[2] = from[0];
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1999-10-29 22:37:27 +00:00
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to -= 3;
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from--;
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}
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}
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}
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1999-10-20 21:20:49 +00:00
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/* Shared library entry point */
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1999-10-18 19:29:45 +00:00
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GdkPixbuf *
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1999-10-20 21:20:49 +00:00
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image_load (FILE *f)
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1999-06-29 11:13:31 +00:00
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{
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1999-11-05 00:16:10 +00:00
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gint w, h, i;
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1999-10-26 20:43:39 +00:00
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guchar *pixels = NULL;
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guchar *dptr;
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1999-11-04 20:02:37 +00:00
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guchar *lines[4]; /* Used to expand rows, via rec_outbuf_height,
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* from the header file:
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* " Usually rec_outbuf_height will be 1 or 2,
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* at most 4."
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1999-10-20 21:20:49 +00:00
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*/
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guchar **lptr;
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1999-06-29 11:13:31 +00:00
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struct jpeg_decompress_struct cinfo;
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1999-10-20 21:20:49 +00:00
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struct error_handler_data jerr;
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1999-06-29 11:13:31 +00:00
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/* setup error handler */
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1999-10-20 21:20:49 +00:00
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cinfo.err = jpeg_std_error (&jerr.pub);
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jerr.pub.error_exit = fatal_error_handler;
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1999-06-29 11:13:31 +00:00
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1999-10-20 21:20:49 +00:00
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if (sigsetjmp (jerr.setjmp_buffer, 1)) {
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1999-06-29 11:13:31 +00:00
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/* Whoops there was a jpeg error */
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1999-10-20 21:20:49 +00:00
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if (pixels)
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free (pixels);
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jpeg_destroy_decompress (&cinfo);
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1999-06-29 11:13:31 +00:00
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return NULL;
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}
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/* load header, setup */
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1999-10-20 21:20:49 +00:00
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jpeg_create_decompress (&cinfo);
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jpeg_stdio_src (&cinfo, f);
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jpeg_read_header (&cinfo, TRUE);
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jpeg_start_decompress (&cinfo);
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1999-06-29 11:13:31 +00:00
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cinfo.do_fancy_upsampling = FALSE;
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cinfo.do_block_smoothing = FALSE;
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1999-07-12 04:55:16 +00:00
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1999-06-29 11:13:31 +00:00
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w = cinfo.output_width;
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h = cinfo.output_height;
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1999-11-05 00:16:10 +00:00
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pixels = g_malloc (h * w * 3);
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1999-10-20 21:20:49 +00:00
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if (!pixels) {
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jpeg_destroy_decompress (&cinfo);
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1999-06-29 11:13:31 +00:00
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return NULL;
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}
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1999-10-20 21:20:49 +00:00
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1999-06-29 11:13:31 +00:00
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dptr = pixels;
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/* decompress all the lines, a few at a time */
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while (cinfo.output_scanline < cinfo.output_height) {
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lptr = lines;
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1999-10-20 21:20:49 +00:00
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for (i = 0; i < cinfo.rec_outbuf_height; i++) {
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*lptr++ = dptr;
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dptr += w * 3;
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1999-06-29 11:13:31 +00:00
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}
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1999-10-20 21:20:49 +00:00
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jpeg_read_scanlines (&cinfo, lines, cinfo.rec_outbuf_height);
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1999-10-29 22:37:27 +00:00
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if (cinfo.output_components == 1)
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explode_gray_into_buf (&cinfo, lines);
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1999-06-29 11:13:31 +00:00
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}
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1999-10-20 21:20:49 +00:00
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jpeg_finish_decompress (&cinfo);
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jpeg_destroy_decompress (&cinfo);
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return gdk_pixbuf_new_from_data (pixels, ART_PIX_RGB, FALSE,
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w, h, w * 3,
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free_buffer, NULL);
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1999-06-29 11:13:31 +00:00
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}
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1999-10-29 22:37:27 +00:00
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/**** Progressive image loading handling *****/
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/* these routines required because we are acting as a source manager for */
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/* libjpeg. */
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static void
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init_source (j_decompress_ptr cinfo)
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{
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my_src_ptr src = (my_src_ptr) cinfo->src;
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src->skip_next = 0;
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}
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static void
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term_source (j_decompress_ptr cinfo)
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{
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/* XXXX - probably should scream something has happened */
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}
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/* for progressive loading (called "I/O Suspension" by libjpeg docs) */
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/* we do nothing except return "FALSE" */
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static boolean
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fill_input_buffer (j_decompress_ptr cinfo)
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{
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return FALSE;
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}
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static void
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skip_input_data (j_decompress_ptr cinfo, long num_bytes)
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{
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my_src_ptr src = (my_src_ptr) cinfo->src;
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long num_can_do;
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/* move as far as we can into current buffer */
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/* then set skip_next to catch the rest */
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if (num_bytes > 0) {
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num_can_do = MIN (src->pub.bytes_in_buffer, num_bytes);
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src->pub.next_input_byte += (size_t) num_can_do;
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src->pub.bytes_in_buffer -= (size_t) num_can_do;
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src->skip_next = num_bytes - num_can_do;
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}
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}
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/*
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* func - called when we have pixmap created (but no image data)
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* user_data - passed as arg 1 to func
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* return context (opaque to user)
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*/
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gpointer
|
1999-11-04 20:02:37 +00:00
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image_begin_load (ModulePreparedNotifyFunc prepared_func,
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ModuleUpdatedNotifyFunc updated_func,
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gpointer user_data)
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1999-10-29 22:37:27 +00:00
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{
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JpegProgContext *context;
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my_source_mgr *src;
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1999-11-03 17:17:32 +00:00
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context = g_new0 (JpegProgContext, 1);
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1999-11-04 20:02:37 +00:00
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context->prepared_func = prepared_func;
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context->updated_func = updated_func;
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context->user_data = user_data;
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1999-10-29 22:37:27 +00:00
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context->pixbuf = NULL;
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context->got_header = FALSE;
|
|
|
|
|
context->did_prescan = FALSE;
|
|
|
|
|
context->src_initialized = FALSE;
|
|
|
|
|
|
|
|
|
|
/* create libjpeg structures */
|
|
|
|
|
jpeg_create_decompress (&context->cinfo);
|
|
|
|
|
|
1999-11-03 17:17:32 +00:00
|
|
|
|
context->cinfo.src = (struct jpeg_source_mgr *) g_new0 (my_source_mgr, 1);
|
1999-10-29 22:37:27 +00:00
|
|
|
|
src = (my_src_ptr) context->cinfo.src;
|
|
|
|
|
|
|
|
|
|
context->cinfo.err = jpeg_std_error (&context->jerr.pub);
|
|
|
|
|
|
|
|
|
|
src = (my_src_ptr) context->cinfo.src;
|
|
|
|
|
src->pub.init_source = init_source;
|
|
|
|
|
src->pub.fill_input_buffer = fill_input_buffer;
|
|
|
|
|
src->pub.skip_input_data = skip_input_data;
|
|
|
|
|
src->pub.resync_to_restart = jpeg_resync_to_restart;
|
|
|
|
|
src->pub.term_source = term_source;
|
|
|
|
|
src->pub.bytes_in_buffer = 0;
|
|
|
|
|
src->pub.next_input_byte = NULL;
|
|
|
|
|
|
|
|
|
|
return (gpointer) context;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* context - returned from image_begin_load
|
|
|
|
|
*
|
|
|
|
|
* free context, unref gdk_pixbuf
|
|
|
|
|
*/
|
|
|
|
|
void
|
|
|
|
|
image_stop_load (gpointer data)
|
|
|
|
|
{
|
|
|
|
|
JpegProgContext *context = (JpegProgContext *) data;
|
1999-11-03 17:17:32 +00:00
|
|
|
|
|
1999-10-29 22:37:27 +00:00
|
|
|
|
g_return_if_fail (context != NULL);
|
|
|
|
|
|
|
|
|
|
if (context->pixbuf)
|
|
|
|
|
gdk_pixbuf_unref (context->pixbuf);
|
|
|
|
|
|
1999-11-03 22:00:27 +00:00
|
|
|
|
jpeg_finish_decompress(&context->cinfo);
|
|
|
|
|
jpeg_destroy_decompress(&context->cinfo);
|
|
|
|
|
|
1999-10-29 22:37:27 +00:00
|
|
|
|
if (context->cinfo.src) {
|
|
|
|
|
my_src_ptr src = (my_src_ptr) context->cinfo.src;
|
|
|
|
|
|
|
|
|
|
g_free (src);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
g_free (context);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* context - from image_begin_load
|
|
|
|
|
* buf - new image data
|
|
|
|
|
* size - length of new image data
|
|
|
|
|
*
|
|
|
|
|
* append image data onto inrecrementally built output image
|
|
|
|
|
*/
|
|
|
|
|
gboolean
|
|
|
|
|
image_load_increment (gpointer data, guchar *buf, guint size)
|
|
|
|
|
{
|
|
|
|
|
JpegProgContext *context = (JpegProgContext *)data;
|
|
|
|
|
struct jpeg_decompress_struct *cinfo;
|
|
|
|
|
my_src_ptr src;
|
|
|
|
|
guint num_left, num_copy;
|
1999-11-03 22:00:27 +00:00
|
|
|
|
guint last_bytes_left;
|
|
|
|
|
guint spinguard;
|
1999-11-09 17:24:15 +00:00
|
|
|
|
gboolean first;
|
1999-11-03 22:00:27 +00:00
|
|
|
|
guchar *bufhd;
|
1999-10-29 22:37:27 +00:00
|
|
|
|
|
|
|
|
|
g_return_val_if_fail (context != NULL, FALSE);
|
|
|
|
|
g_return_val_if_fail (buf != NULL, FALSE);
|
|
|
|
|
|
|
|
|
|
src = (my_src_ptr) context->cinfo.src;
|
1999-11-03 17:17:32 +00:00
|
|
|
|
|
1999-10-29 22:37:27 +00:00
|
|
|
|
cinfo = &context->cinfo;
|
|
|
|
|
|
1999-11-03 22:00:27 +00:00
|
|
|
|
/* XXXXXXX (drmike) - loop(s) below need to be recoded now I
|
|
|
|
|
* have a grasp of what the flow needs to be!
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
1999-10-29 22:37:27 +00:00
|
|
|
|
/* skip over data if requested, handle unsigned int sizes cleanly */
|
|
|
|
|
/* only can happen if we've already called jpeg_get_header once */
|
|
|
|
|
if (context->src_initialized && src->skip_next) {
|
|
|
|
|
if (src->skip_next > size) {
|
|
|
|
|
src->skip_next -= size;
|
|
|
|
|
return TRUE;
|
|
|
|
|
} else {
|
|
|
|
|
num_left = size - src->skip_next;
|
1999-11-03 22:00:27 +00:00
|
|
|
|
bufhd = buf + src->skip_next;
|
1999-10-29 22:37:27 +00:00
|
|
|
|
src->skip_next = 0;
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
num_left = size;
|
1999-11-03 22:00:27 +00:00
|
|
|
|
bufhd = buf;
|
1999-10-29 22:37:27 +00:00
|
|
|
|
}
|
|
|
|
|
|
1999-11-09 17:24:15 +00:00
|
|
|
|
if (num_left == 0)
|
|
|
|
|
return TRUE;
|
1999-11-03 17:17:32 +00:00
|
|
|
|
|
1999-11-03 22:00:27 +00:00
|
|
|
|
last_bytes_left = 0;
|
|
|
|
|
spinguard = 0;
|
1999-11-09 17:24:15 +00:00
|
|
|
|
first = TRUE;
|
|
|
|
|
while (TRUE) {
|
1999-11-03 22:00:27 +00:00
|
|
|
|
|
|
|
|
|
/* handle any data from caller we haven't processed yet */
|
|
|
|
|
if (num_left > 0) {
|
|
|
|
|
if(src->pub.bytes_in_buffer &&
|
|
|
|
|
src->pub.next_input_byte != src->buffer)
|
|
|
|
|
memmove(src->buffer, src->pub.next_input_byte,
|
|
|
|
|
src->pub.bytes_in_buffer);
|
1999-11-03 17:17:32 +00:00
|
|
|
|
|
|
|
|
|
|
1999-11-03 22:00:27 +00:00
|
|
|
|
num_copy = MIN (JPEG_PROG_BUF_SIZE - src->pub.bytes_in_buffer,
|
|
|
|
|
num_left);
|
1999-11-02 17:17:00 +00:00
|
|
|
|
|
1999-11-03 22:00:27 +00:00
|
|
|
|
/* if (num_copy == 0)
|
|
|
|
|
g_error ("Buffer overflow!");
|
|
|
|
|
*/
|
|
|
|
|
memcpy(src->buffer + src->pub.bytes_in_buffer, bufhd,num_copy);
|
|
|
|
|
src->pub.next_input_byte = src->buffer;
|
|
|
|
|
src->pub.bytes_in_buffer += num_copy;
|
|
|
|
|
bufhd += num_copy;
|
|
|
|
|
num_left -= num_copy;
|
|
|
|
|
} else {
|
|
|
|
|
/* did anything change from last pass, if not return */
|
1999-11-09 17:24:15 +00:00
|
|
|
|
if (first) {
|
1999-11-03 22:00:27 +00:00
|
|
|
|
last_bytes_left = src->pub.bytes_in_buffer;
|
1999-11-09 17:24:15 +00:00
|
|
|
|
first = FALSE;
|
|
|
|
|
} else if (src->pub.bytes_in_buffer == last_bytes_left)
|
1999-11-03 22:00:27 +00:00
|
|
|
|
spinguard++;
|
|
|
|
|
else
|
|
|
|
|
last_bytes_left = src->pub.bytes_in_buffer;
|
|
|
|
|
}
|
1999-11-02 17:17:00 +00:00
|
|
|
|
|
1999-11-03 22:00:27 +00:00
|
|
|
|
/* should not go through twice and not pull bytes out of buf */
|
|
|
|
|
if (spinguard > 2)
|
|
|
|
|
return TRUE;
|
1999-10-29 22:37:27 +00:00
|
|
|
|
|
|
|
|
|
/* try to load jpeg header */
|
|
|
|
|
if (!context->got_header) {
|
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
|
|
rc = jpeg_read_header (cinfo, TRUE);
|
|
|
|
|
context->src_initialized = TRUE;
|
1999-11-03 17:17:32 +00:00
|
|
|
|
|
1999-10-29 22:37:27 +00:00
|
|
|
|
if (rc == JPEG_SUSPENDED)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
context->got_header = TRUE;
|
|
|
|
|
|
1999-11-09 17:24:15 +00:00
|
|
|
|
#if 0
|
1999-10-29 22:37:27 +00:00
|
|
|
|
if (jpeg_has_multiple_scans (cinfo)) {
|
|
|
|
|
g_print ("io-jpeg.c: Does not currently "
|
|
|
|
|
"support progressive jpeg files.\n");
|
|
|
|
|
return FALSE;
|
|
|
|
|
}
|
1999-11-09 17:24:15 +00:00
|
|
|
|
#endif
|
1999-10-29 22:37:27 +00:00
|
|
|
|
context->pixbuf = gdk_pixbuf_new(ART_PIX_RGB,
|
|
|
|
|
/*have_alpha*/ FALSE,
|
|
|
|
|
8,
|
|
|
|
|
cinfo->image_width,
|
|
|
|
|
cinfo->image_height);
|
|
|
|
|
|
|
|
|
|
if (context->pixbuf == NULL) {
|
|
|
|
|
/* Failed to allocate memory */
|
1999-11-03 17:17:32 +00:00
|
|
|
|
g_error ("Couldn't allocate gdkpixbuf");
|
1999-10-29 22:37:27 +00:00
|
|
|
|
}
|
|
|
|
|
|
1999-10-29 22:54:02 +00:00
|
|
|
|
/* Use pixbuf buffer to store decompressed data */
|
1999-10-29 22:37:27 +00:00
|
|
|
|
context->dptr = context->pixbuf->art_pixbuf->pixels;
|
|
|
|
|
|
|
|
|
|
/* Notify the client that we are ready to go */
|
1999-11-04 20:02:37 +00:00
|
|
|
|
(* context->prepared_func) (context->pixbuf,
|
|
|
|
|
context->user_data);
|
1999-10-29 22:37:27 +00:00
|
|
|
|
|
|
|
|
|
} else if (!context->did_prescan) {
|
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
|
|
/* start decompression */
|
|
|
|
|
rc = jpeg_start_decompress (cinfo);
|
|
|
|
|
cinfo->do_fancy_upsampling = FALSE;
|
|
|
|
|
cinfo->do_block_smoothing = FALSE;
|
|
|
|
|
|
|
|
|
|
if (rc == JPEG_SUSPENDED)
|
|
|
|
|
continue;
|
|
|
|
|
|
|
|
|
|
context->did_prescan = TRUE;
|
|
|
|
|
} else {
|
1999-11-09 17:24:15 +00:00
|
|
|
|
|
1999-10-29 22:37:27 +00:00
|
|
|
|
/* we're decompressing so feed jpeg lib scanlines */
|
|
|
|
|
guchar *lines[4];
|
|
|
|
|
guchar **lptr;
|
1999-11-10 15:45:24 +00:00
|
|
|
|
guchar *rowptr;
|
1999-10-29 22:37:27 +00:00
|
|
|
|
gint nlines, i;
|
|
|
|
|
gint start_scanline;
|
|
|
|
|
|
1999-10-29 22:54:02 +00:00
|
|
|
|
/* keep going until we've done all scanlines */
|
1999-10-29 22:37:27 +00:00
|
|
|
|
while (cinfo->output_scanline < cinfo->output_height) {
|
|
|
|
|
start_scanline = cinfo->output_scanline;
|
|
|
|
|
lptr = lines;
|
|
|
|
|
rowptr = context->dptr;
|
|
|
|
|
for (i=0; i < cinfo->rec_outbuf_height; i++) {
|
|
|
|
|
*lptr++ = rowptr;
|
1999-11-09 23:21:08 +00:00
|
|
|
|
rowptr += context->pixbuf->art_pixbuf->rowstride;
|
1999-10-29 22:37:27 +00:00
|
|
|
|
}
|
1999-10-29 23:07:23 +00:00
|
|
|
|
|
1999-10-29 22:37:27 +00:00
|
|
|
|
nlines = jpeg_read_scanlines (cinfo, lines,
|
|
|
|
|
cinfo->rec_outbuf_height);
|
|
|
|
|
if (nlines == 0)
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
/* handle gray */
|
|
|
|
|
if (cinfo->output_components == 1)
|
|
|
|
|
explode_gray_into_buf (cinfo, lines);
|
|
|
|
|
|
1999-10-29 22:43:51 +00:00
|
|
|
|
context->dptr += nlines * context->pixbuf->art_pixbuf->rowstride;
|
1999-11-03 22:00:27 +00:00
|
|
|
|
|
1999-11-04 20:02:37 +00:00
|
|
|
|
/* send updated signal */
|
|
|
|
|
(* context->updated_func) (context->pixbuf,
|
|
|
|
|
context->user_data,
|
|
|
|
|
0,
|
|
|
|
|
cinfo->output_scanline-1,
|
|
|
|
|
cinfo->image_width,
|
|
|
|
|
nlines);
|
|
|
|
|
|
1999-11-03 22:00:27 +00:00
|
|
|
|
#undef DEBUG_JPEG_PROGRESSIVE
|
1999-10-29 22:37:27 +00:00
|
|
|
|
#ifdef DEBUG_JPEG_PROGRESSIVE
|
|
|
|
|
|
|
|
|
|
if (start_scanline != cinfo->output_scanline)
|
|
|
|
|
g_print("jpeg: Input pass=%2d, next input scanline=%3d,"
|
|
|
|
|
" emitted %3d - %3d\n",
|
|
|
|
|
cinfo->input_scan_number, cinfo->input_iMCU_row * 16,
|
|
|
|
|
start_scanline, cinfo->output_scanline - 1);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
g_print ("Scanline %d of %d - ",
|
|
|
|
|
cinfo->output_scanline,
|
|
|
|
|
cinfo->output_height);
|
|
|
|
|
/* g_print ("rec_height %d -", cinfo->rec_outbuf_height); */
|
|
|
|
|
g_print ("Processed %d lines - bytes left = %d\n",
|
|
|
|
|
nlines, cinfo->src->bytes_in_buffer);
|
|
|
|
|
#endif
|
|
|
|
|
}
|
1999-10-29 23:07:23 +00:00
|
|
|
|
/* did entire image */
|
1999-11-03 22:00:27 +00:00
|
|
|
|
if (cinfo->output_scanline >= cinfo->output_height)
|
|
|
|
|
return TRUE;
|
|
|
|
|
else
|
|
|
|
|
continue;
|
1999-10-29 22:37:27 +00:00
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
|
}
|