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[gdk-pixbuf] Add pure gdk-pixbuf tests from GTK+

commit c77574b63ca97c85267f609591192391a0013c77
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jun 26 01:07:27 2010 -0400

    Add pure gdk-pixbuf tests from GTK+

 Makefile.am                      |    2 +-
 configure.ac                     |    1 +
 tests/Makefile.am                |   30 +++++
 tests/pixbuf-lowmem.c            |  249 ++++++++++++++++++++++++++++++++++++++
 tests/pixbuf-random.c            |  170 ++++++++++++++++++++++++++
 tests/pixbuf-randomly-modified.c |  159 ++++++++++++++++++++++++
 tests/pixbuf-read.c              |   87 +++++++++++++
 tests/pixbuf-threads.c           |  118 ++++++++++++++++++
 8 files changed, 815 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 32eb764..9f846fb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 include $(top_srcdir)/Makefile.decl
 
-SUBDIRS = gdk-pixbuf po docs
+SUBDIRS = gdk-pixbuf po docs tests
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = gdk-pixbuf-2.0.pc
diff --git a/configure.ac b/configure.ac
index 47554ae..70785c2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1007,6 +1007,7 @@ docs/reference/Makefile
 docs/reference/gdk-pixbuf/Makefile
 docs/reference/gdk-pixbuf/version.xml
 po/Makefile.in
+tests/Makefile
 ])
 
 AC_OUTPUT
diff --git a/tests/Makefile.am b/tests/Makefile.am
new file mode 100644
index 0000000..7129c42
--- /dev/null
+++ b/tests/Makefile.am
@@ -0,0 +1,30 @@
+include $(top_srcdir)/Makefile.decl
+
+INCLUDES =				\
+	-I$(top_srcdir)			\
+	-I$(top_srcdir)/gdk-pixbuf	\
+	$(GDK_PIXBUF_DEBUG_FLAGS)	\
+	$(GDK_PIXBUF_DEP_CFLAGS)
+
+DEPS = \
+	$(top_builddir)/gdk-pixbuf/libgdk_pixbuf-$(GDK_PIXBUF_API_VERSION).la
+
+LDADDS = \
+	$(top_builddir)/gdk-pixbuf/libgdk_pixbuf-$(GDK_PIXBUF_API_VERSION).la \
+	$(GDK_PIXBUF_DEP_LIBS)
+
+noinst_PROGRAMS = \
+	pixbuf-read			\
+	pixbuf-lowmem			\
+	pixbuf-randomly-modified	\
+	pixbuf-random			\
+	pixbuf-threads
+
+pixbuf_read_LDADD = $(LDADDS)
+pixbuf_lowmem_LDADD = $(LDADDS)
+pixbuf_randomly_modified_LDADD = $(LDADDS)
+pixbuf_random_LDADD = $(LDADDS)
+pixbuf_threads_LDADD = $(LDADDS) $(GLIB_LIBS)
+
+
+-include $(top_srcdir)/git.mk
diff --git a/tests/pixbuf-lowmem.c b/tests/pixbuf-lowmem.c
new file mode 100644
index 0000000..172c162
--- /dev/null
+++ b/tests/pixbuf-lowmem.c
@@ -0,0 +1,249 @@
+/* -*- Mode: C; c-basic-offset: 2; -*- */
+/* GdkPixbuf library - test loaders
+ *
+ * Copyright (C) 2001 Søren Sandmann (sandmann daimi au dk)
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "gdk-pixbuf/gdk-pixbuf.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+#define PRETEND_MEM_SIZE (16 * 1024 * 1024)
+#define REMAINING_MEM_SIZE 100000
+
+
+static int current_allocation = 0;
+static int max_allocation = 0;
+
+#define HEADER_SPACE sizeof(void*)
+
+static gpointer
+record_bytes (gpointer mem, gsize bytes)
+{
+  if (mem == NULL ||
+      (current_allocation + bytes) > max_allocation)
+    {
+      if (mem)
+        free (mem);
+      
+      return NULL;
+    }
+  
+  *(void **)mem = GINT_TO_POINTER (bytes);
+
+  g_assert (GPOINTER_TO_INT (*(void**)mem) == bytes);
+  
+  g_assert (current_allocation >= 0);
+  current_allocation += bytes;
+  g_assert (current_allocation >= 0);
+  
+  g_assert ( mem == (void*) ((((char*)mem) + HEADER_SPACE) - HEADER_SPACE) );
+  return ((char*)mem) + HEADER_SPACE;
+}
+
+static gpointer
+limited_try_malloc (gsize n_bytes)
+{
+  return record_bytes (malloc (n_bytes + HEADER_SPACE), n_bytes);
+}
+
+static gpointer
+limited_malloc (gsize n_bytes)
+{
+  return limited_try_malloc (n_bytes);
+}
+
+static gpointer
+limited_calloc (gsize n_blocks,
+                gsize n_block_bytes)
+{
+  int bytes = n_blocks * n_block_bytes + HEADER_SPACE;
+  gpointer mem = malloc (bytes);
+  memset (mem, 0, bytes);
+  return record_bytes (mem, n_blocks * n_block_bytes);
+}
+
+static void
+limited_free (gpointer mem)
+{
+  gpointer real = ((char*)mem) - HEADER_SPACE;
+
+  g_assert (current_allocation >= 0);
+  current_allocation -= GPOINTER_TO_INT (*(void**)real);
+  g_assert (current_allocation >= 0);
+  
+  free (real);
+}
+
+static gpointer
+limited_try_realloc (gpointer mem,
+                     gsize    n_bytes)
+{
+  if (mem == NULL)
+    {
+      return limited_try_malloc (n_bytes);
+    }
+  else
+    {
+      gpointer real;
+
+      g_assert (mem);
+
+      real = ((char*)mem) - HEADER_SPACE;
+      
+      g_assert (current_allocation >= 0);
+      current_allocation -= GPOINTER_TO_INT (*(void**)real);
+      g_assert (current_allocation >= 0);
+
+      return record_bytes (realloc (real, n_bytes + HEADER_SPACE), n_bytes);
+    }
+}
+
+static gpointer
+limited_realloc (gpointer mem,
+                 gsize    n_bytes)
+{
+  return limited_try_realloc (mem, n_bytes);
+}
+
+static GMemVTable limited_table = {
+  limited_malloc,
+  limited_realloc,
+  limited_free,
+  limited_calloc,
+  limited_try_malloc,
+  limited_try_realloc
+};
+
+static void
+mem_test (const gchar *bytes, gsize len)
+{
+  gboolean did_fail = FALSE;
+  GError *err = NULL;
+  GdkPixbufLoader *loader; 
+  GList *loaders = NULL;
+  GList *i;
+  
+  do {
+    loader = gdk_pixbuf_loader_new ();
+    gdk_pixbuf_loader_write (loader, (guchar *) bytes, len, &err);
+    if (err)
+      {
+	g_error_free (err);
+	err = NULL;
+	did_fail = TRUE;
+      }
+    gdk_pixbuf_loader_close (loader, NULL);
+    if (err)
+      {
+	g_error_free (err);
+	err = NULL;
+	did_fail = TRUE;
+      }
+    loaders = g_list_prepend (loaders, loader);
+  } while (!did_fail);
+  
+  for (i = loaders; i != NULL; i = i->next)
+    g_object_unref (i->data);
+  g_list_free (loaders);
+}
+
+static void
+almost_exhaust_memory (void)
+{
+  gpointer x = g_malloc (REMAINING_MEM_SIZE);
+  while (g_try_malloc (REMAINING_MEM_SIZE / 10))
+    ;
+  g_free (x);
+}
+
+static void
+usage (void)
+{
+  g_print ("usage: pixbuf-lowmem <pretend_memory_size> <files>\n");
+  exit (EXIT_FAILURE);
+}
+
+int
+main (int argc, char **argv)
+{
+  int i;
+  char *endptr;
+
+  if (argc <= 2)
+    usage();
+  
+  max_allocation = strtol (argv[1], &endptr, 10);
+  if (endptr == argv[1])
+    usage();
+
+  /* Set a malloc which emulates low mem */
+  g_mem_set_vtable (&limited_table);
+  
+  g_type_init ();
+  g_log_set_always_fatal (G_LOG_LEVEL_WARNING | G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
+  
+  /* memory tests */
+
+  /* How do the loaders behave when memory is low?
+     It depends on the state the above tests left the 
+     memory in.
+
+     - Sometimes the png loader tries to report an 
+       "out of memory", but then g_strdup_printf() calls
+       g_malloc(), which fails.
+       
+     - There are unchecked realloc()s inside libtiff, which means it
+       will never work with low memory, unless something drastic is
+       done, like allocating a lot of memory upfront and release it
+       before entering libtiff.  Also, some TIFFReadRGBAImage calls
+       returns successfully, even though they have called the error
+       handler with an 'out of memory' message.
+  */
+
+  almost_exhaust_memory ();
+
+  g_print ("Allocated %dK of %dK, %dK free during tests\n",
+           current_allocation / 1024, max_allocation / 1024,
+           (max_allocation - current_allocation) / 1024);
+
+  for (i = 2; i < argc; ++i)
+    {
+      gchar *contents;
+      gsize size;
+      GError *err = NULL;
+
+      if (!g_file_get_contents (argv[i], &contents, &size, &err))
+	{
+	  g_print ("couldn't read %s: %s\n", argv[i], err->message);
+	  exit (EXIT_FAILURE);
+	}
+      else
+	{
+	  g_print ("%-40s memory            ", argv[i]);
+	  fflush (stdout);
+	  mem_test (contents, size);
+	  g_print ("\tpassed\n");
+	  g_free (contents);
+	}
+    }
+  
+  return 0;
+}
diff --git a/tests/pixbuf-random.c b/tests/pixbuf-random.c
new file mode 100644
index 0000000..e94b631
--- /dev/null
+++ b/tests/pixbuf-random.c
@@ -0,0 +1,170 @@
+/* -*- Mode: C; c-basic-offset: 2; -*- */
+/* GdkPixbuf library - assault loaders with random data
+ *
+ * Copyright (C) 2001 Søren Sandmann (sandmann daimi au dk)
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "gdk-pixbuf/gdk-pixbuf.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+static void
+assault (const guchar *header, gsize header_size, int n_images)
+{
+  FILE *f;
+  enum { N_CHARACTERS = 10000 };
+
+  int j;
+
+  for (j = 0; j < n_images; ++j)
+    {
+      GError *err = NULL;
+      int i;
+      GdkPixbufLoader *loader;
+      
+      f = fopen ("pixbuf-random-image", "w");
+      if (!f)
+	{
+	  perror ("fopen");
+	  exit (EXIT_FAILURE);
+	}
+  
+      loader = gdk_pixbuf_loader_new ();
+      
+      gdk_pixbuf_loader_write (loader, header, header_size, &err);
+      if (err)
+	{
+	  g_error_free (err);
+	  continue;
+	}
+      
+      for (i = 0; i < N_CHARACTERS; ++i)
+	{
+	  int r = g_random_int ();
+
+	  fwrite (&r, 1, sizeof (r), f);
+	  if (ferror (f))
+	    {
+	      perror ("fwrite");
+	      exit (EXIT_FAILURE);
+	    }
+	  
+	  gdk_pixbuf_loader_write (loader, (guchar *)&r, sizeof (r), &err);
+	  if (err)
+	    {
+	      g_error_free (err);
+	      err = NULL;
+	      break;
+	    }
+	}
+      
+      fclose (f);
+      
+      gdk_pixbuf_loader_close (loader, &err);
+      if (err)
+	{
+	  g_error_free (err);
+	  err = NULL;
+	}
+      
+      g_object_unref (loader);
+    }
+}
+
+static void
+write_seed (int seed)
+{
+  FILE *f;
+  /* write this so you can reproduce failed tests */
+  f = fopen ("pixbuf-random-seed", "w");
+  if (!f)
+    {
+      perror ("fopen");
+      exit (EXIT_FAILURE);
+    }
+  if (fprintf (f, "%d\n", seed) < 0)
+    {
+      perror ("fprintf");
+      exit (EXIT_FAILURE);
+    }
+  if (fclose (f) < 0)
+    {
+      perror ("fclose");
+      exit (EXIT_FAILURE);
+    }
+  g_print ("seed: %d\n", seed);
+}
+
+int
+main (int argc, char **argv)
+{
+  int seed;
+
+  if (argc > 1)
+    seed = atoi (argv[1]);
+  else
+    {
+      seed = time (NULL);
+      write_seed (seed);
+    }
+  g_print ("the last tested image is saved to the file \"pixbuf-random-image\"\n\n");
+
+  g_type_init ();
+  g_log_set_always_fatal (G_LOG_LEVEL_WARNING | G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
+  
+  g_random_set_seed (seed);
+
+#define GIF_HEADER 'G', 'I', 'F', '8', '9', 'a'
+#define PNG_HEADER 0x89, 'P', 'N', 'G', 0x0d, 0x0a, 0x1a, 0x0a
+#define TIFF1_HEADER 'M', 'M', 0x00, 0x2a
+#define TIFF2_HEADER 'I', 'I', 0x2a, 0x00
+#define JPEG_HEADER 0xFF, 0xd8
+#define PNM_HEADER 'P', '6'
+#define XBM_HEADER '#', 'd', 'e', 'f', 'i', 'n', 'e', ' '  
+#define BMP_HEADER 'B', 'M'  
+#define XPM_HEADER '/', '*', ' ', 'X', 'P', 'M', ' ', '*', '/'
+#define RAS_HEADER 0x59, 0xA6, 0x6A, 0x95
+
+#define TEST_RANDOM(header, n_img)				\
+do {								\
+	static guchar h[] = { header };				\
+	g_print (#header);					\
+	fflush (stdout);					\
+	assault (h, sizeof (h), n_img);				\
+	g_print ("\t\tpassed\n");				\
+} while (0)
+
+  for (;;)
+    {
+      TEST_RANDOM (GIF_HEADER,   150);
+      TEST_RANDOM (PNG_HEADER,   110);
+      TEST_RANDOM (JPEG_HEADER,  800);
+      TEST_RANDOM (TIFF1_HEADER, 150);
+      TEST_RANDOM (TIFF2_HEADER, 150);
+      TEST_RANDOM (PNM_HEADER,   150);
+      TEST_RANDOM (XBM_HEADER,   150);
+      TEST_RANDOM (BMP_HEADER,   150);
+      TEST_RANDOM (XPM_HEADER,   150);
+      TEST_RANDOM (RAS_HEADER,   300);
+      g_print ("===========================\n");
+    }
+  
+  return 0;
+}
diff --git a/tests/pixbuf-randomly-modified.c b/tests/pixbuf-randomly-modified.c
new file mode 100644
index 0000000..fb9eac7
--- /dev/null
+++ b/tests/pixbuf-randomly-modified.c
@@ -0,0 +1,159 @@
+/* -*- Mode: C; c-basic-offset: 2; -*- */
+/* GdkPixbuf library - test loaders
+ *
+ * Copyright (C) 2001 Søren Sandmann (sandmann daimi au dk)
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "gdk-pixbuf/gdk-pixbuf.h"
+#include "glib.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+static void
+disaster (const char *what)
+{
+  perror (what);
+  exit (EXIT_FAILURE);
+}
+
+static void
+randomly_modify (const gchar *image, guint size)
+{
+  int i;
+
+  guchar *img_copy = g_malloc (size);
+  g_memmove (img_copy, image, size);
+  
+  for (i = 0; i < size / 4; i++)
+    {
+      FILE *f;
+      GdkPixbufLoader *loader;
+      
+      guint index = g_random_int_range (0, size);
+      guchar byte = g_random_int_range (0, 256);
+      
+      img_copy[index] = byte;
+      f = fopen ("pixbuf-randomly-modified-image", "w");
+      if (!f)
+	disaster ("fopen");
+      fwrite (img_copy, size, 1, f);
+      if (ferror (f))
+	disaster ("fwrite");
+      fclose (f);
+
+      loader = gdk_pixbuf_loader_new ();
+      gdk_pixbuf_loader_write (loader, img_copy, size, NULL);
+      gdk_pixbuf_loader_close (loader, NULL);
+      g_object_unref (loader);
+    }
+  g_free (img_copy);
+}
+
+static void
+write_seed (int seed)
+{
+  FILE *f;
+  /* write this so you can reproduce failed tests */
+  f = fopen ("pixbuf-randomly-modified-seed", "w");
+
+  if (!f)
+    disaster ("fopen");
+
+  if (fprintf (f, "%d\n", seed) < 0)
+    disaster ("fprintf");
+
+  if (fclose (f) < 0)
+    disaster ("fclose");
+
+  g_print ("seed: %d\n", seed);
+}
+
+static void
+usage (void)
+{
+  g_print ("usage: pixbuf-randomly-modified [-s <seed>] <files> ... \n");
+  exit (EXIT_FAILURE);
+}
+
+int
+main (int argc, char **argv)
+{
+  int seed, i;
+  gboolean got_seed = FALSE;
+  GPtrArray *files = g_ptr_array_new ();
+
+  if (argc == 1)
+    usage ();
+  
+  seed = time (NULL);
+
+  for (i = 1; i < argc; ++i)
+    {
+      if (strncmp (argv[i], "-s", 2) == 0)
+	{
+	  if (strlen (argv[i]) > 2)
+	    usage();
+	  if (i+1 < argc)
+	    {
+	      seed = atoi (argv[i+1]);
+	      got_seed = TRUE;
+	      ++i;
+	    }
+	  else
+	    usage();
+	}
+      else
+	g_ptr_array_add (files, strdup (argv[i]));
+    }
+
+  if (!got_seed)
+    write_seed (seed);
+
+  g_random_set_seed (seed);
+
+  g_print ("the last tested image is saved to pixbuf-randomly-modified-image\n");
+  
+  g_type_init ();
+  g_log_set_always_fatal (G_LOG_LEVEL_WARNING | G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
+
+  for (;;)
+    for (i = 0; i < files->len; ++i)
+      {
+	gchar *contents;
+	gsize size;
+	GError *err = NULL;
+	
+	fflush (stdout);
+	if (!g_file_get_contents (files->pdata[i], &contents, &size, &err))
+	  {
+	    g_print ("%s: error: %s\n", (char *)files->pdata[i], err->message);
+	  }
+	else
+	  {
+	    g_print ("%s\t\t", (char *)files->pdata[i]);
+	    randomly_modify (contents, size);
+	    g_print ("done\n");
+	    
+	    g_free (contents);
+	  }
+      }
+  
+  return 0;
+}
diff --git a/tests/pixbuf-read.c b/tests/pixbuf-read.c
new file mode 100644
index 0000000..a65af3f
--- /dev/null
+++ b/tests/pixbuf-read.c
@@ -0,0 +1,87 @@
+/* -*- Mode: C; c-basic-offset: 2; -*- */
+/* GdkPixbuf library - test loaders
+ *
+ * Copyright (C) 2001 Søren Sandmann (sandmann daimi au dk)
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "gdk-pixbuf/gdk-pixbuf.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+static gboolean
+test_loader (const guchar *bytes, gsize len, GError **err)
+{
+  GdkPixbufLoader *loader;
+
+  loader = gdk_pixbuf_loader_new ();
+  gdk_pixbuf_loader_write (loader, bytes, len, err);
+  if (*err)
+      return FALSE;
+  
+  gdk_pixbuf_loader_close (loader, err);
+  if (*err)
+    return FALSE;
+
+  return TRUE;
+}
+
+static void
+usage (void)
+{
+  g_print ("usage: pixbuf-read <files>\n");
+  exit (EXIT_FAILURE);
+}
+  
+int
+main (int argc, char **argv)
+{
+  int i;
+  
+  g_type_init ();
+  g_log_set_always_fatal (G_LOG_LEVEL_WARNING | G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
+
+  if (argc == 1)
+    usage();
+  
+  for (i = 1; i < argc; ++i)
+    {
+      gchar *contents;
+      gsize size;
+      GError *err = NULL;
+      
+      g_print ("%s\t\t", argv[i]);
+      fflush (stdout);
+      if (!g_file_get_contents (argv[i], &contents, &size, &err))
+	{
+	  fprintf (stderr, "%s: error: %s\n", argv[i], err->message);
+	}
+      else
+	{
+	  err = NULL;
+
+	  if (test_loader ((guchar *) contents, size, &err))
+	    g_print ("success\n");
+	  else
+	    g_print ("error: %s\n", err->message);
+
+	  g_free (contents);
+	}
+    }
+  
+  return 0;
+}
diff --git a/tests/pixbuf-threads.c b/tests/pixbuf-threads.c
new file mode 100644
index 0000000..267efe9
--- /dev/null
+++ b/tests/pixbuf-threads.c
@@ -0,0 +1,118 @@
+/* -*- Mode: C; c-basic-offset: 2; -*- */
+/* GdkPixbuf library - test loaders
+ *
+ * Copyright (C) 2004 Matthias Clasen <mclasen redhat com>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+#include "gdk-pixbuf/gdk-pixbuf.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static gboolean verbose = FALSE;
+
+static void
+load_image (gpointer  data, 
+	    gpointer user_data)
+{
+  gchar *filename = data;
+  FILE *file;
+  int nbytes;
+  guchar buf[1024];
+  size_t bufsize = 1024;
+  GdkPixbufLoader *loader;
+  GError *error = NULL;
+  GThread *self;
+
+  self = g_thread_self ();
+  loader = gdk_pixbuf_loader_new ();
+
+  file = fopen (filename, "r");
+  g_assert (file);
+
+  if (verbose) g_print ("%p start image %s\n", self, filename);
+  while (!feof (file)) 
+    {
+      nbytes = fread (buf, 1, bufsize, file);
+      if (!gdk_pixbuf_loader_write (loader, buf, nbytes, &error)) 
+	{
+	  g_warning ("Error writing %s to loader: %s", filename, error->message);
+	  g_error_free (error);
+          error = NULL;
+	  break;
+	}
+      if (verbose) g_print ("%p read %d bytes\n", self, nbytes);
+
+      g_thread_yield ();      
+    }
+
+  fclose (file);
+
+  if (verbose) g_print ("%p finish image %s\n", self, filename);
+
+  if (!gdk_pixbuf_loader_close (loader, &error)) 
+    {
+      g_warning ("Error closing loader for %s: %s", filename, error->message);
+      g_error_free (error);
+    }
+
+  g_object_unref (loader);
+}
+
+static void
+usage (void)
+{
+  g_print ("usage: pixbuf-threads [--verbose] <files>\n");
+  exit (EXIT_FAILURE);
+}
+
+int
+main (int argc, char **argv)
+{
+  int i, start;
+  GThreadPool *pool;
+  
+  g_type_init ();
+
+  if (!g_thread_supported ())
+    g_thread_init (NULL);
+
+  g_log_set_always_fatal (G_LOG_LEVEL_WARNING | G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL);
+
+  if (argc == 1)
+    usage();
+
+  start = 1;
+  if (strcmp (argv[1], "--verbose") == 0)
+    {
+      verbose = TRUE;
+      start = 2;
+    }
+  
+  pool = g_thread_pool_new (load_image, NULL, 20, FALSE, NULL);
+
+  i = start;
+  while (1) {
+    i++;
+    if (i == argc)
+      i = start;
+    g_thread_pool_push (pool, argv[i], NULL);
+  }
+  
+  return 0;
+}
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