use gdk_pixbuf_new_from_stream(). fixed up item factory so inlined pixbufs

Tue Jun 26 10:04:30 2001  Tim Janik  <timj@gtk.org>

        * gtk/gtkiconfactory.c:
        * gtk/gtkitemfactory.c: use gdk_pixbuf_new_from_stream(). fixed up
        item factory so inlined pixbufs actually work.

Tue Jun 26 09:48:02 2001  Tim Janik  <timj@gtk.org>

        * Makefile.am (noinst_PROGRAMS): get rid of make-inline-pixbuf

        * gdk-pixbuf-data.[hc]: provide gdk_pixbuf_new_from_stream()
        instead from gdk_pixbuf_new_from_inline().

        * gdk-pixdata.[hc]: auxillary GdkPixdata structure, public
        installed API for applications that need to serialize/deserialize
        on their own (gimp, BEAST).

        * gdk-pixbuf/gdk-pixbuf-csource.c: provide publically installed
        program that can dump images in CSource format and Pixbuf
        stream format. supports RLE encoding, MACRO formatting etc...
        invoke with --help.

1 files changed, 817 insertions, 0 deletions

diff --git a/gdk-pixbuf/gdk-pixdata.c b/gdk-pixbuf/gdk-pixdata.c
new file mode 100644
index 000000000..bc1b6a646
--- /dev/null
+++ b/gdk-pixbuf/gdk-pixdata.c
@@ -0,0 +1,817 @@
+/* GdkPixbuf library - GdkPixdata - functions for inlined pixbuf handling
+ * Copyright (C) 1999, 2001 Tim Janik
+ *
+ * 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 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#include "gdk-pixdata.h"
+
+#include "gdk-pixbuf-private.h"
+#include "gdk-pixbuf-i18n.h"
+
+
+/* --- functions --- */
+static guint
+pixdata_get_length (const GdkPixdata *pixdata)
+{
+  guint bpp, length;
+
+  if ((pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB)
+    bpp = 3;
+  else if ((pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA)
+    bpp = 4;
+  else
+    return 0;	/* invalid format */
+  switch (pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK)
+    {
+      guint8 *rle_buffer;
+      guint max_length;
+    case GDK_PIXDATA_ENCODING_RAW:
+      length = pixdata->rowstride * pixdata->height;
+      break;
+    case GDK_PIXDATA_ENCODING_RLE:
+      /* need an RLE walk to determine size */
+      max_length = pixdata->rowstride * pixdata->height;
+      rle_buffer = pixdata->pixel_data;
+      length = 0;
+      while (length < max_length)
+	{
+	  guint chunk_length = *(rle_buffer++);
+
+	  if (chunk_length & 128)
+	    {
+	      chunk_length = chunk_length - 128;
+	      if (!chunk_length)	/* RLE data corrupted */
+		return 0;
+	      length += chunk_length * bpp;
+	      rle_buffer += bpp;
+	    }
+	  else
+	    {
+	      if (!chunk_length)        /* RLE data corrupted */
+		return 0;
+	      chunk_length *= bpp;
+	      length += chunk_length;
+	      rle_buffer += chunk_length;
+	    }
+	}
+      length = rle_buffer - pixdata->pixel_data;
+      break;
+    default:
+      length = 0;
+      break;
+    }
+  return length;
+}
+
+/**
+ * gdk_pixdata_serialize:
+ * @pixdata: A valid GdkPixdata structure to serialize
+ * @stream_length_p: Location to store the resulting stream length in
+ *
+ * Serialize a #GdkPixdata structure into a byte stream.
+ * The byte stream consists of a straight forward write out of the
+ * #GdkPixdata fields in network byte order, plus the pixel_data
+ * bytes the structure points to.
+ *
+ * Return value: A newly-allocated string containing the serialized
+ * GdkPixdata structure
+ **/
+guint8* /* free result */
+gdk_pixdata_serialize (const GdkPixdata *pixdata,
+		       guint            *stream_length_p)
+{
+  guint8 *stream, *s;
+  guint32 *istream;
+  guint length;
+
+  /* check args passing */
+  g_return_val_if_fail (pixdata != NULL, NULL);
+  g_return_val_if_fail (stream_length_p != NULL, NULL);
+  /* check pixdata contents */
+  g_return_val_if_fail (pixdata->magic == GDK_PIXBUF_MAGIC_NUMBER, NULL);
+  g_return_val_if_fail (pixdata->width > 0, NULL);
+  g_return_val_if_fail (pixdata->height > 0, NULL);
+  g_return_val_if_fail (pixdata->rowstride >= pixdata->width, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB ||
+			(pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_SAMPLE_WIDTH_MASK) == GDK_PIXDATA_SAMPLE_WIDTH_8, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RAW ||
+			(pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RLE, NULL);
+  g_return_val_if_fail (pixdata->pixel_data != NULL, NULL);
+
+  length = pixdata_get_length (pixdata);
+
+  /* check length field */
+  g_return_val_if_fail (length != 0, NULL);
+  
+  stream = g_malloc (GDK_PIXDATA_HEADER_LENGTH + length);
+  istream = (guint32*) stream;
+
+  /* store header */
+  *istream++ = g_htonl (GDK_PIXBUF_MAGIC_NUMBER);
+  *istream++ = g_htonl (GDK_PIXDATA_HEADER_LENGTH + length);
+  *istream++ = g_htonl (pixdata->pixdata_type);
+  *istream++ = g_htonl (pixdata->rowstride);
+  *istream++ = g_htonl (pixdata->width);
+  *istream++ = g_htonl (pixdata->height);
+
+  /* copy pixel data */
+  s = (guint8*) istream;
+  memcpy (s, pixdata->pixel_data, length);
+  s += length;
+
+  *stream_length_p = GDK_PIXDATA_HEADER_LENGTH + length;
+  g_assert (s - stream == *stream_length_p);	/* paranoid */
+
+  return stream;
+}
+
+#define	return_header_corrupt(error)	{ \
+  g_set_error (error, GDK_PIXBUF_ERROR, \
+	       GDK_PIXBUF_ERROR_HEADER_CORRUPT, _("Image header corrupt")); \
+  return FALSE; \
+}
+#define	return_invalid_format(error)	{ \
+  g_set_error (error, GDK_PIXBUF_ERROR, \
+	       GDK_PIXBUF_ERROR_UNKNOWN_FORMAT, _("Image format unknown")); \
+  return FALSE; \
+}
+#define	return_pixel_corrupt(error)	{ \
+  g_set_error (error, GDK_PIXBUF_ERROR, \
+	       GDK_PIXBUF_ERROR_PIXEL_CORRUPT, _("Image pixel data corrupt")); \
+  return FALSE; \
+}
+
+/**
+ * gdk_pixdata_deserialize:
+ * @pixdata: A GdkPixdata structure to be filled in
+ * @stream_length: Length of the stream used for deserialization
+ * @stream: Stream of bytes containing a serialized pixdata structure
+ * @error: GError location to indicate failures (maybe NULL to ignore errors)
+ *
+ * Deserialize (reconstruct) a #GdkPixdata structure from a byte stream.
+ * The byte stream consists of a straight forward write out of the
+ * #GdkPixdata fields in network byte order, plus the pixel_data
+ * bytes the structure points to.
+ * The pixdata contents are reconstructed byte by byte and are checked
+ * for validity, due to the checks, this function may prematurely abort
+ * with errors, such as #GDK_PIXBUF_ERROR_HEADER_CORRUPT,
+ * #GDK_PIXBUF_ERROR_PIXEL_CORRUPT or #GDK_PIXBUF_ERROR_UNKNOWN_FORMAT.
+ *
+ * Return value: Upon successfull deserialization #TRUE is returned,
+ * #FALSE otherwise
+ **/
+gboolean
+gdk_pixdata_deserialize (GdkPixdata   *pixdata,
+			 guint         stream_length,
+			 const guint8 *stream,
+			 GError	     **error)
+{
+  guint32 *istream;
+  guint color_type, sample_width, encoding;
+
+  g_return_val_if_fail (pixdata != NULL, FALSE);
+  if (stream_length < GDK_PIXDATA_HEADER_LENGTH)
+    return_header_corrupt (error);
+  g_return_val_if_fail (stream != NULL, FALSE);
+
+
+  /* deserialize header */
+  istream = (guint32*) stream;
+  pixdata->magic = g_ntohl (*istream++);
+  pixdata->length = g_ntohl (*istream++);
+  if (pixdata->magic != GDK_PIXBUF_MAGIC_NUMBER || pixdata->length < GDK_PIXDATA_HEADER_LENGTH)
+    return_header_corrupt (error);
+  pixdata->pixdata_type = g_ntohl (*istream++);
+  pixdata->rowstride = g_ntohl (*istream++);
+  pixdata->width = g_ntohl (*istream++);
+  pixdata->height = g_ntohl (*istream++);
+  if (pixdata->width < 1 || pixdata->height < 1 ||
+      pixdata->rowstride < pixdata->width)
+    return_header_corrupt (error);
+  color_type = pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK;
+  sample_width = pixdata->pixdata_type & GDK_PIXDATA_SAMPLE_WIDTH_MASK;
+  encoding = pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK;
+  if ((color_type != GDK_PIXDATA_COLOR_TYPE_RGB &&
+       color_type != GDK_PIXDATA_COLOR_TYPE_RGBA) ||
+      sample_width != GDK_PIXDATA_SAMPLE_WIDTH_8 ||
+      (encoding != GDK_PIXDATA_ENCODING_RAW &&
+       encoding != GDK_PIXDATA_ENCODING_RLE))
+    return_invalid_format (error);
+
+  /* deserialize pixel data */
+  if (stream_length < pixdata->length - GDK_PIXDATA_HEADER_LENGTH)
+    return_pixel_corrupt (error);
+  pixdata->pixel_data = (guint8*) istream;
+
+  return TRUE;
+}
+
+static gboolean
+diff2_rgb (guint8 *ip)
+{
+  return ip[0] != ip[3] || ip[1] != ip[4] || ip[2] != ip[5];
+}
+
+static gboolean
+diff2_rgba (guint8 *ip)
+{
+  return ip[0] != ip[4] || ip[1] != ip[5] || ip[2] != ip[6] || ip[3] != ip[7];
+}
+
+static guint8*			/* dest buffer bound */
+rl_encode_rgbx (guint8 *bp,	/* dest buffer */
+		guint8 *ip,	/* image pointer */
+		guint8 *limit,	/* image upper bound */
+		guint   n_ch)
+{
+  gboolean (*diff2_pix) (guint8 *) = n_ch > 3 ? diff2_rgba : diff2_rgb;
+  guint8 *ilimit = limit - n_ch;
+
+  while (ip < limit)
+    {
+      g_assert (ip < ilimit); /* paranoid */
+
+      if (diff2_pix (ip))
+	{
+	  guint8 *s_ip = ip;
+	  guint l = 1;
+
+	  ip += n_ch;
+	  while (l < 127 && ip < ilimit && diff2_pix (ip))
+	    { ip += n_ch; l += 1; }
+	  if (ip == ilimit && l < 127)
+	    { ip += n_ch; l += 1; }
+	  *(bp++) = l;
+	  memcpy (bp, s_ip, l * n_ch);
+	  bp += l * n_ch;
+	}
+      else
+	{
+	  guint l = 2;
+
+	  ip += n_ch;
+	  while (l < 127 && ip < ilimit && !diff2_pix (ip))
+	    { ip += n_ch; l += 1; }
+	  *(bp++) = l | 128;
+	  memcpy (bp, ip, n_ch);
+	  ip += n_ch;
+	  bp += n_ch;
+	}
+      if (ip == ilimit)
+	{
+	  *(bp++) = 1;
+	  memcpy (bp, ip, n_ch);
+	  ip += n_ch;
+	  bp += n_ch;
+	}
+    }
+
+  return bp;
+}
+
+gpointer
+gdk_pixdata_from_pixbuf (GdkPixdata      *pixdata,
+			 const GdkPixbuf *pixbuf,
+			 gboolean         use_rle)
+{
+  gpointer free_me = NULL;
+  guint height, rowstride, encoding, bpp, length;
+  guint8 *img_buffer;
+
+  g_return_val_if_fail (pixdata != NULL, NULL);
+  g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
+  g_return_val_if_fail (pixbuf->bits_per_sample == 8, NULL);
+  g_return_val_if_fail ((pixbuf->n_channels == 3 && !pixbuf->has_alpha) ||
+			(pixbuf->n_channels == 4 && pixbuf->has_alpha), NULL);
+  g_return_val_if_fail (pixbuf->rowstride >= pixbuf->width, NULL);
+
+  height = pixbuf->height;
+  rowstride = pixbuf->rowstride;
+  encoding = use_rle ? GDK_PIXDATA_ENCODING_RLE : GDK_PIXDATA_ENCODING_RAW;
+  bpp = pixbuf->has_alpha ? 4 : 3;
+
+  if (encoding == GDK_PIXDATA_ENCODING_RLE)
+    {
+      guint pad, n_bytes = rowstride * height;
+      guint8 *img_buffer_end, *data;
+
+      pad = rowstride;
+      pad = MAX (pad, 130 + n_bytes / 127);
+      data = g_new (guint8, pad + n_bytes);
+      free_me = data;
+      img_buffer = data;
+      img_buffer_end = rl_encode_rgbx (img_buffer,
+				       pixbuf->pixels, pixbuf->pixels + n_bytes,
+				       bpp);
+      length = img_buffer_end - img_buffer;
+    }
+  else
+    {
+      img_buffer = pixbuf->pixels;
+      length = rowstride * height;
+    }
+
+  pixdata->magic = GDK_PIXBUF_MAGIC_NUMBER;
+  pixdata->length = GDK_PIXDATA_HEADER_LENGTH + length;
+  pixdata->pixdata_type = pixbuf->has_alpha ? GDK_PIXDATA_COLOR_TYPE_RGBA : GDK_PIXDATA_COLOR_TYPE_RGB;
+  pixdata->pixdata_type |= GDK_PIXDATA_SAMPLE_WIDTH_8;
+  pixdata->pixdata_type |= encoding;
+  pixdata->rowstride = rowstride;
+  pixdata->width = pixbuf->width;
+  pixdata->height = height;
+  pixdata->pixel_data = img_buffer;
+
+  return free_me;
+}
+
+GdkPixbuf*
+gdk_pixbuf_from_pixdata (const GdkPixdata *pixdata,
+			 gboolean          copy_pixels,
+			 GError          **error)
+{
+  guint encoding, bpp;
+  guint8 *data = NULL;
+
+  g_return_val_if_fail (pixdata != NULL, NULL);
+  g_return_val_if_fail (pixdata->width > 0, NULL);
+  g_return_val_if_fail (pixdata->height > 0, NULL);
+  g_return_val_if_fail (pixdata->rowstride >= pixdata->width, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB ||
+			(pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_SAMPLE_WIDTH_MASK) == GDK_PIXDATA_SAMPLE_WIDTH_8, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RAW ||
+			(pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RLE, NULL);
+  g_return_val_if_fail (pixdata->pixel_data != NULL, NULL);
+
+  bpp = (pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB ? 3 : 4;
+  encoding = pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK;
+  if (encoding == GDK_PIXDATA_ENCODING_RLE)
+    copy_pixels = TRUE;
+  if (copy_pixels)
+    {
+      data = g_try_malloc (pixdata->rowstride * pixdata->height);
+      if (!data)
+	{
+	  g_set_error (error, GDK_PIXBUF_ERROR,
+		       GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
+		       _("failed to allocate imagge buffer of %u bytes"),
+		       pixdata->rowstride * pixdata->height);
+	  return NULL;
+	}
+    }
+  if (encoding == GDK_PIXDATA_ENCODING_RLE)
+    {
+      const guint8 *rle_buffer = pixdata->pixel_data;
+      guint8 *image_buffer = data;
+      guint8 *image_limit = data + pixdata->rowstride * pixdata->height;
+      gboolean check_overrun = FALSE;
+
+      while (image_buffer < image_limit)
+	{
+	  guint length = *(rle_buffer++);
+
+	  if (length & 128)
+	    {
+	      length = length - 128;
+	      check_overrun = image_buffer + length * bpp > image_limit;
+	      if (check_overrun)
+		length = (image_limit - image_buffer) / bpp;
+	      if (bpp < 4)	/* RGB */
+		do
+		  {
+		    memcpy (image_buffer, rle_buffer, 3);
+		    image_buffer += 3;
+		  }
+		while (--length);
+	      else		/* RGBA */
+		do
+		  {
+		    memcpy (image_buffer, rle_buffer, 4);
+		    image_buffer += 4;
+		  }
+		while (--length);
+	      rle_buffer += bpp;
+	    }
+	  else
+	    {
+	      length *= bpp;
+	      check_overrun = image_buffer + length > image_limit;
+	      if (check_overrun)
+		length = image_limit - image_buffer;
+	      memcpy (image_buffer, rle_buffer, length);
+	      image_buffer += length;
+	      rle_buffer += length;
+	    }
+	}
+      if (check_overrun)
+	{
+	  g_free (data);
+	  g_set_error (error, GDK_PIXBUF_ERROR,
+		       GDK_PIXBUF_ERROR_PIXEL_CORRUPT,
+		       _("Image pixel data corrupt"));
+	  return NULL;
+	}
+    }
+  else if (copy_pixels)
+    memcpy (data, pixdata->pixel_data, pixdata->rowstride * pixdata->height);
+  else
+    data = pixdata->pixel_data;
+
+  return gdk_pixbuf_new_from_data (data, GDK_COLORSPACE_RGB,
+				   (pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA,
+				   8, pixdata->width, pixdata->height, pixdata->rowstride,
+				   copy_pixels ? (GdkPixbufDestroyNotify) g_free : NULL, data);
+}
+
+typedef struct {
+  /* config */
+  gboolean     dump_stream;
+  gboolean     dump_struct;
+  gboolean     dump_macros;
+  gboolean     dump_gtypes;
+  gboolean     dump_rle_decoder;
+  const gchar *static_prefix;
+  const gchar *const_prefix;
+  /* runtime */
+  GString *gstring;
+  guint    pos;
+  gboolean pad;
+} CSourceData;
+
+static inline void
+save_uchar (CSourceData *cdata,
+	    guint8       d)
+{
+  GString *gstring = cdata->gstring;
+
+  if (cdata->pos > 70)
+    {
+      if (cdata->dump_struct || cdata->dump_stream)
+	{
+	  g_string_append (gstring, "\"\n  \"");
+	  cdata->pos = 3;
+	  cdata->pad = FALSE;
+	}
+      if (cdata->dump_macros)
+	{
+	  g_string_append (gstring, "\" \\\n  \"");
+	  cdata->pos = 3;
+	  cdata->pad = FALSE;
+	}
+    }
+  if (d < 33 || d > 126)
+    {
+      g_string_printfa (gstring, "\\%o", d);
+      cdata->pos += 1 + 1 + (d > 7) + (d > 63);
+      cdata->pad = d < 64;
+      return;
+    }
+  if (d == '\\')
+    {
+      g_string_append (gstring, "\\\\");
+      cdata->pos += 2;
+    }
+  else if (d == '"')
+    {
+      g_string_append (gstring, "\\\"");
+      cdata->pos += 2;
+    }
+  else if (cdata->pad && d >= '0' && d <= '9')
+    {
+      g_string_append (gstring, "\"\"");
+      g_string_append_c (gstring, d);
+      cdata->pos += 3;
+    }
+  else
+    {
+      g_string_append_c (gstring, d);
+      cdata->pos += 1;
+    }
+  cdata->pad = FALSE;
+  return;
+}
+
+static inline void
+save_rle_decoder (GString     *gstring,
+		  const gchar *macro_name,
+		  const gchar *s_uint,
+		  const gchar *s_uint_8,
+		  guint        n_ch)
+{
+  g_string_printfa (gstring, "#define %s_RUN_LENGTH_DECODE(image_buf, rle_data, size, bpp) do \\\n",
+		    macro_name);
+  g_string_printfa (gstring, "{ %s __bpp; %s *__ip; const %s *__il, *__rd; \\\n", s_uint, s_uint_8, s_uint_8);
+  g_string_printfa (gstring, "  __bpp = (bpp); __ip = (image_buf); __il = __ip + (size) * __bpp; \\\n");
+  
+  g_string_printfa (gstring, "  __rd = (rle_data); if (__bpp > 3) { /* RGBA */ \\\n");
+  
+  g_string_printfa (gstring, "    while (__ip < __il) { %s __l = *(__rd++); \\\n", s_uint);
+  g_string_printfa (gstring, "      if (__l & 128) { __l = __l - 128; \\\n");
+  g_string_printfa (gstring, "        do { memcpy (__ip, __rd, 4); __ip += 4; } while (--__l); __rd += 4; \\\n");
+  g_string_printfa (gstring, "      } else { __l *= 4; memcpy (__ip, __rd, __l); \\\n");
+  g_string_printfa (gstring, "               __ip += __l; __rd += __l; } } \\\n");
+  
+  g_string_printfa (gstring, "  } else { /* RGB */ \\\n");
+  
+  g_string_printfa (gstring, "    while (__ip < __il) { %s __l = *(__rd++); \\\n", s_uint);
+  g_string_printfa (gstring, "      if (__l & 128) { __l = __l - 128; \\\n");
+  g_string_printfa (gstring, "        do { memcpy (__ip, __rd, 3); __ip += 3; } while (--__l); __rd += 3; \\\n");
+  g_string_printfa (gstring, "      } else { __l *= 3; memcpy (__ip, __rd, __l); \\\n");
+  g_string_printfa (gstring, "               __ip += __l; __rd += __l; } } \\\n");
+  
+  g_string_printfa (gstring, "  } } while (0)\n");
+}
+
+GString*
+gdk_pixdata_to_csource (GdkPixdata        *pixdata,
+			const gchar	  *name,
+			GdkPixdataDumpType dump_type)
+{
+  CSourceData cdata = { 0, };
+  gchar *s_uint_8, *s_uint_32, *s_uint, *s_char, *s_null;
+  guint bpp, width, height, rowstride;
+  gboolean rle_encoded;
+  gchar *macro_name;
+  guint8 *img_buffer, *img_buffer_end, *stream;
+  guint stream_length;
+  GString *gstring;
+  
+  /* check args passing */
+  g_return_val_if_fail (pixdata != NULL, NULL);
+  g_return_val_if_fail (name != NULL, NULL);
+  /* check pixdata contents */
+  g_return_val_if_fail (pixdata->magic == GDK_PIXBUF_MAGIC_NUMBER, NULL);
+  g_return_val_if_fail (pixdata->width > 0, NULL);
+  g_return_val_if_fail (pixdata->height > 0, NULL);
+  g_return_val_if_fail (pixdata->rowstride >= pixdata->width, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB ||
+			(pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGBA, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_SAMPLE_WIDTH_MASK) == GDK_PIXDATA_SAMPLE_WIDTH_8, NULL);
+  g_return_val_if_fail ((pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RAW ||
+			(pixdata->pixdata_type & GDK_PIXDATA_ENCODING_MASK) == GDK_PIXDATA_ENCODING_RLE, NULL);
+  g_return_val_if_fail (pixdata->pixel_data != NULL, NULL);
+
+  img_buffer = pixdata->pixel_data;
+  if (pixdata->length < 1)
+    img_buffer_end = img_buffer + pixdata_get_length (pixdata);
+  else
+    img_buffer_end = img_buffer + pixdata->length - GDK_PIXDATA_HEADER_LENGTH;
+  g_return_val_if_fail (img_buffer < img_buffer_end, NULL);
+
+  bpp = (pixdata->pixdata_type & GDK_PIXDATA_COLOR_TYPE_MASK) == GDK_PIXDATA_COLOR_TYPE_RGB ? 3 : 4;
+  width = pixdata->width;
+  height = pixdata->height;
+  rowstride = pixdata->rowstride;
+  rle_encoded = (pixdata->pixdata_type & GDK_PIXDATA_ENCODING_RLE) > 0;
+  macro_name = g_strdup (name);
+  g_strup (macro_name);
+
+  cdata.dump_macros = (dump_type & GDK_PIXDATA_DUMP_MACROS) > 0;
+  cdata.dump_struct = (dump_type & GDK_PIXDATA_DUMP_PIXDATA_STRUCT) > 0;
+  cdata.dump_stream = !cdata.dump_macros && !cdata.dump_struct;
+  g_return_val_if_fail (cdata.dump_macros + cdata.dump_struct + cdata.dump_stream == 1, NULL);
+
+  cdata.dump_gtypes = (dump_type & GDK_PIXDATA_DUMP_CTYPES) == 0;
+  cdata.dump_rle_decoder = (dump_type & GDK_PIXDATA_DUMP_RLE_DECODER) > 0;
+  cdata.static_prefix = (dump_type & GDK_PIXDATA_DUMP_STATIC) ? "static " : "";
+  cdata.const_prefix = (dump_type & GDK_PIXDATA_DUMP_CONST) ? "const " : "";
+  gstring = g_string_new ("");
+  cdata.gstring = gstring;
+
+  if (!cdata.dump_macros && cdata.dump_gtypes)
+    {
+      s_uint_8 =  "guint8 ";
+      s_uint_32 = "guint32";
+      s_uint =    "guint  ";
+      s_char =    "gchar  ";
+      s_null =    "NULL";
+    }
+  else if (!cdata.dump_macros)
+    {
+      s_uint_8 =  "unsigned char";
+      s_uint_32 = "unsigned int ";
+      s_uint =    "unsigned int ";
+      s_char =    "char         ";
+      s_null =    "(char*) 0";
+    }
+  else if (cdata.dump_macros && cdata.dump_gtypes)
+    {
+      s_uint_8 =  "guint8";
+      s_uint_32 = "guint32";
+      s_uint  =   "guint";
+      s_char =    "gchar";
+      s_null =    "NULL";
+    }
+  else /* cdata.dump_macros && !cdata.dump_gtypes */
+    {
+      s_uint_8 =  "unsigned char";
+      s_uint_32 = "unsigned int";
+      s_uint =    "unsigned int";
+      s_char =    "char";
+      s_null =    "(char*) 0";
+    }
+
+  /* initial comment
+   */
+  g_string_printfa (gstring,
+		    "/* GdkPixbuf %s C-Source image dump %s*/\n\n",
+		    bpp > 3 ? "RGBA" : "RGB",
+		    rle_encoded ? "1-byte-run-length-encoded " : "");
+
+  /* dump RLE decoder for structures
+   */
+  if (cdata.dump_rle_decoder && cdata.dump_struct)
+    save_rle_decoder (gstring,
+		      macro_name,
+		      cdata.dump_gtypes ? "guint" : "unsigned int",
+		      cdata.dump_gtypes ? "guint8" : "unsigned char",
+		      bpp);
+
+  /* format & size blurbs
+   */
+  if (cdata.dump_macros)
+    {
+      g_string_printfa (gstring, "#define %s_ROWSTRIDE (%u)\n",
+			macro_name, rowstride);
+      g_string_printfa (gstring, "#define %s_WIDTH (%u)\n",
+			macro_name, width);
+      g_string_printfa (gstring, "#define %s_HEIGHT (%u)\n",
+			macro_name, height);
+      g_string_printfa (gstring, "#define %s_BYTES_PER_PIXEL (%u) /* 3:RGB, 4:RGBA */\n",
+			macro_name, bpp);
+    }
+  if (cdata.dump_struct)
+    {
+      g_string_printfa (gstring, "%s%sGdkPixdata %s = {\n",
+			cdata.static_prefix, cdata.const_prefix, name);
+      g_string_printfa (gstring, "  0x%x, /* Pixbuf magic: 'GdkP' */\n",
+			GDK_PIXBUF_MAGIC_NUMBER);
+      g_string_printfa (gstring, "  %u + %u, /* header length + pixel_data length */\n",
+			GDK_PIXDATA_HEADER_LENGTH,
+			rle_encoded ? img_buffer_end - img_buffer : rowstride * height);
+      g_string_printfa (gstring, "  0x%x, /* pixdata_type */\n",
+			pixdata->pixdata_type);
+      g_string_printfa (gstring, "  %u, /* rowstride */\n",
+			rowstride);
+      g_string_printfa (gstring, "  %u, /* width */\n",
+			width);
+      g_string_printfa (gstring, "  %u, /* height */\n",
+			height);
+      g_string_printfa (gstring, "  /* pixel_data: */\n");
+    }
+  if (cdata.dump_stream)
+    {
+      guint pix_length = img_buffer_end - img_buffer;
+      
+      stream = gdk_pixdata_serialize (pixdata, &stream_length);
+      img_buffer_end = stream + stream_length;
+
+      g_string_printfa (gstring, "%s%s%s %s[] = \n",
+			cdata.static_prefix, cdata.const_prefix,
+			cdata.dump_gtypes ? "guint8" : "unsigned char",
+			name);
+      g_string_printfa (gstring, "( \"\"\n  /* Pixbuf magic (0x%x) */\n  \"",
+			GDK_PIXBUF_MAGIC_NUMBER);
+      cdata.pos = 3;
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      g_string_printfa (gstring, "\"\n  /* length: header (%u) + pixel_data (%u) */\n  \"",
+			GDK_PIXDATA_HEADER_LENGTH,
+			rle_encoded ? pix_length : rowstride * height);
+      cdata.pos = 3;
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      g_string_printfa (gstring, "\"\n  /* pixdata_type (0x%x) */\n  \"",
+			pixdata->pixdata_type);
+      cdata.pos = 3;
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      g_string_printfa (gstring, "\"\n  /* rowstride (%u) */\n  \"",
+			rowstride);
+      cdata.pos = 3;
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      g_string_printfa (gstring, "\"\n  /* width (%u) */\n  \"", width);
+      cdata.pos = 3;
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      g_string_printfa (gstring, "\"\n  /* height (%u) */\n  \"", height);
+      cdata.pos = 3;
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      save_uchar (&cdata, *stream++); save_uchar (&cdata, *stream++);
+      g_string_printfa (gstring, "\"\n  /* pixel_data: */\n");
+      img_buffer = stream;
+    }
+
+  /* pixel_data intro
+   */
+  if (cdata.dump_macros)
+    {
+      g_string_printfa (gstring, "#define %s_%sPIXEL_DATA ((%s*) \\\n",
+			macro_name,
+			rle_encoded ? "RLE_" : "",
+			s_uint_8);
+      g_string_printfa (gstring, "  \"");
+      cdata.pos = 2;
+    }
+  if (cdata.dump_struct)
+    {
+      g_string_printfa (gstring, "  \"");
+      cdata.pos = 3;
+    }
+  if (cdata.dump_stream)
+    {
+      g_string_printfa (gstring, "  \"");
+      cdata.pos = 3;
+    }
+    
+  /* pixel_data
+   */
+  do
+    save_uchar (&cdata, *img_buffer++);
+  while (img_buffer < img_buffer_end);
+
+  /* pixel_data trailer
+   */
+  if (cdata.dump_macros)
+    g_string_printfa (gstring, "\")\n\n");
+  if (cdata.dump_struct)
+    g_string_printfa (gstring, "\",\n};\n\n");
+  if (cdata.dump_stream)
+    g_string_printfa (gstring, "\");\n\n");
+
+  /* dump RLE decoder for macros
+   */
+  if (cdata.dump_rle_decoder && cdata.dump_macros)
+    save_rle_decoder (gstring,
+		      macro_name,
+		      cdata.dump_gtypes ? "guint" : "unsigned int",
+		      cdata.dump_gtypes ? "guint8" : "unsigned char",
+		      bpp);
+
+  /* cleanup
+   */
+  g_free (macro_name);
+  
+  return gstring;
+}
+
+/**
+ * gdk_pixbuf_new_from_stream:
+ * @stream_length: Length in bytes of the @stream argument
+ * @stream: Byte stream containing a serialized GdkPixdata structure
+ * @copy_pixels: Whether to copy the pixels data, or keep direct pointers into the
+ *               stream data for the resulting pixbuf
+ * @error: GError return location, may be NULL to ignore errors
+ *
+ * Create a #GdkPixbuf from a serialized GdkPixdata structure.
+ * Gtk+ ships with a program called gdk-pixbuf-csource which allowes
+ * for conversion of #GdkPixbufs into various kinds of C sources.
+ * This is useful if you want to ship a program with images, but
+ * don't want to depend on any external files.
+ *
+ * Since the inline pixbuf is read-only static data, you
+ * don't need to copy it unless you intend to write to it.
+ * For deserialization of streams that are run length encoded, the
+ * decoded data is always a copy of the input stream.
+ *
+ * If you create a pixbuf from const inline data compiled into your
+ * program, it's probably safe to ignore errors, since things will
+ * always succeed.  For non-const inline data, you could get out of
+ * memory. For untrusted inline data located at runtime, you could
+ * have corrupt inline data in addition.
+ *
+ * Return value: A newly-created #GdkPixbuf structure with a reference count of
+ * 1, or NULL If error is set.
+ **/
+GdkPixbuf*
+gdk_pixbuf_new_from_stream (gint          stream_length,
+			    const guint8 *stream,
+			    gboolean      copy_pixels,
+			    GError      **error)
+{
+  GdkPixdata pixdata;
+
+  if (stream_length != -1)
+    g_return_val_if_fail (stream_length > GDK_PIXDATA_HEADER_LENGTH, NULL);
+  g_return_val_if_fail (stream != NULL, NULL);
+
+  if (!gdk_pixdata_deserialize (&pixdata, stream_length, stream, error))
+    return NULL;
+
+  return gdk_pixbuf_from_pixdata (&pixdata, copy_pixels, error);
+}