/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */

/* GdkPixbuf library - Basic memory management

 *

 * Copyright (C) 1999 The Free Software Foundation

 *

 * Authors: Mark Crichton <crichton@gimp.org>

 *          Miguel de Icaza <miguel@gnu.org>

 *          Federico Mena-Quintero <federico@gimp.org>

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#include "config.h"

#include <math.h>

#include <stdlib.h>

#include <string.h>

#define GDK_PIXBUF_C_COMPILATION

#include "gdk-pixbuf-private.h"

#include "gdk-pixbuf-features.h"

#include "gdk-pixbuf-enum-types.h"

/* Include the marshallers */

#include <glib-object.h>

#include <gio/gio.h>

#include "gdk-pixbuf-marshal.h"

/**

 * SECTION:creating

 * @Short_description: Creating a pixbuf from image data that is already in memory.

 * @Title: Image Data in Memory

 * @See_also: gdk_pixbuf_finalize().

 * 

 * The most basic way to create a pixbuf is to wrap an existing pixel

 * buffer with a #GdkPixbuf structure.  You can use the

 * gdk_pixbuf_new_from_data() function to do this You need to specify

 * the destroy notification function that will be called when the

 * data buffer needs to be freed; this will happen when a #GdkPixbuf

 * is finalized by the reference counting functions If you have a

 * chunk of static data compiled into your application, you can pass

 * in %NULL as the destroy notification function so that the data

 * will not be freed.

 * 

 * The gdk_pixbuf_new() function can be used as a convenience to

 * create a pixbuf with an empty buffer.  This is equivalent to

 * allocating a data buffer using malloc() and then wrapping it with

 * gdk_pixbuf_new_from_data(). The gdk_pixbuf_new() function will

 * compute an optimal rowstride so that rendering can be performed

 * with an efficient algorithm.

 * 

 * As a special case, you can use the gdk_pixbuf_new_from_xpm_data()

 * function to create a pixbuf from inline XPM image data.

 * 

 * You can also copy an existing pixbuf with the gdk_pixbuf_copy()

 * function.  This is not the same as just doing a g_object_ref()

 * on the old pixbuf; the copy function will actually duplicate the

 * pixel data in memory and create a new #GdkPixbuf structure for it.

 */

/**

 * SECTION:refcounting

 * @Short_description: Functions for reference counting and memory management on pixbufs.

 * @Title: Reference Counting and Memory Mangement

 * @See_also: #GdkPixbuf, gdk_pixbuf_new_from_data().

 * 

 * #GdkPixbuf structures are reference counted.  This means that an

 * application can share a single pixbuf among many parts of the

 * code.  When a piece of the program needs to keep a pointer to a

 * pixbuf, it should add a reference to it by calling g_object_ref().

 * When it no longer needs the pixbuf, it should subtract a reference

 * by calling g_object_unref().  The pixbuf will be destroyed when

 * its reference count drops to zero.  Newly-created #GdkPixbuf

 * structures start with a reference count of one.

 * 

 * > As #GdkPixbuf is derived from #GObject now, gdk_pixbuf_ref() and

 * > gdk_pixbuf_unref() are deprecated in favour of g_object_ref()

 * > and g_object_unref() resp.

 * 

 * Finalizing a pixbuf means to free its pixel data and to free the

 * #GdkPixbuf structure itself.  Most of the library functions that

 * create #GdkPixbuf structures create the pixel data by themselves

 * and define the way it should be freed; you do not need to worry

 * about those.

 *

 * To provide preallocated pixel data, use

 * gdk_pixbuf_new_from_bytes().  The gdk_pixbuf_new_from_data() API is

 * an older variant that predates the existence of #GBytes.

 */

static void gdk_pixbuf_finalize     (GObject        *object);

static void gdk_pixbuf_set_property (GObject        *object,

				     guint           prop_id,

				     const GValue   *value,

				     GParamSpec     *pspec);

static void gdk_pixbuf_get_property (GObject        *object,

				     guint           prop_id,

				     GValue         *value,

				     GParamSpec     *pspec);

enum 

{

  PROP_0,

  PROP_COLORSPACE,

  PROP_N_CHANNELS,

  PROP_HAS_ALPHA,

  PROP_BITS_PER_SAMPLE,

  PROP_WIDTH,

  PROP_HEIGHT,

  PROP_ROWSTRIDE,

  PROP_PIXELS,

  PROP_PIXEL_BYTES

};

static void gdk_pixbuf_icon_iface_init (GIconIface *iface);

static void gdk_pixbuf_loadable_icon_iface_init (GLoadableIconIface *iface);

G_DEFINE_TYPE_WITH_CODE (GdkPixbuf, gdk_pixbuf, G_TYPE_OBJECT,

                         G_IMPLEMENT_INTERFACE (G_TYPE_ICON, gdk_pixbuf_icon_iface_init)

                         G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON, gdk_pixbuf_loadable_icon_iface_init))

static void 

gdk_pixbuf_init (GdkPixbuf *pixbuf)

{

  pixbuf->colorspace = GDK_COLORSPACE_RGB;

  pixbuf->n_channels = 3;

  pixbuf->bits_per_sample = 8;

  pixbuf->has_alpha = FALSE;

}

static void

gdk_pixbuf_class_init (GdkPixbufClass *klass)

{

        GObjectClass *object_class = G_OBJECT_CLASS (klass);

        _gdk_pixbuf_init_gettext ();

        object_class->finalize = gdk_pixbuf_finalize;

        object_class->set_property = gdk_pixbuf_set_property;

        object_class->get_property = gdk_pixbuf_get_property;

#define PIXBUF_PARAM_FLAGS G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY|\

                           G_PARAM_EXPLICIT_NOTIFY|\

                           G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB

        /**

         * GdkPixbuf:n-channels:

         *

         * The number of samples per pixel. 

         * Currently, only 3 or 4 samples per pixel are supported.

         */

        g_object_class_install_property (object_class,

                                         PROP_N_CHANNELS,

                                         g_param_spec_int ("n-channels",

                                                           _("Number of Channels"),

                                                           _("The number of samples per pixel"),

                                                           0,

                                                           G_MAXINT,

                                                           3,

                                                           PIXBUF_PARAM_FLAGS));

        g_object_class_install_property (object_class,

                                         PROP_COLORSPACE,

                                         g_param_spec_enum ("colorspace",

                                                            _("Colorspace"),

                                                            _("The colorspace in which the samples are interpreted"),

                                                            GDK_TYPE_COLORSPACE,

                                                            GDK_COLORSPACE_RGB,

                                                            PIXBUF_PARAM_FLAGS));

        g_object_class_install_property (object_class,

                                         PROP_HAS_ALPHA,

                                         g_param_spec_boolean ("has-alpha",

                                                               _("Has Alpha"),

                                                               _("Whether the pixbuf has an alpha channel"),

                                                               FALSE,

                                                               PIXBUF_PARAM_FLAGS));

        /**

         * GdkPixbuf:bits-per-sample:

         *

         * The number of bits per sample. 

         * Currently only 8 bit per sample are supported.

         */

        g_object_class_install_property (object_class,

                                         PROP_BITS_PER_SAMPLE,

                                         g_param_spec_int ("bits-per-sample",

                                                           _("Bits per Sample"),

                                                           _("The number of bits per sample"),

                                                           1,

                                                           16,

                                                           8,

                                                           PIXBUF_PARAM_FLAGS));

        g_object_class_install_property (object_class,

                                         PROP_WIDTH,

                                         g_param_spec_int ("width",

                                                           _("Width"),

                                                           _("The number of columns of the pixbuf"),

                                                           1,

                                                           G_MAXINT,

                                                           1,

                                                           PIXBUF_PARAM_FLAGS));

        g_object_class_install_property (object_class,

                                         PROP_HEIGHT,

                                         g_param_spec_int ("height",

                                                           _("Height"),

                                                           _("The number of rows of the pixbuf"),

                                                           1,

                                                           G_MAXINT,

                                                           1,

                                                           PIXBUF_PARAM_FLAGS));

        /**

         * GdkPixbuf:rowstride:

         *

         * The number of bytes between the start of a row and 

         * the start of the next row. This number must (obviously)

         * be at least as large as the width of the pixbuf.

         */

        g_object_class_install_property (object_class,

                                         PROP_ROWSTRIDE,

                                         g_param_spec_int ("rowstride",

                                                           _("Rowstride"),

                                                           _("The number of bytes between the start of a row and the start of the next row"),

                                                           1,

                                                           G_MAXINT,

                                                           1,

                                                           PIXBUF_PARAM_FLAGS));

        g_object_class_install_property (object_class,

                                         PROP_PIXELS,

                                         g_param_spec_pointer ("pixels",

                                                               _("Pixels"),

                                                               _("A pointer to the pixel data of the pixbuf"),

                                                               PIXBUF_PARAM_FLAGS));

        /**

         * GdkPixbuf::pixel-bytes:

         *

         * If set, this pixbuf was created from read-only #GBytes.

         * Replaces GdkPixbuf::pixels.

         * 

         * Since: 2.32

         */

        g_object_class_install_property (object_class,

                                         PROP_PIXEL_BYTES,

                                         g_param_spec_boxed ("pixel-bytes",

                                                             _("Pixel Bytes"),

                                                             _("Readonly pixel data"),

                                                             G_TYPE_BYTES,

                                                             PIXBUF_PARAM_FLAGS));

}

static void

gdk_pixbuf_finalize (GObject *object)

{

        GdkPixbuf *pixbuf = GDK_PIXBUF (object);

        if (pixbuf->pixels && pixbuf->destroy_fn)

                (* pixbuf->destroy_fn) (pixbuf->pixels, pixbuf->destroy_fn_data);

        g_clear_pointer (&pixbuf->bytes, g_bytes_unref);

        G_OBJECT_CLASS (gdk_pixbuf_parent_class)->finalize (object);

}

/**

 * gdk_pixbuf_ref: (skip)

 * @pixbuf: A pixbuf.

 *

 * Adds a reference to a pixbuf.

 *

 * Return value: The same as the @pixbuf argument.

 *

 * Deprecated: 2.0: Use g_object_ref().

 **/

GdkPixbuf *

gdk_pixbuf_ref (GdkPixbuf *pixbuf)

{

        return (GdkPixbuf *) g_object_ref (pixbuf);

}

/**

 * gdk_pixbuf_unref: (skip)

 * @pixbuf: A pixbuf.

 *

 * Removes a reference from a pixbuf.

 *

 * Deprecated: 2.0: Use g_object_unref().

 **/

void

gdk_pixbuf_unref (GdkPixbuf *pixbuf)

{

        g_object_unref (pixbuf);

}

static GBytes *

gdk_pixbuf_make_bytes (GdkPixbuf  *pixbuf,

                       GError    **error)

{

  gchar *buffer;

  gsize size;

  if (!gdk_pixbuf_save_to_buffer (pixbuf, &buffer, &size, "png", error, NULL))

    return NULL;

  return g_bytes_new_take (buffer, size);

}

static GVariant *

gdk_pixbuf_serialize (GIcon *icon)

{

  GError *error = NULL;

  GVariant *result;

  GBytes *bytes;

  bytes = gdk_pixbuf_make_bytes (GDK_PIXBUF (icon), &error);

  if (!bytes)

    {

      g_critical ("Unable to serialise GdkPixbuf to png (via g_icon_serialize()): %s", error->message);

      g_error_free (error);

      return NULL;

    }

  result = g_variant_new_from_bytes (G_VARIANT_TYPE_BYTESTRING, bytes, TRUE);

  g_bytes_unref (bytes);

  return g_variant_new ("(sv)", "bytes", result);

}

static GInputStream *

gdk_pixbuf_load (GLoadableIcon  *icon,

                 int             size,

                 char          **type,

                 GCancellable   *cancellable,

                 GError        **error)

{

  GInputStream *stream;

  GBytes *bytes;

  bytes = gdk_pixbuf_make_bytes (GDK_PIXBUF (icon), error);

  if (!bytes)

    return NULL;

  stream = g_memory_input_stream_new_from_bytes (bytes);

  g_bytes_unref (bytes);

  if (type)

    *type = g_strdup ("image/png");

  return stream;

}

static void

gdk_pixbuf_load_async (GLoadableIcon       *icon,

                       int                  size,

                       GCancellable        *cancellable,

                       GAsyncReadyCallback  callback,

                       gpointer             user_data)

{

  GTask *task;

  task = g_task_new (icon, cancellable, callback, user_data);

  g_task_return_pointer (task, icon, NULL);

  g_object_unref (task);

}

static GInputStream *

gdk_pixbuf_load_finish (GLoadableIcon  *icon,

                        GAsyncResult   *res,

                        char          **type,

                        GError        **error)

{

  g_return_val_if_fail (g_task_is_valid (res, icon), NULL);

  if (!g_task_propagate_pointer (G_TASK (res), error))

    return NULL;

  return gdk_pixbuf_load (icon, 0, type, NULL, error);

}

static void

gdk_pixbuf_loadable_icon_iface_init (GLoadableIconIface *iface)

{

  iface->load = gdk_pixbuf_load;

  /* In theory encoding a png could be time-consuming but we're talking

   * about icons here, so assume it's probably going to be OK and handle

   * the async variant of the call in-thread instead of having the

   * default implementation dispatch it to a worker.

   */

  iface->load_async = gdk_pixbuf_load_async;

  iface->load_finish = gdk_pixbuf_load_finish;

}

static void

gdk_pixbuf_icon_iface_init (GIconIface *iface)

{

        iface->hash = (guint (*) (GIcon *)) g_direct_hash;

        iface->equal = (gboolean (*) (GIcon *, GIcon *)) g_direct_equal;

        iface->serialize = gdk_pixbuf_serialize;

}

/* Used as the destroy notification function for gdk_pixbuf_new() */

static void

free_buffer (guchar *pixels, gpointer data)

{

	g_free (pixels);

}

/**

 * gdk_pixbuf_calculate_rowstride:

 * @colorspace: Color space for image

 * @has_alpha: Whether the image should have transparency information

 * @bits_per_sample: Number of bits per color sample

 * @width: Width of image in pixels, must be > 0

 * @height: Height of image in pixels, must be > 0

 *

 * Calculates the rowstride that an image created with those values would

 * have. This is useful for front-ends and backends that want to sanity

 * check image values without needing to create them.

 *

 * Return value: the rowstride for the given values, or -1 in case of error.

 *

 * Since: 2.36.8

 */

gint

gdk_pixbuf_calculate_rowstride (GdkColorspace colorspace,

				gboolean      has_alpha,

				int           bits_per_sample,

				int           width,

				int           height)

{

	unsigned int channels;

	g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, -1);

	g_return_val_if_fail (bits_per_sample == 8, -1);

	g_return_val_if_fail (width > 0, -1);

	g_return_val_if_fail (height > 0, -1);

	channels = has_alpha ? 4 : 3;

	/* Overflow? */

	if (width > (G_MAXINT - 3) / channels)

		return -1;

	/* Always align rows to 32-bit boundaries */

	return (width * channels + 3) & ~3;

}

/**

 * gdk_pixbuf_new:

 * @colorspace: Color space for image

 * @has_alpha: Whether the image should have transparency information

 * @bits_per_sample: Number of bits per color sample

 * @width: Width of image in pixels, must be > 0

 * @height: Height of image in pixels, must be > 0

 *

 * Creates a new #GdkPixbuf structure and allocates a buffer for it.  The 

 * buffer has an optimal rowstride.  Note that the buffer is not cleared;

 * you will have to fill it completely yourself.

 *

 * Return value: A newly-created #GdkPixbuf with a reference count of 1, or 

 * %NULL if not enough memory could be allocated for the image buffer.

 **/

GdkPixbuf *

gdk_pixbuf_new (GdkColorspace colorspace, 

                gboolean      has_alpha,

                int           bits_per_sample,

                int           width,

                int           height)

{

	guchar *buf;

	int rowstride;

	rowstride = gdk_pixbuf_calculate_rowstride (colorspace,

						    has_alpha,

						    bits_per_sample,

						    width,

						    height);

	if (rowstride <= 0)

		return NULL;

	buf = g_try_malloc_n (height, rowstride);

	if (!buf)

		return NULL;

	return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,

					 width, height, rowstride,

					 free_buffer, NULL);

}

/**

 * gdk_pixbuf_copy:

 * @pixbuf: A pixbuf.

 * 

 * Creates a new #GdkPixbuf with a copy of the information in the specified

 * @pixbuf. Note that this does not copy the options set on the original #GdkPixbuf,

 * use gdk_pixbuf_copy_options() for this.

 * 

 * Return value: (transfer full): A newly-created pixbuf with a reference count of 1, or %NULL if

 * not enough memory could be allocated.

 **/

GdkPixbuf *

gdk_pixbuf_copy (const GdkPixbuf *pixbuf)

{

	guchar *buf;

	int size;

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);

	/* Calculate a semi-exact size.  Here we copy with full rowstrides;

	 * maybe we should copy each row individually with the minimum

	 * rowstride?

	 */

	size = gdk_pixbuf_get_byte_length (pixbuf);

	buf = g_try_malloc (size);

	if (!buf)

		return NULL;

	memcpy (buf, gdk_pixbuf_read_pixels (pixbuf), size);

	return gdk_pixbuf_new_from_data (buf,

					 pixbuf->colorspace, pixbuf->has_alpha,

					 pixbuf->bits_per_sample,

					 pixbuf->width, pixbuf->height,

					 pixbuf->rowstride,

					 free_buffer,

					 NULL);

}

/**

 * gdk_pixbuf_new_subpixbuf:

 * @src_pixbuf: a #GdkPixbuf

 * @src_x: X coord in @src_pixbuf

 * @src_y: Y coord in @src_pixbuf

 * @width: width of region in @src_pixbuf

 * @height: height of region in @src_pixbuf

 * 

 * Creates a new pixbuf which represents a sub-region of @src_pixbuf.

 * The new pixbuf shares its pixels with the original pixbuf, so

 * writing to one affects both.  The new pixbuf holds a reference to

 * @src_pixbuf, so @src_pixbuf will not be finalized until the new

 * pixbuf is finalized.

 *

 * Note that if @src_pixbuf is read-only, this function will force it

 * to be mutable.

 *

 * Return value: (transfer full): a new pixbuf 

 **/

GdkPixbuf*

gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,

                          int        src_x,

                          int        src_y,

                          int        width,

                          int        height)

{

        guchar *pixels;

        GdkPixbuf *sub;

        g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), NULL);

        g_return_val_if_fail (src_x >= 0 && src_x + width <= src_pixbuf->width, NULL);

        g_return_val_if_fail (src_y >= 0 && src_y + height <= src_pixbuf->height, NULL);

        /* Note causes an implicit copy where src_pixbuf owns the data */

        pixels = (gdk_pixbuf_get_pixels (src_pixbuf)

                  + src_y * src_pixbuf->rowstride

                  + src_x * src_pixbuf->n_channels);

        sub = gdk_pixbuf_new_from_data (pixels,

                                        src_pixbuf->colorspace,

                                        src_pixbuf->has_alpha,

                                        src_pixbuf->bits_per_sample,

                                        width, height,

                                        src_pixbuf->rowstride,

                                        NULL, NULL);

        /* Keep a reference to src_pixbuf */

        g_object_ref (src_pixbuf);

        g_object_set_qdata_full (G_OBJECT (sub),

                                 g_quark_from_static_string ("gdk-pixbuf-subpixbuf-src"),

                                 src_pixbuf,

                                 (GDestroyNotify) g_object_unref);

        return sub;

}

/* Accessors */

/**

 * gdk_pixbuf_get_colorspace:

 * @pixbuf: A pixbuf.

 *

 * Queries the color space of a pixbuf.

 *

 * Return value: Color space.

 **/

GdkColorspace

gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), GDK_COLORSPACE_RGB);

	return pixbuf->colorspace;

}

/**

 * gdk_pixbuf_get_n_channels:

 * @pixbuf: A pixbuf.

 *

 * Queries the number of channels of a pixbuf.

 *

 * Return value: Number of channels.

 **/

int

gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1);

	return pixbuf->n_channels;

}

/**

 * gdk_pixbuf_get_has_alpha:

 * @pixbuf: A pixbuf.

 *

 * Queries whether a pixbuf has an alpha channel (opacity information).

 *

 * Return value: %TRUE if it has an alpha channel, %FALSE otherwise.

 **/

gboolean

gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), FALSE);

	return pixbuf->has_alpha ? TRUE : FALSE;

}

/**

 * gdk_pixbuf_get_bits_per_sample:

 * @pixbuf: A pixbuf.

 *

 * Queries the number of bits per color sample in a pixbuf.

 *

 * Return value: Number of bits per color sample.

 **/

int

gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1);

	return pixbuf->bits_per_sample;

}

/**

 * gdk_pixbuf_get_pixels:

 * @pixbuf: A pixbuf.

 *

 * Queries a pointer to the pixel data of a pixbuf.

 *

 * Return value: (array): A pointer to the pixbuf's pixel data.

 * Please see the section on [image data](image-data) for information

 * about how the pixel data is stored in memory.

 *

 * This function will cause an implicit copy of the pixbuf data if the

 * pixbuf was created from read-only data.

 **/

guchar *

gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf)

{

        return gdk_pixbuf_get_pixels_with_length (pixbuf, NULL);

}

/**

 * gdk_pixbuf_get_pixels_with_length: (rename-to gdk_pixbuf_get_pixels)

 * @pixbuf: A pixbuf.

 * @length: (out): The length of the binary data.

 *

 * Queries a pointer to the pixel data of a pixbuf.

 *

 * Return value: (array length=length): A pointer to the pixbuf's

 * pixel data.  Please see the section on [image data](image-data)

 * for information about how the pixel data is stored in memory.

 *

 * This function will cause an implicit copy of the pixbuf data if the

 * pixbuf was created from read-only data.

 *

 * Since: 2.26

 */

guchar *

gdk_pixbuf_get_pixels_with_length (const GdkPixbuf *pixbuf,

                                   guint           *length)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);

        if (pixbuf->bytes) {

                GdkPixbuf *mut_pixbuf = (GdkPixbuf*)pixbuf;

                gsize len;

                mut_pixbuf->pixels = g_bytes_unref_to_data (pixbuf->bytes, &len;;

                mut_pixbuf->bytes = NULL;

        }

        if (length)

                *length = gdk_pixbuf_get_byte_length (pixbuf);

	return pixbuf->pixels;

}

/**

 * gdk_pixbuf_read_pixels:

 * @pixbuf: A pixbuf

 *

 * Returns a read-only pointer to the raw pixel data; must not be

 * modified.  This function allows skipping the implicit copy that

 * must be made if gdk_pixbuf_get_pixels() is called on a read-only

 * pixbuf.

 *

 * Since: 2.32

 */

const guint8*

gdk_pixbuf_read_pixels (const GdkPixbuf  *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);

        if (pixbuf->bytes) {

                gsize len;

                /* Ignore len; callers know the size via other variables */

                return g_bytes_get_data (pixbuf->bytes, &len;;

        } else {

                return pixbuf->pixels;

        }

}

/**

 * gdk_pixbuf_read_pixel_bytes:

 * @pixbuf: A pixbuf

 *

 * Returns: (transfer full): A new reference to a read-only copy of

 * the pixel data.  Note that for mutable pixbufs, this function will

 * incur a one-time copy of the pixel data for conversion into the

 * returned #GBytes.

 *

 * Since: 2.32

 */

GBytes *

gdk_pixbuf_read_pixel_bytes (const GdkPixbuf  *pixbuf)

{

        g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);

        if (pixbuf->bytes) {

                return g_bytes_ref (pixbuf->bytes);

        } else {

                return g_bytes_new (pixbuf->pixels,

                                    gdk_pixbuf_get_byte_length (pixbuf));

        }

}

/**

 * gdk_pixbuf_get_width:

 * @pixbuf: A pixbuf.

 *

 * Queries the width of a pixbuf.

 *

 * Return value: Width in pixels.

 **/

int

gdk_pixbuf_get_width (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1);

	return pixbuf->width;

}

/**

 * gdk_pixbuf_get_height:

 * @pixbuf: A pixbuf.

 *

 * Queries the height of a pixbuf.

 *

 * Return value: Height in pixels.

 **/

int

gdk_pixbuf_get_height (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1);

	return pixbuf->height;

}

/**

 * gdk_pixbuf_get_rowstride:

 * @pixbuf: A pixbuf.

 *

 * Queries the rowstride of a pixbuf, which is the number of bytes between

 * the start of a row and the start of the next row.

 *

 * Return value: Distance between row starts.

 **/

int

gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1);

	return pixbuf->rowstride;

}

/**

 * gdk_pixbuf_get_byte_length:

 * @pixbuf: A pixbuf

 *

 * Returns the length of the pixel data, in bytes.

 *

 * Return value: The length of the pixel data.

 *

 * Since: 2.26

 */

gsize

gdk_pixbuf_get_byte_length (const GdkPixbuf *pixbuf)

{

	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1);

        return ((pixbuf->height - 1) * pixbuf->rowstride +

                pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8));

}

/* General initialization hooks */

const guint gdk_pixbuf_major_version = GDK_PIXBUF_MAJOR;

const guint gdk_pixbuf_minor_version = GDK_PIXBUF_MINOR;

const guint gdk_pixbuf_micro_version = GDK_PIXBUF_MICRO;

const char *gdk_pixbuf_version = GDK_PIXBUF_VERSION;

/* Error quark */

GQuark

gdk_pixbuf_error_quark (void)

{

  return g_quark_from_static_string ("gdk-pixbuf-error-quark");

}

/**

 * gdk_pixbuf_fill:

 * @pixbuf: a #GdkPixbuf

 * @pixel: RGBA pixel to clear to

 *         (0xffffffff is opaque white, 0x00000000 transparent black)

 *

 * Clears a pixbuf to the given RGBA value, converting the RGBA value into

 * the pixbuf's pixel format. The alpha will be ignored if the pixbuf

 * doesn't have an alpha channel.

 * 

 **/

void

gdk_pixbuf_fill (GdkPixbuf *pixbuf,

                 guint32    pixel)

{

        guchar *pixels;

        guint r, g, b, a;

        guchar *p;

        guint w, h;

        g_return_if_fail (GDK_IS_PIXBUF (pixbuf));

        g_return_if_fail (pixbuf->pixels || pixbuf->bytes);