mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-09-20 14:00:10 +00:00
5d15f30279
2003-06-01 Matthias Clasen <maclas@gmx.de> * gdk-pixdata.h (struct _GdkPixdata): Fix misleading documentation of rowstride. (#113924, Noah Levitt)
171 lines
6.4 KiB
C
171 lines
6.4 KiB
C
/* 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.
|
|
*/
|
|
#ifndef __GDK_PIXDATA_H__
|
|
#define __GDK_PIXDATA_H__
|
|
|
|
#include <gdk-pixbuf/gdk-pixbuf.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
/**
|
|
* GDK_PIXBUF_MAGIC_NUMBER:
|
|
*
|
|
* Magic number for #GdkPixdata structures.
|
|
**/
|
|
#define GDK_PIXBUF_MAGIC_NUMBER (0x47646b50) /* 'GdkP' */
|
|
|
|
/**
|
|
* GdkPixdataType:
|
|
* @GDK_PIXDATA_COLOR_TYPE_RGB: each pixel has red, green and blue samples.
|
|
* @GDK_PIXDATA_COLOR_TYPE_RGBA: each pixel has red, green and blue samples
|
|
* and an alpha value.
|
|
* @GDK_PIXDATA_COLOR_TYPE_MASK: mask for the colortype flags of the enum.
|
|
* @GDK_PIXDATA_SAMPLE_WIDTH_8: each sample has 8 bits.
|
|
* @GDK_PIXDATA_SAMPLE_WIDTH_MASK: mask for the sample width flags of the enum.
|
|
* @GDK_PIXDATA_ENCODING_RAW: the pixel data is in raw form.
|
|
* @GDK_PIXDATA_ENCODING_RLE: the pixel data is run-length encoded. Runs may
|
|
* be up to 127 bytes long; their length is stored in a single byte
|
|
* preceding the pixel data for the run. If a run is constant, its length
|
|
* byte has the high bit set and the pixel data consists of a single pixel
|
|
* which must be repeated.
|
|
* @GDK_PIXDATA_ENCODING_MASK: mask for the encoding flags of the enum.
|
|
*
|
|
* An enumeration containing three sets of flags for a #GdkPixdata struct:
|
|
* one for the used colorspace, one for the width of the samples and one
|
|
* for the encoding of the pixel data.
|
|
**/
|
|
typedef enum
|
|
{
|
|
/* colorspace + alpha */
|
|
GDK_PIXDATA_COLOR_TYPE_RGB = 0x01,
|
|
GDK_PIXDATA_COLOR_TYPE_RGBA = 0x02,
|
|
GDK_PIXDATA_COLOR_TYPE_MASK = 0xff,
|
|
/* width, support 8bits only currently */
|
|
GDK_PIXDATA_SAMPLE_WIDTH_8 = 0x01 << 16,
|
|
GDK_PIXDATA_SAMPLE_WIDTH_MASK = 0x0f << 16,
|
|
/* encoding */
|
|
GDK_PIXDATA_ENCODING_RAW = 0x01 << 24,
|
|
GDK_PIXDATA_ENCODING_RLE = 0x02 << 24,
|
|
GDK_PIXDATA_ENCODING_MASK = 0x0f << 24
|
|
} GdkPixdataType;
|
|
|
|
/**
|
|
* GdkPixdata:
|
|
* @magic: magic number. A valid #GdkPixdata structure must have
|
|
* #GDK_PIXBUF_MAGIC_NUMBER here.
|
|
* @length: less than 1 to disable length checks, otherwise
|
|
* #GDK_PIXDATA_HEADER_LENGTH + length of @pixel_data.
|
|
* @pixdata_type: information about colorspace, sample width and
|
|
* encoding, in a #GdkPixdataType.
|
|
* @rowstride: Distance in bytes between rows.
|
|
* @width: Width of the image in pixels.
|
|
* @height: Height of the image in pixels.
|
|
* @pixel_data: @width x @height pixels, encoded according to @pixdata_type
|
|
* and @rowstride.
|
|
*
|
|
* A #GdkPixdata contains pixbuf information in a form suitable for
|
|
* serialization and streaming.
|
|
**/
|
|
typedef struct _GdkPixdata GdkPixdata;
|
|
struct _GdkPixdata
|
|
{
|
|
guint32 magic; /* GDK_PIXBUF_MAGIC_NUMBER */
|
|
gint32 length; /* <1 to disable length checks, otherwise:
|
|
* GDK_PIXDATA_HEADER_LENGTH + pixel_data length
|
|
*/
|
|
guint32 pixdata_type; /* GdkPixdataType */
|
|
guint32 rowstride;
|
|
guint32 width;
|
|
guint32 height;
|
|
guint8 *pixel_data;
|
|
};
|
|
|
|
/**
|
|
* GDK_PIXDATA_HEADER_LENGTH:
|
|
*
|
|
* The length of a #GdkPixdata structure without the @pixel_data pointer.
|
|
**/
|
|
#define GDK_PIXDATA_HEADER_LENGTH (4 + 4 + 4 + 4 + 4 + 4)
|
|
|
|
/* the returned stream is plain htonl of GdkPixdata members + pixel_data */
|
|
guint8* gdk_pixdata_serialize (const GdkPixdata *pixdata,
|
|
guint *stream_length_p);
|
|
gboolean gdk_pixdata_deserialize (GdkPixdata *pixdata,
|
|
guint stream_length,
|
|
const guint8 *stream,
|
|
GError **error);
|
|
gpointer gdk_pixdata_from_pixbuf (GdkPixdata *pixdata,
|
|
const GdkPixbuf *pixbuf,
|
|
gboolean use_rle);
|
|
GdkPixbuf* gdk_pixbuf_from_pixdata (const GdkPixdata *pixdata,
|
|
gboolean copy_pixels,
|
|
GError **error);
|
|
/**
|
|
* GdkPixdataDumpType:
|
|
* @GDK_PIXDATA_DUMP_PIXDATA_STREAM: Generate pixbuf data stream (a single
|
|
* string containing a serialized #GdkPixdata structure in network byte
|
|
* order).
|
|
* @GDK_PIXDATA_DUMP_PIXDATA_STRUCT: Generate #GdkPixdata structure (needs
|
|
* the #GdkPixdata structure definition from gdk-pixdata.h).
|
|
* @GDK_PIXDATA_DUMP_MACROS: Generate <function>*_ROWSTRIDE</function>,
|
|
* <function>*_WIDTH</function>, <function>*_HEIGHT</function>,
|
|
* <function>*_BYTES_PER_PIXEL</function> and
|
|
* <function>*_RLE_PIXEL_DATA</function> or <function>*_PIXEL_DATA</function>
|
|
* macro definitions for the image.
|
|
* @GDK_PIXDATA_DUMP_GTYPES: Generate GLib data types instead of
|
|
* standard C data types.
|
|
* @GDK_PIXDATA_DUMP_CTYPES: Generate standard C data types instead of
|
|
* GLib data types.
|
|
* @GDK_PIXDATA_DUMP_STATIC: Generate static symbols.
|
|
* @GDK_PIXDATA_DUMP_CONST: Generate const symbols.
|
|
* @GDK_PIXDATA_DUMP_RLE_DECODER: Provide a <function>*_RUN_LENGTH_DECODE(image_buf, rle_data, size, bpp)</function>
|
|
* macro definition to decode run-length encoded image data.
|
|
*
|
|
* An enumeration which is used by gdk_pixdata_to_csource() to
|
|
* determine the form of C source to be generated. The three values
|
|
* @GDK_PIXDATA_DUMP_PIXDATA_STREAM, @GDK_PIXDATA_DUMP_PIXDATA_STRUCT
|
|
* and @GDK_PIXDATA_DUMP_MACROS are mutually exclusive, as are
|
|
* @GDK_PIXBUF_DUMP_GTYPES and @GDK_PIXBUF_DUMP_CTYPES. The remaining
|
|
* elements are optional flags that can be freely added.
|
|
**/
|
|
typedef enum
|
|
{
|
|
/* type of source to save */
|
|
GDK_PIXDATA_DUMP_PIXDATA_STREAM = 0,
|
|
GDK_PIXDATA_DUMP_PIXDATA_STRUCT = 1,
|
|
GDK_PIXDATA_DUMP_MACROS = 2,
|
|
/* type of variables to use */
|
|
GDK_PIXDATA_DUMP_GTYPES = 0,
|
|
GDK_PIXDATA_DUMP_CTYPES = 1 << 8,
|
|
GDK_PIXDATA_DUMP_STATIC = 1 << 9,
|
|
GDK_PIXDATA_DUMP_CONST = 1 << 10,
|
|
/* save RLE decoder macro? */
|
|
GDK_PIXDATA_DUMP_RLE_DECODER = 1 << 16
|
|
} GdkPixdataDumpType;
|
|
|
|
|
|
GString* gdk_pixdata_to_csource (GdkPixdata *pixdata,
|
|
const gchar *name,
|
|
GdkPixdataDumpType dump_type);
|
|
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GDK_PIXDATA_H__ */
|