Pileus Git - ~andy/gtk/blob - gdk-pixbuf/gdk-pixbuf-core.h

   1 /* GdkPixbuf library - GdkPixbuf data structure
   2  *
   3  * Copyright (C) 2003 The Free Software Foundation
   4  *
   5  * Authors: Mark Crichton <crichton@gimp.org>
   6  *          Miguel de Icaza <miguel@gnu.org>
   7  *          Federico Mena-Quintero <federico@gimp.org>
   8  *          Havoc Pennington <hp@redhat.com>
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 02111-1307, USA.
  24  */
  25
  26 #if !defined (GDK_PIXBUF_H_INSIDE) && !defined (GDK_PIXBUF_COMPILATION)
  27 #error "Only <gdk-pixbuf/gdk-pixbuf.h> can be included directly."
  28 #endif
  29
  30 #ifndef GDK_PIXBUF_CORE_H
  31 #define GDK_PIXBUF_CORE_H
  32
  33 #include <glib.h>
  34 #include <glib-object.h>
  35 #include <gio/gio.h>
  36
  37 G_BEGIN_DECLS
  38
  39 /* Alpha compositing mode */
  40 typedef enum
  41 {
  42         GDK_PIXBUF_ALPHA_BILEVEL,
  43         GDK_PIXBUF_ALPHA_FULL
  44 } GdkPixbufAlphaMode;
  45
  46 /* Color spaces; right now only RGB is supported.
  47  * Note that these values are encoded in inline pixbufs
  48  * as ints, so don't reorder them
  49  */
  50 typedef enum {
  51         GDK_COLORSPACE_RGB
  52 } GdkColorspace;
  53
  54 /* All of these are opaque structures */
  55 typedef struct _GdkPixbuf GdkPixbuf;
  56
  57 #define GDK_TYPE_PIXBUF              (gdk_pixbuf_get_type ())
  58 #define GDK_PIXBUF(object)           (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_PIXBUF, GdkPixbuf))
  59 #define GDK_IS_PIXBUF(object)        (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_PIXBUF))
  60
  61
  62 /* Handler that must free the pixel array */
  63 typedef void (* GdkPixbufDestroyNotify) (guchar *pixels, gpointer data);
  64
  65 #define GDK_PIXBUF_ERROR gdk_pixbuf_error_quark ()
  66
  67 typedef enum {
  68         /* image data hosed */
  69         GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
  70         /* no mem to load image */
  71         GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
  72         /* bad option passed to save routine */
  73         GDK_PIXBUF_ERROR_BAD_OPTION,
  74         /* unsupported image type (sort of an ENOSYS) */
  75         GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
  76         /* unsupported operation (load, save) for image type */
  77         GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION,
  78         GDK_PIXBUF_ERROR_FAILED
  79 } GdkPixbufError;
  80
  81 GQuark gdk_pixbuf_error_quark (void);
  82
  83 \f
  84
  85 GType gdk_pixbuf_get_type (void) G_GNUC_CONST;
  86
  87 /* GdkPixbuf accessors */
  88
  89 GdkColorspace gdk_pixbuf_get_colorspace      (const GdkPixbuf *pixbuf);
  90 int           gdk_pixbuf_get_n_channels      (const GdkPixbuf *pixbuf);
  91 gboolean      gdk_pixbuf_get_has_alpha       (const GdkPixbuf *pixbuf);
  92 int           gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf);
  93 guchar       *gdk_pixbuf_get_pixels          (const GdkPixbuf *pixbuf);
  94 int           gdk_pixbuf_get_width           (const GdkPixbuf *pixbuf);
  95 int           gdk_pixbuf_get_height          (const GdkPixbuf *pixbuf);
  96 int           gdk_pixbuf_get_rowstride       (const GdkPixbuf *pixbuf);
  97
  98 \f
  99
 100 /* Create a blank pixbuf with an optimal rowstride and a new buffer */
 101 GdkPixbuf *gdk_pixbuf_new (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample,
 102                            int width, int height);
 103
 104 /* Copy a pixbuf */
 105
 106 GdkPixbuf *gdk_pixbuf_copy (const GdkPixbuf *pixbuf);
 107
 108 /* Create a pixbuf which points to the pixels of another pixbuf */
 109 GdkPixbuf *gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,
 110                                      int        src_x,
 111                                      int        src_y,
 112                                      int        width,
 113                                      int        height);
 114
 115 /* Simple loading */
 116
 117 #ifdef G_OS_WIN32
 118 /* DLL ABI stability hack. */
 119 #define gdk_pixbuf_new_from_file gdk_pixbuf_new_from_file_utf8
 120 #define gdk_pixbuf_new_from_file_at_size gdk_pixbuf_new_from_file_at_size_utf8
 121 #define gdk_pixbuf_new_from_file_at_scale gdk_pixbuf_new_from_file_at_scale_utf8
 122 #endif
 123
 124 GdkPixbuf *gdk_pixbuf_new_from_file (const char *filename,
 125                                      GError    **error);
 126 GdkPixbuf *gdk_pixbuf_new_from_file_at_size (const char *filename,
 127                                              int         width,
 128                                              int         height,
 129                                              GError    **error);
 130 GdkPixbuf *gdk_pixbuf_new_from_file_at_scale (const char *filename,
 131                                               int         width,
 132                                               int         height,
 133                                               gboolean    preserve_aspect_ratio,
 134                                               GError    **error);
 135
 136 GdkPixbuf *gdk_pixbuf_new_from_data (const guchar *data,
 137                                      GdkColorspace colorspace,
 138                                      gboolean has_alpha,
 139                                      int bits_per_sample,
 140                                      int width, int height,
 141                                      int rowstride,
 142                                      GdkPixbufDestroyNotify destroy_fn,
 143                                      gpointer destroy_fn_data);
 144
 145 GdkPixbuf *gdk_pixbuf_new_from_xpm_data (const char **data);
 146 GdkPixbuf* gdk_pixbuf_new_from_inline   (gint          data_length,
 147                                          const guint8 *data,
 148                                          gboolean      copy_pixels,
 149                                          GError      **error);
 150
 151 /* Mutations */
 152 void       gdk_pixbuf_fill              (GdkPixbuf    *pixbuf,
 153                                          guint32       pixel);
 154
 155 /* Saving */
 156
 157 #ifdef G_OS_WIN32
 158 /* DLL ABI stability hack. */
 159 #define gdk_pixbuf_save gdk_pixbuf_save_utf8
 160 #define gdk_pixbuf_savev gdk_pixbuf_savev_utf8
 161 #endif
 162
 163 gboolean gdk_pixbuf_save           (GdkPixbuf  *pixbuf,
 164                                     const char *filename,
 165                                     const char *type,
 166                                     GError    **error,
 167                                     ...) G_GNUC_NULL_TERMINATED;
 168
 169 gboolean gdk_pixbuf_savev          (GdkPixbuf  *pixbuf,
 170                                     const char *filename,
 171                                     const char *type,
 172                                     char      **option_keys,
 173                                     char      **option_values,
 174                                     GError    **error);
 175
 176 /* Saving to a callback function */
 177
 178 typedef gboolean (*GdkPixbufSaveFunc)   (const gchar *buf,
 179                                          gsize count,
 180                                          GError **error,
 181                                          gpointer data);
 182
 183 gboolean gdk_pixbuf_save_to_callback    (GdkPixbuf  *pixbuf,
 184                                          GdkPixbufSaveFunc save_func,
 185                                          gpointer user_data,
 186                                          const char *type,
 187                                          GError    **error,
 188                                          ...) G_GNUC_NULL_TERMINATED;
 189
 190 gboolean gdk_pixbuf_save_to_callbackv   (GdkPixbuf  *pixbuf,
 191                                          GdkPixbufSaveFunc save_func,
 192                                          gpointer user_data,
 193                                          const char *type,
 194                                          char      **option_keys,
 195                                          char      **option_values,
 196                                          GError    **error);
 197
 198 /* Saving into a newly allocated char array */
 199
 200 gboolean gdk_pixbuf_save_to_buffer      (GdkPixbuf  *pixbuf,
 201                                          gchar     **buffer,
 202                                          gsize      *buffer_size,
 203                                          const char *type,
 204                                          GError    **error,
 205                                          ...) G_GNUC_NULL_TERMINATED;
 206
 207 gboolean gdk_pixbuf_save_to_bufferv     (GdkPixbuf  *pixbuf,
 208                                          gchar     **buffer,
 209                                          gsize      *buffer_size,
 210                                          const char *type,
 211                                          char      **option_keys,
 212                                          char      **option_values,
 213                                          GError    **error);
 214
 215 GdkPixbuf *gdk_pixbuf_new_from_stream   (GInputStream   *stream,
 216                                          GCancellable   *cancellable,
 217                                          GError        **error);
 218
 219 GdkPixbuf *gdk_pixbuf_new_from_stream_at_scale   (GInputStream   *stream,
 220                                                   gint            width,
 221                                                   gint            height,
 222                                                   gboolean        preserve_aspect_ratio,
 223                                                   GCancellable   *cancellable,
 224                                                   GError        **error);
 225
 226 gboolean   gdk_pixbuf_save_to_stream    (GdkPixbuf      *pixbuf,
 227                                          GOutputStream  *stream,
 228                                          const char     *type,
 229                                          GCancellable   *cancellable,
 230                                          GError        **error,
 231                                          ...);
 232
 233 /* Adding an alpha channel */
 234 GdkPixbuf *gdk_pixbuf_add_alpha (const GdkPixbuf *pixbuf, gboolean substitute_color,
 235                                  guchar r, guchar g, guchar b);
 236
 237 /* Copy an area of a pixbuf onto another one */
 238 void gdk_pixbuf_copy_area (const GdkPixbuf *src_pixbuf,
 239                            int src_x, int src_y,
 240                            int width, int height,
 241                            GdkPixbuf *dest_pixbuf,
 242                            int dest_x, int dest_y);
 243
 244 /* Brighten/darken and optionally make it pixelated-looking */
 245 void gdk_pixbuf_saturate_and_pixelate (const GdkPixbuf *src,
 246                                        GdkPixbuf       *dest,
 247                                        gfloat           saturation,
 248                                        gboolean         pixelate);
 249
 250 /* Transform an image to agree with its embedded orientation option / tag */
 251 GdkPixbuf *gdk_pixbuf_apply_embedded_orientation (GdkPixbuf *src);
 252
 253 G_CONST_RETURN gchar * gdk_pixbuf_get_option (GdkPixbuf   *pixbuf,
 254                                               const gchar *key);
 255
 256
 257 G_END_DECLS
 258
 259
 260 #endif /* GDK_PIXBUF_CORE_H */