1 /* GdkPixbuf library - Basic memory management
3 * Copyright (C) 1999 The Free Software Foundation
5 * Authors: Mark Crichton <crichton@gimp.org>
6 * Miguel de Icaza <miguel@gnu.org>
7 * Federico Mena-Quintero <federico@gimp.org>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 * Boston, MA 02111-1307, USA.
29 #include "gdk-pixbuf.h"
30 #include "gdk-pixbuf-private.h"
32 static void gdk_pixbuf_class_init (GdkPixbufClass *klass);
33 static void gdk_pixbuf_finalize (GObject *object);
37 static gpointer parent_class;
40 gdk_pixbuf_get_type (void)
42 static GType object_type = 0;
45 static const GTypeInfo object_info = {
46 sizeof (GdkPixbufClass),
48 (GBaseFinalizeFunc) NULL,
49 (GClassInitFunc) gdk_pixbuf_class_init,
50 NULL, /* class_finalize */
51 NULL, /* class_data */
54 (GInstanceInitFunc) NULL,
57 object_type = g_type_register_static (G_TYPE_OBJECT,
66 gdk_pixbuf_class_init (GdkPixbufClass *klass)
68 GObjectClass *object_class = G_OBJECT_CLASS (klass);
70 parent_class = g_type_class_peek_parent (klass);
72 object_class->finalize = gdk_pixbuf_finalize;
76 gdk_pixbuf_finalize (GObject *object)
78 GdkPixbuf *pixbuf = GDK_PIXBUF (object);
80 if (pixbuf->destroy_fn)
81 (* pixbuf->destroy_fn) (pixbuf->pixels, pixbuf->destroy_fn_data);
83 G_OBJECT_CLASS (parent_class)->finalize (object);
90 * Adds a reference to a pixbuf. Deprecated; use g_object_ref().
92 * Return value: The same as the @pixbuf argument.
95 gdk_pixbuf_ref (GdkPixbuf *pixbuf)
97 return (GdkPixbuf *) g_object_ref (G_OBJECT(pixbuf));
104 * Removes a reference from a pixbuf. Deprecated; use
109 gdk_pixbuf_unref (GdkPixbuf *pixbuf)
111 g_object_unref (G_OBJECT (pixbuf));
116 /* Used as the destroy notification function for gdk_pixbuf_new() */
118 free_buffer (guchar *pixels, gpointer data)
125 * @colorspace: Color space for image.
126 * @has_alpha: Whether the image should have transparency information.
127 * @bits_per_sample: Number of bits per color sample.
128 * @width: Width of image in pixels.
129 * @height: Height of image in pixels.
131 * Creates a new #GdkPixbuf structure and allocates a buffer for it. The buffer
132 * has an optimal rowstride. Note that the buffer is not cleared; you will have
133 * to fill it completely yourself.
135 * Return value: A newly-created #GdkPixbuf with a reference count of 1, or NULL
136 * if not enough memory could be allocated for the image buffer.
139 gdk_pixbuf_new (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample,
140 int width, int height)
146 g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, NULL);
147 g_return_val_if_fail (bits_per_sample == 8, NULL);
148 g_return_val_if_fail (width > 0, NULL);
149 g_return_val_if_fail (height > 0, NULL);
151 /* Always align rows to 32-bit boundaries */
153 channels = has_alpha ? 4 : 3;
154 rowstride = 4 * ((channels * width + 3) / 4);
156 buf = malloc (height * rowstride);
160 return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,
161 width, height, rowstride,
169 * Creates a new #GdkPixbuf with a copy of the information in the specified
172 * Return value: A newly-created pixbuf with a reference count of 1, or NULL if
173 * not enough memory could be allocated.
176 gdk_pixbuf_copy (const GdkPixbuf *pixbuf)
181 g_return_val_if_fail (pixbuf != NULL, NULL);
183 /* Calculate a semi-exact size. Here we copy with full rowstrides;
184 * maybe we should copy each row individually with the minimum
188 size = ((pixbuf->height - 1) * pixbuf->rowstride +
189 pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8));
191 buf = malloc (size * sizeof (guchar));
195 memcpy (buf, pixbuf->pixels, size);
197 return gdk_pixbuf_new_from_data (buf,
198 pixbuf->colorspace, pixbuf->has_alpha,
199 pixbuf->bits_per_sample,
200 pixbuf->width, pixbuf->height,
207 * gdk_pixbuf_new_subpixbuf:
208 * @src_pixbuf: a #GdkPixbuf
209 * @src_x: X coord in @src_pixbuf
210 * @src_y: Y coord in @src_pixbuf
211 * @width: width of region in @src_pixbuf
212 * @height: height of region in @src_pixbuf
214 * Creates a new pixbuf which represents a sub-region of
215 * @src_pixbuf. The new pixbuf shares its pixels with the
216 * original pixbuf, so writing to one affects both.
217 * The new pixbuf holds a reference to @src_pixbuf, so
218 * @src_pixbuf will not be finalized until the new pixbuf
221 * Return value: a new pixbuf
224 gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,
233 g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), NULL);
234 g_return_val_if_fail (src_x >= 0 && src_x + width <= src_pixbuf->width, NULL);
235 g_return_val_if_fail (src_y >= 0 && src_y + height <= src_pixbuf->height, NULL);
237 pixels = (gdk_pixbuf_get_pixels (src_pixbuf)
238 + src_y * src_pixbuf->rowstride
239 + src_x * src_pixbuf->n_channels);
241 sub = gdk_pixbuf_new_from_data (pixels,
242 src_pixbuf->colorspace,
243 src_pixbuf->has_alpha,
244 src_pixbuf->bits_per_sample,
246 src_pixbuf->rowstride,
249 /* Keep a reference to src_pixbuf */
250 g_object_ref (G_OBJECT (src_pixbuf));
252 g_object_set_qdata_full (G_OBJECT (sub),
253 g_quark_from_static_string ("gdk-pixbuf-subpixbuf-src"),
255 (GDestroyNotify) g_object_unref);
265 * gdk_pixbuf_get_colorspace:
268 * Queries the color space of a pixbuf.
270 * Return value: Color space.
273 gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf)
275 g_return_val_if_fail (pixbuf != NULL, GDK_COLORSPACE_RGB);
277 return pixbuf->colorspace;
281 * gdk_pixbuf_get_n_channels:
284 * Queries the number of channels of a pixbuf.
286 * Return value: Number of channels.
289 gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf)
291 g_return_val_if_fail (pixbuf != NULL, -1);
293 return pixbuf->n_channels;
297 * gdk_pixbuf_get_has_alpha:
300 * Queries whether a pixbuf has an alpha channel (opacity information).
302 * Return value: TRUE if it has an alpha channel, FALSE otherwise.
305 gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf)
307 g_return_val_if_fail (pixbuf != NULL, -1);
309 return pixbuf->has_alpha ? TRUE : FALSE;
313 * gdk_pixbuf_get_bits_per_sample:
316 * Queries the number of bits per color sample in a pixbuf.
318 * Return value: Number of bits per color sample.
321 gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf)
323 g_return_val_if_fail (pixbuf != NULL, -1);
325 return pixbuf->bits_per_sample;
329 * gdk_pixbuf_get_pixels:
332 * Queries a pointer to the pixel data of a pixbuf.
334 * Return value: A pointer to the pixbuf's pixel data.
337 gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf)
339 g_return_val_if_fail (pixbuf != NULL, NULL);
341 return pixbuf->pixels;
345 * gdk_pixbuf_get_width:
348 * Queries the width of a pixbuf.
350 * Return value: Width in pixels.
353 gdk_pixbuf_get_width (const GdkPixbuf *pixbuf)
355 g_return_val_if_fail (pixbuf != NULL, -1);
357 return pixbuf->width;
361 * gdk_pixbuf_get_height:
364 * Queries the height of a pixbuf.
366 * Return value: Height in pixels.
369 gdk_pixbuf_get_height (const GdkPixbuf *pixbuf)
371 g_return_val_if_fail (pixbuf != NULL, -1);
373 return pixbuf->height;
377 * gdk_pixbuf_get_rowstride:
380 * Queries the rowstride of a pixbuf, which is the number of bytes between rows.
382 * Return value: Number of bytes between rows.
385 gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf)
387 g_return_val_if_fail (pixbuf != NULL, -1);
389 return pixbuf->rowstride;
394 /* General initialization hooks */
395 const guint gdk_pixbuf_major_version = GDK_PIXBUF_MAJOR;
396 const guint gdk_pixbuf_minor_version = GDK_PIXBUF_MINOR;
397 const guint gdk_pixbuf_micro_version = GDK_PIXBUF_MICRO;
399 const char *gdk_pixbuf_version = GDK_PIXBUF_VERSION;
402 gdk_pixbuf_preinit (gpointer app, gpointer modinfo)
408 gdk_pixbuf_postinit (gpointer app, gpointer modinfo)
413 gdk_pixbuf_init (void)
415 gdk_pixbuf_preinit (NULL, NULL);
416 gdk_pixbuf_postinit (NULL, NULL);
421 gdk_pixbuf_error_quark (void)
425 q = g_quark_from_static_string ("gdk-pixbuf-error-quark");