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,
59 object_type = g_type_register_static (G_TYPE_OBJECT,
68 gdk_pixbuf_class_init (GdkPixbufClass *klass)
70 GObjectClass *object_class = G_OBJECT_CLASS (klass);
72 parent_class = g_type_class_peek_parent (klass);
74 object_class->finalize = gdk_pixbuf_finalize;
78 gdk_pixbuf_finalize (GObject *object)
80 GdkPixbuf *pixbuf = GDK_PIXBUF (object);
82 if (pixbuf->destroy_fn)
83 (* pixbuf->destroy_fn) (pixbuf->pixels, pixbuf->destroy_fn_data);
85 G_OBJECT_CLASS (parent_class)->finalize (object);
92 * Adds a reference to a pixbuf. Deprecated; use g_object_ref().
94 * Return value: The same as the @pixbuf argument.
97 gdk_pixbuf_ref (GdkPixbuf *pixbuf)
99 return (GdkPixbuf *) g_object_ref (G_OBJECT(pixbuf));
106 * Removes a reference from a pixbuf. Deprecated; use
111 gdk_pixbuf_unref (GdkPixbuf *pixbuf)
113 g_object_unref (G_OBJECT (pixbuf));
118 /* Used as the destroy notification function for gdk_pixbuf_new() */
120 free_buffer (guchar *pixels, gpointer data)
127 * @colorspace: Color space for image.
128 * @has_alpha: Whether the image should have transparency information.
129 * @bits_per_sample: Number of bits per color sample.
130 * @width: Width of image in pixels.
131 * @height: Height of image in pixels.
133 * Creates a new #GdkPixbuf structure and allocates a buffer for it. The buffer
134 * has an optimal rowstride. Note that the buffer is not cleared; you will have
135 * to fill it completely yourself.
137 * Return value: A newly-created #GdkPixbuf with a reference count of 1, or NULL
138 * if not enough memory could be allocated for the image buffer.
141 gdk_pixbuf_new (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample,
142 int width, int height)
148 g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, NULL);
149 g_return_val_if_fail (bits_per_sample == 8, NULL);
150 g_return_val_if_fail (width > 0, NULL);
151 g_return_val_if_fail (height > 0, NULL);
153 /* Always align rows to 32-bit boundaries */
155 channels = has_alpha ? 4 : 3;
156 rowstride = 4 * ((channels * width + 3) / 4);
158 buf = malloc (height * rowstride);
162 return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,
163 width, height, rowstride,
171 * Creates a new #GdkPixbuf with a copy of the information in the specified
174 * Return value: A newly-created pixbuf with a reference count of 1, or NULL if
175 * not enough memory could be allocated.
178 gdk_pixbuf_copy (const GdkPixbuf *pixbuf)
183 g_return_val_if_fail (pixbuf != NULL, NULL);
185 /* Calculate a semi-exact size. Here we copy with full rowstrides;
186 * maybe we should copy each row individually with the minimum
190 size = ((pixbuf->height - 1) * pixbuf->rowstride +
191 pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8));
193 buf = malloc (size * sizeof (guchar));
197 memcpy (buf, pixbuf->pixels, size);
199 return gdk_pixbuf_new_from_data (buf,
200 pixbuf->colorspace, pixbuf->has_alpha,
201 pixbuf->bits_per_sample,
202 pixbuf->width, pixbuf->height,
209 * gdk_pixbuf_new_subpixbuf:
210 * @src_pixbuf: a #GdkPixbuf
211 * @src_x: X coord in @src_pixbuf
212 * @src_y: Y coord in @src_pixbuf
213 * @width: width of region in @src_pixbuf
214 * @height: height of region in @src_pixbuf
216 * Creates a new pixbuf which represents a sub-region of
217 * @src_pixbuf. The new pixbuf shares its pixels with the
218 * original pixbuf, so writing to one affects both.
219 * The new pixbuf holds a reference to @src_pixbuf, so
220 * @src_pixbuf will not be finalized until the new pixbuf
223 * Return value: a new pixbuf
226 gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,
235 g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), NULL);
236 g_return_val_if_fail (src_x >= 0 && src_x + width <= src_pixbuf->width, NULL);
237 g_return_val_if_fail (src_y >= 0 && src_y + height <= src_pixbuf->height, NULL);
239 pixels = (gdk_pixbuf_get_pixels (src_pixbuf)
240 + src_y * src_pixbuf->rowstride
241 + src_x * src_pixbuf->n_channels);
243 sub = gdk_pixbuf_new_from_data (pixels,
244 src_pixbuf->colorspace,
245 src_pixbuf->has_alpha,
246 src_pixbuf->bits_per_sample,
248 src_pixbuf->rowstride,
251 /* Keep a reference to src_pixbuf */
252 g_object_ref (G_OBJECT (src_pixbuf));
254 g_object_set_qdata_full (G_OBJECT (sub),
255 g_quark_from_static_string ("gdk-pixbuf-subpixbuf-src"),
257 (GDestroyNotify) g_object_unref);
267 * gdk_pixbuf_get_colorspace:
270 * Queries the color space of a pixbuf.
272 * Return value: Color space.
275 gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf)
277 g_return_val_if_fail (pixbuf != NULL, GDK_COLORSPACE_RGB);
279 return pixbuf->colorspace;
283 * gdk_pixbuf_get_n_channels:
286 * Queries the number of channels of a pixbuf.
288 * Return value: Number of channels.
291 gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf)
293 g_return_val_if_fail (pixbuf != NULL, -1);
295 return pixbuf->n_channels;
299 * gdk_pixbuf_get_has_alpha:
302 * Queries whether a pixbuf has an alpha channel (opacity information).
304 * Return value: TRUE if it has an alpha channel, FALSE otherwise.
307 gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf)
309 g_return_val_if_fail (pixbuf != NULL, -1);
311 return pixbuf->has_alpha ? TRUE : FALSE;
315 * gdk_pixbuf_get_bits_per_sample:
318 * Queries the number of bits per color sample in a pixbuf.
320 * Return value: Number of bits per color sample.
323 gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf)
325 g_return_val_if_fail (pixbuf != NULL, -1);
327 return pixbuf->bits_per_sample;
331 * gdk_pixbuf_get_pixels:
334 * Queries a pointer to the pixel data of a pixbuf.
336 * Return value: A pointer to the pixbuf's pixel data.
339 gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf)
341 g_return_val_if_fail (pixbuf != NULL, NULL);
343 return pixbuf->pixels;
347 * gdk_pixbuf_get_width:
350 * Queries the width of a pixbuf.
352 * Return value: Width in pixels.
355 gdk_pixbuf_get_width (const GdkPixbuf *pixbuf)
357 g_return_val_if_fail (pixbuf != NULL, -1);
359 return pixbuf->width;
363 * gdk_pixbuf_get_height:
366 * Queries the height of a pixbuf.
368 * Return value: Height in pixels.
371 gdk_pixbuf_get_height (const GdkPixbuf *pixbuf)
373 g_return_val_if_fail (pixbuf != NULL, -1);
375 return pixbuf->height;
379 * gdk_pixbuf_get_rowstride:
382 * Queries the rowstride of a pixbuf, which is the number of bytes between rows.
384 * Return value: Number of bytes between rows.
387 gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf)
389 g_return_val_if_fail (pixbuf != NULL, -1);
391 return pixbuf->rowstride;
396 /* General initialization hooks */
397 const guint gdk_pixbuf_major_version = GDK_PIXBUF_MAJOR;
398 const guint gdk_pixbuf_minor_version = GDK_PIXBUF_MINOR;
399 const guint gdk_pixbuf_micro_version = GDK_PIXBUF_MICRO;
401 const char *gdk_pixbuf_version = GDK_PIXBUF_VERSION;
405 gdk_pixbuf_error_quark (void)
409 q = g_quark_from_static_string ("gdk-pixbuf-error-quark");
414 /* Include the marshallers */
415 #include <glib-object.h>
416 #include "gdk-pixbuf-marshal.c"