1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
2 /* GdkPixbuf library - Basic memory management
4 * Copyright (C) 1999 The Free Software Foundation
6 * Authors: Mark Crichton <crichton@gimp.org>
7 * Miguel de Icaza <miguel@gnu.org>
8 * Federico Mena-Quintero <federico@gimp.org>
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.
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.
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.
30 #include "gdk-pixbuf.h"
31 #include "gdk-pixbuf-private.h"
33 static void gdk_pixbuf_class_init (GdkPixbufClass *klass);
34 static void gdk_pixbuf_finalize (GObject *object);
38 static gpointer parent_class;
41 gdk_pixbuf_get_type (void)
43 static GType object_type = 0;
46 static const GTypeInfo object_info = {
47 sizeof (GdkPixbufClass),
49 (GBaseFinalizeFunc) NULL,
50 (GClassInitFunc) gdk_pixbuf_class_init,
51 NULL, /* class_finalize */
52 NULL, /* class_data */
55 (GInstanceInitFunc) NULL,
58 object_type = g_type_register_static (G_TYPE_OBJECT,
67 gdk_pixbuf_class_init (GdkPixbufClass *klass)
69 GObjectClass *object_class = G_OBJECT_CLASS (klass);
71 parent_class = g_type_class_peek_parent (klass);
73 object_class->finalize = gdk_pixbuf_finalize;
77 gdk_pixbuf_finalize (GObject *object)
79 GdkPixbuf *pixbuf = GDK_PIXBUF (object);
81 if (pixbuf->destroy_fn)
82 (* pixbuf->destroy_fn) (pixbuf->pixels, pixbuf->destroy_fn_data);
84 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 (pixbuf);
106 * Removes a reference from a pixbuf. Deprecated; use
111 gdk_pixbuf_unref (GdkPixbuf *pixbuf)
113 g_object_unref (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
134 * buffer has an optimal rowstride. Note that the buffer is not cleared;
135 * you will have to fill it completely yourself.
137 * Return value: A newly-created #GdkPixbuf with a reference count of 1, or
138 * %NULL if not enough memory could be allocated for the image buffer.
141 gdk_pixbuf_new (GdkColorspace colorspace,
152 g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, NULL);
153 g_return_val_if_fail (bits_per_sample == 8, NULL);
154 g_return_val_if_fail (width > 0, NULL);
155 g_return_val_if_fail (height > 0, NULL);
157 if (width <= 0 || height <= 0)
160 channels = has_alpha ? 4 : 3;
161 rowstride = width * channels;
162 if (rowstride / channels != width || rowstride + 3 < 0) /* overflow */
165 /* Always align rows to 32-bit boundaries */
166 rowstride = (rowstride + 3) & ~3;
168 bytes = height * rowstride;
169 if (bytes / rowstride != height) /* overflow */
172 buf = g_try_malloc (bytes);
176 return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,
177 width, height, rowstride,
185 * Creates a new #GdkPixbuf with a copy of the information in the specified
188 * Return value: A newly-created pixbuf with a reference count of 1, or %NULL if
189 * not enough memory could be allocated.
192 gdk_pixbuf_copy (const GdkPixbuf *pixbuf)
197 g_return_val_if_fail (pixbuf != NULL, NULL);
199 /* Calculate a semi-exact size. Here we copy with full rowstrides;
200 * maybe we should copy each row individually with the minimum
204 size = ((pixbuf->height - 1) * pixbuf->rowstride +
205 pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8));
207 buf = g_try_malloc (size * sizeof (guchar));
211 memcpy (buf, pixbuf->pixels, size);
213 return gdk_pixbuf_new_from_data (buf,
214 pixbuf->colorspace, pixbuf->has_alpha,
215 pixbuf->bits_per_sample,
216 pixbuf->width, pixbuf->height,
223 * gdk_pixbuf_new_subpixbuf:
224 * @src_pixbuf: a #GdkPixbuf
225 * @src_x: X coord in @src_pixbuf
226 * @src_y: Y coord in @src_pixbuf
227 * @width: width of region in @src_pixbuf
228 * @height: height of region in @src_pixbuf
230 * Creates a new pixbuf which represents a sub-region of
231 * @src_pixbuf. The new pixbuf shares its pixels with the
232 * original pixbuf, so writing to one affects both.
233 * The new pixbuf holds a reference to @src_pixbuf, so
234 * @src_pixbuf will not be finalized until the new pixbuf
237 * Return value: a new pixbuf
240 gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,
249 g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), NULL);
250 g_return_val_if_fail (src_x >= 0 && src_x + width <= src_pixbuf->width, NULL);
251 g_return_val_if_fail (src_y >= 0 && src_y + height <= src_pixbuf->height, NULL);
253 pixels = (gdk_pixbuf_get_pixels (src_pixbuf)
254 + src_y * src_pixbuf->rowstride
255 + src_x * src_pixbuf->n_channels);
257 sub = gdk_pixbuf_new_from_data (pixels,
258 src_pixbuf->colorspace,
259 src_pixbuf->has_alpha,
260 src_pixbuf->bits_per_sample,
262 src_pixbuf->rowstride,
265 /* Keep a reference to src_pixbuf */
266 g_object_ref (src_pixbuf);
268 g_object_set_qdata_full (G_OBJECT (sub),
269 g_quark_from_static_string ("gdk-pixbuf-subpixbuf-src"),
271 (GDestroyNotify) g_object_unref);
281 * gdk_pixbuf_get_colorspace:
284 * Queries the color space of a pixbuf.
286 * Return value: Color space.
289 gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf)
291 g_return_val_if_fail (pixbuf != NULL, GDK_COLORSPACE_RGB);
293 return pixbuf->colorspace;
297 * gdk_pixbuf_get_n_channels:
300 * Queries the number of channels of a pixbuf.
302 * Return value: Number of channels.
305 gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf)
307 g_return_val_if_fail (pixbuf != NULL, -1);
309 return pixbuf->n_channels;
313 * gdk_pixbuf_get_has_alpha:
316 * Queries whether a pixbuf has an alpha channel (opacity information).
318 * Return value: %TRUE if it has an alpha channel, %FALSE otherwise.
321 gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf)
323 g_return_val_if_fail (pixbuf != NULL, -1);
325 return pixbuf->has_alpha ? TRUE : FALSE;
329 * gdk_pixbuf_get_bits_per_sample:
332 * Queries the number of bits per color sample in a pixbuf.
334 * Return value: Number of bits per color sample.
337 gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf)
339 g_return_val_if_fail (pixbuf != NULL, -1);
341 return pixbuf->bits_per_sample;
345 * gdk_pixbuf_get_pixels:
348 * Queries a pointer to the pixel data of a pixbuf.
350 * Return value: A pointer to the pixbuf's pixel data.
353 gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf)
355 g_return_val_if_fail (pixbuf != NULL, NULL);
357 return pixbuf->pixels;
361 * gdk_pixbuf_get_width:
364 * Queries the width of a pixbuf.
366 * Return value: Width in pixels.
369 gdk_pixbuf_get_width (const GdkPixbuf *pixbuf)
371 g_return_val_if_fail (pixbuf != NULL, -1);
373 return pixbuf->width;
377 * gdk_pixbuf_get_height:
380 * Queries the height of a pixbuf.
382 * Return value: Height in pixels.
385 gdk_pixbuf_get_height (const GdkPixbuf *pixbuf)
387 g_return_val_if_fail (pixbuf != NULL, -1);
389 return pixbuf->height;
393 * gdk_pixbuf_get_rowstride:
396 * Queries the rowstride of a pixbuf, which is the number of bytes between rows.
398 * Return value: Number of bytes between rows.
401 gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf)
403 g_return_val_if_fail (pixbuf != NULL, -1);
405 return pixbuf->rowstride;
410 /* General initialization hooks */
411 const guint gdk_pixbuf_major_version = GDK_PIXBUF_MAJOR;
412 const guint gdk_pixbuf_minor_version = GDK_PIXBUF_MINOR;
413 const guint gdk_pixbuf_micro_version = GDK_PIXBUF_MICRO;
415 const char *gdk_pixbuf_version = GDK_PIXBUF_VERSION;
419 gdk_pixbuf_error_quark (void)
423 q = g_quark_from_static_string ("gdk-pixbuf-error-quark");
430 * @pixbuf: a #GdkPixbuf
431 * @pixel: RGBA pixel to clear to
432 * (0xffffffff is opaque white, 0x00000000 transparent black)
434 * Clears a pixbuf to the given RGBA value, converting the RGBA value into
435 * the pixbuf's pixel format. The alpha will be ignored if the pixbuf
436 * doesn't have an alpha channel.
440 gdk_pixbuf_fill (GdkPixbuf *pixbuf,
448 g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
450 if (pixbuf->width == 0 || pixbuf->height == 0)
453 pixels = pixbuf->pixels;
455 r = (pixel & 0xff000000) >> 24;
456 g = (pixel & 0x00ff0000) >> 16;
457 b = (pixel & 0x0000ff00) >> 8;
458 a = (pixel & 0x000000ff);
466 switch (pixbuf->n_channels) {
488 pixels += pixbuf->rowstride;
495 * gdk_pixbuf_get_option:
496 * @pixbuf: a #GdkPixbuf
497 * @key: a nul-terminated string.
499 * Looks up @key in the list of options that may have been attached to the
500 * @pixbuf when it was loaded.
502 * Return value: the value associated with @key. This is a nul-terminated
503 * string that should not be freed or %NULL if @key was not found.
505 G_CONST_RETURN gchar *
506 gdk_pixbuf_get_option (GdkPixbuf *pixbuf,
512 g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
513 g_return_val_if_fail (key != NULL, NULL);
515 options = g_object_get_qdata (G_OBJECT (pixbuf),
516 g_quark_from_static_string ("gdk_pixbuf_options"));
518 for (i = 0; options[2*i]; i++) {
519 if (strcmp (options[2*i], key) == 0)
520 return options[2*i+1];
528 * gdk_pixbuf_set_option:
529 * @pixbuf: a #GdkPixbuf
530 * @key: a nul-terminated string.
531 * @value: a nul-terminated string.
533 * Attaches a key/value pair as an option to a #GdkPixbuf. If %key already
534 * exists in the list of options attached to @pixbuf, the new value is
535 * ignored and %FALSE is returned.
537 * Return value: %TRUE on success.
540 gdk_pixbuf_set_option (GdkPixbuf *pixbuf,
548 g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), FALSE);
549 g_return_val_if_fail (key != NULL, FALSE);
550 g_return_val_if_fail (value != NULL, FALSE);
552 quark = g_quark_from_static_string ("gdk_pixbuf_options");
554 options = g_object_get_qdata (G_OBJECT (pixbuf), quark);
557 for (n = 0; options[2*n]; n++) {
558 if (strcmp (options[2*n], key) == 0)
562 g_object_steal_qdata (G_OBJECT (pixbuf), quark);
563 options = g_renew (gchar *, options, 2*(n+1) + 1);
565 options = g_new (gchar *, 3);
568 options[2*n] = g_strdup (key);
569 options[2*n+1] = g_strdup (value);
570 options[2*n+2] = NULL;
572 g_object_set_qdata_full (G_OBJECT (pixbuf), quark,
573 options, (GDestroyNotify) g_strfreev);
580 /* Include the marshallers */
581 #include <glib-object.h>
582 #include "gdk-pixbuf-marshal.c"