/* GdkPixbuf library - Basic memory management * * Copyright (C) 1999 The Free Software Foundation * * Authors: Mark Crichton * Miguel de Icaza * Federico Mena-Quintero * * 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. */ #include #include #include #include #include "gdk-pixbuf.h" #include "gdk-pixbuf-private.h" static void gdk_pixbuf_class_init (GdkPixbufClass *klass); static void gdk_pixbuf_finalize (GObject *object); static gpointer parent_class; GType gdk_pixbuf_get_type (void) { static GType object_type = 0; if (!object_type) { static const GTypeInfo object_info = { sizeof (GdkPixbufClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gdk_pixbuf_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (GdkPixbuf), 0, /* n_preallocs */ (GInstanceInitFunc) NULL, }; object_type = g_type_register_static (G_TYPE_OBJECT, "GdkPixbuf", &object_info); } return object_type; } static void gdk_pixbuf_class_init (GdkPixbufClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); parent_class = g_type_class_peek_parent (klass); object_class->finalize = gdk_pixbuf_finalize; } static void gdk_pixbuf_finalize (GObject *object) { GdkPixbuf *pixbuf = GDK_PIXBUF (object); if (pixbuf->destroy_fn) (* pixbuf->destroy_fn) (pixbuf->pixels, pixbuf->destroy_fn_data); G_OBJECT_CLASS (parent_class)->finalize (object); } /** * gdk_pixbuf_ref: * @pixbuf: A pixbuf. * * Adds a reference to a pixbuf. Deprecated; use g_object_ref(). * * Return value: The same as the @pixbuf argument. **/ GdkPixbuf * gdk_pixbuf_ref (GdkPixbuf *pixbuf) { return (GdkPixbuf *) g_object_ref (G_OBJECT(pixbuf)); } /** * gdk_pixbuf_unref: * @pixbuf: A pixbuf. * * Removes a reference from a pixbuf. Deprecated; use * g_object_unref(). * **/ void gdk_pixbuf_unref (GdkPixbuf *pixbuf) { g_object_unref (G_OBJECT (pixbuf)); } /* Used as the destroy notification function for gdk_pixbuf_new() */ static void free_buffer (guchar *pixels, gpointer data) { free (pixels); } /** * gdk_pixbuf_new: * @colorspace: Color space for image. * @has_alpha: Whether the image should have transparency information. * @bits_per_sample: Number of bits per color sample. * @width: Width of image in pixels. * @height: Height of image in pixels. * * Creates a new #GdkPixbuf structure and allocates a buffer for it. The buffer * has an optimal rowstride. Note that the buffer is not cleared; you will have * to fill it completely yourself. * * Return value: A newly-created #GdkPixbuf with a reference count of 1, or NULL * if not enough memory could be allocated for the image buffer. **/ GdkPixbuf * gdk_pixbuf_new (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample, int width, int height) { guchar *buf; int channels; int rowstride; g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, NULL); g_return_val_if_fail (bits_per_sample == 8, NULL); g_return_val_if_fail (width > 0, NULL); g_return_val_if_fail (height > 0, NULL); /* Always align rows to 32-bit boundaries */ channels = has_alpha ? 4 : 3; rowstride = 4 * ((channels * width + 3) / 4); buf = malloc (height * rowstride); if (!buf) return NULL; return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample, width, height, rowstride, free_buffer, NULL); } /** * gdk_pixbuf_copy: * @pixbuf: A pixbuf. * * Creates a new #GdkPixbuf with a copy of the information in the specified * @pixbuf. * * Return value: A newly-created pixbuf with a reference count of 1, or NULL if * not enough memory could be allocated. **/ GdkPixbuf * gdk_pixbuf_copy (const GdkPixbuf *pixbuf) { guchar *buf; int size; g_return_val_if_fail (pixbuf != NULL, NULL); /* Calculate a semi-exact size. Here we copy with full rowstrides; * maybe we should copy each row individually with the minimum * rowstride? */ size = ((pixbuf->height - 1) * pixbuf->rowstride + pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8)); buf = malloc (size * sizeof (guchar)); if (!buf) return NULL; memcpy (buf, pixbuf->pixels, size); return gdk_pixbuf_new_from_data (buf, pixbuf->colorspace, pixbuf->has_alpha, pixbuf->bits_per_sample, pixbuf->width, pixbuf->height, pixbuf->rowstride, free_buffer, NULL); } /* Accessors */ /** * gdk_pixbuf_get_colorspace: * @pixbuf: A pixbuf. * * Queries the color space of a pixbuf. * * Return value: Color space. **/ GdkColorspace gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, GDK_COLORSPACE_RGB); return pixbuf->colorspace; } /** * gdk_pixbuf_get_n_channels: * @pixbuf: A pixbuf. * * Queries the number of channels of a pixbuf. * * Return value: Number of channels. **/ int gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, -1); return pixbuf->n_channels; } /** * gdk_pixbuf_get_has_alpha: * @pixbuf: A pixbuf. * * Queries whether a pixbuf has an alpha channel (opacity information). * * Return value: TRUE if it has an alpha channel, FALSE otherwise. **/ gboolean gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, -1); return pixbuf->has_alpha ? TRUE : FALSE; } /** * gdk_pixbuf_get_bits_per_sample: * @pixbuf: A pixbuf. * * Queries the number of bits per color sample in a pixbuf. * * Return value: Number of bits per color sample. **/ int gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, -1); return pixbuf->bits_per_sample; } /** * gdk_pixbuf_get_pixels: * @pixbuf: A pixbuf. * * Queries a pointer to the pixel data of a pixbuf. * * Return value: A pointer to the pixbuf's pixel data. **/ guchar * gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, NULL); return pixbuf->pixels; } /** * gdk_pixbuf_get_width: * @pixbuf: A pixbuf. * * Queries the width of a pixbuf. * * Return value: Width in pixels. **/ int gdk_pixbuf_get_width (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, -1); return pixbuf->width; } /** * gdk_pixbuf_get_height: * @pixbuf: A pixbuf. * * Queries the height of a pixbuf. * * Return value: Height in pixels. **/ int gdk_pixbuf_get_height (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, -1); return pixbuf->height; } /** * gdk_pixbuf_get_rowstride: * @pixbuf: A pixbuf. * * Queries the rowstride of a pixbuf, which is the number of bytes between rows. * * Return value: Number of bytes between rows. **/ int gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf) { g_return_val_if_fail (pixbuf != NULL, -1); return pixbuf->rowstride; } /* General initialization hooks */ const guint gdk_pixbuf_major_version = GDK_PIXBUF_MAJOR; const guint gdk_pixbuf_minor_version = GDK_PIXBUF_MINOR; const guint gdk_pixbuf_micro_version = GDK_PIXBUF_MICRO; const char *gdk_pixbuf_version = GDK_PIXBUF_VERSION; void gdk_pixbuf_preinit (gpointer app, gpointer modinfo) { g_type_init (); } void gdk_pixbuf_postinit (gpointer app, gpointer modinfo) { } void gdk_pixbuf_init (void) { gdk_pixbuf_preinit (NULL, NULL); gdk_pixbuf_postinit (NULL, NULL); } /* Error quark */ GQuark gdk_pixbuf_error_quark (void) { static GQuark q = 0; if (q == 0) q = g_quark_from_static_string ("gdk-pixbuf-error-quark"); return q; }