-/*
- * gdk-pixbuf.c: Resource management.
+/* GdkPixbuf library - Basic memory management
*
- * Author:
- * Miguel de Icaza (miguel@gnu.org)
+ * Copyright (C) 1999 The Free Software Foundation
+ *
+ * Authors: Mark Crichton <crichton@gimp.org>
+ * Miguel de Icaza <miguel@gnu.org>
+ * Federico Mena-Quintero <federico@gimp.org>
+ *
+ * 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 <config.h>
-#include <glib.h>
-#include <libart_lgpl/art_misc.h>
-#include <libart_lgpl/art_rgb_affine.h>
-#include <libart_lgpl/art_alphagamma.h>
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
#include "gdk-pixbuf.h"
+#include "gdk-pixbuf-private.h"
+
+static void gdk_pixbuf_class_init (GdkPixbufClass *klass);
+static void gdk_pixbuf_finalize (GObject *object);
+
+\f
+
+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, 0);
+ }
+
+ 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));
+}
+\f
+/* Used as the destroy notification function for gdk_pixbuf_new() */
static void
-gdk_pixbuf_destroy (GdkPixBuf *pixbuf)
+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);
+}
+
+/**
+ * gdk_pixbuf_new_subpixbuf:
+ * @src_pixbuf: a #GdkPixbuf
+ * @src_x: X coord in @src_pixbuf
+ * @src_y: Y coord in @src_pixbuf
+ * @width: width of region in @src_pixbuf
+ * @height: height of region in @src_pixbuf
+ *
+ * Creates a new pixbuf which represents a sub-region of
+ * @src_pixbuf. The new pixbuf shares its pixels with the
+ * original pixbuf, so writing to one affects both.
+ * The new pixbuf holds a reference to @src_pixbuf, so
+ * @src_pixbuf will not be finalized until the new pixbuf
+ * is finalized.
+ *
+ * Return value: a new pixbuf
+ **/
+GdkPixbuf*
+gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,
+ int src_x,
+ int src_y,
+ int width,
+ int height)
+{
+ guchar *pixels;
+ GdkPixbuf *sub;
+
+ g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), NULL);
+ g_return_val_if_fail (src_x >= 0 && src_x + width <= src_pixbuf->width, NULL);
+ g_return_val_if_fail (src_y >= 0 && src_y + height <= src_pixbuf->height, NULL);
+
+ pixels = (gdk_pixbuf_get_pixels (src_pixbuf)
+ + src_y * src_pixbuf->rowstride
+ + src_x * src_pixbuf->n_channels);
+
+ sub = gdk_pixbuf_new_from_data (pixels,
+ src_pixbuf->colorspace,
+ src_pixbuf->has_alpha,
+ src_pixbuf->bits_per_sample,
+ width, height,
+ src_pixbuf->rowstride,
+ NULL, NULL);
+
+ /* Keep a reference to src_pixbuf */
+ g_object_ref (G_OBJECT (src_pixbuf));
+
+ g_object_set_qdata_full (G_OBJECT (sub),
+ g_quark_from_static_string ("gdk-pixbuf-subpixbuf-src"),
+ src_pixbuf,
+ (GDestroyNotify) g_object_unref);
+
+ return sub;
+}
+
+\f
+
+/* 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)
{
- art_pixbuf_free (pixbuf->art_pixbuf);
- g_free (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;
+}
+
+\f
+
+/* 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_ref (GdkPixBuf *pixbuf)
+gdk_pixbuf_preinit (gpointer app, gpointer modinfo)
{
- g_return_if_fail (pixbuf != NULL);
-
- pixbuf->ref_count++;
+ g_type_init ();
}
void
-gdk_pixbuf_unref (GdkPixBuf *pixbuf)
+gdk_pixbuf_postinit (gpointer app, gpointer modinfo)
{
- g_return_if_fail (pixbuf != NULL);
- g_return_if_fail (pixbuf->ref_count == 0);
-
- pixbuf->ref_count--;
- if (pixbuf->ref_count)
- gdk_pixbuf_destroy (pixbuf);
}
void
-gdk_pixbuf_free (GdkPixBuf *pixbuf)
-{
- art_free(pixbuf->art_pixbuf->pixels);
- art_pixbuf_free_shallow(pixbuf->art_pixbuf);
- g_free(pixbuf);
-}
-
-GdkPixBuf *
-gdk_pixbuf_scale (GdkPixBuf *pixbuf, gint w, gint h)
-{
- GdkPixBuf *spb;
- art_u8 *pixels;
- double affine[6];
- ArtAlphaGamma *alphagamma;
-
- alphagamma = NULL;
-
- affine[0] = affine[3] = 1;
- affine[4] = affine[5] = 0;
-
- affine[1] = w / (pixbuf->art_pixbuf->width);
- affine[2] = h / (pixbuf->art_pixbuf->height);
-
- spb = g_new (GdkPixBuf, 1);
-
- if (pixbuf->art_pixbuf->has_alpha) {
- /* Following code is WRONG....of course, the code for this
- * transform isn't in libart yet.
- */
-#if 0
- pixels = art_alloc (h * w * 4);
- art_rgb_affine( pixels, 0, 0, w, h, (w * 4),
- pixbuf->art_pixbuf->pixels,
- pixbuf->art_pixbuf->width,
- pixbuf->art_pixbuf->height,
- pixbuf->art_pixbuf->rowstride,
- affine, ART_FILTER_NEAREST, alphagamma);
- spb->art_pixbuf = art_pixbuf_new_rgba(pixels, w, h, (w * 4));
-#endif
- } else {
- art_alloc (h * w * 3);
- art_rgb_affine( pixels, 0, 0, w, h, (w * 3),
- pixbuf->art_pixbuf->pixels,
- pixbuf->art_pixbuf->width,
- pixbuf->art_pixbuf->height,
- pixbuf->art_pixbuf->rowstride,
- affine, ART_FILTER_NEAREST, alphagamma);
- spb->art_pixbuf = art_pixbuf_new_rgb(pixels, w, h, (w * 3));
- }
+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;
}
projects / ~andy / gtk / blobdiff