forked from AuroraMiddleware/gtk
587 lines
15 KiB
C
587 lines
15 KiB
C
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
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/* GdkPixbuf library - Basic memory management
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*
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Authors: Mark Crichton <crichton@gimp.org>
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* Miguel de Icaza <miguel@gnu.org>
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* Federico Mena-Quintero <federico@gimp.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include "gdk-pixbuf.h"
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#include "gdk-pixbuf-private.h"
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static void gdk_pixbuf_class_init (GdkPixbufClass *klass);
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static void gdk_pixbuf_finalize (GObject *object);
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static gpointer parent_class;
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GType
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gdk_pixbuf_get_type (void)
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{
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static GType object_type = 0;
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if (!object_type) {
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static const GTypeInfo object_info = {
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sizeof (GdkPixbufClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gdk_pixbuf_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GdkPixbuf),
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0, /* n_preallocs */
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(GInstanceInitFunc) NULL,
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};
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object_type = g_type_register_static (G_TYPE_OBJECT,
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"GdkPixbuf",
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&object_info, 0);
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}
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return object_type;
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}
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static void
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gdk_pixbuf_class_init (GdkPixbufClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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object_class->finalize = gdk_pixbuf_finalize;
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}
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static void
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gdk_pixbuf_finalize (GObject *object)
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{
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GdkPixbuf *pixbuf = GDK_PIXBUF (object);
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if (pixbuf->destroy_fn)
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(* pixbuf->destroy_fn) (pixbuf->pixels, pixbuf->destroy_fn_data);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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/**
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* gdk_pixbuf_ref:
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* @pixbuf: A pixbuf.
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*
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* Adds a reference to a pixbuf.
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*
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* Return value: The same as the @pixbuf argument.
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*
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* Deprecated: Use g_object_ref().
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**/
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GdkPixbuf *
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gdk_pixbuf_ref (GdkPixbuf *pixbuf)
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{
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return (GdkPixbuf *) g_object_ref (pixbuf);
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}
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/**
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* gdk_pixbuf_unref:
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* @pixbuf: A pixbuf.
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*
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* Removes a reference from a pixbuf.
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*
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* Deprecated: Use g_object_unref().
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**/
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void
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gdk_pixbuf_unref (GdkPixbuf *pixbuf)
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{
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g_object_unref (pixbuf);
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}
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/* Used as the destroy notification function for gdk_pixbuf_new() */
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static void
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free_buffer (guchar *pixels, gpointer data)
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{
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g_free (pixels);
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}
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/**
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* gdk_pixbuf_new:
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* @colorspace: Color space for image.
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* @has_alpha: Whether the image should have transparency information.
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* @bits_per_sample: Number of bits per color sample.
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* @width: Width of image in pixels.
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* @height: Height of image in pixels.
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*
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* Creates a new #GdkPixbuf structure and allocates a buffer for it. The
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* buffer has an optimal rowstride. Note that the buffer is not cleared;
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* you will have to fill it completely yourself.
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*
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* Return value: A newly-created #GdkPixbuf with a reference count of 1, or
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* %NULL if not enough memory could be allocated for the image buffer.
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**/
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GdkPixbuf *
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gdk_pixbuf_new (GdkColorspace colorspace,
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gboolean has_alpha,
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int bits_per_sample,
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int width,
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int height)
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{
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guchar *buf;
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int channels;
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int rowstride;
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gsize bytes;
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g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, NULL);
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g_return_val_if_fail (bits_per_sample == 8, NULL);
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g_return_val_if_fail (width > 0, NULL);
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g_return_val_if_fail (height > 0, NULL);
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if (width <= 0 || height <= 0)
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return NULL;
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channels = has_alpha ? 4 : 3;
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rowstride = width * channels;
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if (rowstride / channels != width || rowstride + 3 < 0) /* overflow */
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return NULL;
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/* Always align rows to 32-bit boundaries */
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rowstride = (rowstride + 3) & ~3;
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bytes = height * rowstride;
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if (bytes / rowstride != height) /* overflow */
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return NULL;
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buf = g_try_malloc (bytes);
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if (!buf)
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return NULL;
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return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,
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width, height, rowstride,
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free_buffer, NULL);
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}
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/**
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* gdk_pixbuf_copy:
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* @pixbuf: A pixbuf.
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*
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* Creates a new #GdkPixbuf with a copy of the information in the specified
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* @pixbuf.
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*
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* Return value: A newly-created pixbuf with a reference count of 1, or %NULL if
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* not enough memory could be allocated.
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**/
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GdkPixbuf *
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gdk_pixbuf_copy (const GdkPixbuf *pixbuf)
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{
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guchar *buf;
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int size;
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g_return_val_if_fail (pixbuf != NULL, NULL);
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/* Calculate a semi-exact size. Here we copy with full rowstrides;
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* maybe we should copy each row individually with the minimum
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* rowstride?
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*/
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size = ((pixbuf->height - 1) * pixbuf->rowstride +
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pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8));
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buf = g_try_malloc (size * sizeof (guchar));
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if (!buf)
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return NULL;
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memcpy (buf, pixbuf->pixels, size);
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return gdk_pixbuf_new_from_data (buf,
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pixbuf->colorspace, pixbuf->has_alpha,
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pixbuf->bits_per_sample,
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pixbuf->width, pixbuf->height,
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pixbuf->rowstride,
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free_buffer,
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NULL);
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}
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/**
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* gdk_pixbuf_new_subpixbuf:
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* @src_pixbuf: a #GdkPixbuf
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* @src_x: X coord in @src_pixbuf
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* @src_y: Y coord in @src_pixbuf
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* @width: width of region in @src_pixbuf
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* @height: height of region in @src_pixbuf
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*
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* Creates a new pixbuf which represents a sub-region of
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* @src_pixbuf. The new pixbuf shares its pixels with the
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* original pixbuf, so writing to one affects both.
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* The new pixbuf holds a reference to @src_pixbuf, so
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* @src_pixbuf will not be finalized until the new pixbuf
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* is finalized.
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*
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* Return value: a new pixbuf
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**/
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GdkPixbuf*
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gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,
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int src_x,
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int src_y,
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int width,
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int height)
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{
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guchar *pixels;
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GdkPixbuf *sub;
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g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), NULL);
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g_return_val_if_fail (src_x >= 0 && src_x + width <= src_pixbuf->width, NULL);
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g_return_val_if_fail (src_y >= 0 && src_y + height <= src_pixbuf->height, NULL);
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pixels = (gdk_pixbuf_get_pixels (src_pixbuf)
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+ src_y * src_pixbuf->rowstride
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+ src_x * src_pixbuf->n_channels);
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sub = gdk_pixbuf_new_from_data (pixels,
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src_pixbuf->colorspace,
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src_pixbuf->has_alpha,
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src_pixbuf->bits_per_sample,
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width, height,
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src_pixbuf->rowstride,
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NULL, NULL);
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/* Keep a reference to src_pixbuf */
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g_object_ref (src_pixbuf);
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g_object_set_qdata_full (G_OBJECT (sub),
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g_quark_from_static_string ("gdk-pixbuf-subpixbuf-src"),
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src_pixbuf,
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(GDestroyNotify) g_object_unref);
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return sub;
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}
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/* Accessors */
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/**
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* gdk_pixbuf_get_colorspace:
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* @pixbuf: A pixbuf.
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*
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* Queries the color space of a pixbuf.
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*
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* Return value: Color space.
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**/
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GdkColorspace
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gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, GDK_COLORSPACE_RGB);
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return pixbuf->colorspace;
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}
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/**
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* gdk_pixbuf_get_n_channels:
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* @pixbuf: A pixbuf.
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*
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* Queries the number of channels of a pixbuf.
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*
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* Return value: Number of channels.
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**/
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int
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gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, -1);
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return pixbuf->n_channels;
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}
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/**
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* gdk_pixbuf_get_has_alpha:
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* @pixbuf: A pixbuf.
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*
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* Queries whether a pixbuf has an alpha channel (opacity information).
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*
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* Return value: %TRUE if it has an alpha channel, %FALSE otherwise.
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**/
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gboolean
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gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, -1);
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return pixbuf->has_alpha ? TRUE : FALSE;
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}
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/**
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* gdk_pixbuf_get_bits_per_sample:
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* @pixbuf: A pixbuf.
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*
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* Queries the number of bits per color sample in a pixbuf.
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*
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* Return value: Number of bits per color sample.
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**/
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int
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gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, -1);
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return pixbuf->bits_per_sample;
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}
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/**
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* gdk_pixbuf_get_pixels:
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* @pixbuf: A pixbuf.
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*
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* Queries a pointer to the pixel data of a pixbuf.
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*
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* Return value: A pointer to the pixbuf's pixel data.
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**/
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guchar *
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gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, NULL);
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return pixbuf->pixels;
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}
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/**
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* gdk_pixbuf_get_width:
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* @pixbuf: A pixbuf.
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*
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* Queries the width of a pixbuf.
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*
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* Return value: Width in pixels.
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**/
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int
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gdk_pixbuf_get_width (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, -1);
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return pixbuf->width;
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}
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/**
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* gdk_pixbuf_get_height:
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* @pixbuf: A pixbuf.
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*
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* Queries the height of a pixbuf.
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*
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* Return value: Height in pixels.
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**/
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int
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gdk_pixbuf_get_height (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, -1);
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return pixbuf->height;
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}
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/**
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* gdk_pixbuf_get_rowstride:
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* @pixbuf: A pixbuf.
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*
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* Queries the rowstride of a pixbuf, which is the number of bytes between rows.
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*
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* Return value: Number of bytes between rows.
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**/
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int
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gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf)
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{
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g_return_val_if_fail (pixbuf != NULL, -1);
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return pixbuf->rowstride;
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}
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/* General initialization hooks */
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const guint gdk_pixbuf_major_version = GDK_PIXBUF_MAJOR;
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const guint gdk_pixbuf_minor_version = GDK_PIXBUF_MINOR;
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const guint gdk_pixbuf_micro_version = GDK_PIXBUF_MICRO;
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const char *gdk_pixbuf_version = GDK_PIXBUF_VERSION;
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/* Error quark */
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GQuark
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gdk_pixbuf_error_quark (void)
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{
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static GQuark q = 0;
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if (q == 0)
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q = g_quark_from_static_string ("gdk-pixbuf-error-quark");
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return q;
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}
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/**
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* gdk_pixbuf_fill:
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* @pixbuf: a #GdkPixbuf
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* @pixel: RGBA pixel to clear to
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* (0xffffffff is opaque white, 0x00000000 transparent black)
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*
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* Clears a pixbuf to the given RGBA value, converting the RGBA value into
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* the pixbuf's pixel format. The alpha will be ignored if the pixbuf
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* doesn't have an alpha channel.
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*
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**/
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void
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gdk_pixbuf_fill (GdkPixbuf *pixbuf,
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guint32 pixel)
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{
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guchar *pixels;
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guint r, g, b, a;
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guchar *p;
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guint w, h;
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g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
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if (pixbuf->width == 0 || pixbuf->height == 0)
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return;
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pixels = pixbuf->pixels;
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r = (pixel & 0xff000000) >> 24;
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g = (pixel & 0x00ff0000) >> 16;
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b = (pixel & 0x0000ff00) >> 8;
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a = (pixel & 0x000000ff);
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h = pixbuf->height;
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while (h--) {
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w = pixbuf->width;
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p = pixels;
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switch (pixbuf->n_channels) {
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case 3:
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while (w--) {
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p[0] = r;
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p[1] = g;
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p[2] = b;
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p += 3;
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}
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break;
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case 4:
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while (w--) {
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p[0] = r;
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p[1] = g;
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p[2] = b;
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p[3] = a;
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p += 4;
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}
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break;
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default:
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break;
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}
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pixels += pixbuf->rowstride;
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}
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}
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/**
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* gdk_pixbuf_get_option:
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* @pixbuf: a #GdkPixbuf
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* @key: a nul-terminated string.
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*
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* Looks up @key in the list of options that may have been attached to the
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* @pixbuf when it was loaded.
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*
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* Return value: the value associated with @key. This is a nul-terminated
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* string that should not be freed or %NULL if @key was not found.
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**/
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G_CONST_RETURN gchar *
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gdk_pixbuf_get_option (GdkPixbuf *pixbuf,
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const gchar *key)
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{
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gchar **options;
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gint i;
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g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
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g_return_val_if_fail (key != NULL, NULL);
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options = g_object_get_qdata (G_OBJECT (pixbuf),
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g_quark_from_static_string ("gdk_pixbuf_options"));
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if (options) {
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for (i = 0; options[2*i]; i++) {
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if (strcmp (options[2*i], key) == 0)
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return options[2*i+1];
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}
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}
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return NULL;
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}
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/**
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* gdk_pixbuf_set_option:
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* @pixbuf: a #GdkPixbuf
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* @key: a nul-terminated string.
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* @value: a nul-terminated string.
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*
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* Attaches a key/value pair as an option to a #GdkPixbuf. If %key already
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* exists in the list of options attached to @pixbuf, the new value is
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* ignored and %FALSE is returned.
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*
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* Return value: %TRUE on success.
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*
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* Since: 2.2
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**/
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gboolean
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gdk_pixbuf_set_option (GdkPixbuf *pixbuf,
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const gchar *key,
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const gchar *value)
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{
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GQuark quark;
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gchar **options;
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gint n = 0;
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|
||
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), FALSE);
|
||
g_return_val_if_fail (key != NULL, FALSE);
|
||
g_return_val_if_fail (value != NULL, FALSE);
|
||
|
||
quark = g_quark_from_static_string ("gdk_pixbuf_options");
|
||
|
||
options = g_object_get_qdata (G_OBJECT (pixbuf), quark);
|
||
|
||
if (options) {
|
||
for (n = 0; options[2*n]; n++) {
|
||
if (strcmp (options[2*n], key) == 0)
|
||
return FALSE;
|
||
}
|
||
|
||
g_object_steal_qdata (G_OBJECT (pixbuf), quark);
|
||
options = g_renew (gchar *, options, 2*(n+1) + 1);
|
||
} else {
|
||
options = g_new (gchar *, 3);
|
||
}
|
||
|
||
options[2*n] = g_strdup (key);
|
||
options[2*n+1] = g_strdup (value);
|
||
options[2*n+2] = NULL;
|
||
|
||
g_object_set_qdata_full (G_OBJECT (pixbuf), quark,
|
||
options, (GDestroyNotify) g_strfreev);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
|
||
/* Include the marshallers */
|
||
#include <glib-object.h>
|
||
#include "gdk-pixbuf-marshal.c"
|