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2003-08-03 Matthias Clasen <maclas@gmx.de> * gdk-pixbuf.c (gdk_pixbuf_get_rowstride): * gdk-pixbuf-data.c (gdk_pixbuf_new_from_data): Clarify misleading explanation of rowstride. (#119000)
79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
/* GdkPixbuf library - Image creation from in-memory buffers
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*
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Author: 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 "gdk-pixbuf.h"
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#include "gdk-pixbuf-private.h"
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#include <stdlib.h>
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#include <string.h>
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/**
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* gdk_pixbuf_new_from_data:
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* @data: Image data in 8-bit/sample packed format.
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* @colorspace: Colorspace for the image data.
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* @has_alpha: Whether the data has an opacity channel.
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* @bits_per_sample: Number of bits per sample.
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* @width: Width of the image in pixels.
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* @height: Height of the image in pixels.
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* @rowstride: Distance in bytes between row starts.
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* @destroy_fn: Function used to free the data when the pixbuf's reference count
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* drops to zero, or %NULL if the data should not be freed.
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* @destroy_fn_data: Closure data to pass to the destroy notification function.
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*
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* Creates a new #GdkPixbuf out of in-memory image data. Currently only RGB
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* images with 8 bits per sample are supported.
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*
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* Return value: A newly-created #GdkPixbuf structure with a reference count of 1.
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**/
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GdkPixbuf *
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gdk_pixbuf_new_from_data (const guchar *data, GdkColorspace colorspace, gboolean has_alpha,
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int bits_per_sample, int width, int height, int rowstride,
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GdkPixbufDestroyNotify destroy_fn, gpointer destroy_fn_data)
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{
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GdkPixbuf *pixbuf;
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/* Only 8-bit/sample RGB buffers are supported for now */
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g_return_val_if_fail (data != NULL, NULL);
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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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pixbuf = g_object_new (GDK_TYPE_PIXBUF, NULL);
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pixbuf->colorspace = colorspace;
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pixbuf->n_channels = has_alpha ? 4 : 3;
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pixbuf->bits_per_sample = bits_per_sample;
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pixbuf->has_alpha = has_alpha ? TRUE : FALSE;
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pixbuf->width = width;
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pixbuf->height = height;
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pixbuf->rowstride = rowstride;
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pixbuf->pixels = (guchar *) data;
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pixbuf->destroy_fn = destroy_fn;
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pixbuf->destroy_fn_data = destroy_fn_data;
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return pixbuf;
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}
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