126 lines
4.7 KiB
C
126 lines
4.7 KiB
C
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/* 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, see <http://www.gnu.org/licenses/>.
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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: (array): 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, must be > 0
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* @height: Height of the image in pixels, must be > 0
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* @rowstride: Distance in bytes between row starts
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* @destroy_fn: (scope async) (allow-none): 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): 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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* Since you are providing a pre-allocated pixel buffer, you must also
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* specify a way to free that data. This is done with a function of
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* type #GdkPixbufDestroyNotify. When a pixbuf created with is
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* finalized, your destroy notification function will be called, and
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* it is its responsibility to free the pixel array.
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*
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* See also gdk_pixbuf_new_from_bytes().
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*
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* Return value: (transfer full): 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,
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"colorspace", colorspace,
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"n-channels", has_alpha ? 4 : 3,
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"bits-per-sample", bits_per_sample,
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"has-alpha", has_alpha ? TRUE : FALSE,
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"width", width,
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"height", height,
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"rowstride", rowstride,
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"pixels", data,
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NULL);
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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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/**
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* gdk_pixbuf_new_from_bytes:
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* @data: Image data in 8-bit/sample packed format inside a #GBytes
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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, must be > 0
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* @height: Height of the image in pixels, must be > 0
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* @rowstride: Distance in bytes between row starts
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*
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* Creates a new #GdkPixbuf out of in-memory readonly image data.
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* Currently only RGB images with 8 bits per sample are supported.
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* This is the #GBytes variant of gdk_pixbuf_new_from_data().
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*
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* Return value: (transfer full): A newly-created #GdkPixbuf structure with a reference count of 1.
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* Since: 2.32
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**/
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GdkPixbuf *
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gdk_pixbuf_new_from_bytes (GBytes *data, GdkColorspace colorspace, gboolean has_alpha,
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int bits_per_sample, int width, int height, int rowstride)
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{
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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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g_return_val_if_fail (g_bytes_get_size (data) >= width * height * (has_alpha ? 4 : 3), NULL);
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return (GdkPixbuf*) g_object_new (GDK_TYPE_PIXBUF,
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"pixel-bytes", data,
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"colorspace", colorspace,
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"n-channels", has_alpha ? 4 : 3,
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"bits-per-sample", bits_per_sample,
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"has-alpha", has_alpha ? TRUE : FALSE,
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"width", width,
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"height", height,
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"rowstride", rowstride,
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NULL);
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}
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