148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/* LIBPIKA - The PIKA Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* pikapixbuf.c
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* Copyright (C) 2004 Sven Neumann <sven@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 3 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
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* <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "pika.h"
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#include "pikapixbuf.h"
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/*
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* The data that is passed to this function is either freed here or
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* owned by the returned pixbuf.
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*/
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GdkPixbuf *
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_pika_pixbuf_from_data (guchar *data,
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gint width,
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gint height,
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gint bpp,
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PikaPixbufTransparency alpha)
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{
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GdkPixbuf *pixbuf;
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switch (bpp)
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{
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case 1:
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pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
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{
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guchar *src = data;
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guchar *pixels = gdk_pixbuf_get_pixels (pixbuf);
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gint rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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gint y;
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for (y = 0; y < height; y++)
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{
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guchar *dest = pixels;
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gint x;
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for (x = 0; x < width; x++, src += 1, dest += 3)
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{
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dest[0] = dest[1] = dest[2] = src[0];
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}
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pixels += rowstride;
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}
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g_free (data);
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}
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bpp = 3;
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break;
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case 2:
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pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
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{
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guchar *src = data;
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guchar *pixels = gdk_pixbuf_get_pixels (pixbuf);
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gint rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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gint y;
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for (y = 0; y < height; y++)
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{
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guchar *dest = pixels;
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gint x;
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for (x = 0; x < width; x++, src += 2, dest += 4)
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{
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dest[0] = dest[1] = dest[2] = src[0];
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dest[3] = src[1];
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}
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pixels += rowstride;
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}
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g_free (data);
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}
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bpp = 4;
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break;
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case 3:
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pixbuf = gdk_pixbuf_new_from_data (data,
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GDK_COLORSPACE_RGB, FALSE, 8,
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width, height, width * bpp,
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(GdkPixbufDestroyNotify) g_free, NULL);
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break;
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case 4:
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pixbuf = gdk_pixbuf_new_from_data (data,
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GDK_COLORSPACE_RGB, TRUE, 8,
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width, height, width * bpp,
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(GdkPixbufDestroyNotify) g_free, NULL);
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break;
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default:
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g_return_val_if_reached (NULL);
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return NULL;
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}
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if (bpp == 4)
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{
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GdkPixbuf *tmp;
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gint check_size = 0;
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switch (alpha)
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{
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case PIKA_PIXBUF_KEEP_ALPHA:
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return pixbuf;
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case PIKA_PIXBUF_SMALL_CHECKS:
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check_size = PIKA_CHECK_SIZE_SM;
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break;
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case PIKA_PIXBUF_LARGE_CHECKS:
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check_size = PIKA_CHECK_SIZE;
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break;
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}
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tmp = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
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gdk_pixbuf_composite_color (pixbuf, tmp,
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0, 0, width, height, 0, 0, 1.0, 1.0,
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GDK_INTERP_NEAREST, 255,
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0, 0, check_size, 0x66666666, 0x99999999);
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g_object_unref (pixbuf);
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pixbuf = tmp;
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}
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return pixbuf;
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}
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