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lightning-sunbird  0.9+nobinonly
gfxImageSurface.cpp
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00001 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
00002  * ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Oracle Corporation code.
00016  *
00017  * The Initial Developer of the Original Code is Oracle Corporation.
00018  * Portions created by the Initial Developer are Copyright (C) 2005
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *   Stuart Parmenter <pavlov@pavlov.net>
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
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00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include <stdio.h>
00039 
00040 #include "gfxImageSurface.h"
00041 
00042 THEBES_IMPL_REFCOUNTING(gfxImageSurface)
00043 
00044 gfxImageSurface::gfxImageSurface(gfxImageFormat format, long width, long height) :
00045     mFormat(format), mWidth(width), mHeight(height)
00046 {
00047     long stride = Stride();
00048     mData = new unsigned char[height * stride];
00049 
00050     //memset(mData, 0xff, height*stride);
00051 
00052     cairo_surface_t *surface =
00053         cairo_image_surface_create_for_data((unsigned char*)mData,
00054                                             (cairo_format_t)format,
00055                                             width,
00056                                             height,
00057                                             stride);
00058     Init(surface);
00059 }
00060 
00061 gfxImageSurface::~gfxImageSurface()
00062 {
00063     Destroy();
00064 
00065     delete[] mData;
00066 }
00067 
00068 long
00069 gfxImageSurface::Stride() const
00070 {
00071     long stride;
00072 
00073     if (mFormat == ImageFormatARGB32)
00074         stride = mWidth * 4;
00075     else if (mFormat == ImageFormatRGB24)
00076         stride = mWidth * 3;
00077     else if (mFormat == ImageFormatA8)
00078         stride = mWidth;
00079     else if (mFormat == ImageFormatA1) {
00080         stride = (mWidth + 7) / 8;
00081     } else {
00082         NS_WARNING("Unknown format specified to gfxImageSurface!");
00083         stride = mWidth * 4;
00084     }
00085 
00086     stride = ((stride + 3) / 4) * 4;
00087 
00088     return stride;
00089 }