gfx/thebes/src/gfxImageSurface.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  * ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
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  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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  13  * License.
  14  *
  15  * The Original Code is Oracle Corporation code.
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  17  * The Initial Developer of the Original Code is Oracle Corporation.
  18  * Portions created by the Initial Developer are Copyright (C) 2005
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *   Stuart Parmenter <pavlov@pavlov.net>
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  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #include "prmem.h"
  39
  40 #include "gfxImageSurface.h"
  41
  42 #include "cairo.h"
  43
  44 gfxImageSurface::gfxImageSurface(const gfxIntSize& size, gfxImageFormat format) :
  45     mSize(size), mFormat(format)
  46 {
  47     mStride = ComputeStride();
  48
  49     if (!CheckSurfaceSize(size))
  50         return;
  51
  52     // if we have a zero-sized surface, just set mData to nsnull
  53     if (mSize.height * mStride > 0) {
  54         mData = (unsigned char *) calloc(mSize.height, mStride);
  55         if (!mData)
  56             return;
  57     } else {
  58         mData = nsnull;
  59     }
  60
  61     mOwnsData = PR_TRUE;
  62
  63     cairo_surface_t *surface =
  64         cairo_image_surface_create_for_data((unsigned char*)mData,
  65                                             (cairo_format_t)format,
  66                                             mSize.width,
  67                                             mSize.height,
  68                                             mStride);
  69     Init(surface);
  70 }
  71
  72 gfxImageSurface::gfxImageSurface(cairo_surface_t *csurf)
  73 {
  74     mSize.width = cairo_image_surface_get_width(csurf);
  75     mSize.height = cairo_image_surface_get_height(csurf);
  76     mData = cairo_image_surface_get_data(csurf);
  77     mFormat = (gfxImageFormat) cairo_image_surface_get_format(csurf);
  78     mOwnsData = PR_FALSE;
  79     mStride = cairo_image_surface_get_stride(csurf);
  80
  81     Init(csurf, PR_TRUE);
  82 }
  83
  84 gfxImageSurface::~gfxImageSurface()
  85 {
  86     if (!mSurfaceValid)
  87         return;
  88
  89     if (mOwnsData) {
  90         free(mData);
  91         mData = nsnull;
  92     }
  93 }
  94
  95 long
  96 gfxImageSurface::ComputeStride() const
  97 {
  98     long stride;
  99
 100     if (mFormat == ImageFormatARGB32)
 101         stride = mSize.width * 4;
 102     else if (mFormat == ImageFormatRGB24)
 103         stride = mSize.width * 4;
 104     else if (mFormat == ImageFormatA8)
 105         stride = mSize.width;
 106     else if (mFormat == ImageFormatA1) {
 107         stride = (mSize.width + 7) / 8;
 108     } else {
 109         NS_WARNING("Unknown format specified to gfxImageSurface!");
 110         stride = mSize.width * 4;
 111     }
 112
 113     stride = ((stride + 3) / 4) * 4;
 114
 115     return stride;
 116 }
 117
 118 PRBool
 119 gfxImageSurface::CopyFrom(gfxImageSurface *other)
 120 {
 121     if (other->mSize != mSize)
 122     {
 123         return PR_FALSE;
 124     }
 125
 126     if (other->mFormat != mFormat &&
 127         !(other->mFormat == ImageFormatARGB32 && mFormat == ImageFormatRGB24) &&
 128         !(other->mFormat == ImageFormatRGB24 && mFormat == ImageFormatARGB32))
 129     {
 130         return PR_FALSE;
 131     }
 132
 133     if (other->mStride == mStride) {
 134         memcpy (mData, other->mData, mStride * mSize.height);
 135     } else {
 136         int lineSize = PR_MIN(other->mStride, mStride);
 137         for (int i = 0; i < mSize.height; i++) {
 138             unsigned char *src = other->mData + other->mStride * i;
 139             unsigned char *dst = mData + mStride * i;
 140
 141             memcpy (dst, src, lineSize);
 142         }
 143     }
 144
 145     return PR_TRUE;
 146 }