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.
  16  *
  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>
  23  *
  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(unsigned char *aData, const gfxIntSize& aSize,
  45                                  long aStride, gfxImageFormat aFormat)
  46   : mSize(aSize)
  47   , mOwnsData(PR_FALSE)
  48   , mData(aData)
  49   , mFormat(aFormat)
  50   , mStride(aStride)
  51 {
  52     if (!CheckSurfaceSize(aSize))
  53         return;
  54
  55     cairo_surface_t *surface =
  56         cairo_image_surface_create_for_data((unsigned char*)mData,
  57                                             (cairo_format_t)mFormat,
  58                                             mSize.width,
  59                                             mSize.height,
  60                                             mStride);
  61
  62     // cairo_image_surface_create_for_data can return a 'null' surface
  63     // in out of memory conditions. The gfxASurface::Init call checks
  64     // the surface it receives to see if there is an error with the
  65     // surface and handles it appropriately. That is why there is
  66     // no check here.
  67     Init(surface);
  68 }
  69
  70 gfxImageSurface::gfxImageSurface(const gfxIntSize& size, gfxImageFormat format) :
  71     mSize(size), mOwnsData(PR_FALSE), mFormat(format)
  72 {
  73     mStride = ComputeStride();
  74
  75     if (!CheckSurfaceSize(size))
  76         return;
  77
  78     // if we have a zero-sized surface, just set mData to nsnull
  79     if (mSize.height * mStride > 0) {
  80         mData = (unsigned char *) calloc(mSize.height, mStride);
  81         if (!mData)
  82             return;
  83     } else {
  84         mData = nsnull;
  85     }
  86
  87     mOwnsData = PR_TRUE;
  88
  89     cairo_surface_t *surface =
  90         cairo_image_surface_create_for_data((unsigned char*)mData,
  91                                             (cairo_format_t)format,
  92                                             mSize.width,
  93                                             mSize.height,
  94                                             mStride);
  95     Init(surface);
  96 }
  97
  98 gfxImageSurface::gfxImageSurface(cairo_surface_t *csurf)
  99 {
 100     mSize.width = cairo_image_surface_get_width(csurf);
 101     mSize.height = cairo_image_surface_get_height(csurf);
 102     mData = cairo_image_surface_get_data(csurf);
 103     mFormat = (gfxImageFormat) cairo_image_surface_get_format(csurf);
 104     mOwnsData = PR_FALSE;
 105     mStride = cairo_image_surface_get_stride(csurf);
 106
 107     Init(csurf, PR_TRUE);
 108 }
 109
 110 gfxImageSurface::~gfxImageSurface()
 111 {
 112     if (mOwnsData)
 113         free(mData);
 114 }
 115
 116 long
 117 gfxImageSurface::ComputeStride() const
 118 {
 119     long stride;
 120
 121     if (mFormat == ImageFormatARGB32)
 122         stride = mSize.width * 4;
 123     else if (mFormat == ImageFormatRGB24)
 124         stride = mSize.width * 4;
 125     else if (mFormat == ImageFormatA8)
 126         stride = mSize.width;
 127     else if (mFormat == ImageFormatA1) {
 128         stride = (mSize.width + 7) / 8;
 129     } else {
 130         NS_WARNING("Unknown format specified to gfxImageSurface!");
 131         stride = mSize.width * 4;
 132     }
 133
 134     stride = ((stride + 3) / 4) * 4;
 135
 136     return stride;
 137 }
 138
 139 PRBool
 140 gfxImageSurface::CopyFrom(gfxImageSurface *other)
 141 {
 142     if (other->mSize != mSize)
 143     {
 144         return PR_FALSE;
 145     }
 146
 147     if (other->mFormat != mFormat &&
 148         !(other->mFormat == ImageFormatARGB32 && mFormat == ImageFormatRGB24) &&
 149         !(other->mFormat == ImageFormatRGB24 && mFormat == ImageFormatARGB32))
 150     {
 151         return PR_FALSE;
 152     }
 153
 154     if (other->mStride == mStride) {
 155         memcpy (mData, other->mData, mStride * mSize.height);
 156     } else {
 157         int lineSize = PR_MIN(other->mStride, mStride);
 158         for (int i = 0; i < mSize.height; i++) {
 159             unsigned char *src = other->mData + other->mStride * i;
 160             unsigned char *dst = mData + mStride * i;
 161
 162             memcpy (dst, src, lineSize);
 163         }
 164     }
 165
 166     return PR_TRUE;
 167 }