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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 :
21 : #include "bitmapbackbuffer.hxx"
22 :
23 : #include <osl/mutex.hxx>
24 :
25 : #include <vcl/svapp.hxx>
26 : #include <vcl/bitmapex.hxx>
27 : #include <vcl/bmpacc.hxx>
28 :
29 :
30 : namespace vclcanvas
31 : {
32 0 : BitmapBackBuffer::BitmapBackBuffer( const BitmapEx& rBitmap,
33 : const OutputDevice& rRefDevice ) :
34 : maBitmap( rBitmap ),
35 : mpVDev( NULL ),
36 : mrRefDevice( rRefDevice ),
37 : mbBitmapContentIsCurrent( false ),
38 0 : mbVDevContentIsCurrent( false )
39 : {
40 0 : }
41 :
42 0 : BitmapBackBuffer::~BitmapBackBuffer()
43 : {
44 : // make sure solar mutex is held on deletion (other methods
45 : // are supposed to be called with already locked solar mutex)
46 0 : SolarMutexGuard aGuard;
47 :
48 0 : if( mpVDev )
49 0 : delete mpVDev;
50 0 : }
51 :
52 0 : OutputDevice& BitmapBackBuffer::getOutDev()
53 : {
54 0 : createVDev();
55 0 : updateVDev();
56 0 : return *mpVDev;
57 : }
58 :
59 0 : const OutputDevice& BitmapBackBuffer::getOutDev() const
60 : {
61 0 : createVDev();
62 0 : updateVDev();
63 0 : return *mpVDev;
64 : }
65 :
66 0 : void BitmapBackBuffer::clear()
67 : {
68 : // force current content to bitmap, make all transparent white
69 0 : getBitmapReference().Erase(COL_TRANSPARENT);
70 0 : }
71 :
72 0 : BitmapEx& BitmapBackBuffer::getBitmapReference()
73 : {
74 : OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent,
75 : "BitmapBackBuffer::getBitmapReference(): Both bitmap and VDev are valid?!" );
76 :
77 0 : if( mbVDevContentIsCurrent && mpVDev )
78 : {
79 : // VDev content is more current than bitmap - copy contents before!
80 0 : mpVDev->EnableMapMode( sal_False );
81 0 : const Point aEmptyPoint;
82 0 : *maBitmap = mpVDev->GetBitmapEx( aEmptyPoint,
83 0 : mpVDev->GetOutputSizePixel() );
84 : }
85 :
86 : // client queries bitmap, and will possibly alter content -
87 : // next time, VDev needs to be updated
88 0 : mbBitmapContentIsCurrent = true;
89 0 : mbVDevContentIsCurrent = false;
90 :
91 0 : return *maBitmap;
92 : }
93 :
94 0 : Size BitmapBackBuffer::getBitmapSizePixel() const
95 : {
96 0 : Size aSize = maBitmap->GetSizePixel();
97 :
98 0 : if( mbVDevContentIsCurrent && mpVDev )
99 : {
100 0 : mpVDev->EnableMapMode( sal_False );
101 0 : aSize = mpVDev->GetOutputSizePixel();
102 : }
103 :
104 0 : return aSize;
105 : }
106 :
107 0 : void BitmapBackBuffer::createVDev() const
108 : {
109 0 : if( !mpVDev )
110 : {
111 : // VDev not yet created, do it now. Create an alpha-VDev,
112 : // if bitmap has transparency.
113 0 : mpVDev = maBitmap->IsTransparent() ?
114 0 : new VirtualDevice( mrRefDevice, 0, 0 ) :
115 0 : new VirtualDevice( mrRefDevice );
116 :
117 : OSL_ENSURE( mpVDev,
118 : "BitmapBackBuffer::createVDev(): Unable to create VirtualDevice" );
119 :
120 0 : mpVDev->SetOutputSizePixel( maBitmap->GetSizePixel() );
121 :
122 : // #i95645#
123 : #if defined( QUARTZ )
124 : // use AA on VCLCanvas for Mac
125 : mpVDev->SetAntialiasing( ANTIALIASING_ENABLE_B2DDRAW | mpVDev->GetAntialiasing() );
126 : #else
127 : // switch off AA for WIN32 and UNIX, the VCLCanvas does not look good with it and
128 : // is not required to do AA. It would need to be adapted to use it correctly
129 : // (especially gradient painting). This will need extra work.
130 0 : mpVDev->SetAntialiasing(mpVDev->GetAntialiasing() & ~ANTIALIASING_ENABLE_B2DDRAW);
131 : #endif
132 : }
133 0 : }
134 :
135 0 : void BitmapBackBuffer::updateVDev() const
136 : {
137 : OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent,
138 : "BitmapBackBuffer::updateVDev(): Both bitmap and VDev are valid?!" );
139 :
140 0 : if( mpVDev && mbBitmapContentIsCurrent )
141 : {
142 : // fill with bitmap content
143 0 : mpVDev->EnableMapMode( sal_False );
144 0 : const Point aEmptyPoint;
145 0 : mpVDev->DrawBitmapEx( aEmptyPoint, *maBitmap );
146 : }
147 :
148 : // canvas queried the VDev, and will possibly paint into
149 : // it. Next time, bitmap must be updated
150 0 : mbBitmapContentIsCurrent = false;
151 0 : mbVDevContentIsCurrent = true;
152 0 : }
153 : }
154 :
155 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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