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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
commit | ed5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch) | |
tree | 7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /canvas/source/vcl/bitmapbackbuffer.cxx | |
parent | Initial commit. (diff) | |
download | libreoffice-upstream.tar.xz libreoffice-upstream.zip |
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | canvas/source/vcl/bitmapbackbuffer.cxx | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/canvas/source/vcl/bitmapbackbuffer.cxx b/canvas/source/vcl/bitmapbackbuffer.cxx new file mode 100644 index 000000000..d6f87e3c0 --- /dev/null +++ b/canvas/source/vcl/bitmapbackbuffer.cxx @@ -0,0 +1,147 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <sal/config.h> + +#include <osl/diagnose.h> +#include <vcl/bitmapex.hxx> +#include <vcl/svapp.hxx> + +#include "bitmapbackbuffer.hxx" +#include "impltools.hxx" + +namespace vclcanvas +{ + BitmapBackBuffer::BitmapBackBuffer( const BitmapEx& rBitmap, + const OutputDevice& rRefDevice ) : + maBitmap( rBitmap ), + mpVDev( nullptr ), + mrRefDevice( rRefDevice ), + mbBitmapContentIsCurrent( false ), + mbVDevContentIsCurrent( false ) + { + } + + BitmapBackBuffer::~BitmapBackBuffer() + { + // make sure solar mutex is held on deletion (other methods + // are supposed to be called with already locked solar mutex) + SolarMutexGuard aGuard; + + mpVDev.disposeAndClear(); + } + + OutputDevice& BitmapBackBuffer::getOutDev() + { + createVDev(); + updateVDev(); + return *mpVDev; + } + + const OutputDevice& BitmapBackBuffer::getOutDev() const + { + createVDev(); + updateVDev(); + return *mpVDev; + } + + void BitmapBackBuffer::clear() + { + // force current content to bitmap, make all transparent white + getBitmapReference().Erase(COL_TRANSPARENT); + } + + BitmapEx& BitmapBackBuffer::getBitmapReference() + { + OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent, + "BitmapBackBuffer::getBitmapReference(): Both bitmap and VDev are valid?!" ); + + if( mbVDevContentIsCurrent && mpVDev ) + { + // VDev content is more current than bitmap - copy contents before! + mpVDev->EnableMapMode( false ); + mpVDev->SetAntialiasing( AntialiasingFlags::Enable ); + const Point aEmptyPoint; + *maBitmap = mpVDev->GetBitmapEx( aEmptyPoint, + mpVDev->GetOutputSizePixel() ); + } + + // client queries bitmap, and will possibly alter content - + // next time, VDev needs to be updated + mbBitmapContentIsCurrent = true; + mbVDevContentIsCurrent = false; + + return *maBitmap; + } + + Size BitmapBackBuffer::getBitmapSizePixel() const + { + Size aSize = maBitmap->GetSizePixel(); + + if( mbVDevContentIsCurrent && mpVDev ) + { + mpVDev->EnableMapMode( false ); + mpVDev->SetAntialiasing( AntialiasingFlags::Enable ); + aSize = mpVDev->GetOutputSizePixel(); + } + + return aSize; + } + + void BitmapBackBuffer::createVDev() const + { + if( mpVDev ) + return; + + // VDev not yet created, do it now. Create an alpha-VDev, + // if bitmap has transparency. + mpVDev = maBitmap->IsAlpha() ? + VclPtr<VirtualDevice>::Create( mrRefDevice, DeviceFormat::DEFAULT, DeviceFormat::DEFAULT ) : + VclPtr<VirtualDevice>::Create( mrRefDevice ); + + OSL_ENSURE( mpVDev, + "BitmapBackBuffer::createVDev(): Unable to create VirtualDevice" ); + + mpVDev->SetOutputSizePixel( maBitmap->GetSizePixel() ); + + tools::SetDefaultDeviceAntiAliasing( mpVDev ); + } + + void BitmapBackBuffer::updateVDev() const + { + OSL_ENSURE( !mbBitmapContentIsCurrent || !mbVDevContentIsCurrent, + "BitmapBackBuffer::updateVDev(): Both bitmap and VDev are valid?!" ); + + if( mpVDev && mbBitmapContentIsCurrent ) + { + // fill with bitmap content + mpVDev->EnableMapMode( false ); + mpVDev->SetAntialiasing( AntialiasingFlags::Enable ); + const Point aEmptyPoint; + mpVDev->DrawBitmapEx( aEmptyPoint, *maBitmap ); + } + + // canvas queried the VDev, and will possibly paint into + // it. Next time, bitmap must be updated + mbBitmapContentIsCurrent = false; + mbVDevContentIsCurrent = true; + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |