Caolán McNamara
aa5c21e8b1
so pixels that a reader never writes, for example when it stops a row early, are black rather than arbitrary noise Signed-off-by: Caolán McNamara <caolan.mcnamara@collabora.com> Change-Id: I8e7133427b43447875869d23958dfb4316c4e178 Reviewed-on: https://gerrit.collaboraoffice.com/c/online/+/13725 Tested-by: Jenkins CPCI <releng@collaboraoffice.com> Reviewed-by: Noel Grandin <noel.grandin@collabora.com> (cherry picked from commit b509e99e049d330950edeac35702735fd22245ab) Reviewed-on: https://gerrit.libreoffice.org/c/core/+/211562 Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org> Tested-by: Jenkins
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include <o3tl/safeint.hxx>
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#include <tools/gen.hxx>
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#include <tools/long.hxx>
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#include <vcl/BitmapColor.hxx>
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class Bitmap;
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namespace vcl::bitmap
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{
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/**
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* Intended to be used to feed into CreateFromData to create a Bitmap. RGB data format.
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*/
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class VCL_DLLPUBLIC RawBitmap
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{
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friend Bitmap VCL_DLLPUBLIC CreateFromData(RawBitmap&& rawBitmap);
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std::unique_ptr<sal_uInt8[]> mpData;
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Size maSize;
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sal_uInt8 mnBitCount;
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public:
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RawBitmap(Size const& rSize, sal_uInt8 nBitCount)
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: maSize(rSize)
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, mnBitCount(nBitCount)
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{
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assert(nBitCount == 24 || nBitCount == 32);
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if (rSize.getWidth() > std::numeric_limits<sal_Int32>::max() || rSize.getWidth() < 0)
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throw std::bad_alloc();
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if (rSize.getHeight() > std::numeric_limits<sal_Int32>::max() || rSize.getHeight() < 0)
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throw std::bad_alloc();
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sal_Int32 nRowSize, nDataSize;
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if (o3tl::checked_multiply<sal_Int32>(rSize.getWidth(), nBitCount / 8, nRowSize)
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|| o3tl::checked_multiply<sal_Int32>(nRowSize, rSize.getHeight(), nDataSize)
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|| nDataSize < 0)
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{
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throw std::bad_alloc();
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}
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mpData.reset(new sal_uInt8[nDataSize]());
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}
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void SetPixel(tools::Long nY, tools::Long nX, Color nColor)
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{
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tools::Long p = (nY * maSize.getWidth() + nX) * (mnBitCount / 8);
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mpData[p++] = nColor.GetRed();
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mpData[p++] = nColor.GetGreen();
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mpData[p++] = nColor.GetBlue();
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if (mnBitCount == 32)
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mpData[p] = nColor.GetAlpha();
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}
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void SetAlpha(tools::Long nY, tools::Long nX, sal_uInt8 nAlpha)
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{
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assert(mnBitCount == 32);
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tools::Long p = (nY * maSize.getWidth() + nX) * (mnBitCount / 8) + 3;
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mpData[p] = nAlpha;
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}
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Color GetPixel(tools::Long nY, tools::Long nX) const
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{
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tools::Long p = (nY * maSize.getWidth() + nX) * mnBitCount / 8;
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if (mnBitCount == 24)
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return Color(mpData[p], mpData[p + 1], mpData[p + 2]);
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else
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return Color(ColorAlpha, mpData[p + 3], mpData[p], mpData[p + 1], mpData[p + 2]);
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}
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// so we don't accidentally leave any code in that uses palette color indexes
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void SetPixel(tools::Long nY, tools::Long nX, BitmapColor nColor) = delete;
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tools::Long Height() const { return maSize.Height(); }
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tools::Long Width() const { return maSize.Width(); }
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sal_uInt8 GetBitCount() const { return mnBitCount; }
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};
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} // end vcl::bitmap
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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