Karthik
b7b2913bdc
Since BitmapEx was unified into a single premultiplied 32-bit BGRA Bitmap, converting such a bitmap runs a per-pixel loop that builds a BitmapColor and dispatches through the `GetPixelFromData` / `SetPixelOnData`, (un)premultiplying one channel at a time. Add a fast scanline path for the common case, a premultiplied 32-bit truecolor bitmap (ABGR/ARGB/BGRA/RGBA). It resolves each channel's byte offset once and then moves the scanline bytes directly, using the premultiply / unpremultiply lookup tables. Signed-off-by: Karthik <karthik.godha@collabora.com> Change-Id: Ie8ee47055bdffca9e06d48955fdc0b61b34e08ac Reviewed-on: https://gerrit.collaboraoffice.com/c/online/+/6752 Reviewed-by: Michael Stahl <michael.stahl@collabora.com> Tested-by: Jenkins CPCI <releng@collaboraoffice.com> (cherry picked from commit 54c68922eaa2d2c4e20e10091ad4911e8d32aed2) Reviewed-on: https://gerrit.libreoffice.org/c/core/+/208641 Tested-by: Jenkins
129 lines
4.8 KiB
C++
129 lines
4.8 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 <config_cairo_canvas.h>
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#include <config_wasm_strip.h>
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#include <tools/long.hxx>
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#include <vcl/ImageTree.hxx>
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#if ENABLE_CAIRO_CANVAS
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#include <vcl/cairo.hxx>
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#endif
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#include <vcl/Scanline.hxx>
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#include <basegfx/range/b2drectangle.hxx>
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#include <array>
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#include <optional>
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class AlphaMask;
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class BitmapColor;
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class Color;
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class Point;
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class Size;
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class SvStream;
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namespace basegfx { class B2DHomMatrix; }
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namespace basegfx { class B2DPolyPolygon; }
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namespace com::sun::star::geometry { struct IntegerRectangle2D; }
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namespace com::sun::star::uno { template <class E> class Sequence; }
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namespace vcl::bitmap { class RawBitmap; }
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namespace vcl::bitmap {
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#if !ENABLE_WASM_STRIP_PREMULTIPLY
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typedef std::array<std::array<sal_uInt8, 256>, 256> lookup_table;
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lookup_table const & get_premultiply_table();
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VCL_DLLPUBLIC lookup_table const & get_unpremultiply_table();
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#endif
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VCL_DLLPUBLIC sal_uInt8 unpremultiply(sal_uInt8 c, sal_uInt8 a);
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VCL_DLLPUBLIC sal_uInt8 premultiply(sal_uInt8 c, sal_uInt8 a);
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/** Byte offsets channels within a 4-byte pixel. */
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struct ScanlineChannelOffsets
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{
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sal_uInt8 nBlue;
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sal_uInt8 nGreen;
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sal_uInt8 nRed;
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sal_uInt8 nAlpha;
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};
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/** For a premultiplied 32-bit truecolor scanline format (ABGR/ARGB/BGRA/RGBA), return the byte offsets */
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VCL_DLLPUBLIC std::optional<ScanlineChannelOffsets>
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get32BitTcChannelOffsets(ScanlineFormat eFormat);
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Bitmap VCL_DLLPUBLIC loadFromName(const OUString& rFileName, const ImageLoadFlags eFlags = ImageLoadFlags::NONE);
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void loadFromSvg(SvStream& rStream, const OUString& sPath, Bitmap& rBitmap, double fScaleFactor);
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/** Copy block of image data into the bitmap.
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Assumes that the Bitmap has been constructed with the desired size.
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@param pData
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The block of data to copy
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@param nStride
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The number of bytes in a scanline, must be >= (width * bitcount / 8)
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*/
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Bitmap VCL_DLLPUBLIC CreateFromData(sal_uInt8 const *pData,
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sal_Int32 nWidth, sal_Int32 nHeight, sal_Int32 nStride,
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sal_Int8 nBitsPerPixel,
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bool bReversColors = false, bool bReverseAlpha = false);
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#if defined(_WIN32) && !USE_HEADLESS_CODE
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void VCL_DLLPUBLIC fillWithData(sal_uInt8* pData, Bitmap const& rBitmap);
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#endif
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Bitmap VCL_DLLPUBLIC CreateFromData( RawBitmap && data );
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#if ENABLE_CAIRO_CANVAS
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VCL_DLLPUBLIC Bitmap CreateFromCairoSurface(Size size, cairo_surface_t* pSurface);
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#endif
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VCL_DLLPUBLIC ::Bitmap CanvasTransformBitmap( const ::Bitmap& rBitmap,
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const ::basegfx::B2DHomMatrix& rTransform,
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::basegfx::B2DRectangle const & rDestRect,
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::basegfx::B2DHomMatrix const & rLocalTransform );
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VCL_DLLPUBLIC void DrawAlphaBitmapAndAlphaGradient(Bitmap & rBitmap, bool bFixedTransparence, float fTransparence, const AlphaMask & rNewMask);
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VCL_DLLPUBLIC void DrawAndClipBitmap(const Point& rPos, const Size& rSize, const Bitmap& rBitmap, Bitmap & aBmp, basegfx::B2DPolyPolygon const & rClipPath);
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VCL_DLLPUBLIC css::uno::Sequence< sal_Int8 > GetMaskDIB(Bitmap const & aBmp);
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/**
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* @param data will be filled with alpha data, if xBitmap is alpha/transparent image
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* @param bHasAlpha will be set to true if resulting surface has alpha
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**/
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VCL_DLLPUBLIC void CanvasCairoExtractBitmapData( Bitmap const & rBitmap, unsigned char*& data, bool& bHasAlpha, tools::Long& rnWidth, tools::Long& rnHeight );
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VCL_DLLPUBLIC css::uno::Sequence< sal_Int8 > CanvasExtractBitmapData(Bitmap const & rBitmap, const css::geometry::IntegerRectangle2D& rect);
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// helper to construct historical 8x8 bitmaps with two colors
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Bitmap VCL_DLLPUBLIC createHistorical8x8FromArray(std::array<sal_uInt8,64> const & pArray, Color aColorPix, Color aColorBack);
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bool VCL_DLLPUBLIC isHistorical8x8(const Bitmap& rBitmap, Color& o_rBack, Color& o_rFront);
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/** Retrieve downsampled and cropped bitmap
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Takes destination size in twips units.
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@attention This method ignores negative rDstSz values, thus
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mirroring must happen outside this method (e.g. in DrawBitmap)
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*/
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VCL_DLLPUBLIC Bitmap GetDownsampledBitmap(Size const& rDstSizeTwip, Point const& rSrcPt, Size const& rSrcSz,
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Bitmap const& rBmp, tools::Long nMaxBmpDPIX, tools::Long nMaxBmpDPIY);
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BitmapColor premultiply(const BitmapColor c);
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BitmapColor unpremultiply(const BitmapColor c);
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} // end vcl::bitmap
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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