/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the Collabora Office 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/.
 */

#ifndef INCLUDED_VCL_BITMAP_TOOLS_HXX
#define INCLUDED_VCL_BITMAP_TOOLS_HXX

#include <config_wasm_strip.h>

#include <vcl/bitmap.hxx>
#include <vcl/ImageTree.hxx>
#include <vcl/Scanline.hxx>
#include <basegfx/range/b2drectangle.hxx>
#include <array>
#include <optional>
#include <vcl/RawBitmap.hxx>

class SvStream;
namespace basegfx { class B2DHomMatrix; }
namespace com::sun::star::geometry { struct IntegerRectangle2D; }

namespace vcl::bitmap {

#if !ENABLE_WASM_STRIP_PREMULTIPLY
typedef std::array<std::array<sal_uInt8, 256>, 256> lookup_table;

lookup_table const & get_premultiply_table();
VCL_DLLPUBLIC lookup_table const & get_unpremultiply_table();
#endif

VCL_DLLPUBLIC sal_uInt8 unpremultiply(sal_uInt8 c, sal_uInt8 a);
VCL_DLLPUBLIC sal_uInt8 premultiply(sal_uInt8 c, sal_uInt8 a);

/** Byte offsets channels within a 4-byte pixel. */
struct ScanlineChannelOffsets
{
    sal_uInt8 nBlue;
    sal_uInt8 nGreen;
    sal_uInt8 nRed;
    sal_uInt8 nAlpha;
};

/** For a premultiplied 32-bit truecolor scanline format (ABGR/ARGB/BGRA/RGBA), return the byte offsets */
VCL_DLLPUBLIC std::optional<ScanlineChannelOffsets>
get32BitTcChannelOffsets(ScanlineFormat eFormat);

Bitmap VCL_DLLPUBLIC loadFromName(const OUString& rFileName, const ImageLoadFlags eFlags = ImageLoadFlags::NONE);

void loadFromSvg(SvStream& rStream, const OUString& sPath, Bitmap& rBitmap, double fScaleFactor);

/** Copy block of image data into the bitmap.
    Assumes that the Bitmap has been constructed with the desired size.

    @param pData
    The block of data to copy
    @param nStride
    The number of bytes in a scanline, must be >= (width * bitcount / 8)
*/
Bitmap VCL_DLLPUBLIC CreateFromData(sal_uInt8 const *pData,
                                      sal_Int32 nWidth, sal_Int32 nHeight, sal_Int32 nStride,
                                      sal_Int8 nBitsPerPixel,
                                      bool bReversColors = false, bool bReverseAlpha = false);

void VCL_DLLPUBLIC fillWithData(sal_uInt8* pData, Bitmap const& rBitmap);

Bitmap VCL_DLLPUBLIC CreateFromData( RawBitmap && data );

VCL_DLLPUBLIC ::Bitmap CanvasTransformBitmap( const ::Bitmap& rBitmap,
                                  const ::basegfx::B2DHomMatrix&  rTransform,
                                  ::basegfx::B2DRectangle const & rDestRect,
                                  ::basegfx::B2DHomMatrix const & rLocalTransform );

VCL_DLLPUBLIC void DrawAlphaBitmapAndAlphaGradient(Bitmap & rBitmap, bool bFixedTransparence, float fTransparence, const AlphaMask & rNewMask);

VCL_DLLPUBLIC void DrawAndClipBitmap(const Point& rPos, const Size& rSize, const Bitmap& rBitmap, Bitmap & aBmp, basegfx::B2DPolyPolygon const & rClipPath);

VCL_DLLPUBLIC cpo::uno::Sequence< sal_Int8 > GetMaskDIB(Bitmap const & aBmp);

VCL_DLLPUBLIC cpo::uno::Sequence< sal_Int8 > CanvasExtractBitmapData(Bitmap const & rBitmap, const css::geometry::IntegerRectangle2D& rect);

// helper to construct historical 8x8 bitmaps with two colors

Bitmap VCL_DLLPUBLIC createHistorical8x8FromArray(std::array<sal_uInt8,64> const & pArray, Color aColorPix, Color aColorBack);
bool VCL_DLLPUBLIC isHistorical8x8(const Bitmap& rBitmap, Color& o_rBack, Color& o_rFront);

/** Retrieve downsampled and cropped bitmap

    Takes destination size in twips units.

    @attention This method ignores negative rDstSz values, thus
    mirroring must happen outside this method (e.g. in DrawBitmap)
 */
VCL_DLLPUBLIC Bitmap GetDownsampledBitmap(Size const& rDstSizeTwip, Point const& rSrcPt, Size const& rSrcSz,
                            Bitmap const& rBmp, tools::Long nMaxBmpDPIX, tools::Long nMaxBmpDPIY);

BitmapColor premultiply(const BitmapColor c);
BitmapColor unpremultiply(const BitmapColor c);

} // end vcl::bitmap

#endif // INCLUDED_VCL_BITMAP_TOOLS_HXX

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