105 lines
3.4 KiB
C++
105 lines
3.4 KiB
C++
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/**************************************************************************\
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*
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* Copyright (c) 1999-2000 Microsoft Corporation
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*
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* Module Name:
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*
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* Scan operations
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*
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* Abstract:
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*
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* Public scan-operation definitions (in the ScanOperation namespace).
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* See Gdiplus\Specs\ScanOperation.doc for an overview.
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*
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* Created:
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*
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* 07/16/1999 agodfrey
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*
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\**************************************************************************/
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#ifndef _SCANOPERATION_HPP
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#define _SCANOPERATION_HPP
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#include "palettemap.hpp"
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namespace ScanOperation
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{
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// OtherParams:
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// If a scan operation needs extra information about how to perform
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// an operation, it is passed in the OtherParams structure.
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struct OtherParams
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{
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const ColorPalette* Srcpal; // source palette
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const ColorPalette* Dstpal; // destination palette
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const EpPaletteMap *PaletteMap; // palette translation vector, used when
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// halftoning
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INT X,Y; // x and y coordinates of the leftmost pixel of the scan.
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// Used when halftoning/dithering
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BOOL DoingDither; // dithering enabled (for 16bpp)
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BYTE *CTBuffer; // ClearType coverage buffer, used for ClearType
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// scan types.
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ARGB SolidColor; // Solid fill color, used in the OpaqueSolidFill and
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// CTSolidFill scan types.
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ULONG TextContrast; // Text contrast value for blending, used in CTFill and CTSolidFill types
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// blendingScan: Used in the RMW optimization (see ReadRMW and
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// WriteRMW). Can be in either ARGB or ARGB64 format.
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const void *BlendingScan;
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void *TempBuffers[3];
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};
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/**************************************************************************\
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*
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* Operation Description:
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*
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* ScanOpFunc is the signature of every Scan Operation.
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*
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* Arguments:
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*
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* dst - The destination scan
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* src - The source scan
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* count - The length of the scan, in pixels
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* otherParams - Additional data.
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*
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* Return Value:
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*
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* None
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*
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* Notes:
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*
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* The formats of the destination and source depend on the specific
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* scan operation.
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*
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* dst and src must point to non-overlapping buffers. The one exception
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* is that they may be equal, but some scan operations don't allow this
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* (most notably, those which deal with different-sized source and
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* destination formats.)
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*
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* If you know which operations you're going to be invoking, you can
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* omit to set fields in otherParams, trusting that they won't be
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* used. This can be error-prone, which is why we try to limit
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* the code which uses scan operations directly.
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* As an example, if you know you're not going to deal with palettized
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* formats, you don't need to set up Srcpal, Dstpal or PaletteMap.
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*
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\**************************************************************************/
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// The common scan operation function signature
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typedef VOID (FASTCALL *ScanOpFunc)(
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VOID *dst,
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const VOID *src,
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INT count,
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const OtherParams *otherParams
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);
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};
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#endif
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