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/**************************************************************************
*
* Copyright � Microsoft Corporation
*
* File Title: WiaUtil.h
*
* Project: Production Scanning Driver Sample
*
* Description: This file contains various helper functions for the driver.
*
***************************************************************************/
#pragma once
HRESULT
MakeFullItemName(
_In_ IWiaDrvItem* pParent,
_In_ BSTR bstrItemName,
_Out_ BSTR* pbstrFullItemName);
HRESULT
CreateWIAChildItem(
_In_ LPOLESTR pszItemName,
_In_ IWiaMiniDrv *pIWiaMiniDrv,
_In_ IWiaDrvItem *pParent,
LONG lItemFlags,
GUID guidItemCategory,
_Inout_opt_ IWiaDrvItem **ppChild = NULL);
HRESULT
wiasGetDriverItemPrivateContext(
_In_ BYTE* pWiasContext,
_Out_ BYTE** ppWiaDriverItemContext);
HRESULT AllocateTransferBuffer(
_Outptr_result_bytebuffer_(*pulBufferSize) BYTE** ppBuffer,
_Out_ ULONG* pulBufferSize);
void
FreeTransferBuffer(
_In_opt_ BYTE* pBuffer);
void
QueueWIAEvent(
_In_ BYTE* pWiasContext,
const GUID& guidWIAEvent);
inline LONG
BytesPerLine(
LONG lImageWidth,
LONG lBitDepth)
{
//
// The number of bytes per line include the padding necessary to make each uncompressed
// line (DIB or Raw) DWORD aligned. When the image data is compressed the number of bytes
// per line calculated here describes the original uncompressed image:
//
return (((lImageWidth * lBitDepth) + 31) / 32) * 4;
};
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