160 lines
3.8 KiB
C++
160 lines
3.8 KiB
C++
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//+----------------------------------------------------------------------------
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//
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// File: himetric.cpp
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//
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// Module: Connection Manager
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//
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// Synopsis: Routines to convert Pixels to Himetric and vice versa
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//
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// Copyright (c) 1998 Microsoft Corporation
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//
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// Author: nickball Created 02/10/98
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//
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//+----------------------------------------------------------------------------
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#include "cmmaster.h"
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#pragma hdrstop
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#define HIMETRIC_PER_INCH 2540L
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SIZE g_sizePixelsPerInch;
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//+------------------------------------------------------------------------
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//
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// Function: InitPixelsPerInch
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//
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// Synopsis: Initializing coordinate mapping for screen pixels
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//
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// Returns: HRESULT; S_OK on success, E_OUTOFMEMORY otherwise
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//
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//-------------------------------------------------------------------------
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void
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InitPixelsPerInch(VOID)
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{
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HDC hdc;
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hdc = GetDC(NULL);
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if (!hdc)
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goto Error;
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g_sizePixelsPerInch.cx = GetDeviceCaps(hdc, LOGPIXELSX);
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g_sizePixelsPerInch.cy = GetDeviceCaps(hdc, LOGPIXELSY);
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ReleaseDC(NULL, hdc);
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Cleanup:
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return;
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Error:
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g_sizePixelsPerInch.cx = 96;
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g_sizePixelsPerInch.cy = 96;
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goto Cleanup;
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}
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//+---------------------------------------------------------------
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//
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// Function: HimetricFromHPix
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//
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// Synopsis: Converts horizontal pixel units to himetric units.
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//
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//----------------------------------------------------------------
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long
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HimetricFromHPix(int iPix)
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{
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if (!g_sizePixelsPerInch.cx)
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InitPixelsPerInch();
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return MulDiv(iPix, HIMETRIC_PER_INCH, g_sizePixelsPerInch.cx);
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}
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//+---------------------------------------------------------------
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//
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// Function: HimetricFromVPix
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//
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// Synopsis: Converts vertical pixel units to himetric units.
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//
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//----------------------------------------------------------------
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long
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HimetricFromVPix(int iPix)
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{
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if (!g_sizePixelsPerInch.cy)
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InitPixelsPerInch();
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return MulDiv(iPix, HIMETRIC_PER_INCH, g_sizePixelsPerInch.cy);
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}
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//+---------------------------------------------------------------
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//
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// Function: HPixFromHimetric
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//
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// Synopsis: Converts himetric units to horizontal pixel units.
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//
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//----------------------------------------------------------------
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int
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HPixFromHimetric(long lHi)
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{
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if (!g_sizePixelsPerInch.cx)
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InitPixelsPerInch();
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return MulDiv(g_sizePixelsPerInch.cx, lHi, HIMETRIC_PER_INCH);
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}
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//+---------------------------------------------------------------
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//
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// Function: VPixFromHimetric
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//
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// Synopsis: Converts himetric units to vertical pixel units.
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//
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//----------------------------------------------------------------
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int
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VPixFromHimetric(long lHi)
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{
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if (!g_sizePixelsPerInch.cy)
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InitPixelsPerInch();
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return MulDiv(g_sizePixelsPerInch.cy, lHi, HIMETRIC_PER_INCH);
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}
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//+---------------------------------------------------------------------------
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//
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// Function: PixelFromHMRect
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//
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// Synopsis: Converts a Himetric RECTL to a Pixel RECT
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//
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//----------------------------------------------------------------------------
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void
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PixelFromHMRect(RECT *prcDest, RECTL *prcSrc)
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{
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prcDest->left = HPixFromHimetric(prcSrc->left);
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prcDest->top = VPixFromHimetric(prcSrc->top);
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prcDest->right = HPixFromHimetric(prcSrc->right);
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prcDest->bottom = VPixFromHimetric(prcSrc->bottom);
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}
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//+---------------------------------------------------------------------------
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//
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// Function: HMFromPixelRect
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//
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// Synopsis: Converts a Pixel RECT to a Himetric RECTL
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//
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//----------------------------------------------------------------------------
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void
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HMFromPixelRect(RECTL *prcDest, RECT *prcSrc)
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{
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prcDest->left = HimetricFromHPix(prcSrc->left);
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prcDest->top = HimetricFromVPix(prcSrc->top);
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prcDest->right = HimetricFromHPix(prcSrc->right);
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prcDest->bottom = HimetricFromVPix(prcSrc->bottom);
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}
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