121 lines
4.4 KiB
C++
121 lines
4.4 KiB
C++
/*******************************************************************************
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*
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* (C) COPYRIGHT MICROSOFT CORPORATION, 1998
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*
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* TITLE: RESCALE.CPP
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*
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* VERSION: 1.0
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*
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* AUTHOR: ShaunIv
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*
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* DATE: 10/15/1998
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*
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* DESCRIPTION: Scale HBITMAPs using StretchBlt
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*
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*******************************************************************************/
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#include "precomp.h"
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#pragma hdrstop
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/*
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* ScaleImage: Scale hBmpSrc and store the scaled dib in hBmpTgt
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*/
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HRESULT ScaleImage( HDC hDC, HBITMAP hBmpSrc, HBITMAP &hBmpTgt, const SIZE &sizeTgt )
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{
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WIA_PUSH_FUNCTION((TEXT("ScaleImage( sizeTgt = [%d,%d] )"), sizeTgt.cx, sizeTgt.cy ));
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BITMAPINFO bmi;
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BITMAP bm;
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HRESULT hr = E_FAIL;
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HBITMAP hBmp = NULL;
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hBmpTgt = NULL;
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GetObject( hBmpSrc, sizeof(BITMAP), &bm );
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ZeroMemory( &bmi, sizeof(BITMAPINFO) );
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bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bmi.bmiHeader.biWidth = sizeTgt.cx;
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bmi.bmiHeader.biHeight = sizeTgt.cy;
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bmi.bmiHeader.biPlanes = 1;
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bmi.bmiHeader.biBitCount = 24;
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bmi.bmiHeader.biCompression = BI_RGB;
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HPALETTE hHalftonePalette = CreateHalftonePalette(hDC);
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if (hHalftonePalette)
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{
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PBYTE pBitmapData = NULL;
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hBmp = CreateDIBSection( hDC, &bmi, DIB_RGB_COLORS, (LPVOID*)&pBitmapData, NULL, 0 );
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if (hBmp)
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{
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// Create the source dc
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HDC hMemoryDC = CreateCompatibleDC( hDC );
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if (hMemoryDC)
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{
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HPALETTE hOldMemDCPalette = SelectPalette( hMemoryDC, hHalftonePalette , 0 );
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RealizePalette( hMemoryDC );
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SetBrushOrgEx( hMemoryDC, 0,0, NULL );
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HBITMAP hOldMemDCBitmap = (HBITMAP)SelectObject( hMemoryDC, hBmpSrc );
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// Create the target dc
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HDC hStretchDC = CreateCompatibleDC( hDC );
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if (hStretchDC)
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{
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HPALETTE hOldStretchDCPalette = SelectPalette( hStretchDC, hHalftonePalette , 0 );
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RealizePalette( hStretchDC );
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SetBrushOrgEx( hStretchDC, 0,0, NULL );
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HBITMAP hOldStretchDCBitmap = (HBITMAP)SelectObject( hStretchDC, hBmp );
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INT nOldStretchMode = SetStretchBltMode( hStretchDC, STRETCH_HALFTONE );
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SIZE sizeScaled;
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// Width is constraining factor
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if (sizeTgt.cy*bm.bmWidth > sizeTgt.cx*bm.bmHeight)
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{
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sizeScaled.cx = sizeTgt.cx;
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sizeScaled.cy = WiaUiUtil::MulDivNoRound(bm.bmHeight,sizeTgt.cx,bm.bmWidth);
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}
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// Height is constraining factor
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else
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{
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sizeScaled.cx = WiaUiUtil::MulDivNoRound(bm.bmWidth,sizeTgt.cy,bm.bmHeight);
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sizeScaled.cy = sizeTgt.cy;
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}
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// Fill the background
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RECT rc;
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rc.left = rc.top = 0;
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rc.right = sizeTgt.cx;
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rc.bottom = sizeTgt.cy;
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FillRect( hStretchDC, &rc, GetSysColorBrush(COLOR_WINDOW) );
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// Paint the image
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StretchBlt( hStretchDC, (sizeTgt.cx - sizeScaled.cx) / 2, (sizeTgt.cy - sizeScaled.cy) / 2, sizeScaled.cx, sizeScaled.cy, hMemoryDC, 0, 0, bm.bmWidth, bm.bmHeight, SRCCOPY );
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// Everything is OK
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hBmpTgt = hBmp;
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hr = S_OK;
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// Restore the dc's state and delete it
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SetStretchBltMode( hStretchDC, nOldStretchMode );
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SelectObject( hStretchDC, hOldStretchDCBitmap );
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SelectPalette( hStretchDC, hOldStretchDCPalette , 0 );
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DeleteDC( hStretchDC );
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}
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// Restore the dc's state
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SelectObject( hMemoryDC, hOldMemDCBitmap );
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SelectPalette( hMemoryDC, hOldMemDCPalette , 0 );
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DeleteDC( hMemoryDC );
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}
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}
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if (hHalftonePalette)
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{
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DeleteObject( hHalftonePalette );
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}
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}
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// Clean up the new bitmap if there was an error
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if (!SUCCEEDED(hr) && hBmp)
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DeleteObject( hBmp );
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WIA_TRACE((TEXT("hBmpTgt = %p")));
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return (hr);
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}
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