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