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379 lines
12 KiB
379 lines
12 KiB
/*******************************************************************************
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*
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* (C) COPYRIGHT MICROSOFT CORPORATION, 1998, 1999, 2000
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*
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* TITLE: IMGS.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: 1/13/1999
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*
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* DESCRIPTION: Image class
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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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#include "imgs.h"
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#include <windowsx.h>
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#include <atlbase.h>
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#include "ssutil.h"
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#include "gphelper.h"
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CBitmapImage::CBitmapImage(void)
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: m_hBitmap(NULL),
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m_hPalette(NULL)
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{
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WIA_PUSHFUNCTION(TEXT("CBitmapImage::CBitmapImage"));
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}
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CBitmapImage::~CBitmapImage(void)
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{
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WIA_PUSHFUNCTION(TEXT("CBitmapImage::~CBitmapImage"));
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Destroy();
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}
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void CBitmapImage::Destroy(void)
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{
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WIA_PUSHFUNCTION(TEXT("CBitmapImage::Destroy"));
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if (m_hBitmap)
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DeleteObject(m_hBitmap);
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m_hBitmap = NULL;
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if (m_hPalette)
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DeleteObject(m_hPalette);
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m_hPalette = NULL;
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}
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bool CBitmapImage::IsValid(void) const
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{
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return(m_hBitmap != NULL);
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}
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HPALETTE CBitmapImage::Palette(void) const
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{
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return(m_hPalette);
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}
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HBITMAP CBitmapImage::GetBitmap(void) const
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{
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return(m_hBitmap);
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}
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// Create a palette for the image
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HPALETTE CBitmapImage::PreparePalette( CSimpleDC &dc, HBITMAP hBitmap )
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{
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WIA_PUSHFUNCTION(TEXT("CBitmapImage::PreparePalette"));
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HPALETTE hPalette = NULL;
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if (GetDeviceCaps(dc,RASTERCAPS) & RC_PALETTE)
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{
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if (hBitmap)
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{
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DIBSECTION ds = {0};
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GetObject(hBitmap, sizeof (DIBSECTION), &ds);
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int nColors;
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if (ds.dsBmih.biClrUsed != 0)
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{
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nColors = ds.dsBmih.biClrUsed;
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}
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else
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{
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//
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// Handle the special case of an image that claims to be
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// a 32bit DIB as a 24bit DIB
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//
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if (ds.dsBmih.biBitCount == 32)
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{
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nColors = 1 << 24;
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}
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else
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{
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nColors = 1 << ds.dsBmih.biBitCount;
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}
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}
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//
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// Create a halftone palette if the DIB section contains more
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// than 256 colors
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//
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if (nColors > 256)
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{
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hPalette = CreateHalftonePalette(dc);
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}
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//
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// Create a custom palette from the DIB section's color table
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// if the number of colors is 256 or less
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//
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else
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{
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RGBQUAD* pRGB = new RGBQUAD[nColors];
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if (pRGB)
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{
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CSimpleDC MemDC;
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MemDC.CreateCompatibleDC(dc);
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SelectObject( MemDC, hBitmap );
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GetDIBColorTable( MemDC, 0, nColors, pRGB );
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UINT nSize = sizeof (LOGPALETTE) + (sizeof (PALETTEENTRY) * (nColors - 1));
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LOGPALETTE* pLP = (LOGPALETTE*) new BYTE[nSize];
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if (pLP)
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{
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pLP->palVersion = 0x300;
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pLP->palNumEntries = (WORD)nColors;
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for (int i=0; i<nColors; i++)
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{
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pLP->palPalEntry[i].peRed = pRGB[i].rgbRed;
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pLP->palPalEntry[i].peGreen = pRGB[i].rgbGreen;
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pLP->palPalEntry[i].peBlue = pRGB[i].rgbBlue;
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pLP->palPalEntry[i].peFlags = 0;
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}
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hPalette = CreatePalette(pLP);
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delete[] pLP;
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}
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delete[] pRGB;
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}
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}
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}
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}
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else
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{
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hPalette = CreateHalftonePalette(dc);
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}
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WIA_TRACE((TEXT("Returning palette %08X"), hPalette ));
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return hPalette;
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}
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SIZE CBitmapImage::ImageSize(void) const
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{
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SIZE sizeImage = {0,0};
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if (IsValid())
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{
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BITMAP bm = {0};
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if (GetObject( m_hBitmap, sizeof(bm), &bm ))
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{
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sizeImage.cx = bm.bmWidth;
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sizeImage.cy = bm.bmHeight;
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}
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}
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return(sizeImage);
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}
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bool CBitmapImage::CreateFromText( LPCTSTR pszText, const RECT &rcScreen, int nMaxScreenPercent )
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{
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Destroy();
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HDC hDesktopDC = GetDC(NULL);
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if (hDesktopDC)
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{
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//
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// Calculate the maximum size of the text rectangle
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//
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RECT rcImage = { 0, 0, WiaUiUtil::MulDivNoRound(rcScreen.right - rcScreen.left,nMaxScreenPercent,100), WiaUiUtil::MulDivNoRound(rcScreen.bottom - rcScreen.top,nMaxScreenPercent,100) };
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//
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// Create a mem dc to hold the bitmap
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//
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CSimpleDC MemDC;
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if (MemDC.CreateCompatibleDC(hDesktopDC))
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{
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//
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// Use the default UI font
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//
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SelectObject( MemDC, GetStockObject( DEFAULT_GUI_FONT ) );
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//
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// Figure out how big the bitmap has to be
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//
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DrawText( MemDC, pszText, lstrlen(pszText), &rcImage, DT_NOPREFIX|DT_WORDBREAK|DT_CALCRECT|DT_RTLREADING );
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//
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// Create the bitmap
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//
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m_hBitmap = CreateCompatibleBitmap( hDesktopDC, rcImage.right, rcImage.bottom );
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if (m_hBitmap)
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{
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//
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// Set the appropriate colors and select the bitmap into the DC
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//
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SetBkColor( MemDC, RGB(0,0,0) );
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SetTextColor( MemDC, RGB(255,255,255) );
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SelectBitmap( MemDC, m_hBitmap );
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//
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// Draw the actual text
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//
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DrawText( MemDC, pszText, lstrlen(pszText), &rcImage, DT_NOPREFIX|DT_WORDBREAK|DT_RTLREADING );
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}
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}
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//
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// Free the desktop DC
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//
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ReleaseDC(NULL,hDesktopDC);
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}
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return m_hBitmap != NULL;
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}
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bool CBitmapImage::Load( CSimpleDC &dc,
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LPCTSTR pszFilename,
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const RECT &rcScreen,
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int nMaxScreenPercent,
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bool bAllowStretching,
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bool bDisplayFilename
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)
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{
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//
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// Clean up, if necessary
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//
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Destroy();
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//
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// Validate the arguments
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//
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if (!pszFilename || !lstrlen(pszFilename))
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{
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return false;
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}
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//
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// Try to load and scale the image using GDI plus
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//
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CGdiPlusHelper GdiPlusHelper;
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if (SUCCEEDED(GdiPlusHelper.LoadAndScale( m_hBitmap, pszFilename, WiaUiUtil::MulDivNoRound(rcScreen.right - rcScreen.left,nMaxScreenPercent,100), WiaUiUtil::MulDivNoRound(rcScreen.bottom - rcScreen.top,nMaxScreenPercent,100), bAllowStretching )) && m_hBitmap)
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{
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//
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// Get the size of the image
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//
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SIZE sizeImage = ImageSize();
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//
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// Prepare the image's palette, if it has one
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//
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m_hPalette = PreparePalette( dc, m_hBitmap );
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//
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// Add the image title
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//
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if (bDisplayFilename && *pszFilename)
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{
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CSimpleDC MemoryDC;
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if (MemoryDC.CreateCompatibleDC(dc))
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{
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//
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// Prepare the DC and select the current image into it
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//
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ScreenSaverUtil::SelectPalette( MemoryDC, Palette(), FALSE );
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SelectBitmap( MemoryDC, m_hBitmap );
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SetBkMode( MemoryDC, TRANSPARENT );
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//
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// Create the title DC
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//
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CSimpleDC ImageTitleDC;
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if (ImageTitleDC.CreateCompatibleDC(dc))
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{
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//
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// Prepare the title DC
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//
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ScreenSaverUtil::SelectPalette( ImageTitleDC, Palette(), FALSE );
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SelectFont( ImageTitleDC, (HFONT)GetStockObject(DEFAULT_GUI_FONT) );
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SetBkMode( ImageTitleDC, TRANSPARENT );
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//
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// Calculate the rectangle needed to print the filename
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//
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RECT rcText;
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rcText.left = 0;
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rcText.top = 0;
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rcText.right = sizeImage.cx;
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rcText.bottom = sizeImage.cy;
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//
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// Make a nice margin
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//
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InflateRect( &rcText, -2, -2 );
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DrawText( ImageTitleDC, pszFilename, lstrlen(pszFilename), &rcText, DT_PATH_ELLIPSIS|DT_SINGLELINE|DT_NOPREFIX|DT_TOP|DT_LEFT|DT_CALCRECT );
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InflateRect( &rcText, 2, 2 );
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//
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// If the text rect is bigger than the scaled image, make it the same size
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//
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if (rcText.right > sizeImage.cx)
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rcText.right = sizeImage.cx;
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if (rcText.bottom > sizeImage.cy)
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rcText.bottom = sizeImage.cy;
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//
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// Create the bitmap we'll use for the filename
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//
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BITMAPINFO bmi;
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ZeroMemory( &bmi, sizeof(BITMAPINFO) );
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bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bmi.bmiHeader.biWidth = rcText.right - rcText.left;
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bmi.bmiHeader.biHeight = rcText.bottom - rcText.top;
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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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PBYTE pBitmapData = NULL;
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HBITMAP hBmpImageTitle = CreateDIBSection( dc, &bmi, DIB_RGB_COLORS, (LPVOID*)&pBitmapData, NULL, 0 );
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if (hBmpImageTitle)
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{
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//
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// Initialize the Alpha blend stuff
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//
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BLENDFUNCTION BlendFunction;
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ZeroMemory( &BlendFunction, sizeof(BlendFunction) );
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BlendFunction.BlendOp = AC_SRC_OVER;
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BlendFunction.SourceConstantAlpha = 128;
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//
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// Select our new bitmap into the memory dc
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//
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HBITMAP hOldBitmap = SelectBitmap( ImageTitleDC, hBmpImageTitle );
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//
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// White background
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//
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FillRect( ImageTitleDC, &rcText, (HBRUSH)GetStockObject(WHITE_BRUSH));
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//
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// Alpha blend from the stretched bitmap to our text rect
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//
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AlphaBlend( ImageTitleDC, 0, 0, rcText.right - rcText.left, rcText.bottom - rcText.top, MemoryDC, rcText.left, rcText.top, rcText.right, rcText.bottom, BlendFunction );
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//
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// Draw the actual text
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//
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InflateRect( &rcText, -2, -2 );
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DrawText( ImageTitleDC, pszFilename, lstrlen(pszFilename), &rcText, DT_PATH_ELLIPSIS|DT_SINGLELINE|DT_NOPREFIX|DT_TOP|DT_LEFT );
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InflateRect( &rcText, 2, 2 );
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//
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// Copy back to the current image
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//
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BitBlt( MemoryDC, rcText.left, rcText.top, rcText.right - rcText.left, rcText.bottom - rcText.top, ImageTitleDC, 0, 0, SRCCOPY );
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//
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// Restore the dc's bitmap, and delete our title background
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//
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DeleteObject( SelectObject( ImageTitleDC, hOldBitmap ) );
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}
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}
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}
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}
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}
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return (m_hBitmap != NULL);
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}
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