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/*******************************************************************************
* * (C) COPYRIGHT MICROSOFT CORPORATION, 1998, 1999, 2000 * * TITLE: IMGS.CPP * * VERSION: 1.0 * * AUTHOR: ShaunIv * * DATE: 1/13/1999 * * DESCRIPTION: Image class * *******************************************************************************/#include "precomp.h"
#pragma hdrstop
#include "imgs.h"
#include <windowsx.h>
#include <atlbase.h>
#include "ssutil.h"
#include "gphelper.h"
CBitmapImage::CBitmapImage(void) : m_hBitmap(NULL), m_hPalette(NULL){ WIA_PUSHFUNCTION(TEXT("CBitmapImage::CBitmapImage"));}
CBitmapImage::~CBitmapImage(void){ WIA_PUSHFUNCTION(TEXT("CBitmapImage::~CBitmapImage")); Destroy();}
void CBitmapImage::Destroy(void){ WIA_PUSHFUNCTION(TEXT("CBitmapImage::Destroy")); if (m_hBitmap) DeleteObject(m_hBitmap); m_hBitmap = NULL; if (m_hPalette) DeleteObject(m_hPalette); m_hPalette = NULL;}
bool CBitmapImage::IsValid(void) const{ return(m_hBitmap != NULL);}
HPALETTE CBitmapImage::Palette(void) const{ return(m_hPalette);}
HBITMAP CBitmapImage::GetBitmap(void) const{ return(m_hBitmap);}
// Create a palette for the image
HPALETTE CBitmapImage::PreparePalette( CSimpleDC &dc, HBITMAP hBitmap ){ WIA_PUSHFUNCTION(TEXT("CBitmapImage::PreparePalette")); HPALETTE hPalette = NULL; if (GetDeviceCaps(dc,RASTERCAPS) & RC_PALETTE) { if (hBitmap) { DIBSECTION ds = {0}; GetObject(hBitmap, sizeof (DIBSECTION), &ds);
int nColors; if (ds.dsBmih.biClrUsed != 0) { nColors = ds.dsBmih.biClrUsed; } else { //
// Handle the special case of an image that claims to be
// a 32bit DIB as a 24bit DIB
//
if (ds.dsBmih.biBitCount == 32) { nColors = 1 << 24; } else { nColors = 1 << ds.dsBmih.biBitCount; } }
//
// Create a halftone palette if the DIB section contains more
// than 256 colors
//
if (nColors > 256) { hPalette = CreateHalftonePalette(dc); }
//
// Create a custom palette from the DIB section's color table
// if the number of colors is 256 or less
//
else { RGBQUAD* pRGB = new RGBQUAD[nColors]; if (pRGB) { CSimpleDC MemDC; MemDC.CreateCompatibleDC(dc); SelectObject( MemDC, hBitmap ); GetDIBColorTable( MemDC, 0, nColors, pRGB );
UINT nSize = sizeof (LOGPALETTE) + (sizeof (PALETTEENTRY) * (nColors - 1));
LOGPALETTE* pLP = (LOGPALETTE*) new BYTE[nSize]; if (pLP) { pLP->palVersion = 0x300; pLP->palNumEntries = (WORD)nColors;
for (int i=0; i<nColors; i++) { pLP->palPalEntry[i].peRed = pRGB[i].rgbRed; pLP->palPalEntry[i].peGreen = pRGB[i].rgbGreen; pLP->palPalEntry[i].peBlue = pRGB[i].rgbBlue; pLP->palPalEntry[i].peFlags = 0; }
hPalette = CreatePalette(pLP); delete[] pLP; } delete[] pRGB; } } } } else { hPalette = CreateHalftonePalette(dc); } WIA_TRACE((TEXT("Returning palette %08X"), hPalette )); return hPalette;}
SIZE CBitmapImage::ImageSize(void) const{ SIZE sizeImage = {0,0}; if (IsValid()) { BITMAP bm = {0}; if (GetObject( m_hBitmap, sizeof(bm), &bm )) { sizeImage.cx = bm.bmWidth; sizeImage.cy = bm.bmHeight; } } return(sizeImage);}
bool CBitmapImage::CreateFromText( LPCTSTR pszText, const RECT &rcScreen, int nMaxScreenPercent ){ Destroy(); HDC hDesktopDC = GetDC(NULL); if (hDesktopDC) { //
// Calculate the maximum size of the text rectangle
//
RECT rcImage = { 0, 0, WiaUiUtil::MulDivNoRound(rcScreen.right - rcScreen.left,nMaxScreenPercent,100), WiaUiUtil::MulDivNoRound(rcScreen.bottom - rcScreen.top,nMaxScreenPercent,100) };
//
// Create a mem dc to hold the bitmap
//
CSimpleDC MemDC; if (MemDC.CreateCompatibleDC(hDesktopDC)) { //
// Use the default UI font
//
SelectObject( MemDC, GetStockObject( DEFAULT_GUI_FONT ) );
//
// Figure out how big the bitmap has to be
//
DrawText( MemDC, pszText, lstrlen(pszText), &rcImage, DT_NOPREFIX|DT_WORDBREAK|DT_CALCRECT|DT_RTLREADING );
//
// Create the bitmap
//
m_hBitmap = CreateCompatibleBitmap( hDesktopDC, rcImage.right, rcImage.bottom );
if (m_hBitmap) { //
// Set the appropriate colors and select the bitmap into the DC
//
SetBkColor( MemDC, RGB(0,0,0) ); SetTextColor( MemDC, RGB(255,255,255) ); SelectBitmap( MemDC, m_hBitmap );
//
// Draw the actual text
//
DrawText( MemDC, pszText, lstrlen(pszText), &rcImage, DT_NOPREFIX|DT_WORDBREAK|DT_RTLREADING ); }
}
//
// Free the desktop DC
//
ReleaseDC(NULL,hDesktopDC); } return m_hBitmap != NULL;}
bool CBitmapImage::Load( CSimpleDC &dc, LPCTSTR pszFilename, const RECT &rcScreen, int nMaxScreenPercent, bool bAllowStretching, bool bDisplayFilename ){ //
// Clean up, if necessary
//
Destroy();
//
// Validate the arguments
//
if (!pszFilename || !lstrlen(pszFilename)) { return false; }
//
// Try to load and scale the image using GDI plus
//
CGdiPlusHelper GdiPlusHelper; 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) { //
// Get the size of the image
//
SIZE sizeImage = ImageSize();
//
// Prepare the image's palette, if it has one
//
m_hPalette = PreparePalette( dc, m_hBitmap );
//
// Add the image title
//
if (bDisplayFilename && *pszFilename) { CSimpleDC MemoryDC; if (MemoryDC.CreateCompatibleDC(dc)) { //
// Prepare the DC and select the current image into it
//
ScreenSaverUtil::SelectPalette( MemoryDC, Palette(), FALSE ); SelectBitmap( MemoryDC, m_hBitmap ); SetBkMode( MemoryDC, TRANSPARENT );
//
// Create the title DC
//
CSimpleDC ImageTitleDC; if (ImageTitleDC.CreateCompatibleDC(dc)) { //
// Prepare the title DC
//
ScreenSaverUtil::SelectPalette( ImageTitleDC, Palette(), FALSE ); SelectFont( ImageTitleDC, (HFONT)GetStockObject(DEFAULT_GUI_FONT) ); SetBkMode( ImageTitleDC, TRANSPARENT );
//
// Calculate the rectangle needed to print the filename
//
RECT rcText; rcText.left = 0; rcText.top = 0; rcText.right = sizeImage.cx; rcText.bottom = sizeImage.cy;
//
// Make a nice margin
//
InflateRect( &rcText, -2, -2 ); DrawText( ImageTitleDC, pszFilename, lstrlen(pszFilename), &rcText, DT_PATH_ELLIPSIS|DT_SINGLELINE|DT_NOPREFIX|DT_TOP|DT_LEFT|DT_CALCRECT ); InflateRect( &rcText, 2, 2 );
//
// If the text rect is bigger than the scaled image, make it the same size
//
if (rcText.right > sizeImage.cx) rcText.right = sizeImage.cx; if (rcText.bottom > sizeImage.cy) rcText.bottom = sizeImage.cy;
//
// Create the bitmap we'll use for the filename
//
BITMAPINFO bmi; ZeroMemory( &bmi, sizeof(BITMAPINFO) ); bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); bmi.bmiHeader.biWidth = rcText.right - rcText.left; bmi.bmiHeader.biHeight = rcText.bottom - rcText.top; bmi.bmiHeader.biPlanes = 1; bmi.bmiHeader.biBitCount = 24; bmi.bmiHeader.biCompression = BI_RGB; PBYTE pBitmapData = NULL; HBITMAP hBmpImageTitle = CreateDIBSection( dc, &bmi, DIB_RGB_COLORS, (LPVOID*)&pBitmapData, NULL, 0 ); if (hBmpImageTitle) { //
// Initialize the Alpha blend stuff
//
BLENDFUNCTION BlendFunction; ZeroMemory( &BlendFunction, sizeof(BlendFunction) ); BlendFunction.BlendOp = AC_SRC_OVER; BlendFunction.SourceConstantAlpha = 128;
//
// Select our new bitmap into the memory dc
//
HBITMAP hOldBitmap = SelectBitmap( ImageTitleDC, hBmpImageTitle );
//
// White background
//
FillRect( ImageTitleDC, &rcText, (HBRUSH)GetStockObject(WHITE_BRUSH));
//
// Alpha blend from the stretched bitmap to our text rect
//
AlphaBlend( ImageTitleDC, 0, 0, rcText.right - rcText.left, rcText.bottom - rcText.top, MemoryDC, rcText.left, rcText.top, rcText.right, rcText.bottom, BlendFunction );
//
// Draw the actual text
//
InflateRect( &rcText, -2, -2 ); DrawText( ImageTitleDC, pszFilename, lstrlen(pszFilename), &rcText, DT_PATH_ELLIPSIS|DT_SINGLELINE|DT_NOPREFIX|DT_TOP|DT_LEFT ); InflateRect( &rcText, 2, 2 );
//
// Copy back to the current image
//
BitBlt( MemoryDC, rcText.left, rcText.top, rcText.right - rcText.left, rcText.bottom - rcText.top, ImageTitleDC, 0, 0, SRCCOPY );
//
// Restore the dc's bitmap, and delete our title background
//
DeleteObject( SelectObject( ImageTitleDC, hOldBitmap ) ); } } } } } return (m_hBitmap != NULL);}
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