196 lines
4.0 KiB
C++
196 lines
4.0 KiB
C++
#include "header.h"
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#include "DibCls.H"
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#define _HRESULT_TYPEDEF_(_sc) ((HRESULT)_sc)
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#include <urlmon.h>
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#define WIDTHBYTES(bits) (((bits) + 31) / 32 * 4)
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//=--------------------------------------------------------------------------=
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// DIB Utitilty Classes
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//=--------------------------------------------------------------------------=
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// Not wholey generic but getting there...
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//
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// Notes:
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//
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CDibFile::CDibFile()
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{
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m_headerSize = 0;
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m_bmi.p = 0;
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}
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CDibFile::~CDibFile()
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{
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if( m_bmi.p )
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delete m_bmi.p;
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}
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DWORD CDibFile::CalcImageSize()
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{
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DWORD & dw = m_bmi.p->bmiHeader.biSizeImage;
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if( dw == 0)
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dw = WIDTHBYTES((DWORD)m_bmi.p->bmiHeader.biWidth *
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m_bmi.p->bmiHeader.biBitCount) * m_bmi.p->bmiHeader.biHeight;
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return(dw);
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}
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HRESULT CDibFile::GetInfoHeader( IStream * strm )
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{
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HRESULT hr = S_OK;
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m_bmi.bytes = new unsigned char[ m_headerSize ];
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if( !m_bmi.bytes )
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hr = E_OUTOFMEMORY;
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if( SUCCEEDED(hr) )
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hr = strm->Read(m_bmi.bytes,m_headerSize,0);
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if( SUCCEEDED(hr) )
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CalcImageSize();
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return(hr);
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}
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HRESULT CDibFile::GetFileHeader(IStream * strm)
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{
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BITMAPFILEHEADER bmfh;
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HRESULT hr = strm->Read(&bmfh,sizeof(bmfh),0);
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if( SUCCEEDED(hr) && (bmfh.bfType != 0x4d42 ))
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hr = E_UNEXPECTED;
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if( SUCCEEDED(hr) )
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m_headerSize = bmfh.bfOffBits - sizeof(bmfh);
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return(hr);
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}
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CDibSection::CDibSection()
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{
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m_bitsBase = 0;
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m_current = 0;
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m_memDC = 0;
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m_handle =
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m_oldBitmap = 0;
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m_w =
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m_h = 32; // totally arbitrary
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}
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CDibSection::~CDibSection()
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{
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if( m_memDC )
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{
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if( m_oldBitmap )
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::SelectObject( m_memDC, m_oldBitmap );
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::DeleteDC(m_memDC);
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}
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if( m_handle )
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::DeleteObject(m_handle);
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}
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HRESULT CDibSection::Create(CDibFile& dibFile)
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{
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HRESULT hr = S_OK;
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BITMAPINFOHEADER * bmih = dibFile; // will convert itself
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m_handle = ::CreateDIBSection(
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m_memDC, // handle to device context
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dibFile, // pointer to structure containing bitmap size,
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// format, and color data
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DIB_RGB_COLORS, // color data type indicator: RGB values or
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// palette indices
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(void **)&m_bitsBase, // pointer to variable to receive a pointer
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// to the bitmap's bit values
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0, // optional handle to a file mapping object
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0 // offset to the bitmap bit values
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// within the file mapping object
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);
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if( !m_handle )
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hr = E_FAIL;
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if( SUCCEEDED(hr) )
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{
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m_oldBitmap = ::SelectObject( m_memDC, m_handle );
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if( !m_oldBitmap )
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hr = E_FAIL;
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}
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if( SUCCEEDED(hr) )
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{
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m_current = m_bitsBase;
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m_w = bmih->biWidth;
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m_h = bmih->biHeight;
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if( m_h < 0 )
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m_h *= -1;
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}
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return(hr);
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}
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HRESULT CDibSection::ReadFrom( IStream * strm, DWORD amount )
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{
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DWORD dwRead = 0;
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DWORD dwReadTotal = 0;
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HRESULT hr;
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do
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{
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hr = strm->Read(m_current,amount,&dwRead);
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if( SUCCEEDED(hr) || hr == E_PENDING )
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{
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m_current += dwRead;
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dwReadTotal += dwRead;
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}
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}
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while ( (hr == S_OK) && (dwReadTotal <= amount) );
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return (hr);
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}
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HRESULT CDibSection::Setup(HDC hdc)
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{
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m_memDC = ::CreateCompatibleDC(hdc);
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return( m_memDC ? NOERROR : E_FAIL );
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}
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HRESULT CDibSection::PaintTo(HDC hdc, int x, int y)
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{
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BOOL b = BitBlt(
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hdc, // handle to destination device context
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x, // x-coordinate of destination rectangle's upper-left corner
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y, // x-coordinate of destination rectangle's upper-left corner
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m_w, // width of destination rectangle
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m_h, // height of destination rectangle
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m_memDC, // handle to source device context
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0, // x-coordinate of source rectangle's upper-left corner
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0, // y-coordinate of source rectangle's upper-left corner
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SRCCOPY // raster operation code
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);
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return( b ? NOERROR : E_FAIL );
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}
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HRESULT CDibSection::GetSize(SIZEL &sz)
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{
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sz.cx = m_w;
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sz.cy = m_h;
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return(S_OK);
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}
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