Advanced MFC Programming

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Chapter 10. Bitmap LPBITMAPINFO lpBi24; HGLOBAL hDIB; DWORD dwSize; int nSizeCT; int i, j; int n; LPSTR lpRowSrc; LPSTR lpRowTgt; POSITION pos; CGDIView *ptrView; CPtrArray arRgbQuad; LPRGBQUAD lpRgbQuad; RGBQUAD rgbQuad; BOOL bHit; BOOL bStandardPal; BYTE red, green, blue; …… AfxGetApp()->DoWaitCursor(TRUE); lpBi24=(LPBITMAPINFO)::GlobalLock(m_hDIB); ASSERT(lpBi24); for(j=0; jbmiHeader.biHeight; j++) { lpRowSrc= ( (LPSTR)lpBi24+ sizeof(BITMAPINFOHEADER)+ WIDTHBYTES(lpBi24->bmiHeader.biBitCount*lpBi24->bmiHeader.biWidth)*j ); for(i=0; ibmiHeader.biWidth; i++) { rgbQuad.rgbBlue=*lpRowSrc; rgbQuad.rgbGreen=*(lpRowSrc+1); rgbQuad.rgbRed=*(lpRowSrc+2); rgbQuad.rgbReserved=0; bHit=FALSE; for(n=0; n
Chapter 10. Bitmap …… …… if(arRgbQuad.GetSize() > 256) { while(arRgbQuad.GetSize()) { delete (LPRGBQUAD)arRgbQuad.GetAt(0); arRgbQuad.RemoveAt(0); } red=green=blue=0; for(i=0; irgbBlue=blue; lpRgbQuad->rgbGreen=green; lpRgbQuad->rgbRed=red; lpRgbQuad->rgbReserved=0; if(!(red+=32))if(!(green+=32))blue+=64; arRgbQuad.Add(lpRgbQuad); } bStandardPal=TRUE; } else bStandardPal=FALSE; If the size of color table is greater than 256, we first delete the color table, then create a new color table that contains only 256 colors. This color table comprises 256 colors that are evenly distributed in a 8×8×4 3-D space, which has the following contents: (0, 0, 0) (32, 0, 0) (64, 0, 0) … (224, 0, 0) (0, 32, 0) (32, 32, 0) (64, 0, 0) … (224, 32, 0) (0, 64, 0, ) (32, 64, 0) (64, 64, 0) … (224, 64, 0) …… (0, 224, 0, ) (32, 224, 0) (64, 224, 0) … (224, 224, 0) (0, 0, 64) (32, 0, 64) (64, 0, 64) … (224, 0, 64) (0, 32, 64) (32, 32, 64) (64, 32, 64) … (224, 32, 64) (0, 64, 64) (32, 64, 64) (64, 64, 64) … (224, 64, 64) …… (0, 224, 64) (32, 224, 64) (64, 224, 64) … (224, 224, 64) …… …… (0, 0, 192) (32, 0, 192) (64, 0, 192) … (224, 0, 192) (0, 32, 192) (32, 32, 192) (64, 32, 192) … (224, 32, 192) (0, 64, 192) (32, 64, 192) (64, 64, 192) … (224, 64, 192) …… (0, 224, 192) (32, 224, 192) (64, 224, 192) … (224, 224, 192) For a 24-bit color, if we use only 3 most significant bits of red and green colors, and 2 most significant bits of blue color, and set rest bits to 0. Every possible RGB combination (8 bits for each color) has a corresponding entry in this table. We use a flag bStandardPal to indicate which algorithm was used to generate the color table. This is important because for the two situations the procedure of converting explicit RGB values to indices of color table is different. If the color table is generated directly from the colors contained in the bitmap (first case), each pixel can be mapped to an index in the color table by comparing it with every color in the color table (there must be a hit). Otherwise, we must omit some bits before looking up the color table (second case). Following is a portion of function CGDIDoc::OnConvertRGBto256() that allocates buffers from global memory, fill the buffers with bitmap information header and color table: …… nSizeCT=256; 311
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Advanced MFC Programming Supporting
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Checking a Menu Item 2.2 Right Clic
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Trapping Double Clicking Message Re
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COMMON DIALOG BOXES 7.1 File Open a
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9.1 Outputting Text Using Different
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Summary SAMPLE: SIMPLE PAINT 11.0 P
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13.2 Creating Applications without
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Functions Implementing Comparisons
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Chapter 1. Tool Bar and Dialog Bar
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Chapter 2. Menu Chapter 2 Menu Menu
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Chapter 2. Menu ON_COMMAND(ID_EDIT_
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Chapter 2. Menu “clipboard”. We
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Chapter 2. Menu Using Class CMenu W
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Chapter 2. Menu } After implementin
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Chapter 2. Menu ); UINT nPosition,
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Chapter 2. Menu void CMenuDoc::OnEd
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Chapter 2. Menu } In the sample, bi
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Chapter 2. Menu Message Mapping for
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Chapter 2. Menu CDC *ptrDC; CDC dcM
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Chapter 2. Menu Because the popup m
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Chapter 3. Splitter Window Chapter
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Chapter 3. Splitter Window function
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Chapter 3. Splitter Window BOOL CSp
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Chapter 3. Splitter Window In the a
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Chapter 3. Splitter Window Sample S
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Chapter 3. Splitter Window WM_LBUTT
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Chapter 4. Button Chapter 4 Buttons
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Chapter 4. Button Use string text a
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Chapter 4. Button function, first t
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Chapter 4. Button Now we can remove
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Chapter 4. Button } ( m_bBmpCheck ?
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Chapter 4. Button using bit-wise AN
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Chapter 4. Button Overriding Functi
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Chapter 4. Button …… First pBit
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Chapter 4. Button Using Class MCBit
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Chapter 4. Button The button’s ID
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Chapter 4. Button However, since me
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Chapter 4. Button Here, we use subc
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Chapter 5. Common Controls command
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Chapter 5. Common Controls ((CSpinB
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Chapter 5. Common Controls } The in
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Chapter 5. Common Controls …… B
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Chapter 5. Common Controls The “S
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Chapter 5. Common Controls button
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Chapter 5. Common Controls In this
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Chapter 5. Common Controls (CBN_CLO
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Chapter 5. Common Controls compare
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Chapter 5. Common Controls } ptrEdi
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Chapter 5. Common Controls ……
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Chapter 5. Common Controls void CWn
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Chapter 5. Common Controls This fun
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Chapter 5. Common Controls After cr
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Chapter 5. Common Controls typedef
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Chapter 5. Common Controls Using th
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Chapter 5. Common Controls Paramete
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Chapter 5. Common Controls void MCT
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Chapter 5. Common Controls modifica
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Chapter 5. Common Controls In funct
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Chapter 5. Common Controls Changing
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Chapter 5. Common Controls m_tabCtr
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Chapter 5. Common Controls Custom R
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Chapter 6. Dialog Box Chapter 6 Dia
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Chapter 6. Dialog Box void CMLDialo
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Chapter 6. Dialog Box } Function CP
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Chapter 6. Dialog Box Everything is
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Chapter 6. Dialog Box } MINMAXINFO;
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Chapter 6. Dialog Box Sample Sampel
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Chapter 6. Dialog Box } brush=(HBRU
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Chapter 6. Dialog Box wndA.GetWindo
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Chapter 6. Dialog Box rectStaticGrp
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Chapter 6. Dialog Box } TOOLTIPTEXT
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Chapter 6. Dialog Box ) { } if ( )
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Chapter 6. Dialog Box pWndCtrl=GetW
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Chapter 6. Dialog Box Sample 6.8-2\
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Chapter 6. Dialog Box } // handle t
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Chapter 6. Dialog Box 1) Tracking s
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Chapter 7. Common Dialog Boxes DWOR
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Chapter 7. Common Dialog Boxes } {
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Chapter 7. Common Dialog Boxes dial
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Chapter 7. Common Dialog Boxes Alth
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Chapter 7. Common Dialog Boxes } NU
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Chapter 7. Common Dialog Boxes Stc3
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Chapter 7. Common Dialog Boxes DWOR
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Chapter 7. Common Dialog Boxes Comm
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Chapter 7. Common Dialog Boxes Retr
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Chapter 7. Common Dialog Boxes 7.9
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Chapter 7. Common Dialog Boxes } }
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Chapter 7. Common Dialog Boxes …
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Chapter 8. DC, Pen, Brush and Palet
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Chapter 9. Font Here, member lfFace
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Chapter 9. Font } dlg.m_bBgdStyle=m
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Chapter 9. Font The first element o
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Chapter 9. Font int CALLBACK EnumFo
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Chapter 9. Font }; Variable m_nRang
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Chapter 9. Font Frame border is gra
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Chapter 9. Font CFont *ptrFont; if(
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Chapter 9. Font POINT pt; CClientDC
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Chapter 9. Font } if(dlg.DoModal()
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Chapter 9. Font In this function, W
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Chapter 11. Sample: Simple Paint 1)
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Chapter 14. Views ON_COMMAND(ID_BUT
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Chapter 14. Views IDB_BITMAP_CLOSEF
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Chapter 14. Views Because we do not
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Chapter 14. Views For the root dire
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Chapter 14. Views The columns are a
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Chapter 14. Views …… …… if(
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Chapter 14. Views void CDirView::Ad
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Chapter 14. Views Actually, in the
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Chapter 14. Views } if(szName1.GetL
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Chapter 14. Views Mouse Cursor Coor
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Chapter 16. Context Sensitive Help
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Appendix A. Virtual-key Codes Appen
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Appendix A. Virtual-key Codes Funct
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Appendix B. Ternary Raster Operatio
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Index Index #if, 416 #pragma, 416 .
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Index CDC::SetPixel, 321 CDC::SetRO
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Index CRectTracker, 345 CRectTracke
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Index CWnd::SetMenu, 55 CWnd::SetTi
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Index HBRUSH, 201 HCURSOR, 262 HDAT
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Index Background palette, 224 Chang
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Index Default tool bar, 1 Enable or
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