Advanced MFC Programming

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Chapter 10. Bitmap …… } The function is implemented as follows (Most part of this function is copied from function CGDIView::OnInitialUpdate()): void CGDIView::LoadBitmap(HGLOBAL hData) { CPalette *pPalDraw; LPBITMAPINFO lpBi; LPLOGPALETTE lpLogPal; int nSizeCT; int i; CGDIDoc *pDoc; pDoc=GetDocument(); ASSERT_VALID(pDoc); lpBi=(LPBITMAPINFO)::GlobalLock(hData); ASSERT(lpBi); nSizeCT=pDoc->GetColorTableSize(lpBi->bmiHeader.biBitCount); pPalDraw=pDoc->GetPalette(); if(pPalDraw->GetSafeHandle() != NULL)pPalDraw->DeleteObject(); if(nSizeCT != 0) { lpLogPal=(LPLOGPALETTE) new BYTE [ sizeof(LOGPALETTE)+(nSizeCT-1)*sizeof(PALETTEENTRY) ]; lpLogPal->palVersion=0x300; lpLogPal->palNumEntries=nSizeCT; for(i=0; ipalPalEntry[i].peRed=lpBi->bmiColors[i].rgbRed; lpLogPal->palPalEntry[i].peGreen=lpBi->bmiColors[i].rgbGreen; lpLogPal->palPalEntry[i].peBlue=lpBi->bmiColors[i].rgbBlue; lpLogPal->palPalEntry[i].peFlags=NULL; } } VERIFY(pPalDraw->CreatePalette(lpLogPal)); delete [](BYTE *)lpLogPal; } ::GlobalUnlock(hData); m_bBitmapLoaded=TRUE; SetScrollSizes ( MM_TEXT, CSize(lpBi->bmiHeader.biWidth, lpBi->bmiHeader.biHeight) ); Invalidate(); With this function, CGDIView::OnInitialUpdate() can be simplified to the following: void CGDIView::OnInitialUpdate() { CGDIDoc *pDoc; HGLOBAL hData; CScrollView::OnInitialUpdate(); pDoc=GetDocument(); ASSERT_VALID(pDoc); } hData=pDoc->GetHDib(); if(hData != NULL)LoadBitmap(hData); else SetScrollSizes(MM_TEXT, CSize(0, 0)); 308
Chapter 10. Bitmap With the above implementation, the application is able to convert a bitmap from 256-color format format to 24-bit format. 10.7 Converting 24-bit Format to 256-color Format Sample 5.7\GDI is based on sample 5.6\GDI, it demonstrates how to convert 24-bit bitmap format to 256-color format. Two Cases To convert a 24-bit format bitmap to 256-color format bitmap, we must extract a color table from the explicit RGB values. There are two cases that must be handled differently: the bitmap uses less than 256 colors, and the bitmap uses more than 256 colors. If the bitmap uses less than 256 colors, the conversion is relatively simple: we just examine every pixel of the bitmap, and extract a color table from all the colors contained in the bitmap. The following is the conversion procedure for this situation: At the beginning, the color table contains no color. Then for each pixel in the bitmap, we examine if the color is contained in the color table. If so, we move to the next pixel. If not, we add the color used by this pixel to the color table. After we go over all the pixels contained in the bitmap, the color table should contain all the colors that are used by the bitmap image. If the bitmap uses more than 256 colors, we must find 256 colors that best represent all the colors used by the image. There are many algorithms for doing this, a relatively simple one is to omit some lower bits of RGB values so that maximum number of colors used by a bitmap does not exceed 256. For example, 24- bit bitmap format uses 8 bit to represent a basic color, it can result in 256×256×256 different colors. If we use only 3 bits to represent red and green color, and use 2 bits to represent blue color, the total number of possible combinations are 8×8×4=256. In this situation, when we examine a pixel, we use the 3 most significant bits of red and green colors, along with 2 most significant bits of blue color to form a new color that will be used to create color table (Other bits will be filled with 0s). By doing this, the colors contained in the color table will not exceed 256. Although this algorithm may result in color distortion, it is relatively fast and less image dependent. Sample In the sample, a new command Convert | RGB to 256 is added to mainframe menu IDR_MAINFRAME, whose command ID is ID_CONVERT_RGBTO256. Also, WM_COMMAND and UPDATE_COMMAND_UI message handlers are added through using Class Wizard. The new corresponding functions are CGDIDoc:: OnConvertRGBto256() and CGDIDoc::OnUpdateConvertRGBto256(…) respectively. Function CGDIDoc::OnUpdateConvertRGBto256(…) is implemented as follows: void CGDIDoc::OnUpdateConvertRGBto256(CCmdUI* pCmdUI) { pCmdUI->Enable(m_nBmpFormat == BMP_FORMAT_24BIT); } If the current bitmap format is 24-bit, command Convert | RGB to 256 will be enabled. The implementation of function CGDIDoc::OnConvertRGBto256() is somehow similar to that of CGDIDoc::OnConvert256toRGB(): we must first lock the global memory where the current 24-bit bitmap image is stored, then calculate the size of new bitmap image (256-color format), allocate enough buffers from global memory, and fill the new bitmap bit values one by one. The first thing we need to do is creating the color table for the new bitmap image. The following portion of function CGDIDoc::OnConvertRGBto256() shows how to extract the color table from explicit RGB colors contained in a 24-bit bitmap image: void CGDIDoc::OnConvertRGBto256() { LPBITMAPINFO lpBi; 309
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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 4. Button Chapter 4 Buttons
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Chapter 4. Button using bit-wise AN
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Chapter 4. Button …… First pBit
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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 Sample Sampel
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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 14. Views void CDirView::Ad
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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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