267 lines
9.5 KiB
C
267 lines
9.5 KiB
C
/*******************************************************************************
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* *
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* MODULE : DIB.C *
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* *
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* DESCRIPTION : Routines for dealing with Device Independent Bitmaps. *
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* *
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* PaletteSize() - Calculates the palette size in bytes *
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* of given DIB *
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* *
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* DibNumColors() - Determines the number of colors in DIB *
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* *
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* BitmapFromDib() - Creates a DDB given a global handle to *
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* a block in CF_DIB format. *
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* *
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* DibFromBitmap() - Creates a DIB repr. the DDB passed in. *
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* *
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*******************************************************************************/
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#include <windows.h>
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#include "dib.h"
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static HCURSOR hcurSave;
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/****************************************************************************
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* *
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* FUNCTION : PaletteSize(VOID FAR * pv) *
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* *
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* PURPOSE : Calculates the palette size in bytes. If the info. block *
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* is of the BITMAPCOREHEADER type, the number of colors is *
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* multiplied by 3 to give the palette size, otherwise the *
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* number of colors is multiplied by 4. *
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* *
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* RETURNS : Palette size in number of bytes. *
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* *
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****************************************************************************/
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WORD PaletteSize (pv)
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VOID FAR * pv;
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{
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LPBITMAPINFOHEADER lpbi;
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WORD NumColors;
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lpbi = (LPBITMAPINFOHEADER)pv;
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NumColors = DibNumColors(lpbi);
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if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
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return NumColors * sizeof(RGBTRIPLE);
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else
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return NumColors * sizeof(RGBQUAD);
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}
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/****************************************************************************
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* *
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* FUNCTION : DibNumColors(VOID FAR * pv) *
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* *
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* PURPOSE : Determines the number of colors in the DIB by looking at *
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* the BitCount filed in the info block. *
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* *
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* RETURNS : The number of colors in the DIB. *
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* *
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****************************************************************************/
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WORD DibNumColors (pv)
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VOID FAR * pv;
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{
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int bits;
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LPBITMAPINFOHEADER lpbi;
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LPBITMAPCOREHEADER lpbc;
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lpbi = ((LPBITMAPINFOHEADER)pv);
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lpbc = ((LPBITMAPCOREHEADER)pv);
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/* With the BITMAPINFO format headers, the size of the palette
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* is in biClrUsed, whereas in the BITMAPCORE - style headers, it
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* is dependent on the bits per pixel ( = 2 raised to the power of
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* bits/pixel).
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*/
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if (lpbi->biSize != sizeof(BITMAPCOREHEADER)){
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if (lpbi->biClrUsed != 0)
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return (WORD)lpbi->biClrUsed;
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bits = lpbi->biBitCount;
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}
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else
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bits = lpbc->bcBitCount;
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switch (bits){
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case 1:
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return 2;
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case 4:
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return 16;
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case 8:
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return 256;
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default:
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/* A 24 bitcount DIB has no color table */
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return 0;
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}
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}
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/****************************************************************************
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* *
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* FUNCTION : DibFromBitmap() *
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* *
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* PURPOSE : Will create a global memory block in DIB format that *
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* represents the Device-dependent bitmap (DDB) passed in. *
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* *
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* RETURNS : A handle to the DIB *
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* *
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****************************************************************************/
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HANDLE DibFromBitmap (hbm, biStyle, biBits, hpal)
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HBITMAP hbm;
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DWORD biStyle;
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WORD biBits;
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HPALETTE hpal;
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{
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BITMAP bm;
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BITMAPINFOHEADER bi;
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BITMAPINFOHEADER FAR *lpbi;
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DWORD dwLen;
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HANDLE hdib;
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HANDLE h;
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HDC hdc;
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if (!hbm)
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return NULL;
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if (hpal == NULL)
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hpal = GetStockObject(DEFAULT_PALETTE);
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GetObject(hbm,sizeof(bm),(LPSTR)&bm);
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if (biBits == 0)
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biBits = bm.bmPlanes * bm.bmBitsPixel;
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bi.biSize = sizeof(BITMAPINFOHEADER);
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bi.biWidth = bm.bmWidth;
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bi.biHeight = bm.bmHeight;
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bi.biPlanes = 1;
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bi.biBitCount = biBits;
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bi.biCompression = biStyle;
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bi.biSizeImage = 0;
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bi.biXPelsPerMeter = 0;
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bi.biYPelsPerMeter = 0;
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bi.biClrUsed = 0;
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bi.biClrImportant = 0;
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dwLen = bi.biSize + PaletteSize(&bi);
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hdc = GetDC(NULL);
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hpal = SelectPalette(hdc,hpal,FALSE);
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RealizePalette(hdc);
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hdib = GlobalAlloc(GHND,dwLen);
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if (!hdib){
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SelectPalette(hdc,hpal,FALSE);
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ReleaseDC(NULL,hdc);
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return NULL;
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}
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lpbi = (VOID FAR *)GlobalLock(hdib);
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*lpbi = bi;
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/* call GetDIBits with a NULL lpBits param, so it will calculate the
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* biSizeImage field for us
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*/
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GetDIBits(hdc, hbm, 0, (WORD)bi.biHeight,
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NULL, (LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
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bi = *lpbi;
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GlobalUnlock(hdib);
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/* If the driver did not fill in the biSizeImage field, make one up */
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if (bi.biSizeImage == 0){
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bi.biSizeImage = WIDTHBYTES((DWORD)bm.bmWidth * biBits) * bm.bmHeight;
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if (biStyle != BI_RGB)
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bi.biSizeImage = (bi.biSizeImage * 3) / 2;
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}
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/* realloc the buffer big enough to hold all the bits */
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dwLen = bi.biSize + PaletteSize(&bi) + bi.biSizeImage;
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if (h = GlobalReAlloc(hdib,dwLen,0))
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hdib = h;
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else{
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GlobalFree(hdib);
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hdib = NULL;
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SelectPalette(hdc,hpal,FALSE);
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ReleaseDC(NULL,hdc);
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return hdib;
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}
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/* call GetDIBits with a NON-NULL lpBits param, and actualy get the
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* bits this time
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*/
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lpbi = (VOID FAR *)GlobalLock(hdib);
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if (GetDIBits( hdc,
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hbm,
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0,
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(WORD)bi.biHeight,
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(LPSTR)lpbi + (WORD)lpbi->biSize + PaletteSize(lpbi),
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(LPBITMAPINFO)lpbi, DIB_RGB_COLORS) == 0){
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GlobalUnlock(hdib);
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hdib = NULL;
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SelectPalette(hdc,hpal,FALSE);
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ReleaseDC(NULL,hdc);
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return NULL;
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}
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bi = *lpbi;
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GlobalUnlock(hdib);
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SelectPalette(hdc,hpal,FALSE);
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ReleaseDC(NULL,hdc);
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return hdib;
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}
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/****************************************************************************
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* *
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* FUNCTION : BitmapFromDib(HANDLE hdib, HPALETTE hpal) *
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* *
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* PURPOSE : Will create a DDB (Device Dependent Bitmap) given a global *
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* handle to a memory block in CF_DIB format *
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* *
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* RETURNS : A handle to the DDB. *
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* *
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****************************************************************************/
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HBITMAP BitmapFromDib (HANDLE hdib,HPALETTE hpal)
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{
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LPBITMAPINFOHEADER lpbi;
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HPALETTE hpalT;
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HDC hdc;
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HBITMAP hbm;
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StartWait();
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if (!hdib)
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return NULL;
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lpbi = (VOID FAR *)GlobalLock(hdib);
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if (!lpbi)
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return NULL;
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hdc = GetDC(NULL);
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if (hpal){
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hpalT = SelectPalette(hdc,hpal,FALSE);
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RealizePalette(hdc); // GDI Bug...????
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}
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hbm = CreateDIBitmap(hdc,
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(LPBITMAPINFOHEADER)lpbi,
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(LONG)CBM_INIT,
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(LPSTR)lpbi + lpbi->biSize + PaletteSize(lpbi),
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(LPBITMAPINFO)lpbi,
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DIB_RGB_COLORS );
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if (hpal)
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SelectPalette(hdc,hpalT,FALSE);
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ReleaseDC(NULL,hdc);
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GlobalUnlock(hdib);
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EndWait();
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return hbm;
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}
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