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/*
* tkWinIco.h --
*
* This file contains declarations for icon-manipulation routines
* in Windows.
*
* Copyright (c) 1995-1996 Microsoft Corp.
* Copyright (c) 1998 Brueckner & Jarosch Ing.GmbH, Erfurt, Germany
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkWinIco.h"
/*
*----------------------------------------------------------------------
*
* DIBNumColors --
*
* Calculates the number of entries in the color table, given by LPSTR
* lpbi - pointer to the CF_DIB memory block. Used by titlebar icon code.
*
* Results:
* WORD - Number of entries in the color table.
*
*----------------------------------------------------------------------
*/
WORD
DIBNumColors(
LPSTR lpbi)
{
WORD wBitCount;
DWORD dwClrUsed;
dwClrUsed = ((LPBITMAPINFOHEADER) lpbi)->biClrUsed;
if (dwClrUsed) {
return (WORD) dwClrUsed;
}
wBitCount = ((LPBITMAPINFOHEADER) lpbi)->biBitCount;
switch (wBitCount) {
case 1:
return 2;
case 4:
return 16;
case 8:
return 256;
default:
return 0;
}
}
/*
*----------------------------------------------------------------------
*
* PaletteSize --
*
* Calculates the number of bytes in the color table, as given by LPSTR
* lpbi - pointer to the CF_DIB memory block. Used by titlebar icon code.
*
* Results:
* Number of bytes in the color table
*
*----------------------------------------------------------------------
*/
static WORD
PaletteSize(
LPSTR lpbi)
{
return (WORD) (DIBNumColors(lpbi) * sizeof(RGBQUAD));
}
/*
*----------------------------------------------------------------------
*
* FindDIBits --
*
* Locate the image bits in a CF_DIB format DIB, as given by LPSTR lpbi -
* pointer to the CF_DIB memory block. Used by titlebar icon code.
*
* Results:
* pointer to the image bits
*
* Side effects: None
*
*
*----------------------------------------------------------------------
*/
LPSTR
FindDIBBits(
LPSTR lpbi)
{
return lpbi + *((LPDWORD) lpbi) + PaletteSize(lpbi);
}
/*
*----------------------------------------------------------------------
*
* BytesPerLine --
*
* Calculates the number of bytes in one scan line, as given by
* LPBITMAPINFOHEADER lpBMIH - pointer to the BITMAPINFOHEADER that
* begins the CF_DIB block. Used by titlebar icon code.
*
* Results:
* number of bytes in one scan line (DWORD aligned)
*
*----------------------------------------------------------------------
*/
DWORD
BytesPerLine(
LPBITMAPINFOHEADER lpBMIH)
{
return WIDTHBYTES(lpBMIH->biWidth * lpBMIH->biPlanes * lpBMIH->biBitCount);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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