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107 lines
2.1 KiB
107 lines
2.1 KiB
/************************************************************************
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* *
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* CBMPINFO.CPP *
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* *
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* Copyright (C) Microsoft Corporation 1993-1994 *
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* All Rights reserved. *
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* *
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************************************************************************/
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#include "stdafx.h"
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#pragma hdrstop
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#include "cbmpinfo.h"
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#ifndef WIDTHBYTES
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#define WIDTHBYTES(i) ((i + 31) / 32 * 4)
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#endif
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static char txtDisplay[] = "DISPLAY";
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CBmpInfo::CBmpInfo(HBITMAP hbmpOrg, int cColors)
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{
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hbmp = hbmpOrg; // save the bitmap handle
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BITMAP bmp;
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GetObject(hbmp, sizeof(BITMAP), &bmp);
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if (cColors == -1) {
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// 24-bit images don't have a color palette
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if (bmp.bmBitsPixel == 24)
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cColors = 0;
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else
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cColors =
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1 << (UINT) (bmp.bmPlanes * bmp.bmBitsPixel);
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}
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cclrs = cColors;
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pbmi = (PBITMAPINFO) lcCalloc(sizeof(BITMAPINFOHEADER) +
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sizeof(RGBQUAD) * cColors);
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pbih = (PBITMAPINFOHEADER) pbmi;
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pbih->biPlanes = 1;
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pbih->biBitCount = GetBitCount(cColors);
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pbih->biSizeImage = WIDTHBYTES((DWORD) bmp.bmWidth *
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pbih->biBitCount) * bmp.bmHeight;
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pbih->biSize = sizeof(BITMAPINFOHEADER);
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pbih->biWidth = bmp.bmWidth;
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pbih->biHeight = bmp.bmHeight;
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pbih->biCompression = BI_RGB;
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// REVIEW: do we need this?
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HDC hdcScreen = CreateIC(txtDisplay, NULL, NULL, NULL);
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ASSERT(hdcScreen);
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// Fill in the screen resolution
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pbih->biYPelsPerMeter = (DWORD) GetDeviceCaps(hdcScreen, LOGPIXELSY);
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pbih->biXPelsPerMeter = (DWORD) GetDeviceCaps(hdcScreen, LOGPIXELSX);
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DeleteDC(hdcScreen);
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// Leave everything else zero'd out
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}
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CBmpInfo::~CBmpInfo(void)
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{
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lcFree(pbmi);
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}
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/***************************************************************************
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FUNCTION: GetBitCount
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PURPOSE: Get number of bits per pixel
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PARAMETERS:
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cColors
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RETURNS:
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COMMENTS:
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MODIFICATION DATES:
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26-Apr-1993 [ralphw]
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***************************************************************************/
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int STDCALL GetBitCount(int cColors)
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{
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switch (cColors) {
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case 2:
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return 1;
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case 16:
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return 4;
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case 256:
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return 8;
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case 0:
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return 24;
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}
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return -1;
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}
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