467 lines
17 KiB
C
467 lines
17 KiB
C
/******************************Module*Header*******************************\
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* Module Name: dib.c
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*
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* (Brief description)
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*
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* Created: 21-Feb-1994 23:12:58
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* Author: Gilman Wong [gilmanw]
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*
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* Copyright (c) 1994 Microsoft Corporation
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*
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* (General description of its use)
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*
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* Dependencies:
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*
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* (#defines)
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* (#includes)
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*
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\**************************************************************************/
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#include <windows.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "tk.h"
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#define BFT_BITMAP 0x4d42 // 'BM' -- indicates structure is BITMAPFILEHEADER
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// struct BITMAPFILEHEADER {
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// WORD bfType
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// DWORD bfSize
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// WORD bfReserved1
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// WORD bfReserved2
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// DWORD bfOffBits
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// }
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#define OFFSET_bfType 0
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#define OFFSET_bfSize 2
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#define OFFSET_bfReserved1 6
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#define OFFSET_bfReserved2 8
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#define OFFSET_bfOffBits 10
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#define SIZEOF_BITMAPFILEHEADER 14
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// Read a WORD-aligned DWORD. Needed because BITMAPFILEHEADER has
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// WORD-alignment.
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#define READDWORD(pv) ( (DWORD)((PWORD)(pv))[0] \
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| ((DWORD)((PWORD)(pv))[1] << 16) ) \
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// Computes the number of BYTES needed to contain n number of bits.
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#define BITS2BYTES(n) ( ((n) + 7) >> 3 )
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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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* Stolen from SDK ShowDIB example. *
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****************************************************************************/
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WORD DibNumColors(VOID FAR * pv)
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{
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WORD 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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* Because of the way we use this call, BITMAPINFOHEADER may be out
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* of alignment if it follows a BITMAPFILEHEADER. So use the macro
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* to safely access DWORD fields.
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*/
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if (READDWORD(&lpbi->biSize) != sizeof(BITMAPCOREHEADER)){
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if (READDWORD(&lpbi->biClrUsed) != 0)
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{
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return (WORD) READDWORD(&lpbi->biClrUsed);
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}
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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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/******************************Public*Routine******************************\
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* tkDIBImageLoad
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*
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* ANSI version stub. Only here for orthogonality with tkRGBImageLoad.
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*
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* History:
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* 22-Feb-1994 -by- Gilman Wong [gilmanw]
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* Wrote it.
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\**************************************************************************/
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TK_RGBImageRec *tkDIBImageLoadAW(char *fileName, BOOL bUnicode);
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TK_RGBImageRec *tkDIBImageLoad(char *fileName)
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{
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return tkDIBImageLoadAW(fileName, FALSE);
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}
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/******************************Public*Routine******************************\
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* tkDIBImageLoadAW
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*
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* Loads a DIB file (specified as either an ANSI or Unicode filename,
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* depending on the bUnicode flag) and converts it into a TK image format.
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*
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* The technique used is based on CreateDIBSection and SetDIBits.
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* CreateDIBSection is used to create a DIB with a format easily converted
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* into the TK image format (packed 24BPP RGB)--namely 32BPP RGB. The
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* resulting bitmap is selected into a memory DC.
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*
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* The DIB file is mapped into memory and SetDIBits called to initialize
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* the memory DC bitmap. It is during this step that GDI converts the
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* arbitrary DIB file format to our 32BPP RGB format.
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*
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* Finally, the 32BPP RGB data in the DIB section is read out and repacked
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* as 24BPP RGB.
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*
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* Returns:
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* Pointer to TK_RGBImageRec. If an error occurs, a diagnostic error
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* message is put into the error stream and tkQuit() is called,
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* terminating the app.
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*
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* History:
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* 22-Feb-1994 -by- Gilman Wong [gilmanw]
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* Wrote it.
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\**************************************************************************/
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TK_RGBImageRec *tkDIBImageLoadAW(char *fileName, BOOL bUnicode)
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{
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TK_RGBImageRec *final = (TK_RGBImageRec *) NULL; // Ptr to TK image struct
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// to return. Non-NULL
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// only for success.
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WORD wNumColors; // Number of colors in color table
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BITMAPFILEHEADER *pbmf; // Ptr to file header
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BITMAPINFOHEADER *pbmihFile; // Ptr to file's info header (if it exists)
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BITMAPCOREHEADER *pbmchFile; // Ptr to file's core header (if it exists)
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PVOID pvBitsFile; // Ptr to bitmap bits in file
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PBYTE pjBitsRGB; // Ptr to 32BPP RGB image in DIB section
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PBYTE pjTKBits; // Ptr to final TK image bits
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PBYTE pjSrc; // Ptr to image file used for conversion
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PBYTE pjDst; // Ptr to TK image used for conversion
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// These need to be cleaned up when we exit:
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HANDLE hFile = INVALID_HANDLE_VALUE; // File handle
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HANDLE hMap = (HANDLE) NULL; // Mapping object handle
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PVOID pvFile = (PVOID) NULL; // Ptr to mapped file
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HDC hdcMem = (HDC) NULL; // 32BPP mem DC
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HBITMAP hbmRGB = (HBITMAP) NULL; // 32BPP RGB bitmap
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BITMAPINFO *pbmiSource = (BITMAPINFO *) NULL; // Ptr to 32BPP BITMAPINFO
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BITMAPINFO *pbmiRGB = (BITMAPINFO *) NULL; // Ptr tp file's BITMAPINFO
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int i, j;
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// Map the DIB file into memory.
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hFile = bUnicode ? CreateFileW((LPWSTR) fileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0) :
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CreateFileA((LPSTR) fileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0);
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if (hFile == INVALID_HANDLE_VALUE)
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goto tkDIBLoadImage_cleanup;
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hMap = CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
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if (!hMap)
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goto tkDIBLoadImage_cleanup;
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pvFile = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0);
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if (!pvFile)
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goto tkDIBLoadImage_cleanup;
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// Check the file header. If the BFT_BITMAP magic number is there,
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// then the file format is a BITMAPFILEHEADER followed immediately
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// by either a BITMAPINFOHEADER or a BITMAPCOREHEADER. The bitmap
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// bits, in this case, are located at the offset bfOffBits from the
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// BITMAPFILEHEADER.
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//
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// Otherwise, this may be a raw BITMAPINFOHEADER or BITMAPCOREHEADER
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// followed immediately with the color table and the bitmap bits.
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pbmf = (BITMAPFILEHEADER *) pvFile;
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if ( pbmf->bfType == BFT_BITMAP )
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{
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pbmihFile = (BITMAPINFOHEADER *) ((PBYTE) pbmf + SIZEOF_BITMAPFILEHEADER);
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// BITMAPFILEHEADER is WORD aligned, so use safe macro to read DWORD
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// bfOffBits field.
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pvBitsFile = (PVOID *) ((PBYTE) pbmf
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+ READDWORD((PBYTE) pbmf + OFFSET_bfOffBits));
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}
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else
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{
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pbmihFile = (BITMAPINFOHEADER *) pvFile;
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// Determination of where the bitmaps bits are needs to wait until we
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// know for sure whether we have a BITMAPINFOHEADER or a BITMAPCOREHEADER.
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}
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// Determine the number of colors in the DIB palette. This is non-zero
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// only for 8BPP or less.
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wNumColors = DibNumColors(pbmihFile);
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// Create a BITMAPINFO (with color table) for the DIB file. Because the
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// file may not have one (BITMAPCORE case) and potential alignment problems,
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// we will create a new one in memory we allocate.
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//
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// We distinguish between BITMAPINFO and BITMAPCORE cases based upon
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// BITMAPINFOHEADER.biSize.
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pbmiSource = (BITMAPINFO *)
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LocalAlloc(LMEM_FIXED, sizeof(BITMAPINFO)
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+ wNumColors * sizeof(RGBQUAD));
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if (!pbmiSource)
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{
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MessageBoxA(NULL, "Out of memory.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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// Note: need to use safe READDWORD macro because pbmihFile may
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// have only WORD alignment if it follows a BITMAPFILEHEADER.
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switch (READDWORD(&pbmihFile->biSize))
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{
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case sizeof(BITMAPINFOHEADER):
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// Convert WORD-aligned BITMAPINFOHEADER to aligned BITMAPINFO.
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pbmiSource->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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pbmiSource->bmiHeader.biWidth = READDWORD(&pbmihFile->biWidth);
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pbmiSource->bmiHeader.biHeight = READDWORD(&pbmihFile->biHeight);
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pbmiSource->bmiHeader.biPlanes = pbmihFile->biPlanes;
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pbmiSource->bmiHeader.biBitCount = pbmihFile->biBitCount;
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pbmiSource->bmiHeader.biCompression = READDWORD(&pbmihFile->biCompression);
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pbmiSource->bmiHeader.biSizeImage = READDWORD(&pbmihFile->biSizeImage);
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pbmiSource->bmiHeader.biXPelsPerMeter = READDWORD(&pbmihFile->biXPelsPerMeter);
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pbmiSource->bmiHeader.biYPelsPerMeter = READDWORD(&pbmihFile->biYPelsPerMeter);
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pbmiSource->bmiHeader.biClrUsed = READDWORD(&pbmihFile->biClrUsed);
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pbmiSource->bmiHeader.biClrImportant = READDWORD(&pbmihFile->biClrImportant);
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// Copy color table. It immediately follows the BITMAPINFOHEADER.
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memcpy((PVOID) &pbmiSource->bmiColors[0], (PVOID) (pbmihFile + 1),
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wNumColors * sizeof(RGBQUAD));
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// If we haven't already determined the position of the image bits,
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// we may now assume that they immediately follow the color table.
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if (!pvBitsFile)
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pvBitsFile = (PVOID) ((PBYTE) (pbmihFile + 1)
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+ wNumColors * sizeof(RGBQUAD));
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break;
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case sizeof(BITMAPCOREHEADER):
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pbmchFile = (BITMAPCOREHEADER *) pbmihFile;
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// Convert BITMAPCOREHEADER to BITMAPINFOHEADER.
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pbmiSource->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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pbmiSource->bmiHeader.biWidth = (DWORD) pbmchFile->bcWidth;
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pbmiSource->bmiHeader.biHeight = (DWORD) pbmchFile->bcHeight;
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pbmiSource->bmiHeader.biPlanes = pbmchFile->bcPlanes;
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pbmiSource->bmiHeader.biBitCount = pbmchFile->bcBitCount;
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pbmiSource->bmiHeader.biCompression = BI_RGB;
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pbmiSource->bmiHeader.biSizeImage = 0;
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pbmiSource->bmiHeader.biXPelsPerMeter = 0;
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pbmiSource->bmiHeader.biYPelsPerMeter = 0;
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pbmiSource->bmiHeader.biClrUsed = wNumColors;
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pbmiSource->bmiHeader.biClrImportant = wNumColors;
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// Convert RGBTRIPLE color table into RGBQUAD color table.
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{
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RGBQUAD *rgb4 = pbmiSource->bmiColors;
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RGBTRIPLE *rgb3 = (RGBTRIPLE *) (pbmchFile + 1);
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for (i = 0; i < wNumColors; i++)
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{
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rgb4->rgbRed = rgb3->rgbtRed ;
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rgb4->rgbGreen = rgb3->rgbtGreen;
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rgb4->rgbBlue = rgb3->rgbtBlue ;
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rgb4->rgbReserved = 0;
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rgb4++;
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rgb3++;
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}
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}
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// If we haven't already determined the position of the image bits,
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// we may now assume that they immediately follow the color table.
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if (!pvBitsFile)
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pvBitsFile = (PVOID) ((PBYTE) (pbmihFile + 1)
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+ wNumColors * sizeof(RGBTRIPLE));
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break;
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default:
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MessageBoxA(NULL, "Unknown DIB file format.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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// Fill in default values (for fields that can have defaults).
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if (pbmiSource->bmiHeader.biSizeImage == 0)
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pbmiSource->bmiHeader.biSizeImage = BITS2BYTES((DWORD) pbmiSource->bmiHeader.biWidth * pbmiSource->bmiHeader.biBitCount) * pbmiSource->bmiHeader.biHeight;
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if (pbmiSource->bmiHeader.biClrUsed == 0)
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pbmiSource->bmiHeader.biClrUsed = wNumColors;
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// Create memory DC.
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hdcMem = CreateCompatibleDC(NULL);
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if (!hdcMem)
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{
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MessageBoxA(NULL, "Out of memory.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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// Create a 32BPP RGB DIB section and select it into the memory DC.
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pbmiRGB = (BITMAPINFO *)
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LocalAlloc(LMEM_FIXED|LMEM_ZEROINIT, sizeof(BITMAPINFO)
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+ 2 * sizeof(RGBQUAD));
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if (!pbmiRGB)
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{
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MessageBoxA(NULL, "Out of memory.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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pbmiRGB->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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pbmiRGB->bmiHeader.biWidth = pbmiSource->bmiHeader.biWidth;
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pbmiRGB->bmiHeader.biHeight = pbmiSource->bmiHeader.biHeight;
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pbmiRGB->bmiHeader.biPlanes = 1;
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pbmiRGB->bmiHeader.biBitCount = 32;
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pbmiRGB->bmiHeader.biCompression = BI_BITFIELDS;
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pbmiRGB->bmiHeader.biSizeImage = pbmiRGB->bmiHeader.biWidth
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* abs(pbmiRGB->bmiHeader.biHeight) * 4;
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// This may look backwards, but because of the ordering of RGBQUADS,
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// this will yield an RGB format (vs. the BGR format that will result
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// from the "natural" ordering).
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pbmiRGB->bmiColors[0].rgbBlue = 0xff; // red mask
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pbmiRGB->bmiColors[1].rgbGreen = 0xff; // green mask
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pbmiRGB->bmiColors[2].rgbRed = 0xff; // blue mask
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hbmRGB = CreateDIBSection(hdcMem, pbmiRGB, DIB_RGB_COLORS, (PVOID *) &pjBitsRGB, NULL, 0);
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if (!hbmRGB)
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{
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MessageBoxA(NULL, "Out of memory.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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if (!SelectObject(hdcMem, hbmRGB))
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{
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MessageBoxA(NULL, "Out of memory.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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// Slam the DIB file image into the memory DC. GDI will do the work of
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// translating whatever format the DIB file has into our 32BPP RGB format.
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if (!SetDIBits(hdcMem, hbmRGB, 0, pbmiSource->bmiHeader.biHeight, pvBitsFile, pbmiSource, DIB_RGB_COLORS))
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{
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MessageBoxA(NULL, "Image file conversion error.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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// Convert to TK image format (packed RGB format).
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pjTKBits = (PBYTE) LocalAlloc(LMEM_FIXED, pbmiRGB->bmiHeader.biSizeImage);
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if (!pjTKBits)
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{
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MessageBoxA(NULL, "Out of memory.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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pjSrc = pjBitsRGB;
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pjDst = pjTKBits;
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for (i = 0; i < pbmiSource->bmiHeader.biHeight; i++)
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{
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for (j = 0; j < pbmiSource->bmiHeader.biWidth; j++)
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{
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*pjDst++ = *pjSrc++;
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*pjDst++ = *pjSrc++;
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*pjDst++ = *pjSrc++;
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pjSrc++;
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}
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}
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// Allocate and initialize the TK_RGBImageRec.
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final = (TK_RGBImageRec *)malloc(sizeof(TK_RGBImageRec));
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if (final == NULL) {
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MessageBoxA(NULL, "Out of memory.", "Error", MB_OK);
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goto tkDIBLoadImage_cleanup;
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}
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// If we get to here, we have suceeded!
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final->sizeX = pbmiSource->bmiHeader.biWidth;
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final->sizeY = pbmiSource->bmiHeader.biHeight;
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final->data = pjTKBits;
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// Cleanup objects.
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tkDIBLoadImage_cleanup:
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{
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if (hdcMem)
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DeleteDC(hdcMem);
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if (hbmRGB)
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DeleteObject(hbmRGB);
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if (pbmiRGB)
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LocalFree(pbmiRGB);
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if (pbmiSource)
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LocalFree(pbmiSource);
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if (pvFile)
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UnmapViewOfFile(pvFile);
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if (hMap)
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CloseHandle(hMap);
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if (hFile != INVALID_HANDLE_VALUE)
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CloseHandle(hFile);
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}
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// Check for error.
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if (!final)
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{
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if ( (hFile == INVALID_HANDLE_VALUE) || !hMap || !pvFile )
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{
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CHAR ach[256];
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bUnicode ? wsprintf(ach, "Failed to open DIB file %ws.\n", fileName) :
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wsprintf(ach, "Failed to open DIB file %s.\n", fileName);
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MessageBoxA(NULL, ach, "Error", MB_OK);
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}
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tkQuit();
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}
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return final;
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}
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