380 lines
11 KiB
C
380 lines
11 KiB
C
/*************************************************************************
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*
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* Source file for Windows 95/Win32.
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*
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* The function LoadTIFFinDIB in this source file let you load
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* a TIFF file and build a memory DIB with it and return the
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* HANDLE (HDIB) of the memory bloc containing the DIB.
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*
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* Example :
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*
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* HDIB hDIB;
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* hDIB = LoadTIFFinDIB("sample.tif");
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*
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*
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* To build this source file you must include the TIFF library
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* in your project.
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*
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* 4/12/95 Philippe Tenenhaus 100423.3705@compuserve.com
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*
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************************************************************************/
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#include "tiffio.h"
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#define HDIB HANDLE
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#define IS_WIN30_DIB(lpbi) ((*(LPDWORD)(lpbi)) == sizeof(BITMAPINFOHEADER))
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#define CVT(x) (((x) * 255L) / ((1L<<16)-1))
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static HDIB CreateDIB(DWORD dwWidth, DWORD dwHeight, WORD wBitCount);
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static LPSTR FindDIBBits(LPSTR lpDIB);
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static WORD PaletteSize(LPSTR lpDIB);
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static WORD DIBNumColors(LPSTR lpDIB);
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static int checkcmap(int n, uint16* r, uint16* g, uint16* b);
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/*************************************************************************
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*
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* HDIB LoadTIFFinDIB(LPSTR lpFileName)
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*
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* Parameter:
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*
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* LPSTR lpDIB - File name of a tiff imag
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*
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* Return Value:
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*
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* LPSTR - HANDLE of a DIB
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*
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* Description:
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*
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* This function load a TIFF file and build a memory DIB with it
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* and return the HANDLE (HDIB) of the memory bloc containing
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* the DIB.
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*
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* 4/12/95 Philippe Tenenhaus 100423.3705@compuserve.com
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*
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************************************************************************/
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HDIB LoadTIFFinDIB(LPSTR lpFileName)
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{
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TIFF *tif;
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unsigned long imageLength;
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unsigned long imageWidth;
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unsigned int BitsPerSample;
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unsigned long LineSize;
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unsigned int SamplePerPixel;
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unsigned long RowsPerStrip;
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int PhotometricInterpretation;
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long nrow;
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unsigned long row;
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char *buf;
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LPBITMAPINFOHEADER lpDIB;
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HDIB hDIB;
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char *lpBits;
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HGLOBAL hStrip;
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int i,l;
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int Align;
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tif = TIFFOpen(lpFileName, "r");
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if (!tif)
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goto TiffOpenError;
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TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &imageWidth);
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TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &imageLength);
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TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &BitsPerSample);
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TIFFGetField(tif, TIFFTAG_ROWSPERSTRIP, &RowsPerStrip);
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TIFFGetField(tif, TIFFTAG_ROWSPERSTRIP, &RowsPerStrip);
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TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &PhotometricInterpretation);
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LineSize = TIFFScanlineSize(tif); //Number of byte in ine line
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SamplePerPixel = (int) (LineSize/imageWidth);
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//Align = Number of byte to add at the end of each line of the DIB
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Align = 4 - (LineSize % 4);
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if (Align == 4) Align = 0;
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//Create a new DIB
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hDIB = CreateDIB((DWORD) imageWidth, (DWORD) imageLength, (WORD)
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(BitsPerSample*SamplePerPixel));
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lpDIB = (LPBITMAPINFOHEADER) GlobalLock(hDIB);
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if (!lpDIB)
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goto OutOfDIBMemory;
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if (lpDIB)
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lpBits = FindDIBBits((LPSTR) lpDIB);
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//In the tiff file the lines are save from up to down
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//In a DIB the lines must be save from down to up
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if (lpBits)
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{
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lpBits = FindDIBBits((LPSTR) lpDIB);
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lpBits+=((imageWidth*SamplePerPixel)+Align)*(imageLength-1);
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//now lpBits pointe on the bottom line
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hStrip = GlobalAlloc(GHND,TIFFStripSize(tif));
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buf = GlobalLock(hStrip);
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if (!buf)
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goto OutOfBufMemory;
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//PhotometricInterpretation = 2 image is RGB
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//PhotometricInterpretation = 3 image have a color palette
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if (PhotometricInterpretation == 3)
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{
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uint16* red;
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uint16* green;
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uint16* blue;
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int16 i;
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LPBITMAPINFO lpbmi;
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int Palette16Bits;
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TIFFGetField(tif, TIFFTAG_COLORMAP, &red, &green, &blue);
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//Is the palette 16 or 8 bits ?
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if (checkcmap(1<<BitsPerSample, red, green, blue) == 16)
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Palette16Bits = TRUE;
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else
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Palette16Bits = FALSE;
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lpbmi = (LPBITMAPINFO)lpDIB;
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//load the palette in the DIB
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for (i = (1<<BitsPerSample)-1; i >= 0; i--)
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{
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if (Palette16Bits)
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{
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lpbmi->bmiColors[i].rgbRed =(BYTE) CVT(red[i]);
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lpbmi->bmiColors[i].rgbGreen = (BYTE) CVT(green[i]);
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lpbmi->bmiColors[i].rgbBlue = (BYTE) CVT(blue[i]);
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}
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else
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{
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lpbmi->bmiColors[i].rgbRed = (BYTE) red[i];
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lpbmi->bmiColors[i].rgbGreen = (BYTE) green[i];
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lpbmi->bmiColors[i].rgbBlue = (BYTE) blue[i];
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}
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}
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}
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//read the tiff lines and save them in the DIB
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//with RGB mode, we have to change the order of the 3 samples RGB
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<=> BGR
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for (row = 0; row < imageLength; row += RowsPerStrip)
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{
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nrow = (row + RowsPerStrip > imageLength ? imageLength - row :
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RowsPerStrip);
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if (TIFFReadEncodedStrip(tif, TIFFComputeStrip(tif, row, 0),
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buf, nrow*LineSize)==-1)
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{
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goto TiffReadError;
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}
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else
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{
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for (l = 0; l < nrow; l++)
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{
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if (SamplePerPixel == 3)
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for (i=0;i< (int) (imageWidth);i++)
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{
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lpBits[i*SamplePerPixel+0]=buf[l*LineSize+i*Sample
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PerPixel+2];
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lpBits[i*SamplePerPixel+1]=buf[l*LineSize+i*Sample
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PerPixel+1];
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lpBits[i*SamplePerPixel+2]=buf[l*LineSize+i*Sample
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PerPixel+0];
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}
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else
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memcpy(lpBits, &buf[(int) (l*LineSize)], (int)
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imageWidth*SamplePerPixel);
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lpBits-=imageWidth*SamplePerPixel+Align;
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}
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}
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}
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GlobalUnlock(hStrip);
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GlobalFree(hStrip);
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GlobalUnlock(hDIB);
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TIFFClose(tif);
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}
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return hDIB;
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OutOfBufMemory:
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TiffReadError:
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GlobalUnlock(hDIB);
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GlobalFree(hStrip);
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OutOfDIBMemory:
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TIFFClose(tif);
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TiffOpenError:
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return (HANDLE) 0;
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}
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static int checkcmap(int n, uint16* r, uint16* g, uint16* b)
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{
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while (n-- > 0)
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if (*r++ >= 256 || *g++ >= 256 || *b++ >= 256)
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return (16);
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return (8);
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}
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/*************************************************************************
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* All the following functions were created by microsoft, they are
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* parts of the sample project "wincap" given with the SDK Win32.
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*
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* Microsoft says that :
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*
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* You have a royalty-free right to use, modify, reproduce and
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* distribute the Sample Files (and/or any modified version) in
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* any way you find useful, provided that you agree that
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* Microsoft has no warranty obligations or liability for any
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* Sample Application Files which are modified.
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*
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************************************************************************/
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HDIB CreateDIB(DWORD dwWidth, DWORD dwHeight, WORD wBitCount)
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{
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BITMAPINFOHEADER bi; // bitmap header
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LPBITMAPINFOHEADER lpbi; // pointer to BITMAPINFOHEADER
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DWORD dwLen; // size of memory block
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HDIB hDIB;
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DWORD dwBytesPerLine; // Number of bytes per scanline
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// Make sure bits per pixel is valid
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if (wBitCount <= 1)
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wBitCount = 1;
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else if (wBitCount <= 4)
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wBitCount = 4;
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else if (wBitCount <= 8)
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wBitCount = 8;
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else if (wBitCount <= 24)
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wBitCount = 24;
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else
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wBitCount = 4; // set default value to 4 if parameter is bogus
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// initialize BITMAPINFOHEADER
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bi.biSize = sizeof(BITMAPINFOHEADER);
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bi.biWidth = dwWidth; // fill in width from parameter
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bi.biHeight = dwHeight; // fill in height from parameter
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bi.biPlanes = 1; // must be 1
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bi.biBitCount = wBitCount; // from parameter
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bi.biCompression = BI_RGB;
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bi.biSizeImage = (dwWidth*dwHeight*wBitCount)/8; //0; // 0's here
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mean "default"
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bi.biXPelsPerMeter = 2834; //0;
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bi.biYPelsPerMeter = 2834; //0;
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bi.biClrUsed = 0;
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bi.biClrImportant = 0;
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// calculate size of memory block required to store the DIB. This
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// block should be big enough to hold the BITMAPINFOHEADER, the color
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// table, and the bits
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dwBytesPerLine = (((wBitCount * dwWidth) + 31) / 32 * 4);
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dwLen = bi.biSize + PaletteSize((LPSTR)&bi) + (dwBytesPerLine * dwHeight);
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// alloc memory block to store our bitmap
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hDIB = GlobalAlloc(GHND, dwLen);
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// major bummer if we couldn't get memory block
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if (!hDIB)
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{
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return NULL;
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}
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// lock memory and get pointer to it
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lpbi = (VOID FAR *)GlobalLock(hDIB);
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// use our bitmap info structure to fill in first part of
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// our DIB with the BITMAPINFOHEADER
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*lpbi = bi;
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// Since we don't know what the colortable and bits should contain,
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// just leave these blank. Unlock the DIB and return the HDIB.
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GlobalUnlock(hDIB);
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/* return handle to the DIB */
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return hDIB;
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}
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LPSTR FAR FindDIBBits(LPSTR lpDIB)
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{
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return (lpDIB + *(LPDWORD)lpDIB + PaletteSize(lpDIB));
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}
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WORD FAR PaletteSize(LPSTR lpDIB)
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{
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/* calculate the size required by the palette */
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if (IS_WIN30_DIB (lpDIB))
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return (DIBNumColors(lpDIB) * sizeof(RGBQUAD));
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else
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return (DIBNumColors(lpDIB) * sizeof(RGBTRIPLE));
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}
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WORD DIBNumColors(LPSTR lpDIB)
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{
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WORD wBitCount; // DIB bit count
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/* If this is a Windows-style DIB, the number of colors in the
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* color table can be less than the number of bits per pixel
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* allows for (i.e. lpbi->biClrUsed can be set to some value).
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* If this is the case, return the appropriate value.
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*/
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if (IS_WIN30_DIB(lpDIB))
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{
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DWORD dwClrUsed;
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dwClrUsed = ((LPBITMAPINFOHEADER)lpDIB)->biClrUsed;
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if (dwClrUsed)
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return (WORD)dwClrUsed;
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}
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/* Calculate the number of colors in the color table based on
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* the number of bits per pixel for the DIB.
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*/
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if (IS_WIN30_DIB(lpDIB))
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wBitCount = ((LPBITMAPINFOHEADER)lpDIB)->biBitCount;
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else
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wBitCount = ((LPBITMAPCOREHEADER)lpDIB)->bcBitCount;
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/* return number of colors based on bits per pixel */
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switch (wBitCount)
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{
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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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return 0;
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}
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}
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 8
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* fill-column: 78
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* End:
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*/
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