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