leptonica write bmp with pixWriteMemBmp function
Nereden Yazdırıldığı: Datakent
Kategori: Diğer bölümler
Forum Adı: C, C++, Visual C++
Forum Tanımlaması: C, C++, Visual C++ Örnekleri
URL: http://forum.datakent.com/forum_posts.asp?TID=2472
Tarih: 04.Kasim.2025 Saat 06:50
Konu: leptonica write bmp with pixWriteMemBmp function
Mesajı Yazan: aziz.alkurt
Konu: leptonica write bmp with pixWriteMemBmp function
Mesaj Tarihi: 16.Aralik.2012 Saat 17:26
leptonica - bmpio.c
//----------------------------------------------------------------------------------------------------------------------
l_int32
pixWriteMemBmp(l_uint8 **pdata,
size_t *psize,
PIX *pix)
{
l_uint32 offbytes, filebytes, fileimagebytes;
l_int32 width, height, depth, d, xres, yres;
l_uint16 bfType, bfSize, bfFill1, bfReserved1, bfReserved2;
l_uint16 bfOffBits, bfFill2, biPlanes, biBitCount;
l_uint16 sval;
l_uint32 biSize, biWidth, biHeight, biCompression, biSizeImage;
l_uint32 biXPelsPerMeter, biYPelsPerMeter, biClrUsed, biClrImportant;
l_int32 pixWpl, pixBpl, extrabytes, writeerror;
l_int32 fileBpl, fileWpl;
l_int32 i, j, k;
l_int32 heapcm; /* extra copy of cta on the heap ? 1 : 0 */
l_uint8 *data;
l_uint8 pel[4];
l_uint32 *line, *pword;
PIXCMAP *cmap;
l_uint8 *cta; /* address of the bmp color table array */
l_int32 cmaplen; /* number of bytes in the bmp colormap */
l_int32 ncolors, val, stepsize;
RGBA_QUAD *pquad;
l_uint8 *pdataTMP;
unsigned int hacked;
PROCNAME("pixWriteMemBmp");
if (!pix)
return ERROR_INT("pix not defined", procName, 1);
width = pixGetWidth(pix);
height = pixGetHeight(pix);
d = pixGetDepth(pix);
if (d == 2)
L_WARNING("writing 2 bpp bmp file; nobody else can read", procName);
depth = d;
if (d == 32)
depth = 24;
xres = (l_int32)(39.37 * (l_float32)pixGetXRes(pix) + 0.5); /* to ppm */
yres = (l_int32)(39.37 * (l_float32)pixGetYRes(pix) + 0.5); /* to ppm */
pixWpl = pixGetWpl(pix);
pixBpl = 4 * pixWpl;
fileWpl = (width * depth + 31) / 32;
fileBpl = 4 * fileWpl;
fileimagebytes = height * fileBpl;
heapcm = 0;
if (d == 32) { /* 24 bpp rgb; no colormap */
ncolors = 0;
cmaplen = 0;
}
else if ((cmap = pixGetColormap(pix))) { /* existing colormap */
ncolors = pixcmapGetCount(cmap);
cmaplen = ncolors * sizeof(RGBA_QUAD);
cta = (l_uint8 *)cmap->array;
}
else { /* no existing colormap; make a binary or gray one */
if (d == 1) {
cmaplen = sizeof(bwmap);
ncolors = 2;
cta = (l_uint8 *)bwmap;
}
else { /* d != 32; output grayscale version */
ncolors = 1 << depth;
cmaplen = ncolors * sizeof(RGBA_QUAD);
heapcm = 1;
if ((cta = (l_uint8 *)CALLOC(cmaplen, 1)) == NULL)
return ERROR_INT("colormap alloc fail", procName, 1);
stepsize = 255 / (ncolors - 1);
for (i = 0, val = 0, pquad = (RGBA_QUAD *)cta;
i < ncolors;
i++, val += stepsize, pquad++) {
pquad->blue = pquad->green = pquad->red = val;
}
}
}
/* Convert to little-endian and write the file header data */
bfType = convertOnBigEnd16(BMP_ID);
offbytes = BMP_FHBYTES + BMP_IHBYTES + cmaplen;
filebytes = offbytes + fileimagebytes;
*psize=filebytes;
pdataTMP=(unsigned char*) malloc (sizeof(unsigned char)*filebytes);
sval = filebytes & 0x0000ffff;
bfSize = convertOnBigEnd16(sval);
sval = (filebytes >> 16) & 0x0000ffff;
bfFill1 = convertOnBigEnd16(sval);
bfReserved1 = 0;
bfReserved2 = 0;
sval = offbytes & 0x0000ffff;
bfOffBits = convertOnBigEnd16(sval);
sval = (offbytes >> 16) & 0x0000ffff;
bfFill2 = convertOnBigEnd16(sval);
memcpy(pdataTMP,&bfType,2);
memcpy(pdataTMP+2,&bfSize,2);
memcpy(pdataTMP+4,&bfFill1,2);
memcpy(pdataTMP+6,&bfReserved1,2);
memcpy(pdataTMP+8,&bfReserved1,2);
memcpy(pdataTMP+10,&bfOffBits,2);
memcpy(pdataTMP+12,&bfFill2,2);
/* Convert to little-endian and write the info header data */
biSize = convertOnBigEnd32(BMP_IHBYTES);
biWidth = convertOnBigEnd32(width);
biHeight = convertOnBigEnd32(height);
biPlanes = convertOnBigEnd16(1);
biBitCount = convertOnBigEnd16(depth);
biCompression = 0;
biSizeImage = convertOnBigEnd32(fileimagebytes);
biXPelsPerMeter = convertOnBigEnd32(xres);
biYPelsPerMeter = convertOnBigEnd32(yres);
biClrUsed = convertOnBigEnd32(ncolors);
biClrImportant = convertOnBigEnd32(ncolors);
memcpy(pdataTMP+14,&biSize,4);
memcpy(pdataTMP+18,&biWidth,4);
memcpy(pdataTMP+22,&biHeight,4);
memcpy(pdataTMP+26,&biPlanes,2);
memcpy(pdataTMP+28,&biBitCount,2);
memcpy(pdataTMP+30,&biCompression,4);
memcpy(pdataTMP+34,&biSizeImage,4);
memcpy(pdataTMP+38,&biXPelsPerMeter,4);
memcpy(pdataTMP+42,&biYPelsPerMeter,4);
memcpy(pdataTMP+46,&biClrUsed,4);
memcpy(pdataTMP+50,&biClrImportant,4);
hacked=54;
/* Write the colormap data */
if (ncolors > 0)
{
memcpy(pdataTMP+hacked,cta,cmaplen);
if (heapcm)
FREE(cta);
hacked+=cmaplen;
}
/* When you write a binary image with a colormap
* that sets BLACK to 0, you must invert the data */
if (depth == 1 && cmap && ((l_uint8 *)(cmap->array))[0] == 0x0) {
pixInvert(pix, pix);
}
pixEndianByteSwap(pix);
writeerror = 0;
if (depth != 24)
{ /* typ 1 or 8 bpp */
data = (l_uint8 *)pixGetData(pix) + pixBpl * (height - 1);
for (i = 0; i < height; i++)
{
memcpy(pdataTMP+hacked,data,fileBpl);
hacked+=fileBpl;
data -= pixBpl;
}
}
else { /* 32 bpp pix; 24 bpp file
* See the comments in pixReadStreamBMP() to
* understand the logic behind the pixel ordering below.
* Note that we have again done an endian swap on
* little endian machines before arriving here, so that
* the bytes are ordered on both platforms as:
Red Green Blue --
|-----------|------------|-----------|-----------|
*/
extrabytes = fileBpl - 3 * width;
line = pixGetData(pix) + pixWpl * (height - 1);
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
pword = line + j;
pel[2] = *((l_uint8 *)pword + COLOR_RED);
pel[1] = *((l_uint8 *)pword + COLOR_GREEN);
pel[0] = *((l_uint8 *)pword + COLOR_BLUE);
memcpy(pdataTMP+hacked,&pel,3);
hacked+=3;
}
if (extrabytes) {
memcpy(pdataTMP+hacked,&pel,3);
hacked+=extrabytes;
}
line -= pixWpl;
}
}
/* Restore to original state */
pixEndianByteSwap(pix);
if (depth == 1 && cmap && ((l_uint8 *)(cmap->array))[0] == 0x0)
pixInvert(pix, pix);
if (writeerror)
return ERROR_INT("image write fail", procName, 1);
*pdata = (l_uint8*)pdataTMP;
return 0;
}
//----------------------------------------------------------------------------------------------------------------------
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