C ++ Image Processing-PCX Format Image (bottom)

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C ++ Image Processing-PCX Format Image (I) converts a PCX format image to a GDI + bitmap. This article describes how to convert a GDI + bitmap to a PCX Format Image.

The following is the code for converting a GDI + bitmap to a PCX image:

Int packpcxline (lpbyte DEST, lpbyte source, int bytespreline, int planes) {lpbyte Pd = DEST; int Delta = planes --; lpbyte PS = source + planes; int bytes = bytespreline; while (planes> = 0) {int COUNT = 0; byte c = * pS; do {count ++; If (-- bytes = 0) {If (-- planes <0) break; bytes = bytespreline; PS = source + planes;} else PS + = delta ;} while (C = * PS & count <0x3f); If (C> = 0xc0 | count> 1) * PD ++ = cou NT | 0xc0; * PD ++ = C;} return Pd-Dest;} // revoke typedef Union {word value; struct {Byte Low; byte high ;};} testmask; int packpcx4line (lpbyte DEST, lpbyte source, int bytespreline, int width) {int bytes = bytespreline <2; lpbyte Buf = DEST + bytes; testmask mask; mask. value = 0x1001; width = (width + 1)> 1; while (mask. high) {byte C = 0; Te bit = 0x80; lpbyte Pb = Buf; For (INT I = 0; I <width; I ++) {If (source [I] & Mask. high) c | = bit; bit >>=1; If (source [I] & Mask. low) c | = bit; bit >>=1; If (bit = 0) {* pb ++ = C; C = 0; bit = 0x80 ;}} BUF + = bytespreline; mask. value <= 1;} return packpcxline (DEST, DEST + bytes, bytes, 1);} // define void argbquadtorgbtriple (prgbtriple d EST, prgbquad source, int count) {for (INT I = 0; I <count; I ++) {Dest [I]. rgbtblue = source [I]. rgbred; Dest [I]. rgbtgreen = source [I]. rgbgreen; Dest [I]. rgbtred = source [I]. rgbblue ;}}// your bool savepcximagetostream (istream * stream, bitmap * BMP) {pixelformat format = BMP-> getpixelformat (); If (format = pixelformatundefined) return Fal Se; pcxfileheader header; colorpalette * pal = NULL; byte palette [256*3 + 1]; zeromemory (& header, sizeof (pcxfileheader); header. bitsprepixel = getpixelformatsize (format); header. planes = 1; if (header. bitsprepixel> 8) {format = pixelformat24bpprgb; header. planes = 3; header. bitsprepixel = 8;} else // If (header. bitsprepixel> 1) {pal = (colorpalette *) New byte [256 * sizeof (argb) + sizeof (colorpalette)]; BMP-> Getpalette (PAL, BMP-> getpalettesize (); prgbtriple ppal = (prgbtriple) & palette [1]; // if it is a 16-color bitmap, save the palette to the file header if (format = pixelformat4bppindexed) {header. planes = header. bitsprepixel; header. bitsprepixel = 1; ppal = (prgbtriple) header. palette;} argbquadtorgbtriple (ppal, (prgbquad) Pal-> entries, pal-> count); Delete [] pal;} gdiplus: rect R (0, 0, BMP-> getwidth (), BMP-> getheight (); header. flag = 0x0a; header. versio N = 5; header. encodeing = 1; header. xmax = R. width-1; header. ymax = R. height-1; header. hres = 96; header. vres = 96; header. palettetype = 1; header. bytespreline = (R. width * header. bitsprepixel + 7)> 3; if (header. bytespreline & 1) header. bytespreline ++; // Save the PCX File Header if (Stream-> write (& header, sizeof (pcxfileheader), null )! = S_ OK) return false; // obtain the GDI + bitmap data in place graph data structure bitmapdata data; data. stride = (R. width * getpixelformatsize (Format) + 31) &-32)> 3; int size = R. height * data. stride; // size is the number of bytes of bitmap data, header. bytespreline * header. planes * 2 is the number of bytes in the encoding buffer. scan0 = (lpvoid) New byte [size + header. bytespreline * header. planes * 2]; BMP-> lockbits (& R, imagelockmoderead | imagelockmodeuserinputbuf, format, & data); BMP-> unlockbits (& data ); // if the first item of the monochrome bitmap palette is not 0, the bitmap data is reversed if (format = pixelformat1bppindexed & (* (argb *) & palette [1] & 0 xffffff )) {int COUNT = data. height * (data. stride> 2); lpdword Pd = (lpdword) data. scan0; For (INT I = 0; I <count; Pd [I] ^ = (DWORD) (-1), I ++);} lpbyte P = (lpbyte) data. scan0; lpbyte buffer = P + size; int bytes; // encode RLE row by row and save it to the stream for (uint y = 0; y <data. height; y ++, P + = data. stride) {If (format = pixelformat4bppindexed) bytes = packpcx4line (buffer, P, header. bytespreline, Data. width); elsebytes = packpcxline (buffer, P, header. bytespreline, header. planes); stream-> write (buffer, bytes, null);} Delete [] data. scan0; // if it is a 256-color bitmap, the color palette is saved to the end of the stream if (format = pixelformat8bppindexed) {palette [0] = 0x0c; stream-> write (palette, 256*3 + 1, null);} return true;} // describool savepcximagetofile (lptstr filename, bitmap * BMP) {istream * stream = new filestream (filename, false ); stream-> addref (); bool result = savepcximagetostream (stream, BMP); stream-> release (); return result;} // response ;}//---------------------------------------------------------------------------

In the code, the savepcximagetostream function has commented on the general conversion process. This article is no longer arrogant, the savepcximagetofile function still uses the simple file stream I wrote to save the converted PCX format image to the file, filestream is used in the previous Article C ++ Image Processing-PCX Format Image (I.

The following is an example of converting a GDI + bitmap to a PCX image (bcb2010 ):

void __fastcall TForm1::Button3Click(TObject *Sender){Gdiplus::Bitmap *bmp = new Gdiplus::Bitmap(L"d:\\1-4.bmp");if (bmp->GetLastStatus() != Ok)throw new Exception("Load Image fail");Gdiplus::Graphics *g = new Gdiplus::Graphics(Canvas->Handle);g->DrawImage(bmp, 0, 0);delete g;SavePcxImageToFile("d:\\1-4.pcx", bmp);delete bmp;}

Similarly, for the PCX file format, search for related documents online.

 

Due to limited levels, errors are inevitable. Correction and guidance are welcome. Email Address:Maozefa@hotmail.com

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