diff options
| -rw-r--r-- | src/ps_image.cxx | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/src/ps_image.cxx b/src/ps_image.cxx index 732c65d49..02dded8bf 100644 --- a/src/ps_image.cxx +++ b/src/ps_image.cxx @@ -50,22 +50,23 @@ static struct85 *prepare85(FILE *outfile) // prepare to produce ASCII85-encoded return big; } -static int convert85(const uchar *bytes4, uchar *chars5) // encodes 4 input bytes into chars5 array +// encodes 4 input bytes from bytes4 into chars5 array +// returns # of output chars +static int convert85(const uchar *bytes4, uchar *chars5) { - unsigned val = bytes4[0]*256*256*256 + bytes4[1]*256*256 + bytes4[2]*256 + bytes4[3]; - chars5[0] = val / 52200625; - val = val % 52200625; - chars5[1] = val / 614125; - val = val % 614125; - chars5[2] = val / 7225; - val = val % 7225; - chars5[3] = val / 85; - chars5[4] = val % 85; - if (chars5[0] == 0 && chars5[1] == 0 && chars5[2] == 0 && chars5[3] == 0 && chars5[4] == 0) { + if (bytes4[0] == 0 && bytes4[1] == 0 && bytes4[2] == 0 && bytes4[3] == 0) { chars5[0] = 'z'; return 1; } - chars5[0] += 33; chars5[1] += 33; chars5[2] += 33; chars5[3] += 33; chars5[4] += 33; + unsigned val = bytes4[0]*(256*256*256) + bytes4[1]*(256*256) + bytes4[2]*256 + bytes4[3]; + chars5[0] = val / 52200625 + 33; // 52200625 = 85 to the 4th + val = val % 52200625; + chars5[1] = val / 614125 + 33; // 614125 = 85 cube + val = val % 614125; + chars5[2] = val / 7225 + 33; // 7225 = 85 squared + val = val % 7225; + chars5[3] = val / 85 + 33; + chars5[4] = val % 85 + 33; return 5; } @@ -103,6 +104,10 @@ static void close85(struct85 *big) // stops ASCII85-encoding after processing r delete big; } +// +// End of implementation of the /ASCII85Encode PostScript filter +// + int Fl_PostScript_Graphics_Driver::alpha_mask(const uchar * data, int w, int h, int D, int LD){ |