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Added support for alfa channel. Fixes

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http://bugzilla.remotesensing.org/show_bug.cgi?id=428
This commit is contained in:
Andrey Kiselev 2003-12-19 15:30:27 +00:00
parent bd57e28a64
commit 578b287f87
1 changed files with 63 additions and 7 deletions
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70
tools/tiff2ps.c
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@ -1,4 +1,4 @@
/* $Header: /cvs/maptools/cvsroot/libtiff/tools/tiff2ps.c,v 1.20 2003-10-17 21:25:51 dron Exp $ */
/* $Header: /cvs/maptools/cvsroot/libtiff/tools/tiff2ps.c,v 1.21 2003-12-19 15:30:27 dron Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -908,7 +908,7 @@ PS_Lvl2ImageDict(FILE* fd, TIFF* tif, uint32 w, uint32 h)
fprintf(fd, " /BitsPerComponent %d\n", bitspersample);
fprintf(fd, " /Interpolate %s\n", interpolate ? "true" : "false");
switch (samplesperpixel) {
switch (samplesperpixel - extrasamples) {
case 1:
switch (photometric) {
case PHOTOMETRIC_MINISBLACK:
@ -1249,6 +1249,35 @@ PS_Lvl2page(FILE* fd, TIFF* tif, uint32 w, uint32 h)
if (ascii85)
Ascii85Put('\0', fd);
}
/*
* For images with alpha, matte against a white background;
* i.e. Cback * (1 - Aimage) where Cback = 1. We will fill the
* lower part of the buffer with the modified values.
*
* XXX: needs better solution
*/
if (alpha) {
int adjust, i, j = 0;
int ncomps = samplesperpixel - extrasamples;
for (i = 0; i < byte_count; i+=samplesperpixel) {
adjust = 255 - buf_data[i + ncomps];
switch (ncomps) {
case 1:
buf_data[j++] = buf_data[i] + adjust;
break;
case 2:
buf_data[j++] = buf_data[i] + adjust;
buf_data[j++] = buf_data[i+1] + adjust;
break;
case 3:
buf_data[j++] = buf_data[i] + adjust;
buf_data[j++] = buf_data[i+1] + adjust;
buf_data[j++] = buf_data[i+2] + adjust;
break;
}
}
byte_count -= j;
}
if (ascii85) {
#if defined( EXP_ASCII85ENCODER )
@ -1308,7 +1337,7 @@ PSpage(FILE* fd, TIFF* tif, uint32 w, uint32 h)
if ((level2 || level3) && PS_Lvl2page(fd, tif, w, h))
return;
ps_bytesperrow = tf_bytesperrow;
ps_bytesperrow = tf_bytesperrow - (extrasamples * bitspersample / 8)*w;
switch (photometric) {
case PHOTOMETRIC_RGB:
if (planarconfiguration == PLANARCONFIG_CONTIG) {
@ -1620,6 +1649,15 @@ PSDataBW(FILE* fd, TIFF* tif, uint32 w, uint32 h)
}
if (ascii85) {
#if defined( EXP_ASCII85ENCODER )
if (alpha) {
int adjust, i;
for (i = 0; i < cc; i+=2) {
adjust = 255 - cp[i + 1];
cp[i / 2] = cp[i] + adjust;
}
cc /= 2;
}
ascii85_l = Ascii85EncodeBlock( ascii85_p, 1, cp, cc );
if ( ascii85_l > 0 )
@ -1629,10 +1667,28 @@ PSDataBW(FILE* fd, TIFF* tif, uint32 w, uint32 h)
Ascii85Put(*cp++, fd);
#endif /* EXP_ASCII85_ENCODER */
} else {
while (cc-- > 0) {
unsigned char c = *cp++;
DOBREAK(breaklen, 1, fd);
PUTHEX(c, fd);
unsigned char c;
if (alpha) {
int adjust;
while (cc-- > 0) {
DOBREAK(breaklen, 1, fd);
/*
* For images with alpha, matte against
* a white background; i.e.
* Cback * (1 - Aimage)
* where Cback = 1.
*/
adjust = 255 - cp[1];
c = *cp++ + adjust; PUTHEX(c,fd);
cp++, cc--;
}
} else {
while (cc-- > 0) {
c = *cp++;
DOBREAK(breaklen, 1, fd);
PUTHEX(c, fd);
}
}
}
}