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support 16-bits per sample palette tiffs

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This commit is contained in:
John Cupitt 2014-04-09 15:28:47 +01:00
parent daf075112d
commit 3fe5d437ac
2 changed files with 40 additions and 8 deletions
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2
TODO
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@ -4,6 +4,8 @@
- why is cache in nip2 so slow? its awful
investigate again

46
libvips/foreign/tiff2vips.c
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@ -381,7 +381,8 @@ check_bits( ReadTiff *rtiff, int bits_per_sample )
static int
check_bits_palette( ReadTiff *rtiff )
{
if( rtiff->bits_per_sample != 8 &&
if( rtiff->bits_per_sample != 16 &&
rtiff->bits_per_sample != 8 &&
rtiff->bits_per_sample != 4 &&
rtiff->bits_per_sample != 2 &&
rtiff->bits_per_sample != 1 ) {
@ -729,11 +730,36 @@ palette_line( ReadTiff *rtiff, VipsPel *q, VipsPel *p, int n, void *client )
}
}
/* Read a palette-ised TIFF image. 1/2/4/8 bits only.
static void
palette_line16( ReadTiff *rtiff, VipsPel *q, VipsPel *p, int n, void *client )
{
PaletteRead *read = (PaletteRead *) client;
guint16 *data = (guint16 *) p;
int x;
for( x = 0; x < n; x++ ) {
int i = data[x];
if( read->mono ) {
q[0] = read->red[i];
q += 1;
}
else {
q[0] = read->red[i];
q[1] = read->green[i];
q[2] = read->blue[i];
q += 3;
}
}
}
/* Read a palette-ised TIFF image. 1/2/4/8/16 bits only.
*/
static int
parse_palette( ReadTiff *rtiff, VipsImage *out )
{
int len;
PaletteRead *read;
uint16 *tred, *tgreen, *tblue;
int i;
@ -741,11 +767,12 @@ parse_palette( ReadTiff *rtiff, VipsImage *out )
if( check_bits_palette( rtiff ) ||
check_samples( rtiff, 1 ) )
return( -1 );
len = 1 << rtiff->bits_per_sample;
if( !(read = VIPS_NEW( out, PaletteRead )) ||
!(read->red = VIPS_ARRAY( out, 256, VipsPel )) ||
!(read->green = VIPS_ARRAY( out, 256, VipsPel )) ||
!(read->blue = VIPS_ARRAY( out, 256, VipsPel )) )
!(read->red = VIPS_ARRAY( out, len, VipsPel )) ||
!(read->green = VIPS_ARRAY( out, len, VipsPel )) ||
!(read->blue = VIPS_ARRAY( out, len, VipsPel )) )
return( -1 );
/* Get maps, convert to 8-bit data.
@ -755,7 +782,7 @@ parse_palette( ReadTiff *rtiff, VipsImage *out )
vips_error( "tiff2vips", "%s", _( "bad colormap" ) );
return( -1 );
}
for( i = 0; i < (1 << rtiff->bits_per_sample); i++ ) {
for( i = 0; i < len; i++ ) {
read->red[i] = tred[i] >> 8;
read->green[i] = tgreen[i] >> 8;
read->blue[i] = tblue[i] >> 8;
@ -764,7 +791,7 @@ parse_palette( ReadTiff *rtiff, VipsImage *out )
/* Are all the maps equal? We have a mono image.
*/
read->mono = TRUE;
for( i = 0; i < (1 << rtiff->bits_per_sample); i++ )
for( i = 0; i < len; i++ )
if( read->red[i] != read->green[i] ||
read->green[i] != read->blue[i] ) {
read->mono = FALSE;
@ -789,7 +816,10 @@ parse_palette( ReadTiff *rtiff, VipsImage *out )
}
rtiff->client = read;
rtiff->sfn = palette_line;
if( rtiff->bits_per_sample == 16 )
rtiff->sfn = palette_line16;
else
rtiff->sfn = palette_line;
return( 0 );
}