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fix multi-page.tif load

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This commit is contained in:
John Cupitt 2016-11-19 10:41:22 +00:00
parent fd1c8d2732
commit 23e3fecdb0
1 changed files with 24 additions and 7 deletions
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31
libvips/foreign/tiff2vips.c
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@ -442,6 +442,10 @@ strip_read( TIFF *tiff, int strip, tdata_t buf )
{
tsize_t length;
#ifdef DEBUG
printf( "strip_read: reading strip %d\n", strip );
#endif /*DEBUG*/
length = TIFFReadEncodedStrip( tiff, strip, buf, (tsize_t) -1 );
if( length == -1 ) {
vips_error( "tiff2vips", "%s", _( "read error" ) );
@ -455,6 +459,10 @@ static int
rtiff_set_page( Rtiff *rtiff, int page )
{
if( rtiff->current_page != page ) {
#ifdef DEBUG
printf( "rtiff_set_page: selecting page %d\n", page );
#endif /*DEBUG*/
if( !TIFFSetDirectory( rtiff->tiff, page ) ) {
vips_error( "tiff2vips",
_( "TIFF does not contain page %d" ), page );
@ -1703,6 +1711,10 @@ rtiff_stripwise_generate( VipsRegion *or,
tstrip_t strip = y_page / rows_per_strip;
int y_strip = y_page % rows_per_strip;
/* Position of top of strip.
*/
int strip_y = strip * rows_per_strip;
/* strips are normally rows_per_strip in height, but they will
* be smaller for the last strip on the page.
*
@ -1715,12 +1727,12 @@ rtiff_stripwise_generate( VipsRegion *or,
* again in the next generate call, and only using the bottom
* half.
*/
int strip_height = VIPS_MIN( VIPS_MIN( rows_per_strip,
int strip_height = VIPS_MIN( VIPS_MIN( VIPS_MIN(
rows_per_strip,
page_height - y_page ),
strip_y + rows_per_strip - y_page ),
r->height - y );
tdata_t dst;
if( rtiff_set_page( rtiff, page ) ) {
VIPS_GATE_STOP( "rtiff_stripwise_generate: work" );
return( -1 );
@ -1732,8 +1744,9 @@ rtiff_stripwise_generate( VipsRegion *or,
* We need to read via a buffer if we need to reformat pixels,
* or if this strip is not aligned on a tile boundary.
*/
if( rtiff->memcpy ||
y_page % rows_per_strip != 0 ) {
if( rtiff->memcpy &&
y_page % rows_per_strip == 0 &&
strip_height == rows_per_strip ) {
if( rtiff_strip_read_interleaved( rtiff, strip,
VIPS_REGION_ADDR( or, 0, r->top + y ) ) ) {
VIPS_GATE_STOP(
@ -1929,7 +1942,11 @@ rtiff_new( VipsImage *out,
return( NULL );
}
if( rtiff->n < 1 || rtiff->n > 1000000 ) {
/* We allow n == -1, meaning all pages. It gets swapped for a real n
* value when we open the TIFF.
*/
if( rtiff->n != -1 &&
(rtiff->n < 1 || rtiff->n > 1000000) ) {
vips_error( "tiff2vips", _( "bad number of pages %d" ),
rtiff->n );
return( NULL );
@ -2063,7 +2080,7 @@ rtiff_header_read_all( Rtiff *rtiff )
/* -1 means "to the end".
*/
if( rtiff->n == -1 )
rtiff->n = rtiff->page - rtiff_n_pages( rtiff );
rtiff->n = rtiff_n_pages( rtiff ) - rtiff->page;
/* If we're to read many pages, verify that they are all identical.
*/