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multi-page tiled read compiles 

need some test data though ... save next
This commit is contained in:
John Cupitt 2016-11-17 19:50:17 +00:00
parent 80e8c3f496
commit 75bc46c8b8
1 changed files with 30 additions and 14 deletions
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44
libvips/foreign/tiff2vips.c
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@ -1382,12 +1382,8 @@ rtiff_fill_region( VipsRegion *out, void *seq, void *a, void *b, gboolean *stop
/* Special case: we are filling a single tile exactly sized to match
* the tiff tile and we have no repacking to do for this format.
*
* This will also only work for single-page read. If we are reading
* from a many-page TIFF, all our tile alignment will break.
*/
if( rtiff->memcpy &&
rtiff->n == 1 &&
r->left % tile_width == 0 &&
r->top % tile_height == 0 &&
r->width == tile_width &&
@ -1399,26 +1395,46 @@ rtiff_fill_region( VipsRegion *out, void *seq, void *a, void *b, gboolean *stop
y = 0;
while( y < r->height ) {
VipsRect tile, page, hit;
x = 0;
while( x < r->width ) {
VipsRect tile;
VipsRect hit;
int page_no = rtiff->page + (r->top + y) /
rtiff->header.height;
int page_y = (r->top + y) % rtiff->header.height;
/* Read that tile.
/* Coordinate of the tile on this page that xy falls in.
*/
if( TIFFReadTile( rtiff->tiff, buf, x, y, 0, 0 ) < 0 ) {
int xs = ((r->left + x) / tile_width) * tile_width;
int ys = (page_y / tile_height) * tile_height;
if( rtiff_set_page( rtiff, page_no ) ||
TIFFReadTile( rtiff->tiff,
buf, xs, ys, 0, 0 ) < 0 ) {
VIPS_GATE_STOP( "rtiff_fill_region: work" );
return( -1 );
}
/* The tile we read.
/* Position of tile on the page.
*/
tile.left = x;
tile.top = y;
tile.left = xs;
tile.top = ys;
tile.width = tile_width;
tile.height = tile_height;
/* The section that hits the region we are building.
/* It'll be clipped by this page.
*/
page.left = 0;
page.top = 0;
page.width = rtiff->header.width;
page.height = rtiff->header.height;
vips_rect_intersectrect( &tile, &page, &tile );
/* To image coordinates.
*/
tile.top += page_no * rtiff->header.height;
/* And clip again by this region.
*/
vips_rect_intersectrect( &tile, r, &hit );
@ -1436,10 +1452,10 @@ rtiff_fill_region( VipsRegion *out, void *seq, void *a, void *b, gboolean *stop
q, p, hit.width, rtiff->client );
}
x += tile_width;
x += tile.width;
}
y += tile_height;
y += tile.height;
}
VIPS_GATE_STOP( "rtiff_fill_region: work" );