openslide2vips uses multiple parallel osr reads
open a separate openside_t for every read thread to try to get some
parallelism in decode
works, but no faster overall, since we don't ensure that each osr tile
is only fetched once --- threads need to synchronise and not overlap
we need:
- some way to get tile geometry from osr
- a threaded tilecache aligned to the osr tile boundaries
the tilecache needs to have locks and semaphores on every tile,
something like:
class tilecache:
def generate(region):
# lock all tiles we need, make a list of the ones that need
# calculating
work = []
for tile in region:
tile.lock()
if tile.nodata():
work.append(tile)
tile.set(:in-progress)
# calculate all empty tiles we need
for tile in work:
tile.calculate()
tile.set(:data)
# some tiles may be being made by another thread,
# wait for them to be done
for tile in region:
if tile.in-progress:
tile.wait()
# should all have data now, paste to output and unlock
for tile in region:
tile.paste(output)
tile.unlock()
return output
This commit is contained in:
John Cupitt
parent
6e6a2a455a
commit
4e0a433c24
@ -34,6 +34,9 @@
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* 20/9/12
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* - update openslide_open error handling for 3.3.0 semantics
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* - switch from deprecated _layer_ functions
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* 4/10/12
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* - open the image once for each thread, so we get some parallelism on
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* decode
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*/
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/*
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@ -87,6 +90,8 @@
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typedef struct {
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openslide_t *osr;
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char *filename;
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char *associated;
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/* Only valid if associated == NULL.
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@ -170,10 +175,11 @@ readslide_new( const char *filename, VipsImage *out,
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g_signal_connect( out, "close", G_CALLBACK( readslide_destroy_cb ),
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rslide );
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rslide->filename = g_strdup( filename );
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rslide->level = level;
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rslide->associated = g_strdup( associated );
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rslide->osr = openslide_open( filename );
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rslide->osr = openslide_open( rslide->filename );
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if( rslide->osr == NULL ) {
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vips_error( "openslide2vips",
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"%s", _( "unsupported slide format" ) );
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@ -259,38 +265,79 @@ vips__openslide_read_header( const char *filename, VipsImage *out,
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return( 0 );
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}
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/* One of these for each thread.
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*/
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typedef struct {
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openslide_t *osr;
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/* A mem buffer we can read to. This must be continuous.
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*/
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uint32_t *buf;
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size_t size;
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} Seq;
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static void *
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vips__openslide_start( VipsImage *out, void *_rslide, void *unused )
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{
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ReadSlide *rslide = _rslide;
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Seq *seq;
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if( !(seq = VIPS_NEW( out, Seq )) )
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return( NULL );
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seq->buf = NULL;
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if( !(seq->osr = openslide_open( rslide->filename )) ) {
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vips_error( "openslide2vips",
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"%s", _( "unsupported slide format" ) );
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return( NULL );
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}
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return( (void *) seq );
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}
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static int
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vips__openslide_generate( VipsRegion *out,
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void *seq, void *_rslide, void *unused, gboolean *stop )
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void *_seq, void *_rslide, void *unused, gboolean *stop )
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{
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Seq *seq = (Seq *) _seq;
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ReadSlide *rslide = _rslide;
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uint32_t bg = rslide->bg;
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VipsRect *r = &out->valid;
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int n = r->width * r->height;
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uint32_t *buf = (uint32_t *) VIPS_REGION_ADDR( out, r->left, r->top );
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uint32_t *p;
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const char *error;
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int i;
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int x, y;
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VIPS_DEBUG_MSG( "vips__openslide_generate: %dx%d @ %dx%d\n",
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r->width, r->height, r->left, r->top );
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/* Make sure our buffer is large enough.
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*/
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if( !seq->buf ||
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(size_t) r->width * r->height > seq->size ) {
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seq->size = (size_t) r->width * r->height;
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VIPS_FREE( seq->buf );
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if( !(seq->buf = (uint32_t *) VIPS_ARRAY( NULL, seq->size,
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uint32_t )) )
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return( -1 );
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}
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/* We're inside a cache, so requests should always be TILE_WIDTH by
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* TILE_HEIGHT pixels and on a tile boundary.
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*/
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g_assert( (r->left % TILE_WIDTH) == 0 );
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g_assert( (r->height % TILE_HEIGHT) == 0 );
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g_assert( r->width <= TILE_WIDTH );
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g_assert( r->height <= TILE_HEIGHT );
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*/
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openslide_read_region( rslide->osr,
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buf,
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openslide_read_region( seq->osr,
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seq->buf,
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r->left * rslide->downsample,
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r->top * rslide->downsample,
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rslide->level,
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r->width, r->height );
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error = openslide_get_error( rslide->osr );
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error = openslide_get_error( seq->osr );
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if( error ) {
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vips_error( "openslide2vips",
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_( "reading region: %s" ), error );
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@ -300,36 +347,51 @@ vips__openslide_generate( VipsRegion *out,
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/* Convert from ARGB to RGBA and undo premultiplication.
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*/
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for( i = 0; i < n; i++ ) {
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uint32_t x = buf[i];
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uint8_t a = x >> 24;
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VipsPel *out = (VipsPel *) (buf + i);
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for( p = seq->buf, y = 0; y < r->height; p += r->width, y++ ) {
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VipsPel *q = (VipsPel *)
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VIPS_REGION_ADDR( out, r->left, r->top + y );
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if( a != 0 ) {
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out[0] = 255 * ((x >> 16) & 255) / a;
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out[1] = 255 * ((x >> 8) & 255) / a;
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out[2] = 255 * (x & 255) / a;
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out[3] = a;
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}
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else {
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/* Use background color.
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*/
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out[0] = (bg >> 16) & 255;
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out[1] = (bg >> 8) & 255;
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out[2] = bg & 255;
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out[3] = 0;
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for( x = 0; x < r->width; x++ ) {
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uint32_t b = p[x];
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uint8_t a = x >> 24;
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if( a != 0 ) {
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q[0] = 255 * ((b >> 16) & 255) / a;
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q[1] = 255 * ((b >> 8) & 255) / a;
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q[2] = 255 * (b & 255) / a;
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q[3] = b;
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}
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else {
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/* Use background color.
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*/
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q[0] = (bg >> 16) & 255;
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q[1] = (bg >> 8) & 255;
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q[2] = bg & 255;
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q[3] = 0;
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}
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q += 4;
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}
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}
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return( 0 );
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}
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static int
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vips__openslide_stop( void *_seq, void *a, void *b )
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{
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Seq *seq = (Seq *) _seq;
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VIPS_FREEF( openslide_close, seq->osr );
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VIPS_FREE( seq->buf );
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return( 0 );
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}
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int
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vips__openslide_read( const char *filename, VipsImage *out, int level )
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{
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ReadSlide *rslide;
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VipsImage *raw;
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VipsImage *t;
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VIPS_DEBUG_MSG( "vips__openslide_read: %s %d\n",
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filename, level );
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@ -337,20 +399,27 @@ vips__openslide_read( const char *filename, VipsImage *out, int level )
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/* Tile cache: keep enough for two complete rows of tiles. OpenSlide
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* has its own tile cache, but it's not large enough for a complete
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* scan line.
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*/
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VipsImage *raw;
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VipsImage *t;
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raw = vips_image_new();
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vips_object_local( out, raw );
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if( !(rslide = readslide_new( filename, raw, level, NULL )) )
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return( -1 );
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*/
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if( vips_image_generate( raw,
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NULL, vips__openslide_generate, NULL, rslide, NULL ) )
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if( !(rslide = readslide_new( filename, out, level, NULL )) )
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return( -1 );
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if( vips_image_generate( out,
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vips__openslide_start,
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vips__openslide_generate,
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vips__openslide_stop,
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rslide, NULL ) )
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return( -1 );
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/* Copy to out, adding a cache. Enough tiles for a complete row, plus
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* 50%.
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*/
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if( vips_tilecache( raw, &t,
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"tile_width", TILE_WIDTH,
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"tile_height", TILE_WIDTH,
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@ -362,6 +431,7 @@ vips__openslide_read( const char *filename, VipsImage *out, int level )
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return( -1 );
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}
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g_object_unref( t );
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*/
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return( 0 );
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}
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