88c3b3d8ed217d673a1879972d488f2303ea72f3
hiram
  Wed Jun 22 15:53:12 2011 -0700
properly recognize custom tracks, and allow close of bigWig files after load time
diff --git src/hg/hgTracks/bigWigTrack.c src/hg/hgTracks/bigWigTrack.c
index 32622c3..53bc1bd 100644
--- src/hg/hgTracks/bigWigTrack.c
+++ src/hg/hgTracks/bigWigTrack.c
@@ -1,139 +1,150 @@
 /* bigWigTrack - stuff to handle loading and display of bigWig type tracks in browser.   */
 
 #include "common.h"
 #include "hash.h"
 #include "linefile.h"
 #include "jksql.h"
 #include "hdb.h"
 #include "hgTracks.h"
 #include "localmem.h"
 #include "wigCommon.h"
 #include "bbiFile.h"
 #include "bigWig.h"
 #include "errCatch.h"
 #include "container.h"
 #include "bigWarn.h"
 
 struct preDrawContainer *bigWigLoadPreDraw(struct track *tg, int seqStart, int seqEnd, int width)
 /* Do bits that load the predraw buffer tg->preDrawContainer. */
 {
 /* Just need to do this once... */
 if (tg->preDrawContainer != NULL)
     return tg->preDrawContainer;
 
 struct preDrawContainer *preDrawList = NULL;
 /* protect against temporary network error */
 struct errCatch *errCatch = errCatchNew();
 if (errCatchStart(errCatch))
     {
     /* Allocate predraw area. */
 
     /* Get summary info from bigWig */
     int summarySize = width;
     struct bbiSummaryElement *summary;
     AllocArray(summary, summarySize);
 
     struct bbiFile *bbiFile ;
     for(bbiFile = tg->bbiFile; bbiFile ; bbiFile = bbiFile->next)
 	{
 	struct preDrawContainer *pre = initPreDrawContainer(width);
 	slAddHead(&preDrawList, pre);
 
 	if (bigWigSummaryArrayExtended(bbiFile, chromName, winStart, winEnd, summarySize, summary))
 	    {
 	    /* Convert format to predraw */
 	    int i;
 	    int preDrawZero = pre->preDrawZero;
 	    struct preDrawElement *preDraw = pre->preDraw;
 	    for (i=0; i<summarySize; ++i)
 		{
 		struct preDrawElement *pe = &preDraw[i + preDrawZero];
 		struct bbiSummaryElement *be = &summary[i];
 		pe->count = be->validCount;
 		pe->min = be->minVal;
 		pe->max = be->maxVal;
 		pe->sumData = be->sumData;
 		pe->sumSquares = be->sumSquares;
 		}
 	    }
 	}
     freeMem(summary);
     }
 errCatchEnd(errCatch);
 if (errCatch->gotError)
     {
     tg->networkErrMsg = cloneString(errCatch->message->string);
     }
 errCatchFree(&errCatch);
 tg->preDrawContainer = preDrawList;
 return preDrawList;
 }
 
 static void bigWigDrawItems(struct track *tg, int seqStart, int seqEnd,
 	struct hvGfx *hvg, int xOff, int yOff, int width,
 	MgFont *font, Color color, enum trackVisibility vis)
 {
-struct preDrawContainer *pre = bigWigLoadPreDraw(tg, seqStart, seqEnd, width);
+boolean canCloseHere = FALSE;
+struct preDrawContainer *pre = tg->customPt; // populated by bigWigLoadItems
+if (! pre)	// custom tracks could not do this at their load time
+    {
+    pre = bigWigLoadPreDraw(tg, seqStart, seqEnd, width);
+    canCloseHere = TRUE;
+    }
+
 if (tg->networkErrMsg == NULL)
     {
     /* Call actual graphing routine. */
     wigDrawPredraw(tg, seqStart, seqEnd, hvg, xOff, yOff, width, font, color, vis,
 		   pre, pre->preDrawZero, pre->preDrawSize, 
 		   &tg->graphUpperLimit, &tg->graphLowerLimit);
+    if (canCloseHere)
+	bigWigFileClose(&tg->bbiFile);
     }
 else
     bigDrawWarning(tg, seqStart, seqEnd, hvg, xOff, yOff, width, font, color, vis);
 }
 
 static void bigWigOpenCatch(struct track *tg, char *fileName)
 /* Try to open big wig file, store error in track struct */
 {
 /* protect against temporary network error */
 struct errCatch *errCatch = errCatchNew();
 if (errCatchStart(errCatch))
     {
     struct bbiFile *bbiFile = bigWigFileOpen(fileName);
     slAddHead(&tg->bbiFile, bbiFile);
     }
 errCatchEnd(errCatch);
 if (errCatch->gotError)
     {
     tg->networkErrMsg = cloneString(errCatch->message->string);
     tg->drawItems = bigDrawWarning;
     if (!sameOk(parentContainerType(tg), "multiWig"))
 	tg->totalHeight = bigWarnTotalHeight;
     }
 errCatchFree(&errCatch);
 }
 
 
 static void bigWigLoadItems(struct track *tg)
 /* Fill up tg->items with bedGraphItems derived from a bigWig file */
 {
 char *extTableString = trackDbSetting(tg->tdb, "extTable");
 
 if (tg->bbiFile == NULL)
     {
     /* Figure out bigWig file name. */
     struct sqlConnection *conn = hAllocConnTrack(database, tg->tdb);
     char *fileName = bbiNameFromSettingOrTable(tg->tdb, conn, tg->table);
     bigWigOpenCatch(tg, fileName);
     // if there's an extra table, read this one in too
     if (extTableString != NULL)
 	{
 	fileName = bbiNameFromSettingOrTable(tg->tdb, conn, extTableString);
         bigWigOpenCatch(tg, fileName);
 	}
     hFreeConn(&conn);
+    tg->customPt = (void *)bigWigLoadPreDraw(tg, winStart, winEnd, insideWidth);
+    bigWigFileClose(&tg->bbiFile);
     }
 }
 
 void bigWigMethods(struct track *track, struct trackDb *tdb, 
 	int wordCount, char *words[])
 /* Set up bigWig methods. */
 {
 bedGraphMethods(track, tdb, wordCount, words);
 track->loadItems = bigWigLoadItems;
 track->drawItems = bigWigDrawItems;
 track->loadPreDraw = bigWigLoadPreDraw;
 }