render: fix bad reference in final pass

src/lib/render.c

@@ -287,12 +287,13 @@ paint(notcurses* nc, ncplane* p, struct crender* rvec, cell* fb){
 
       if(cell_locked_p(targc)){
         cell* prevcell = &nc->lastframe[fbcellidx(absy, nc->lfdimx, absx)];
-        if(cellcmp_and_dupfar(&nc->pool, prevcell, crender->p, targc)){
-/*if(cell_simple_p(prevcell)){
-fprintf(stderr, "WROTE %u [%c] to %d/%d (%d/%d)\n", prevcell->gcluster, prevcell->gcluster, y, x, absy, absx);
+/*if(cell_simple_p(targc)){
+fprintf(stderr, "WROTE %u [%c] to %d/%d (%d/%d)\n", targc->gcluster, prevcell->gcluster, y, x, absy, absx);
 }else{
-fprintf(stderr, "WROTE %u [%s] to %d/%d (%d/%d)\n", prevcell->gcluster, egcpool_extended_gcluster(&nc->pool, prevcell), y, x, absy, absx);
-}*/
+fprintf(stderr, "WROTE %u [%s] to %d/%d (%d/%d)\n", targc->gcluster, extended_gcluster(crender->p, targc), y, x, absy, absx);
+}
+fprintf(stderr, "POOL: %p NC: %p SRC: %p\n", nc->pool.pool, nc, crender->p);*/
+        if(cellcmp_and_dupfar(&nc->pool, prevcell, crender->p, targc)){
           crender->damaged = true;
           if(cell_double_wide_p(targc)){
             ncplane* tmpp = crender->p;
@@ -354,7 +355,7 @@ notcurses_render_internal(notcurses* nc, struct crender* rvec){
         if(targc->gcluster == 0){
           targc->gcluster = ' ';
         }
-        if(cellcmp_and_dupfar(&nc->pool, prevcell, rvec->p, targc)){
+        if(cellcmp_and_dupfar(&nc->pool, prevcell, rvec[fbcellidx(y, dimx, x)].p, targc)){
           struct crender* crender = &rvec[fbcellidx(y, dimx, x)];
           crender->damaged = true;
         }

tests/libav.cpp

@@ -21,7 +21,6 @@ TEST_CASE("Multimedia") {
   ncplane* ncp_ = notcurses_stdplane(nc_);
   REQUIRE(ncp_);
 
-  /*
 #ifdef DISABLE_FFMPEG
   SUBCASE("LibavDisabled"){
     REQUIRE(!notcurses_canopen(nc_));
@@ -31,6 +30,26 @@ TEST_CASE("Multimedia") {
     REQUIRE(notcurses_canopen(nc_));
   }
 
+  SUBCASE("LoadImageCreatePlane") {
+    int averr;
+    int dimy, dimx;
+    ncplane_dim_yx(ncp_, &dimy, &dimx);
+    auto ncv = ncvisual_open_plane(nc_, find_data("dsscaw-purp.png"), &averr, 0, 0, NCSCALE_STRETCH);
+    REQUIRE(ncv);
+    REQUIRE(0 == averr);
+    auto frame = ncvisual_decode(ncv, &averr);
+    REQUIRE(frame);
+    REQUIRE(0 == averr);
+    CHECK(dimy * 2 == frame->height);
+    CHECK(dimx == frame->width);
+    CHECK(0 == ncvisual_render(ncv, 0, 0, 0, 0));
+    CHECK(0 == notcurses_render(nc_));
+    frame = ncvisual_decode(ncv, &averr);
+    REQUIRE_EQ(nullptr, frame);
+    CHECK(AVERROR_EOF == averr);
+    ncvisual_destroy(ncv);
+  }
+
   SUBCASE("LoadImage") {
     int averr;
     int dimy, dimx;
@@ -86,7 +105,6 @@ TEST_CASE("Multimedia") {
     ncvisual_destroy(ncv);
   }
 #endif
-*/
 
   CHECK(!notcurses_stop(nc_));
   CHECK(!fclose(outfp_));