From 0f175e58d3a25830abad5e075e3e18619af0f6ff Mon Sep 17 00:00:00 2001
From: nick black <dankamongmen@gmail.com>
Date: Tue, 17 Dec 2019 00:33:51 -0500
Subject: [PATCH] unidamage PoC #117

---
 CMakeLists.txt        |  2 +-
 src/lib/notcurses.c   | 33 ++++++++++++++++++-------------
 src/poc/unidamage.cpp | 46 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 66 insertions(+), 15 deletions(-)
 create mode 100644 src/poc/unidamage.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 283ba795a..7b27cc332 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -79,7 +79,7 @@ target_compile_definitions(notcurses-demo
 )
 
 # tiny proofs of concept, one binary per source file
-file(GLOB POCSRCS CONFIGURE_DEPENDS src/poc/*.c)
+file(GLOB POCSRCS CONFIGURE_DEPENDS src/poc/*.c src/poc/*.cpp)
 foreach(f ${POCSRCS})
   get_filename_component(fe "${f}" NAME_WE)
   add_executable(${fe} ${f})
diff --git a/src/lib/notcurses.c b/src/lib/notcurses.c
index 6fa3aab9f..cf35a7c01 100644
--- a/src/lib/notcurses.c
+++ b/src/lib/notcurses.c
@@ -164,10 +164,19 @@ timespec_to_ns(const struct timespec* t){
 
 static void
 update_render_stats(const struct timespec* time1, const struct timespec* time0,
-                    ncstats* stats){
+                    ncstats* stats, int bytes){
   int64_t elapsed = timespec_to_ns(time1) - timespec_to_ns(time0);
   //fprintf(stderr, "Rendering took %ld.%03lds\n", elapsed / NANOSECS_IN_SEC,
   //        (elapsed % NANOSECS_IN_SEC) / 1000000);
+  if(bytes >= 0){
+    stats->render_bytes += bytes;
+    if(bytes > stats->render_max_bytes){
+      stats->render_max_bytes = bytes;
+    }
+    if(bytes < stats->render_min_bytes){
+      stats->render_min_bytes = bytes;
+    }
+  }
   if(elapsed > 0){ // don't count clearly incorrect information, egads
     ++stats->renders;
     stats->render_ns += elapsed;
@@ -806,8 +815,8 @@ int notcurses_stop(notcurses* nc){
     ret |= tcsetattr(nc->ttyfd, TCSANOW, &nc->tpreserved);
     if(nc->stats.renders){
       double avg = nc->stats.render_ns / (double)nc->stats.renders;
-      fprintf(stderr, "%ju renders, %.03gs total (%.03gs min, %.03gs max, %.02gs avg %.1f fps)\n",
-              nc->stats.renders,
+      fprintf(stderr, "%ju render%s, %.03gs total (%.03gs min, %.03gs max, %.02gs avg %.1f fps)\n",
+              nc->stats.renders, nc->stats.renders == 1 ? "" : "s",
               nc->stats.render_ns / 1000000000.0,
               nc->stats.render_min_ns / 1000000000.0,
               nc->stats.render_max_ns / 1000000000.0,
@@ -890,7 +899,12 @@ int ncplane_set_bg_alpha(ncplane *n, int alpha){
 }
 
 int ncplane_set_default(ncplane* ncp, const cell* c){
-  return cell_duplicate(ncp, &ncp->defcell, c);
+  int ret = cell_duplicate(ncp, &ncp->defcell, c);
+  if(ret < 0){
+    return -1;
+  }
+  ncplane_updamage(ncp);
+  return ret;
 }
 
 int ncplane_default(ncplane* ncp, cell* c){
@@ -1435,17 +1449,8 @@ int notcurses_render(notcurses* nc){
   int bytes = notcurses_render_internal(nc);
   int dimy, dimx;
   notcurses_resize(nc, &dimy, &dimx);
-  if(bytes > 0){
-    nc->stats.render_bytes += bytes;
-    if(bytes > nc->stats.render_max_bytes){
-      nc->stats.render_max_bytes = bytes;
-    }
-    if(bytes < nc->stats.render_min_bytes){
-      nc->stats.render_min_bytes = bytes;
-    }
-  }
   clock_gettime(CLOCK_MONOTONIC_RAW, &done);
-  update_render_stats(&done, &start, &nc->stats);
+  update_render_stats(&done, &start, &nc->stats, bytes);
   if(bytes < 0){
     ret = -1;
   }
diff --git a/src/poc/unidamage.cpp b/src/poc/unidamage.cpp
new file mode 100644
index 000000000..2e7da5a09
--- /dev/null
+++ b/src/poc/unidamage.cpp
@@ -0,0 +1,46 @@
+#include <cstdio>
+#include <cstdlib>
+#include <clocale>
+#include <cassert>
+#include <notcurses.h>
+
+// What happens when we print over half of a wide glyph?
+
+int main(int argc, char** argv){
+  setlocale(LC_ALL, "");
+  notcurses_options opts{};
+  opts.inhibit_alternate_screen = true;
+  struct notcurses* nc;
+  if((nc = notcurses_init(&opts, stdout)) == nullptr){
+    return EXIT_FAILURE;
+  }
+  struct ncplane* n = notcurses_stdplane(nc);
+  int dimx, dimy;
+  ncplane_dim_yx(n, &dimy, &dimx);
+  cell c = CELL_TRIVIAL_INITIALIZER;
+  if(cell_load(n, &c, "🐳") < 0){
+    goto err;
+  }
+  if(ncplane_set_default(n, &c) < 0){
+    goto err;
+  }
+  cell_release(n, &c);
+  if(cell_load(n, &c, "x") < 0){
+    goto err;
+  }
+  for(int i = 0 ; i < dimy ; ++i){
+    for(int j = 0 ; j < dimx / 2 ; j += 2){
+      if(ncplane_putc_yx(n, i, j, &c) < 0){
+        goto err;
+      }
+    }
+  }
+  if(notcurses_render(nc)){
+    goto err;
+  }
+  return notcurses_stop(nc) ? EXIT_FAILURE : EXIT_SUCCESS;
+
+err:
+  notcurses_stop(nc);
+  return EXIT_FAILURE;
+}