xo-imgui: imgui_ex4 builds. font uploading works

xo-imgui/example/ex4/AnimateGcCopyCb.cpp

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+/* AnimateGcCopyCb.cpp */
+
+#include "AnimateGcCopyCb.hpp"
+
+void
+AnimateGcCopyCb::notify_gc_copy(std::size_t z,
+                                const void * src_addr,
+                                const void * dest_addr,
+                                generation src_gen,
+                                generation dest_gen)
+{
+    using xo::scope;
+    using xo::xtag;
+    using xo::gc::generation_result;
+    using xo::gc::generation;
+    using xo::gc::role;
+
+    scope log(XO_DEBUG(false),
+              xtag("z", z),
+              xtag("src", src_addr),
+              xtag("dest", dest_addr),
+              xtag("src_gen", src_gen),
+              xtag("dest_gen", dest_gen));
+
+    auto [src_gen2, src_offset, src_alloc, src_size] = p_app_state_->gc_->fromspace_location_of(src_addr);
+
+    if (src_gen2 == generation_result::not_found) {
+        auto [lo, hi] = p_app_state_->gc_->nursery_span(role::from_space);
+
+        log && log(xtag("N.from.lo", (void*)lo), xtag("N.from.hi", (void*)hi));
+
+        assert(false);
+    }
+
+    generation src_valid_gen = xo::gc::valid_genresult2gen(src_gen2);
+
+    auto [dest_gen2, dest_offset, _, dest_size] = p_app_state_->gc_->tospace_location_of(dest_addr);
+
+    generation dest_valid_gen = xo::gc::valid_genresult2gen(dest_gen2);
+
+    p_app_state_->copy_detail_v_.push_back(GcCopyDetail(z,
+                                                        src_valid_gen, src_offset, src_alloc,
+                                                        dest_valid_gen, dest_offset, dest_size));
+
+    if (dest_valid_gen == generation::nursery) {
+        p_app_state_->copy_detail_max_nursery_dest_offset_
+            = std::max(p_app_state_->copy_detail_max_nursery_dest_offset_, dest_offset);
+        p_app_state_->copy_detail_nursery_dest_size_
+            = std::max(p_app_state_->copy_detail_nursery_dest_size_, dest_size);
+    } else if (dest_valid_gen == generation::tenured) {
+        p_app_state_->copy_detail_max_tenured_dest_offset_
+            = std::max(p_app_state_->copy_detail_max_tenured_dest_offset_, dest_offset);
+        p_app_state_->copy_detail_tenured_dest_size_
+            = std::max(p_app_state_->copy_detail_tenured_dest_size_, dest_size);
+    }
+
+    /* will be animated across frames, see animate_gc_copy() */
+}
+
+/* AnimateGcCopyCb.cp */