lhp: add DLO layout support

Add a dlo-based layout callback for use with lhp.

If lhp_dl_render() is used as the Lws Html/CSS parser callback, it
produces a display_list representation of the Html as DLOs, referencing the
appropriate CSS to drive the layout as best it can.

The display list can be rasterized on to an lws_display using the display's
state object

  lds->disp->blit(lds, (uint8_t *)&dl, &box);

CMakeLists-implied-options.txt

@@ -132,6 +132,7 @@ if (LWS_WITH_SECURE_STREAMS_PROXY_API)
 	set(LWS_WITH_LWS_DSH 1)
 	set(LWS_WITH_UNIX_SOCK 1)
 	set(LWS_WITH_SYS_SMD 1)
+	set(LWS_WITH_SECURE_STREAMS 1)
 endif()
 
 if (NOT LWS_WITH_NETWORK)
@@ -158,6 +159,7 @@ if (NOT LWS_WITH_NETWORK)
 	set(LWS_WITH_LWS_DSH 0)
 	set(LWS_WITH_THREADPOOL 0)
 	set(LWS_WITH_SYS_SMD 0)
+	set(LWS_WITH_LHP 0)
 endif()
 
 if (LWS_WITH_CGI)
@@ -363,8 +365,10 @@ endif()
 
 set(LWS_WITH_CLIENT 1)
 if (LWS_WITHOUT_CLIENT)
-	set(LWS_WITH_CLIENT)
+	set(LWS_WITH_CLIENT 0)
 	set(LWS_WITH_SECURE_STREAMS 0)
+	set(LWS_WITH_SECURE_STREAMS_PROXY_API 0)
+	set(LWS_WITH_LHP 0)
 endif()
 set(LWS_WITH_SERVER 1)
 if (LWS_WITHOUT_SERVER)
@@ -381,6 +385,11 @@ if (LWS_WITH_OTA)
 	set(LWS_WITH_GZINFATE 1)
 endif()
 
+if (LWS_WITH_LHP)
+	set(LWS_WITH_CLIENT 1)
+	set(LWS_WITH_SECURE_STREAMS 1)
+endif()
+
 # using any abstract protocol enables LWS_WITH_ABSTRACT
 
 #if (LWS_WITH_SMTP)

contrib/assets/LICENSE

@@ -0,0 +1,19 @@
+## Asset Provanance and licenses
+
+### bluecat.jpg.h
+
+Licence: CC0
+Source: https://commons.wikimedia.org/wiki/File:Startled_blue-eyed_cat_(Unsplash).jpg
+Archive: https://archive.is/Bi4tR
+
+### cat1.png.h
+
+License: CC0
+Source: https://commons.wikimedia.org/wiki/File:Cat_looking_outside_the_window.jpg
+Archive: https://archive.is/Rocwf
+
+### exclaim80.png.h & no-right.png.h
+
+License: CC0
+Source: [email protected] inkscape 
+

include/libwebsockets/lws-context-vhost.h

@@ -808,6 +808,9 @@ struct lws_context_creation_info {
 	 * proxy.  NULL means to use the default wsi-based client support */
 #endif
 
+#if defined(LWS_WITH_SECURE_STREAMS_PROXY_API)
+#endif
+
 	int rlimit_nofile;
 	/**< 0 = inherit the initial ulimit for files / sockets from the startup
 	 * environment.  Nonzero = try to set the limit for this process.

lib/core-net/vhost.c

@@ -1014,11 +1014,13 @@ lws_create_vhost(struct lws_context *context,
 		lwsl_vhost_err(vh, "lws_context_init_server_ssl failed");
 		goto bail1;
 	}
+#if defined(LWS_WITH_CLIENT)
 	if (lws_fi(&vh->fic, "vh_create_ssl_cli") ||
 	    lws_context_init_client_ssl(info, vh)) {
 		lwsl_vhost_err(vh, "lws_context_init_client_ssl failed");
 		goto bail1;
 	}
+#endif
 #if defined(LWS_WITH_SERVER)
 	lws_context_lock(context, __func__);
 	if (lws_fi(&vh->fic, "vh_create_srv_init"))

lib/core/alloc.c

@@ -178,6 +178,14 @@ _realloc(void *ptr, size_t size, const char *reason)
 		allocated -= malloc_usable_size(ptr);
 #endif
 		free(ptr);
+#if defined(LWS_PLAT_FREERTOS)
+		lwsl_debug("%s: free heap %d\n", __func__,
+#if defined(LWS_AMAZON_RTOS)
+			    (unsigned int)xPortGetFreeHeapSize() - (int)size);
+#else
+			    (unsigned int)esp_get_free_heap_size() - (int)size);
+#endif
+#endif
 	}
 
 	return NULL;

lib/misc/CMakeLists.txt

@@ -82,20 +82,26 @@ if (LWS_WITH_DLO)
 		misc/dlo/dlo-font-mcufont.c
 		misc/dlo/dlo-text.c)
 
-if (LWS_WITH_UPNG)
-	list(APPEND SOURCES
-		misc/dlo/dlo-png.c)
-endif()
+	if (LWS_WITH_SECURE_STREAMS AND LWS_WITH_CLIENT)
+		list(APPEND SOURCES
+			misc/dlo/dlo-ss.c)
+	endif()
 
-if (LWS_WITH_JPEG)
-	list(APPEND SOURCES
-		misc/dlo/dlo-jpeg.c)
-endif()
+	if (LWS_WITH_UPNG AND LWS_WITH_SECURE_STREAMS AND LWS_WITH_CLIENT)
+		list(APPEND SOURCES
+			misc/dlo/dlo-png.c)
+	endif()
 
-if (LWS_WITH_SECURE_STREAMS)
-	list(APPEND SOURCES
-		misc/dlo/dlo-ss.c)
-endif()
+	if (LWS_WITH_JPEG AND LWS_WITH_SECURE_STREAMS AND LWS_WITH_CLIENT)
+		list(APPEND SOURCES
+			misc/dlo/dlo-jpeg.c)
+	endif()
+
+	if (LWS_WITH_LHP AND LWS_WITH_DLO AND LWS_WITH_SECURE_STREAMS AND LWS_WITH_CLIENT)
+		list(APPEND SOURCES
+			misc/dlo/dlo-lhp.c
+		)
+	endif()
 
 endif()  #dlo