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feat: add a simple standalone version of graphviz #296

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25 changes: 13 additions & 12 deletions packages/graphviz/src-cpp/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -51,11 +51,21 @@ add_executable(graphvizlib
set_target_properties(graphvizlib PROPERTIES COMPILE_FLAGS "${CPP_FLAGS}")
set_target_properties(graphvizlib PROPERTIES LINK_FLAGS "${LINK_FLAGS}")

add_executable(graphvizlib-standalone
main-standalone.cpp
util.hpp
util.cpp
)

set_target_properties(graphvizlib-standalone PROPERTIES COMPILE_FLAGS "")
set_target_properties(graphvizlib-standalone PROPERTIES LINK_FLAGS "--no-entry -s STANDALONE_WASM -s EXPORTED_FUNCTIONS=\"['_free', '_malloc', '_layout', '_lastError']\"")

# link libraries
function(add_graphviz_library library)
find_library(GRAPHVIZ_${library} NAMES ${library})
if(GRAPHVIZ_${library})
target_link_libraries(graphvizlib PRIVATE ${GRAPHVIZ_${library}})
target_link_libraries(graphvizlib-standalone PRIVATE ${GRAPHVIZ_${library}})
else()
message(FATAL_ERROR "Could not find library ${library}!")
endif()
Expand Down Expand Up @@ -90,18 +100,9 @@ target_link_libraries(graphvizlib PRIVATE
${EXPAT_LIBRARIES}
)

# add_executable(graphvizlib-web
# ${SRCS}
# )

# set_target_properties(graphvizlib-web PROPERTIES LINK_FLAGS "${LINK_FLAGS} -s ENVIRONMENT=web")

# target_link_libraries(graphvizlib-web PRIVATE
# gvplugin_core
# gvplugin_dot_layout
# gvplugin_neato_layout
# ortho
# )
target_link_libraries(graphvizlib-standalone PRIVATE
${EXPAT_LIBRARIES}
)

# add_executable(graphvizlib-worker
# ${SRCS}
Expand Down
84 changes: 84 additions & 0 deletions packages/graphviz/src-cpp/main-standalone.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,84 @@
#include "util.hpp"

#include <gvc.h>
#include <gvplugin.h>
#include <graphviz_version.h>

#include <emscripten.h>

extern gvplugin_library_t gvplugin_dot_layout_LTX_library;
extern gvplugin_library_t gvplugin_neato_layout_LTX_library;
#ifdef HAVE_LIBGD
extern gvplugin_library_t gvplugin_gd_LTX_library;
#endif
#ifdef HAVE_PANGOCAIRO
extern gvplugin_library_t gvplugin_pango_LTX_library;
#ifdef HAVE_WEBP
extern gvplugin_library_t gvplugin_webp_LTX_library;
#endif
#endif
extern gvplugin_library_t gvplugin_core_LTX_library;

lt_symlist_t lt_preloaded_symbols[] = {
{"gvplugin_dot_layout_LTX_library", &gvplugin_dot_layout_LTX_library},
{"gvplugin_neato_layout_LTX_library", &gvplugin_neato_layout_LTX_library},
#ifdef HAVE_PANGOCAIRO
{"gvplugin_pango_LTX_library", &gvplugin_pango_LTX_library},
#ifdef HAVE_WEBP
{"gvplugin_webp_LTX_library", &gvplugin_webp_LTX_library},
#endif
#endif
#ifdef HAVE_LIBGD
{"gvplugin_gd_LTX_library", &gvplugin_gd_LTX_library},
#endif
{"gvplugin_core_LTX_library", &gvplugin_core_LTX_library},
{0, 0}};

StringBuffer lastErrorStr;

int vizErrorf(char *buf)
{
lastErrorStr = buf;
return 0;
}

extern int Y_invert;
int origYInvert = Y_invert;
extern int Nop;
int origNop = Nop;

StringBuffer layout_result;

extern "C"
{
const char *layout(const char *src, const char *format, const char *engine)
{
layout_result = "";

GVC_t *gvc = gvContextPlugins(lt_preloaded_symbols, true);

Agraph_t *graph = agmemread(src);
if (graph)
{
char *data = NULL;
unsigned int length;

gvLayout(gvc, graph, engine);
gvRenderData(gvc, graph, format, &data, &length);
layout_result = data;
gvFreeRenderData(data);
gvFreeLayout(gvc, graph);
agclose(graph);
}

gvFinalize(gvc);
gvFreeContext(gvc);

return layout_result;
}

const char *lastError()
{
return lastErrorStr;
}
}
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