| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkLua.h" |
| #include "SkCanvas.h" |
| #include "SkPaint.h" |
| #include "SkPath.h" |
| #include "SkMatrix.h" |
| #include "SkRRect.h" |
| #include "SkString.h" |
| #include "SkTypeface.h" |
| |
| extern "C" { |
| #include "lua.h" |
| #include "lualib.h" |
| #include "lauxlib.h" |
| } |
| |
| // return the metatable name for a given class |
| template <typename T> const char* get_mtname(); |
| #define DEF_MTNAME(T) \ |
| template <> const char* get_mtname<T>() { \ |
| return #T "_LuaMetaTableName"; \ |
| } |
| |
| DEF_MTNAME(SkCanvas) |
| DEF_MTNAME(SkMatrix) |
| DEF_MTNAME(SkRRect) |
| DEF_MTNAME(SkPath) |
| DEF_MTNAME(SkPaint) |
| |
| template <typename T> T* push_new(lua_State* L) { |
| T* addr = (T*)lua_newuserdata(L, sizeof(T)); |
| new (addr) T; |
| luaL_getmetatable(L, get_mtname<T>()); |
| lua_setmetatable(L, -2); |
| return addr; |
| } |
| |
| template <typename T> void push_obj(lua_State* L, const T& obj) { |
| new (lua_newuserdata(L, sizeof(T))) T(obj); |
| luaL_getmetatable(L, get_mtname<T>()); |
| lua_setmetatable(L, -2); |
| } |
| |
| template <typename T> void push_ref(lua_State* L, T* ref) { |
| *(T**)lua_newuserdata(L, sizeof(T*)) = SkRef(ref); |
| luaL_getmetatable(L, get_mtname<T>()); |
| lua_setmetatable(L, -2); |
| } |
| |
| template <typename T> T* get_ref(lua_State* L, int index) { |
| return *(T**)luaL_checkudata(L, index, get_mtname<T>()); |
| } |
| |
| template <typename T> T* get_obj(lua_State* L, int index) { |
| return (T*)luaL_checkudata(L, index, get_mtname<T>()); |
| } |
| |
| static bool lua2bool(lua_State* L, int index) { |
| return !!lua_toboolean(L, index); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkLua::SkLua(const char termCode[]) : fTermCode(termCode), fWeOwnL(true) { |
| fL = luaL_newstate(); |
| luaL_openlibs(fL); |
| SkLua::Load(fL); |
| } |
| |
| SkLua::SkLua(lua_State* L) : fL(L), fWeOwnL(false) {} |
| |
| SkLua::~SkLua() { |
| if (fWeOwnL) { |
| if (fTermCode.size() > 0) { |
| lua_getglobal(fL, fTermCode.c_str()); |
| if (lua_pcall(fL, 0, 0, 0) != LUA_OK) { |
| SkDebugf("lua err: %s\n", lua_tostring(fL, -1)); |
| } |
| } |
| lua_close(fL); |
| } |
| } |
| |
| bool SkLua::runCode(const char code[]) { |
| int err = luaL_loadstring(fL, code) || lua_pcall(fL, 0, 0, 0); |
| if (err) { |
| SkDebugf("--- lua failed\n"); |
| return false; |
| } |
| return true; |
| } |
| |
| bool SkLua::runCode(const void* code, size_t size) { |
| SkString str((const char*)code, size); |
| return this->runCode(str.c_str()); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #define CHECK_SETFIELD(key) do if (key) lua_setfield(fL, -2, key); while (0) |
| |
| static void setfield_string(lua_State* L, const char key[], const char value[]) { |
| lua_pushstring(L, value); |
| lua_setfield(L, -2, key); |
| } |
| |
| static void setfield_number(lua_State* L, const char key[], double value) { |
| lua_pushnumber(L, value); |
| lua_setfield(L, -2, key); |
| } |
| |
| static void setfield_function(lua_State* L, |
| const char key[], lua_CFunction value) { |
| lua_pushcfunction(L, value); |
| lua_setfield(L, -2, key); |
| } |
| |
| static void setarray_number(lua_State* L, int index, double value) { |
| lua_pushnumber(L, value); |
| lua_rawseti(L, -2, index); |
| } |
| |
| void SkLua::pushBool(bool value, const char key[]) { |
| lua_pushboolean(fL, value); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushString(const char str[], const char key[]) { |
| lua_pushstring(fL, str); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushString(const char str[], size_t length, const char key[]) { |
| // TODO: how to do this w/o making a copy? |
| SkString s(str, length); |
| lua_pushstring(fL, s.c_str()); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushString(const SkString& str, const char key[]) { |
| lua_pushstring(fL, str.c_str()); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushColor(SkColor color, const char key[]) { |
| lua_newtable(fL); |
| setfield_number(fL, "a", SkColorGetA(color) / 255.0); |
| setfield_number(fL, "r", SkColorGetR(color) / 255.0); |
| setfield_number(fL, "g", SkColorGetG(color) / 255.0); |
| setfield_number(fL, "b", SkColorGetB(color) / 255.0); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushU32(uint32_t value, const char key[]) { |
| lua_pushnumber(fL, (double)value); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushScalar(SkScalar value, const char key[]) { |
| lua_pushnumber(fL, SkScalarToLua(value)); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushArrayU16(const uint16_t array[], int count, const char key[]) { |
| lua_newtable(fL); |
| for (int i = 0; i < count; ++i) { |
| // make it base-1 to match lua convention |
| setarray_number(fL, i + 1, (double)array[i]); |
| } |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushRect(const SkRect& r, const char key[]) { |
| lua_newtable(fL); |
| setfield_number(fL, "left", SkScalarToLua(r.fLeft)); |
| setfield_number(fL, "top", SkScalarToLua(r.fTop)); |
| setfield_number(fL, "right", SkScalarToLua(r.fRight)); |
| setfield_number(fL, "bottom", SkScalarToLua(r.fBottom)); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushRRect(const SkRRect& rr, const char key[]) { |
| push_obj(fL, rr); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushMatrix(const SkMatrix& matrix, const char key[]) { |
| push_obj(fL, matrix); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushPaint(const SkPaint& paint, const char key[]) { |
| push_obj(fL, paint); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushPath(const SkPath& path, const char key[]) { |
| push_obj(fL, path); |
| CHECK_SETFIELD(key); |
| } |
| |
| void SkLua::pushCanvas(SkCanvas* canvas, const char key[]) { |
| push_ref(fL, canvas); |
| CHECK_SETFIELD(key); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static SkScalar lua2scalar(lua_State* L, int index) { |
| SkASSERT(lua_isnumber(L, index)); |
| return SkLuaToScalar(lua_tonumber(L, index)); |
| } |
| |
| static SkScalar getfield_scalar(lua_State* L, int index, const char key[]) { |
| SkASSERT(lua_istable(L, index)); |
| lua_pushstring(L, key); |
| lua_gettable(L, index); |
| |
| SkScalar value = lua2scalar(L, -1); |
| lua_pop(L, 1); |
| return value; |
| } |
| |
| static U8CPU unit2byte(SkScalar x) { |
| if (x <= 0) { |
| return 0; |
| } else if (x >= 1) { |
| return 255; |
| } else { |
| return SkScalarRoundToInt(x * 255); |
| } |
| } |
| |
| static SkColor lua2color(lua_State* L, int index) { |
| return SkColorSetARGB(unit2byte(getfield_scalar(L, index, "a")), |
| unit2byte(getfield_scalar(L, index, "r")), |
| unit2byte(getfield_scalar(L, index, "g")), |
| unit2byte(getfield_scalar(L, index, "b"))); |
| } |
| |
| static SkRect* lua2rect(lua_State* L, int index, SkRect* rect) { |
| rect->set(getfield_scalar(L, index, "left"), |
| getfield_scalar(L, index, "top"), |
| getfield_scalar(L, index, "right"), |
| getfield_scalar(L, index, "bottom")); |
| return rect; |
| } |
| |
| static int lcanvas_drawColor(lua_State* L) { |
| get_ref<SkCanvas>(L, 1)->drawColor(lua2color(L, 2)); |
| return 0; |
| } |
| |
| static int lcanvas_drawRect(lua_State* L) { |
| SkRect rect; |
| get_ref<SkCanvas>(L, 1)->drawRect(*lua2rect(L, 2, &rect), |
| *get_obj<SkPaint>(L, 3)); |
| return 0; |
| } |
| |
| static int lcanvas_drawOval(lua_State* L) { |
| SkRect rect; |
| get_ref<SkCanvas>(L, 1)->drawOval(*lua2rect(L, 2, &rect), |
| *get_obj<SkPaint>(L, 3)); |
| return 0; |
| } |
| |
| static int lcanvas_drawCircle(lua_State* L) { |
| get_ref<SkCanvas>(L, 1)->drawCircle(lua2scalar(L, 2), |
| lua2scalar(L, 3), |
| lua2scalar(L, 4), |
| *get_obj<SkPaint>(L, 5)); |
| return 0; |
| } |
| |
| static int lcanvas_drawPath(lua_State* L) { |
| get_ref<SkCanvas>(L, 1)->drawPath(*get_obj<SkPath>(L, 2), |
| *get_obj<SkPaint>(L, 3)); |
| return 0; |
| } |
| |
| static int lcanvas_getSaveCount(lua_State* L) { |
| lua_pushnumber(L, get_ref<SkCanvas>(L, 1)->getSaveCount()); |
| return 1; |
| } |
| |
| static int lcanvas_getTotalMatrix(lua_State* L) { |
| SkLua(L).pushMatrix(get_ref<SkCanvas>(L, 1)->getTotalMatrix()); |
| return 1; |
| } |
| |
| static int lcanvas_translate(lua_State* L) { |
| get_ref<SkCanvas>(L, 1)->translate(lua2scalar(L, 2), lua2scalar(L, 3)); |
| return 0; |
| } |
| |
| static int lcanvas_gc(lua_State* L) { |
| get_ref<SkCanvas>(L, 1)->unref(); |
| return 0; |
| } |
| |
| static const struct luaL_Reg gSkCanvas_Methods[] = { |
| { "drawColor", lcanvas_drawColor }, |
| { "drawRect", lcanvas_drawRect }, |
| { "drawOval", lcanvas_drawOval }, |
| { "drawCircle", lcanvas_drawCircle }, |
| { "drawPath", lcanvas_drawPath }, |
| { "getSaveCount", lcanvas_getSaveCount }, |
| { "getTotalMatrix", lcanvas_getTotalMatrix }, |
| { "translate", lcanvas_translate }, |
| { "__gc", lcanvas_gc }, |
| { NULL, NULL } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static int lpaint_isAntiAlias(lua_State* L) { |
| lua_pushboolean(L, get_obj<SkPaint>(L, 1)->isAntiAlias()); |
| return 1; |
| } |
| |
| static int lpaint_setAntiAlias(lua_State* L) { |
| get_obj<SkPaint>(L, 1)->setAntiAlias(lua2bool(L, 2)); |
| return 0; |
| } |
| |
| static int lpaint_getColor(lua_State* L) { |
| SkLua(L).pushColor(get_obj<SkPaint>(L, 1)->getColor()); |
| return 1; |
| } |
| |
| static int lpaint_setColor(lua_State* L) { |
| get_obj<SkPaint>(L, 1)->setColor(lua2color(L, 2)); |
| return 0; |
| } |
| |
| static int lpaint_getTextSize(lua_State* L) { |
| SkLua(L).pushScalar(get_obj<SkPaint>(L, 1)->getTextSize()); |
| return 1; |
| } |
| |
| static int lpaint_setTextSize(lua_State* L) { |
| get_obj<SkPaint>(L, 1)->setTextSize(lua2scalar(L, 2)); |
| return 0; |
| } |
| |
| static int lpaint_getFontID(lua_State* L) { |
| SkTypeface* face = get_obj<SkPaint>(L, 1)->getTypeface(); |
| SkLua(L).pushU32(SkTypeface::UniqueID(face)); |
| return 1; |
| } |
| |
| static int lpaint_gc(lua_State* L) { |
| get_obj<SkPaint>(L, 1)->~SkPaint(); |
| return 0; |
| } |
| |
| static const struct luaL_Reg gSkPaint_Methods[] = { |
| { "isAntiAlias", lpaint_isAntiAlias }, |
| { "setAntiAlias", lpaint_setAntiAlias }, |
| { "getColor", lpaint_getColor }, |
| { "setColor", lpaint_setColor }, |
| { "getTextSize", lpaint_getTextSize }, |
| { "setTextSize", lpaint_setTextSize }, |
| { "getFontID", lpaint_getFontID }, |
| { "__gc", lpaint_gc }, |
| { NULL, NULL } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static int lpath_getBounds(lua_State* L) { |
| SkLua(L).pushRect(get_obj<SkPath>(L, 1)->getBounds()); |
| return 1; |
| } |
| |
| static int lpath_isEmpty(lua_State* L) { |
| lua_pushboolean(L, get_obj<SkPath>(L, 1)->isEmpty()); |
| return 1; |
| } |
| |
| static int lpath_isRect(lua_State* L) { |
| SkRect r; |
| bool pred = get_obj<SkPath>(L, 1)->isRect(&r); |
| int ret_count = 1; |
| lua_pushboolean(L, pred); |
| if (pred) { |
| SkLua(L).pushRect(r); |
| ret_count += 1; |
| } |
| return ret_count; |
| } |
| |
| static const char* dir2string(SkPath::Direction dir) { |
| static const char* gStr[] = { |
| "unknown", "cw", "ccw" |
| }; |
| SkASSERT((unsigned)dir < SK_ARRAY_COUNT(gStr)); |
| return gStr[dir]; |
| } |
| |
| static int lpath_isNestedRects(lua_State* L) { |
| SkRect rects[2]; |
| SkPath::Direction dirs[2]; |
| bool pred = get_obj<SkPath>(L, 1)->isNestedRects(rects, dirs); |
| int ret_count = 1; |
| lua_pushboolean(L, pred); |
| if (pred) { |
| SkLua lua(L); |
| lua.pushRect(rects[0]); |
| lua.pushRect(rects[1]); |
| lua_pushstring(L, dir2string(dirs[0])); |
| lua_pushstring(L, dir2string(dirs[0])); |
| ret_count += 4; |
| } |
| return ret_count; |
| } |
| |
| static int lpath_reset(lua_State* L) { |
| get_obj<SkPath>(L, 1)->reset(); |
| return 0; |
| } |
| |
| static int lpath_moveTo(lua_State* L) { |
| get_obj<SkPath>(L, 1)->moveTo(lua2scalar(L, 2), lua2scalar(L, 3)); |
| return 0; |
| } |
| |
| static int lpath_lineTo(lua_State* L) { |
| get_obj<SkPath>(L, 1)->lineTo(lua2scalar(L, 2), lua2scalar(L, 3)); |
| return 0; |
| } |
| |
| static int lpath_quadTo(lua_State* L) { |
| get_obj<SkPath>(L, 1)->quadTo(lua2scalar(L, 2), lua2scalar(L, 3), |
| lua2scalar(L, 4), lua2scalar(L, 5)); |
| return 0; |
| } |
| |
| static int lpath_cubicTo(lua_State* L) { |
| get_obj<SkPath>(L, 1)->cubicTo(lua2scalar(L, 2), lua2scalar(L, 3), |
| lua2scalar(L, 4), lua2scalar(L, 5), |
| lua2scalar(L, 6), lua2scalar(L, 7)); |
| return 0; |
| } |
| |
| static int lpath_close(lua_State* L) { |
| get_obj<SkPath>(L, 1)->close(); |
| return 0; |
| } |
| |
| static int lpath_gc(lua_State* L) { |
| get_obj<SkPath>(L, 1)->~SkPath(); |
| return 0; |
| } |
| |
| static const struct luaL_Reg gSkPath_Methods[] = { |
| { "getBounds", lpath_getBounds }, |
| { "isEmpty", lpath_isEmpty }, |
| { "isRect", lpath_isRect }, |
| { "isNestedRects", lpath_isNestedRects }, |
| { "reset", lpath_reset }, |
| { "moveTo", lpath_moveTo }, |
| { "lineTo", lpath_lineTo }, |
| { "quadTo", lpath_quadTo }, |
| { "cubicTo", lpath_cubicTo }, |
| { "close", lpath_close }, |
| { "__gc", lpath_gc }, |
| { NULL, NULL } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static const char* rrect_type(const SkRRect& rr) { |
| switch (rr.getType()) { |
| case SkRRect::kUnknown_Type: return "unknown"; |
| case SkRRect::kEmpty_Type: return "empty"; |
| case SkRRect::kRect_Type: return "rect"; |
| case SkRRect::kOval_Type: return "oval"; |
| case SkRRect::kSimple_Type: return "simple"; |
| case SkRRect::kComplex_Type: return "complex"; |
| } |
| SkASSERT(!"never get here"); |
| return ""; |
| } |
| |
| static int lrrect_rect(lua_State* L) { |
| SkLua(L).pushRect(get_obj<SkRRect>(L, 1)->rect()); |
| return 1; |
| } |
| |
| static int lrrect_type(lua_State* L) { |
| lua_pushstring(L, rrect_type(*get_obj<SkRRect>(L, 1))); |
| return 1; |
| } |
| |
| static int lrrect_radii(lua_State* L) { |
| int corner = lua_tointeger(L, 2); |
| SkVector v; |
| if (corner < 0 || corner > 3) { |
| SkDebugf("bad corner index %d", corner); |
| v.set(0, 0); |
| } else { |
| v = get_obj<SkRRect>(L, 1)->radii((SkRRect::Corner)corner); |
| } |
| lua_pushnumber(L, v.fX); |
| lua_pushnumber(L, v.fY); |
| return 2; |
| } |
| |
| static int lrrect_gc(lua_State* L) { |
| get_obj<SkRRect>(L, 1)->~SkRRect(); |
| return 0; |
| } |
| |
| static const struct luaL_Reg gSkRRect_Methods[] = { |
| { "rect", lrrect_rect }, |
| { "type", lrrect_type }, |
| { "radii", lrrect_radii }, |
| { "__gc", lrrect_gc }, |
| { NULL, NULL } |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class AutoCallLua { |
| public: |
| AutoCallLua(lua_State* L, const char func[], const char verb[]) : fL(L) { |
| lua_getglobal(L, func); |
| if (!lua_isfunction(L, -1)) { |
| int t = lua_type(L, -1); |
| SkDebugf("--- expected function %d\n", t); |
| } |
| |
| lua_newtable(L); |
| setfield_string(L, "verb", verb); |
| } |
| |
| ~AutoCallLua() { |
| if (lua_pcall(fL, 1, 0, 0) != LUA_OK) { |
| SkDebugf("lua err: %s\n", lua_tostring(fL, -1)); |
| } |
| lua_settop(fL, -1); |
| } |
| |
| private: |
| lua_State* fL; |
| }; |
| |
| #define AUTO_LUA(verb) AutoCallLua acl(fL, fFunc.c_str(), verb) |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static int lsk_newPaint(lua_State* L) { |
| push_new<SkPaint>(L); |
| return 1; |
| } |
| |
| static int lsk_newPath(lua_State* L) { |
| push_new<SkPath>(L); |
| return 1; |
| } |
| |
| static int lsk_newRRect(lua_State* L) { |
| SkRRect* rr = push_new<SkRRect>(L); |
| rr->setEmpty(); |
| return 1; |
| } |
| |
| static const struct luaL_Reg gSk_Functions[] = { |
| { "newPaint", lsk_newPaint }, |
| { "newPath", lsk_newPath }, |
| { "newRRect", lsk_newRRect }, |
| { NULL, NULL } |
| }; |
| |
| static void register_Sk(lua_State* L) { |
| lua_newtable(L); |
| lua_pushvalue(L, -1); |
| lua_setglobal(L, "Sk"); |
| // the Sk table is still on top |
| |
| setfield_function(L, "newPaint", lsk_newPaint); |
| setfield_function(L, "newPath", lsk_newPath); |
| setfield_function(L, "newRRect", lsk_newRRect); |
| lua_pop(L, 1); // pop off the Sk table |
| } |
| |
| #define REG_CLASS(L, C) \ |
| do { \ |
| luaL_newmetatable(L, get_mtname<C>()); \ |
| lua_pushvalue(L, -1); \ |
| lua_setfield(L, -2, "__index"); \ |
| luaL_setfuncs(L, g##C##_Methods, 0); \ |
| lua_pop(L, 1); /* pop off the meta-table */ \ |
| } while (0) |
| |
| void SkLua::Load(lua_State* L) { |
| register_Sk(L); |
| REG_CLASS(L, SkCanvas); |
| REG_CLASS(L, SkPath); |
| REG_CLASS(L, SkPaint); |
| REG_CLASS(L, SkRRect); |
| } |