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| 1 /* |
| 2 * Copyright 2013 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "SkLua.h" |
| 9 #include "SkCanvas.h" |
| 10 #include "SkPaint.h" |
| 11 #include "SkPath.h" |
| 12 #include "SkMatrix.h" |
| 13 #include "SkRRect.h" |
| 14 #include "SkString.h" |
| 15 |
| 16 extern "C" { |
| 17 #include "lua.h" |
| 18 #include "lauxlib.h" |
| 19 } |
| 20 |
| 21 static const char gSkCanvas_MTName[] = "SkCanvas_LuaMetaTableName"; |
| 22 static const char gSkMatrix_MTName[] = "SkMatrix_LuaMetaTableName"; |
| 23 static const char gSkRRect_MTName[] = "SkSkRRect_LuaMetaTableName"; |
| 24 static const char gSkPath_MTName[] = "SkPath_LuaMetaTableName"; |
| 25 static const char gSkPaint_MTName[] = "SkPaint_LuaMetaTableName"; |
| 26 |
| 27 static const char* get_mtname(const SkCanvas&) { return gSkCanvas_MTName; } |
| 28 static const char* get_mtname(const SkMatrix&) { return gSkMatrix_MTName; } |
| 29 static const char* get_mtname(const SkRRect&) { return gSkRRect_MTName; } |
| 30 static const char* get_mtname(const SkPath&) { return gSkPath_MTName; } |
| 31 static const char* get_mtname(const SkPaint&) { return gSkPaint_MTName; } |
| 32 |
| 33 template <typename T> void push_obj(lua_State* L, const T& obj) { |
| 34 new (lua_newuserdata(L, sizeof(T))) T(obj); |
| 35 luaL_getmetatable(L, get_mtname(obj)); |
| 36 lua_setmetatable(L, -2); |
| 37 } |
| 38 |
| 39 template <typename T> void push_ref(lua_State* L, T* ref) { |
| 40 *(T**)lua_newuserdata(L, sizeof(T*)) = SkRef(ref); |
| 41 luaL_getmetatable(L, get_mtname(*ref)); |
| 42 lua_setmetatable(L, -2); |
| 43 } |
| 44 |
| 45 template <typename T> T* get_ref(lua_State* L, int index) { |
| 46 const T* ref = NULL; |
| 47 return *(T**)luaL_checkudata(L, index, get_mtname(*ref)); |
| 48 } |
| 49 |
| 50 template <typename T> T* get_obj(lua_State* L, int index) { |
| 51 const T* obj = NULL; |
| 52 return (T*)luaL_checkudata(L, index, get_mtname(*obj)); |
| 53 } |
| 54 |
| 55 /////////////////////////////////////////////////////////////////////////////// |
| 56 |
| 57 static void setfield_string(lua_State* L, const char key[], const char value[])
{ |
| 58 lua_pushstring(L, value); |
| 59 lua_setfield(L, -2, key); |
| 60 } |
| 61 |
| 62 static void setfield_number(lua_State* L, const char key[], double value) { |
| 63 lua_pushnumber(L, value); |
| 64 lua_setfield(L, -2, key); |
| 65 } |
| 66 |
| 67 SkLua::SkLua(lua_State* L) : fL(L) { |
| 68 static bool gOnce; |
| 69 if (!gOnce) { |
| 70 SkLua::Load(L); |
| 71 gOnce = true; |
| 72 } |
| 73 } |
| 74 |
| 75 SkLua::~SkLua() { |
| 76 } |
| 77 |
| 78 #define CHECK_SETFIELD(key) do if (key) lua_setfield(fL, -2, key); while (0) |
| 79 |
| 80 void SkLua::pushBool(bool value, const char key[]) { |
| 81 lua_pushboolean(fL, value); |
| 82 CHECK_SETFIELD(key); |
| 83 } |
| 84 |
| 85 void SkLua::pushString(const char str[], const char key[]) { |
| 86 lua_pushstring(fL, str); |
| 87 CHECK_SETFIELD(key); |
| 88 } |
| 89 |
| 90 void SkLua::pushString(const SkString& str, const char key[]) { |
| 91 lua_pushstring(fL, str.c_str()); |
| 92 CHECK_SETFIELD(key); |
| 93 } |
| 94 |
| 95 void SkLua::pushColor(SkColor color, const char key[]) { |
| 96 lua_newtable(fL); |
| 97 setfield_number(fL, "a", SkColorGetA(color) / 255.0); |
| 98 setfield_number(fL, "r", SkColorGetR(color) / 255.0); |
| 99 setfield_number(fL, "g", SkColorGetG(color) / 255.0); |
| 100 setfield_number(fL, "b", SkColorGetB(color) / 255.0); |
| 101 CHECK_SETFIELD(key); |
| 102 } |
| 103 |
| 104 void SkLua::pushScalar(SkScalar value, const char key[]) { |
| 105 lua_pushnumber(fL, SkScalarToLua(value)); |
| 106 CHECK_SETFIELD(key); |
| 107 } |
| 108 |
| 109 void SkLua::pushRect(const SkRect& r, const char key[]) { |
| 110 lua_newtable(fL); |
| 111 setfield_number(fL, "left", SkScalarToLua(r.fLeft)); |
| 112 setfield_number(fL, "top", SkScalarToLua(r.fTop)); |
| 113 setfield_number(fL, "right", SkScalarToLua(r.fRight)); |
| 114 setfield_number(fL, "bottom", SkScalarToLua(r.fBottom)); |
| 115 CHECK_SETFIELD(key); |
| 116 } |
| 117 |
| 118 void SkLua::pushRRect(const SkRRect& rr, const char key[]) { |
| 119 push_obj(fL, rr); |
| 120 CHECK_SETFIELD(key); |
| 121 } |
| 122 |
| 123 void SkLua::pushMatrix(const SkMatrix& matrix, const char key[]) { |
| 124 push_obj(fL, matrix); |
| 125 CHECK_SETFIELD(key); |
| 126 } |
| 127 |
| 128 void SkLua::pushPaint(const SkPaint& paint, const char key[]) { |
| 129 push_obj(fL, paint); |
| 130 CHECK_SETFIELD(key); |
| 131 } |
| 132 |
| 133 void SkLua::pushPath(const SkPath& path, const char key[]) { |
| 134 push_obj(fL, path); |
| 135 CHECK_SETFIELD(key); |
| 136 } |
| 137 |
| 138 void SkLua::pushCanvas(SkCanvas* canvas, const char key[]) { |
| 139 push_ref(fL, canvas); |
| 140 CHECK_SETFIELD(key); |
| 141 } |
| 142 |
| 143 /////////////////////////////////////////////////////////////////////////////// |
| 144 /////////////////////////////////////////////////////////////////////////////// |
| 145 |
| 146 static SkScalar lua2scalar(lua_State* L, int index) { |
| 147 SkASSERT(lua_isnumber(L, index)); |
| 148 return SkLuaToScalar(lua_tonumber(L, index)); |
| 149 } |
| 150 |
| 151 static SkScalar getfield_scalar(lua_State* L, int index, const char key[]) { |
| 152 SkASSERT(lua_istable(L, index)); |
| 153 lua_pushstring(L, key); |
| 154 lua_gettable(L, index); |
| 155 |
| 156 SkScalar value = lua2scalar(L, -1); |
| 157 lua_pop(L, 1); |
| 158 return value; |
| 159 } |
| 160 |
| 161 static U8CPU unit2byte(SkScalar x) { |
| 162 if (x <= 0) { |
| 163 return 0; |
| 164 } else if (x >= 1) { |
| 165 return 255; |
| 166 } else { |
| 167 return SkScalarRoundToInt(x * 255); |
| 168 } |
| 169 } |
| 170 |
| 171 static SkColor lua2color(lua_State* L, int index) { |
| 172 return SkColorSetARGB(unit2byte(getfield_scalar(L, index, "a")), |
| 173 unit2byte(getfield_scalar(L, index, "r")), |
| 174 unit2byte(getfield_scalar(L, index, "g")), |
| 175 unit2byte(getfield_scalar(L, index, "b"))); |
| 176 } |
| 177 |
| 178 static SkRect* lua2rect(lua_State* L, int index, SkRect* rect) { |
| 179 rect->set(getfield_scalar(L, index, "left"), |
| 180 getfield_scalar(L, index, "top"), |
| 181 getfield_scalar(L, index, "right"), |
| 182 getfield_scalar(L, index, "bottom")); |
| 183 return rect; |
| 184 } |
| 185 |
| 186 static int lcanvas_drawColor(lua_State* L) { |
| 187 get_ref<SkCanvas>(L, 1)->drawColor(lua2color(L, 2)); |
| 188 return 0; |
| 189 } |
| 190 |
| 191 static int lcanvas_drawRect(lua_State* L) { |
| 192 SkRect rect; |
| 193 get_ref<SkCanvas>(L, 1)->drawRect(*lua2rect(L, 2, &rect), |
| 194 *get_obj<SkPaint>(L, 3)); |
| 195 return 0; |
| 196 } |
| 197 |
| 198 static int lcanvas_drawOval(lua_State* L) { |
| 199 SkRect rect; |
| 200 get_ref<SkCanvas>(L, 1)->drawOval(*lua2rect(L, 2, &rect), |
| 201 *get_obj<SkPaint>(L, 3)); |
| 202 return 0; |
| 203 } |
| 204 |
| 205 static int lcanvas_drawCircle(lua_State* L) { |
| 206 get_ref<SkCanvas>(L, 1)->drawCircle(lua2scalar(L, 2), |
| 207 lua2scalar(L, 3), |
| 208 lua2scalar(L, 4), |
| 209 *get_obj<SkPaint>(L, 5)); |
| 210 return 0; |
| 211 } |
| 212 |
| 213 static int lcanvas_getSaveCount(lua_State* L) { |
| 214 lua_pushnumber(L, get_ref<SkCanvas>(L, 1)->getSaveCount()); |
| 215 return 1; |
| 216 } |
| 217 |
| 218 static int lcanvas_getTotalMatrix(lua_State* L) { |
| 219 SkLua(L).pushMatrix(get_ref<SkCanvas>(L, 1)->getTotalMatrix()); |
| 220 return 1; |
| 221 } |
| 222 |
| 223 static int lcanvas_gc(lua_State* L) { |
| 224 get_ref<SkCanvas>(L, 1)->unref(); |
| 225 return 0; |
| 226 } |
| 227 |
| 228 static const struct luaL_Reg gSkCanvas_Methods[] = { |
| 229 { "drawColor", lcanvas_drawColor }, |
| 230 { "drawRect", lcanvas_drawRect }, |
| 231 { "drawOval", lcanvas_drawOval }, |
| 232 { "drawCircle", lcanvas_drawCircle }, |
| 233 { "getSaveCount", lcanvas_getSaveCount }, |
| 234 { "getTotalMatrix", lcanvas_getTotalMatrix }, |
| 235 { "__gc", lcanvas_gc }, |
| 236 { NULL, NULL } |
| 237 }; |
| 238 |
| 239 /////////////////////////////////////////////////////////////////////////////// |
| 240 |
| 241 static int lpaint_isAntiAlias(lua_State* L) { |
| 242 lua_pushboolean(L, get_obj<SkPaint>(L, 1)->isAntiAlias()); |
| 243 return 1; |
| 244 } |
| 245 |
| 246 static int lpaint_setAntiAlias(lua_State* L) { |
| 247 get_obj<SkPaint>(L, 1)->setAntiAlias(lua_toboolean(L, 2)); |
| 248 return 0; |
| 249 } |
| 250 |
| 251 static int lpaint_getColor(lua_State* L) { |
| 252 SkLua(L).pushColor(get_obj<SkPaint>(L, 1)->getColor()); |
| 253 return 1; |
| 254 } |
| 255 |
| 256 static int lpaint_setColor(lua_State* L) { |
| 257 get_obj<SkPaint>(L, 1)->setColor(lua2color(L, 2)); |
| 258 return 0; |
| 259 } |
| 260 |
| 261 static int lpaint_gc(lua_State* L) { |
| 262 get_obj<SkPaint>(L, 1)->~SkPaint(); |
| 263 return 0; |
| 264 } |
| 265 |
| 266 static const struct luaL_Reg gSkPaint_Methods[] = { |
| 267 { "isAntiAlias", lpaint_isAntiAlias }, |
| 268 { "setAntiAlias", lpaint_setAntiAlias }, |
| 269 { "getColor", lpaint_getColor }, |
| 270 { "setColor", lpaint_setColor }, |
| 271 { "__gc", lpaint_gc }, |
| 272 { NULL, NULL } |
| 273 }; |
| 274 |
| 275 /////////////////////////////////////////////////////////////////////////////// |
| 276 |
| 277 static int lpath_getBounds(lua_State* L) { |
| 278 SkLua(L).pushRect(get_obj<SkPath>(L, 1)->getBounds()); |
| 279 return 1; |
| 280 } |
| 281 |
| 282 static int lpath_isEmpty(lua_State* L) { |
| 283 lua_pushboolean(L, get_obj<SkPath>(L, 1)->isEmpty()); |
| 284 return 1; |
| 285 } |
| 286 |
| 287 static int lpath_isRect(lua_State* L) { |
| 288 SkRect r; |
| 289 bool pred = get_obj<SkPath>(L, 1)->isRect(&r); |
| 290 int ret_count = 1; |
| 291 lua_pushboolean(L, pred); |
| 292 if (pred) { |
| 293 SkLua(L).pushRect(r); |
| 294 ret_count += 1; |
| 295 } |
| 296 return ret_count; |
| 297 } |
| 298 |
| 299 static const char* dir2string(SkPath::Direction dir) { |
| 300 static const char* gStr[] = { |
| 301 "unknown", "cw", "ccw" |
| 302 }; |
| 303 SkASSERT((unsigned)dir < SK_ARRAY_COUNT(gStr)); |
| 304 return gStr[dir]; |
| 305 } |
| 306 |
| 307 static int lpath_isNestedRects(lua_State* L) { |
| 308 SkRect rects[2]; |
| 309 SkPath::Direction dirs[2]; |
| 310 bool pred = get_obj<SkPath>(L, 1)->isNestedRects(rects, dirs); |
| 311 int ret_count = 1; |
| 312 lua_pushboolean(L, pred); |
| 313 if (pred) { |
| 314 SkLua lua(L); |
| 315 lua.pushRect(rects[0]); |
| 316 lua.pushRect(rects[1]); |
| 317 lua_pushstring(L, dir2string(dirs[0])); |
| 318 lua_pushstring(L, dir2string(dirs[0])); |
| 319 ret_count += 4; |
| 320 } |
| 321 return ret_count; |
| 322 } |
| 323 |
| 324 static int lpath_reset(lua_State* L) { |
| 325 get_obj<SkPath>(L, 1)->reset(); |
| 326 return 0; |
| 327 } |
| 328 |
| 329 static int lpath_moveTo(lua_State* L) { |
| 330 get_obj<SkPath>(L, 1)->moveTo(lua2scalar(L, 2), lua2scalar(L, 3)); |
| 331 return 0; |
| 332 } |
| 333 |
| 334 static int lpath_lineTo(lua_State* L) { |
| 335 get_obj<SkPath>(L, 1)->lineTo(lua2scalar(L, 2), lua2scalar(L, 3)); |
| 336 return 0; |
| 337 } |
| 338 |
| 339 static int lpath_quadTo(lua_State* L) { |
| 340 get_obj<SkPath>(L, 1)->quadTo(lua2scalar(L, 2), lua2scalar(L, 3), |
| 341 lua2scalar(L, 4), lua2scalar(L, 5)); |
| 342 return 0; |
| 343 } |
| 344 |
| 345 static int lpath_cubicTo(lua_State* L) { |
| 346 get_obj<SkPath>(L, 1)->cubicTo(lua2scalar(L, 2), lua2scalar(L, 3), |
| 347 lua2scalar(L, 4), lua2scalar(L, 5), |
| 348 lua2scalar(L, 6), lua2scalar(L, 7)); |
| 349 return 0; |
| 350 } |
| 351 |
| 352 static int lpath_close(lua_State* L) { |
| 353 get_obj<SkPath>(L, 1)->close(); |
| 354 return 0; |
| 355 } |
| 356 |
| 357 static int lpath_gc(lua_State* L) { |
| 358 get_obj<SkPath>(L, 1)->~SkPath(); |
| 359 return 0; |
| 360 } |
| 361 |
| 362 static const struct luaL_Reg gSkPath_Methods[] = { |
| 363 { "getBounds", lpath_getBounds }, |
| 364 { "isEmpty", lpath_isEmpty }, |
| 365 { "isRect", lpath_isRect }, |
| 366 { "isNestedRects", lpath_isNestedRects }, |
| 367 { "reset", lpath_reset }, |
| 368 { "moveTo", lpath_moveTo }, |
| 369 { "lineTo", lpath_lineTo }, |
| 370 { "quadTo", lpath_quadTo }, |
| 371 { "cubicTo", lpath_cubicTo }, |
| 372 { "close", lpath_close }, |
| 373 { "__gc", lpath_gc }, |
| 374 { NULL, NULL } |
| 375 }; |
| 376 |
| 377 /////////////////////////////////////////////////////////////////////////////// |
| 378 |
| 379 static const char* rrect_type(const SkRRect& rr) { |
| 380 switch (rr.getType()) { |
| 381 case SkRRect::kUnknown_Type: return "unknown"; |
| 382 case SkRRect::kEmpty_Type: return "empty"; |
| 383 case SkRRect::kRect_Type: return "rect"; |
| 384 case SkRRect::kOval_Type: return "oval"; |
| 385 case SkRRect::kSimple_Type: return "simple"; |
| 386 case SkRRect::kComplex_Type: return "complex"; |
| 387 } |
| 388 SkASSERT(!"never get here"); |
| 389 return ""; |
| 390 } |
| 391 |
| 392 static int lrrect_rect(lua_State* L) { |
| 393 SkLua(L).pushRect(get_obj<SkRRect>(L, 1)->rect()); |
| 394 return 1; |
| 395 } |
| 396 |
| 397 static int lrrect_type(lua_State* L) { |
| 398 lua_pushstring(L, rrect_type(*get_obj<SkRRect>(L, 1))); |
| 399 return 1; |
| 400 } |
| 401 |
| 402 static int lrrect_radii(lua_State* L) { |
| 403 int corner = lua_tointeger(L, 2); |
| 404 SkVector v; |
| 405 if (corner < 0 || corner > 3) { |
| 406 SkDebugf("bad corner index %d", corner); |
| 407 v.set(0, 0); |
| 408 } else { |
| 409 v = get_obj<SkRRect>(L, 1)->radii((SkRRect::Corner)corner); |
| 410 } |
| 411 lua_pushnumber(L, v.fX); |
| 412 lua_pushnumber(L, v.fY); |
| 413 return 2; |
| 414 } |
| 415 |
| 416 static int lrrect_gc(lua_State* L) { |
| 417 get_obj<SkRRect>(L, 1)->~SkRRect(); |
| 418 return 0; |
| 419 } |
| 420 |
| 421 static const struct luaL_Reg gSkRRect_Methods[] = { |
| 422 { "rect", lrrect_rect }, |
| 423 { "type", lrrect_type }, |
| 424 { "radii", lrrect_radii }, |
| 425 { "__gc", lrrect_gc }, |
| 426 { NULL, NULL } |
| 427 }; |
| 428 |
| 429 /////////////////////////////////////////////////////////////////////////////// |
| 430 |
| 431 class AutoCallLua { |
| 432 public: |
| 433 AutoCallLua(lua_State* L, const char func[], const char verb[]) : fL(L) { |
| 434 lua_getglobal(L, func); |
| 435 if (!lua_isfunction(L, -1)) { |
| 436 int t = lua_type(L, -1); |
| 437 SkDebugf("--- expected function %d\n", t); |
| 438 } |
| 439 |
| 440 lua_newtable(L); |
| 441 setfield_string(L, "verb", verb); |
| 442 } |
| 443 |
| 444 ~AutoCallLua() { |
| 445 if (lua_pcall(fL, 1, 0, 0) != LUA_OK) { |
| 446 SkDebugf("lua err: %s\n", lua_tostring(fL, -1)); |
| 447 } |
| 448 lua_settop(fL, -1); |
| 449 } |
| 450 |
| 451 private: |
| 452 lua_State* fL; |
| 453 }; |
| 454 |
| 455 #define AUTO_LUA(verb) AutoCallLua acl(fL, fFunc.c_str(), verb) |
| 456 |
| 457 /////////////////////////////////////////////////////////////////////////////// |
| 458 |
| 459 #define REG_CLASS(L, C) \ |
| 460 do { \ |
| 461 luaL_newmetatable(L, g##C##_MTName); \ |
| 462 lua_pushvalue(L, -1); \ |
| 463 lua_setfield(L, -2, "__index"); \ |
| 464 luaL_setfuncs(L, g##C##_Methods, 0); \ |
| 465 lua_pop(L, 1); /* pop off the meta-table */ \ |
| 466 } while (0) |
| 467 |
| 468 void SkLua::Load(lua_State* L) { |
| 469 REG_CLASS(L, SkCanvas); |
| 470 REG_CLASS(L, SkPath); |
| 471 REG_CLASS(L, SkPaint); |
| 472 REG_CLASS(L, SkRRect); |
| 473 } |
| 474 |
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