reed@google.com | 74ce6f0 | 2013-05-22 15:13:18 +0000 | [diff] [blame] | 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 | |
reed@google.com | 88c9ec9 | 2013-05-22 15:43:21 +0000 | [diff] [blame^] | 55 | static bool lua2bool(lua_State* L, int index) { |
| 56 | return !!lua_toboolean(L, index); |
| 57 | } |
| 58 | |
reed@google.com | 74ce6f0 | 2013-05-22 15:13:18 +0000 | [diff] [blame] | 59 | /////////////////////////////////////////////////////////////////////////////// |
| 60 | |
| 61 | static void setfield_string(lua_State* L, const char key[], const char value[]) { |
| 62 | lua_pushstring(L, value); |
| 63 | lua_setfield(L, -2, key); |
| 64 | } |
| 65 | |
| 66 | static void setfield_number(lua_State* L, const char key[], double value) { |
| 67 | lua_pushnumber(L, value); |
| 68 | lua_setfield(L, -2, key); |
| 69 | } |
| 70 | |
| 71 | SkLua::SkLua(lua_State* L) : fL(L) { |
| 72 | static bool gOnce; |
| 73 | if (!gOnce) { |
| 74 | SkLua::Load(L); |
| 75 | gOnce = true; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | SkLua::~SkLua() { |
| 80 | } |
| 81 | |
| 82 | #define CHECK_SETFIELD(key) do if (key) lua_setfield(fL, -2, key); while (0) |
| 83 | |
| 84 | void SkLua::pushBool(bool value, const char key[]) { |
| 85 | lua_pushboolean(fL, value); |
| 86 | CHECK_SETFIELD(key); |
| 87 | } |
| 88 | |
| 89 | void SkLua::pushString(const char str[], const char key[]) { |
| 90 | lua_pushstring(fL, str); |
| 91 | CHECK_SETFIELD(key); |
| 92 | } |
| 93 | |
| 94 | void SkLua::pushString(const SkString& str, const char key[]) { |
| 95 | lua_pushstring(fL, str.c_str()); |
| 96 | CHECK_SETFIELD(key); |
| 97 | } |
| 98 | |
| 99 | void SkLua::pushColor(SkColor color, const char key[]) { |
| 100 | lua_newtable(fL); |
| 101 | setfield_number(fL, "a", SkColorGetA(color) / 255.0); |
| 102 | setfield_number(fL, "r", SkColorGetR(color) / 255.0); |
| 103 | setfield_number(fL, "g", SkColorGetG(color) / 255.0); |
| 104 | setfield_number(fL, "b", SkColorGetB(color) / 255.0); |
| 105 | CHECK_SETFIELD(key); |
| 106 | } |
| 107 | |
| 108 | void SkLua::pushScalar(SkScalar value, const char key[]) { |
| 109 | lua_pushnumber(fL, SkScalarToLua(value)); |
| 110 | CHECK_SETFIELD(key); |
| 111 | } |
| 112 | |
| 113 | void SkLua::pushRect(const SkRect& r, const char key[]) { |
| 114 | lua_newtable(fL); |
| 115 | setfield_number(fL, "left", SkScalarToLua(r.fLeft)); |
| 116 | setfield_number(fL, "top", SkScalarToLua(r.fTop)); |
| 117 | setfield_number(fL, "right", SkScalarToLua(r.fRight)); |
| 118 | setfield_number(fL, "bottom", SkScalarToLua(r.fBottom)); |
| 119 | CHECK_SETFIELD(key); |
| 120 | } |
| 121 | |
| 122 | void SkLua::pushRRect(const SkRRect& rr, const char key[]) { |
| 123 | push_obj(fL, rr); |
| 124 | CHECK_SETFIELD(key); |
| 125 | } |
| 126 | |
| 127 | void SkLua::pushMatrix(const SkMatrix& matrix, const char key[]) { |
| 128 | push_obj(fL, matrix); |
| 129 | CHECK_SETFIELD(key); |
| 130 | } |
| 131 | |
| 132 | void SkLua::pushPaint(const SkPaint& paint, const char key[]) { |
| 133 | push_obj(fL, paint); |
| 134 | CHECK_SETFIELD(key); |
| 135 | } |
| 136 | |
| 137 | void SkLua::pushPath(const SkPath& path, const char key[]) { |
| 138 | push_obj(fL, path); |
| 139 | CHECK_SETFIELD(key); |
| 140 | } |
| 141 | |
| 142 | void SkLua::pushCanvas(SkCanvas* canvas, const char key[]) { |
| 143 | push_ref(fL, canvas); |
| 144 | CHECK_SETFIELD(key); |
| 145 | } |
| 146 | |
| 147 | /////////////////////////////////////////////////////////////////////////////// |
| 148 | /////////////////////////////////////////////////////////////////////////////// |
| 149 | |
| 150 | static SkScalar lua2scalar(lua_State* L, int index) { |
| 151 | SkASSERT(lua_isnumber(L, index)); |
| 152 | return SkLuaToScalar(lua_tonumber(L, index)); |
| 153 | } |
| 154 | |
| 155 | static SkScalar getfield_scalar(lua_State* L, int index, const char key[]) { |
| 156 | SkASSERT(lua_istable(L, index)); |
| 157 | lua_pushstring(L, key); |
| 158 | lua_gettable(L, index); |
| 159 | |
| 160 | SkScalar value = lua2scalar(L, -1); |
| 161 | lua_pop(L, 1); |
| 162 | return value; |
| 163 | } |
| 164 | |
| 165 | static U8CPU unit2byte(SkScalar x) { |
| 166 | if (x <= 0) { |
| 167 | return 0; |
| 168 | } else if (x >= 1) { |
| 169 | return 255; |
| 170 | } else { |
| 171 | return SkScalarRoundToInt(x * 255); |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | static SkColor lua2color(lua_State* L, int index) { |
| 176 | return SkColorSetARGB(unit2byte(getfield_scalar(L, index, "a")), |
| 177 | unit2byte(getfield_scalar(L, index, "r")), |
| 178 | unit2byte(getfield_scalar(L, index, "g")), |
| 179 | unit2byte(getfield_scalar(L, index, "b"))); |
| 180 | } |
| 181 | |
| 182 | static SkRect* lua2rect(lua_State* L, int index, SkRect* rect) { |
| 183 | rect->set(getfield_scalar(L, index, "left"), |
| 184 | getfield_scalar(L, index, "top"), |
| 185 | getfield_scalar(L, index, "right"), |
| 186 | getfield_scalar(L, index, "bottom")); |
| 187 | return rect; |
| 188 | } |
| 189 | |
| 190 | static int lcanvas_drawColor(lua_State* L) { |
| 191 | get_ref<SkCanvas>(L, 1)->drawColor(lua2color(L, 2)); |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | static int lcanvas_drawRect(lua_State* L) { |
| 196 | SkRect rect; |
| 197 | get_ref<SkCanvas>(L, 1)->drawRect(*lua2rect(L, 2, &rect), |
| 198 | *get_obj<SkPaint>(L, 3)); |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static int lcanvas_drawOval(lua_State* L) { |
| 203 | SkRect rect; |
| 204 | get_ref<SkCanvas>(L, 1)->drawOval(*lua2rect(L, 2, &rect), |
| 205 | *get_obj<SkPaint>(L, 3)); |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | static int lcanvas_drawCircle(lua_State* L) { |
| 210 | get_ref<SkCanvas>(L, 1)->drawCircle(lua2scalar(L, 2), |
| 211 | lua2scalar(L, 3), |
| 212 | lua2scalar(L, 4), |
| 213 | *get_obj<SkPaint>(L, 5)); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static int lcanvas_getSaveCount(lua_State* L) { |
| 218 | lua_pushnumber(L, get_ref<SkCanvas>(L, 1)->getSaveCount()); |
| 219 | return 1; |
| 220 | } |
| 221 | |
| 222 | static int lcanvas_getTotalMatrix(lua_State* L) { |
| 223 | SkLua(L).pushMatrix(get_ref<SkCanvas>(L, 1)->getTotalMatrix()); |
| 224 | return 1; |
| 225 | } |
| 226 | |
| 227 | static int lcanvas_gc(lua_State* L) { |
| 228 | get_ref<SkCanvas>(L, 1)->unref(); |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static const struct luaL_Reg gSkCanvas_Methods[] = { |
| 233 | { "drawColor", lcanvas_drawColor }, |
| 234 | { "drawRect", lcanvas_drawRect }, |
| 235 | { "drawOval", lcanvas_drawOval }, |
| 236 | { "drawCircle", lcanvas_drawCircle }, |
| 237 | { "getSaveCount", lcanvas_getSaveCount }, |
| 238 | { "getTotalMatrix", lcanvas_getTotalMatrix }, |
| 239 | { "__gc", lcanvas_gc }, |
| 240 | { NULL, NULL } |
| 241 | }; |
| 242 | |
| 243 | /////////////////////////////////////////////////////////////////////////////// |
| 244 | |
| 245 | static int lpaint_isAntiAlias(lua_State* L) { |
| 246 | lua_pushboolean(L, get_obj<SkPaint>(L, 1)->isAntiAlias()); |
| 247 | return 1; |
| 248 | } |
| 249 | |
| 250 | static int lpaint_setAntiAlias(lua_State* L) { |
reed@google.com | 88c9ec9 | 2013-05-22 15:43:21 +0000 | [diff] [blame^] | 251 | get_obj<SkPaint>(L, 1)->setAntiAlias(lua2bool(L, 2)); |
reed@google.com | 74ce6f0 | 2013-05-22 15:13:18 +0000 | [diff] [blame] | 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | static int lpaint_getColor(lua_State* L) { |
| 256 | SkLua(L).pushColor(get_obj<SkPaint>(L, 1)->getColor()); |
| 257 | return 1; |
| 258 | } |
| 259 | |
| 260 | static int lpaint_setColor(lua_State* L) { |
| 261 | get_obj<SkPaint>(L, 1)->setColor(lua2color(L, 2)); |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static int lpaint_gc(lua_State* L) { |
| 266 | get_obj<SkPaint>(L, 1)->~SkPaint(); |
| 267 | return 0; |
| 268 | } |
| 269 | |
| 270 | static const struct luaL_Reg gSkPaint_Methods[] = { |
| 271 | { "isAntiAlias", lpaint_isAntiAlias }, |
| 272 | { "setAntiAlias", lpaint_setAntiAlias }, |
| 273 | { "getColor", lpaint_getColor }, |
| 274 | { "setColor", lpaint_setColor }, |
| 275 | { "__gc", lpaint_gc }, |
| 276 | { NULL, NULL } |
| 277 | }; |
| 278 | |
| 279 | /////////////////////////////////////////////////////////////////////////////// |
| 280 | |
| 281 | static int lpath_getBounds(lua_State* L) { |
| 282 | SkLua(L).pushRect(get_obj<SkPath>(L, 1)->getBounds()); |
| 283 | return 1; |
| 284 | } |
| 285 | |
| 286 | static int lpath_isEmpty(lua_State* L) { |
| 287 | lua_pushboolean(L, get_obj<SkPath>(L, 1)->isEmpty()); |
| 288 | return 1; |
| 289 | } |
| 290 | |
| 291 | static int lpath_isRect(lua_State* L) { |
| 292 | SkRect r; |
| 293 | bool pred = get_obj<SkPath>(L, 1)->isRect(&r); |
| 294 | int ret_count = 1; |
| 295 | lua_pushboolean(L, pred); |
| 296 | if (pred) { |
| 297 | SkLua(L).pushRect(r); |
| 298 | ret_count += 1; |
| 299 | } |
| 300 | return ret_count; |
| 301 | } |
| 302 | |
| 303 | static const char* dir2string(SkPath::Direction dir) { |
| 304 | static const char* gStr[] = { |
| 305 | "unknown", "cw", "ccw" |
| 306 | }; |
| 307 | SkASSERT((unsigned)dir < SK_ARRAY_COUNT(gStr)); |
| 308 | return gStr[dir]; |
| 309 | } |
| 310 | |
| 311 | static int lpath_isNestedRects(lua_State* L) { |
| 312 | SkRect rects[2]; |
| 313 | SkPath::Direction dirs[2]; |
| 314 | bool pred = get_obj<SkPath>(L, 1)->isNestedRects(rects, dirs); |
| 315 | int ret_count = 1; |
| 316 | lua_pushboolean(L, pred); |
| 317 | if (pred) { |
| 318 | SkLua lua(L); |
| 319 | lua.pushRect(rects[0]); |
| 320 | lua.pushRect(rects[1]); |
| 321 | lua_pushstring(L, dir2string(dirs[0])); |
| 322 | lua_pushstring(L, dir2string(dirs[0])); |
| 323 | ret_count += 4; |
| 324 | } |
| 325 | return ret_count; |
| 326 | } |
| 327 | |
| 328 | static int lpath_reset(lua_State* L) { |
| 329 | get_obj<SkPath>(L, 1)->reset(); |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | static int lpath_moveTo(lua_State* L) { |
| 334 | get_obj<SkPath>(L, 1)->moveTo(lua2scalar(L, 2), lua2scalar(L, 3)); |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | static int lpath_lineTo(lua_State* L) { |
| 339 | get_obj<SkPath>(L, 1)->lineTo(lua2scalar(L, 2), lua2scalar(L, 3)); |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static int lpath_quadTo(lua_State* L) { |
| 344 | get_obj<SkPath>(L, 1)->quadTo(lua2scalar(L, 2), lua2scalar(L, 3), |
| 345 | lua2scalar(L, 4), lua2scalar(L, 5)); |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static int lpath_cubicTo(lua_State* L) { |
| 350 | get_obj<SkPath>(L, 1)->cubicTo(lua2scalar(L, 2), lua2scalar(L, 3), |
| 351 | lua2scalar(L, 4), lua2scalar(L, 5), |
| 352 | lua2scalar(L, 6), lua2scalar(L, 7)); |
| 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | static int lpath_close(lua_State* L) { |
| 357 | get_obj<SkPath>(L, 1)->close(); |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static int lpath_gc(lua_State* L) { |
| 362 | get_obj<SkPath>(L, 1)->~SkPath(); |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static const struct luaL_Reg gSkPath_Methods[] = { |
| 367 | { "getBounds", lpath_getBounds }, |
| 368 | { "isEmpty", lpath_isEmpty }, |
| 369 | { "isRect", lpath_isRect }, |
| 370 | { "isNestedRects", lpath_isNestedRects }, |
| 371 | { "reset", lpath_reset }, |
| 372 | { "moveTo", lpath_moveTo }, |
| 373 | { "lineTo", lpath_lineTo }, |
| 374 | { "quadTo", lpath_quadTo }, |
| 375 | { "cubicTo", lpath_cubicTo }, |
| 376 | { "close", lpath_close }, |
| 377 | { "__gc", lpath_gc }, |
| 378 | { NULL, NULL } |
| 379 | }; |
| 380 | |
| 381 | /////////////////////////////////////////////////////////////////////////////// |
| 382 | |
| 383 | static const char* rrect_type(const SkRRect& rr) { |
| 384 | switch (rr.getType()) { |
| 385 | case SkRRect::kUnknown_Type: return "unknown"; |
| 386 | case SkRRect::kEmpty_Type: return "empty"; |
| 387 | case SkRRect::kRect_Type: return "rect"; |
| 388 | case SkRRect::kOval_Type: return "oval"; |
| 389 | case SkRRect::kSimple_Type: return "simple"; |
| 390 | case SkRRect::kComplex_Type: return "complex"; |
| 391 | } |
| 392 | SkASSERT(!"never get here"); |
| 393 | return ""; |
| 394 | } |
| 395 | |
| 396 | static int lrrect_rect(lua_State* L) { |
| 397 | SkLua(L).pushRect(get_obj<SkRRect>(L, 1)->rect()); |
| 398 | return 1; |
| 399 | } |
| 400 | |
| 401 | static int lrrect_type(lua_State* L) { |
| 402 | lua_pushstring(L, rrect_type(*get_obj<SkRRect>(L, 1))); |
| 403 | return 1; |
| 404 | } |
| 405 | |
| 406 | static int lrrect_radii(lua_State* L) { |
| 407 | int corner = lua_tointeger(L, 2); |
| 408 | SkVector v; |
| 409 | if (corner < 0 || corner > 3) { |
| 410 | SkDebugf("bad corner index %d", corner); |
| 411 | v.set(0, 0); |
| 412 | } else { |
| 413 | v = get_obj<SkRRect>(L, 1)->radii((SkRRect::Corner)corner); |
| 414 | } |
| 415 | lua_pushnumber(L, v.fX); |
| 416 | lua_pushnumber(L, v.fY); |
| 417 | return 2; |
| 418 | } |
| 419 | |
| 420 | static int lrrect_gc(lua_State* L) { |
| 421 | get_obj<SkRRect>(L, 1)->~SkRRect(); |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static const struct luaL_Reg gSkRRect_Methods[] = { |
| 426 | { "rect", lrrect_rect }, |
| 427 | { "type", lrrect_type }, |
| 428 | { "radii", lrrect_radii }, |
| 429 | { "__gc", lrrect_gc }, |
| 430 | { NULL, NULL } |
| 431 | }; |
| 432 | |
| 433 | /////////////////////////////////////////////////////////////////////////////// |
| 434 | |
| 435 | class AutoCallLua { |
| 436 | public: |
| 437 | AutoCallLua(lua_State* L, const char func[], const char verb[]) : fL(L) { |
| 438 | lua_getglobal(L, func); |
| 439 | if (!lua_isfunction(L, -1)) { |
| 440 | int t = lua_type(L, -1); |
| 441 | SkDebugf("--- expected function %d\n", t); |
| 442 | } |
| 443 | |
| 444 | lua_newtable(L); |
| 445 | setfield_string(L, "verb", verb); |
| 446 | } |
| 447 | |
| 448 | ~AutoCallLua() { |
| 449 | if (lua_pcall(fL, 1, 0, 0) != LUA_OK) { |
| 450 | SkDebugf("lua err: %s\n", lua_tostring(fL, -1)); |
| 451 | } |
| 452 | lua_settop(fL, -1); |
| 453 | } |
| 454 | |
| 455 | private: |
| 456 | lua_State* fL; |
| 457 | }; |
| 458 | |
| 459 | #define AUTO_LUA(verb) AutoCallLua acl(fL, fFunc.c_str(), verb) |
| 460 | |
| 461 | /////////////////////////////////////////////////////////////////////////////// |
| 462 | |
| 463 | #define REG_CLASS(L, C) \ |
| 464 | do { \ |
| 465 | luaL_newmetatable(L, g##C##_MTName); \ |
| 466 | lua_pushvalue(L, -1); \ |
| 467 | lua_setfield(L, -2, "__index"); \ |
| 468 | luaL_setfuncs(L, g##C##_Methods, 0); \ |
| 469 | lua_pop(L, 1); /* pop off the meta-table */ \ |
| 470 | } while (0) |
| 471 | |
| 472 | void SkLua::Load(lua_State* L) { |
| 473 | REG_CLASS(L, SkCanvas); |
| 474 | REG_CLASS(L, SkPath); |
| 475 | REG_CLASS(L, SkPaint); |
| 476 | REG_CLASS(L, SkRRect); |
| 477 | } |
| 478 | |