Mercurial > molko
view molko-js/src/js-sprite.c @ 190:5dc57029b9f1
molko-js: allow objects/parameters in Molko.Painter API
author | David Demelier <markand@malikania.fr> |
---|---|
date | Sat, 07 Nov 2020 10:16:38 +0100 |
parents | a5436e15898d |
children | 633a25df450e |
line wrap: on
line source
/* * js-sprite.c -- image sprites (Javascript bindings) * * Copyright (c) 2020 David Demelier <markand@malikania.fr> * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <assert.h> #include <duktape.h> #include <core/alloc.h> #include <core/sprite.h> #include <core/texture.h> #include "js-sprite.h" #include "js-texture.h" #include "js.h" #include "js_p.h" #define SYMBOL DUK_HIDDEN_SYMBOL("molko::sprite") #define TEXTURE_REF DUK_HIDDEN_SYMBOL("molko::sprite::texture") static struct sprite * js_sprite_this(duk_context *ctx) { struct sprite *sprite; duk_push_this(ctx); duk_get_prop_string(ctx, -1, SYMBOL); sprite = duk_to_pointer(ctx, -1); duk_pop_n(ctx, 2); if (!sprite) duk_error(ctx, DUK_ERR_TYPE_ERROR, "Not a Sprite object"); return sprite; } static duk_ret_t js_sprite_new(duk_context *ctx) { struct js *js = js_self(ctx); struct texture *tex; struct sprite sprite; unsigned int cellw, cellh; if (!duk_is_constructor_call(ctx)) duk_error(ctx, DUK_ERR_TYPE_ERROR, "Sprite must be new-constructed"); tex = js_texture_require(js, 0); cellw = duk_require_int(ctx, 1); cellh = duk_require_int(ctx, 2); sprite_init(&sprite, tex, cellw, cellh); duk_push_this(ctx); duk_push_pointer(ctx, alloc_dup(&sprite, sizeof (sprite))); duk_put_prop_string(ctx, -2, SYMBOL); /* We store the texture into the sprite to avoid being collected. */ duk_dup(ctx, 0); duk_put_prop_string(ctx, -2, TEXTURE_REF); duk_pop(ctx); return 0; } static duk_ret_t js_sprite_finish(duk_context *ctx) { duk_get_prop_string(ctx, 0, SYMBOL); free(duk_to_pointer(ctx, -1)); duk_pop(ctx); duk_del_prop_string(ctx, 0, SYMBOL); duk_del_prop_string(ctx, 0, TEXTURE_REF); return 0; } static duk_ret_t js_sprite_draw(duk_context *ctx) { struct sprite *sprite = js_sprite_this(ctx); unsigned int r, c; int x, y; duk_require_object(ctx, 0); duk_get_prop_string(ctx, 0, "r"); r = duk_to_int(ctx, -1); duk_get_prop_string(ctx, 0, "c"); c = duk_to_int(ctx, -1); duk_get_prop_string(ctx, 0, "x"); x = duk_to_int(ctx, -1); duk_get_prop_string(ctx, 0, "y"); y = duk_to_int(ctx, -1); duk_pop_n(ctx, 4); sprite_draw(sprite, r, c, x, y); return 0; } static const duk_function_list_entry methods[] = { { "draw", js_sprite_draw, 1 }, { NULL, NULL, 0 } }; void js_sprite_load(struct js *js) { assert(js); duk_push_global_object(js->handle); duk_get_prop_string(js->handle, -1, "Molko"); duk_push_c_function(js->handle, js_sprite_new, 3); duk_push_object(js->handle); duk_put_function_list(js->handle, -1, methods); duk_push_c_function(js->handle, js_sprite_finish, 1); duk_set_finalizer(js->handle, -2); duk_put_prop_string(js->handle, -2, "prototype"); duk_put_prop_string(js->handle, -2, "Sprite"); duk_pop_n(js->handle, 2); }