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quickjs調(diào)用lvgl函數(shù)的示例代碼

 更新時間：2023年11月29日 09:59:28   作者：無腦仔的小明  
這篇文章主要介紹了quickjs調(diào)用lvgl函數(shù),實現(xiàn)本次使用quickjs的最主要目的，就是通過程序動態(tài)加載js，然后調(diào)用lvgl函數(shù)庫，實現(xiàn)渲染，需要的朋友可以參考下

實現(xiàn)本次使用quickjs的最主要目的，就是通過程序動態(tài)加載js，然后調(diào)用lvgl函數(shù)庫，實現(xiàn)渲染。以達到類似小程序的效果。后續(xù)還會實現(xiàn)類似小程序效果，通過quickjs解析xml(html)，編譯成js然后調(diào)用lvgl庫，實現(xiàn)界面渲染。通過quickjs會調(diào)用c語言提供的底層功能，如wifi、藍牙、串口uart、iic、isp、pwd、led等等硬件io功能。

下面寫一些例子，只做技術(shù)驗證

lvgl_export.h

#include <string.h>
#include <stdlib.h>
#include "quickjs-libc.h"
#include "cutils.h"
#include "lvgl.h"
#define lv_obj_ptr_t uintptr_t
extern JSModuleDef *js_init_module_lvgl(JSContext *ctx, const char *module_name);
int JS_ToInt8(JSContext *ctx, int8_t *pres, JSValueConst val);
int JS_ToUint8(JSContext *ctx, uint8_t *pres, JSValueConst val);
int JS_ToInt16(JSContext *ctx, int16_t *pres, JSValueConst val);
int JS_ToUint16(JSContext *ctx, uint16_t *pres, JSValueConst val);
int JS_ToPointer(JSContext *ctx, lv_obj_ptr_t *pres, JSValueConst val);
static inline JSValue JS_NewPointer(JSContext *ctx, lv_obj_ptr_t val);

lvgl_export.c

#include "lvgl_export.h"
static JSValue lvgl_obj_create(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * parent = (lv_obj_t *)p;
  lv_obj_t * obj = lv_obj_create(parent);
  return JS_NewPointer(ctx, (lv_obj_ptr_t)obj);
}
static JSValue lvgl_label_create(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * parent = (lv_obj_t *)p;
  lv_obj_t * lbl = lv_label_create(parent);
  return JS_NewPointer(ctx, (lv_obj_ptr_t)lbl);
}
static JSValue lvgl_label_set_text(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * lbl = (lv_obj_t *)p;
  const char * str = JS_ToCString(ctx, argv[1]);
  lv_label_set_text(lbl, str);
  return JS_NULL;
}
static JSValue lvgl_scr_load(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * lbl = (lv_obj_t *)p;
  lv_scr_load(lbl);
  return JS_NULL;
}
static JSValue lvgl_obj_set_pos(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 3) {
    lv_coord_t x = 0;
    JS_ToInt16(ctx, &x, argv[1]);
    lv_coord_t y = 0;
    JS_ToInt16(ctx, &y, argv[2]);
    lv_obj_set_pos(obj, x, y);
  }
}
static JSValue lvgl_obj_set_size(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 3) {
    lv_coord_t w = 0;
    JS_ToInt16(ctx, &w, argv[1]);
    lv_coord_t h = 0;
    JS_ToInt16(ctx, &h, argv[2]);
    lv_obj_set_size(obj, w, h);
  }
}
static JSValue lvgl_obj_set_style_bg_color(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 2) {
    uint32_t color = 0;
    JS_ToUint32(ctx, &color, argv[1]);
    lv_color_t c = lv_color_hex(color);
      lv_obj_set_style_bg_color(obj, c, LV_PART_MAIN|LV_STATE_DEFAULT);
  }else if(argc == 3){
    uint32_t color = 0;
    JS_ToUint32(ctx, &color, argv[1]);
    lv_color_t c = lv_color_hex(color);
    uint32_t mark = 0;
    JS_ToUint32(ctx, &mark, argv[2]);
    lv_obj_set_style_bg_color(obj, c, mark);
  }
}
static JSValue lvgl_obj_set_style_bg_opa(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 2) {
    uint8_t opa = 0;
    JS_ToUint8(ctx, &opa, argv[1]);
      lv_obj_set_style_bg_opa(obj, opa, LV_PART_MAIN|LV_STATE_DEFAULT);
  }else if(argc == 3){
    uint8_t opa = 0;
    JS_ToUint8(ctx, &opa, argv[1]);
    uint32_t mark = 0;
    JS_ToUint32(ctx, &mark, argv[2]);
    lv_obj_set_style_bg_opa(obj, opa, mark);
  }
}
static const JSCFunctionListEntry js_lvgl_funcs[] = {
  JS_PROP_STRING_DEF("test", "test..", JS_PROP_C_W_E),
  JS_CFUNC_DEF("lvgl_obj_create", 1, lvgl_obj_create),
  JS_CFUNC_DEF("lvgl_label_create", 1, lvgl_label_create),
  JS_CFUNC_DEF("lvgl_label_set_text", 2, lvgl_label_set_text),
  JS_CFUNC_DEF("lvgl_obj_set_pos", 3, lvgl_obj_set_pos),
  JS_CFUNC_DEF("lvgl_obj_set_size", 3, lvgl_obj_set_size),
  JS_CFUNC_DEF("lvgl_obj_set_style_bg_color", 3, lvgl_obj_set_style_bg_color),
  JS_CFUNC_DEF("lvgl_obj_set_style_bg_opa", 3, lvgl_obj_set_style_bg_opa),
  JS_CFUNC_DEF("lvgl_scr_load", 1, lvgl_scr_load),
};
static int js_lvgl_init(JSContext *ctx, JSModuleDef *m)
{
  return JS_SetModuleExportList(ctx, m, js_lvgl_funcs,
                                countof(js_lvgl_funcs));
}
JSModuleDef *js_init_module_lvgl(JSContext *ctx, const char *module_name)
{
  JSModuleDef *m;
  m = JS_NewCModule(ctx, module_name, js_lvgl_init);
  if (!m)
    return NULL;
  JS_AddModuleExportList(ctx, m, js_lvgl_funcs, countof(js_lvgl_funcs));
  return m;
}
int JS_ToInt8(JSContext *ctx, int8_t *pres, JSValueConst val)
{
  uint32_t v;
  int ret = JS_ToInt32(ctx, &v, val);
  *pres = v > 0x7f? 0x7f : v < -0x80? -0x80 : v;
  return ret;
}
int JS_ToUint8(JSContext *ctx, uint8_t *pres, JSValueConst val)
{
  uint32_t v;
  int ret = JS_ToUint32(ctx, &v, val);
  *pres = v > 0xff? 0xff : v;
  return ret;
}
int JS_ToInt16(JSContext *ctx, int16_t *pres, JSValueConst val)
{
  int32_t v;
  int ret = JS_ToInt32(ctx, &v, val);
  *pres = v > 0x7fff? 0x7fff : v < -0x8000? -0x8000 : v;
  return ret;
}
int JS_ToUint16(JSContext *ctx, uint16_t *pres, JSValueConst val)
{
  uint32_t v;
  int ret = JS_ToUint32(ctx, &v, val);
  *pres = v > 0xffff? 0xffff : v;
  return v;
}
int JS_ToPointer(JSContext *ctx, lv_obj_ptr_t *pres, JSValueConst val)
{
  if (sizeof(lv_obj_ptr_t) == 8)
  {
    return JS_ToInt64(ctx, (uint64_t *)pres, val);
  }
  else
  {
    return JS_ToInt32(ctx, (uint32_t *)pres, val);
  }
}
static inline JSValue JS_NewPointer(JSContext *ctx, lv_obj_ptr_t val)
{
  if (sizeof(lv_obj_ptr_t) == 8)
  {
    return JS_NewInt64(ctx, val);
  }
  else
  {
    return JS_NewInt32(ctx, val);
  }
}
#include "lvgl_export.h"
static JSValue lvgl_obj_create(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * parent = (lv_obj_t *)p;
  lv_obj_t * obj = lv_obj_create(parent);
  return JS_NewPointer(ctx, (lv_obj_ptr_t)obj);
}
static JSValue lvgl_label_create(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * parent = (lv_obj_t *)p;
  lv_obj_t * lbl = lv_label_create(parent);
  return JS_NewPointer(ctx, (lv_obj_ptr_t)lbl);
}
static JSValue lvgl_label_set_text(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * lbl = (lv_obj_t *)p;
  const char * str = JS_ToCString(ctx, argv[1]);
  lv_label_set_text(lbl, str);
  return JS_NULL;
}
static JSValue lvgl_scr_load(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * lbl = (lv_obj_t *)p;
  lv_scr_load(lbl);
  return JS_NULL;
}
static JSValue lvgl_obj_set_pos(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 3) {
    lv_coord_t x = 0;
    JS_ToInt16(ctx, &x, argv[1]);
    lv_coord_t y = 0;
    JS_ToInt16(ctx, &y, argv[2]);
    lv_obj_set_pos(obj, x, y);
  }
}
static JSValue lvgl_obj_set_size(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 3) {
    lv_coord_t w = 0;
    JS_ToInt16(ctx, &w, argv[1]);
    lv_coord_t h = 0;
    JS_ToInt16(ctx, &h, argv[2]);
    lv_obj_set_size(obj, w, h);
  }
}
static JSValue lvgl_obj_set_style_bg_color(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 2) {
    uint32_t color = 0;
    JS_ToUint32(ctx, &color, argv[1]);
    lv_color_t c = lv_color_hex(color);
      lv_obj_set_style_bg_color(obj, c, LV_PART_MAIN|LV_STATE_DEFAULT);
  }else if(argc == 3){
    uint32_t color = 0;
    JS_ToUint32(ctx, &color, argv[1]);
    lv_color_t c = lv_color_hex(color);
    uint32_t mark = 0;
    JS_ToUint32(ctx, &mark, argv[2]);
    lv_obj_set_style_bg_color(obj, c, mark);
  }
}
static JSValue lvgl_obj_set_style_bg_opa(JSContext *ctx, JSValueConst this_val,
                                    int argc, JSValueConst *argv)
{
  lv_obj_ptr_t p;
  JS_ToPointer(ctx, &p, argv[0]);
  lv_obj_t * obj = (lv_obj_t *)p;
  if (argc == 2) {
    uint8_t opa = 0;
    JS_ToUint8(ctx, &opa, argv[1]);
      lv_obj_set_style_bg_opa(obj, opa, LV_PART_MAIN|LV_STATE_DEFAULT);
  }else if(argc == 3){
    uint8_t opa = 0;
    JS_ToUint8(ctx, &opa, argv[1]);
    uint32_t mark = 0;
    JS_ToUint32(ctx, &mark, argv[2]);
    lv_obj_set_style_bg_opa(obj, opa, mark);
  }
}
static const JSCFunctionListEntry js_lvgl_funcs[] = {
  JS_PROP_STRING_DEF("test", "test..", JS_PROP_C_W_E),
  JS_CFUNC_DEF("lvgl_obj_create", 1, lvgl_obj_create),
  JS_CFUNC_DEF("lvgl_label_create", 1, lvgl_label_create),
  JS_CFUNC_DEF("lvgl_label_set_text", 2, lvgl_label_set_text),
  JS_CFUNC_DEF("lvgl_obj_set_pos", 3, lvgl_obj_set_pos),
  JS_CFUNC_DEF("lvgl_obj_set_size", 3, lvgl_obj_set_size),
  JS_CFUNC_DEF("lvgl_obj_set_style_bg_color", 3, lvgl_obj_set_style_bg_color),
  JS_CFUNC_DEF("lvgl_obj_set_style_bg_opa", 3, lvgl_obj_set_style_bg_opa),
  JS_CFUNC_DEF("lvgl_scr_load", 1, lvgl_scr_load),
};
static int js_lvgl_init(JSContext *ctx, JSModuleDef *m)
{
  return JS_SetModuleExportList(ctx, m, js_lvgl_funcs,
                                countof(js_lvgl_funcs));
}
JSModuleDef *js_init_module_lvgl(JSContext *ctx, const char *module_name)
{
  JSModuleDef *m;
  m = JS_NewCModule(ctx, module_name, js_lvgl_init);
  if (!m)
    return NULL;
  JS_AddModuleExportList(ctx, m, js_lvgl_funcs, countof(js_lvgl_funcs));
  return m;
}
int JS_ToInt8(JSContext *ctx, int8_t *pres, JSValueConst val)
{
  uint32_t v;
  int ret = JS_ToInt32(ctx, &v, val);
  *pres = v > 0x7f? 0x7f : v < -0x80? -0x80 : v;
  return ret;
}
int JS_ToUint8(JSContext *ctx, uint8_t *pres, JSValueConst val)
{
  uint32_t v;
  int ret = JS_ToUint32(ctx, &v, val);
  *pres = v > 0xff? 0xff : v;
  return ret;
}
int JS_ToInt16(JSContext *ctx, int16_t *pres, JSValueConst val)
{
  int32_t v;
  int ret = JS_ToInt32(ctx, &v, val);
  *pres = v > 0x7fff? 0x7fff : v < -0x8000? -0x8000 : v;
  return ret;
}
int JS_ToUint16(JSContext *ctx, uint16_t *pres, JSValueConst val)
{
  uint32_t v;
  int ret = JS_ToUint32(ctx, &v, val);
  *pres = v > 0xffff? 0xffff : v;
  return v;
}
int JS_ToPointer(JSContext *ctx, lv_obj_ptr_t *pres, JSValueConst val)
{
  if (sizeof(lv_obj_ptr_t) == 8)
  {
    return JS_ToInt64(ctx, (uint64_t *)pres, val);
  }
  else
  {
    return JS_ToInt32(ctx, (uint32_t *)pres, val);
  }
}
static inline JSValue JS_NewPointer(JSContext *ctx, lv_obj_ptr_t val)
{
  if (sizeof(lv_obj_ptr_t) == 8)
  {
    return JS_NewInt64(ctx, val);
  }
  else
  {
    return JS_NewInt32(ctx, val);
  }
}

custom.c 關(guān)鍵代碼

JSRuntime *rt = NULL;
JSContext *ctx = NULL;
void lvgl_js_init() {
  printf("lvgl_js_init\n");
  rt = JS_NewRuntime();
  js_std_init_handlers(rt);
  ctx = JS_NewContext(rt);
  js_init_module_std(ctx, "std");
  js_init_module_os(ctx, "os");
  js_init_module_lvgl(ctx, "lvgl");
  const char *str =
      "import * as std from 'std';\n"
      "import * as lvgl from 'lvgl';\n"
      "import * as os from 'os';\n"
      "globalThis.std = std;\n"
      "globalThis.lvgl = lvgl;\n"
      "var console = {};\n"
      "console.log = function(value){std.printf(value + '\\n');}\n"
      "globalThis.console = console\n"
      "";
  JSValue init_compile =
      JS_Eval(ctx, str, strlen(str), "<input>", JS_EVAL_TYPE_MODULE | JS_EVAL_FLAG_COMPILE_ONLY);
  js_module_set_import_meta(ctx, init_compile, 1, 1);
  JSValue init_run = JS_EvalFunction(ctx, init_compile);
}
void run_js(){
  //讀取文件，并運行js
  FILE *fp = fopen("test.js", "r");
  if(fp == NULL){
    printf("open file error\n");
    return;
  }
  fseek(fp, 0, SEEK_END);
  int len = ftell(fp);
  fseek(fp, 0, SEEK_SET);
  len = len + 1;
  char *buf = (char *)malloc(len);
  memset(buf, 0, len);
  fread(buf, 1, len, fp);
  printf("============CODE==========\n");
  printf("FILE: %d \n\n%s\n", len, buf);
  printf("==========================\n");
  fclose(fp);
  JSValue result = JS_Eval(ctx, buf, strlen(buf), "test", JS_EVAL_TYPE_MODULE);
  js_std_loop(ctx);
  int clen;
  int to_int_32;
  if ((to_int_32 = JS_ToInt32(ctx, &clen, result)) != 0) {
    js_std_dump_error(ctx);
  }
}
/**
 * Create a demo application
 */
void custom_init(lv_ui *ui)
{
  /* Add your codes here */
  lvgl_js_init();
  run_js();
}

test.js

import * as lvgl from 'lvgl';
//如果要在cmd控制臺輸出中文， 在控制臺執(zhí)行chcp 65001切換至utf-8
console.log("JS Dev utf-8");
var screen = lvgl.lvgl_obj_create(); //這個作為頁面
var lbl = lvgl.lvgl_label_create(screen);
lvgl.lvgl_label_set_text(lbl, "HELLO");
lvgl.lvgl_obj_set_pos(lbl, 150, 10);
lvgl.lvgl_obj_set_size(lbl, 100, 100);
lvgl.lvgl_obj_set_style_bg_opa(lbl, 255);
lvgl.lvgl_obj_set_style_bg_color(lbl, 0x2195f6);
var lbl = lvgl.lvgl_label_create(screen);
lvgl.lvgl_label_set_text(lbl, "WORLD");
lvgl.lvgl_obj_set_pos(lbl, 200, 150);
lvgl.lvgl_obj_set_size(lbl, 100, 50);
lvgl.lvgl_obj_set_style_bg_opa(lbl, 200);
lvgl.lvgl_obj_set_style_bg_color(lbl, 0x2195f6);
lvgl.lvgl_scr_load(screen);
console.log("End.");

預(yù)覽效果

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