C++层实现原文:
http://www.jianshu.com/p/16fa878f74c2
因为lua层 没有
Image:getData()
这个接口
所以只能自己导出
为了避免导出整个数据 可能会引起大容量内存的复制
所以我只做了一个 得到一个像素点数据的接口
接口如下:
//G:\Mycocos310Cpp\touchAlpha\cocos2d\cocos\platform\CCImage.h
Color4B Image::getOneData(int nTouch_x, int nTouch_y, Size imageSize)
{
int picx = nTouch_x;
//png在内存中是从左上角开始读取像素的 而cocos是左下角开始 需要转换(记得-1)
int picy = imageSize.height - nTouch_y - 1;
CCLOG("x = %d, y = %d", picx, picy);
Color4B color4B = { 0, 0, 0, 0 };
unsigned int *pixel = (unsigned int *)_data;
pixel = pixel + (picy * (int)imageSize.width) * 1 + picx * 1;
//R通道
color4B.r = *pixel & 0xff;
//G通道
color4B.g = (*pixel >> 8) & 0xff;
//B通过
color4B.b = (*pixel >> 16) & 0xff;
//Alpha通道，我们有用的就是Alpha
color4B.a = (*pixel >> 24) & 0xff;
return color4B;
}
//G:\Mycocos310Cpp\touchAlpha\cocos2d\cocos\platform\CCImage.cpp
/**
@by lyf 2017年11月11日(双十一)
@得到一个像素的数据
@param nTouch_x 鼠标点击到图片的坐标 X 从左下角开始计算
@param nTouch_y 鼠标点击到图片的坐标 X 从左下角开始计算
@param imageSize 图片的范围大小 getContentSize()
@return 该像素点颜色值(包括alpha通道)
*/
Color4B getOneData(int nTouch_x, int nTouch_y, Size imageSize);
导出到lua接口
//E:\Cocos\Cocos2d-x\cocos2d-x-3.10\cocos\scripting\lua-bindings\auto\lua_cocos2dx_auto.cpp
tolua_function(tolua_S, "getOneData", lua_cocos2dx_Image_getOneData);
image.png
//E:\Cocos\Cocos2d-x\cocos2d-x-3.10\cocos\scripting\lua-bindings\auto\lua_cocos2dx_auto.cpp
//新增lua导出获得一个像素点的具体像素值 包括通道
int lua_cocos2dx_Image_getOneData(lua_State* tolua_S)
{
int argc = 0;
cocos2d::Image* cobj = nullptr;
bool ok = true;
#if COCOS2D_DEBUG >= 1
tolua_Error tolua_err;
#endif
cobj = (cocos2d::Image*)tolua_tousertype(tolua_S, 1, 0);
#if COCOS2D_DEBUG >= 1
if (!cobj)
{
tolua_error(tolua_S, "invalid 'cobj' in function 'lua_cocos2dx_Image_getOneData'", nullptr);
return 0;
}
#endif
argc = lua_gettop(tolua_S) - 1;
if (argc == 3)
{
int arg0;
int arg1;
cocos2d::Size arg2;
ok &= luaval_to_int32(tolua_S, 2, (int *)&arg0, "cc.Image:getOneData");
if (!ok)
{
tolua_error(tolua_S, "invalid arguments in function 'lua_cocos2dx_Image_getOneData'", nullptr);
return 0;
}
ok &= luaval_to_int32(tolua_S, 3, (int *)&arg1, "cc.Image:getOneData");
if (!ok)
{
tolua_error(tolua_S, "invalid arguments in function 'lua_cocos2dx_Image_getOneData'", nullptr);
return 0;
}
ok &= luaval_to_size(tolua_S, 4, &arg2, "cc.Image:getOneData");
if (!ok)
{
tolua_error(tolua_S, "invalid arguments in function 'lua_cocos2dx_Image_getOneData'", nullptr);
return 0;
}
const cocos2d::Color4B& ret = cobj->getOneData(arg0, arg1, arg2);
color4b_to_luaval(tolua_S, ret);
return 1;
}
luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d \n", "ccui.Text:getTextColor", argc, 0);
return 0;
#if COCOS2D_DEBUG >= 1
tolua_lerror:
tolua_error(tolua_S, "#ferror in function 'lua_cocos2dx_Image_getOneData'.", &tolua_err);
#endif
return 0;
}
写完后编译
拷贝发生改变的exe 和 libcocos2d.dll
image.png
因为我是在框架项目中改变的 其余项目共享exe 和dll框架
所以框架改变后需要拷贝 如果只是一份项目 则无需此步
lua层调用代码 先来个简单的接口调用部分
--i:\Test310\simulator\win32\src\app\views\MainScene.lua
local MainScene = class("MainScene", cc.load("mvc").ViewBase)
--MainScene.RESOURCE_FILENAME = "MainScene.csb"
function MainScene:onCreate()
printf("resource node = %s", tostring(self:getResourceNode()))
self.sprite = cc.Sprite:create("red3.png")
self.sprite:setPosition(50, 50)
self:addChild(self.sprite, 1)
local size = self.sprite:getContentSize() -- 返回size
local pImage = cc.Image:new()
pImage:initWithImageFile("red3.png")
local size = self.sprite:getContentSize()
for j = 0, 2 do
for i = 0, 2 do
print(i, j)
local ovt = pImage:getOneData(i, j, size)
dump(ovt, "ovt = ")--仅需这里打印像素数据测试
end
end
--pImage 这里结束后就直接回收了 没有addChild
end
return MainScene
打印结果
[LUA-print] resource node = nil
libpng warning: iCCP: known incorrect sRGB profile
[LUA-print] 0 0
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
[LUA-print] 1 0
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
[LUA-print] 2 0
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
[LUA-print] 0 1
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
[LUA-print] 1 1
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 0
[LUA-print] - "b" = 0
[LUA-print] - "g" = 0
[LUA-print] - "r" = 0
[LUA-print] - }
[LUA-print] 2 1
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
[LUA-print] 0 2
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
[LUA-print] 1 2
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
[LUA-print] 2 2
[LUA-print] dump from: [string ".\app/views/MainScene.lua"]:20: in function 'onC
reate'
[LUA-print] - "ovt = " = {
[LUA-print] - "a" = 255
[LUA-print] - "b" = 0
[LUA-print] - "g" = 255
[LUA-print] - "r" = 92
[LUA-print] - }
上传图片样式
image.png
可自行下载原图
red3.png
图片就是一张9像素 3*3的绿色图片 中间1像素镂空
