IssueNo: https://gitee.com/openharmony/graphic_ui/issues/I6FTGQ
Feature or Bugfix: Fea1
Binary Source:No
Signed-off-by: NSimpleCodeer <dulu150@126.com>

IssueNo: https://gitee.com/openharmony/graphic_ui/issues/I69CGJ
Feature or Bugfix: feature
Binary Source:No
Signed-off-by: Nlancer <haoshuo@huawei.com>

IssueNo: https://gitee.com/openharmony/graphic_ui/issues/I68XUH
Feature or Bugfix: Feature
Binary Source:No
Signed-off-by: Nlizhiqi <lizhiqi1@huawei.com>

IssueNo: https://gitee.com/openharmony/graphic_ui/issues/I5W3CK
Feature or Bugfix: Feature
Binary Source:No
Signed-off-by: Nlizhiqi <lizhiqi1@huawei.com>

IssueNo: https://gitee.com/openharmony/graphic_ui/issues/I5VLPZ
Feature or Bugfix: Bugfix
Binary Source: No
Signed-off-by: Nsuwenxiang <suwenxiang@huawei.com>

IssueNo: https://gitee.com/openharmony/graphic_ui/issues/I5UCNU
Feature or Bugfix: Bugfix
Binary Source:No
Signed-off-by: youbing54<youbing3@huawei.com>

RM014 支持Emoji表情
RM015 文本字体大小及颜色等属性及JS API
Signed-off-by: Nxucheng57 <xucheng57@huawei.com>

Signed-off-by: Nliuyuxiang-bear <liuyuxiang7@huawei.com>
Change-Id: Ice311de57f051d7ecc934c684743bd7aced9284f

相关的Issue

原因（目的、解决的问题等）
更新图形系统中UICanva画布API功能
RM008 对标H5，支持实现如下属性及接口
RM009 线条样式属性及矩形方法
RM011 在画布上绘制文本（无填充）以及向画布上绘制图像
RM012 支持alpha和合成模式属性
RM013 渐变填充方法的实现

描述（做了什么，变更了什么）
更新图形系统中UICanva画布API功能
RM008 对标H5，支持实现如下属性及接口
RM009 线条样式属性及矩形方法
RM011 在画布上绘制文本（无填充）以及向画布上绘制图像
RM012 支持alpha和合成模式属性
RM013 渐变填充方法的实现

测试用例（新增、改动、可能影响的功能）
foundation/graphic/ui/test/unittest/components/ui_canvas_unit_test.cpp
Signed-off-by: Nxucheng57 <xucheng57@huawei.com>