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DVRRDK2.80 上动态叠加字符



各位好:

我想在DM8168 平台上动态叠加字符,

我把DVRRDK3.50 Demo_draw_text 添加到开发包里,可以显示字符,

但是当动态改变字符长度(比如00:00:00 改成00:00)的时候,字符图像就完全乱了,不再恢复正常,

请问不能动态修改内容么?