现象：界面调整的过程中，串口偶现freetype2错误打印，界面无文字显示
环境：linux，minigui4.0，freetype2.6.1
打印：设备狂刷10s左右下列打印，
[18:42:35.895]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.906]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.907]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.918]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:35.918]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.929]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.929]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.940]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:35.940]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.951]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.951]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.962]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:35.962]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.973]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.973]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.985]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.387]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.398]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.398]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.406]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.449]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.460]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.460]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.467]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.518]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.530]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.531]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.540]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.540]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.550]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.550]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.564]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.564]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.573]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.573]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.584]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.584]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.595]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.595]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.607]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.617]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.617]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.628]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.628]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.640]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.641]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.650]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.651]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.662]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.662]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.674]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.674]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.684]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.684]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.695]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.706]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.706]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.719]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.719]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.728]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.729]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.740]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.740]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.751]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.751]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.762]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.762]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.773]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.774]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.783]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.794]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.794]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.805]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.805]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.816]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.816]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.828]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.829]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.838]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.839]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.850]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.850]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.861]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.861]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.872]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.883]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.884]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.894]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.895]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.906]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.906]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.917]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.917]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.928]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.928]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.939]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.940]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.950]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.950]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.961]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.972]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.972]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.983]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.983]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.994]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:38.995]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.007]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:39.007]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.018]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:39.018]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.029]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:39.029]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.039]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:39.039]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.050]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:39.061]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.061]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:39.072]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.072]FONT>FT2: can't access image cache for index: 0x31: 55
[18:42:39.084]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.085]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.095]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.095]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.105]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.106]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.116]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.117]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.128]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.128]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.139]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.139]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.150]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.161]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.162]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.171]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.172]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.183]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.183]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.194]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.194]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.205]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.205]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.218]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.218]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.228]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.238]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.239]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.250]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.250]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.260]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.261]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.272]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.272]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.283]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.283]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.295]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.295]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.305]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.305]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.316]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.328]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.328]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.338]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.338]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.349]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.349]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.360]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.361]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.372]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.372]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.382]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.383]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.393]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.394]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.405]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.416]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.416]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.427]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.427]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.439]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.439]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.449]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.449]FONT>FT2: can't access image cache for index: 0x28: 55
[18:42:39.460]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.460]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.472]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.472]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.483]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.483]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.494]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.494]FONT>FT2: can't access image cache for index: 0x39: 55
[18:42:39.505]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.516]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.516]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.526]FONT>FT2: can't access image cache for index: 0x2C: 55
[18:42:39.526]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:39.537]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.538]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:39.549]FONT>FT2: can't access image cache for index: 0x3D: 55
[18:42:39.550]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:35.895]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.906]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.907]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.918]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:35.918]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.929]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.929]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.940]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:35.940]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.951]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.951]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.962]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:35.962]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.973]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:35.973]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:35.985]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:37.147]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:37.148]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:37.158]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:37.159]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:37.169]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:37.181]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:37.181]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:37.187]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.387]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.398]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.398]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.406]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.449]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.460]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.460]FONT>FT2: can't access image cache for index: 0x0: 55
[18:42:38.467]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.518]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.530]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.531]FONT>FT2: can't access image cache for index: 0x2F: 55
[18:42:38.540]get_glyph_advance: load_or_search_glyph error in freetype2
[18:42:38.540]FONT>FT2: can't access image cache for index: 0x24: 55
[18:42:38.550]get_glyph_bbox: load_or_search_glyph error in freetype2
[18:42:38.550]FONT>FT2: can't access image cache for index: 0x24: 55
将你的freetype库升级到2.8或之后的版本试试，github上有人遇到你类似的问题，具体可参考：
https://github.com/ValveSoftware/Source-1-Games/issues/2110
指针丢失，首先先得确认硬件有没有问题，另外看一下指向的读取位内存是不是出现了变化。
关注问题，+1
参考一下 https://blog.csdn.net/lianchao668/article/details/8106732
MINIGUI常见错误集及解决方法
https://blog.csdn.net/lianchao668/article/details/8106732