[core] Dynamic styles

[AndrewShkrob]

A little step towards dynamic styles support

Style:
Style is a folder that contains all required resources.
Folder can be considered as a style folder when it contains style.json in its root
style.json:

{
  "name": "default",
  "light": {
    "drulesPath": "light/drules.bin",
    "symbolsPath": "light/symbols"
  },
  "dark": {
    "drulesPath": "dark/drules.bin",
    "symbolsPath": "dark/symbols"
  },
  "colorsPath": "colors.txt",
  "transitColorsPath": "transit_colors.txt",
  "patternsPath": "patterns.txt"
}

All paths in style.json are relative. A path to the file outside the style folder can be declared as ../../whatever.txt. Example:

{
  "name": "outdoors",
  "light": {
    "drulesPath": "light/drules.bin",
    "symbolsPath": "../default/light/symbols"
  },
  "dark": {
    "drulesPath": "dark/drules.bin",
    "symbolsPath": "../default/dark/symbols"
  },
  "colorsPath": "../default/colors.txt",
  "transitColorsPath": "../default/transit_colors.txt",
  "patternsPath": "../default/patterns.txt"
}

Data:

• New styles dir for compiled styles. This folder (or its subfolders) will be bundled into the app

├── common
│   └── ...
├── default
│   ├── colors.txt
│   ├── dark
│   │   ├── drules.bin
│   │   └── symbols/
│   ├── light
│   │   ├── drules.bin
│   │   └── symbols/
│   ├── patterns.txt
│   ├── style.json
│   └── transit_colors.txt
├── merged
├── outdoors
└── vehicle

• Styles' sources are moved into styles-raw. This folder won't be bundled into the app. Do you have a better name for styles-raw?

Libs:

• New styles lib

Tools:

• Updated scripts to support new folder structure
• Updated skin_generator tool
• Updated kothic: add options to specify output paths for some files kothic#34

Android:

• Updated assets

iOS:

• Created a new shell script build step to copy styles into resources dir

Limitations:

• As I already said, this is just a first step. Dynamic styles are not supported yet. The 3 styles we have are hardcoded and even if you add a new style you won't be able to use it

[AndrewShkrob]

@vng @biodranik Are you interested in this feature?

[vng]

• colors, patterns (probably some else) files are needed in general (drape)- not depending on particular style.
• move drules_proto_* into corresponding folders - maybe ok, depends on pros.
• Why Theme was added to the C++ core? Core is about map, not UI.

[AndrewShkrob]

Why Theme was added to the C++ core? Core is about map, not UI.

Then why do we have map style in the core? I did not add anything new. I only changed the interface
Previously

MapStyleNormalLight
MapStyleNormalDark
MapStyleDrivingLight
MapStyleDrivingDark
....

Now

MapStyleNormal
MapStyleDriving

MapThemeLight
MapThemeDark