CustomFontRenderer.java

package slimeknights.tconstruct.library.client;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.FontRenderer;
import net.minecraft.client.renderer.texture.TextureManager;
import net.minecraft.client.resources.IResourceManager;
import net.minecraft.client.settings.GameSettings;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

import java.util.Arrays;
import java.util.List;

import javax.annotation.Nonnull;


/**
 * Custom renderer based on CoFHs CoFHFontRenderer.
 * Uses code from CoFHCore. Credit goes to the CoFH team, KingLemming and RWTema.
 */
@SideOnly(Side.CLIENT)
public class CustomFontRenderer extends FontRenderer {

  private boolean dropShadow;
  private int state = 0;
  private int red;
  private int green;
  private int blue;

  public CustomFontRenderer(GameSettings gameSettingsIn, ResourceLocation location, TextureManager textureManagerIn) {
    super(gameSettingsIn, location, textureManagerIn, true);
  }

  @Nonnull
  @Override
  public List<String> listFormattedStringToWidth(@Nonnull String str, int wrapWidth) {
    return Arrays.asList(this.wrapFormattedStringToWidth(str, wrapWidth).split("\n"));
  }

  protected String wrapFormattedStringToWidth(String str, int wrapWidth) {
    int i = this.sizeStringToWidth(str, wrapWidth);

    if(str.length() <= i) {
      return str;
    }
    else {
      String s = str.substring(0, i);
      char c0 = str.charAt(i);
      boolean flag = c0 == 32 || c0 == 10;
      String s1 = getCustomFormatFromString(s) + str.substring(i + (flag ? 1 : 0));
      return s + "\n" + this.wrapFormattedStringToWidth(s1, wrapWidth);
    }
  }

  public static String getCustomFormatFromString(String text) {
    String s = "";
    int i = 0;
    int j = text.length();

    while((i < j - 1)) {
      char c = text.charAt(i);
      // vanilla formatting
      if(c == 167) {

        char c0 = text.charAt(i + 1);

        if(c0 >= 48 && c0 <= 57 || c0 >= 97 && c0 <= 102 || c0 >= 65 && c0 <= 70) {
          s = "\u00a7" + c0;
          i++;
        }
        else if(c0 >= 107 && c0 <= 111 || c0 >= 75 && c0 <= 79 || c0 == 114 || c0 == 82) {
          s = s + "\u00a7" + c0;
          i++;
        }
      }
      // custom formatting
      else if((int) c >= CustomFontColor.MARKER && (int) c <= CustomFontColor.MARKER + 0xFF) {
        s = String.format("%s%s%s", c, text.charAt(i + 1), text.charAt(i + 2));
        i += 2;
      }
      i++;
    }

    return s;
  }

  @Override
  public int renderString(@Nonnull String text, float x, float y, int color, boolean dropShadow) {
    this.dropShadow = dropShadow;
    return super.renderString(text, x, y, color, dropShadow);
  }

  @Override
  protected float renderUnicodeChar(char letter, boolean italic) {
    // special color settings through char code
    // we use \u2700 to \u27FF, where the lower byte represents the Hue of the color
    if((int) letter >= CustomFontColor.MARKER && (int) letter <= CustomFontColor.MARKER + 0xFF) {
      int value = letter & 0xFF;
      switch(state) {
        case 0:
          red = value;
          break;
        case 1:
          green = value;
          break;
        case 2:
          blue = value;
          break;
        default:
          this.setColor(1f, 1f, 1f, 1f);
          return 0;
      }

      state = ++state % 3;

      int color = (red << 16) | (green << 8) | blue | (0xff << 24);
      if((color & -67108864) == 0) {
        color |= -16777216;
      }

      if(dropShadow) {
        color = (color & 16579836) >> 2 | color & -16777216;
      }

      this.setColor(((color >> 16) & 255) / 255f,
                    ((color >> 8) & 255) / 255f,
                    ((color >> 0) & 255) / 255f,
                    ((color >> 24) & 255) / 255f);
      return 0;
    }

    // invalid sequence encountered
    if(state != 0) {
      state = 0;
      this.setColor(1f, 1f, 1f, 1f);
    }

    return super.renderUnicodeChar(letter, italic);
  }

  @Override
  public void onResourceManagerReload(IResourceManager resourceManager) {
    super.onResourceManagerReload(resourceManager);
    setUnicodeFlag(Minecraft.getMinecraft().getLanguageManager().isCurrentLocaleUnicode() || Minecraft.getMinecraft().gameSettings.forceUnicodeFont);
    setBidiFlag(Minecraft.getMinecraft().getLanguageManager().isCurrentLanguageBidirectional());
  }
}