1 files changed, 76 insertions, 0 deletions
diff --git a/src/main/java/eu/olli/cowmoonication/util/ImageUtils.java b/src/main/java/eu/olli/cowmoonication/util/ImageUtils.java
new file mode 100644
index 0000000..cd224e8
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+++ b/src/main/java/eu/olli/cowmoonication/util/ImageUtils.java
@@ -0,0 +1,76 @@
+package eu.olli.cowmoonication.util;
+
+import com.mojang.authlib.minecraft.MinecraftProfileTexture;
+import eu.olli.cowmoonication.Cowmoonication;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.ThreadDownloadImageData;
+import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.fml.relauncher.ReflectionHelper;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class ImageUtils {
+    public static int getTierFromTexture(String minionSkinId) {
+        String textureUrl = "http://textures.minecraft.net/texture/" + minionSkinId;
+        MinecraftProfileTexture minionSkinTextureDetails = new MinecraftProfileTexture(textureUrl, null);
+
+        ResourceLocation minionSkinLocation = Minecraft.getMinecraft().getSkinManager().loadSkin(minionSkinTextureDetails, MinecraftProfileTexture.Type.SKIN);
+
+        ThreadDownloadImageData minionSkinTexture = (ThreadDownloadImageData) Minecraft.getMinecraft().getTextureManager().getTexture(minionSkinLocation);
+        BufferedImage minionSkinImage = ReflectionHelper.getPrivateValue(ThreadDownloadImageData.class, minionSkinTexture, "bufferedImage", "field_110560_d");
+
+        // extract part of the minion tier badge (center 2x2 pixel)
+        BufferedImage minionSkinTierBadge = minionSkinImage.getSubimage(43, 3, 2, 2);
+
+        // reference image for tier badges: each tier is 2x2 pixel
+        ResourceLocation tierBadgesLocation = new ResourceLocation(Cowmoonication.MODID, "minion-tier-badges.png");
+
+        try (InputStream tierBadgesStream = Minecraft.getMinecraft().getResourceManager().getResource(tierBadgesLocation).getInputStream()) {
+            BufferedImage tierBadges = ImageIO.read(tierBadgesStream);
+
+            final int maxTier = 11;
+            for (int tier = 0; tier < maxTier; tier++) {
+                BufferedImage tierBadgeRaw = tierBadges.getSubimage(tier * 2, 0, 2, 2);
+                if (ImageUtils.areEquals(minionSkinTierBadge, tierBadgeRaw)) {
+                    return tier + 1;
+                }
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+            return -1;
+        }
+        return -5;
+    }
+
+    /**
+     * Compares two images pixel by pixel
+     *
+     * @param imageA the first image
+     * @param imageB the second image
+     * @return whether the images are both the same or not
+     * @see <a href="https://stackoverflow.com/a/29886786">Source</a>
+     */
+    private static boolean areEquals(BufferedImage imageA, BufferedImage imageB) {
+        // images must be the same size
+        if (imageA.getWidth() != imageB.getWidth() || imageA.getHeight() != imageB.getHeight()) {
+            return false;
+        }
+
+        int width = imageA.getWidth();
+        int height = imageB.getHeight();
+
+        // loop over every pixel
+        for (int y = 0; y < height; y++) {
+            for (int x = 0; x < width; x++) {
+                // compare the pixels for equality
+                if (imageA.getRGB(x, y) != imageB.getRGB(x, y)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+}