From 477b77e7e1bdd3ec42105bdfc2897d72161599e4 Mon Sep 17 00:00:00 2001
From: Chicken-Bomes <mehvids@gmail.com>
Date: Wed, 15 Jan 2014 17:41:27 +1000
Subject: [PATCH] Added 9Seg Canvas

---
 codechicken/lib/gui/Canvas9Seg.java | 78 +++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 codechicken/lib/gui/Canvas9Seg.java

diff --git a/codechicken/lib/gui/Canvas9Seg.java b/codechicken/lib/gui/Canvas9Seg.java
new file mode 100644
index 0000000..b558197
--- /dev/null
+++ b/codechicken/lib/gui/Canvas9Seg.java
@@ -0,0 +1,78 @@
+package codechicken.lib.gui;
+
+import codechicken.lib.render.CCRenderState;
+import codechicken.lib.render.TextureDataHolder;
+import codechicken.lib.render.TextureUtils;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.util.ResourceLocation;
+
+public class Canvas9Seg
+{
+    public final ResourceLocation tex;
+    public float[] seg_u = new float[4];
+    public float[] seg_v = new float[4];
+    public int[] seg_w = new int[3];
+    public int[] seg_h = new int[3];
+
+    public Canvas9Seg(ResourceLocation tex) {
+        this.tex = tex;
+        load();
+    }
+
+    private int[] readMarkers(TextureDataHolder data, int stride, int size) {
+        int[] markers = new int[4];
+
+        int marker = 1;
+        int prev_col = data.data[0];
+        for(int i = 1; i < size; i++) {
+            if(data.data[i*stride] != prev_col) {
+                markers[marker] = i;
+                prev_col = data.data[i*stride];
+                if(++marker == 4)
+                    break;
+            }
+        }
+
+        markers[0] += 1;
+        markers[3] -= 1;
+        return markers;
+    }
+
+    private void parseMarkers(TextureDataHolder data, int stride, int size, int[] sizes, float[] texcoords) {
+        int[] markers = readMarkers(data, stride, size);
+        for(int i = 0; i < 4; i++) {
+            texcoords[i] = markers[i]/(float)size;
+            if(i > 0)
+                sizes[i-1] = markers[i]-markers[i-1];
+        }
+    }
+
+    private void load() {
+        TextureDataHolder data = TextureUtils.loadTexture(tex);
+        parseMarkers(data, 1, data.width, seg_w, seg_u);
+        parseMarkers(data, data.width, data.height, seg_h, seg_v);
+    }
+
+    private void drawSeg(int[] sw, int[] sh, int seg) {
+        Tessellator t = Tessellator.instance;
+        int u = seg%3; int v = seg/3;
+        t.addVertexWithUV(sw[u], sh[v], 0, seg_u[u], seg_v[v]);
+        t.addVertexWithUV(sw[u], sh[v+1], 0, seg_u[u], seg_v[v+1]);
+        t.addVertexWithUV(sw[u+1], sh[v+1], 0, seg_u[u+1], seg_v[v+1]);
+        t.addVertexWithUV(sw[u+1], sh[v], 0, seg_u[u+1], seg_v[v]);
+    }
+
+    public void draw(int x, int y, int w, int h) {
+        CCRenderState.changeTexture(tex);
+        CCRenderState.reset();
+        CCRenderState.startDrawing(7);
+
+        int[] sw = new int[]{x, x+seg_w[0], x+w-seg_w[2], x+w};
+        int[] sh = new int[]{y, y+seg_h[0], y+h-seg_h[2], y+h};
+
+        for(int seg = 0; seg < 9; seg++)
+            drawSeg(sw, sh, seg);
+
+        CCRenderState.draw();
+    }
+}