Untiy-文本转Texture

网上找了很久，没有找到比较现成的方案，于是自己做了以种方案，由于比较急，所以自由度不是很高，希望以后能找到更好的方法～

其中一篇文章：http://blog.almostlogical.com/2010/08/20/adding-text-to-texture-at-runtime-in-unity3d-without-using-render-texture/

1.首先用BMFont生成所需文件

参考：http://www.cnblogs.com/hejianchun/articles/3022732.html

2.利用Unity生成自定义字体CustomFont

参考：http://blog.sina.com.cn/s/blog_89d90b7c0102vk20.html

原博主没有给出BMFontReader的库，我这里收集了一下打包放出来
[链接: https://pan.baidu.com/s/1hsjqNeG 密码: rtaq]

另外响应原博主号召，把自定义字体的数据导入功能写成了菜单，使用起来方便一些：

using UnityEngine;
using System.Collections;
using UnityEditor;
using UnityEngine.UI;

public class MakeCustomFont : EditorWindow {

    static MakeCustomFont() {   
    }  

    [MenuItem("Function/Make CustomFont")]  
    private static void ShowWindow() {  
        MakeCustomFont cw=   EditorWindow.GetWindow<MakeCustomFont>(true, "Make CustomFont");  

    }  
    TextAsset txt;
    static TextAsset sTxt;  
    Material png;  
    static Material sPng;  
    Font font;
    static Font sFont;
    private void OnGUI() {  
        GUILayout.Space(10);  
        GUILayout.Label("描述文件:");  
        txt = (TextAsset)EditorGUILayout.ObjectField(txt, typeof(TextAsset), true, GUILayout.MinWidth(100f));  
        sTxt = txt;
        GUILayout.Space(10);  
        GUILayout.Label("材质:");  
        png = (Material)EditorGUILayout.ObjectField(png,typeof(Material),true, GUILayout.MinWidth(100f));  
        sPng = png;
        GUILayout.Space(10); 
        GUILayout.Label("字体:");  
        font = (Font)EditorGUILayout.ObjectField(font,typeof(Font),true, GUILayout.MinWidth(100f));  
        sFont = font;
        GUILayout.Space(10); 
        if (GUILayout.Button("创建字体！")) {  
            Change();  
        }  
    }  
    public static void Change() {  
        if (sTxt == null || sPng == null || sFont == null) {
            Debug.LogError ("不完整的参数");
            return;
        }
        BMFont mbFont = new BMFont();  
        BMFontReader.Load(mbFont, sTxt.name, sTxt.bytes);  // 借用NGUI封装的读取类
        CharacterInfo[] characterInfo = new CharacterInfo[mbFont.glyphs.Count];  
        for (int i = 0; i < mbFont.glyphs.Count; i++)  
        {  
            BMGlyph bmInfo = mbFont.glyphs[i];  
            CharacterInfo info = new CharacterInfo();  
            info.index = bmInfo.index;  
            info.uv.x = (float)bmInfo.x / (float)mbFont.texWidth;  
            info.uv.y = 1-(float)bmInfo.y / (float)mbFont.texHeight;  
            info.uv.width = (float)bmInfo.width / (float)mbFont.texWidth;  
            info.uv.height = -1f * (float)bmInfo.height / (float)mbFont.texHeight;  
            info.vert.x = (float)bmInfo.offsetX;  
            //info.vert.y = (float)bmInfo.offsetY;  
            info.vert.y = 0f;//自定义字库UV从下往上，所以这里不需要偏移，填0即可。 
            info.vert.width = (float)bmInfo.width;  
            info.vert.height = (float)bmInfo.height;  
            info.width = (float)bmInfo.advance;  
            characterInfo[i] = info;  
        }  
        sFont.characterInfo = characterInfo;   
        sFont.material = sPng;
    }   
}

3.最终自己把转化过程实现一下

由于时间关系，没有做很大的自由度，不支持换行等特殊字符功能

//自定义字体文字转贴图
    public static Texture2D TextToTexture(this Font target,string text,Color color)
    {
        //字体贴图／／只支持自定义字体CustomFont
        Texture2D t = (Texture2D)target.material.mainTexture;

        char letter;
        int width = 0;
        int height = 0;
        //计算图片长宽／／暂不支持换行
        for (int n = 0; n < text.Length; n++) {
            letter = text [n];
            CharacterInfo c = new CharacterInfo ();

            if (target.GetCharacterInfo (letter,out c)) {
                width += c.advance;
                if (c.vert.height > height) {
                    height = (int)c.vert.height;
                }
            }
        }
        //创建字体
        Texture2D fontTexture = new Texture2D (width,height);
        int widthCurrent = 0;
        for (int n = 0; n < text.Length; n++) {
            letter = text [n];
            CharacterInfo c = new CharacterInfo ();

            if (target.GetCharacterInfo (letter, out c)) {
                for (int x = 0; x < c.advance; x++) {
                    for (int y = 0; y < height; y++) {
                        if (y > c.minY || y < c.maxY||x < c.minX || x > c.maxX) {
                            fontTexture.SetPixel (widthCurrent+x,y,new Color(0,0,0,0));
                            continue;
                        }
                        fontTexture.SetPixel (widthCurrent+x,y,new Color(color.a,color.g,color.b,t.GetPixelBilinear((c.uvTopLeft.x + (c.uvTopRight.x - c.uvTopLeft.x) * (x - c.minX) / (c.maxX - c.minX)),(c.uvTopLeft.y + (c.uvBottomLeft.y - c.uvTopLeft.y) * (y - c.maxY) / (c.minY - c.maxY))).a));
                    }
                }
                widthCurrent += c.advance;
            }

        }
        fontTexture.Apply ();
        return fontTexture;
    }