gd - php中如何获得双色图片的mask

在php中如何实现上图的效果？要求：“上”和“爱情”都是通过程序自动输出的，程序能共自动判断画布上得空白部分并输出文字。

在python中，有pygame库直接获得一个画布的mask，然后提供collide函数来判断两个mask是否有交集。php是否有类似功能？

换个问题：
php中如何获得双色图片的mask

回复内容：

在php中如何实现上图的效果？要求：“上”和“爱情”都是通过程序自动输出的，程序能共自动判断画布上得空白部分并输出文字。

在python中，有pygame库直接获得一个画布的mask，然后提供collide函数来判断两个mask是否有交集。php是否有类似功能？

换个问题：
php中如何获得双色图片的mask

更新下算法解释，貌似做成php版的还算简单
http://ued.ctrip.com/blog/?p=2471

携程的算法源码如下：

package com.ctrip;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.imageio.ImageIO;

public class WordsThumb
{
  public static final int MIN_WIDTH = 320;
  public static final int MIN_HEIGHT = 240;
  public static final int MAX_WIDTH = 2560;
  public static final int MAX_HEIGHT = 1920;
  public static final int BLOCK = 4;
  public static final String DEF_FONT = "微软雅黑";
  public static final int MIN_FONT_SIZE = 12;
  private static final int[] COLORS = { 11682842, 14439168, 
    13081114, 10300417, 14450176, 13052357, 11665801, 1739698, 
    101319, 84146, 15580865, 1722823, 6664705, 11257601, 
    7582257, 11665680, 14425600, 10768192, 14360836, 15515347, 
    111266, 49372, 15436032, 15436032 };

  public BufferedImage createWordsThumb(Map words, int width, int height, String fontName, Integer maxFontSize, Integer minFontSize)
  {
    if ((words == null) || (words.size()  2560) || (height  1920))
      return null;
    fontName = validateFontName(fontName, "微软雅黑");
    List sortedWords = sortWordsMap(words);

    BufferedImage bi = createBufferedImage(width, height);
    if (bi == null) {
      return null;
    }
    if (maxFontSize == null) {
      maxFontSize = Integer.valueOf(Math.min(width, height) / 5);
    }
    if (minFontSize == null) {
      minFontSize = Integer.valueOf(Math.min(width, height) / 40);
    }
    if (minFontSize.intValue() > sortWordsMap(Map words) {
    if (words == null)
      return null;
    ArrayList wordsList = new ArrayList(
      words.entrySet());
    Collections.sort(wordsList, 
      new Comparator()
    {
      public int compare(Map.Entry o1, Map.Entry o2)
      {
        return o2 == null ? -1 : o1 == null ? 1 : 
          ((Integer)o2
          .getValue()).intValue() - ((Integer)o1.getValue()).intValue();
      }
    });
    return wordsList;
  }

  private BufferedImage createBufferedImage(int width, int height) {
    BufferedImage bi = new BufferedImage(width, height, 
      2);
    Graphics2D g2 = bi.createGraphics();
    bi = g2.getDeviceConfiguration().createCompatibleImage(width, height, 
      3);
    g2.dispose();
    return bi;
  }

  private int paintWords(BufferedImage bi, List> words, String fontName, int maxFontSize, int minFontSize)
  {
    BitMap bitMap = initBitMap(bi);
    Graphics2D g2 = bi.createGraphics();
    int wordCount = 0;
    int fontSizeAdjust = 0;
    int maxFrequency = ((Integer)((Map.Entry)words.get(0)).getValue()).intValue();
    int minFrequency = ((Integer)((Map.Entry)words.get(words.size() - 1)).getValue()).intValue();
    for (Map.Entry entry : words)
    {
      while (true)
      {
        Font font = initFont(g2, fontName, Integer.valueOf(maxFontSize), Integer.valueOf(minFontSize), 
          (Integer)entry.getValue(), Integer.valueOf(maxFrequency), Integer.valueOf(minFrequency), 
          Integer.valueOf(fontSizeAdjust));
        if (font.getSize()  minFrequency.intValue()) {
      fs = (int)((frequency.intValue() - minFrequency.intValue()) * (
        maxFontSize.intValue() - minFontSize.intValue()) / (
        maxFrequency.intValue() - minFrequency.intValue()) + minFontSize.intValue());
    }
    if (fontSizeAdjust != null) {
      fs += fontSizeAdjust.intValue();
    }
    Font font = new Font(fontName, 1, fs);
    g2.setFont(font);
    g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, 
      RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    return font;
  }

  private Rectangle2D getStringBounds(Graphics2D g2, Font font, String key)
  {
    FontRenderContext frc = g2.getFontRenderContext();

    Rectangle2D rc = font.getStringBounds(key, frc);

    return rc;
  }

  private Rectangle2D findSpace(BitMap bitMap, Rectangle2D rect) {
    int w = pixel2bitMap((int)rect.getWidth());
    int h = pixel2bitMap((int)rect.getHeight());
    int boundW = bitMap.getWidth() - w;
    int boundH = bitMap.getHeight() - h;
    int start_x = boundW / 2;
    int start_y = boundH / 2;

    int maxBound = Math.max(boundW, boundH);
    double wRatio = boundW / maxBound;
    double hRatio = boundH / maxBound;

    double max_r = Math.sin(0.7853981633974483D) * maxBound;
    double r = 1.0D; double a = 0.0D; double a_tmp = 0.0D; double s = 1.0D; double step = 1.0D;
    int x = start_x; int y = start_y;
    while (r  0.7853981633974483D ? 0.7853981633974483D : s / r;
      a += a_tmp;
      r += step * (a_tmp / 6.283185307179586D);
      x = (int)(Math.sin(a) * r * wRatio + start_x);
      y = (int)(Math.cos(a) * r * hRatio + start_y);
    }
    return null;
  }

  private Rectangle2D findSpace2(BitMap bitMap, Rectangle2D rect) {
    int w = pixel2bitMap((int)rect.getWidth());
    int h = pixel2bitMap((int)rect.getHeight());
    int[] bounds = { bitMap.getWidth() - w, 
      bitMap.getHeight() - h };

    int[] step_len = new int[2];
    int marchDir = 0;
    int x;
    int y;
    if (bounds[0] > bounds[1]) {
      int y = bounds[1] / 2;
      int x = y;
      bounds[0] -= bounds[1];
      step_len[1] = 1;
    } else {
      marchDir = 3;
      x = bounds[0] / 2;
      y = x;
      step_len[0] = 1;
      bounds[1] -= bounds[0];
      if (step_len[1] == 0) {
        step_len[1] = 1;
      }
    }

    int[] step = new int[4];
    while (!isClean(bitMap, x, y, w, h)) {
      step[marchDir] += 1;
      if (step[marchDir] > step_len[(marchDir % 2)]) {
        step[marchDir] = 0;
        step_len[(marchDir % 2)] += 1;
        marchDir++; marchDir %= 4;
        if (step_len[(marchDir % 2)] > bounds[(marchDir % 2)]) {
          return null;
        }
      }
      switch (marchDir) {
      case 0:
        x++;
        break;
      case 1:
        y--;
        break;
      case 2:
        x--;
        break;
      case 3:
        y++;
      }

    }

    int targetX = bit2pixel(x);
    int targetY = bit2pixel(y);
    return new Rectangle(targetX, targetY, (int)rect.getWidth(), 
      (int)rect.getHeight());
  }

  private int pixel2bitMap(int v) {
    return (int)Math.ceil(v / 4.0D);
  }

  private boolean isClean(BitMap bitMap, int x, int y, int w, int h) {
    if ((x = bitMap.getWidth()) || (y = bitMap.getHeight()))
      return false;
    for (int i = x; i  bi.getWidth())
      r = bi.getWidth();
    if (b > bi.getHeight())
      b = bi.getHeight();
    if ((r = bi.getWidth()) || (y2 >= bi.getHeight()))
            continue;
          if (bi.getRGB(x + i % 4, y + i / 4) != 0) {
            bitMap.setUsed(pixel2bitMap(x), pixel2bitMap(y), true);
            break;
          }
        }
  }

  public BufferedImage mixImages(BufferedImage[] images, Float[] alphas, int width, int height)
  {
    return mixImages(images, alphas, createBufferedImage(width, height));
  }

  public BufferedImage mixImages(BufferedImage[] images, Float[] alphas, BufferedImage targetImage)
  {
    if ((images == null) || (images.length ...");
      System.out.println("\t-o:\tOutput image file name");
      System.out.println("\t-b:\tBackground image file name");
      System.out.println("\t-m:\tWater mark image file name");
      System.out.println("\t-w:\tWidth of target image");
      System.out.println("\t-h:\tHeight of target image");
      System.out.println("\t-f:\tFont name");
      System.exit(1);
    }

    if (words.size()  words) throws IOException
  {
    BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("请输入词汇和词频，格式为每行一个词、一个空格、一个词频数字，以空行结束输入。");
    String line = null;
    while ((line = rd.readLine()) != null) {
      line = line.trim();
      if ("".equals(line)) {
        System.out.println("好，马上处理！");
        break;
      }
      String[] parts = line.split("\\s+");
      if (parts.length != 2) continue;
      try {
        words.put(parts[0], Integer.valueOf(Integer.parseInt(parts[1])));
      } catch (NumberFormatException e) {
        System.out.println("无效的输入。");
      }
    }
  }
}


package com.ctrip;

import java.io.IOException;
import java.io.PrintStream;

public class BitMap
{
  private byte[][] bitMap;
  private int width;
  private int height;
  private int byteWidth;

  public BitMap(int width, int height)
  {
    if ((width = 0 ? y : 0; for (int y2 = y1 - y; (y1 = 0 ? x : 0; for (int x2 = x1 - x; (x1 = 0 ? y : 0; for (int y2 = y1 - y; (y1 = 0 ? x : 0; for (int x2 = x1 - x; (x1 = this.byteWidth) || (y = this.height))
      throw new IllegalArgumentException();
    int mask = 1 = this.byteWidth) || (y = this.height))
      throw new IllegalArgumentException();
    int mask = 1 
反汇编工具jd-gui
写了一个flex版本的，执行时间大约1~2s，效果如下：

源码layout.mxml：