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Date: Sun, 9 Sep 2007 02:08:29 -0700 (PDT)
From: "Igor V. Stolyarov (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Updated: (HARMONY-4741) [classlib][awt] Graphics XORMode
 drawing doesn't implemented
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     [ https://issues.apache.org/jira/browse/HARMONY-4741?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Igor V. Stolyarov updated HARMONY-4741:
---------------------------------------

    Attachment: H-4741.patch

Attached patch contains implementation XORMode drawing for Component's and BufferedImage's Graphics.

Implementation notes: 
According to Specification, the setXORMode(Color xorcolor) method is implemented as a convenience method to set a special Composite object that ignores the Alpha components of source colors and sets the destination color to the value: 
 dstpixel = (PixelOf(srccolor) ^ PixelOf(xorcolor) ^ dstpixel);

But black box testing shows - Alpha components of source colors don't ignore. If SRC Alpha component < 128,
pixel considers as fully transparent and it doesn't draw and pixel considers opaque in other cases and drawing XOR composite of SRC, DST and XOR Color.

Our implementation works the same way as RI implementation.

> [classlib][awt] Graphics XORMode drawing doesn't implemented
> ------------------------------------------------------------
>
>                 Key: HARMONY-4741
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4741
>             Project: Harmony
>          Issue Type: Bug
>            Reporter: Igor V. Stolyarov
>         Attachments: H-4741.patch, Harmony.JPG, RI.JPG
>
>
> Graphics XORMode drawing doesn't implemented
> Simple reproducer:
> import java.awt.*; 
> import java.awt.image.BufferedImage; 
> import java.awt.event.*; 
> import javax.swing.JFrame; 
> public class XORModeTest { 
>     public static void main(String[] args) { 
>         final Font font = new Font("Dialog",Font.PLAIN, 12); 
>         JFrame f = new JFrame("XORModeTest"){ 
>             public void paint(Graphics g){ 
>                 Graphics2D g2d = (Graphics2D)g; 
>                 BufferedImage bi = new BufferedImage(200,200,BufferedImage.TYPE_INT_ARGB); 
>                 Graphics2D g2 = bi.createGraphics(); 
>                 g2.setFont(font); 
>                 g2.setColor(Color.green); 
>                 g2.fillRect(30, 30, 100, 100);
>                 g2.setColor(Color.red); 
>                 g2.drawString("Test", 50, 80); 
>                 g2d.setXORMode(Color.blue); 
>                 g2d.drawImage(bi,0,0,null); 
>             } 
>         }; 
>              
>         f.setBounds(0, 0, 300, 300); 
>         f.setVisible(true); 
>         f.addWindowListener(new WindowAdapter() { 
>             public void windowClosing(WindowEvent ev) { 
>                 System.exit(0); 
>             } 
>         }); 
>     } 
> } 

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