Attachment 64867 Details for Bug 181166 – Some code to check if a glyph exists for a given char

Some code to check if a glyph exists for a given char

Main.java (text/plain), 4.86 KB, created by Rob McKay

on 2007-04-25 09:55:42 EDT

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Creator: Rob McKay

Created: 2007-04-25 09:55:42 EDT

Size: 4.86 KB

patch

obsolete

>package checkIfCharExistsInFont;
>
>/**
> * Test code for windows Font.canDisplay(char c)
> * 
> *  @author Rob McKay
> */
>
>import org.eclipse.swt.SWT;
>import org.eclipse.swt.graphics.Font;
>import org.eclipse.swt.graphics.GC;
>import org.eclipse.swt.internal.win32.OS;
>import org.eclipse.swt.internal.win32.SCRIPT_ANALYSIS;
>import org.eclipse.swt.internal.win32.SCRIPT_CONTROL;
>import org.eclipse.swt.internal.win32.SCRIPT_FONTPROPERTIES;
>import org.eclipse.swt.internal.win32.SCRIPT_ITEM;
>import org.eclipse.swt.internal.win32.SCRIPT_STATE;
>import org.eclipse.swt.layout.RowLayout;
>import org.eclipse.swt.widgets.Display;
>import org.eclipse.swt.widgets.Label;
>import org.eclipse.swt.widgets.Shell;
>
>
>public class Main
>{
>
>private static final int maxGlyphs = 10;
>
>/**
> * Checks if this <code>Font</code> has a glyph for the specified character.
> * 
> * @param font - the font to check
> * @param c - the character for which a glyph is needed
> * @return	<code>true</code> if this Font has a glyph for this character; <code>false</code> otherwise.
> */
>
>static boolean canDisplay(Font font, char c)
>{
>	GC gc = new GC(Display.getCurrent());
>	
>	OS.SelectObject(gc.handle, font.handle);
>	
>	SCRIPT_CONTROL control = new SCRIPT_CONTROL();
>	SCRIPT_STATE state = new SCRIPT_STATE();
>	
>	state.uBidiLevel = 0;
>	state.fOverrideDirection = true;
>	state.fInhibitSymSwap = true;
>	
>	int hHeap = OS.GetProcessHeap();
>	int psc = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, 4);
>	
>	SCRIPT_FONTPROPERTIES sfp = new SCRIPT_FONTPROPERTIES();
>	sfp.cBytes = SCRIPT_FONTPROPERTIES.sizeof;
>	
>	int result = OS.ScriptGetFontProperties(gc.handle, psc, sfp);
>
>	if (result != OS.S_OK)
>		return false;
>	
>	int pItems = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, maxGlyphs * SCRIPT_ITEM.sizeof);
>	int[] pcItems = new int[1];	
>	char[] chars = new char[1];
>	chars[0] = c;
>	pcItems[0] = 0;
>	
>	result = OS.ScriptItemize(chars, chars.length, maxGlyphs, control, state, pItems, pcItems);
>
>	if (result != OS.S_OK || pcItems[0] < 1)
>	{
>		OS.HeapFree(hHeap, 0, pItems);
>		OS.ScriptFreeCache(psc);
>		OS.HeapFree(hHeap, 0, psc);
>		gc.dispose();
>		return false;
>	}
>	
>	SCRIPT_ITEM scriptItem = new SCRIPT_ITEM();
>	scriptItem.a = new SCRIPT_ANALYSIS();
>	
>	OS.MoveMemory(scriptItem, pItems, SCRIPT_ITEM.sizeof);
>	OS.HeapFree(hHeap, 0, pItems);
>
>	int glyphs = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, maxGlyphs * 2);
>	int clusters = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, maxGlyphs * 2);
>	int visAttrs = OS.HeapAlloc(hHeap, OS.HEAP_ZERO_MEMORY, maxGlyphs * 2);
>	int[] buffer = new int[1];
>	
>	result = OS.ScriptShape(gc.handle, psc, chars, chars.length, maxGlyphs, scriptItem.a, glyphs, clusters, visAttrs, buffer);
>
>	OS.ScriptFreeCache(psc);
>	
>	short i[] = new short[1];
>	OS.MoveMemory(i, glyphs, 2);
>	
>	OS.HeapFree(hHeap, 0, glyphs);
>	OS.HeapFree(hHeap, 0, clusters);
>	OS.HeapFree(hHeap, 0, visAttrs);
>	OS.HeapFree(hHeap, 0, psc);
>
>	gc.dispose();
>	
>	if (buffer[0] == 0)
>		return false;
>	
>	if (result != OS.S_OK)
>		return false;
>	
>	return i[0] != sfp.wgDefault;
>}
>
>static void addLabels(Shell shell, Font f1)
>{
>	boolean isSpcDefined = canDisplay(f1, ' ');
>	boolean isSup9Defined = canDisplay(f1, '\u2079');
>	boolean is3dAngleDefined = canDisplay(f1, '\u27c0');
>
>	Label l = new Label(shell, SWT.NONE);
>	l.setText(f1.getFontData()[0].getName());
>	l.setFont(f1);
>	
>	for (char a = 'a'; a <= 'c'; a++)
>	{
>		l = new Label(shell, SWT.NONE);
>		l.setText("" + a + " = " + canDisplay(f1, a));
>		l.setFont(f1);
>	}
>	l = new Label(shell, SWT.NONE);
>	l.setText("<spc> = " + isSpcDefined);
>	l.setFont(f1);
>	l = new Label(shell, SWT.NONE);
>	l.setText("<sup>9 (\u2079) = " + isSup9Defined);
>	l.setFont(f1);
>	l = new Label(shell, SWT.NONE);
>	l.setText("<3D Angle> (\u27c0) = " + is3dAngleDefined);
>	l.setFont(f1);
>
>	l = new Label(shell, SWT.NONE);
>	l.setText("<divide> (\u00f7) = " + canDisplay(f1, '\u00f7'));
>	l.setFont(f1);
>	
>	l = new Label(shell, SWT.NONE);
>	l.setText("<lte> (\u2264) = " + canDisplay(f1, '\u2264'));
>	l.setFont(f1);
>
>	l = new Label(shell, SWT.NONE);
>}
>
>/**
> * @param args
> */
>public static void main(String[] args)
>{
>	Display.setAppName("Font test");
>	Display display = new Display();
>	
>	Shell shell = new Shell(display, SWT.SHELL_TRIM | SWT.DOUBLE_BUFFERED);
>	shell.setText("Font character test");
>	shell.setLayout(new RowLayout(SWT.VERTICAL));
>
>	Font f1 = display.getSystemFont(); //new Font(display, "Arial", 12, SWT.NORMAL);
>	addLabels(shell,f1);
>	
>	f1 = new Font(display, "Arial", 10, SWT.NORMAL);
>	addLabels(shell,f1);
>
>	f1 = new Font(display, "Arial Unicode MS", 10, SWT.NORMAL);
>	addLabels(shell,f1);
>	
>	f1 = new Font(display, "Lucida Sans Unicode", 10, SWT.NORMAL);
>	addLabels(shell,f1);
>		
>	shell.open();
>	while (!shell.isDisposed())
>	{
>		if (!display.readAndDispatch())
>			display.sleep();
>	}
>	display.dispose();
>	System.exit(0);
>	
>}
>
>}

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Attachments on bug 181166: 64867