1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*
* QuartzTextLayout.h
* wtf
*
* Created by Evan Jones on Wed Oct 02 2002.
* Copyright (c) 2002 __MyCompanyName__. All rights reserved.
*
*/
#ifndef _QUARTZ_TEXT_LAYOUT_H
#define _QUARTZ_TEXT_LAYOUT_H
#include <Carbon/Carbon.h>
#include "QuartzTextStyle.h"
class QuartzTextLayout
{
public:
/** Create a text layout for drawing on the specified context. */
QuartzTextLayout( CGContextRef context ) : layout( NULL ), unicode_string( NULL ), unicode_length( 0 )
{
gc = context;
OSStatus err;
err = ATSUCreateTextLayout( &layout );
assert( err == noErr && layout != NULL );
setControl( kATSUCGContextTag, sizeof( gc ), &gc );
/*ATSUAttributeTag tag = kATSULineLayoutOptionsTag;
ByteCount size = sizeof( ATSLineLayoutOptions );
ATSLineLayoutOptions rendering = kATSLineHasNoOpticalAlignment; // kATSLineUseDeviceMetrics; | kATSLineFractDisable | kATSLineUseQDRendering
ATSUAttributeValuePtr valuePtr = &rendering;
err = ATSUSetLayoutControls( layout, 1, &tag, &size, &valuePtr );
assert( err == noErr );*/
}
~QuartzTextLayout()
{
assert( layout != NULL );
ATSUDisposeTextLayout( layout );
layout = NULL;
if ( unicode_string != NULL )
{
delete[] unicode_string;
unicode_string = NULL;
unicode_length = 0;
}
}
/** Assign a string to the text layout object. */
// TODO: Create a UTF8 version
// TODO: Optimise the ASCII version by not copying so much
OSStatus setText( const UInt8* buffer, size_t byteLength, CFStringEncoding encoding )
{
assert( buffer != NULL && byteLength > 0 );
CFStringRef str = CFStringCreateWithBytes( NULL, buffer, byteLength, encoding, false );
if (!str)
return -1;
unicode_length = CFStringGetLength( str );
unicode_string = new UniChar[ unicode_length ];
CFStringGetCharacters( str, CFRangeMake( 0, unicode_length ), unicode_string );
CFRelease( str );
str = NULL;
OSStatus err;
err = ATSUSetTextPointerLocation( layout, unicode_string, kATSUFromTextBeginning, kATSUToTextEnd, unicode_length );
if( err != noErr ) return err;
// Turn on the default font fallbacks
return ATSUSetTransientFontMatching( layout, true );
}
/** Apply the specified text style on the entire range of text. */
void setStyle( const QuartzTextStyle& style )
{
OSStatus err;
err = ATSUSetRunStyle( layout, style.getATSUStyle(), kATSUFromTextBeginning, kATSUToTextEnd );
assert( err == noErr );
}
/** Draw the text layout into the current CGContext at the specified position, flipping the CGContext's Y axis if required.
* @param x The x axis position to draw the baseline in the current CGContext.
* @param y The y axis position to draw the baseline in the current CGContext.
* @param flipTextYAxis If true, the CGContext's Y axis will be flipped before drawing the text, and restored afterwards. Use this when drawing in an HIView's CGContext, where the origin is the top left corner. */
void draw( float x, float y, bool flipTextYAxis = false )
{
if ( flipTextYAxis )
{
CGContextSaveGState( gc );
CGContextScaleCTM( gc, 1.0, -1.0 );
y = -y;
}
OSStatus err;
err = ATSUDrawText( layout, kATSUFromTextBeginning, kATSUToTextEnd, X2Fix( x ), X2Fix( y ) );
assert( err == noErr );
if ( flipTextYAxis ) CGContextRestoreGState( gc );
}
/** Sets a single text layout control on the ATSUTextLayout object.
* @param tag The control to set.
* @param size The size of the parameter pointed to by value.
* @param value A pointer to the new value for the control.
*/
void setControl( ATSUAttributeTag tag, ByteCount size, ATSUAttributeValuePtr value )
{
OSStatus err;
err = ATSUSetLayoutControls( layout, 1, &tag, &size, &value );
assert( noErr == err );
}
ATSUTextLayout getLayout() {
return layout;
}
private:
ATSUTextLayout layout;
UniChar* unicode_string;
int unicode_length;
CGContextRef gc;
};
#endif
|
