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/*
* QuartzTextLayout.h
*
* Original Code by Evan Jones on Wed Oct 02 2002.
* Contributors:
* Shane Caraveo, ActiveState
* Bernd Paradies, Adobe
*
*/
#ifndef QUARTZTEXTLAYOUT_H
#define QUARTZTEXTLAYOUT_H
#include <Cocoa/Cocoa.h>
#include "QuartzTextStyle.h"
class QuartzTextLayout {
public:
/** Create a text layout for drawing. */
QuartzTextLayout() : mString(NULL), mLine(NULL), stringLength(0) {
}
~QuartzTextLayout() {
if (mString) {
CFRelease(mString);
mString = NULL;
}
if (mLine) {
CFRelease(mLine);
mLine = NULL;
}
}
CFStringEncoding setText(std::string_view sv, CFStringEncoding encoding, const QuartzTextStyle &r) {
// First clear current values in case of failure.
if (mString) {
CFRelease(mString);
mString = NULL;
}
if (mLine) {
CFRelease(mLine);
mLine = NULL;
}
const UInt8 *puiBuffer = reinterpret_cast<const UInt8 *>(sv.data());
CFStringRef str = CFStringCreateWithBytes(NULL, puiBuffer, sv.length(), encoding, false);
if (!str) {
// Failed to decode bytes into string with given encoding so try
// MacRoman which should accept any byte.
encoding = kCFStringEncodingMacRoman;
str = CFStringCreateWithBytes(NULL, puiBuffer, sv.length(), encoding, false);
}
if (!str) {
return encoding;
}
stringLength = CFStringGetLength(str);
CFMutableDictionaryRef stringAttribs = r.getCTStyle();
mString = ::CFAttributedStringCreate(NULL, str, stringAttribs);
mLine = ::CTLineCreateWithAttributedString(mString);
CFRelease(str);
return encoding;
}
/** Draw the text layout into a CGContext at the specified position.
* @param gc The CGContext in which to draw the text.
* @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. */
void draw(CGContextRef gc, float x, float y) {
if (!mLine)
return;
::CGContextSetTextMatrix(gc, CGAffineTransformMakeScale(1.0, -1.0));
// Set the text drawing position.
::CGContextSetTextPosition(gc, x, y);
// And finally, draw!
::CTLineDraw(mLine, gc);
}
float MeasureStringWidth() {
if (mLine == NULL)
return 0.0f;
return static_cast<float>(::CTLineGetTypographicBounds(mLine, NULL, NULL, NULL));
}
CTLineRef getCTLine() {
return mLine;
}
CFIndex getStringLength() {
return stringLength;
}
private:
CFAttributedStringRef mString;
CTLineRef mLine;
CFIndex stringLength;
};
#endif
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