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