mirror of https://github.com/fltk/fltk
STR #1305: partial fix.
FLTK on Mac with --enable-quartz now uses ATSU instead of CG to render text. First of all, it is a lot faster, but more importantly, character positions are now all at integer positions. This is not as beatiful as standard Mac text, but required by the FLTK internals. I seriously doubt that anyone who's not a typesette will notice the difference. But - and there's always a but, isn't there? This commit does not handle the ASCII-to-UTF16 conversion yet, so all characters above 127 are junk. Also, there are still a lot of problems with the Quartz support in general. Most prominently, we still get a lot of messages about invalid contexts which ruins the clipping. So in conclusion (this must be the longest SVN commit annotation ever) this modification fixes the main reason why I did not finish the Quartz port. After fixing this, there's hope that we will wrap even that dirty little corner of FLTK up for good! git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5171 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
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@ -60,9 +60,11 @@ public:
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bool knowMetrics;
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# elif defined(__APPLE_QUARTZ__)
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FL_EXPORT Fl_FontSize(const char* fontname, int size);
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ATSUTextLayout layout;
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ATSUStyle style;
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short ascent, descent, q_width;
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char *q_name;
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int size;
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short ascent, descent, q_width;
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# elif USE_XFT
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XftFont* font;
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const char* encoding;
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@ -57,24 +57,53 @@ Fl_FontSize::Fl_FontSize(const char* name, int Size) {
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for (int i=0; i<256; i++) width[i] = fOut->widMax;
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minsize = maxsize = size;
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#elif defined(__APPLE_QUARTZ__)
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// OpenGL needs those for its font handling
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q_name = strdup(name);
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size = Size;
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OSStatus err;
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// fill our structure with a few default values
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ascent = Size*3/4;
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descent = Size-ascent;
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q_width = Size*2/3;
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minsize = maxsize = Size;
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// Using ATS to get the genral Glyph size information
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CFStringRef cfname = CFStringCreateWithCString(0L, q_name, kCFStringEncodingASCII);
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// now use ATS to get the actual Glyph size information
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CFStringRef cfname = CFStringCreateWithCString(0L, name, kCFStringEncodingASCII);
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ATSFontRef font = ATSFontFindFromName(cfname, kATSOptionFlagsDefault);
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if (font) {
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ATSFontMetrics m = { 0 };
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ATSFontGetHorizontalMetrics(font, kATSOptionFlagsDefault, &m);
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if (m.avgAdvanceWidth) q_width = int(m.avgAdvanceWidth*size);
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// playing with the offsets a little to make standard sizes fit
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if (m.ascent) ascent = int(m.ascent*size-0.5f);
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if (m.descent) descent = -int(m.descent*size-1.5f);
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if (m.avgAdvanceWidth) q_width = int(m.avgAdvanceWidth*Size);
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// playing with the offsets a little to make standard sizes fit
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if (m.ascent) ascent = int(m.ascent*Size-0.5f);
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if (m.descent) descent = -int(m.descent*Size-1.5f);
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}
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CFRelease(cfname);
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// now we allocate everything needed to render text in this font later
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// get us the default layout and style
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err = ATSUCreateTextLayout(&layout);
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UniChar mTxt[2] = { 65, 0 };
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err = ATSUSetTextPointerLocation(layout, mTxt, kATSUFromTextBeginning, 1, 1);
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err = ATSUCreateStyle(&style);
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err = ATSUSetRunStyle(layout, style, kATSUFromTextBeginning, kATSUToTextEnd);
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// now set the actual font, size and attributes
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Fixed fsize = IntToFixed(Size);
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ATSUFontID fontID = FMGetFontFromATSFontRef(font);
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ATSUAttributeTag sTag[] = { kATSUFontTag, kATSUSizeTag };
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ByteCount sBytes[] = { sizeof(ATSUFontID), sizeof(Fixed) };
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ATSUAttributeValuePtr sAttr[] = { &fontID, &fsize };
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err = ATSUSetAttributes(style, 2, sTag, sBytes, sAttr);
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// next, make sure that Quartz will only render at integer coordinates
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ATSLineLayoutOptions llo = kATSLineUseDeviceMetrics|kATSLineDisableAllLayoutOperations;
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ATSUAttributeTag aTag[] = { kATSULineLayoutOptionsTag };
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ByteCount aBytes[] = { sizeof(ATSLineLayoutOptions) };
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ATSUAttributeValuePtr aAttr[] = { &llo };
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err = ATSUSetLineControls (layout, kATSUFromTextBeginning, 1, aTag, aBytes, aAttr);
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// now we are finally ready to measure some letter to get the bounding box
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Fixed bBefore, bAfter, bAscent, bDescent;
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err = ATSUGetUnjustifiedBounds(layout, kATSUFromTextBeginning, 1, &bBefore, &bAfter, &bAscent, &bDescent);
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ascent = FixedToInt(bAscent);
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descent = FixedToInt(bDescent);
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q_width = FixedToInt(bAfter);
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#endif
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}
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@ -97,7 +126,8 @@ Fl_FontSize::~Fl_FontSize() {
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*/
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if (this == fl_fontsize) fl_fontsize = 0;
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#ifdef __APPLE_QUARTZ__
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free(q_name);
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ATSUDisposeTextLayout(layout);
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ATSUDisposeStyle(style);
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#endif
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}
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@ -161,9 +191,7 @@ void fl_font(Fl_FontSize* s) {
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fl_fontsize->knowMetrics = 1;
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}
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#elif defined(__APPLE_QUARTZ__)
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if (!s) return;
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if (!fl_gc) return; // no worries, we will assign the font to the context later
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CGContextSelectFont(fl_gc, s->q_name, (float)s->size, kCGEncodingMacRoman);
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// we will use fl_fontsize later to access the required style and layout
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#else
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# error : need to defined either Quartz or Quickdraw
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#endif
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@ -212,14 +240,21 @@ double fl_width(const char* txt, int n) {
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if (w) w->make_current();
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if (!fl_gc) return -1;
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}
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// according to the Apple developer docs, this is the correct way to
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// find the length of a rendered text...
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CGContextSetTextPosition(fl_gc, 0, 0);
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CGContextSetTextDrawingMode(fl_gc, kCGTextInvisible);
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CGContextShowText(fl_gc, txt, n);
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CGContextSetTextDrawingMode(fl_gc, kCGTextFill);
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CGPoint p = CGContextGetTextPosition(fl_gc);
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return p.x;
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OSStatus err;
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// convert to UTF-16 first
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int i;
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UniChar uniStr[n+1];
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for (i=0; i<n; i++) {
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uniStr[i] = txt[i];
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}
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uniStr[i] = 0;
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// now collect our ATSU resources
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ATSUTextLayout layout = fl_fontsize->layout;
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err = ATSUSetTextPointerLocation(layout, uniStr, kATSUFromTextBeginning, n, n);
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// now measure the bounding box
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Fixed bBefore, bAfter, bAscent, bDescent;
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err = ATSUGetUnjustifiedBounds(layout, kATSUFromTextBeginning, n, &bBefore, &bAfter, &bAscent, &bDescent);
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return FixedToInt(bAfter);
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#endif
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}
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@ -244,7 +279,18 @@ void fl_draw(const char *str, int n, float x, float y) {
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#ifdef __APPLE_QD__
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fl_draw(str, n, (int)x, (int)y);
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#elif defined(__APPLE_QUARTZ__)
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CGContextShowTextAtPoint(fl_gc, x, y, str, n);
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OSStatus err;
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// convert to UTF-16 first
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int i;
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UniChar uniStr[n+1];
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for (i=0; i<n; i++) {
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uniStr[i] = str[i];
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}
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uniStr[i] = 0;
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// now collect our ATSU resources
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ATSUTextLayout layout = fl_fontsize->layout;
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err = ATSUSetTextPointerLocation(layout, uniStr, kATSUFromTextBeginning, n, n);
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err = ATSUDrawText(layout, kATSUFromTextBeginning, n, FloatToFixed(x), FloatToFixed(y));
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#else
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# error : neither Quartz no Quickdraw chosen
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#endif
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