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Fixed surrogate pair drawing on OS X.

This commit is contained in:
Pietro Gagliardi 2016-05-23 01:11:43 -04:00
parent e3bcf31764
commit 5d63fe4cec
2 changed files with 43 additions and 4 deletions
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3
README.md
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@ -18,6 +18,9 @@ This README is being written.<br>
*Note that today's entry may be updated later today.*
* **23 May 2016**
* Fixed surrogate pair drawing on OS X.
* **22 May 2016**
* Removed `uiControlVerifyDestroy()`; that is now part of `uiFreeControl()` itself.
* Added `uiPi`, a constant for π. This is provided for C and C++ programmers, where there is no standard named constant for π; bindings authors shouldn't need to worry about this.

44
darwin/drawtext.m
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@ -442,15 +442,17 @@ void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metri
struct uiDrawTextLayout {
CFMutableAttributedStringRef mas;
CFRange *charsToRanges;
double width;
};
uiDrawTextLayout *uiDrawNewTextLayout(const char *str, uiDrawTextFont *defaultFont, double width)
{
uiDrawTextLayout *layout;
//TODO CFStringRef cfstr;
CFAttributedStringRef immutable;
CFMutableDictionaryRef attr;
CFStringRef backing;
CFIndex i, j, n;
layout = uiNew(uiDrawTextLayout);
@ -458,11 +460,9 @@ uiDrawTextLayout *uiDrawNewTextLayout(const char *str, uiDrawTextFont *defaultFo
// this will retain defaultFont->f; no need to worry
CFDictionaryAddValue(attr, kCTFontAttributeName, defaultFont->f);
// TODO convert the NSString call to a CFString call
immutable = CFAttributedStringCreate(NULL, (CFStringRef) [NSString stringWithUTF8String:str], attr);
if (immutable == NULL)
complain("error creating immutable attributed string in uiDrawNewTextLayout()");
//TODO CFRelease(cfstr);
CFRelease(attr);
layout->mas = CFAttributedStringCreateMutableCopy(NULL, 0, immutable);
@ -472,11 +472,34 @@ uiDrawTextLayout *uiDrawNewTextLayout(const char *str, uiDrawTextFont *defaultFo
uiDrawTextLayoutSetWidth(layout, width);
// unfortunately the CFRanges for attributes expect UTF-16 codepoints
// we want full characters
// fortunately CFStringGetRangeOfComposedCharactersAtIndex() is here for us
backing = CFAttributedStringGetString(layout->mas);
n = CFStringGetLength(backing);
// allocate one extra, just to be safe
layout->charsToRanges = (CFRange *) uiAlloc((n + 1) * sizeof (CFRange), "CFRange[]");
i = 0;
j = 0;
while (i < n) {
CFRange range;
range = CFStringGetRangeOfComposedCharactersAtIndex(backing, i);
i = range.location + range.length;
layout->charsToRanges[j] = range;
j++;
}
// and set the last one
layout->charsToRanges[j].location = i;
layout->charsToRanges[j].length = 0;
// TODO how will this affect drawing things that aren't surrogate pairs?
return layout;
}
void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
{
uiFree(layout->charsToRanges);
CFRelease(layout->mas);
uiFree(layout);
}
@ -604,7 +627,20 @@ void doDrawText(CGContextRef c, CGFloat cheight, double x, double y, uiDrawTextL
CGContextSetTextPosition(c, x, y);
#endif
#define rangeToCFRange() CFRangeMake(startChar, endChar - startChar)
static CFRange charsToRange(uiDrawTextLayout *layout, intmax_t startChar, intmax_t endChar)
{
CFRange start, end;
CFRange out;
start = layout->charsToRanges[startChar];
end = layout->charsToRanges[endChar];
out.location = start.location;
// - 1 to avoid including the first code point after end
out.length = (end.location + end.length - 1) - start.location;
return out;
}
#define rangeToCFRange() charsToRange(layout, startChar, endChar)
void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, intmax_t startChar, intmax_t endChar, double r, double g, double b, double a)
{