diff options
Diffstat (limited to 'src/libui_sdl/libui/darwin/drawtext.m')
| -rw-r--r-- | src/libui_sdl/libui/darwin/drawtext.m | 655 |
1 files changed, 0 insertions, 655 deletions
diff --git a/src/libui_sdl/libui/darwin/drawtext.m b/src/libui_sdl/libui/darwin/drawtext.m deleted file mode 100644 index c376536..0000000 --- a/src/libui_sdl/libui/darwin/drawtext.m +++ /dev/null @@ -1,655 +0,0 @@ -// 6 september 2015 -#import "uipriv_darwin.h" - -// TODO -#define complain(...) implbug(__VA_ARGS__) - -// TODO double-check that we are properly handling allocation failures (or just toll free bridge from cocoa) -struct uiDrawFontFamilies { - CFArrayRef fonts; -}; - -uiDrawFontFamilies *uiDrawListFontFamilies(void) -{ - uiDrawFontFamilies *ff; - - ff = uiNew(uiDrawFontFamilies); - ff->fonts = CTFontManagerCopyAvailableFontFamilyNames(); - if (ff->fonts == NULL) - implbug("error getting available font names (no reason specified) (TODO)"); - return ff; -} - -int uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff) -{ - return CFArrayGetCount(ff->fonts); -} - -char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, int n) -{ - CFStringRef familystr; - char *family; - - familystr = (CFStringRef) CFArrayGetValueAtIndex(ff->fonts, n); - // toll-free bridge - family = uiDarwinNSStringToText((NSString *) familystr); - // Get Rule means we do not free familystr - return family; -} - -void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff) -{ - CFRelease(ff->fonts); - uiFree(ff); -} - -struct uiDrawTextFont { - CTFontRef f; -}; - -uiDrawTextFont *mkTextFont(CTFontRef f, BOOL retain) -{ - uiDrawTextFont *font; - - font = uiNew(uiDrawTextFont); - font->f = f; - if (retain) - CFRetain(font->f); - return font; -} - -uiDrawTextFont *mkTextFontFromNSFont(NSFont *f) -{ - // toll-free bridging; we do retain, though - return mkTextFont((CTFontRef) f, YES); -} - -static CFMutableDictionaryRef newAttrList(void) -{ - CFMutableDictionaryRef attr; - - attr = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); - if (attr == NULL) - complain("error creating attribute dictionary in newAttrList()()"); - return attr; -} - -static void addFontFamilyAttr(CFMutableDictionaryRef attr, const char *family) -{ - CFStringRef cfstr; - - cfstr = CFStringCreateWithCString(NULL, family, kCFStringEncodingUTF8); - if (cfstr == NULL) - complain("error creating font family name CFStringRef in addFontFamilyAttr()"); - CFDictionaryAddValue(attr, kCTFontFamilyNameAttribute, cfstr); - CFRelease(cfstr); // dictionary holds its own reference -} - -static void addFontSizeAttr(CFMutableDictionaryRef attr, double size) -{ - CFNumberRef n; - - n = CFNumberCreate(NULL, kCFNumberDoubleType, &size); - CFDictionaryAddValue(attr, kCTFontSizeAttribute, n); - CFRelease(n); -} - -#if 0 -TODO -// See http://stackoverflow.com/questions/4810409/does-coretext-support-small-caps/4811371#4811371 and https://git.gnome.org/browse/pango/tree/pango/pangocoretext-fontmap.c for what these do -// And fortunately, unlike the traits (see below), unmatched features are simply ignored without affecting the other features :D -static void addFontSmallCapsAttr(CFMutableDictionaryRef attr) -{ - CFMutableArrayRef outerArray; - CFMutableDictionaryRef innerDict; - CFNumberRef numType, numSelector; - int num; - - outerArray = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks); - if (outerArray == NULL) - complain("error creating outer CFArray for adding small caps attributes in addFontSmallCapsAttr()"); - - // Apple's headers say these are deprecated, but a few fonts still rely on them - num = kLetterCaseType; - numType = CFNumberCreate(NULL, kCFNumberIntType, &num); - num = kSmallCapsSelector; - numSelector = CFNumberCreate(NULL, kCFNumberIntType, &num); - innerDict = newAttrList(); - CFDictionaryAddValue(innerDict, kCTFontFeatureTypeIdentifierKey, numType); - CFRelease(numType); - CFDictionaryAddValue(innerDict, kCTFontFeatureSelectorIdentifierKey, numSelector); - CFRelease(numSelector); - CFArrayAppendValue(outerArray, innerDict); - CFRelease(innerDict); // and likewise for CFArray - - // these are the non-deprecated versions of the above; some fonts have these instead - num = kLowerCaseType; - numType = CFNumberCreate(NULL, kCFNumberIntType, &num); - num = kLowerCaseSmallCapsSelector; - numSelector = CFNumberCreate(NULL, kCFNumberIntType, &num); - innerDict = newAttrList(); - CFDictionaryAddValue(innerDict, kCTFontFeatureTypeIdentifierKey, numType); - CFRelease(numType); - CFDictionaryAddValue(innerDict, kCTFontFeatureSelectorIdentifierKey, numSelector); - CFRelease(numSelector); - CFArrayAppendValue(outerArray, innerDict); - CFRelease(innerDict); // and likewise for CFArray - - CFDictionaryAddValue(attr, kCTFontFeatureSettingsAttribute, outerArray); - CFRelease(outerArray); -} -#endif - -// Named constants for these were NOT added until 10.11, and even then they were added as external symbols instead of macros, so we can't use them directly :( -// kode54 got these for me before I had access to El Capitan; thanks to him. -#define ourNSFontWeightUltraLight -0.800000 -#define ourNSFontWeightThin -0.600000 -#define ourNSFontWeightLight -0.400000 -#define ourNSFontWeightRegular 0.000000 -#define ourNSFontWeightMedium 0.230000 -#define ourNSFontWeightSemibold 0.300000 -#define ourNSFontWeightBold 0.400000 -#define ourNSFontWeightHeavy 0.560000 -#define ourNSFontWeightBlack 0.620000 -static const CGFloat ctWeights[] = { - // yeah these two have their names swapped; blame Pango - [uiDrawTextWeightThin] = ourNSFontWeightUltraLight, - [uiDrawTextWeightUltraLight] = ourNSFontWeightThin, - [uiDrawTextWeightLight] = ourNSFontWeightLight, - // for this one let's go between Light and Regular - // we're doing nearest so if there happens to be an exact value hopefully it's close enough - [uiDrawTextWeightBook] = ourNSFontWeightLight + ((ourNSFontWeightRegular - ourNSFontWeightLight) / 2), - [uiDrawTextWeightNormal] = ourNSFontWeightRegular, - [uiDrawTextWeightMedium] = ourNSFontWeightMedium, - [uiDrawTextWeightSemiBold] = ourNSFontWeightSemibold, - [uiDrawTextWeightBold] = ourNSFontWeightBold, - // for this one let's go between Bold and Heavy - [uiDrawTextWeightUltraBold] = ourNSFontWeightBold + ((ourNSFontWeightHeavy - ourNSFontWeightBold) / 2), - [uiDrawTextWeightHeavy] = ourNSFontWeightHeavy, - [uiDrawTextWeightUltraHeavy] = ourNSFontWeightBlack, -}; - -// Unfortunately there are still no named constants for these. -// Let's just use normalized widths. -// As far as I can tell (OS X only ships with condensed fonts, not expanded fonts; TODO), regardless of condensed or expanded, negative means condensed and positive means expanded. -// TODO verify this is correct -static const CGFloat ctStretches[] = { - [uiDrawTextStretchUltraCondensed] = -1.0, - [uiDrawTextStretchExtraCondensed] = -0.75, - [uiDrawTextStretchCondensed] = -0.5, - [uiDrawTextStretchSemiCondensed] = -0.25, - [uiDrawTextStretchNormal] = 0.0, - [uiDrawTextStretchSemiExpanded] = 0.25, - [uiDrawTextStretchExpanded] = 0.5, - [uiDrawTextStretchExtraExpanded] = 0.75, - [uiDrawTextStretchUltraExpanded] = 1.0, -}; - -struct closeness { - CFIndex index; - CGFloat weight; - CGFloat italic; - CGFloat stretch; - CGFloat distance; -}; - -// Stupidity: CTFont requires an **exact match for the entire traits dictionary**, otherwise it will **drop ALL the traits**. -// We have to implement the closest match ourselves. -// Also we have to do this before adding the small caps flags, because the matching descriptors won't have those. -CTFontDescriptorRef matchTraits(CTFontDescriptorRef against, uiDrawTextWeight weight, uiDrawTextItalic italic, uiDrawTextStretch stretch) -{ - CGFloat targetWeight; - CGFloat italicCloseness, obliqueCloseness, normalCloseness; - CGFloat targetStretch; - CFArrayRef matching; - CFIndex i, n; - struct closeness *closeness; - CTFontDescriptorRef current; - CTFontDescriptorRef out; - - targetWeight = ctWeights[weight]; - switch (italic) { - case uiDrawTextItalicNormal: - italicCloseness = 1; - obliqueCloseness = 1; - normalCloseness = 0; - break; - case uiDrawTextItalicOblique: - italicCloseness = 0.5; - obliqueCloseness = 0; - normalCloseness = 1; - break; - case uiDrawTextItalicItalic: - italicCloseness = 0; - obliqueCloseness = 0.5; - normalCloseness = 1; - break; - } - targetStretch = ctStretches[stretch]; - - matching = CTFontDescriptorCreateMatchingFontDescriptors(against, NULL); - if (matching == NULL) - // no matches; give the original back and hope for the best - return against; - n = CFArrayGetCount(matching); - if (n == 0) { - // likewise - CFRelease(matching); - return against; - } - - closeness = (struct closeness *) uiAlloc(n * sizeof (struct closeness), "struct closeness[]"); - for (i = 0; i < n; i++) { - CFDictionaryRef traits; - CFNumberRef cfnum; - CTFontSymbolicTraits symbolic; - - closeness[i].index = i; - - current = CFArrayGetValueAtIndex(matching, i); - traits = CTFontDescriptorCopyAttribute(current, kCTFontTraitsAttribute); - if (traits == NULL) { - // couldn't get traits; be safe by ranking it lowest - // LONGTERM figure out what the longest possible distances are - closeness[i].weight = 3; - closeness[i].italic = 2; - closeness[i].stretch = 3; - continue; - } - - symbolic = 0; // assume no symbolic traits if none are listed - cfnum = CFDictionaryGetValue(traits, kCTFontSymbolicTrait); - if (cfnum != NULL) { - SInt32 s; - - if (CFNumberGetValue(cfnum, kCFNumberSInt32Type, &s) == false) - complain("error getting symbolic traits in matchTraits()"); - symbolic = (CTFontSymbolicTraits) s; - // Get rule; do not release cfnum - } - - // now try weight - cfnum = CFDictionaryGetValue(traits, kCTFontWeightTrait); - if (cfnum != NULL) { - CGFloat val; - - // LONGTERM instead of complaining for this and width and possibly also symbolic traits above, should we just fall through to the default? - if (CFNumberGetValue(cfnum, kCFNumberCGFloatType, &val) == false) - complain("error getting weight value in matchTraits()"); - closeness[i].weight = val - targetWeight; - } else - // okay there's no weight key; let's try the literal meaning of the symbolic constant - // LONGTERM is the weight key guaranteed? - if ((symbolic & kCTFontBoldTrait) != 0) - closeness[i].weight = ourNSFontWeightBold - targetWeight; - else - closeness[i].weight = ourNSFontWeightRegular - targetWeight; - - // italics is a bit harder because Core Text doesn't expose a concept of obliqueness - // Pango just does a g_strrstr() (backwards case-sensitive search) for "Oblique" in the font's style name (see https://git.gnome.org/browse/pango/tree/pango/pangocoretext-fontmap.c); let's do that too I guess - if ((symbolic & kCTFontItalicTrait) != 0) - closeness[i].italic = italicCloseness; - else { - CFStringRef styleName; - BOOL isOblique; - - isOblique = NO; // default value - styleName = CTFontDescriptorCopyAttribute(current, kCTFontStyleNameAttribute); - if (styleName != NULL) { - CFRange range; - - // note the use of the toll-free bridge for the string literal, since CFSTR() *can* return NULL - range = CFStringFind(styleName, (CFStringRef) @"Oblique", kCFCompareBackwards); - if (range.location != kCFNotFound) - isOblique = YES; - CFRelease(styleName); - } - if (isOblique) - closeness[i].italic = obliqueCloseness; - else - closeness[i].italic = normalCloseness; - } - - // now try width - // TODO this does not seem to be enough for Skia's extended variants; the width trait is 0 but the Expanded flag is on - // TODO verify the rest of this matrix (what matrix?) - cfnum = CFDictionaryGetValue(traits, kCTFontWidthTrait); - if (cfnum != NULL) { - CGFloat val; - - if (CFNumberGetValue(cfnum, kCFNumberCGFloatType, &val) == false) - complain("error getting width value in matchTraits()"); - closeness[i].stretch = val - targetStretch; - } else - // okay there's no width key; let's try the literal meaning of the symbolic constant - // LONGTERM is the width key guaranteed? - if ((symbolic & kCTFontExpandedTrait) != 0) - closeness[i].stretch = 1.0 - targetStretch; - else if ((symbolic & kCTFontCondensedTrait) != 0) - closeness[i].stretch = -1.0 - targetStretch; - else - closeness[i].stretch = 0.0 - targetStretch; - - CFRelease(traits); - } - - // now figure out the 3-space difference between the three and sort by that - for (i = 0; i < n; i++) { - CGFloat weight, italic, stretch; - - weight = closeness[i].weight; - weight *= weight; - italic = closeness[i].italic; - italic *= italic; - stretch = closeness[i].stretch; - stretch *= stretch; - closeness[i].distance = sqrt(weight + italic + stretch); - } - qsort_b(closeness, n, sizeof (struct closeness), ^(const void *aa, const void *bb) { - const struct closeness *a = (const struct closeness *) aa; - const struct closeness *b = (const struct closeness *) bb; - - // via http://www.gnu.org/software/libc/manual/html_node/Comparison-Functions.html#Comparison-Functions - // LONGTERM is this really the best way? isn't it the same as if (*a < *b) return -1; if (*a > *b) return 1; return 0; ? - return (a->distance > b->distance) - (a->distance < b->distance); - }); - // and the first element of the sorted array is what we want - out = CFArrayGetValueAtIndex(matching, closeness[0].index); - CFRetain(out); // get rule - - // release everything - uiFree(closeness); - CFRelease(matching); - // and release the original descriptor since we no longer need it - CFRelease(against); - - return out; -} - -// Now remember what I said earlier about having to add the small caps traits after calling the above? This gets a dictionary back so we can do so. -CFMutableDictionaryRef extractAttributes(CTFontDescriptorRef desc) -{ - CFDictionaryRef dict; - CFMutableDictionaryRef mdict; - - dict = CTFontDescriptorCopyAttributes(desc); - // this might not be mutable, so make a mutable copy - mdict = CFDictionaryCreateMutableCopy(NULL, 0, dict); - CFRelease(dict); - return mdict; -} - -uiDrawTextFont *uiDrawLoadClosestFont(const uiDrawTextFontDescriptor *desc) -{ - CTFontRef f; - CFMutableDictionaryRef attr; - CTFontDescriptorRef cfdesc; - - attr = newAttrList(); - addFontFamilyAttr(attr, desc->Family); - addFontSizeAttr(attr, desc->Size); - - // now we have to do the traits matching, so create a descriptor, match the traits, and then get the attributes back - cfdesc = CTFontDescriptorCreateWithAttributes(attr); - // TODO release attr? - cfdesc = matchTraits(cfdesc, desc->Weight, desc->Italic, desc->Stretch); - - // specify the initial size again just to be safe - f = CTFontCreateWithFontDescriptor(cfdesc, desc->Size, NULL); - // TODO release cfdesc? - - return mkTextFont(f, NO); // we hold the initial reference; no need to retain again -} - -void uiDrawFreeTextFont(uiDrawTextFont *font) -{ - CFRelease(font->f); - uiFree(font); -} - -uintptr_t uiDrawTextFontHandle(uiDrawTextFont *font) -{ - return (uintptr_t) (font->f); -} - -void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc) -{ - // TODO -} - -// text sizes and user space points are identical: -// - https://developer.apple.com/library/mac/documentation/TextFonts/Conceptual/CocoaTextArchitecture/TypoFeatures/TextSystemFeatures.html#//apple_ref/doc/uid/TP40009459-CH6-51627-BBCCHIFF text points are 72 per inch -// - https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CocoaDrawingGuide/Transforms/Transforms.html#//apple_ref/doc/uid/TP40003290-CH204-SW5 user space points are 72 per inch -void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics) -{ - metrics->Ascent = CTFontGetAscent(font->f); - metrics->Descent = CTFontGetDescent(font->f); - metrics->Leading = CTFontGetLeading(font->f); - metrics->UnderlinePos = CTFontGetUnderlinePosition(font->f); - metrics->UnderlineThickness = CTFontGetUnderlineThickness(font->f); -} - -struct uiDrawTextLayout { - CFMutableAttributedStringRef mas; - CFRange *charsToRanges; - double width; -}; - -uiDrawTextLayout *uiDrawNewTextLayout(const char *str, uiDrawTextFont *defaultFont, double width) -{ - uiDrawTextLayout *layout; - CFAttributedStringRef immutable; - CFMutableDictionaryRef attr; - CFStringRef backing; - CFIndex i, j, n; - - layout = uiNew(uiDrawTextLayout); - - // TODO docs say we need to use a different set of key callbacks - // TODO see if the font attribute key callbacks need to be the same - attr = newAttrList(); - // this will retain defaultFont->f; no need to worry - CFDictionaryAddValue(attr, kCTFontAttributeName, defaultFont->f); - - immutable = CFAttributedStringCreate(NULL, (CFStringRef) [NSString stringWithUTF8String:str], attr); - if (immutable == NULL) - complain("error creating immutable attributed string in uiDrawNewTextLayout()"); - CFRelease(attr); - - layout->mas = CFAttributedStringCreateMutableCopy(NULL, 0, immutable); - if (layout->mas == NULL) - complain("error creating attributed string in uiDrawNewTextLayout()"); - CFRelease(immutable); - - uiDrawTextLayoutSetWidth(layout, width); - - // unfortunately the CFRanges for attributes expect UTF-16 codepoints - // we want graphemes - // fortunately CFStringGetRangeOfComposedCharactersAtIndex() is here for us - // https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Strings/Articles/stringsClusters.html says that this does work on all multi-codepoint graphemes (despite the name), and that this is the preferred function for this particular job anyway - 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; - - return layout; -} - -void uiDrawFreeTextLayout(uiDrawTextLayout *layout) -{ - uiFree(layout->charsToRanges); - CFRelease(layout->mas); - uiFree(layout); -} - -void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width) -{ - layout->width = width; -} - -struct framesetter { - CTFramesetterRef fs; - CFMutableDictionaryRef frameAttrib; - CGSize extents; -}; - -// TODO CTFrameProgression for RTL/LTR -// TODO kCTParagraphStyleSpecifierMaximumLineSpacing, kCTParagraphStyleSpecifierMinimumLineSpacing, kCTParagraphStyleSpecifierLineSpacingAdjustment for line spacing -static void mkFramesetter(uiDrawTextLayout *layout, struct framesetter *fs) -{ - CFRange fitRange; - CGFloat width; - - fs->fs = CTFramesetterCreateWithAttributedString(layout->mas); - if (fs->fs == NULL) - complain("error creating CTFramesetter object in mkFramesetter()"); - - // TODO kCTFramePathWidthAttributeName? - fs->frameAttrib = NULL; - - width = layout->width; - if (layout->width < 0) - width = CGFLOAT_MAX; - // TODO these seem to be floor()'d or truncated? - fs->extents = CTFramesetterSuggestFrameSizeWithConstraints(fs->fs, - CFRangeMake(0, 0), - fs->frameAttrib, - CGSizeMake(width, CGFLOAT_MAX), - &fitRange); // not documented as accepting NULL -} - -static void freeFramesetter(struct framesetter *fs) -{ - if (fs->frameAttrib != NULL) - CFRelease(fs->frameAttrib); - CFRelease(fs->fs); -} - -// LONGTERM allow line separation and leading to be factored into a wrapping text layout - -// TODO reconcile differences in character wrapping on platforms -void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height) -{ - struct framesetter fs; - - mkFramesetter(layout, &fs); - *width = fs.extents.width; - *height = fs.extents.height; - freeFramesetter(&fs); -} - -// Core Text doesn't draw onto a flipped view correctly; we have to do this -// see the iOS bits of the first example at https://developer.apple.com/library/mac/documentation/StringsTextFonts/Conceptual/CoreText_Programming/LayoutOperations/LayoutOperations.html#//apple_ref/doc/uid/TP40005533-CH12-SW1 (iOS is naturally flipped) -// TODO how is this affected by the CTM? -static void prepareContextForText(CGContextRef c, CGFloat cheight, double *y) -{ - CGContextSaveGState(c); - CGContextTranslateCTM(c, 0, cheight); - CGContextScaleCTM(c, 1.0, -1.0); - CGContextSetTextMatrix(c, CGAffineTransformIdentity); - - // wait, that's not enough; we need to offset y values to account for our new flipping - *y = cheight - *y; -} - -// TODO placement is incorrect for Helvetica -void doDrawText(CGContextRef c, CGFloat cheight, double x, double y, uiDrawTextLayout *layout) -{ - struct framesetter fs; - CGRect rect; - CGPathRef path; - CTFrameRef frame; - - prepareContextForText(c, cheight, &y); - mkFramesetter(layout, &fs); - - // oh, and since we're flipped, y is the bottom-left coordinate of the rectangle, not the top-left - // since we are flipped, we subtract - y -= fs.extents.height; - - rect.origin = CGPointMake(x, y); - rect.size = fs.extents; - path = CGPathCreateWithRect(rect, NULL); - - frame = CTFramesetterCreateFrame(fs.fs, - CFRangeMake(0, 0), - path, - fs.frameAttrib); - if (frame == NULL) - complain("error creating CTFrame object in doDrawText()"); - CTFrameDraw(frame, c); - CFRelease(frame); - - CFRelease(path); - - freeFramesetter(&fs); - CGContextRestoreGState(c); -} - -// LONGTERM provide an equivalent to CTLineGetTypographicBounds() on uiDrawTextLayout? - -// LONGTERM keep this for later features and documentation purposes -#if 0 - w = CTLineGetTypographicBounds(line, &ascent, &descent, NULL); - // though CTLineGetTypographicBounds() returns 0 on error, it also returns 0 on an empty string, so we can't reasonably check for error - CFRelease(line); - - // LONGTERM provide a way to get the image bounds as a separate function later - bounds = CTLineGetImageBounds(line, c); - // though CTLineGetImageBounds() returns CGRectNull on error, it also returns CGRectNull on an empty string, so we can't reasonably check for error - - // CGContextSetTextPosition() positions at the baseline in the case of CTLineDraw(); we need the top-left corner instead - CTLineGetTypographicBounds(line, &yoff, NULL, NULL); - // remember that we're flipped, so we subtract - y -= yoff; - CGContextSetTextPosition(c, x, y); -#endif - -static CFRange charsToRange(uiDrawTextLayout *layout, int startChar, int endChar) -{ - CFRange start, end; - CFRange out; - - start = layout->charsToRanges[startChar]; - end = layout->charsToRanges[endChar]; - out.location = start.location; - out.length = end.location - start.location; - return out; -} - -#define rangeToCFRange() charsToRange(layout, startChar, endChar) - -void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, int startChar, int endChar, double r, double g, double b, double a) -{ - CGColorSpaceRef colorspace; - CGFloat components[4]; - CGColorRef color; - - // for consistency with windows, use sRGB - colorspace = CGColorSpaceCreateWithName(kCGColorSpaceSRGB); - components[0] = r; - components[1] = g; - components[2] = b; - components[3] = a; - color = CGColorCreate(colorspace, components); - CGColorSpaceRelease(colorspace); - - CFAttributedStringSetAttribute(layout->mas, - rangeToCFRange(), - kCTForegroundColorAttributeName, - color); - CGColorRelease(color); // TODO safe? -} |