reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /*
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| 2 | ** Copyright 2006, The Android Open Source Project |
| 3 | **
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| 4 | ** Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | ** you may not use this file except in compliance with the License.
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| 6 | ** You may obtain a copy of the License at
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| 7 | **
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| 8 | ** http://www.apache.org/licenses/LICENSE-2.0
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| 9 | **
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| 10 | ** Unless required by applicable law or agreed to in writing, software
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| 11 | ** distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | ** See the License for the specific language governing permissions and
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| 14 | ** limitations under the License.
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| 15 | */
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| 16 |
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| 17 | #include "SkFontHost.h"
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| 18 | #include "SkDescriptor.h"
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| 19 |
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| 20 | // Give 1MB font cache budget
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| 21 | #define FONT_CACHE_MEMORY_BUDGET (1024 * 1024)
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| 22 |
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| 23 | const char* gDefaultfont = "Arial"; // hard code for now
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| 24 | static SkMutex gFTMutex;
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| 25 |
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| 26 | inline SkPoint F32PtToSkPoint(const Float32Point p)
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| 27 | {
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| 28 | SkPoint sp = { SkFloatToFixed(p.x),SkFloatToFixed(p.y) };
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| 29 | return sp;
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| 30 | }
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| 31 |
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| 32 | static inline uint32_t _rotl(uint32_t v, uint32_t r)
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| 33 | {
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| 34 | return (v << r | v >> (32 - r));
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| 35 | }
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| 36 |
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| 37 | // This will generate a unique ID based on the fontname + fontstyle
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| 38 | // and also used by upper layer
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| 39 | uint32_t FontFaceChecksum(const char *name,SkTypeface::Style style)
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| 40 | {
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| 41 | if (!name) return style;
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| 42 |
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| 43 | char* q = (char*)name;
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| 44 |
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| 45 | // From "Performance in Practice of String Hashing Functions"
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| 46 | // Ramakrishna & Zobel
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| 47 | const uint32_t L = 5;
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| 48 | const uint32_t R = 2;
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| 49 |
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| 50 | uint32_t h = 0x12345678;
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| 51 | while (*q) {
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| 52 | uint32_t ql = tolower(*q);
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| 53 | h ^= ((h << L) + (h >> R) + ql);
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| 54 | q ++;
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| 55 | }
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| 56 |
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| 57 | // add style
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| 58 | h = _rotl(h, 3) ^ style;
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| 59 |
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| 60 | return h;
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| 61 | }
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| 62 |
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| 63 | #pragma mark -
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| 64 | struct SkFaceRec {
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| 65 | SkFaceRec* fNext;
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| 66 | uint32_t fRefCnt;
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| 67 | ATSUFontID fFontID;
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| 68 | ATSUStyle fStyle;
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| 69 |
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| 70 | SkFaceRec() : fFontID(0), fRefCnt(0), fStyle(NULL) {};
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| 71 |
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| 72 | ~SkFaceRec() {
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| 73 | if (fStyle) {
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| 74 | ::ATSUDisposeStyle(fStyle);
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| 75 | fStyle = NULL;
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | uint32_t ref() {
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| 80 | return ++fRefCnt;
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| 81 | }
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| 82 | };
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| 83 |
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| 84 | // Font Face list
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| 85 | static SkFaceRec* gFaceRecHead = NULL;
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| 86 |
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| 87 | static SkFaceRec* find_ft_face(const ATSUFontID fontID) {
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| 88 | SkFaceRec* rec = gFaceRecHead;
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| 89 | while (rec) {
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| 90 | if (rec->fFontID == fontID) {
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| 91 | return rec;
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| 92 | }
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| 93 | rec = rec->fNext;
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| 94 | }
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| 95 |
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| 96 | return NULL;
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| 97 | }
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| 98 |
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| 99 | static SkFaceRec* insert_ft_face(const ATSUFontID afontID, const ATSUStyle atsuStyle) {
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| 100 | SkFaceRec* rec = find_ft_face(afontID);
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| 101 | if (rec) {
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| 102 | return rec; // found?
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| 103 | }
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| 104 |
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| 105 | rec = SkNEW(SkFaceRec);
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| 106 | rec->fFontID = afontID;
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| 107 | rec->fStyle = atsuStyle;
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| 108 | rec->fNext = gFaceRecHead;
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| 109 | gFaceRecHead = rec;
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| 110 |
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| 111 | return rec;
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| 112 | }
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| 113 |
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| 114 | static void unref_ft_face(const ATSUFontID fontID) {
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| 115 |
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| 116 | SkFaceRec* rec = gFaceRecHead;
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| 117 | SkFaceRec* prev = NULL;
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| 118 | while (rec) {
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| 119 | SkFaceRec* next = rec->fNext;
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| 120 | if (rec->fFontID == fontID) {
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| 121 | if (--rec->fRefCnt == 0) {
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| 122 | if (prev)
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| 123 | prev->fNext = next;
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| 124 | else
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| 125 | gFaceRecHead = next;
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| 126 |
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| 127 | SkDELETE(rec);
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| 128 | }
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| 129 | return;
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| 130 | }
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| 131 | prev = rec;
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| 132 | rec = next;
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| 133 | }
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| 134 | SkASSERT("shouldn't get here, face not in list");
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| 135 | }
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| 136 |
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| 137 | #pragma mark -
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| 138 |
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| 139 | // have to do this because SkTypeface::SkTypeface() is protected
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| 140 | class SkTypeface_Mac : public SkTypeface {
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| 141 | public:
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| 142 | SkTypeface_Mac(SkTypeface::Style style, uint32_t id) : SkTypeface(style, id) {}
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| 143 |
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| 144 | ~SkTypeface_Mac() {}
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| 145 | };
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| 146 |
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| 147 | #pragma mark -
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| 148 |
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| 149 | static SkTypeface* CreateTypeface_(const char *name, const SkTypeface::Style style) {
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| 150 |
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| 151 | OSStatus err;
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| 152 | ATSUStyle atsuStyle;
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| 153 | ::ATSUCreateStyle(&atsuStyle);
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| 154 | if (name != NULL) {
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| 155 | static const ATSUAttributeTag fontTag = kATSUFontTag;
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| 156 | static const ByteCount fontTagSize = sizeof(ATSUFontID);
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| 157 |
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| 158 | ATSUFontID fontID = 0;
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| 159 | #if 1
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| 160 | err = ::ATSUFindFontFromName(
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| 161 | name,strlen(name),kFontNoNameCode, /* instead of regular, kFontFamilyName returns bold and/or italic sometimes, but why this works?? */
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| 162 | kFontMacintoshPlatform,kFontNoScriptCode,kFontNoLanguageCode,&fontID);
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| 163 | #else
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| 164 | CFStringRef cfontName = CFStringCreateWithCString(NULL, name, kCFStringEncodingASCII);
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| 165 | ATSFontRef fontRef = ::ATSFontFindFromName(cfontName,kATSOptionFlagsDefault);
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| 166 | fontID = ::FMGetFontFromATSFontRef(fontRef);
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| 167 | CFRelease(cfontName);
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| 168 | #endif
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| 169 | if (0 != fontID) {
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| 170 | const ATSUAttributeValuePtr values[] = { &fontID };
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| 171 | err = ::ATSUSetAttributes(atsuStyle,1,&fontTag,&fontTagSize,values);
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| 172 | }
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| 173 | else {
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| 174 | }
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| 175 | }
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| 176 | if (style != SkTypeface::kNormal) {
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| 177 | Boolean fontItalic = ((style & SkTypeface::kItalic) != 0);
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| 178 | Boolean fontBold = ((style & SkTypeface::kBold) != 0);
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| 179 | const ATSUAttributeTag tags[2] = { kATSUQDBoldfaceTag, kATSUQDItalicTag };
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| 180 | const ATSUAttributeValuePtr values[2] = { &fontBold, &fontItalic };
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| 181 | const ByteCount sizes[2] = { sizeof(Boolean), sizeof(Boolean) };
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| 182 | err = ::ATSUSetAttributes(atsuStyle,2,tags,sizes,values);
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| 183 | }
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| 184 |
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| 185 | uint32_t cs = FontFaceChecksum(name,style);
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| 186 | SkTypeface_Mac* ptypeface = new SkTypeface_Mac(style,cs);
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| 187 |
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| 188 | if (NULL == ptypeface) {
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| 189 | SkASSERT(false);
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| 190 | return NULL;
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| 191 | }
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| 192 |
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| 193 | SkFaceRec* rec = insert_ft_face(cs, atsuStyle);
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| 194 | SkASSERT(rec);
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| 195 |
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| 196 | return ptypeface;
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| 197 | }
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| 198 |
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| 199 | static SkTypeface* CreateTypeface_(const SkFaceRec* rec, const SkTypeface::Style style) {
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| 200 |
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| 201 | OSStatus err;
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| 202 | ATSUStyle atsuStyle;
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| 203 | err = ::ATSUCreateAndCopyStyle(rec->fStyle, &atsuStyle);
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| 204 |
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| 205 | Boolean fontItalic = ((style & SkTypeface::kItalic) != 0);
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| 206 | Boolean fontBold = ((style & SkTypeface::kBold) != 0);
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| 207 | const ATSUAttributeTag tags[2] = { kATSUQDBoldfaceTag, kATSUQDItalicTag };
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| 208 | const ATSUAttributeValuePtr values[2] = { &fontBold, &fontItalic };
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| 209 | const ByteCount sizes[2] = { sizeof(Boolean), sizeof(Boolean) };
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| 210 | err = ::ATSUSetAttributes(atsuStyle,2,tags,sizes,values);
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| 211 |
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| 212 | // get old font id and name
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| 213 | ATSUFontID fontID = 0;
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| 214 | ByteCount actual = 0;
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| 215 | err = ::ATSUGetAttribute(rec->fStyle,kATSUFontTag,sizeof(ATSUFontID),&fontID,&actual);
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| 216 |
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| 217 | ByteCount actualLength = 0;
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| 218 | char *fontname = NULL;
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| 219 | err = ::ATSUFindFontName(fontID , kFontFamilyName, kFontUnicodePlatform, kFontNoScriptCode,
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| 220 | kFontNoLanguageCode , 0 , NULL , &actualLength , NULL );
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| 221 | if ( err == noErr)
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| 222 | {
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| 223 | actualLength += 1 ;
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| 224 | fontname = (char*)malloc( actualLength );
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| 225 | err = ::ATSUFindFontName(fontID, kFontFamilyName, kFontUnicodePlatform, kFontNoScriptCode,
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| 226 | kFontNoLanguageCode, actualLength, fontname , NULL, NULL);
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| 227 | }
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| 228 |
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| 229 | SkTypeface_Mac* ptypeface = NULL;
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| 230 | if (fontname == NULL) {
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| 231 | ptypeface = new SkTypeface_Mac(style,rec->fFontID);
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| 232 | return ptypeface;
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| 233 | }
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| 234 | else {
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| 235 | uint32_t cs = FontFaceChecksum(fontname,style);
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| 236 | ptypeface = new SkTypeface_Mac(style, cs);
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| 237 |
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| 238 | if (NULL == ptypeface) {
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| 239 | SkASSERT(false);
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| 240 | return NULL;
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| 241 | }
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| 242 |
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| 243 | free(fontname);
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| 244 |
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| 245 | insert_ft_face(cs,atsuStyle);
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| 246 | }
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| 247 | return ptypeface;
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| 248 | }
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| 249 |
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| 250 | #pragma mark -
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| 251 |
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| 252 | class SkScalerContext_Mac : public SkScalerContext {
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| 253 | public:
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| 254 | SkScalerContext_Mac(const SkDescriptor* desc);
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| 255 | virtual ~SkScalerContext_Mac();
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| 256 |
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| 257 | protected:
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| 258 | virtual unsigned generateGlyphCount() const;
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| 259 | virtual uint16_t generateCharToGlyph(SkUnichar uni);
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| 260 | virtual void generateAdvance(SkGlyph* glyph);
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| 261 | virtual void generateMetrics(SkGlyph* glyph);
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| 262 | virtual void generateImage(const SkGlyph& glyph);
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| 263 | virtual void generatePath(const SkGlyph& glyph, SkPath* path);
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| 264 | virtual void generateLineHeight(SkPoint* ascent, SkPoint* descent);
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| 265 | virtual void generateFontMetrics(SkPaint::FontMetrics* mX, SkPaint::FontMetrics* mY);
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| 266 | virtual SkDeviceContext getDC() { return NULL; } // not implemented on Mac
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| 267 |
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| 268 | private:
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| 269 | ATSUTextLayout fLayout;
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| 270 | ATSUStyle fStyle;
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| 271 |
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| 272 | static OSStatus MoveTo(const Float32Point *pt, void *cb);
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| 273 | static OSStatus Line(const Float32Point *pt, void *cb);
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| 274 | static OSStatus Curve(const Float32Point *pt1, const Float32Point *pt2, const Float32Point *pt3, void *cb);
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| 275 | static OSStatus Close(void *cb);
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| 276 | };
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| 277 |
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| 278 | SkScalerContext_Mac::SkScalerContext_Mac(const SkDescriptor* desc)
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| 279 | : SkScalerContext(desc), fLayout(0), fStyle(0)
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| 280 | {
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| 281 | SkAutoMutexAcquire ac(gFTMutex);
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| 282 | OSStatus err;
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| 283 |
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| 284 | SkFaceRec* rec = find_ft_face(fRec.fFontID);
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| 285 | if (rec) {
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| 286 | rec->ref();
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| 287 | err = ::ATSUCreateAndCopyStyle(rec->fStyle, &fStyle);
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| 288 | }
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| 289 | else {
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| 290 | SkASSERT(false);
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| 291 | // create a default
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| 292 | err = ::ATSUCreateStyle(&fStyle);
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| 293 | }
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| 294 |
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| 295 | uint32_t size = SkFixedFloor(fRec.fTextSize);
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| 296 | Fixed fixedSize = IntToFixed(size);
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| 297 | static const ATSUAttributeTag sizeTag = kATSUSizeTag;
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| 298 | static const ByteCount sizeTagSize = sizeof(Fixed);
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| 299 | const ATSUAttributeValuePtr values[] = { &fixedSize };
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| 300 | err = ::ATSUSetAttributes(fStyle,1,&sizeTag,&sizeTagSize,values);
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| 301 |
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| 302 | err = ::ATSUCreateTextLayout(&fLayout);
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| 303 | }
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| 304 |
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| 305 | SkScalerContext_Mac::~SkScalerContext_Mac()
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| 306 | {
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| 307 | unref_ft_face(fRec.fFontID);
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| 308 |
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| 309 | ::ATSUDisposeTextLayout(fLayout);
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| 310 | ::ATSUDisposeStyle(fStyle);
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| 311 | }
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| 312 |
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| 313 | unsigned SkScalerContext_Mac::generateGlyphCount() const
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| 314 | {
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| 315 | return 0xFFFF;
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| 316 | }
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| 317 |
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| 318 | uint16_t SkScalerContext_Mac::generateCharToGlyph(SkUnichar uni)
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| 319 | {
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| 320 | SkAutoMutexAcquire ac(gFTMutex);
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| 321 |
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| 322 | OSStatus err;
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| 323 | UniChar achar = uni;
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| 324 | err = ::ATSUSetTextPointerLocation(fLayout,&achar,0,1,1);
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| 325 | err = ::ATSUSetRunStyle(fLayout,fStyle,kATSUFromTextBeginning,kATSUToTextEnd);
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| 326 |
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| 327 | ATSLayoutRecord *layoutPtr;
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| 328 | ItemCount count;
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| 329 | ATSGlyphRef glyph;
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| 330 |
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| 331 | err = ::ATSUDirectGetLayoutDataArrayPtrFromTextLayout(fLayout,0,kATSUDirectDataLayoutRecordATSLayoutRecordCurrent,(void**)&layoutPtr,&count);
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| 332 | glyph = layoutPtr->glyphID;
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| 333 | ::ATSUDirectReleaseLayoutDataArrayPtr(NULL,kATSUDirectDataLayoutRecordATSLayoutRecordCurrent,(void**)&layoutPtr);
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| 334 | return glyph;
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| 335 | }
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| 336 |
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| 337 | void SkScalerContext_Mac::generateAdvance(SkGlyph* glyph) {
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| 338 | this->generateMetrics(glyph);
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| 339 | }
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| 340 |
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| 341 | void SkScalerContext_Mac::generateMetrics(SkGlyph* glyph)
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| 342 | {
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| 343 | GlyphID glyphID = glyph->fID;
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| 344 | ATSGlyphScreenMetrics metrics= { 0 };
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| 345 |
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| 346 | glyph->fRsbDelta = 0;
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| 347 | glyph->fLsbDelta = 0;
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| 348 |
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| 349 | OSStatus err = ATSUGlyphGetScreenMetrics(fStyle,1,&glyphID,0,true,true,&metrics);
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| 350 | if (err == noErr) {
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| 351 | glyph->fAdvanceX = SkFloatToFixed(metrics.deviceAdvance.x);
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| 352 | glyph->fAdvanceY = SkFloatToFixed(metrics.deviceAdvance.y);
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| 353 | //glyph->fWidth = metrics.width;
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| 354 | //glyph->fHeight = metrics.height;
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| 355 | glyph->fWidth = metrics.width + ceil(metrics.sideBearing.x - metrics.otherSideBearing.x);
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| 356 | glyph->fHeight = metrics.height + ceil(metrics.sideBearing.y - metrics.otherSideBearing.y) + 1;
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| 357 |
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| 358 | glyph->fTop = -metrics.topLeft.y;
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| 359 | glyph->fLeft = metrics.topLeft.x;
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| 360 | }
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| 361 | }
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| 362 |
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| 363 | void SkScalerContext_Mac::generateFontMetrics(SkPaint::FontMetrics* mx, SkPaint::FontMetrics* my) {
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| 364 | //SkASSERT(false);
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| 365 | if (mx)
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| 366 | memset(mx, 0, sizeof(SkPaint::FontMetrics));
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| 367 | if (my)
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| 368 | memset(my, 0, sizeof(SkPaint::FontMetrics));
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| 369 | return;
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| 370 | }
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| 371 |
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| 372 | void SkScalerContext_Mac::generateImage(const SkGlyph& glyph)
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| 373 | {
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| 374 | SkAutoMutexAcquire ac(gFTMutex);
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| 375 |
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| 376 | GlyphID glyphID = glyph.fID;
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| 377 | ATSGlyphScreenMetrics metrics= { 0 };
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| 378 |
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| 379 | SkASSERT(fLayout);
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| 380 | OSStatus err = ::ATSUGlyphGetScreenMetrics(fStyle,1,&glyphID,0,true,true,&metrics);
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| 381 |
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| 382 | // uint32_t w = metrics.width;
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| 383 | // uint32_t h = metrics.height;
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| 384 | // uint32_t pitch = (w + 3) & ~0x3;
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| 385 | // if (pitch != glyph.rowBytes()) {
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| 386 | // SkASSERT(false); // it's different from previously cacluated in generateMetrics(), so the size of glyph.fImage buffer is incorrect!
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| 387 | // }
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| 388 |
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| 389 | CGColorSpaceRef greyColorSpace = ::CGColorSpaceCreateWithName(kCGColorSpaceGenericGray);
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| 390 | CGContextRef contextRef = ::CGBitmapContextCreate((uint8_t*)glyph.fImage, glyph.fWidth, glyph.fHeight, 8, glyph.rowBytes(), greyColorSpace, kCGImageAlphaNone);
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| 391 | if (!contextRef) {
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| 392 | SkASSERT(false);
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| 393 | return;
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| 394 | }
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| 395 |
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| 396 | ::CGContextSetFillColorSpace(contextRef, greyColorSpace);
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| 397 | ::CGContextSetStrokeColorSpace(contextRef, greyColorSpace);
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| 398 |
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| 399 | ::CGContextSetGrayFillColor(contextRef, 0.0, 1.0);
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| 400 | ::CGContextFillRect(contextRef, ::CGRectMake(0, 0, glyph.fWidth, glyph.fHeight));
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| 401 |
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| 402 | ::CGContextSetGrayFillColor(contextRef, 1.0, 1.0);
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| 403 | ::CGContextSetGrayStrokeColor(contextRef, 1.0, 1.0);
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| 404 | ::CGContextSetTextDrawingMode(contextRef, kCGTextFill);
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| 405 |
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| 406 | ATSUAttributeTag tag = kATSUCGContextTag;
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| 407 | ByteCount size = sizeof(CGContextRef);
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| 408 | ATSUAttributeValuePtr value = &contextRef;
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| 409 | err = ::ATSUSetLayoutControls(fLayout,1,&tag,&size,&value);
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| 410 | err = ::ATSUDrawText(fLayout,kATSUFromTextBeginning,kATSUToTextEnd,FloatToFixed(-metrics.topLeft.x),FloatToFixed(glyph.fHeight-metrics.topLeft.y));
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| 411 | ::CGContextRelease(contextRef);
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| 412 | }
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| 413 |
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| 414 | void SkScalerContext_Mac::generatePath(const SkGlyph& glyph, SkPath* path)
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| 415 | {
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| 416 | SkAutoMutexAcquire ac(gFTMutex);
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| 417 | OSStatus err,result;
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| 418 |
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| 419 | err = ::ATSUGlyphGetCubicPaths(
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| 420 | fStyle,glyph.fID,
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| 421 | &SkScalerContext_Mac::MoveTo,
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| 422 | &SkScalerContext_Mac::Line,
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| 423 | &SkScalerContext_Mac::Curve,
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| 424 | &SkScalerContext_Mac::Close,
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| 425 | path,&result);
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| 426 | SkASSERT(err == noErr);
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| 427 | }
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| 428 |
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| 429 | void SkScalerContext_Mac::generateLineHeight(SkPoint* ascent, SkPoint* descent)
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| 430 | {
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| 431 | ATSUTextMeasurement textAscent, textDescent;
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| 432 | ByteCount actual = 0;
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| 433 | OSStatus err = ::ATSUGetAttribute(fStyle,kATSULineAscentTag,sizeof(ATSUTextMeasurement),&textAscent,&actual);
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| 434 | ascent->set(0,textAscent);
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| 435 | err = ::ATSUGetAttribute(fStyle,kATSULineDescentTag,sizeof(ATSUTextMeasurement),&textDescent,&actual);
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| 436 | descent->set(0,textDescent);
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| 437 | }
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| 438 |
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| 439 | OSStatus SkScalerContext_Mac::MoveTo(const Float32Point *pt, void *cb)
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| 440 | {
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| 441 | reinterpret_cast<SkPath*>(cb)->moveTo(F32PtToSkPoint(*pt));
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| 442 | return noErr;
|
| 443 | }
|
| 444 |
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| 445 | OSStatus SkScalerContext_Mac::Line(const Float32Point *pt, void *cb)
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| 446 | {
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| 447 | reinterpret_cast<SkPath*>(cb)->lineTo(F32PtToSkPoint(*pt));
|
| 448 | return noErr;
|
| 449 | }
|
| 450 |
|
| 451 | OSStatus SkScalerContext_Mac::Curve(const Float32Point *pt1, const Float32Point *pt2, const Float32Point *pt3, void *cb)
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| 452 | {
|
| 453 | reinterpret_cast<SkPath*>(cb)->cubicTo(F32PtToSkPoint(*pt1),F32PtToSkPoint(*pt2),F32PtToSkPoint(*pt3));
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| 454 | return noErr;
|
| 455 | }
|
| 456 |
|
| 457 | OSStatus SkScalerContext_Mac::Close(void *cb)
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| 458 | {
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| 459 | reinterpret_cast<SkPath*>(cb)->close();
|
| 460 | return noErr;
|
| 461 | }
|
| 462 |
|
| 463 | #pragma mark -
|
| 464 |
|
| 465 | void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
|
| 466 | SkASSERT(!"SkFontHost::Serialize unimplemented");
|
| 467 | }
|
| 468 |
|
| 469 | SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
|
| 470 | SkASSERT(!"SkFontHost::Deserialize unimplemented");
|
| 471 | return NULL;
|
| 472 | }
|
| 473 |
|
| 474 | SkTypeface* SkFontHost::CreateTypeface(SkStream* stream) {
|
| 475 |
|
| 476 | //Should not be used on Mac, keep linker happy
|
| 477 | SkASSERT(false);
|
| 478 | return CreateTypeface_(gDefaultfont,SkTypeface::kNormal);
|
| 479 | }
|
| 480 |
|
| 481 | SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc)
|
| 482 | {
|
| 483 | return new SkScalerContext_Mac(desc);
|
| 484 | }
|
| 485 |
|
| 486 | SkScalerContext* SkFontHost::CreateFallbackScalerContext(const SkScalerContext::Rec& rec)
|
| 487 | {
|
| 488 | SkAutoDescriptor ad(sizeof(rec) + sizeof(gDefaultfont) + SkDescriptor::ComputeOverhead(2));
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| 489 | SkDescriptor* desc = ad.getDesc();
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| 490 |
|
| 491 | desc->init();
|
| 492 | SkScalerContext::Rec* newRec =
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| 493 | (SkScalerContext::Rec*)desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec);
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| 494 |
|
| 495 | CreateTypeface_(gDefaultfont,SkTypeface::kNormal);
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| 496 | newRec->fFontID = FontFaceChecksum(gDefaultfont,SkTypeface::kNormal);
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| 497 | desc->computeChecksum();
|
| 498 |
|
| 499 | return SkFontHost::CreateScalerContext(desc);
|
| 500 | }
|
| 501 |
|
| 502 |
|
| 503 | /** Return the closest matching typeface given either an existing family
|
| 504 | (specified by a typeface in that family) or by a familyName, and a
|
| 505 | requested style.
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| 506 | 1) If familyFace is null, use famillyName.
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| 507 | 2) If famillyName is null, use familyFace.
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| 508 | 3) If both are null, return the default font that best matches style
|
| 509 | This MUST not return NULL.
|
| 510 | */
|
| 511 |
|
| 512 | SkTypeface* SkFontHost::FindTypeface(const SkTypeface* familyFace, const char familyName[], SkTypeface::Style style) {
|
| 513 |
|
| 514 | SkAutoMutexAcquire ac(gFTMutex);
|
| 515 |
|
| 516 | // clip to legal style bits
|
| 517 | style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);
|
| 518 |
|
| 519 | SkTypeface* tf = NULL;
|
| 520 |
|
| 521 | if (NULL == familyFace && NULL == familyName) {
|
| 522 | tf = CreateTypeface_(gDefaultfont,style);
|
| 523 | }
|
| 524 | else {
|
| 525 | if (NULL != familyFace) {
|
| 526 | uint32_t id = familyFace->uniqueID();
|
| 527 | SkFaceRec* rec = find_ft_face(id);
|
| 528 | if (!rec) {
|
| 529 | SkASSERT(false);
|
| 530 | tf = CreateTypeface_(gDefaultfont,style);
|
| 531 | }
|
| 532 | else {
|
| 533 | tf = CreateTypeface_(rec,style);
|
| 534 | }
|
| 535 | }
|
| 536 | else {
|
| 537 | tf = CreateTypeface_(familyName,style);
|
| 538 | }
|
| 539 | }
|
| 540 |
|
| 541 | if (NULL == tf) {
|
| 542 | tf = CreateTypeface_(gDefaultfont,style);
|
| 543 | }
|
| 544 | return tf;
|
| 545 |
|
| 546 | }
|
| 547 |
|
| 548 | size_t SkFontHost::ShouldPurgeFontCache(size_t sizeAllocatedSoFar) {
|
| 549 | if (sizeAllocatedSoFar > FONT_CACHE_MEMORY_BUDGET)
|
| 550 | return sizeAllocatedSoFar - FONT_CACHE_MEMORY_BUDGET;
|
| 551 | else
|
| 552 | return 0; // nothing to do
|
| 553 | }
|
| 554 |
|
| 555 | int SkFontHost::ComputeGammaFlag(const SkPaint& paint) {
|
| 556 | return 0;
|
| 557 | }
|
| 558 |
|
| 559 | void SkFontHost::GetGammaTables(const uint8_t* tables[2]) {
|
| 560 | tables[0] = NULL; // black gamma (e.g. exp=1.4)
|
| 561 | tables[1] = NULL; // white gamma (e.g. exp= 1/1.4)
|
| 562 | }
|
| 563 |
|