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
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| 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 "SkString.h"
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| 18 | //#include "SkStream.h"
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| 19 |
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| 20 | #include "SkFontHost.h"
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| 21 | #include "SkDescriptor.h"
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| 22 | #include "SkThread.h"
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| 23 |
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| 24 | #ifdef WIN32
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| 25 | #include "windows.h"
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| 26 | #include "tchar.h"
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| 27 |
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| 28 | // client3d has to undefine this for now
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| 29 | #define CAN_USE_LOGFONT_NAME
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| 30 |
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| 31 | static SkMutex gFTMutex;
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| 32 |
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| 33 | // these globals are loaded (once) by get_default_font()
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| 34 | static LOGFONT gDefaultFont = {0};
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| 35 |
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| 36 | static const uint16_t BUFFERSIZE = (16384 - 32);
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| 37 | static uint8_t glyphbuf[BUFFERSIZE];
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| 38 |
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| 39 | // Give 1MB font cache budget
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| 40 | #define FONT_CACHE_MEMORY_BUDGET (1024 * 1024)
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| 41 |
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| 42 | static inline FIXED SkFixedToFIXED(SkFixed x) {
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| 43 | return *(FIXED*)(&x);
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| 44 | }
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| 45 |
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| 46 | static inline FIXED SkScalarToFIXED(SkScalar x) {
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| 47 | return SkFixedToFIXED(SkScalarToFixed(x));
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| 48 | }
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| 49 |
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| 50 | // This will generate a unique ID based on the fontname + fontstyle
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| 51 | // and also used by upper layer
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| 52 | uint32_t FontFaceChecksum(const TCHAR *q, SkTypeface::Style style)
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| 53 | {
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| 54 | if (!q) return style;
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| 55 |
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| 56 | // From "Performance in Practice of String Hashing Functions"
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| 57 | // Ramakrishna & Zobel
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| 58 | const uint32_t L = 5;
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| 59 | const uint32_t R = 2;
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| 60 |
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| 61 | uint32_t h = 0x12345678;
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| 62 | while (*q) {
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| 63 | //uint32_t ql = tolower(*q);
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| 64 | h ^= ((h << L) + (h >> R) + *q);
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| 65 | q ++;
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| 66 | }
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| 67 |
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| 68 | // add style
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| 69 | h = _rotl(h, 3) ^ style;
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| 70 |
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| 71 | return h;
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| 72 | }
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| 73 |
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| 74 | static SkTypeface::Style GetFontStyle(const LOGFONT& lf) {
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| 75 | int style = SkTypeface::kNormal;
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| 76 | if (lf.lfWeight == FW_SEMIBOLD || lf.lfWeight == FW_DEMIBOLD || lf.lfWeight == FW_BOLD)
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| 77 | style |= SkTypeface::kBold;
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| 78 | if (lf.lfItalic)
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| 79 | style |= SkTypeface::kItalic;
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| 80 |
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| 81 | return (SkTypeface::Style)style;
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| 82 | }
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| 83 |
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| 84 | struct SkFaceRec {
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| 85 | SkFaceRec* fNext;
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| 86 | uint32_t fRefCnt;
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| 87 | uint32_t fFontID; // checksum of fFace
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| 88 | LOGFONT fFace;
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| 89 |
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| 90 | SkFaceRec() : fFontID(-1), fRefCnt(0) {
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| 91 | memset(&fFace, 0, sizeof(LOGFONT));
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| 92 | }
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| 93 | ~SkFaceRec() {}
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| 94 |
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| 95 | uint32_t ref() {
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| 96 | return ++fRefCnt;
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| 97 | }
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| 98 | };
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| 99 |
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| 100 | // Font Face list
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| 101 | static SkFaceRec* gFaceRecHead = NULL;
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| 102 |
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| 103 | static SkFaceRec* find_ft_face(uint32_t fontID) {
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| 104 | SkFaceRec* rec = gFaceRecHead;
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| 105 | while (rec) {
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| 106 | if (rec->fFontID == fontID) {
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| 107 | return rec;
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| 108 | }
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| 109 | rec = rec->fNext;
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| 110 | }
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| 111 |
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| 112 | return NULL;
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| 113 | }
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| 114 |
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| 115 | static SkFaceRec* insert_ft_face(const LOGFONT& lf) {
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| 116 | // need a const char*
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| 117 | uint32_t id = FontFaceChecksum(&(lf.lfFaceName[0]), GetFontStyle(lf));
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| 118 | SkFaceRec* rec = find_ft_face(id);
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| 119 | if (rec) {
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| 120 | return rec; // found?
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| 121 | }
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| 122 |
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| 123 | rec = SkNEW(SkFaceRec);
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| 124 | rec->fFontID = id;
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| 125 | memcpy(&(rec->fFace), &lf, sizeof(LOGFONT));
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| 126 | rec->fNext = gFaceRecHead;
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| 127 | gFaceRecHead = rec;
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| 128 |
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| 129 | return rec;
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| 130 | }
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| 131 |
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| 132 | static void unref_ft_face(uint32_t fontID) {
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| 133 |
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| 134 | SkFaceRec* rec = gFaceRecHead;
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| 135 | SkFaceRec* prev = NULL;
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| 136 | while (rec) {
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| 137 | SkFaceRec* next = rec->fNext;
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| 138 | if (rec->fFontID == fontID) {
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| 139 | if (--rec->fRefCnt == 0) {
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| 140 | if (prev)
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| 141 | prev->fNext = next;
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| 142 | else
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| 143 | gFaceRecHead = next;
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| 144 |
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| 145 | SkDELETE(rec);
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| 146 | }
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| 147 | return;
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| 148 | }
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| 149 | prev = rec;
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| 150 | rec = next;
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| 151 | }
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| 152 | SkASSERT("shouldn't get here, face not in list");
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| 153 | }
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| 154 |
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| 155 | // have to do this because SkTypeface::SkTypeface() is protected
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| 156 | class FontFaceRec_Typeface : public SkTypeface {
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| 157 | public:
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| 158 |
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| 159 | FontFaceRec_Typeface(Style style, uint32_t id) : SkTypeface(style, id) {};
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| 160 |
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| 161 | virtual ~FontFaceRec_Typeface() {};
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| 162 | };
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| 163 |
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| 164 | static const LOGFONT* get_default_font() {
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| 165 | // don't hardcode on Windows, Win2000, XP, Vista, and international all have different default
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| 166 | // and the user could change too
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| 167 |
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| 168 | if (gDefaultFont.lfFaceName[0] != 0) {
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| 169 | return &gDefaultFont;
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| 170 | }
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| 171 |
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| 172 | NONCLIENTMETRICS ncm;
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| 173 | ncm.cbSize = sizeof(NONCLIENTMETRICS);
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| 174 | SystemParametersInfo(SPI_GETNONCLIENTMETRICS, sizeof(ncm), &ncm, 0);
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| 175 |
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| 176 | memcpy(&gDefaultFont, &(ncm.lfMessageFont), sizeof(LOGFONT));
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| 177 |
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| 178 | return &gDefaultFont;
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| 179 | }
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| 180 |
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| 181 | static SkTypeface* CreateTypeface_(const LOGFONT& lf) {
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| 182 |
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| 183 | SkTypeface::Style style = GetFontStyle(lf);
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| 184 | FontFaceRec_Typeface* ptypeface = new FontFaceRec_Typeface(style, FontFaceChecksum(lf.lfFaceName, style));
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| 185 |
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| 186 | if (NULL == ptypeface) {
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| 187 | SkASSERT(false);
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| 188 | return NULL;
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| 189 | }
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| 190 |
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| 191 | SkFaceRec* rec = insert_ft_face(lf);
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| 192 | SkASSERT(rec);
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| 193 |
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| 194 | return ptypeface;
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| 195 | }
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| 196 |
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| 197 | class SkScalerContext_Windows : public SkScalerContext {
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| 198 | public:
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| 199 | SkScalerContext_Windows(const SkDescriptor* desc);
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| 200 | virtual ~SkScalerContext_Windows();
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| 201 |
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| 202 | protected:
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| 203 | virtual unsigned generateGlyphCount() const;
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| 204 | virtual uint16_t generateCharToGlyph(SkUnichar uni);
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| 205 | virtual void generateAdvance(SkGlyph* glyph);
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| 206 | virtual void generateMetrics(SkGlyph* glyph);
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| 207 | virtual void generateImage(const SkGlyph& glyph);
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| 208 | virtual void generatePath(const SkGlyph& glyph, SkPath* path);
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| 209 | virtual void generateLineHeight(SkPoint* ascent, SkPoint* descent);
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| 210 | virtual void generateFontMetrics(SkPaint::FontMetrics* mX, SkPaint::FontMetrics* mY);
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| 211 | //virtual SkDeviceContext getDC() {return ddc;}
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| 212 | private:
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| 213 | uint32_t fFontID;
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| 214 | LOGFONT lf;
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| 215 | MAT2 mat22;
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| 216 | HDC ddc;
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| 217 | HFONT savefont;
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| 218 | HFONT font;
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| 219 | };
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| 220 |
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| 221 | SkScalerContext_Windows::SkScalerContext_Windows(const SkDescriptor* desc) : SkScalerContext(desc), ddc(0), font(0), savefont(0) {
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| 222 | SkAutoMutexAcquire ac(gFTMutex);
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| 223 |
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| 224 | fFontID = fRec.fFontID;
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| 225 | SkFaceRec* rec = find_ft_face(fRec.fFontID);
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| 226 | if (rec) {
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| 227 | rec->ref();
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| 228 | memcpy(&lf, &(rec->fFace), sizeof(LOGFONT));
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| 229 | }
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| 230 | else {
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| 231 | SkASSERT(false);
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| 232 | memcpy(&lf, &gDefaultFont, sizeof(LOGFONT));
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| 233 | }
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| 234 |
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| 235 | mat22.eM11 = SkScalarToFIXED(fRec.fPost2x2[0][0]);
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| 236 | mat22.eM12 = SkScalarToFIXED(-fRec.fPost2x2[0][1]);
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| 237 | mat22.eM21 = SkScalarToFIXED(fRec.fPost2x2[1][0]);
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| 238 | mat22.eM22 = SkScalarToFIXED(-fRec.fPost2x2[1][1]);
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| 239 |
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| 240 | ddc = ::CreateCompatibleDC(NULL);
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| 241 | SetBkMode(ddc, TRANSPARENT);
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| 242 |
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| 243 | lf.lfHeight = SkScalarFloor(fRec.fTextSize);
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| 244 | font = CreateFontIndirect(&lf);
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| 245 | savefont = (HFONT)SelectObject(ddc, font);
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| 246 | }
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| 247 |
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| 248 | SkScalerContext_Windows::~SkScalerContext_Windows() {
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| 249 | unref_ft_face(fFontID);
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| 250 |
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| 251 | if (ddc) {
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| 252 | ::SelectObject(ddc, savefont);
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| 253 | ::DeleteDC(ddc);
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| 254 | ddc = NULL;
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| 255 | }
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| 256 | if (font) {
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| 257 | ::DeleteObject(font);
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| 258 | }
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| 259 | }
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| 260 |
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| 261 | unsigned SkScalerContext_Windows::generateGlyphCount() const {
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| 262 | return 0xFFFF;
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| 263 | // return fFace->num_glyphs;
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| 264 | }
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| 265 |
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| 266 | uint16_t SkScalerContext_Windows::generateCharToGlyph(SkUnichar uni) {
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| 267 |
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| 268 | //uint16_t index = 0;
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| 269 | //GetGlyphIndicesW(ddc, &(uint16_t&)uni, 1, &index, 0);
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| 270 | //return index;
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| 271 |
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| 272 | // let's just use the uni as index on Windows
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| 273 | return SkToU16(uni);
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| 274 | }
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| 275 |
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| 276 | void SkScalerContext_Windows::generateAdvance(SkGlyph* glyph) {
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| 277 | this->generateMetrics(glyph);
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| 278 | }
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| 279 |
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| 280 | void SkScalerContext_Windows::generateMetrics(SkGlyph* glyph) {
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| 281 |
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| 282 | SkASSERT(ddc);
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| 283 |
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| 284 | GLYPHMETRICS gm;
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| 285 | memset(&gm, 0, sizeof(gm));
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| 286 |
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| 287 | glyph->fRsbDelta = 0;
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| 288 | glyph->fLsbDelta = 0;
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| 289 |
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| 290 | UINT glyphIndexFlag = 0; //glyph->fIsCodePoint ? 0 : GGO_GLYPH_INDEX;
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| 291 | // UINT glyphIndexFlag = GGO_GLYPH_INDEX;
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| 292 | // Note: need to use GGO_GRAY8_BITMAP instead of GGO_METRICS because GGO_METRICS returns a smaller
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| 293 | // BlackBlox; we need the bigger one in case we need the image. fAdvance is the same.
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| 294 | uint32_t ret = GetGlyphOutlineW(ddc, glyph->getGlyphID(0), GGO_GRAY8_BITMAP | glyphIndexFlag, &gm, 0, NULL, &mat22);
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| 295 |
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| 296 | if (GDI_ERROR != ret) {
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| 297 | if (ret == 0) {
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| 298 | // for white space, ret is zero and gmBlackBoxX, gmBlackBoxY are 1 incorrectly!
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| 299 | gm.gmBlackBoxX = gm.gmBlackBoxY = 0;
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| 300 | }
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| 301 | glyph->fWidth = gm.gmBlackBoxX;
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| 302 | glyph->fHeight = gm.gmBlackBoxY;
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| 303 | glyph->fTop = SkToS16(gm.gmptGlyphOrigin.y - gm.gmBlackBoxY);
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| 304 | glyph->fLeft = SkToS16(gm.gmptGlyphOrigin.x);
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| 305 | glyph->fAdvanceX = SkIntToFixed(gm.gmCellIncX);
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| 306 | glyph->fAdvanceY = -SkIntToFixed(gm.gmCellIncY);
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| 307 | } else {
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| 308 | glyph->fWidth = 0;
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| 309 | }
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| 310 |
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| 311 | #if 0
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| 312 | char buf[1024];
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| 313 | sprintf(buf, "generateMetrics: id:%d, w=%d, h=%d, font:%s, fh:%d\n", glyph->fID, glyph->fWidth, glyph->fHeight, lf.lfFaceName, lf.lfHeight);
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| 314 | OutputDebugString(buf);
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| 315 | #endif
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| 316 | }
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| 317 |
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| 318 | void SkScalerContext_Windows::generateFontMetrics(SkPaint::FontMetrics* mx, SkPaint::FontMetrics* my) {
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| 319 | //SkASSERT(false);
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| 320 | if (mx)
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| 321 | memset(mx, 0, sizeof(SkPaint::FontMetrics));
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| 322 | if (my)
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| 323 | memset(my, 0, sizeof(SkPaint::FontMetrics));
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| 324 | return;
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| 325 | }
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| 326 |
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| 327 | void SkScalerContext_Windows::generateImage(const SkGlyph& glyph) {
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| 328 |
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| 329 | SkAutoMutexAcquire ac(gFTMutex);
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| 330 |
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| 331 | SkASSERT(ddc);
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| 332 |
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| 333 | GLYPHMETRICS gm;
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| 334 | memset(&gm, 0, sizeof(gm));
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| 335 |
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| 336 | #if 0
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| 337 | char buf[1024];
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| 338 | sprintf(buf, "generateImage: id:%d, w=%d, h=%d, font:%s,fh:%d\n", glyph.fID, glyph.fWidth, glyph.fHeight, lf.lfFaceName, lf.lfHeight);
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| 339 | OutputDebugString(buf);
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| 340 | #endif
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| 341 |
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| 342 | uint32_t bytecount = 0;
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| 343 | UINT glyphIndexFlag = 0; //glyph.fIsCodePoint ? 0 : GGO_GLYPH_INDEX;
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| 344 | // UINT glyphIndexFlag = GGO_GLYPH_INDEX;
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| 345 | uint32_t total_size = GetGlyphOutlineW(ddc, glyph.fID, GGO_GRAY8_BITMAP | glyphIndexFlag, &gm, 0, NULL, &mat22);
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| 346 | if (GDI_ERROR != total_size && total_size > 0) {
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| 347 | uint8_t *pBuff = new uint8_t[total_size];
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| 348 | if (NULL != pBuff) {
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| 349 | total_size = GetGlyphOutlineW(ddc, glyph.fID, GGO_GRAY8_BITMAP | glyphIndexFlag, &gm, total_size, pBuff, &mat22);
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| 350 |
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| 351 | SkASSERT(total_size != GDI_ERROR);
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| 352 |
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| 353 | SkASSERT(glyph.fWidth == gm.gmBlackBoxX);
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| 354 | SkASSERT(glyph.fHeight == gm.gmBlackBoxY);
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| 355 |
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| 356 | uint8_t* dst = (uint8_t*)glyph.fImage;
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| 357 | uint32_t pitch = (gm.gmBlackBoxX + 3) & ~0x3;
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| 358 | if (pitch != glyph.rowBytes()) {
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| 359 | SkASSERT(false); // glyph.fImage has different rowsize!?
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| 360 | }
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| 361 |
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| 362 | for (int32_t y = gm.gmBlackBoxY - 1; y >= 0; y--) {
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| 363 | uint8_t* src = pBuff + pitch * y;
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| 364 |
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| 365 | for (uint32_t x = 0; x < gm.gmBlackBoxX; x++) {
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| 366 | if (*src > 63) {
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| 367 | *dst = 0xFF;
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| 368 | }
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| 369 | else {
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| 370 | *dst = *src << 2; // scale to 0-255
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| 371 | }
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| 372 | dst++;
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| 373 | src++;
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| 374 | bytecount++;
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| 375 | }
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| 376 | memset(dst, 0, glyph.rowBytes() - glyph.fWidth);
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| 377 | dst += glyph.rowBytes() - glyph.fWidth;
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| 378 | }
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| 379 |
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| 380 | delete[] pBuff;
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| 381 | }
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| 382 | }
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| 383 |
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| 384 | SkASSERT(GDI_ERROR != total_size && total_size >= 0);
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| 385 |
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| 386 | }
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| 387 |
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| 388 | void SkScalerContext_Windows::generatePath(const SkGlyph& glyph, SkPath* path) {
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| 389 |
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| 390 | SkAutoMutexAcquire ac(gFTMutex);
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| 391 |
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| 392 | SkASSERT(&glyph && path);
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| 393 | SkASSERT(ddc);
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| 394 |
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| 395 | path->reset();
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| 396 |
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| 397 | #if 0
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| 398 | char buf[1024];
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| 399 | sprintf(buf, "generatePath: id:%d, w=%d, h=%d, font:%s,fh:%d\n", glyph.fID, glyph.fWidth, glyph.fHeight, lf.lfFaceName, lf.lfHeight);
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| 400 | OutputDebugString(buf);
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| 401 | #endif
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| 402 |
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| 403 | GLYPHMETRICS gm;
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| 404 | UINT glyphIndexFlag = 0; //glyph.fIsCodePoint ? 0 : GGO_GLYPH_INDEX;
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| 405 | uint32_t total_size = GetGlyphOutlineW(ddc, glyph.fID, GGO_NATIVE | glyphIndexFlag, &gm, BUFFERSIZE, glyphbuf, &mat22);
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| 406 |
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| 407 | if (GDI_ERROR != total_size) {
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| 408 |
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| 409 | const uint8_t* cur_glyph = glyphbuf;
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| 410 | const uint8_t* end_glyph = glyphbuf + total_size;
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| 411 |
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| 412 | while(cur_glyph < end_glyph) {
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| 413 | const TTPOLYGONHEADER* th = (TTPOLYGONHEADER*)cur_glyph;
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| 414 |
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| 415 | const uint8_t* end_poly = cur_glyph + th->cb;
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| 416 | const uint8_t* cur_poly = cur_glyph + sizeof(TTPOLYGONHEADER);
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| 417 |
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| 418 | path->moveTo(SkFixedToScalar(*(SkFixed*)(&th->pfxStart.x)), SkFixedToScalar(*(SkFixed*)(&th->pfxStart.y)));
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| 419 |
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| 420 | while(cur_poly < end_poly) {
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| 421 | const TTPOLYCURVE* pc = (const TTPOLYCURVE*)cur_poly;
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| 422 |
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| 423 | if (pc->wType == TT_PRIM_LINE) {
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| 424 | for (uint16_t i = 0; i < pc->cpfx; i++) {
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| 425 | path->lineTo(SkFixedToScalar(*(SkFixed*)(&pc->apfx[i].x)), SkFixedToScalar(*(SkFixed*)(&pc->apfx[i].y)));
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| 426 | }
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| 427 | }
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| 428 |
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| 429 | if (pc->wType == TT_PRIM_QSPLINE) {
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| 430 | for (uint16_t u = 0; u < pc->cpfx - 1; u++) { // Walk through points in spline
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| 431 | POINTFX pnt_b = pc->apfx[u]; // B is always the current point
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| 432 | POINTFX pnt_c = pc->apfx[u+1];
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| 433 |
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| 434 | if (u < pc->cpfx - 2) { // If not on last spline, compute C
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| 435 | pnt_c.x = SkFixedToFIXED(SkFixedAve(*(SkFixed*)(&pnt_b.x), *(SkFixed*)(&pnt_c.x)));
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| 436 | pnt_c.y = SkFixedToFIXED(SkFixedAve(*(SkFixed*)(&pnt_b.y), *(SkFixed*)(&pnt_c.y)));
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| 437 | }
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| 438 |
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| 439 | path->quadTo(SkFixedToScalar(*(SkFixed*)(&pnt_b.x)), SkFixedToScalar(*(SkFixed*)(&pnt_b.y)), SkFixedToScalar(*(SkFixed*)(&pnt_c.x)), SkFixedToScalar(*(SkFixed*)(&pnt_c.y)));
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| 440 | }
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| 441 | }
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| 442 | cur_poly += sizeof(uint16_t) * 2 + sizeof(POINTFX) * pc->cpfx;
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| 443 | }
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| 444 | cur_glyph += th->cb;
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| 445 | path->close();
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| 446 | }
|
| 447 | }
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| 448 | else {
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| 449 | SkASSERT(false);
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| 450 | }
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| 451 | //char buf[1024];
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| 452 | //sprintf(buf, "generatePath: count:%d\n", count);
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| 453 | //OutputDebugString(buf);
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| 454 | }
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| 455 |
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| 456 |
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| 457 | // Note: not sure this is the correct implementation
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| 458 | void SkScalerContext_Windows::generateLineHeight(SkPoint* ascent, SkPoint* descent) {
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| 459 |
|
| 460 | SkASSERT(ddc);
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| 461 |
|
| 462 | OUTLINETEXTMETRIC otm;
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| 463 |
|
| 464 | uint32_t ret = GetOutlineTextMetrics(ddc, sizeof(otm), &otm);
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| 465 |
|
| 466 | if (sizeof(otm) == ret) {
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| 467 | if (ascent)
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| 468 | ascent->iset(0, otm.otmAscent);
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| 469 | if (descent)
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| 470 | descent->iset(0, otm.otmDescent);
|
| 471 | }
|
| 472 |
|
| 473 | return;
|
| 474 | }
|
| 475 |
|
| 476 | void SkFontHost::Serialize(const SkTypeface* face, SkWStream* stream) {
|
| 477 | SkASSERT(!"SkFontHost::Serialize unimplemented");
|
| 478 | }
|
| 479 |
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| 480 | SkTypeface* SkFontHost::Deserialize(SkStream* stream) {
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| 481 | SkASSERT(!"SkFontHost::Deserialize unimplemented");
|
| 482 | return NULL;
|
| 483 | }
|
| 484 |
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| 485 | SkTypeface* SkFontHost::CreateTypeface(SkStream* stream) {
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| 486 |
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| 487 | //Should not be used on Windows, keep linker happy
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| 488 | SkASSERT(false);
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| 489 | get_default_font();
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| 490 | return CreateTypeface_(gDefaultFont);
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| 491 | }
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| 492 |
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| 493 | SkScalerContext* SkFontHost::CreateScalerContext(const SkDescriptor* desc) {
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| 494 | return SkNEW_ARGS(SkScalerContext_Windows, (desc));
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| 495 | }
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| 496 |
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| 497 | SkScalerContext* SkFontHost::CreateFallbackScalerContext(const SkScalerContext::Rec& rec) {
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| 498 | get_default_font();
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| 499 |
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| 500 | SkAutoDescriptor ad(sizeof(rec) + sizeof(gDefaultFont) + SkDescriptor::ComputeOverhead(2));
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| 501 | SkDescriptor* desc = ad.getDesc();
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| 502 |
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| 503 | desc->init();
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| 504 | SkScalerContext::Rec* newRec =
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| 505 | (SkScalerContext::Rec*)desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec);
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| 506 |
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| 507 | get_default_font();
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| 508 | CreateTypeface_(gDefaultFont);
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| 509 | newRec->fFontID = FontFaceChecksum(gDefaultFont.lfFaceName, GetFontStyle(gDefaultFont));
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| 510 | desc->computeChecksum();
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| 511 |
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| 512 | return SkFontHost::CreateScalerContext(desc);
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| 513 | }
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| 514 |
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| 515 | /** Return the closest matching typeface given either an existing family
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| 516 | (specified by a typeface in that family) or by a familyName, and a
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| 517 | requested style.
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| 518 | 1) If familyFace is null, use famillyName.
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| 519 | 2) If famillyName is null, use familyFace.
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| 520 | 3) If both are null, return the default font that best matches style
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| 521 | This MUST not return NULL.
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| 522 | */
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| 523 |
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| 524 | SkTypeface* SkFontHost::FindTypeface(const SkTypeface* familyFace, const char familyName[], SkTypeface::Style style) {
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| 525 |
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| 526 | SkAutoMutexAcquire ac(gFTMutex);
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| 527 |
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| 528 | #ifndef CAN_USE_LOGFONT_NAME
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| 529 | familyName = NULL;
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| 530 | familyFace = NULL;
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| 531 | #endif
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| 532 |
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| 533 | // clip to legal style bits
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| 534 | style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);
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| 535 |
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| 536 | SkTypeface* tf = NULL;
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| 537 | if (NULL == familyFace && NULL == familyName) {
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| 538 | LOGFONT lf;
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| 539 | get_default_font();
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| 540 | memcpy(&lf, &gDefaultFont, sizeof(LOGFONT));
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| 541 | lf.lfWeight = (style & SkTypeface::kBold) != 0 ? FW_BOLD : FW_NORMAL ;
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| 542 | lf.lfItalic = ((style & SkTypeface::kItalic) != 0);
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| 543 | tf = CreateTypeface_(lf);
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| 544 | } else {
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| 545 | #ifdef CAN_USE_LOGFONT_NAME
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| 546 | LOGFONT lf;
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| 547 | if (NULL != familyFace) {
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| 548 | uint32_t id = familyFace->uniqueID();
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| 549 | SkFaceRec* rec = find_ft_face(id);
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| 550 | if (!rec) {
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| 551 | SkASSERT(false);
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| 552 | get_default_font();
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| 553 | memcpy(&lf, &gDefaultFont, sizeof(LOGFONT));
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| 554 | }
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| 555 | else {
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| 556 | memcpy(&lf, &(rec->fFace), sizeof(LOGFONT));
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| 557 | }
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| 558 | }
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| 559 | else {
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| 560 | memset(&lf, 0, sizeof(LOGFONT));
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| 561 |
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| 562 | lf.lfHeight = -11; // default
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| 563 | lf.lfQuality = PROOF_QUALITY;
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| 564 | lf.lfCharSet = DEFAULT_CHARSET;
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| 565 |
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| 566 | _tcsncpy(lf.lfFaceName, familyName, LF_FACESIZE);
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| 567 | lf.lfFaceName[LF_FACESIZE-1] = '\0';
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| 568 | }
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| 569 |
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| 570 | // use the style desired
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| 571 | lf.lfWeight = (style & SkTypeface::kBold) != 0 ? FW_BOLD : FW_NORMAL ;
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| 572 | lf.lfItalic = ((style & SkTypeface::kItalic) != 0);
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| 573 | tf = CreateTypeface_(lf);
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| 574 | #endif
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| 575 | }
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| 576 |
|
| 577 | if (NULL == tf) {
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| 578 | get_default_font();
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| 579 | tf = CreateTypeface_(gDefaultFont);
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| 580 | }
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| 581 | return tf;
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| 582 | }
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| 583 |
|
| 584 | size_t SkFontHost::ShouldPurgeFontCache(size_t sizeAllocatedSoFar) {
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| 585 | if (sizeAllocatedSoFar > FONT_CACHE_MEMORY_BUDGET)
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| 586 | return sizeAllocatedSoFar - FONT_CACHE_MEMORY_BUDGET;
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| 587 | else
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| 588 | return 0; // nothing to do
|
| 589 | }
|
| 590 |
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| 591 | int SkFontHost::ComputeGammaFlag(const SkPaint& paint) {
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| 592 | return 0;
|
| 593 | }
|
| 594 |
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| 595 | void SkFontHost::GetGammaTables(const uint8_t* tables[2]) {
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| 596 | tables[0] = NULL; // black gamma (e.g. exp=1.4)
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| 597 | tables[1] = NULL; // white gamma (e.g. exp= 1/1.4)
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| 598 | }
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| 599 |
|
| 600 | #endif // WIN32
|
| 601 |
|