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| 1 /* libs/graphics/views/SkTextBox.cpp | |
| 2 ** | |
| 3 ** Copyright 2006, The Android Open Source Project | |
| 4 ** | |
| 5 ** Licensed under the Apache License, Version 2.0 (the "License"); | |
| 6 ** you may not use this file except in compliance with the License. | |
| 7 ** You may obtain a copy of the License at | |
| 8 ** | |
| 9 ** http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 ** | |
| 11 ** Unless required by applicable law or agreed to in writing, software | |
| 12 ** distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 ** See the License for the specific language governing permissions and | |
| 15 ** limitations under the License. | |
| 16 */ | |
| 17 | |
| 18 #include "SkTextBox.h" | |
| 19 #include "SkGlyphCache.h" | |
| 20 #include "SkUtils.h" | |
| 21 #include "SkAutoKern.h" | |
| 22 | |
| 23 static inline int is_ws(int c) | |
| 24 { | |
| 25 return !((c - 1) >> 5); | |
| 26 } | |
| 27 | |
| 28 static size_t linebreak(const char text[], const char stop[], const SkPaint& pai
nt, SkScalar margin) | |
| 29 { | |
| 30 const char* start = text; | |
| 31 | |
| 32 SkAutoGlyphCache ac(paint, NULL); | |
| 33 SkGlyphCache* cache = ac.getCache(); | |
| 34 SkFixed w = 0; | |
| 35 SkFixed limit = SkScalarToFixed(margin); | |
| 36 SkAutoKern autokern; | |
| 37 | |
| 38 const char* word_start = text; | |
| 39 int prevWS = true; | |
| 40 | |
| 41 while (text < stop) | |
| 42 { | |
| 43 const char* prevText = text; | |
| 44 SkUnichar uni = SkUTF8_NextUnichar(&text); | |
| 45 int currWS = is_ws(uni); | |
| 46 const SkGlyph& glyph = cache->getUnicharMetrics(uni); | |
| 47 | |
| 48 if (!currWS && prevWS) | |
| 49 word_start = prevText; | |
| 50 prevWS = currWS; | |
| 51 | |
| 52 w += autokern.adjust(glyph) + glyph.fAdvanceX; | |
| 53 if (w > limit) | |
| 54 { | |
| 55 if (currWS) // eat the rest of the whitespace | |
| 56 { | |
| 57 while (text < stop && is_ws(SkUTF8_ToUnichar(text))) | |
| 58 text += SkUTF8_CountUTF8Bytes(text); | |
| 59 } | |
| 60 else // backup until a whitespace (or 1 char) | |
| 61 { | |
| 62 if (word_start == start) | |
| 63 { | |
| 64 if (prevText > start) | |
| 65 text = prevText; | |
| 66 } | |
| 67 else | |
| 68 text = word_start; | |
| 69 } | |
| 70 break; | |
| 71 } | |
| 72 } | |
| 73 return text - start; | |
| 74 } | |
| 75 | |
| 76 int SkTextLineBreaker::CountLines(const char text[], size_t len, const SkPaint&
paint, SkScalar width) | |
| 77 { | |
| 78 const char* stop = text + len; | |
| 79 int count = 0; | |
| 80 | |
| 81 if (width > 0) | |
| 82 { | |
| 83 do { | |
| 84 count += 1; | |
| 85 text += linebreak(text, stop, paint, width); | |
| 86 } while (text < stop); | |
| 87 } | |
| 88 return count; | |
| 89 } | |
| 90 | |
| 91 ////////////////////////////////////////////////////////////////////////////// | |
| 92 | |
| 93 SkTextBox::SkTextBox() | |
| 94 { | |
| 95 fBox.setEmpty(); | |
| 96 fSpacingMul = SK_Scalar1; | |
| 97 fSpacingAdd = 0; | |
| 98 fMode = kLineBreak_Mode; | |
| 99 fSpacingAlign = kStart_SpacingAlign; | |
| 100 } | |
| 101 | |
| 102 void SkTextBox::setMode(Mode mode) | |
| 103 { | |
| 104 SkASSERT((unsigned)mode < kModeCount); | |
| 105 fMode = SkToU8(mode); | |
| 106 } | |
| 107 | |
| 108 void SkTextBox::setSpacingAlign(SpacingAlign align) | |
| 109 { | |
| 110 SkASSERT((unsigned)align < kSpacingAlignCount); | |
| 111 fSpacingAlign = SkToU8(align); | |
| 112 } | |
| 113 | |
| 114 void SkTextBox::getBox(SkRect* box) const | |
| 115 { | |
| 116 if (box) | |
| 117 *box = fBox; | |
| 118 } | |
| 119 | |
| 120 void SkTextBox::setBox(const SkRect& box) | |
| 121 { | |
| 122 fBox = box; | |
| 123 } | |
| 124 | |
| 125 void SkTextBox::setBox(SkScalar left, SkScalar top, SkScalar right, SkScalar bot
tom) | |
| 126 { | |
| 127 fBox.set(left, top, right, bottom); | |
| 128 } | |
| 129 | |
| 130 void SkTextBox::getSpacing(SkScalar* mul, SkScalar* add) const | |
| 131 { | |
| 132 if (mul) | |
| 133 *mul = fSpacingMul; | |
| 134 if (add) | |
| 135 *add = fSpacingAdd; | |
| 136 } | |
| 137 | |
| 138 void SkTextBox::setSpacing(SkScalar mul, SkScalar add) | |
| 139 { | |
| 140 fSpacingMul = mul; | |
| 141 fSpacingAdd = add; | |
| 142 } | |
| 143 | |
| 144 ////////////////////////////////////////////////////////////////////////////////
///////////// | |
| 145 | |
| 146 void SkTextBox::draw(SkCanvas* canvas, const char text[], size_t len, const SkPa
int& paint) | |
| 147 { | |
| 148 SkASSERT(canvas && &paint && (text || len == 0)); | |
| 149 | |
| 150 SkScalar marginWidth = fBox.width(); | |
| 151 | |
| 152 if (marginWidth <= 0 || len == 0) | |
| 153 return; | |
| 154 | |
| 155 const char* textStop = text + len; | |
| 156 | |
| 157 SkScalar x, y, scaledSpacing, height, fontHeight; | |
| 158 SkPaint::FontMetrics metrics; | |
| 159 | |
| 160 switch (paint.getTextAlign()) { | |
| 161 case SkPaint::kLeft_Align: | |
| 162 x = 0; | |
| 163 break; | |
| 164 case SkPaint::kCenter_Align: | |
| 165 x = SkScalarHalf(marginWidth); | |
| 166 break; | |
| 167 default: | |
| 168 x = marginWidth; | |
| 169 break; | |
| 170 } | |
| 171 x += fBox.fLeft; | |
| 172 | |
| 173 fontHeight = paint.getFontMetrics(&metrics); | |
| 174 scaledSpacing = SkScalarMul(fontHeight, fSpacingMul) + fSpacingAdd; | |
| 175 height = fBox.height(); | |
| 176 | |
| 177 // compute Y position for first line | |
| 178 { | |
| 179 SkScalar textHeight = fontHeight; | |
| 180 | |
| 181 if (fMode == kLineBreak_Mode && fSpacingAlign != kStart_SpacingAlign) | |
| 182 { | |
| 183 int count = SkTextLineBreaker::CountLines(text, textStop - text, pai
nt, marginWidth); | |
| 184 SkASSERT(count > 0); | |
| 185 textHeight += scaledSpacing * (count - 1); | |
| 186 } | |
| 187 | |
| 188 switch (fSpacingAlign) { | |
| 189 case kStart_SpacingAlign: | |
| 190 y = 0; | |
| 191 break; | |
| 192 case kCenter_SpacingAlign: | |
| 193 y = SkScalarHalf(height - textHeight); | |
| 194 break; | |
| 195 default: | |
| 196 SkASSERT(fSpacingAlign == kEnd_SpacingAlign); | |
| 197 y = height - textHeight; | |
| 198 break; | |
| 199 } | |
| 200 y += fBox.fTop - metrics.fAscent; | |
| 201 } | |
| 202 | |
| 203 for (;;) | |
| 204 { | |
| 205 len = linebreak(text, textStop, paint, marginWidth); | |
| 206 if (y + metrics.fDescent + metrics.fLeading > 0) | |
| 207 canvas->drawText(text, len, x, y, paint); | |
| 208 text += len; | |
| 209 if (text >= textStop) | |
| 210 break; | |
| 211 y += scaledSpacing; | |
| 212 if (y + metrics.fAscent >= height) | |
| 213 break; | |
| 214 } | |
| 215 } | |
| 216 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/