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| 1 /* | |
| 2 * Copyright 2006 The Android Open Source Project | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 #include "SkTextBox.h" | |
| 9 #include "SkUtils.h" | |
| 10 | |
| 11 static inline int is_ws(int c) | |
| 12 { | |
| 13 return !((c - 1) >> 5); | |
| 14 } | |
| 15 | |
| 16 static size_t linebreak(const char text[], const char stop[], | |
| 17 const SkPaint& paint, SkScalar margin, | |
| 18 size_t* trailing = NULL) | |
| 19 { | |
| 20 size_t lengthBreak = paint.breakText(text, stop - text, margin); | |
| 21 | |
| 22 //Check for white space or line breakers before the lengthBreak | |
| 23 const char* start = text; | |
| 24 const char* word_start = text; | |
| 25 int prevWS = true; | |
| 26 if (trailing) { | |
| 27 *trailing = 0; | |
| 28 } | |
| 29 | |
| 30 while (text < stop) { | |
| 31 const char* prevText = text; | |
| 32 SkUnichar uni = SkUTF8_NextUnichar(&text); | |
| 33 int currWS = is_ws(uni); | |
| 34 | |
| 35 if (!currWS && prevWS) { | |
| 36 word_start = prevText; | |
| 37 } | |
| 38 prevWS = currWS; | |
| 39 | |
| 40 if (text > start + lengthBreak) { | |
| 41 if (currWS) { | |
| 42 // eat the rest of the whitespace | |
| 43 while (text < stop && is_ws(SkUTF8_ToUnichar(text))) { | |
| 44 text += SkUTF8_CountUTF8Bytes(text); | |
| 45 } | |
| 46 if (trailing) { | |
| 47 *trailing = text - prevText; | |
| 48 } | |
| 49 } else { | |
| 50 // backup until a whitespace (or 1 char) | |
| 51 if (word_start == start) { | |
| 52 if (prevText > start) { | |
| 53 text = prevText; | |
| 54 } | |
| 55 } else { | |
| 56 text = word_start; | |
| 57 } | |
| 58 } | |
| 59 break; | |
| 60 } | |
| 61 | |
| 62 if ('\n' == uni) { | |
| 63 size_t ret = text - start; | |
| 64 size_t lineBreakSize = 1; | |
| 65 if (text < stop) { | |
| 66 uni = SkUTF8_NextUnichar(&text); | |
| 67 if ('\r' == uni) { | |
| 68 ret = text - start; | |
| 69 ++lineBreakSize; | |
| 70 } | |
| 71 } | |
| 72 if (trailing) { | |
| 73 *trailing = lineBreakSize; | |
| 74 } | |
| 75 return ret; | |
| 76 } | |
| 77 | |
| 78 if ('\r' == uni) { | |
| 79 size_t ret = text - start; | |
| 80 size_t lineBreakSize = 1; | |
| 81 if (text < stop) { | |
| 82 uni = SkUTF8_NextUnichar(&text); | |
| 83 if ('\n' == uni) { | |
| 84 ret = text - start; | |
| 85 ++lineBreakSize; | |
| 86 } | |
| 87 } | |
| 88 if (trailing) { | |
| 89 *trailing = lineBreakSize; | |
| 90 } | |
| 91 return ret; | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 return text - start; | |
| 96 } | |
| 97 | |
| 98 int SkTextLineBreaker::CountLines(const char text[], size_t len, const SkPaint&
paint, SkScalar width) | |
| 99 { | |
| 100 const char* stop = text + len; | |
| 101 int count = 0; | |
| 102 | |
| 103 if (width > 0) | |
| 104 { | |
| 105 do { | |
| 106 count += 1; | |
| 107 text += linebreak(text, stop, paint, width); | |
| 108 } while (text < stop); | |
| 109 } | |
| 110 return count; | |
| 111 } | |
| 112 | |
| 113 ////////////////////////////////////////////////////////////////////////////// | |
| 114 | |
| 115 SkTextBox::SkTextBox() | |
| 116 { | |
| 117 fBox.setEmpty(); | |
| 118 fSpacingMul = SK_Scalar1; | |
| 119 fSpacingAdd = 0; | |
| 120 fMode = kLineBreak_Mode; | |
| 121 fSpacingAlign = kStart_SpacingAlign; | |
| 122 } | |
| 123 | |
| 124 void SkTextBox::setMode(Mode mode) | |
| 125 { | |
| 126 SkASSERT((unsigned)mode < kModeCount); | |
| 127 fMode = SkToU8(mode); | |
| 128 } | |
| 129 | |
| 130 void SkTextBox::setSpacingAlign(SpacingAlign align) | |
| 131 { | |
| 132 SkASSERT((unsigned)align < kSpacingAlignCount); | |
| 133 fSpacingAlign = SkToU8(align); | |
| 134 } | |
| 135 | |
| 136 void SkTextBox::getBox(SkRect* box) const | |
| 137 { | |
| 138 if (box) | |
| 139 *box = fBox; | |
| 140 } | |
| 141 | |
| 142 void SkTextBox::setBox(const SkRect& box) | |
| 143 { | |
| 144 fBox = box; | |
| 145 } | |
| 146 | |
| 147 void SkTextBox::setBox(SkScalar left, SkScalar top, SkScalar right, SkScalar bot
tom) | |
| 148 { | |
| 149 fBox.set(left, top, right, bottom); | |
| 150 } | |
| 151 | |
| 152 void SkTextBox::getSpacing(SkScalar* mul, SkScalar* add) const | |
| 153 { | |
| 154 if (mul) | |
| 155 *mul = fSpacingMul; | |
| 156 if (add) | |
| 157 *add = fSpacingAdd; | |
| 158 } | |
| 159 | |
| 160 void SkTextBox::setSpacing(SkScalar mul, SkScalar add) | |
| 161 { | |
| 162 fSpacingMul = mul; | |
| 163 fSpacingAdd = add; | |
| 164 } | |
| 165 | |
| 166 ////////////////////////////////////////////////////////////////////////////////
///////////// | |
| 167 | |
| 168 void SkTextBox::draw(SkCanvas* canvas, const char text[], size_t len, const SkPa
int& paint) | |
| 169 { | |
| 170 SkASSERT(canvas && (text || len == 0)); | |
| 171 | |
| 172 SkScalar marginWidth = fBox.width(); | |
| 173 | |
| 174 if (marginWidth <= 0 || len == 0) | |
| 175 return; | |
| 176 | |
| 177 const char* textStop = text + len; | |
| 178 | |
| 179 SkScalar x, y, scaledSpacing, height, fontHeight; | |
| 180 SkPaint::FontMetrics metrics; | |
| 181 | |
| 182 switch (paint.getTextAlign()) { | |
| 183 case SkPaint::kLeft_Align: | |
| 184 x = 0; | |
| 185 break; | |
| 186 case SkPaint::kCenter_Align: | |
| 187 x = SkScalarHalf(marginWidth); | |
| 188 break; | |
| 189 default: | |
| 190 x = marginWidth; | |
| 191 break; | |
| 192 } | |
| 193 x += fBox.fLeft; | |
| 194 | |
| 195 fontHeight = paint.getFontMetrics(&metrics); | |
| 196 scaledSpacing = SkScalarMul(fontHeight, fSpacingMul) + fSpacingAdd; | |
| 197 height = fBox.height(); | |
| 198 | |
| 199 // compute Y position for first line | |
| 200 { | |
| 201 SkScalar textHeight = fontHeight; | |
| 202 | |
| 203 if (fMode == kLineBreak_Mode && fSpacingAlign != kStart_SpacingAlign) | |
| 204 { | |
| 205 int count = SkTextLineBreaker::CountLines(text, textStop - text, pai
nt, marginWidth); | |
| 206 SkASSERT(count > 0); | |
| 207 textHeight += scaledSpacing * (count - 1); | |
| 208 } | |
| 209 | |
| 210 switch (fSpacingAlign) { | |
| 211 case kStart_SpacingAlign: | |
| 212 y = 0; | |
| 213 break; | |
| 214 case kCenter_SpacingAlign: | |
| 215 y = SkScalarHalf(height - textHeight); | |
| 216 break; | |
| 217 default: | |
| 218 SkASSERT(fSpacingAlign == kEnd_SpacingAlign); | |
| 219 y = height - textHeight; | |
| 220 break; | |
| 221 } | |
| 222 y += fBox.fTop - metrics.fAscent; | |
| 223 } | |
| 224 | |
| 225 for (;;) | |
| 226 { | |
| 227 size_t trailing; | |
| 228 len = linebreak(text, textStop, paint, marginWidth, &trailing); | |
| 229 if (y + metrics.fDescent + metrics.fLeading > 0) | |
| 230 canvas->drawText(text, len - trailing, x, y, paint); | |
| 231 text += len; | |
| 232 if (text >= textStop) | |
| 233 break; | |
| 234 y += scaledSpacing; | |
| 235 if (y + metrics.fAscent >= fBox.fBottom) | |
| 236 break; | |
| 237 } | |
| 238 } | |
| 239 | |
| 240 /////////////////////////////////////////////////////////////////////////////// | |
| 241 | |
| 242 void SkTextBox::setText(const char text[], size_t len, const SkPaint& paint) { | |
| 243 fText = text; | |
| 244 fLen = len; | |
| 245 fPaint = &paint; | |
| 246 } | |
| 247 | |
| 248 void SkTextBox::draw(SkCanvas* canvas) { | |
| 249 this->draw(canvas, fText, fLen, *fPaint); | |
| 250 } | |
| 251 | |
| 252 int SkTextBox::countLines() const { | |
| 253 return SkTextLineBreaker::CountLines(fText, fLen, *fPaint, fBox.width()); | |
| 254 } | |
| 255 | |
| 256 SkScalar SkTextBox::getTextHeight() const { | |
| 257 SkScalar spacing = SkScalarMul(fPaint->getTextSize(), fSpacingMul) + fSpacin
gAdd; | |
| 258 return this->countLines() * spacing; | |
| 259 } | |
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Chromium Code Reviews
Issue 696293005:
move SkTextBox into utils (Closed)
Base URL: https://skia.googlesource.com/skia.git@master