submodule/skia/src/utils/SkTextUtils.cpp

   1 /*
   2  * Copyright 2018 Google Inc.
   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 "include/utils/SkTextUtils.h"
   9
  10 #include "include/core/SkCanvas.h"
  11 #include "include/core/SkFont.h"
  12 #include "include/core/SkFontTypes.h"
  13 #include "include/core/SkMatrix.h"
  14 #include "include/core/SkPath.h"
  15 #include "include/core/SkPoint.h"
  16 #include "include/core/SkScalar.h"
  17 #include "include/core/SkTextBlob.h"
  18 #include "include/private/SkTemplates.h"
  19 #include "src/core/SkFontPriv.h"
  20
  21 class SkPaint;
  22
  23 void SkTextUtils::Draw(SkCanvas* canvas, const void* text, size_t size, SkTextEncoding encoding,
  24                        SkScalar x, SkScalar y, const SkFont& font, const SkPaint& paint,
  25                        Align align) {
  26     if (align != kLeft_Align) {
  27         SkScalar width = font.measureText(text, size, encoding);
  28         if (align == kCenter_Align) {
  29             width *= 0.5f;
  30         }
  31         x -= width;
  32     }
  33
  34     canvas->drawTextBlob(SkTextBlob::MakeFromText(text, size, font, encoding), x, y, paint);
  35 }
  36
  37 void SkTextUtils::GetPath(const void* text, size_t length, SkTextEncoding encoding,
  38                           SkScalar x, SkScalar y, const SkFont& font, SkPath* path) {
  39     SkAutoToGlyphs ag(font, text, length, encoding);
  40     SkAutoTArray<SkPoint> pos(ag.count());
  41     font.getPos(ag.glyphs(), ag.count(), pos.get(), {x, y});
  42
  43     struct Rec {
  44         SkPath* fDst;
  45         const SkPoint* fPos;
  46     } rec = { path, pos.get() };
  47
  48     path->reset();
  49     font.getPaths(ag.glyphs(), ag.count(), [](const SkPath* src, const SkMatrix& mx, void* ctx) {
  50         Rec* rec = (Rec*)ctx;
  51         if (src) {
  52             SkMatrix m(mx);
  53             m.postTranslate(rec->fPos->fX, rec->fPos->fY);
  54             rec->fDst->addPath(*src, m);
  55         }
  56         rec->fPos += 1;
  57     }, &rec);
  58 }
  59