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* Copyright 2011 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "samplecode/Sample.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkGraphics.h"
#include "include/core/SkPath.h"
#include "include/core/SkRegion.h"
#include "include/core/SkShader.h"
#include "include/core/SkStream.h"
#include "include/core/SkTextBlob.h"
#include "include/core/SkTime.h"
#include "include/core/SkTypeface.h"
#include "include/effects/SkGradientShader.h"
#include "include/utils/SkRandom.h"
#include "modules/skshaper/include/SkShaper.h"
#include "src/core/SkOSFile.h"
#include "src/shaders/SkColorShader.h"
#include "src/utils/SkUTF.h"
static const char gText[] =
"When in the Course of human events it becomes necessary for one people "
"to dissolve the political bands which have connected them with another "
"and to assume among the powers of the earth, the separate and equal "
"station to which the Laws of Nature and of Nature's God entitle them, "
"a decent respect to the opinions of mankind requires that they should "
"declare the causes which impel them to the separation.";
class TextBoxView : public Sample {
TextBoxView() : fShaper(SkShaper::Make()) {}
SkString name() override { return SkString("TextBox"); }
void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
SkAutoCanvasRestore acr(canvas, true);
canvas->clipRect(SkRect::MakeWH(w, h));
SkScalar margin = 20;
SkPaint paint;
for (int i = 9; i < 24; i += 2) {
SkTextBlobBuilderRunHandler builder(gText, { margin, margin });
SkFont srcFont(nullptr, SkIntToScalar(i));
const char* utf8 = gText;
size_t utf8Bytes = sizeof(gText) - 1;
std::unique_ptr<SkShaper::BiDiRunIterator> bidi(
SkShaper::MakeBiDiRunIterator(utf8, utf8Bytes, 0xfe));
if (!bidi) {
std::unique_ptr<SkShaper::LanguageRunIterator> language(
SkShaper::MakeStdLanguageRunIterator(utf8, utf8Bytes));
if (!language) {
SkFourByteTag undeterminedScript = SkSetFourByteTag('Z','y','y','y');
std::unique_ptr<SkShaper::ScriptRunIterator> script(
SkShaper::MakeScriptRunIterator(utf8, utf8Bytes, undeterminedScript));
if (!script) {
std::unique_ptr<SkShaper::FontRunIterator> font(
SkShaper::MakeFontMgrRunIterator(utf8, utf8Bytes, srcFont, SkFontMgr::RefDefault(),
"Arial", SkFontStyle::Bold(), &*language));
if (!font) {
fShaper->shape(utf8, utf8Bytes, *font, *bidi, *script, *language, w - margin, &builder);
canvas->drawTextBlob(builder.makeBlob(), 0, 0, paint);
canvas->translate(0, builder.endPoint().y());
void onDrawContent(SkCanvas* canvas) override {
SkScalar width = this->width() / 3;
drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
canvas->translate(width, 0);
drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
canvas->translate(width, 0);
drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
canvas->translate(0, this->height()/2);
drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
std::unique_ptr<SkShaper> fShaper;
typedef Sample INHERITED;
DEF_SAMPLE( return new TextBoxView(); )