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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 "Sample.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkColorFilter.h"
#include "SkColorPriv.h"
#include "SkColorShader.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkOSFile.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkShaper.h"
#include "SkStream.h"
#include "SkTextBlob.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "SkUTF.h"
extern void skia_set_text_gamma(float blackGamma, float whiteGamma);
#if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
extern SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT&);
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() {
#if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
sk_bzero(&lf, sizeof(lf));
lf.lfHeight = 9;
SkTypeface* tf0 = SkCreateTypefaceFromLOGFONT(lf);
lf.lfHeight = 12;
SkTypeface* tf1 = SkCreateTypefaceFromLOGFONT(lf);
// we assert that different sizes should not affect which face we get
SkASSERT(tf0 == tf1);
bool onQuery(Sample::Event* evt) override {
if (Sample::TitleQ(*evt)) {
Sample::TitleR(evt, "TextBox");
return true;
return this->INHERITED::onQuery(evt);
void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
SkAutoCanvasRestore acr(canvas, true);
canvas->clipRect(SkRect::MakeWH(w, h));
SkShaper shaper(nullptr);
SkScalar margin = 20;
SkPaint paint;
for (int i = 9; i < 24; i += 2) {
SkTextBlobBuilderRunHandler builder;
SkFont font(nullptr, SkIntToScalar(i));
SkPoint end = shaper.shape(&builder, font, gText, strlen(gText), true,
{ margin, margin }, w - margin);
canvas->drawTextBlob(builder.makeBlob(), 0, 0, paint);
canvas->translate(0, end.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);
typedef Sample INHERITED;
DEF_SAMPLE( return new TextBoxView(); )