1 /*
2 * Copyright 2011 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 #include "SampleCode.h"
8
9 #include "SkBlurMaskFilter.h"
10 #include "SkCanvas.h"
11 #include "SkColorFilter.h"
12 #include "SkColorPriv.h"
13 #include "SkColorShader.h"
14 #include "SkGradientShader.h"
15 #include "SkGraphics.h"
16 #include "SkOSFile.h"
17 #include "SkPath.h"
18 #include "SkRandom.h"
19 #include "SkRegion.h"
20 #include "SkShader.h"
21 #include "SkShaper.h"
22 #include "SkStream.h"
23 #include "SkTextBlob.h"
24 #include "SkTime.h"
25 #include "SkTypeface.h"
26 #include "SkUtils.h"
27 #include "SkView.h"
28
29 extern void skia_set_text_gamma(float blackGamma, float whiteGamma);
30
31 #if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
32 extern SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT&);
33 #endif
34
35 static const char gText[] =
36 "When in the Course of human events it becomes necessary for one people "
37 "to dissolve the political bands which have connected them with another "
38 "and to assume among the powers of the earth, the separate and equal "
39 "station to which the Laws of Nature and of Nature's God entitle them, "
40 "a decent respect to the opinions of mankind requires that they should "
41 "declare the causes which impel them to the separation.";
42
43 class TextBoxView : public SampleView {
44 public:
TextBoxView()45 TextBoxView() {
46 #if defined(SK_BUILD_FOR_WIN) && defined(SK_FONTHOST_WIN_GDI)
47 LOGFONT lf;
48 sk_bzero(&lf, sizeof(lf));
49 lf.lfHeight = 9;
50 SkTypeface* tf0 = SkCreateTypefaceFromLOGFONT(lf);
51 lf.lfHeight = 12;
52 SkTypeface* tf1 = SkCreateTypefaceFromLOGFONT(lf);
53 // we assert that different sizes should not affect which face we get
54 SkASSERT(tf0 == tf1);
55 tf0->unref();
56 tf1->unref();
57 #endif
58 }
59
60 protected:
61 // overrides from SkEventSink
onQuery(SkEvent * evt)62 bool onQuery(SkEvent* evt) override {
63 if (SampleCode::TitleQ(*evt)) {
64 SampleCode::TitleR(evt, "TextBox");
65 return true;
66 }
67 return this->INHERITED::onQuery(evt);
68 }
69
drawTest(SkCanvas * canvas,SkScalar w,SkScalar h,SkColor fg,SkColor bg)70 void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg) {
71 SkAutoCanvasRestore acr(canvas, true);
72
73 canvas->clipRect(SkRect::MakeWH(w, h));
74 canvas->drawColor(bg);
75
76 SkShaper shaper(nullptr);
77
78 SkScalar margin = 20;
79
80 SkPaint paint;
81 paint.setAntiAlias(true);
82 paint.setLCDRenderText(true);
83 paint.setColor(fg);
84
85 for (int i = 9; i < 24; i += 2) {
86 SkTextBlobBuilder builder;
87 paint.setTextSize(SkIntToScalar(i));
88 SkPoint end = shaper.shape(&builder, paint, gText, strlen(gText), true,
89 { margin, margin }, w - margin);
90 canvas->drawTextBlob(builder.make(), 0, 0, paint);
91
92 canvas->translate(0, end.y());
93 }
94 }
95
onDrawContent(SkCanvas * canvas)96 void onDrawContent(SkCanvas* canvas) override {
97 SkScalar width = this->width() / 3;
98 drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
99 canvas->translate(width, 0);
100 drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
101 canvas->translate(width, 0);
102 drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
103 canvas->translate(0, this->height()/2);
104 drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
105 }
106
107 private:
108 typedef SampleView INHERITED;
109 };
110
111 //////////////////////////////////////////////////////////////////////////////
112
MyFactory()113 static SkView* MyFactory() { return new TextBoxView; }
114 static SkViewRegister reg(MyFactory);
115