1/*
2 * Copyright 2015 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 "gm.h"
9#include "sk_tool_utils.h"
10
11#include "Resources.h"
12#include "SkCanvas.h"
13#include "SkGradientShader.h"
14#include "SkStream.h"
15#include "SkTextBlob.h"
16#include "SkTypeface.h"
17
18namespace skiagm {
19class TextBlobTransforms : public GM {
20public:
21    // This gm tests that textblobs can be translated, rotated, and scaled
22    TextBlobTransforms() {}
23
24protected:
25    void onOnceBeforeDraw() override {
26        SkTextBlobBuilder builder;
27
28        // make textblob.  To stress distance fields, we choose sizes appropriately
29        SkPaint paint;
30        paint.setTextSize(162);
31        const char* text = "A";
32        sk_tool_utils::set_portable_typeface(&paint);
33
34        SkRect bounds;
35        paint.measureText(text, strlen(text), &bounds);
36        sk_tool_utils::add_to_text_blob(&builder, text, paint, 0, 0);
37
38        // Medium
39        SkScalar xOffset = bounds.width() + 5;
40        paint.setTextSize(72);
41        text = "B";
42        sk_tool_utils::add_to_text_blob(&builder, text, paint, xOffset, 0);
43
44        paint.measureText(text, strlen(text), &bounds);
45        SkScalar yOffset = bounds.height();
46
47        // Small
48        paint.setTextSize(32);
49        text = "C";
50        sk_tool_utils::add_to_text_blob(&builder, text, paint, xOffset, -yOffset - 10);
51
52        // build
53        fBlob = builder.make();
54    }
55
56    SkString onShortName() override {
57        return SkString("textblobtransforms");
58    }
59
60    SkISize onISize() override {
61        return SkISize::Make(kWidth, kHeight);
62    }
63
64    void onDraw(SkCanvas* canvas) override {
65
66        canvas->drawColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
67
68        SkPaint paint;
69
70        SkRect bounds = fBlob->bounds();
71        canvas->translate(20, 20);
72
73        // Colors were chosen to map to pairs of canonical colors.  The GPU Backend will cache A8
74        // Texture Blobs based on the canonical color they map to.  Canonical colors are used to
75        // create masks.  For A8 there are 8 of them.
76        //SkColor colors[] = {SK_ColorCYAN, sk_tool_utils::color_to_565(SK_ColorLTGRAY), SK_ColorYELLOW, SK_ColorWHITE};
77
78        SkScalar xOffset = SkScalarCeilToScalar(bounds.width());
79        SkScalar yOffset = SkScalarCeilToScalar(bounds.height());
80        // first translate
81        canvas->translate(xOffset, 2 * yOffset);
82        canvas->drawTextBlob(fBlob, 0, 0, paint);
83        canvas->translate(-xOffset, 0);
84        canvas->drawTextBlob(fBlob, 0, 0, paint);
85        canvas->translate(2 * xOffset, 0);
86        canvas->drawTextBlob(fBlob, 0, 0, paint);
87        canvas->translate(-xOffset, -yOffset);
88        canvas->drawTextBlob(fBlob, 0, 0, paint);
89        canvas->translate(0, 2 * yOffset);
90        canvas->drawTextBlob(fBlob, 0, 0, paint);
91
92        // now rotate
93        canvas->translate(4 * xOffset, -yOffset);
94        canvas->rotate(180.f);
95        canvas->drawTextBlob(fBlob, 0, 0, paint);
96        canvas->rotate(-180.f);
97        canvas->translate(0, -yOffset);
98        canvas->rotate(-180.f);
99        canvas->drawTextBlob(fBlob, 0, 0, paint);
100        canvas->rotate(270.f);
101        canvas->drawTextBlob(fBlob, 0, 0, paint);
102        canvas->rotate(-90.f);
103        canvas->translate(-xOffset, yOffset);
104        canvas->rotate(-90.f);
105        canvas->drawTextBlob(fBlob, 0, 0, paint);
106        canvas->rotate(90.f);
107
108        // and scales
109        canvas->translate(- 3 * xOffset, 3 * yOffset);
110        canvas->scale(1.5f, 1.5f);
111        canvas->drawTextBlob(fBlob, 0, 0, paint);
112        canvas->translate(xOffset, 0);
113        canvas->scale(.25f, .25f);
114        canvas->drawTextBlob(fBlob, 0, 0, paint);
115        canvas->translate(xOffset, 0);
116        canvas->scale(3.f, 2.f);
117        canvas->drawTextBlob(fBlob, 0, 0, paint);
118
119        // finally rotates, scales, and translates together
120        canvas->translate(xOffset, 0);
121        canvas->rotate(23.f);
122        canvas->scale(.33f, .5f);
123        canvas->drawTextBlob(fBlob, 0, 0, paint);
124
125        canvas->rotate(-46.f);
126        canvas->translate(xOffset, 0);
127        canvas->scale(1.2f, 1.1f);
128        canvas->drawTextBlob(fBlob, 0, 0, paint);
129
130        canvas->rotate(46.f);
131        canvas->translate(xOffset, 0);
132        canvas->scale(1.1f, 1.2f);
133        canvas->drawTextBlob(fBlob, 0, 0, paint);
134
135        canvas->rotate(46.f);
136        canvas->translate(xOffset, 0);
137        canvas->scale(.95f, 1.1f);
138        canvas->drawTextBlob(fBlob, 0, 0, paint);
139
140        canvas->rotate(46.f);
141        canvas->translate(xOffset, 0);
142        canvas->scale(1.3f, .7f);
143        canvas->drawTextBlob(fBlob, 0, 0, paint);
144
145        canvas->rotate(46.f);
146        canvas->translate(xOffset, 0);
147        canvas->scale(.8f, 1.1f);
148        canvas->drawTextBlob(fBlob, 0, 0, paint);
149
150        canvas->rotate(10.f);
151        canvas->translate(xOffset, 0);
152        canvas->scale(1.f, 5.f);
153        canvas->drawTextBlob(fBlob, 0, 0, paint);
154
155        canvas->rotate(5.f);
156        canvas->translate(xOffset, 0);
157        canvas->scale(5.f, 1.f);
158        canvas->drawTextBlob(fBlob, 0, 0, paint);
159    }
160
161private:
162    sk_sp<SkTextBlob> fBlob;
163
164    static constexpr int kWidth = 1000;
165    static constexpr int kHeight = 1200;
166
167    typedef GM INHERITED;
168};
169
170//////////////////////////////////////////////////////////////////////////////
171
172DEF_GM(return new TextBlobTransforms;)
173}
174