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1 /*
2  * Copyright 2014 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 
10 #include "SkCanvas.h"
11 #include "SkGradientShader.h"
12 #include "SkPoint.h"
13 #include "SkShader.h"
14 #include "SkTextBlob.h"
15 #include "SkTDArray.h"
16 #include "SkTypeface.h"
17 
18 // This GM exercises drawTextBlob offset vs. shader space behavior.
19 class TextBlobShaderGM : public skiagm::GM {
20 public:
TextBlobShaderGM(const char * txt)21     TextBlobShaderGM(const char* txt) {
22         SkPaint p;
23         sk_tool_utils::set_portable_typeface(&p);
24         size_t txtLen = strlen(txt);
25         fGlyphs.append(p.textToGlyphs(txt, txtLen, nullptr));
26         p.textToGlyphs(txt, txtLen, fGlyphs.begin());
27     }
28 
29 protected:
30 
onOnceBeforeDraw()31     void onOnceBeforeDraw() override {
32         SkPaint p;
33         p.setAntiAlias(true);
34         p.setSubpixelText(true);
35         p.setTextSize(30);
36         p.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
37         sk_tool_utils::set_portable_typeface(&p);
38 
39         SkTextBlobBuilder builder;
40         int glyphCount = fGlyphs.count();
41         const SkTextBlobBuilder::RunBuffer* run;
42 
43         run = &builder.allocRun(p, glyphCount, 10, 10, nullptr);
44         memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
45 
46         run = &builder.allocRunPosH(p, glyphCount,  80, nullptr);
47         memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
48         for (int i = 0; i < glyphCount; ++i) {
49             run->pos[i] = p.getTextSize() * i * .75f;
50         }
51 
52         run = &builder.allocRunPos(p, glyphCount, nullptr);
53         memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
54         for (int i = 0; i < glyphCount; ++i) {
55             run->pos[i * 2] = p.getTextSize() * i * .75f;
56             run->pos[i * 2 + 1] = 150 + 5 * sinf((float)i * 8 / glyphCount);
57         }
58 
59         fBlob.reset(builder.build());
60 
61         SkColor  colors[2];
62         colors[0] = SK_ColorRED;
63         colors[1] = SK_ColorGREEN;
64 
65         SkScalar pos[SK_ARRAY_COUNT(colors)];
66         for (unsigned i = 0; i < SK_ARRAY_COUNT(pos); ++i) {
67             pos[i] = (float)i / (SK_ARRAY_COUNT(pos) - 1);
68         }
69 
70         SkISize sz = this->onISize();
71         fShader.reset(SkGradientShader::CreateRadial(SkPoint::Make(SkIntToScalar(sz.width() / 2),
72                                                                    SkIntToScalar(sz.height() / 2)),
73                                                      sz.width() * .66f, colors, pos,
74                                                      SK_ARRAY_COUNT(colors),
75                                                      SkShader::kRepeat_TileMode));
76     }
77 
onShortName()78     SkString onShortName() override {
79         return SkString("textblobshader");
80     }
81 
onISize()82     SkISize onISize() override {
83         return SkISize::Make(640, 480);
84     }
85 
onDraw(SkCanvas * canvas)86     void onDraw(SkCanvas* canvas) override {
87         SkPaint p;
88         p.setStyle(SkPaint::kFill_Style);
89         p.setShader(fShader);
90 
91         SkISize sz = this->onISize();
92         static const int kXCount = 4;
93         static const int kYCount = 3;
94         for (int i = 0; i < kXCount; ++i) {
95             for (int j = 0; j < kYCount; ++j) {
96                 canvas->drawTextBlob(fBlob,
97                                      SkIntToScalar(i * sz.width() / kXCount),
98                                      SkIntToScalar(j * sz.height() / kYCount),
99                                      p);
100             }
101         }
102     }
103 
104 private:
105     SkTDArray<uint16_t>            fGlyphs;
106     SkAutoTUnref<const SkTextBlob> fBlob;
107     SkAutoTUnref<SkShader>         fShader;
108 
109     typedef skiagm::GM INHERITED;
110 };
111 
112 DEF_GM(return new TextBlobShaderGM("Blobber");)
113