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fmalita84833262014-09-19 11:40:51 -07001/*
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.
19class TextBlobShaderGM : public skiagm::GM {
20public:
21 TextBlobShaderGM(const char* txt) {
22 SkPaint p;
caryclarkefa1ece2015-07-28 11:55:49 -070023 sk_tool_utils::set_portable_typeface(&p);
fmalita84833262014-09-19 11:40:51 -070024 size_t txtLen = strlen(txt);
halcanary96fcdcc2015-08-27 07:41:13 -070025 fGlyphs.append(p.textToGlyphs(txt, txtLen, nullptr));
fmalita84833262014-09-19 11:40:51 -070026 p.textToGlyphs(txt, txtLen, fGlyphs.begin());
27 }
28
29protected:
30
mtklein36352bf2015-03-25 18:17:31 -070031 void onOnceBeforeDraw() override {
fmalita84833262014-09-19 11:40:51 -070032 SkPaint p;
33 p.setAntiAlias(true);
34 p.setSubpixelText(true);
35 p.setTextSize(30);
36 p.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
caryclarkf597c422015-07-28 10:37:53 -070037 sk_tool_utils::set_portable_typeface(&p);
fmalita84833262014-09-19 11:40:51 -070038
39 SkTextBlobBuilder builder;
40 int glyphCount = fGlyphs.count();
41 const SkTextBlobBuilder::RunBuffer* run;
42
halcanary96fcdcc2015-08-27 07:41:13 -070043 run = &builder.allocRun(p, glyphCount, 10, 10, nullptr);
fmalita84833262014-09-19 11:40:51 -070044 memcpy(run->glyphs, fGlyphs.begin(), glyphCount * sizeof(uint16_t));
45
halcanary96fcdcc2015-08-27 07:41:13 -070046 run = &builder.allocRunPosH(p, glyphCount, 80, nullptr);
fmalita84833262014-09-19 11:40:51 -070047 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
halcanary96fcdcc2015-08-27 07:41:13 -070052 run = &builder.allocRunPos(p, glyphCount, nullptr);
fmalita84833262014-09-19 11:40:51 -070053 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();
reed1a9b9642016-03-13 14:13:58 -070071 fShader = SkGradientShader::MakeRadial(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);
fmalita84833262014-09-19 11:40:51 -070076 }
77
mtklein36352bf2015-03-25 18:17:31 -070078 SkString onShortName() override {
fmalita84833262014-09-19 11:40:51 -070079 return SkString("textblobshader");
80 }
81
mtklein36352bf2015-03-25 18:17:31 -070082 SkISize onISize() override {
fmalita84833262014-09-19 11:40:51 -070083 return SkISize::Make(640, 480);
84 }
85
mtklein36352bf2015-03-25 18:17:31 -070086 void onDraw(SkCanvas* canvas) override {
fmalita84833262014-09-19 11:40:51 -070087 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
104private:
105 SkTDArray<uint16_t> fGlyphs;
106 SkAutoTUnref<const SkTextBlob> fBlob;
reed1a9b9642016-03-13 14:13:58 -0700107 sk_sp<SkShader> fShader;
fmalita84833262014-09-19 11:40:51 -0700108
109 typedef skiagm::GM INHERITED;
110};
111
halcanary385fe4d2015-08-26 13:07:48 -0700112DEF_GM(return new TextBlobShaderGM("Blobber");)