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 "SkPaint.h"
9 #include "SkPoint.h"
10 #include "SkTextBlob.h"
11
12 #include "Test.h"
13
14
15 class TextBlobTester {
16 public:
17 // This unit test feeds an SkTextBlobBuilder various runs then checks to see if
18 // the result contains the provided data and merges runs when appropriate.
TestBuilder(skiatest::Reporter * reporter)19 static void TestBuilder(skiatest::Reporter* reporter) {
20 SkTextBlobBuilder builder;
21
22 // empty run set
23 RunBuilderTest(reporter, builder, NULL, 0, NULL, 0);
24
25 RunDef set1[] = {
26 { 128, SkTextBlob::kDefault_Positioning, 100, 100 },
27 };
28 RunBuilderTest(reporter, builder, set1, SK_ARRAY_COUNT(set1), set1, SK_ARRAY_COUNT(set1));
29
30 RunDef set2[] = {
31 { 128, SkTextBlob::kHorizontal_Positioning, 100, 100 },
32 };
33 RunBuilderTest(reporter, builder, set2, SK_ARRAY_COUNT(set2), set2, SK_ARRAY_COUNT(set2));
34
35 RunDef set3[] = {
36 { 128, SkTextBlob::kFull_Positioning, 100, 100 },
37 };
38 RunBuilderTest(reporter, builder, set3, SK_ARRAY_COUNT(set3), set3, SK_ARRAY_COUNT(set3));
39
40 RunDef set4[] = {
41 { 128, SkTextBlob::kDefault_Positioning, 100, 150 },
42 { 128, SkTextBlob::kDefault_Positioning, 100, 150 },
43 { 128, SkTextBlob::kDefault_Positioning, 100, 150 },
44 };
45 RunBuilderTest(reporter, builder, set4, SK_ARRAY_COUNT(set4), set4, SK_ARRAY_COUNT(set4));
46
47 RunDef set5[] = {
48 { 128, SkTextBlob::kHorizontal_Positioning, 100, 150 },
49 { 128, SkTextBlob::kHorizontal_Positioning, 200, 150 },
50 { 128, SkTextBlob::kHorizontal_Positioning, 300, 250 },
51 };
52 RunDef mergedSet5[] = {
53 { 256, SkTextBlob::kHorizontal_Positioning, 0, 150 },
54 { 128, SkTextBlob::kHorizontal_Positioning, 0, 250 },
55 };
56 RunBuilderTest(reporter, builder, set5, SK_ARRAY_COUNT(set5), mergedSet5,
57 SK_ARRAY_COUNT(mergedSet5));
58
59 RunDef set6[] = {
60 { 128, SkTextBlob::kFull_Positioning, 100, 100 },
61 { 128, SkTextBlob::kFull_Positioning, 200, 200 },
62 { 128, SkTextBlob::kFull_Positioning, 300, 300 },
63 };
64 RunDef mergedSet6[] = {
65 { 384, SkTextBlob::kFull_Positioning, 0, 0 },
66 };
67 RunBuilderTest(reporter, builder, set6, SK_ARRAY_COUNT(set6), mergedSet6,
68 SK_ARRAY_COUNT(mergedSet6));
69
70 RunDef set7[] = {
71 { 128, SkTextBlob::kDefault_Positioning, 100, 150 },
72 { 128, SkTextBlob::kDefault_Positioning, 100, 150 },
73 { 128, SkTextBlob::kHorizontal_Positioning, 100, 150 },
74 { 128, SkTextBlob::kHorizontal_Positioning, 200, 150 },
75 { 128, SkTextBlob::kFull_Positioning, 400, 350 },
76 { 128, SkTextBlob::kFull_Positioning, 400, 350 },
77 { 128, SkTextBlob::kDefault_Positioning, 100, 450 },
78 { 128, SkTextBlob::kDefault_Positioning, 100, 450 },
79 { 128, SkTextBlob::kHorizontal_Positioning, 100, 550 },
80 { 128, SkTextBlob::kHorizontal_Positioning, 200, 650 },
81 { 128, SkTextBlob::kFull_Positioning, 400, 750 },
82 { 128, SkTextBlob::kFull_Positioning, 400, 850 },
83 };
84 RunDef mergedSet7[] = {
85 { 128, SkTextBlob::kDefault_Positioning, 100, 150 },
86 { 128, SkTextBlob::kDefault_Positioning, 100, 150 },
87 { 256, SkTextBlob::kHorizontal_Positioning, 0, 150 },
88 { 256, SkTextBlob::kFull_Positioning, 0, 0 },
89 { 128, SkTextBlob::kDefault_Positioning, 100, 450 },
90 { 128, SkTextBlob::kDefault_Positioning, 100, 450 },
91 { 128, SkTextBlob::kHorizontal_Positioning, 0, 550 },
92 { 128, SkTextBlob::kHorizontal_Positioning, 0, 650 },
93 { 256, SkTextBlob::kFull_Positioning, 0, 0 },
94 };
95 RunBuilderTest(reporter, builder, set7, SK_ARRAY_COUNT(set7), mergedSet7,
96 SK_ARRAY_COUNT(mergedSet7));
97 }
98
99 // This unit test verifies blob bounds computation.
TestBounds(skiatest::Reporter * reporter)100 static void TestBounds(skiatest::Reporter* reporter) {
101 SkTextBlobBuilder builder;
102 SkPaint font;
103 font.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
104
105 // Explicit bounds.
106 {
107 SkAutoTUnref<const SkTextBlob> blob(builder.build());
108 REPORTER_ASSERT(reporter, blob->bounds().isEmpty());
109 }
110
111 {
112 SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
113 builder.allocRun(font, 16, 0, 0, &r1);
114 SkAutoTUnref<const SkTextBlob> blob(builder.build());
115 REPORTER_ASSERT(reporter, blob->bounds() == r1);
116 }
117
118 {
119 SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
120 builder.allocRunPosH(font, 16, 0, &r1);
121 SkAutoTUnref<const SkTextBlob> blob(builder.build());
122 REPORTER_ASSERT(reporter, blob->bounds() == r1);
123 }
124
125 {
126 SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
127 builder.allocRunPos(font, 16, &r1);
128 SkAutoTUnref<const SkTextBlob> blob(builder.build());
129 REPORTER_ASSERT(reporter, blob->bounds() == r1);
130 }
131
132 {
133 SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
134 SkRect r2 = SkRect::MakeXYWH(15, 20, 50, 50);
135 SkRect r3 = SkRect::MakeXYWH(0, 5, 10, 5);
136
137 builder.allocRun(font, 16, 0, 0, &r1);
138 builder.allocRunPosH(font, 16, 0, &r2);
139 builder.allocRunPos(font, 16, &r3);
140
141 SkAutoTUnref<const SkTextBlob> blob(builder.build());
142 REPORTER_ASSERT(reporter, blob->bounds() == SkRect::MakeXYWH(0, 5, 65, 65));
143 }
144
145 {
146 // Verify empty blob bounds after building some non-empty blobs.
147 SkAutoTUnref<const SkTextBlob> blob(builder.build());
148 REPORTER_ASSERT(reporter, blob->bounds().isEmpty());
149 }
150
151 // Implicit bounds
152 // FIXME: not supported yet.
153 }
154
155 private:
156 struct RunDef {
157 unsigned count;
158 SkTextBlob::GlyphPositioning pos;
159 SkScalar x, y;
160 };
161
RunBuilderTest(skiatest::Reporter * reporter,SkTextBlobBuilder & builder,const RunDef in[],unsigned inCount,const RunDef out[],unsigned outCount)162 static void RunBuilderTest(skiatest::Reporter* reporter, SkTextBlobBuilder& builder,
163 const RunDef in[], unsigned inCount,
164 const RunDef out[], unsigned outCount) {
165 SkPaint font;
166 font.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
167
168 unsigned glyphCount = 0;
169 unsigned posCount = 0;
170
171 for (unsigned i = 0; i < inCount; ++i) {
172 AddRun(font, in[i].count, in[i].pos, SkPoint::Make(in[i].x, in[i].y), builder);
173 glyphCount += in[i].count;
174 posCount += in[i].count * in[i].pos;
175 }
176
177 SkAutoTUnref<const SkTextBlob> blob(builder.build());
178
179 SkTextBlob::RunIterator it(blob);
180 for (unsigned i = 0; i < outCount; ++i) {
181 REPORTER_ASSERT(reporter, !it.done());
182 REPORTER_ASSERT(reporter, out[i].pos == it.positioning());
183 REPORTER_ASSERT(reporter, out[i].count == it.glyphCount());
184 if (SkTextBlob::kDefault_Positioning == out[i].pos) {
185 REPORTER_ASSERT(reporter, out[i].x == it.offset().x());
186 REPORTER_ASSERT(reporter, out[i].y == it.offset().y());
187 } else if (SkTextBlob::kHorizontal_Positioning == out[i].pos) {
188 REPORTER_ASSERT(reporter, out[i].y == it.offset().y());
189 }
190
191 for (unsigned k = 0; k < it.glyphCount(); ++k) {
192 REPORTER_ASSERT(reporter, k % 128 == it.glyphs()[k]);
193 if (SkTextBlob::kHorizontal_Positioning == it.positioning()) {
194 REPORTER_ASSERT(reporter, SkIntToScalar(k % 128) == it.pos()[k]);
195 } else if (SkTextBlob::kFull_Positioning == it.positioning()) {
196 REPORTER_ASSERT(reporter, SkIntToScalar(k % 128) == it.pos()[k * 2]);
197 REPORTER_ASSERT(reporter, -SkIntToScalar(k % 128) == it.pos()[k * 2 + 1]);
198 }
199 }
200
201 it.next();
202 }
203
204 REPORTER_ASSERT(reporter, it.done());
205 }
206
AddRun(const SkPaint & font,int count,SkTextBlob::GlyphPositioning pos,const SkPoint & offset,SkTextBlobBuilder & builder,const SkRect * bounds=NULL)207 static void AddRun(const SkPaint& font, int count, SkTextBlob::GlyphPositioning pos,
208 const SkPoint& offset, SkTextBlobBuilder& builder,
209 const SkRect* bounds = NULL) {
210 switch (pos) {
211 case SkTextBlob::kDefault_Positioning: {
212 const SkTextBlobBuilder::RunBuffer& rb = builder.allocRun(font, count, offset.x(),
213 offset.y(), bounds);
214 for (int i = 0; i < count; ++i) {
215 rb.glyphs[i] = i;
216 }
217 } break;
218 case SkTextBlob::kHorizontal_Positioning: {
219 const SkTextBlobBuilder::RunBuffer& rb = builder.allocRunPosH(font, count, offset.y(),
220 bounds);
221 for (int i = 0; i < count; ++i) {
222 rb.glyphs[i] = i;
223 rb.pos[i] = SkIntToScalar(i);
224 }
225 } break;
226 case SkTextBlob::kFull_Positioning: {
227 const SkTextBlobBuilder::RunBuffer& rb = builder.allocRunPos(font, count, bounds);
228 for (int i = 0; i < count; ++i) {
229 rb.glyphs[i] = i;
230 rb.pos[i * 2] = SkIntToScalar(i);
231 rb.pos[i * 2 + 1] = -SkIntToScalar(i);
232 }
233 } break;
234 default:
235 SkFAIL("unhandled positioning value");
236 }
237 }
238 };
239
DEF_TEST(TextBlob_builder,reporter)240 DEF_TEST(TextBlob_builder, reporter) {
241 TextBlobTester::TestBuilder(reporter);
242 TextBlobTester::TestBounds(reporter);
243 }
244