1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.graphics;
18
19import android.graphics.Paint;
20import android.test.InstrumentationTestCase;
21import android.test.suitebuilder.annotation.SmallTest;
22
23import java.util.Arrays;
24import java.util.HashSet;
25
26/**
27 * PaintTest tests {@link Paint}.
28 */
29public class PaintTest extends InstrumentationTestCase {
30    private static final String FONT_PATH = "fonts/HintedAdvanceWidthTest-Regular.ttf";
31
32    static void assertEquals(String message, float[] expected, float[] actual) {
33        if (expected.length != actual.length) {
34            fail(message + " expected array length:<" + expected.length + "> but was:<"
35                    + actual.length + ">");
36        }
37        for (int i = 0; i < expected.length; ++i) {
38            if (expected[i] != actual[i]) {
39                fail(message + " expected array element[" +i + "]:<" + expected[i] + ">but was:<"
40                        + actual[i] + ">");
41            }
42        }
43    }
44
45    static class HintingTestCase {
46        public final String mText;
47        public final float mTextSize;
48        public final float[] mWidthWithoutHinting;
49        public final float[] mWidthWithHinting;
50
51        public HintingTestCase(String text, float textSize, float[] widthWithoutHinting,
52                               float[] widthWithHinting) {
53            mText = text;
54            mTextSize = textSize;
55            mWidthWithoutHinting = widthWithoutHinting;
56            mWidthWithHinting = widthWithHinting;
57        }
58    }
59
60    // Following test cases are only valid for HintedAdvanceWidthTest-Regular.ttf in assets/fonts.
61    HintingTestCase[] HINTING_TESTCASES = {
62        new HintingTestCase("H", 11f, new float[] { 7f }, new float[] { 13f }),
63        new HintingTestCase("O", 11f, new float[] { 7f }, new float[] { 13f }),
64
65        new HintingTestCase("H", 13f, new float[] { 8f }, new float[] { 14f }),
66        new HintingTestCase("O", 13f, new float[] { 9f }, new float[] { 15f }),
67
68        new HintingTestCase("HO", 11f, new float[] { 7f, 7f }, new float[] { 13f, 13f }),
69        new HintingTestCase("OH", 11f, new float[] { 7f, 7f }, new float[] { 13f, 13f }),
70
71        new HintingTestCase("HO", 13f, new float[] { 8f, 9f }, new float[] { 14f, 15f }),
72        new HintingTestCase("OH", 13f, new float[] { 9f, 8f }, new float[] { 15f, 14f }),
73    };
74
75    @SmallTest
76    public void testHintingWidth() {
77        final Typeface fontTypeface = Typeface.createFromAsset(
78                getInstrumentation().getContext().getAssets(), FONT_PATH);
79        Paint paint = new Paint();
80        paint.setTypeface(fontTypeface);
81
82        for (int i = 0; i < HINTING_TESTCASES.length; ++i) {
83            HintingTestCase testCase = HINTING_TESTCASES[i];
84
85            paint.setTextSize(testCase.mTextSize);
86
87            float[] widths = new float[testCase.mText.length()];
88
89            paint.setHinting(Paint.HINTING_OFF);
90            paint.getTextWidths(String.valueOf(testCase.mText), widths);
91            assertEquals("Text width of '" + testCase.mText + "' without hinting is not expected.",
92                    testCase.mWidthWithoutHinting, widths);
93
94            paint.setHinting(Paint.HINTING_ON);
95            paint.getTextWidths(String.valueOf(testCase.mText), widths);
96            assertEquals("Text width of '" + testCase.mText + "' with hinting is not expected.",
97                    testCase.mWidthWithHinting, widths);
98        }
99    }
100
101    private static class HasGlyphTestCase {
102        public final int mBaseCodepoint;
103        public final HashSet<Integer> mVariationSelectors;
104
105        public HasGlyphTestCase(int baseCodepoint, Integer[] variationSelectors) {
106            mBaseCodepoint = baseCodepoint;
107            mVariationSelectors = new HashSet<>(Arrays.asList(variationSelectors));
108        }
109    }
110
111    private static String codePointsToString(int[] codepoints) {
112        StringBuilder sb = new StringBuilder();
113        for (int codepoint : codepoints) {
114            sb.append(Character.toChars(codepoint));
115        }
116        return sb.toString();
117    }
118
119    public void testHasGlyph_variationSelectors() {
120        final Typeface fontTypeface = Typeface.createFromAsset(
121                getInstrumentation().getContext().getAssets(), "fonts/hasGlyphTestFont.ttf");
122        Paint p = new Paint();
123        p.setTypeface(fontTypeface);
124
125        // Usually latin letters U+0061..U+0064 and Mahjong Tiles U+1F000..U+1F003 don't have
126        // variation selectors.  This test may fail if system pre-installed fonts have a variation
127        // selector support for U+0061..U+0064 and U+1F000..U+1F003.
128        HasGlyphTestCase[] HAS_GLYPH_TEST_CASES = {
129            new HasGlyphTestCase(0x0061, new Integer[] {0xFE00, 0xE0100, 0xE0101, 0xE0102}),
130            new HasGlyphTestCase(0x0062, new Integer[] {0xFE01, 0xE0101, 0xE0102, 0xE0103}),
131            new HasGlyphTestCase(0x0063, new Integer[] {}),
132            new HasGlyphTestCase(0x0064, new Integer[] {0xFE02, 0xE0102, 0xE0103}),
133
134            new HasGlyphTestCase(0x1F000, new Integer[] {0xFE00, 0xE0100, 0xE0101, 0xE0102}),
135            new HasGlyphTestCase(0x1F001, new Integer[] {0xFE01, 0xE0101, 0xE0102, 0xE0103}),
136            new HasGlyphTestCase(0x1F002, new Integer[] {}),
137            new HasGlyphTestCase(0x1F003, new Integer[] {0xFE02, 0xE0102, 0xE0103}),
138        };
139
140        for (HasGlyphTestCase testCase : HAS_GLYPH_TEST_CASES) {
141            for (int vs = 0xFE00; vs <= 0xE01EF; ++vs) {
142                // Move to variation selector supplements after variation selectors.
143                if (vs == 0xFF00) {
144                    vs = 0xE0100;
145                }
146                final String signature =
147                        "hasGlyph(U+" + Integer.toHexString(testCase.mBaseCodepoint) +
148                        " U+" + Integer.toHexString(vs) + ")";
149                final String testString =
150                        codePointsToString(new int[] {testCase.mBaseCodepoint, vs});
151                if (testCase.mVariationSelectors.contains(vs)) {
152                    assertTrue(signature + " is expected to be true", p.hasGlyph(testString));
153                } else {
154                    assertFalse(signature + " is expected to be false", p.hasGlyph(testString));
155                }
156            }
157        }
158    }
159}
160