Merge "Add tests for Paint#getTextRunAdvances"

1 files changed, 165 insertions, 0 deletions

diff --git a/graphics/tests/graphicstests/src/android/graphics/PaintTest.java b/graphics/tests/graphicstests/src/android/graphics/PaintTest.java
new file mode 100644
index 000000000000..b67aa7dca17b
--- /dev/null
+++ b/graphics/tests/graphicstests/src/android/graphics/PaintTest.java
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.graphics;
+
+import android.test.AndroidTestCase;
+
+public class PaintTest extends AndroidTestCase {
+    public void testGetTextRunAdvances() {
+        {
+            // LTR
+            String text = "abcdef";
+            assertGetTextRunAdvances(text, 0, text.length(), 0, text.length(), false, true);
+            assertGetTextRunAdvances(text, 1, text.length() - 1, 0, text.length(), false, false);
+        }
+        {
+            // RTL
+            final String text =
+                    "\u0645\u0627\u0020\u0647\u064A\u0020\u0627\u0644\u0634" +
+                    "\u0641\u0631\u0629\u0020\u0627\u0644\u0645\u0648\u062D" +
+                    "\u062F\u0629\u0020\u064A\u0648\u0646\u064A\u0643\u0648" +
+                    "\u062F\u061F";
+            assertGetTextRunAdvances(text, 0, text.length(), 0, text.length(), true, true);
+            assertGetTextRunAdvances(text, 1, text.length() - 1, 0, text.length(), true, false);
+        }
+    }
+
+    private void assertGetTextRunAdvances(String str, int start, int end,
+            int contextStart, int contextEnd, boolean isRtl, boolean compareWithOtherMethods) {
+        Paint p = new Paint();
+
+        final int count = end - start;
+        final float[][] advanceArrays = new float[4][count];
+
+        final float advance = p.getTextRunAdvances(str, start, end, contextStart, contextEnd,
+                isRtl, advanceArrays[0], 0);
+
+        char chars[] = str.toCharArray();
+        final float advance_c = p.getTextRunAdvances(chars, start, count, contextStart,
+                contextEnd - contextStart, isRtl, advanceArrays[1], 0);
+        assertEquals(advance, advance_c, 1.0f);
+
+        for (int c = 1; c < count; ++c) {
+            final float firstPartAdvance = p.getTextRunAdvances(str, start, start + c,
+                    contextStart, contextEnd, isRtl, advanceArrays[2], 0);
+            final float secondPartAdvance = p.getTextRunAdvances(str, start + c, end,
+                    contextStart, contextEnd, isRtl, advanceArrays[2], c);
+            assertEquals(advance, firstPartAdvance + secondPartAdvance, 1.0f);
+
+
+            final float firstPartAdvance_c = p.getTextRunAdvances(chars, start, c,
+                    contextStart, contextEnd - contextStart, isRtl, advanceArrays[3], 0);
+            final float secondPartAdvance_c = p.getTextRunAdvances(chars, start + c,
+                    count - c, contextStart, contextEnd - contextStart, isRtl,
+                    advanceArrays[3], c);
+            assertEquals(advance, firstPartAdvance_c + secondPartAdvance_c, 1.0f);
+            assertEquals(firstPartAdvance, firstPartAdvance_c, 1.0f);
+            assertEquals(secondPartAdvance, secondPartAdvance_c, 1.0f);
+
+            for (int i = 1; i < advanceArrays.length; i++) {
+                for (int j = 0; j < count; j++) {
+                    assertEquals(advanceArrays[0][j], advanceArrays[i][j], 1.0f);
+                }
+            }
+
+            // Compare results with measureText, getRunAdvance, and getTextWidths.
+            if (compareWithOtherMethods && start == contextStart && end == contextEnd) {
+                assertEquals(advance, p.measureText(str, start, end), 1.0f);
+                assertEquals(advance, p.getRunAdvance(
+                        str, start, end, contextStart, contextEnd, isRtl, end), 1.0f);
+
+                final float[] widths = new float[count];
+                p.getTextWidths(str, start, end, widths);
+                for (int i = 0; i < count; i++) {
+                    assertEquals(advanceArrays[0][i], widths[i], 1.0f);
+                }
+            }
+        }
+    }
+
+    public void testGetTextRunAdvances_invalid() {
+        Paint p = new Paint();
+        String text = "test";
+
+        try {
+            p.getTextRunAdvances((String)null, 0, 0, 0, 0, false, null, 0);
+            fail("Should throw an IllegalArgumentException.");
+        } catch (IllegalArgumentException e) {
+        }
+
+        try {
+            p.getTextRunAdvances((CharSequence)null, 0, 0, 0, 0, false, null, 0);
+            fail("Should throw an IllegalArgumentException.");
+        } catch (IllegalArgumentException e) {
+        }
+
+        try {
+            p.getTextRunAdvances((char[])null, 0, 0, 0, 0, false, null, 0);
+            fail("Should throw an IllegalArgumentException.");
+        } catch (IllegalArgumentException e) {
+        }
+
+        try {
+            p.getTextRunAdvances(text, 0, text.length(), 0, text.length(), false,
+                    new float[text.length() - 1], 0);
+            fail("Should throw an IndexOutOfBoundsException.");
+        } catch (IndexOutOfBoundsException e) {
+        }
+
+        try {
+            p.getTextRunAdvances(text, 0, text.length(), 0, text.length(), false,
+                    new float[text.length()], 1);
+            fail("Should throw an IndexOutOfBoundsException.");
+        } catch (IndexOutOfBoundsException e) {
+        }
+
+        // 0 > contextStart
+        try {
+            p.getTextRunAdvances(text, 0, text.length(), -1, text.length(), false, null, 0);
+            fail("Should throw an IndexOutOfBoundsException.");
+        } catch (IndexOutOfBoundsException e) {
+        }
+
+        // contextStart > start
+        try {
+            p.getTextRunAdvances(text, 0, text.length(), 1, text.length(), false, null, 0);
+            fail("Should throw an IndexOutOfBoundsException.");
+        } catch (IndexOutOfBoundsException e) {
+        }
+
+        // start > end
+        try {
+            p.getTextRunAdvances(text, 1, 0, 0, text.length(), false, null, 0);
+            fail("Should throw an IndexOutOfBoundsException.");
+        } catch (IndexOutOfBoundsException e) {
+        }
+
+        // end > contextEnd
+        try {
+            p.getTextRunAdvances(text, 0, text.length(), 0, text.length() - 1, false, null, 0);
+            fail("Should throw an IndexOutOfBoundsException.");
+        } catch (IndexOutOfBoundsException e) {
+        }
+
+        // contextEnd > text.length
+        try {
+            p.getTextRunAdvances(text, 0, text.length(), 0, text.length() + 1, false, null, 0);
+            fail("Should throw an IndexOutOfBoundsException.");
+        } catch (IndexOutOfBoundsException e) {
+        }
+    }
+}