Class TextLineTest

tests/java/TextLineTest.java:11–169

import io.github.humbleui.skija.test.runner.*;

public class TextLineTest implements Executable {
    public Font inter36 = new Font(FontMgr.getDefault().makeFromFile("fonts/InterHinted-Regular.ttf"), 36);
    public Font firaCode36 = new Font(FontMgr.getDefault().makeFromFile("fonts/FiraCode-Regular.ttf"), 36);
    public Font jbMono36 = new Font(FontMgr.getDefault().makeFromFile("fonts/JetBrainsMono-Regular.ttf"), 36);

    @Override
    public void execute() throws Exception {
        testAbc();
        testLigatures();
        testCombining();
        testEmoji();
    }

    public void testAbc() {
        try (TextLine line = TextLine.make("abc", inter36);) {
            assertArrayEquals(new short[] {503, 574, 581}, line.getGlyphs());
            assertArrayEquals(new int[] {0, 1, 2, 3}, TextLine._nGetBreakOffsets(line._ptr));
            assertArrayEquals(new float[] {0f, 20f, 42f, 62f}, TextLine._nGetBreakPositions(line._ptr));

            pushStack("getOffsetAtCoord");
            assertEquals(0, line.getOffsetAtCoord(-10f)); // before “a”

            assertEquals(0, line.getOffsetAtCoord(0f));   // beginning of “a”
            assertEquals(0, line.getOffsetAtCoord(5f));   // left half of “a”
            assertEquals(1, line.getOffsetAtCoord(10f));  // center of “a”
            assertEquals(1, line.getOffsetAtCoord(15f));  // right half of “a”

            assertEquals(1, line.getOffsetAtCoord(20f));  // between “a” and “b”
            assertEquals(1, line.getOffsetAtCoord(25f));  // left half of “b”
            assertEquals(2, line.getOffsetAtCoord(31f));  // center of “b”
            assertEquals(2, line.getOffsetAtCoord(36f));  // right half of “b”

            assertEquals(2, line.getOffsetAtCoord(42f));  // between “b” and “c”
            assertEquals(2, line.getOffsetAtCoord(47f));  // left half of “c”
            assertEquals(3, line.getOffsetAtCoord(52f));  // center of “c”
            assertEquals(3, line.getOffsetAtCoord(57f));  // right half of “c”
            
            assertEquals(3, line.getOffsetAtCoord(62f));  // end of “c”
            assertEquals(3, line.getOffsetAtCoord(100f)); // after “c”
            popStack();

            pushStack("getLeftOffsetAtCoord");
            assertEquals(0, line.getLeftOffsetAtCoord(-10f)); // before “a”

            assertEquals(0, line.getLeftOffsetAtCoord(0f));   // beginning of “a”
            assertEquals(0, line.getLeftOffsetAtCoord(5f));   // left half of “a”
            assertEquals(0, line.getLeftOffsetAtCoord(10f));  // center of “a”
            assertEquals(0, line.getLeftOffsetAtCoord(15f));  // right half of “a”

            assertEquals(1, line.getLeftOffsetAtCoord(20f));  // between “a” and “b”
            assertEquals(1, line.getLeftOffsetAtCoord(25f));  // left half of “b”
            assertEquals(1, line.getLeftOffsetAtCoord(31f));  // center of “b”
            assertEquals(1, line.getLeftOffsetAtCoord(36f));  // right half of “b”

            assertEquals(2, line.getLeftOffsetAtCoord(42f));  // between “b” and “c”
            assertEquals(2, line.getLeftOffsetAtCoord(47f));  // left half of “c”
            assertEquals(2, line.getLeftOffsetAtCoord(52f));  // center of “c”
            assertEquals(2, line.getLeftOffsetAtCoord(57f));  // right half of “c”