Antialiasing fixes

lib3270j/src/test/java/haus/nightmare/lib3270j/graphics/GocaDecoderTest.java

@@ -218,22 +218,22 @@ public class GocaDecoderTest {
 
     @Test
     public void test3179GCoordinateMapping() {
-        GraphicsPlane plane = new GraphicsPlane(720, 516);
+        GraphicsPlane plane = new GraphicsPlane(1000, 750);
         plane.setScreenDimensions(80, 43);
 
-        // Screen center (0, 0) should map to canvas center (360, 257)
-        assertEquals(360, plane.mapX(0));
-        assertEquals(257, plane.mapY(0));
+        // Screen center (0, 0) should map to canvas center
+        assertEquals(500, plane.mapX(0));
+        assertEquals(374, plane.mapY(0));
 
-        // Left edge (-360) should map to 0
-        assertEquals(0, plane.mapX(-360));
-        // Right edge (+359) should map to 719
-        assertEquals(719, plane.mapX(359));
+        // Left edge (-xMax) should map to 0
+        assertEquals(0, plane.mapX(-plane.getXMax()));
+        // Right edge (+xMax) should map to 1000
+        assertEquals(1000, plane.mapX(plane.getXMax()));
 
-        // Top edge (+257) should map to 0
-        assertEquals(0, plane.mapY(257));
-        // Bottom edge (-258) should map to 515
-        assertEquals(515, plane.mapY(-258));
+        // Top edge (+yMax) should map to 0
+        assertEquals(0, plane.mapY(plane.getYMax()));
+        // Bottom edge (yMax - totalHeight) should map to 750
+        assertEquals(750, plane.mapY(plane.getYMax() - plane.getTotalHeight()));
 
         // Bidirectional roundtrip mapping must be exact
         assertEquals(0, plane.unmapX(plane.mapX(0)));
@@ -512,7 +512,7 @@ public class GocaDecoderTest {
 
     @Test
     public void testMultiPolygonAreaFilling() {
-        GraphicsPlane plane = new GraphicsPlane(200, 200);
+        GraphicsPlane plane = new GraphicsPlane(1000, 750);
         GocaDecoder decoder = new GocaDecoder(plane);
 
         // Sequence: GBAR (0x68) short form 0x80 (bounded, always filled in GOCA)
@@ -786,11 +786,18 @@ public class GocaDecoderTest {
         }
         assertTrue(foundBlue, "Slide body must contain stippled blue pixels");
 
-        // Verify that the boundary (e.g. at (10, 50)) is drawn in White!
+        // Verify that the boundary (e.g. at X=10) is drawn in White!
         int whiteArgb = GocaConstants.GOCA_COLORS[7];
         int borderX = plane.mapX(10);
-        int borderY = plane.mapY(50);
-        int borderPixel = plane.getRgbBuffer()[borderY * plane.getCanvasWidth() + borderX];
-        assertEquals(whiteArgb, borderPixel, "Slide border outline must be drawn in White");
+        boolean foundWhite = false;
+        int y1 = Math.min(plane.mapY(10), plane.mapY(90));
+        int y2 = Math.max(plane.mapY(10), plane.mapY(90));
+        for (int y = y1; y <= y2; y++) {
+            if (plane.getRgbBuffer()[y * plane.getCanvasWidth() + borderX] == whiteArgb) {
+                foundWhite = true;
+                break;
+            }
+        }
+        assertTrue(foundWhite, "Slide border outline must be drawn in White");
     }
 }