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package org.robolectric.integrationtests.nativegraphics;
import static android.os.Build.VERSION_CODES.O;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThrows;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Shader;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.annotation.Config;
@RunWith(AndroidJUnit4.class)
@Config(minSdk = O)
public class ShadowNativeBitmapShaderTest {
private static final int TILE_WIDTH = 20;
private static final int TILE_HEIGHT = 20;
private static final int BORDER_WIDTH = 5;
private static final int BORDER_COLOR = Color.BLUE;
private static final int CENTER_COLOR = Color.RED;
private static final int NUM_TILES = 4;
@Test
public void testBitmapShader() {
Bitmap tile = Bitmap.createBitmap(TILE_WIDTH, TILE_HEIGHT, Bitmap.Config.ARGB_8888);
tile.eraseColor(BORDER_COLOR);
Canvas c = new Canvas(tile);
Paint p = new Paint();
p.setColor(CENTER_COLOR);
c.drawRect(
BORDER_WIDTH, BORDER_WIDTH, TILE_WIDTH - BORDER_WIDTH, TILE_HEIGHT - BORDER_WIDTH, p);
BitmapShader shader = new BitmapShader(tile, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
Paint paint = new Paint();
paint.setShader(shader);
// create a bitmap that fits (NUM_TILES - 0.5) tiles in both directions
Bitmap b =
Bitmap.createBitmap(
NUM_TILES * TILE_WIDTH - TILE_WIDTH / 2,
NUM_TILES * TILE_HEIGHT - TILE_HEIGHT / 2,
Bitmap.Config.ARGB_8888);
b.eraseColor(Color.BLACK);
Canvas canvas = new Canvas(b);
canvas.drawPaint(paint);
for (int y = 0; y < NUM_TILES; y++) {
for (int x = 0; x < NUM_TILES; x++) {
verifyTile(b, x * TILE_WIDTH, y * TILE_HEIGHT);
}
}
}
/** Check the colors of the tile at the given coordinates in the given bitmap. */
private void verifyTile(Bitmap bitmap, int tileX, int tileY) {
for (int y = 0; y < TILE_HEIGHT; y++) {
for (int x = 0; x < TILE_WIDTH; x++) {
if (x < BORDER_WIDTH
|| x >= TILE_WIDTH - BORDER_WIDTH
|| y < BORDER_WIDTH
|| y >= TILE_HEIGHT - BORDER_WIDTH) {
verifyColor(BORDER_COLOR, bitmap, x + tileX, y + tileY);
} else {
verifyColor(CENTER_COLOR, bitmap, x + tileX, y + tileY);
}
}
}
}
/**
* Asserts that the pixel at the given coordinates in the given bitmap matches the given color.
* Simply returns if the coordinates are outside the bitmap area.
*/
private void verifyColor(int color, Bitmap bitmap, int x, int y) {
if (x < bitmap.getWidth() && y < bitmap.getHeight()) {
assertEquals(color, bitmap.getPixel(x, y));
}
}
@Test
public void testClamp() {
Bitmap bitmap = Bitmap.createBitmap(2, 1, Bitmap.Config.ARGB_8888);
bitmap.setPixel(0, 0, Color.RED);
bitmap.setPixel(1, 0, Color.BLUE);
BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
Bitmap dstBitmap = Bitmap.createBitmap(4, 1, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(dstBitmap);
Paint paint = new Paint();
paint.setShader(shader);
canvas.drawRect(0, 0, 4, 1, paint);
canvas.setBitmap(null);
int[] pixels = new int[4];
dstBitmap.getPixels(pixels, 0, 4, 0, 0, 4, 1);
Assert.assertArrayEquals(new int[] {Color.RED, Color.BLUE, Color.BLUE, Color.BLUE}, pixels);
}
@Test
public void testRepeat() {
Bitmap bitmap = Bitmap.createBitmap(2, 1, Bitmap.Config.ARGB_8888);
bitmap.setPixel(0, 0, Color.RED);
bitmap.setPixel(1, 0, Color.BLUE);
BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
Bitmap dstBitmap = Bitmap.createBitmap(4, 1, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(dstBitmap);
Paint paint = new Paint();
paint.setShader(shader);
canvas.drawRect(0, 0, 4, 1, paint);
canvas.setBitmap(null);
int[] pixels = new int[4];
dstBitmap.getPixels(pixels, 0, 4, 0, 0, 4, 1);
Assert.assertArrayEquals(new int[] {Color.RED, Color.BLUE, Color.RED, Color.BLUE}, pixels);
}
@Test
public void testMirror() {
Bitmap bitmap = Bitmap.createBitmap(2, 1, Bitmap.Config.ARGB_8888);
bitmap.setPixel(0, 0, Color.RED);
bitmap.setPixel(1, 0, Color.BLUE);
BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.MIRROR, Shader.TileMode.MIRROR);
Bitmap dstBitmap = Bitmap.createBitmap(4, 1, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(dstBitmap);
Paint paint = new Paint();
paint.setShader(shader);
canvas.drawRect(0, 0, 4, 1, paint);
canvas.setBitmap(null);
int[] pixels = new int[4];
dstBitmap.getPixels(pixels, 0, 4, 0, 0, 4, 1);
Assert.assertArrayEquals(new int[] {Color.RED, Color.BLUE, Color.BLUE, Color.RED}, pixels);
}
@Test
public void testNullBitmap() {
assertThrows(
IllegalArgumentException.class,
() -> new BitmapShader(null, Shader.TileMode.MIRROR, Shader.TileMode.MIRROR));
}
}
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