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/*
* Copyright (C) 2006 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.suitebuilder.annotation.SmallTest;
import junit.framework.TestCase;
public class BitmapTest extends TestCase {
@SmallTest
public void testBasic() throws Exception {
Bitmap bm1 = Bitmap.createBitmap(100, 200, Bitmap.Config.ARGB_8888);
Bitmap bm2 = Bitmap.createBitmap(100, 200, Bitmap.Config.RGB_565);
Bitmap bm3 = Bitmap.createBitmap(100, 200, Bitmap.Config.ARGB_4444);
assertTrue("mutability", bm1.isMutable());
assertTrue("mutability", bm2.isMutable());
assertTrue("mutability", bm3.isMutable());
assertEquals("width", 100, bm1.getWidth());
assertEquals("width", 100, bm2.getWidth());
assertEquals("width", 100, bm3.getWidth());
assertEquals("rowbytes", 400, bm1.getRowBytes());
assertEquals("rowbytes", 200, bm2.getRowBytes());
assertEquals("rowbytes", 200, bm3.getRowBytes());
assertEquals("byteCount", 80000, bm1.getByteCount());
assertEquals("byteCount", 40000, bm2.getByteCount());
assertEquals("byteCount", 40000, bm3.getByteCount());
assertEquals("height", 200, bm1.getHeight());
assertEquals("height", 200, bm2.getHeight());
assertEquals("height", 200, bm3.getHeight());
assertTrue("hasAlpha", bm1.hasAlpha());
assertFalse("hasAlpha", bm2.hasAlpha());
assertTrue("hasAlpha", bm3.hasAlpha());
assertTrue("getConfig", bm1.getConfig() == Bitmap.Config.ARGB_8888);
assertTrue("getConfig", bm2.getConfig() == Bitmap.Config.RGB_565);
assertTrue("getConfig", bm3.getConfig() == Bitmap.Config.ARGB_4444);
}
@SmallTest
public void testMutability() throws Exception {
Bitmap bm1 = Bitmap.createBitmap(100, 200, Bitmap.Config.ARGB_8888);
Bitmap bm2 = Bitmap.createBitmap(new int[100 * 200], 100, 200,
Bitmap.Config.ARGB_8888);
assertTrue("mutability", bm1.isMutable());
assertFalse("mutability", bm2.isMutable());
bm1.eraseColor(0);
try {
bm2.eraseColor(0);
fail("eraseColor should throw exception");
} catch (IllegalStateException ex) {
// safe to catch and ignore this
}
}
@SmallTest
public void testGetPixelsWithAlpha() throws Exception {
int[] colors = new int[100];
for (int i = 0; i < 100; i++) {
colors[i] = (0xFF << 24) | (i << 16) | (i << 8) | i;
}
Bitmap bm = Bitmap.createBitmap(colors, 10, 10,
Bitmap.Config.ARGB_8888);
int[] pixels = new int[100];
bm.getPixels(pixels, 0, 10, 0, 0, 10, 10);
for (int i = 0; i < 100; i++) {
int p = bm.getPixel(i % 10, i / 10);
assertEquals("getPixels", p, pixels[i]);
}
for (int i = 0; i < 100; i++) {
int p = bm.getPixel(i % 10, i / 10);
assertEquals("getPixel", p, colors[i]);
assertEquals("pixel value", p,
((0xFF << 24) | (i << 16) | (i << 8) | i));
}
}
@SmallTest
public void testGetPixelsWithoutAlpha() throws Exception {
int[] colors = new int[100];
for (int i = 0; i < 100; i++) {
colors[i] = (0xFF << 24) | (i << 16) | (i << 8) | i;
}
Bitmap bm = Bitmap.createBitmap(colors, 10, 10, Bitmap.Config.RGB_565);
int[] pixels = new int[100];
bm.getPixels(pixels, 0, 10, 0, 0, 10, 10);
for (int i = 0; i < 100; i++) {
int p = bm.getPixel(i % 10, i / 10);
assertEquals("getPixels", p, pixels[i]);
}
}
@SmallTest
public void testSetPixelsWithAlpha() throws Exception {
int[] colors = new int[100];
for (int i = 0; i < 100; i++) {
colors[i] = (0xFF << 24) | (i << 16) | (i << 8) | i;
}
Bitmap.Config config = Bitmap.Config.ARGB_8888;
Bitmap bm1 = Bitmap.createBitmap(colors, 10, 10, config);
Bitmap bm2 = Bitmap.createBitmap(10, 10, config);
for (int i = 0; i < 100; i++) {
bm2.setPixel(i % 10, i / 10, colors[i]);
}
for (int i = 0; i < 100; i++) {
assertEquals("setPixel",
bm1.getPixel(i % 10, i / 10), bm2.getPixel(i % 10, i / 10));
}
for (int i = 0; i < 100; i++) {
assertEquals("setPixel value",
bm1.getPixel(i % 10, i / 10), colors[i]);
}
}
@SmallTest
public void testSetPixelsWithoutAlpha() throws Exception {
int[] colors = new int[100];
for (int i = 0; i < 100; i++) {
colors[i] = (0xFF << 24) | (i << 16) | (i << 8) | i;
}
Bitmap.Config config = Bitmap.Config.RGB_565;
Bitmap bm1 = Bitmap.createBitmap(colors, 10, 10, config);
Bitmap bm2 = Bitmap.createBitmap(10, 10, config);
for (int i = 0; i < 100; i++) {
bm2.setPixel(i % 10, i / 10, colors[i]);
}
for (int i = 0; i < 100; i++) {
assertEquals("setPixel", bm1.getPixel(i % 10, i / 10),
bm2.getPixel(i % 10, i / 10));
}
}
private static int computePrePostMul(int alpha, int comp) {
if (alpha == 0) {
return 0;
}
int premul = Math.round(alpha * comp / 255.f);
int unpre = Math.round(255.0f * premul / alpha);
return unpre;
}
@SmallTest
public void testSetPixelsWithNonOpaqueAlpha() throws Exception {
int[] colors = new int[256];
for (int i = 0; i < 256; i++) {
colors[i] = (i << 24) | (0xFF << 16) | (0x80 << 8) | 0;
}
Bitmap.Config config = Bitmap.Config.ARGB_8888;
// create a bitmap with the color array specified
Bitmap bm1 = Bitmap.createBitmap(colors, 16, 16, config);
// create a bitmap with no colors, but then call setPixels
Bitmap bm2 = Bitmap.createBitmap(16, 16, config);
bm2.setPixels(colors, 0, 16, 0, 0, 16, 16);
// now check that we did a good job returning the unpremultiplied alpha
final int tolerance = 1;
for (int i = 0; i < 256; i++) {
int c0 = colors[i];
int c1 = bm1.getPixel(i % 16, i / 16);
int c2 = bm2.getPixel(i % 16, i / 16);
// these two should always be identical
assertEquals("getPixel", c1, c2);
// comparing the original (c0) with the returned color is tricky,
// since it gets premultiplied during the set(), and unpremultiplied
// by the get().
int a0 = Color.alpha(c0);
int a1 = Color.alpha(c1);
assertEquals("alpha", a0, a1);
int r0 = Color.red(c0);
int r1 = Color.red(c1);
int rr = computePrePostMul(a0, r0);
assertTrue("red", Math.abs(rr - r1) <= tolerance);
int g0 = Color.green(c0);
int g1 = Color.green(c1);
int gg = computePrePostMul(a0, g0);
assertTrue("green", Math.abs(gg - g1) <= tolerance);
int b0 = Color.blue(c0);
int b1 = Color.blue(c1);
int bb = computePrePostMul(a0, b0);
assertTrue("blue", Math.abs(bb - b1) <= tolerance);
if (false) {
int cc = Color.argb(a0, rr, gg, bb);
android.util.Log.d("skia", "original " + Integer.toHexString(c0) +
" set+get " + Integer.toHexString(c1) +
" local " + Integer.toHexString(cc));
}
}
}
}
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