Add unittest to GlRectDrawer

talk/app/webrtc/androidtests/src/org/webrtc/GlRectDrawerTest.java

Index: talk/app/webrtc/androidtests/src/org/webrtc/GlRectDrawerTest.java
diff --git a/talk/app/webrtc/androidtests/src/org/webrtc/GlRectDrawerTest.java b/talk/app/webrtc/androidtests/src/org/webrtc/GlRectDrawerTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..5631981683beb0b4719fd350040b748c68418091
--- /dev/null
+++ b/talk/app/webrtc/androidtests/src/org/webrtc/GlRectDrawerTest.java
@@ -0,0 +1,138 @@
+/*
+ * libjingle
+ * Copyright 2015 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package org.webrtc;
+
+import android.test.ActivityTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+
+import java.nio.ByteBuffer;
+import java.util.Random;
+
+import android.opengl.EGL14;
+import android.opengl.Matrix;
+import android.opengl.GLES20;
+
+public class GlRectDrawerTest extends ActivityTestCase {
+  // Resolution of the test image.
+  private static final int WIDTH = 16;
+  private static final int HEIGHT = 16;
+  // Seed for random pixel creation.
+  private static final int SEED = 42;
+  // When comparing pixels, allow some slack for float arithmetic and integer rounding.
+  final float MAX_DIFF = 1.0f;
+
+  private static float normalizedByte(byte b) {
+    return (b & 0xFF) / 255.0f;
+  }
+
+  private static float saturatedConvert(float c) {
+    return 255.0f * Math.max(0, Math.min(c, 1));
+  }
+
+  @SmallTest
+  public void testYuvRendering() throws Exception {
+    // Create EGL base with a pixel buffer as display output.
+    EglBase eglBase = eglBase = new EglBase(EGL14.EGL_NO_CONTEXT, EglBase.ConfigType.PIXEL_BUFFER);
+    eglBase.createPbufferSurface(WIDTH, HEIGHT);
+    eglBase.makeCurrent();
+
+    // Create YUV byte buffer planes with random content.
+    final ByteBuffer[] yuvPlanes = new ByteBuffer[3];
+    final Random random = new Random(SEED);
+    for (int i = 0; i < 3; ++i) {
+      yuvPlanes[i] = ByteBuffer.allocateDirect(WIDTH * HEIGHT);
+      random.nextBytes(yuvPlanes[i].array());
+    }
+
+    // Generate 3 texture ids for Y/U/V.
+    final int yuvTextures[] = new int[3];
+    GLES20.glGenTextures(3, yuvTextures, 0);
+    for (int i = 0; i < 3; i++)  {
+      GLES20.glActiveTexture(GLES20.GL_TEXTURE0 + i);
+      GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, yuvTextures[i]);
+      GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
+          GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
+      GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
+          GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
+      GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
+          GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+      GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
+          GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+    }
+    GlUtil.checkNoGLES2Error("YUV glGenTextures");
+
+    // Upload the YUV byte buffer data as textures.
+    for (int i = 0; i < 3; ++i) {
+      GLES20.glActiveTexture(GLES20.GL_TEXTURE0 + i);
+      GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, yuvTextures[i]);
+      GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE, WIDTH,
+          HEIGHT, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, yuvPlanes[i]);
+    }
+
+    // Draw the YUV frame onto the pixel buffer.
+    final GlRectDrawer drawer = new GlRectDrawer();
+    final float[] texMatrix = new float[16];
+    Matrix.setIdentityM(texMatrix, 0);
+    drawer.drawYuv(WIDTH, HEIGHT, yuvTextures, texMatrix);
+
+    // Download the pixels in the pixel buffer as RGBA.
+    final ByteBuffer data = ByteBuffer.allocateDirect(WIDTH * HEIGHT * 4);
+    GLES20.glReadPixels(0, 0, WIDTH, HEIGHT, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, data);
+
+    // Compare the YUV data with the RGBA result.
+    for (int y = 0; y < HEIGHT; ++y) {
+      for (int x = 0; x < WIDTH; ++x) {
+        // YUV color space. Y in [0, 1], UV in [-0.5, 0.5]. The constants are taken from the YUV
+        // fragment shader code in GlRectDrawer.
+        final float y_luma = normalizedByte(yuvPlanes[0].get());
+        final float u_chroma = normalizedByte(yuvPlanes[1].get()) - 0.5f;
+        final float v_chroma = normalizedByte(yuvPlanes[2].get()) - 0.5f;
+        // Expected color in unrounded RGB [0.0f, 255.0f].
+        final float expectedRed = saturatedConvert(y_luma + 1.403f * v_chroma);
+        final float expectedGreen =
+            saturatedConvert(y_luma - 0.344f * u_chroma - 0.714f * v_chroma);
+        final float expectedBlue = saturatedConvert(y_luma + 1.77f * u_chroma);
+
+        // Actual color in RGB8888.
+        final int actualRed = data.get() & 0xFF;
+        final int actualGreen = data.get() & 0xFF;
+        final int actualBlue = data.get() & 0xFF;
+        final int actualAlpha = data.get() & 0xFF;
+
+        // Assert rendered image is close to pixel perfect from source YUV.
+        assertTrue(Math.abs(actualRed - expectedRed) < MAX_DIFF);
+        assertTrue(Math.abs(actualGreen - expectedGreen) < MAX_DIFF);
+        assertTrue(Math.abs(actualBlue - expectedBlue) < MAX_DIFF);
+        assertEquals(actualAlpha, 255);
+      }
+    }
+
+    drawer.release();
+    GLES20.glDeleteTextures(3, yuvTextures, 0);
+    eglBase.release();
+  }
+}