Merge RgbProcessor and MatrixTransformation.

PiperOrigin-RevId: 472325145
(cherry picked from commit daa77da1)

google3/third_party/java_src/android_libs/media/libraries/effect/src/androidTest/java/androidx/media3/effect/MatrixTransformationProcessorPixelTest.java

@@ -28,7 +28,6 @@ import android.opengl.EGLSurface;
 import androidx.media3.common.FrameProcessingException;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.util.GlUtil;
-import com.google.common.collect.ImmutableList;
 import java.io.IOException;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.junit.After;
@@ -97,8 +96,7 @@ public final class MatrixTransformationProcessorPixelTest {
     Matrix identityMatrix = new Matrix();
     MatrixTransformation noEditsTransformation = (long presentationTimeUs) -> identityMatrix;
     matrixTransformationFrameProcessor =
-        MatrixTransformationProcessor.create(
-            context, ImmutableList.of(noEditsTransformation), /* useHdr= */ false);
+        noEditsTransformation.toGlTextureProcessor(context, /* useHdr= */ false);
     matrixTransformationFrameProcessor.configure(width, height);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(ORIGINAL_PNG_ASSET_PATH);
 
@@ -123,8 +121,7 @@ public final class MatrixTransformationProcessorPixelTest {
     MatrixTransformation translateRightTransformation =
         (long presentationTimeUs) -> translateRightMatrix;
     matrixTransformationFrameProcessor =
-        MatrixTransformationProcessor.create(
-            context, ImmutableList.of(translateRightTransformation), /* useHdr= */ false);
+        translateRightTransformation.toGlTextureProcessor(context, /* useHdr= */ false);
     matrixTransformationFrameProcessor.configure(width, height);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(TRANSLATE_RIGHT_PNG_ASSET_PATH);
 
@@ -148,8 +145,7 @@ public final class MatrixTransformationProcessorPixelTest {
     scaleNarrowMatrix.postScale(.5f, 1.2f);
     MatrixTransformation scaleNarrowTransformation = (long presentationTimeUs) -> scaleNarrowMatrix;
     matrixTransformationFrameProcessor =
-        MatrixTransformationProcessor.create(
-            context, ImmutableList.of(scaleNarrowTransformation), /* useHdr= */ false);
+        scaleNarrowTransformation.toGlTextureProcessor(context, /* useHdr= */ false);
     matrixTransformationFrameProcessor.configure(width, height);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(SCALE_NARROW_PNG_ASSET_PATH);
 
@@ -173,8 +169,7 @@ public final class MatrixTransformationProcessorPixelTest {
     rotate90Matrix.postRotate(/* degrees= */ 90);
     MatrixTransformation rotate90Transformation = (long presentationTimeUs) -> rotate90Matrix;
     matrixTransformationFrameProcessor =
-        MatrixTransformationProcessor.create(
-            context, ImmutableList.of(rotate90Transformation), /* useHdr= */ false);
+        rotate90Transformation.toGlTextureProcessor(context, /* useHdr= */ false);
     matrixTransformationFrameProcessor.configure(width, height);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(ROTATE_90_PNG_ASSET_PATH);
 

google3/third_party/java_src/android_libs/media/libraries/effect/src/androidTest/java/androidx/media3/effect/RgbFilterPixelTest.java

@@ -58,7 +58,7 @@ public final class RgbFilterPixelTest {
 
   private @MonotonicNonNull EGLDisplay eglDisplay;
   private @MonotonicNonNull EGLContext eglContext;
-  private @MonotonicNonNull SingleFrameGlTextureProcessor rgbMatrixProcessor;
+  private @MonotonicNonNull SingleFrameGlTextureProcessor matrixTransformationProcessor;
   private @MonotonicNonNull EGLSurface placeholderEglSurface;
   private int inputTexId;
   private int outputTexId;
@@ -90,8 +90,8 @@ public final class RgbFilterPixelTest {
 
   @After
   public void release() throws GlUtil.GlException, FrameProcessingException {
-    if (rgbMatrixProcessor != null) {
-      rgbMatrixProcessor.release();
+    if (matrixTransformationProcessor != null) {
+      matrixTransformationProcessor.release();
     }
     GlUtil.destroyEglContext(eglDisplay, eglContext);
   }
@@ -100,11 +100,13 @@ public final class RgbFilterPixelTest {
   public void drawFrame_grayscale_producesGrayscaleImage() throws Exception {
     String testId = "drawFrame_grayscale";
     RgbMatrix grayscaleMatrix = RgbFilter.createGrayscaleFilter();
-    rgbMatrixProcessor = new RgbMatrixProcessor(context, grayscaleMatrix, /* useHdr= */ false);
-    Pair<Integer, Integer> outputSize = rgbMatrixProcessor.configure(inputWidth, inputHeight);
+    matrixTransformationProcessor =
+        grayscaleMatrix.toGlTextureProcessor(context, /* useHdr= */ false);
+    Pair<Integer, Integer> outputSize =
+        matrixTransformationProcessor.configure(inputWidth, inputHeight);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(GRAYSCALE_PNG_ASSET_PATH);
 
-    rgbMatrixProcessor.drawFrame(inputTexId, /* presentationTimeUs= */ 0);
+    matrixTransformationProcessor.drawFrame(inputTexId, /* presentationTimeUs= */ 0);
     Bitmap actualBitmap =
         BitmapTestUtil.createArgb8888BitmapFromCurrentGlFramebuffer(
             outputSize.first, outputSize.second);
@@ -121,11 +123,13 @@ public final class RgbFilterPixelTest {
   public void drawFrame_inverted_producesInvertedFrame() throws Exception {
     String testId = "drawFrame_inverted";
     RgbMatrix invertedMatrix = RgbFilter.createInvertedFilter();
-    rgbMatrixProcessor = new RgbMatrixProcessor(context, invertedMatrix, /* useHdr= */ false);
-    Pair<Integer, Integer> outputSize = rgbMatrixProcessor.configure(inputWidth, inputHeight);
+    matrixTransformationProcessor =
+        invertedMatrix.toGlTextureProcessor(context, /* useHdr= */ false);
+    Pair<Integer, Integer> outputSize =
+        matrixTransformationProcessor.configure(inputWidth, inputHeight);
     Bitmap expectedBitmap = BitmapTestUtil.readBitmap(INVERT_PNG_ASSET_PATH);
 
-    rgbMatrixProcessor.drawFrame(inputTexId, /* presentationTimeUs= */ 0);
+    matrixTransformationProcessor.drawFrame(inputTexId, /* presentationTimeUs= */ 0);
     Bitmap actualBitmap =
         BitmapTestUtil.createArgb8888BitmapFromCurrentGlFramebuffer(
             outputSize.first, outputSize.second);

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/assets/shaders/fragment_shader_copy_es2.glsl

-#version 100
-// Copyright 2022 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.
-
-// ES 2 fragment shader that samples from a (non-external) texture with uTexSampler,
-// copying from this texture to the current output.
-
-precision mediump float;
-uniform sampler2D uTexSampler;
-varying vec2 vTexSamplingCoord;
-void main() {
-  gl_FragColor = texture2D(uTexSampler, vTexSamplingCoord);
-}

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/assets/shaders/fragment_shader_oetf_es3.glsl

@@ -15,7 +15,8 @@
 
 // ES 3 fragment shader that:
 // 1. samples optical linear BT.2020 RGB from a (non-external) texture with
-//    uTexSampler,
+//    uTexSampler, and applies a 4x4 RGB color matrix to change the pixel
+//    colors,
 // 2. applies the HLG or PQ OETF to yield electrical (HLG or PQ) BT.2020 RGB,
 //    and
 // 3. copies this converted texture color to the current output.
@@ -28,6 +29,7 @@ out vec4 outColor;
 // Only COLOR_TRANSFER_ST2084 and COLOR_TRANSFER_HLG are allowed.
 uniform int uOetfColorTransfer;
 uniform mat3 uColorTransform;
+uniform mat4 uRgbMatrix;
 
 // TODO(b/227624622): Consider using mediump to save precision, if it won't lead
 //  to noticeable quantization.
@@ -83,5 +85,6 @@ highp vec3 getElectricalColor(highp vec3 linearColor) {
 
 void main() {
   vec4 inputColor = texture(uTexSampler, vTexSamplingCoord);
-  outColor = vec4(getElectricalColor(inputColor.rgb), inputColor.a);
+  vec4 transformedColors = uRgbMatrix * vec4(inputColor.rgb, 1);
+  outColor = vec4(getElectricalColor(transformedColors.rgb), inputColor.a);
 }

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/assets/shaders/fragment_shader_transformation_es2.glsl

@@ -19,11 +19,11 @@
 
 precision mediump float;
 uniform sampler2D uTexSampler;
-uniform mat4 uColorMatrix;
+uniform mat4 uRgbMatrix;
 varying vec2 vTexSamplingCoord;
 
 void main() {
     vec4 inputColor = texture2D(uTexSampler, vTexSamplingCoord);
-    gl_FragColor = uColorMatrix * vec4(inputColor.rgb, 1);
+    gl_FragColor = uRgbMatrix * vec4(inputColor.rgb, 1);
     gl_FragColor.a = inputColor.a;
 }

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/assets/shaders/fragment_shader_copy_external_es2.glsl → google3/third_party/java_src/android_libs/media/libraries/effect/src/main/assets/shaders/fragment_shader_transformation_external_es2.glsl

@@ -14,12 +14,17 @@
 // limitations under the License.
 
 // ES 2 fragment shader that samples from an external texture with uTexSampler,
-// copying from this texture to the current output.
+// copying from this texture to the current output while applying a 4x4 RGB
+// color matrix to change the pixel colors.
 
 #extension GL_OES_EGL_image_external : require
 precision mediump float;
 uniform samplerExternalOES uTexSampler;
+uniform mat4 uRgbMatrix;
 varying vec2 vTexSamplingCoord;
+
 void main() {
-  gl_FragColor = texture2D(uTexSampler, vTexSamplingCoord);
+  vec4 inputColor = texture2D(uTexSampler, vTexSamplingCoord);
+  gl_FragColor = uRgbMatrix * vec4(inputColor.rgb, 1);
+  gl_FragColor.a = inputColor.a;
 }

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/assets/shaders/fragment_shader_copy_external_yuv_es3.glsl → google3/third_party/java_src/android_libs/media/libraries/effect/src/main/assets/shaders/fragment_shader_transformation_external_yuv_es3.glsl

@@ -23,13 +23,15 @@
 // 3. If uEotfColorTransfer is COLOR_TRANSFER_NO_VALUE, outputs electrical
 //    (HLG or PQ) BT.2020 RGB. Otherwise, outputs optical linear BT.2020 RGB for
 //    intermediate shaders by applying the HLG or PQ EOTF.
-// 4. Copies this converted texture color to the current output, with alpha = 1.
+// 4. Copies this converted texture color to the current output, with alpha = 1,
+//    while applying a 4x4 RGB color matrix to change the pixel colors.
 
 #extension GL_OES_EGL_image_external : require
 #extension GL_EXT_YUV_target : require
 precision mediump float;
 uniform __samplerExternal2DY2YEXT uTexSampler;
 uniform mat3 uYuvToRgbColorTransform;
+uniform mat4 uRgbMatrix;
 // C.java#ColorTransfer value.
 uniform int uEotfColorTransfer;
 in vec2 vTexSamplingCoord;
@@ -101,5 +103,5 @@ vec3 yuvToRgb(vec3 yuv) {
 void main() {
   vec3 srcYuv = texture(uTexSampler, vTexSamplingCoord).xyz;
   vec3 rgb = yuvToRgb(srcYuv);
-  outColor = vec4(getOpticalColor(rgb), 1.0);
+  outColor = uRgbMatrix * vec4(getOpticalColor(rgb), 1.0);
 }

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/FinalMatrixTransformationProcessorWrapper.java

@@ -66,6 +66,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
   private final Context context;
   private final ImmutableList<GlMatrixTransformation> matrixTransformations;
+  private final ImmutableList<RgbMatrix> rgbMatrices;
   private final EGLDisplay eglDisplay;
   private final EGLContext eglContext;
   private final DebugViewProvider debugViewProvider;
@@ -100,6 +101,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
       EGLDisplay eglDisplay,
       EGLContext eglContext,
       ImmutableList<GlMatrixTransformation> matrixTransformations,
+      ImmutableList<RgbMatrix> rgbMatrices,
       FrameProcessor.Listener frameProcessorListener,
       DebugViewProvider debugViewProvider,
       boolean sampleFromExternalTexture,
@@ -107,6 +109,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
       boolean releaseFramesAutomatically) {
     this.context = context;
     this.matrixTransformations = matrixTransformations;
+    this.rgbMatrices = rgbMatrices;
     this.eglDisplay = eglDisplay;
     this.eglContext = eglContext;
     this.debugViewProvider = debugViewProvider;
@@ -374,11 +377,11 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
     if (sampleFromExternalTexture) {
       matrixTransformationProcessor =
           MatrixTransformationProcessor.createWithExternalSamplerApplyingEotfThenOetf(
-              context, expandedMatrixTransformations, colorInfo);
+              context, expandedMatrixTransformations, rgbMatrices, colorInfo);
     } else {
       matrixTransformationProcessor =
           MatrixTransformationProcessor.createApplyingOetf(
-              context, expandedMatrixTransformations, colorInfo);
+              context, expandedMatrixTransformations, rgbMatrices, colorInfo);
     }
 
     matrixTransformationProcessor.setTextureTransformMatrix(textureTransformMatrix);

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/GlEffectsFrameProcessor.java

@@ -182,8 +182,7 @@ public final class GlEffectsFrameProcessor implements FrameProcessor {
         new ImmutableList.Builder<>();
     ImmutableList.Builder<GlMatrixTransformation> matrixTransformationListBuilder =
         new ImmutableList.Builder<>();
-    ImmutableList.Builder<RgbMatrix> rgbaMatrixTransformationListBuilder =
-        new ImmutableList.Builder<>();
+    ImmutableList.Builder<RgbMatrix> rgbMatrixListBuilder = new ImmutableList.Builder<>();
     boolean sampleFromExternalTexture = true;
     for (int i = 0; i < effects.size(); i++) {
       Effect effect = effects.get(i);
@@ -198,62 +197,39 @@ public final class GlEffectsFrameProcessor implements FrameProcessor {
         continue;
       }
       if (glEffect instanceof RgbMatrix) {
-        rgbaMatrixTransformationListBuilder.add((RgbMatrix) glEffect);
+        rgbMatrixListBuilder.add((RgbMatrix) glEffect);
         continue;
       }
       ImmutableList<GlMatrixTransformation> matrixTransformations =
           matrixTransformationListBuilder.build();
-      if (!matrixTransformations.isEmpty() || sampleFromExternalTexture) {
+      ImmutableList<RgbMatrix> rgbMatrices = rgbMatrixListBuilder.build();
+      if (!matrixTransformations.isEmpty() || !rgbMatrices.isEmpty() || sampleFromExternalTexture) {
         MatrixTransformationProcessor matrixTransformationProcessor;
         if (sampleFromExternalTexture) {
           matrixTransformationProcessor =
               MatrixTransformationProcessor.createWithExternalSamplerApplyingEotf(
-                  context, matrixTransformations, colorInfo);
+                  context, matrixTransformations, rgbMatrices, colorInfo);
         } else {
           matrixTransformationProcessor =
               MatrixTransformationProcessor.create(
-                  context, matrixTransformations, ColorInfo.isTransferHdr(colorInfo));
+                  context, matrixTransformations, rgbMatrices, ColorInfo.isTransferHdr(colorInfo));
         }
         textureProcessorListBuilder.add(matrixTransformationProcessor);
         matrixTransformationListBuilder = new ImmutableList.Builder<>();
+        rgbMatrixListBuilder = new ImmutableList.Builder<>();
         sampleFromExternalTexture = false;
       }
-      ImmutableList<RgbMatrix> rgbaMatrixTransformations =
-          rgbaMatrixTransformationListBuilder.build();
-      if (!rgbaMatrixTransformations.isEmpty()) {
-        textureProcessorListBuilder.add(
-            new RgbMatrixProcessor(
-                context, rgbaMatrixTransformations, ColorInfo.isTransferHdr(colorInfo)));
-        rgbaMatrixTransformationListBuilder = new ImmutableList.Builder<>();
-      }
       textureProcessorListBuilder.add(
           glEffect.toGlTextureProcessor(context, ColorInfo.isTransferHdr(colorInfo)));
     }
 
-    ImmutableList<RgbMatrix> rgbaMatrixTransformations =
-        rgbaMatrixTransformationListBuilder.build();
-    if (!rgbaMatrixTransformations.isEmpty()) {
-      // Add a MatrixTransformationProcessor if none yet exists for sampling from an external
-      // texture.
-      if (sampleFromExternalTexture) {
-        // TODO(b/239757183): Remove the unnecessary MatrixTransformationProcessor after it got
-        // merged with RgbMatrixProcessor.
-        textureProcessorListBuilder.add(
-            MatrixTransformationProcessor.createWithExternalSamplerApplyingEotf(
-                context, /* matrixTransformations= */ ImmutableList.of(), colorInfo));
-        sampleFromExternalTexture = false;
-      }
-      textureProcessorListBuilder.add(
-          new RgbMatrixProcessor(
-              context, rgbaMatrixTransformations, ColorInfo.isTransferHdr(colorInfo)));
-    }
-
     textureProcessorListBuilder.add(
         new FinalMatrixTransformationProcessorWrapper(
             context,
             eglDisplay,
             eglContext,
             matrixTransformationListBuilder.build(),
+            rgbMatrixListBuilder.build(),
             listener,
             debugViewProvider,
             sampleFromExternalTexture,

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/GlMatrixTransformation.java

@@ -54,6 +54,9 @@ public interface GlMatrixTransformation extends GlEffect {
   default SingleFrameGlTextureProcessor toGlTextureProcessor(Context context, boolean useHdr)
       throws FrameProcessingException {
     return MatrixTransformationProcessor.create(
-        context, /* matrixTransformations= */ ImmutableList.of(this), useHdr);
+        context,
+        /* matrixTransformations= */ ImmutableList.of(this),
+        /* rgbMatrices= */ ImmutableList.of(),
+        useHdr);
   }
 }

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/RgbFilter.java

@@ -20,6 +20,7 @@ import static com.google.android.exoplayer2.util.Assertions.checkState;
 
 import android.content.Context;
 import androidx.media3.common.FrameProcessingException;
+import com.google.common.collect.ImmutableList;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 
 /** Provides common color filters. */
@@ -89,9 +90,13 @@ public class RgbFilter implements RgbMatrix {
   }
 
   @Override
-  public RgbMatrixProcessor toGlTextureProcessor(Context context, boolean useHdr)
+  public MatrixTransformationProcessor toGlTextureProcessor(Context context, boolean useHdr)
       throws FrameProcessingException {
     checkForConsistentHdrSetting(useHdr);
-    return new RgbMatrixProcessor(context, /* rgbMatrix= */ this, useHdr);
+    return MatrixTransformationProcessor.create(
+        context,
+        /* matrixTransformations= */ ImmutableList.of(),
+        /* rgbMatrices= */ ImmutableList.of(this),
+        useHdr);
   }
 }

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/RgbMatrix.java

@@ -18,6 +18,7 @@ package androidx.media3.effect;
 
 import android.content.Context;
 import androidx.media3.common.FrameProcessingException;
+import com.google.common.collect.ImmutableList;
 
 /**
  * Specifies a 4x4 RGB color transformation matrix to apply to each frame in the fragment shader.
@@ -37,8 +38,12 @@ public interface RgbMatrix extends GlEffect {
   float[] getMatrix(long presentationTimeUs, boolean useHdr);
 
   @Override
-  default RgbMatrixProcessor toGlTextureProcessor(Context context, boolean useHdr)
+  default MatrixTransformationProcessor toGlTextureProcessor(Context context, boolean useHdr)
       throws FrameProcessingException {
-    return new RgbMatrixProcessor(context, /* rgbMatrix= */ this, useHdr);
+    return MatrixTransformationProcessor.create(
+        context,
+        /* matrixTransformations= */ ImmutableList.of(),
+        /* rgbMatrices= */ ImmutableList.of(this),
+        useHdr);
   }
 }

google3/third_party/java_src/android_libs/media/libraries/effect/src/main/java/androidx/media3/effect/RgbMatrixProcessor.java

-/*
- * Copyright 2022 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 androidx.media3.effect;
-
-import android.content.Context;
-import android.opengl.GLES20;
-import android.opengl.Matrix;
-import android.util.Pair;
-import androidx.media3.common.FrameProcessingException;
-import com.google.android.exoplayer2.util.GlProgram;
-import com.google.android.exoplayer2.util.GlUtil;
-import com.google.common.collect.ImmutableList;
-import java.io.IOException;
-
-/**
- * Applies a sequence of {@link RgbMatrix} to each frame.
- *
- * <p>After applying all {@link RgbMatrix} instances, color values are clamped to the limits of the
- * color space. Intermediate results are not clamped.
- */
-/* package */ final class RgbMatrixProcessor extends SingleFrameGlTextureProcessor {
-  private static final String VERTEX_SHADER_PATH = "shaders/vertex_shader_transformation_es2.glsl";
-  private static final String FRAGMENT_SHADER_PATH =
-      "shaders/fragment_shader_transformation_es2.glsl";
-
-  private final GlProgram glProgram;
-  private final ImmutableList<RgbMatrix> rgbMatrices;
-  private final boolean useHdr;
-
-  // TODO(b/239757183): Merge RgbMatrixProcessor with MatrixTransformationProcessor.
-  /**
-   * Creates a new instance.
-   *
-   * @param context The {@link Context}.
-   * @param rgbMatrix The {@link RgbMatrix} to apply to each frame.
-   * @param useHdr Whether input textures come from an HDR source. If {@code true}, colors will be
-   *     in linear RGB BT.2020. If {@code false}, colors will be in gamma RGB BT.709.
-   * @throws FrameProcessingException If a problem occurs while reading shader files or an OpenGL
-   *     operation fails or is unsupported.
-   */
-  public RgbMatrixProcessor(Context context, RgbMatrix rgbMatrix, boolean useHdr)
-      throws FrameProcessingException {
-    this(context, ImmutableList.of(rgbMatrix), useHdr);
-  }
-
-  /**
-   * Creates a new instance.
-   *
-   * @param context The {@link Context}.
-   * @param rgbMatrices The {@link RgbMatrix} to apply to each frame.
-   * @param useHdr Whether input textures come from an HDR source. If {@code true}, colors will be
-   *     in linear RGB BT.2020. If {@code false}, colors will be in gamma RGB BT.709.
-   * @throws FrameProcessingException If a problem occurs while reading shader files or an OpenGL
-   *     operation fails or is unsupported.
-   */
-  public RgbMatrixProcessor(Context context, ImmutableList<RgbMatrix> rgbMatrices, boolean useHdr)
-      throws FrameProcessingException {
-    super(useHdr);
-    this.rgbMatrices = rgbMatrices;
-    this.useHdr = useHdr;
-
-    try {
-      glProgram = new GlProgram(context, VERTEX_SHADER_PATH, FRAGMENT_SHADER_PATH);
-    } catch (IOException | GlUtil.GlException e) {
-      throw new FrameProcessingException(e);
-    }
-
-    // Draw the frame on the entire normalized device coordinate space, from -1 to 1, for x and y.
-    glProgram.setBufferAttribute(
-        "aFramePosition",
-        GlUtil.getNormalizedCoordinateBounds(),
-        GlUtil.HOMOGENEOUS_COORDINATE_VECTOR_SIZE);
-
-    float[] identityMatrix = new float[16];
-    Matrix.setIdentityM(identityMatrix, /* smOffset= */ 0);
-    glProgram.setFloatsUniform("uTransformationMatrix", identityMatrix);
-    glProgram.setFloatsUniform("uTexTransformationMatrix", identityMatrix);
-  }
-
-  @Override
-  public Pair<Integer, Integer> configure(int inputWidth, int inputHeight) {
-    return Pair.create(inputWidth, inputHeight);
-  }
-
-  private static float[] createCompositeRgbaMatrixArray(
-      ImmutableList<RgbMatrix> rgbMatrices, boolean useHdr, long presentationTimeUs) {
-    float[] tempResultMatrix = new float[16];
-    float[] compositeRgbaMatrix = new float[16];
-    Matrix.setIdentityM(compositeRgbaMatrix, /* smOffset= */ 0);
-
-    for (int i = 0; i < rgbMatrices.size(); i++) {
-      Matrix.multiplyMM(
-          /* result= */ tempResultMatrix,
-          /* resultOffset= */ 0,
-          /* lhs= */ rgbMatrices.get(i).getMatrix(presentationTimeUs, useHdr),
-          /* lhsOffset= */ 0,
-          /* rhs= */ compositeRgbaMatrix,
-          /* rhsOffset= */ 0);
-      System.arraycopy(
-          /* src= */ tempResultMatrix,
-          /* srcPos= */ 0,
-          /* dest= */ compositeRgbaMatrix,
-          /* destPost= */ 0,
-          /* length= */ tempResultMatrix.length);
-    }
-
-    return compositeRgbaMatrix;
-  }
-
-  @Override
-  public void drawFrame(int inputTexId, long presentationTimeUs) throws FrameProcessingException {
-    // TODO(b/239431666): Add caching for compacting Matrices.
-    float[] rgbMatrixArray =
-        createCompositeRgbaMatrixArray(rgbMatrices, useHdr, presentationTimeUs);
-    try {
-      glProgram.use();
-      glProgram.setSamplerTexIdUniform("uTexSampler", inputTexId, /* texUnitIndex= */ 0);
-      glProgram.setFloatsUniform("uColorMatrix", rgbMatrixArray);
-      glProgram.bindAttributesAndUniforms();
-
-      // The four-vertex triangle strip forms a quad.
-      GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /* first= */ 0, /* count= */ 4);
-    } catch (GlUtil.GlException e) {
-      throw new FrameProcessingException(e, presentationTimeUs);
-    }
-  }
-
-  @Override
-  public void release() throws FrameProcessingException {
-    super.release();
-    try {
-      glProgram.delete();
-    } catch (GlUtil.GlException e) {
-      throw new FrameProcessingException(e);
-    }
-  }
-}