Support for MCA own effects + Halftone effects

Signed-off-by: Jorge Ruesga <jorge@ruesga.com>

4 files changed, 388 insertions, 0 deletions

diff --git a/src/org/cyanogenmod/wallpapers/photophase/effects/Effects.java b/src/org/cyanogenmod/wallpapers/photophase/effects/Effects.java
index 04866c0..cf9ff79 100644
--- a/src/org/cyanogenmod/wallpapers/photophase/effects/Effects.java
+++ b/src/org/cyanogenmod/wallpapers/photophase/effects/Effects.java
@@ -52,6 +52,10 @@ public class Effects {
          */
         DOCUMENTARY,
         /**
+         * @see PhotoPhaseEffectFactory#EFFECT_HALFTONE
+         */
+        HALFTONE,
+        /**
          * @see EffectFactory#EFFECT_DUOTONE
          */
         DUOTONE,
@@ -156,6 +160,11 @@ public class Effects {
             if (EffectFactory.isEffectSupported(EffectFactory.EFFECT_DOCUMENTARY)) {
                 effect = effectFactory.createEffect(EffectFactory.EFFECT_DOCUMENTARY);
             }
+        } else if (nextEffect.compareTo(EFFECTS.HALFTONE) == 0) {
+            if (EffectFactory.isEffectSupported(PhotoPhaseEffectFactory.EFFECT_HALFTONE)) {
+                effect = effectFactory.createEffect(PhotoPhaseEffectFactory.EFFECT_HALFTONE);
+                effect.setParameter("strength", 30.0f);
+            }
         } else if (nextEffect.compareTo(EFFECTS.DUOTONE) == 0) {
             if (EffectFactory.isEffectSupported(EffectFactory.EFFECT_DUOTONE)) {
                 effect = effectFactory.createEffect(EffectFactory.EFFECT_DUOTONE);
diff --git a/src/org/cyanogenmod/wallpapers/photophase/effects/HalftoneEffect.java b/src/org/cyanogenmod/wallpapers/photophase/effects/HalftoneEffect.java
new file mode 100644
index 0000000..b09696f
--- /dev/null
+++ b/src/org/cyanogenmod/wallpapers/photophase/effects/HalftoneEffect.java
@@ -0,0 +1,218 @@
+/*
+ * Copyright (C) 2008 Max Maischein
+ * Copyright (C) 2013 The CyanogenMod 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.
+ */
+//
+// Based in the shaders of Max Maischein of App-VideoMixer:
+//   http://cpansearch.perl.org/src/CORION/App-VideoMixer-0.02/filters/halftone.glsl
+//
+
+package org.cyanogenmod.wallpapers.photophase.effects;
+
+import android.media.effect.EffectContext;
+import android.opengl.GLES20;
+import android.util.Log;
+
+import org.cyanogenmod.wallpapers.photophase.utils.GLESUtil;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+
+/**
+ * A halftone effect<br/>
+ * <table>
+ * <tr><td>Parameter name</td><td>Meaning</td><td>Valid values</td></tr>
+ * <tr>
+ *   <td><code>strength</code></td>
+ *   <td>The halftone steps multiplier.</td>
+ *   <td>Positive float (>0). Higher numbers produce smallest points;</td>
+ * </tr>
+ * </table>
+ */
+public class HalftoneEffect extends PhotoPhaseEffect {
+
+    private static final String TAG = "HalftoneEffect";
+
+    /**
+     * The halftone steps multiplier parameter key
+     */
+    public static final String STRENGTH_PARAMETER = "strength";
+
+    private static final int FLOAT_SIZE_BYTES = 4;
+
+    private static final String VERTEX_SHADER =
+            "attribute vec4 a_position;\n" +
+            "attribute vec2 a_texcoord;\n" +
+            "varying vec2 v_texcoord;\n" +
+            "void main() {\n" +
+            "  gl_Position = vec4(a_position.xy, 0.0, 1.0);\n" +
+            "  gl_Position = sign(gl_Position);\n" +
+            "  v_texcoord = a_texcoord;\n" +
+            "}\n";
+    private static final String FRAGMENT_SHADER =
+            "precision mediump float;\n" +
+            "uniform sampler2D tex_sampler;\n" +
+            "varying vec2 v_texcoord;\n" +
+            "uniform float steps\n;" +
+            "float dotsize = 1.0 / steps ;\n" +
+            "float half_step = dotsize / 2.0;\n" +
+            "void main() {\n" +
+            "    vec2 center = v_texcoord - vec2(mod(v_texcoord.x, dotsize),mod(v_texcoord.y, dotsize)) + half_step;\n" +
+            "    vec4 pel = texture2D( tex_sampler, center);\n" +
+            "    float size = length(pel);\n" +
+            "    if (distance(v_texcoord,center) <= dotsize*size/4.0) {\n" +
+            "       gl_FragColor = pel;\n" +
+            "    } else {\n" +
+            "       gl_FragColor = vec4(0.0,0.0,0.0,0.0);\n" +
+            "    };\n" +
+            "}\n";
+
+    private static final float[] TEX_VERTICES = {0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f};
+    private static final float[] POS_VERTICES = {-1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f};
+
+    private float mStrength = 32.0f;
+
+    private int mProgram;
+    private int mTexSamplerHandle;
+    private int mTexCoordHandle;
+    private int mPosCoordHandle;
+    private int mStepsHandle;
+
+    private FloatBuffer mTexVertices;
+    private FloatBuffer mPosVertices;
+
+    /**
+     * An abstract contructor of <code>Effect</code> to follow the rules
+     * defined by {@see EffectFactory}.
+     *
+     * @param ctx The effect context
+     * @param name The effect name
+     */
+    public HalftoneEffect(EffectContext ctx, String name) {
+        super(ctx, HalftoneEffect.class.getName());
+        init();
+    }
+
+    /**
+     * Method that initializes the effect
+     */
+    private void init() {
+        // Create program
+        mProgram = GLESUtil.createProgram(VERTEX_SHADER, FRAGMENT_SHADER);
+
+        // Bind attributes and uniforms
+        mTexSamplerHandle = GLES20.glGetUniformLocation(mProgram, "tex_sampler");
+        GLESUtil.glesCheckError("glGetUniformLocation");
+        mTexCoordHandle = GLES20.glGetAttribLocation(mProgram, "a_texcoord");
+        GLESUtil.glesCheckError("glGetAttribLocation");
+        mPosCoordHandle = GLES20.glGetAttribLocation(mProgram, "a_position");
+        GLESUtil.glesCheckError("glGetAttribLocation");
+        mStepsHandle = GLES20.glGetUniformLocation(mProgram, "steps");
+        GLESUtil.glesCheckError("glGetUniformLocation");
+
+        // Setup coordinate buffers
+        mTexVertices = ByteBuffer.allocateDirect(
+                TEX_VERTICES.length * FLOAT_SIZE_BYTES)
+                .order(ByteOrder.nativeOrder()).asFloatBuffer();
+        mTexVertices.put(TEX_VERTICES).position(0);
+        mPosVertices = ByteBuffer.allocateDirect(
+                POS_VERTICES.length * FLOAT_SIZE_BYTES)
+                .order(ByteOrder.nativeOrder()).asFloatBuffer();
+        mPosVertices.put(POS_VERTICES).position(0);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    void apply(int inputTexId) {
+        // Use our shader program
+        GLES20.glUseProgram(mProgram);
+        GLESUtil.glesCheckError("glUseProgram");
+
+        // Disable blending
+        GLES20.glDisable(GLES20.GL_BLEND);
+        GLESUtil.glesCheckError("glDisable");
+
+        // Set the vertex attributes
+        GLES20.glVertexAttribPointer(mTexCoordHandle, 2, GLES20.GL_FLOAT, false, 0, mTexVertices);
+        GLESUtil.glesCheckError("glVertexAttribPointer");
+        GLES20.glEnableVertexAttribArray(mTexCoordHandle);
+        GLESUtil.glesCheckError("glEnableVertexAttribArray");
+        GLES20.glVertexAttribPointer(mPosCoordHandle, 2, GLES20.GL_FLOAT, false, 0, mPosVertices);
+        GLESUtil.glesCheckError("glVertexAttribPointer");
+        GLES20.glEnableVertexAttribArray(mPosCoordHandle);
+        GLESUtil.glesCheckError("glEnableVertexAttribArray");
+
+        // Set parameters
+        GLES20.glUniform1f(mStepsHandle, mStrength);
+        GLESUtil.glesCheckError("glUniform1f");
+
+        // Set the input texture
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, inputTexId);
+        GLESUtil.glesCheckError("glBindTexture");
+        GLES20.glUniform1i(mTexSamplerHandle, 0);
+        GLESUtil.glesCheckError("glUniform1i");
+
+        // Draw
+        GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+        GLESUtil.glesCheckError("glClearColor");
+        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
+        GLESUtil.glesCheckError("glClear");
+        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
+        GLESUtil.glesCheckError("glDrawArrays");
+
+        // Disable attributes
+        GLES20.glDisableVertexAttribArray(mTexCoordHandle);
+        GLESUtil.glesCheckError("glDisableVertexAttribArray");
+        GLES20.glDisableVertexAttribArray(mPosCoordHandle);
+        GLESUtil.glesCheckError("glDisableVertexAttribArray");
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void setParameter(String parameterKey, Object value) {
+        if (parameterKey.compareTo(STRENGTH_PARAMETER) == 0) {
+            try {
+                float strength = Float.parseFloat(value.toString());
+                if (strength <= 0) {
+                    Log.w(TAG, "strength parameter must be >= 0");
+                    return;
+                }
+                mStrength = strength;
+            } catch (NumberFormatException ex) {
+                // Ignore
+            }
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void release() {
+        if (GLES20.glIsProgram(mProgram)) {
+            GLES20.glDeleteProgram(mProgram);
+            GLESUtil.glesCheckError("glDeleteProgram");
+        }
+        mTexVertices = null;
+        mPosVertices = null;
+    }
+
+}
diff --git a/src/org/cyanogenmod/wallpapers/photophase/effects/PhotoPhaseEffect.java b/src/org/cyanogenmod/wallpapers/photophase/effects/PhotoPhaseEffect.java
new file mode 100644
index 0000000..83f461d
--- /dev/null
+++ b/src/org/cyanogenmod/wallpapers/photophase/effects/PhotoPhaseEffect.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2013 The CyanogenMod 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 org.cyanogenmod.wallpapers.photophase.effects;
+
+import android.media.effect.Effect;
+import android.media.effect.EffectContext;
+import android.opengl.GLES20;
+import android.opengl.GLUtils;
+
+import org.cyanogenmod.wallpapers.photophase.utils.GLESUtil;
+
+import java.nio.IntBuffer;
+
+/**
+ * An abstract class definition for all the PhotoPhase custom effects
+ */
+public abstract class PhotoPhaseEffect extends Effect {
+
+    private final EffectContext mEffectContext;
+    private final String mName;
+
+    /**
+     * An abstract contructor of <code>Effect</code> to follow the rules
+     * defined by {@see EffectFactory}.
+     *
+     * @param ctx The effect context
+     * @param name The effect name
+     */
+    public PhotoPhaseEffect(EffectContext ctx, String name) {
+        super();
+        mEffectContext = ctx;
+        mName = name;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String getName() {
+        return mName;
+    }
+
+    /**
+     * Method that returns the effect context
+     *
+     * @return EffectContext The effect context
+     */
+    public EffectContext getEffectContext() {
+        return mEffectContext;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public final void apply(int inputTexId, int width, int height, int outputTexId) {
+        // Create a framebuffer object and call the effect apply method to draw the effect
+        int[] fb = new int[1];
+        GLES20.glGenFramebuffers(1, fb, 0);
+        GLESUtil.glesCheckError("glGenFramebuffers");
+        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fb[0]);
+        GLESUtil.glesCheckError("glBindFramebuffer");
+
+        // Render on the whole framebuffer,
+        GLES20.glViewport(0, 0, width, height);
+        GLESUtil.glesCheckError("glViewport");
+
+        // Create a new output texturure
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, outputTexId);
+        GLESUtil.glesCheckError("glBindTexture");
+        IntBuffer texBuffer = IntBuffer.wrap(new int[width * height]);
+        GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGB, width, height, 0, GLES20.GL_RGB, GLES20.GL_UNSIGNED_BYTE, texBuffer);
+        GLESUtil.glesCheckError("glTexImage2D");
+
+        // Set the
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
+        GLESUtil.glesCheckError("glTexParameteri");
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
+        GLESUtil.glesCheckError("glTexParameteri");
+
+        // Create the framebuffer
+        GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20. GL_TEXTURE_2D, outputTexId, 0);
+        GLESUtil.glesCheckError("glFramebufferTexture2D");
+
+        // Check if the buffer was built successfully
+        if (GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER) != GLES20.GL_FRAMEBUFFER_COMPLETE) {
+            // Something when wrong. Throw an exception
+            GLESUtil.glesCheckError("glCheckFramebufferStatus");
+            int error = GLES20.glGetError();
+            throw new android.opengl.GLException(error, GLUtils.getEGLErrorString(error));
+        }
+
+        // Bind the framebuffer
+        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fb[0]);
+
+        // Apply the effect
+        apply(inputTexId);
+
+        // Unbind the framebuffer
+        GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
+    }
+
+    /**
+     * Method that applies the effect.
+     *
+     *  @param inputTexId The input texture
+     */
+    abstract void apply(int inputTexId);
+}
diff --git a/src/org/cyanogenmod/wallpapers/photophase/effects/PhotoPhaseEffectFactory.java b/src/org/cyanogenmod/wallpapers/photophase/effects/PhotoPhaseEffectFactory.java
new file mode 100644
index 0000000..eaa5f32
--- /dev/null
+++ b/src/org/cyanogenmod/wallpapers/photophase/effects/PhotoPhaseEffectFactory.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2013 The CyanogenMod 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 org.cyanogenmod.wallpapers.photophase.effects;
+
+/**
+ * A class that defines the own PhotoPhase's effects implementation. This class follows the
+ * rules of the MCA aosp library.
+ */
+public class PhotoPhaseEffectFactory {
+
+    /**
+     * <p>Applies halftone effect to the image.</p>
+     * <p>Available parameters:</p>
+     * <table>
+     * <tr><td>Parameter name</td><td>Meaning</td><td>Valid values</td></tr>
+     * <tr>
+     *   <td><code>strength</code></td>
+     *   <td>The halftone steps multiplier.</td>
+     *   <td>Positive float (>0). Higher numbers produce smallest points;</td>
+     * </tr>
+     * </table>
+     */
+    public static final String EFFECT_HALFTONE = "org.cyanogenmod.wallpapers.photophase.effects.HalftoneEffect";
+}