1 files changed, 74 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/wallpapers/photophase/effects/OutlineEffect.java b/src/org/cyanogenmod/wallpapers/photophase/effects/OutlineEffect.java
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+++ b/src/org/cyanogenmod/wallpapers/photophase/effects/OutlineEffect.java
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+/*
+ * 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 on the shaders of kodemongki:
+//   http://kodemongki.blogspot.com.es/2011/06/kameraku-custom-shader-effects-example.html
+//
+
+package org.cyanogenmod.wallpapers.photophase.effects;
+
+import android.media.effect.EffectContext;
+
+/**
+ * An outline effect (highlight edges)<br/>
+ * <table>
+ * <tr><td>Parameter name</td><td>Meaning</td><td>Valid values</td></tr>
+ * </table>
+ */
+public class OutlineEffect extends PhotoPhaseEffect {
+
+    private static final String FRAGMENT_SHADER =
+            "precision mediump float;\n" +
+            "uniform sampler2D tex_sampler;\n" +
+            "varying vec2 v_texcoord;\n" +
+            "const float step_w = 0.0015625;\n" +
+            "const float step_h = 0.0027778;\n" +
+            "void main(void)\n" +
+            "{\n" +
+            "    vec3 t1 = texture2D(tex_sampler, vec2(v_texcoord.x - step_w, v_texcoord.y - step_h)).bgr;\n" +
+            "    vec3 t2 = texture2D(tex_sampler, vec2(v_texcoord.x, v_texcoord.y - step_h)).bgr;\n" +
+            "    vec3 t3 = texture2D(tex_sampler, vec2(v_texcoord.x + step_w, v_texcoord.y - step_h)).bgr;\n" +
+            "    vec3 t4 = texture2D(tex_sampler, vec2(v_texcoord.x - step_w, v_texcoord.y)).bgr;\n" +
+            "    vec3 t5 = texture2D(tex_sampler, v_texcoord).bgr;\n" +
+            "    vec3 t6 = texture2D(tex_sampler, vec2(v_texcoord.x + step_w, v_texcoord.y)).bgr;\n" +
+            "    vec3 t7 = texture2D(tex_sampler, vec2(v_texcoord.x - step_w, v_texcoord.y + step_h)).bgr;\n" +
+            "    vec3 t8 = texture2D(tex_sampler, vec2(v_texcoord.x, v_texcoord.y + step_h)).bgr;\n" +
+            "    vec3 t9 = texture2D(tex_sampler, vec2(v_texcoord.x + step_w, v_texcoord.y + step_h)).bgr;\n" +
+            "    vec3 xx= t1 + 2.0*t2 + t3 - t7 - 2.0*t8 - t9;\n" +
+            "    vec3 yy = t1 - t3 + 2.0*t4 - 2.0*t6 + t7 - t9;\n" +
+            "    vec3 rr = sqrt(xx * xx + yy * yy);\n" +
+            "    float y = (rr.r + rr.g + rr.b) / 3.0;\n" +
+            "    if (y > 0.2)\n" +
+            "        rr = vec3(0.0, 0.0, 0.0);\n" +
+            "    else\n" +
+            "        rr = vec3(1.0, 1.0, 1.0);\n" +
+            "    gl_FragColor.a = 1.0;\n" +
+            "    gl_FragColor.rgb = rr;\n" +
+            "}";
+
+    /**
+     * Constructor of <code>OutlineEffect</code>.
+     *
+     * @param ctx The effect context
+     * @param name The effect name
+     */
+    public OutlineEffect(EffectContext ctx, String name) {
+        super(ctx, OutlineEffect.class.getName());
+        init(VERTEX_SHADER, FRAGMENT_SHADER);
+    }
+
+}