Add GPUImageColorInvertFilter implementation

swcai · swcai · commit da18ff5af43b · 2013-01-06T11:11:45.000+08:00
Signed-off-by: Wenwei Cai &lt;stanley.w.cai@gmail.com&gt;
diff --git a/library/src/jp/co/cyberagent/android/gpuimage/GPUImageColorInvertFilter.java b/library/src/jp/co/cyberagent/android/gpuimage/GPUImageColorInvertFilter.java
@@ -0,0 +1,24 @@
+package jp.co.cyberagent.android.gpuimage;
+
+import android.opengl.GLES20;
+
+/**
+ * Invert all the colors in the image.
+ */
+public class GPUImageColorInvertFilter extends GPUImageFilter {
+    public static final String COLOR_INVERT_FRAGMENT_SHADER = "" +
+            "varying highp vec2 textureCoordinate;\n" +
+            "\n" +
+            "uniform sampler2D inputImageTexture;\n" +
+            "\n" +
+            "void main()\n" +
+            "{\n" +
+            "    lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);\n" +
+            "    \n" +
+            "    gl_FragColor = vec4((1.0 - textureColor.rgb), textureColor.w);\n" +
+            "}";
+
+    public GPUImageColorInvertFilter() {
+        super(NO_FILTER_VERTEX_SHADER, COLOR_INVERT_FRAGMENT_SHADER);
+    }
+}
diff --git a/sample/src/jp/co/cyberagent/android/gpuimage/sample/GPUImageFilterTools.java b/sample/src/jp/co/cyberagent/android/gpuimage/sample/GPUImageFilterTools.java
@@ -33,6 +33,7 @@
 import jp.co.cyberagent.android.gpuimage.GPUImageSepiaFilter;
 import jp.co.cyberagent.android.gpuimage.GPUImageSharpenFilter;
 import jp.co.cyberagent.android.gpuimage.GPUImageSobelEdgeDetection;
+import jp.co.cyberagent.android.gpuimage.GPUImageColorInvertFilter;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -42,6 +43,7 @@ public static void showDialog(final Context context,
             final OnGpuImageFilterChosenListener listener) {
         final FilterList filters = new FilterList();
         filters.addFilter("Contrast", FilterType.CONTRAST);
+        filters.addFilter("Invert", FilterType.INVERT);
         filters.addFilter("Gamma", FilterType.GAMMA);
         filters.addFilter("Brightness", FilterType.BRIGHTNESS);
         filters.addFilter("Sepia", FilterType.SEPIA);
@@ -72,6 +74,8 @@ private static GPUImageFilter createFilterForType(final Context context, final F
                 return new GPUImageContrastFilter(2.0f);
             case GAMMA:
                 return new GPUImageGammaFilter(2.0f);
+            case INVERT:
+                return new GPUImageColorInvertFilter();
             case BRIGHTNESS:
                 return new GPUImageBrightnessFilter(1.5f);
             case GRAYSCALE:
@@ -113,7 +117,7 @@ public interface OnGpuImageFilterChosenListener {
     }
 
     private enum FilterType {
-        CONTRAST, GRAYSCALE, SHARPEN, SEPIA, SOBEL_EDGE_DETECTION, THREE_X_THREE_CONVOLUTION, FILTER_GROUP, EMBOSS, POSTERIZE, GAMMA, BRIGHTNESS,
+        CONTRAST, GRAYSCALE, SHARPEN, SEPIA, SOBEL_EDGE_DETECTION, THREE_X_THREE_CONVOLUTION, FILTER_GROUP, EMBOSS, POSTERIZE, GAMMA, BRIGHTNESS, INVERT,
     }
 
     private static class FilterList {
