1 files changed, 89 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/ExtTexture.java b/src/com/android/gallery3d/ui/ExtTexture.java
new file mode 100644
index 000000000..e39f317a3
--- /dev/null
+++ b/src/com/android/gallery3d/ui/ExtTexture.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2012 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 com.android.gallery3d.ui;
+
+import android.graphics.SurfaceTexture;
+import javax.microedition.khronos.opengles.GL11;
+import javax.microedition.khronos.opengles.GL11Ext;
+
+// ExtTexture is a texture whose content comes from a external texture.
+// Before drawing, setSize() should be called.
+public class ExtTexture extends BasicTexture {
+
+    private static int[] sTextureId = new int[1];
+    private static float[] sCropRect = new float[4];
+    private int mTarget;
+
+    public ExtTexture(int target) {
+        GLId.glGenTextures(1, sTextureId, 0);
+        mId = sTextureId[0];
+        mTarget = target;
+    }
+
+    private void uploadToCanvas(GLCanvas canvas) {
+        GL11 gl = canvas.getGLInstance();
+
+        int width = getWidth();
+        int height = getHeight();
+        // Define a vertically flipped crop rectangle for OES_draw_texture.
+        // The four values in sCropRect are: left, bottom, width, and
+        // height. Negative value of width or height means flip.
+        sCropRect[0] = 0;
+        sCropRect[1] = height;
+        sCropRect[2] = width;
+        sCropRect[3] = -height;
+
+        // Set texture parameters.
+        gl.glBindTexture(mTarget, mId);
+        gl.glTexParameterfv(mTarget,
+                GL11Ext.GL_TEXTURE_CROP_RECT_OES, sCropRect, 0);
+        gl.glTexParameteri(mTarget,
+                GL11.GL_TEXTURE_WRAP_S, GL11.GL_CLAMP_TO_EDGE);
+        gl.glTexParameteri(mTarget,
+                GL11.GL_TEXTURE_WRAP_T, GL11.GL_CLAMP_TO_EDGE);
+        gl.glTexParameterf(mTarget,
+                GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
+        gl.glTexParameterf(mTarget,
+                GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
+
+        setAssociatedCanvas(canvas);
+        mState = UploadedTexture.STATE_LOADED;
+    }
+
+    @Override
+    protected boolean onBind(GLCanvas canvas) {
+        if (!isLoaded(canvas)) {
+            uploadToCanvas(canvas);
+        }
+
+        return true;
+    }
+
+    @Override
+    public int getTarget() {
+        return mTarget;
+    }
+
+    public boolean isOpaque() {
+        return true;
+    }
+
+    @Override
+    public void yield() {
+        // we cannot free the texture because we have no backup.
+    }
+}