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/*
* Copyright (C) 2011 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.ide.eclipse.gltrace;
import com.android.ide.eclipse.gltrace.GLProtoBuf.GLMessage;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.widgets.Display;
import org.liblzf.CLZF;
/** Utilities to deal with protobuf encoded {@link GLMessage}. */
public class ProtoBufUtils {
private static ImageData getImageData(GLMessage glMsg) {
int width = glMsg.getFb().getWidth();
int height = glMsg.getFb().getHeight();
if (width * height == 0) {
return null;
}
byte[] compressed = glMsg.getFb().getContents(0).toByteArray();
byte[] uncompressed = new byte[width * height * 4];
int size = CLZF.lzf_decompress(compressed, compressed.length,
uncompressed, uncompressed.length);
assert size == width * height * 4 : "Unexpected image size after decompression.";
int redMask = 0xff000000;
int greenMask = 0x00ff0000;
int blueMask = 0x0000ff00;
PaletteData palette = new PaletteData(redMask, greenMask, blueMask);
ImageData imageData = new ImageData(
width,
height,
32, // depth
palette,
1, // scan line padding
uncompressed);
byte[] alpha = new byte[width*height];
for (int i = 0; i < width * height; i++) {
alpha[i] = uncompressed[i * 4 + 3];
}
imageData.alphaData = alpha;
imageData = imageData.scaledTo(imageData.width, -imageData.height);
return imageData;
}
/** Obtains the image stored in provided protocol buffer message. */
public static Image getImage(Display display, GLMessage glMsg) {
if (!glMsg.hasFb()) {
return null;
}
ImageData imageData = null;
try {
imageData = getImageData(glMsg);
} catch (Exception e) {
GlTracePlugin.getDefault().logMessage(
"Unexpected error while retrieving framebuffer image: " + e);
return null;
}
if (imageData == null) {
return null;
}
return new Image(display, imageData);
}
}
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