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A library jar that provides APIs for Applications written for the Google Android Platform.
/*
* Copyright 2015 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 android.media;
import android.graphics.ImageFormat;
import android.graphics.PixelFormat;
import android.media.Image.Plane;
import android.util.Size;
import libcore.io.Memory;
import java.nio.ByteBuffer;
/**
* Package private utility class for hosting commonly used Image related methods.
*/
class ImageUtils {
/**
* Only a subset of the formats defined in
* {@link android.graphics.ImageFormat ImageFormat} and
* {@link android.graphics.PixelFormat PixelFormat} are supported by
* ImageReader. When reading RGB data from a surface, the formats defined in
* {@link android.graphics.PixelFormat PixelFormat} can be used; when
* reading YUV, JPEG or raw sensor data (for example, from the camera or video
* decoder), formats from {@link android.graphics.ImageFormat ImageFormat}
* are used.
*/
public static int getNumPlanesForFormat(int format) {
switch (format) {
case ImageFormat.YV12:
case ImageFormat.YUV_420_888:
case ImageFormat.NV21:
return 3;
case ImageFormat.NV16:
return 2;
case PixelFormat.RGB_565:
case PixelFormat.RGBA_8888:
case PixelFormat.RGBX_8888:
case PixelFormat.RGB_888:
case ImageFormat.JPEG:
case ImageFormat.YUY2:
case ImageFormat.Y8:
case ImageFormat.Y16:
case ImageFormat.RAW_SENSOR:
case ImageFormat.RAW10:
return 1;
case ImageFormat.PRIVATE:
return 0;
default:
throw new UnsupportedOperationException(
String.format("Invalid format specified %d", format));
}
}
/**
*
* Copy source image data to destination Image.
*
*
* Only support the copy between two non-{@link ImageFormat#PRIVATE PRIVATE} format
* images with same properties (format, size, etc.). The data from the
* source image will be copied to the byteBuffers from the destination Image
* starting from position zero, and the destination image will be rewound to
* zero after copy is done.
*
*
* @param src The source image to be copied from.
* @param dst The destination image to be copied to.
* @throws IllegalArgumentException If the source and destination images
* have different format, or one of the images is not copyable.
*/
public static void imageCopy(Image src, Image dst) {
if (src == null || dst == null) {
throw new IllegalArgumentException("Images should be non-null");
}
if (src.getFormat() != dst.getFormat()) {
throw new IllegalArgumentException("Src and dst images should have the same format");
}
if (src.getFormat() == ImageFormat.PRIVATE ||
dst.getFormat() == ImageFormat.PRIVATE) {
throw new IllegalArgumentException("PRIVATE format images are not copyable");
}
if (!(dst.getOwner() instanceof ImageWriter)) {
throw new IllegalArgumentException("Destination image is not from ImageWriter. Only"
+ " the images from ImageWriter are writable");
}
Size srcSize = new Size(src.getWidth(), src.getHeight());
Size dstSize = new Size(dst.getWidth(), dst.getHeight());
if (!srcSize.equals(dstSize)) {
throw new IllegalArgumentException("source image size " + srcSize + " is different"
+ " with " + "destination image size " + dstSize);
}
Plane[] srcPlanes = src.getPlanes();
Plane[] dstPlanes = dst.getPlanes();
ByteBuffer srcBuffer = null;
ByteBuffer dstBuffer = null;
for (int i = 0; i < srcPlanes.length; i++) {
int srcRowStride = srcPlanes[i].getRowStride();
int dstRowStride = dstPlanes[i].getRowStride();
srcBuffer = srcPlanes[i].getBuffer();
dstBuffer = dstPlanes[i].getBuffer();
if (!(srcBuffer.isDirect() && dstBuffer.isDirect())) {
throw new IllegalArgumentException("Source and destination ByteBuffers must be"
+ " direct byteBuffer!");
}
if (srcPlanes[i].getPixelStride() != dstPlanes[i].getPixelStride()) {
throw new IllegalArgumentException("Source plane image pixel stride " +
srcPlanes[i].getPixelStride() +
" must be same as destination image pixel stride " +
dstPlanes[i].getPixelStride());
}
int srcPos = srcBuffer.position();
srcBuffer.rewind();
dstBuffer.rewind();
if (srcRowStride == dstRowStride) {
// Fast path, just copy the content if the byteBuffer all together.
dstBuffer.put(srcBuffer);
} else {
// Source and destination images may have different alignment requirements,
// therefore may have different strides. Copy row by row for such case.
int srcOffset = srcBuffer.position();
int dstOffset = dstBuffer.position();
Size effectivePlaneSize = getEffectivePlaneSizeForImage(src, i);
int srcByteCount = effectivePlaneSize.getWidth() * srcPlanes[i].getPixelStride();
for (int row = 0; row < effectivePlaneSize.getHeight(); row++) {
if (row == effectivePlaneSize.getHeight() - 1) {
// Special case for NV21 backed YUV420_888: need handle the last row
// carefully to avoid memory corruption. Check if we have enough bytes to
// copy.
int remainingBytes = srcBuffer.remaining() - srcOffset;
if (srcByteCount > remainingBytes) {
srcByteCount = remainingBytes;
}
}
directByteBufferCopy(srcBuffer, srcOffset, dstBuffer, dstOffset, srcByteCount);
srcOffset += srcRowStride;
dstOffset += dstRowStride;
}
}
srcBuffer.position(srcPos);
dstBuffer.rewind();
}
}
/**
* Return the estimated native allocation size in bytes based on width, height, format,
* and number of images.
*
* This is a very rough estimation and should only be used for native allocation
* registration in VM so it can be accounted for during GC.
*
* @param width The width of the images.
* @param height The height of the images.
* @param format The format of the images.
* @param numImages The number of the images.
*/
public static int getEstimatedNativeAllocBytes(int width, int height, int format,
int numImages) {
double estimatedBytePerPixel;
switch (format) {
// 10x compression from RGB_888
case ImageFormat.JPEG:
case ImageFormat.DEPTH_POINT_CLOUD:
estimatedBytePerPixel = 0.3;
break;
case ImageFormat.Y8:
estimatedBytePerPixel = 1.0;
break;
case ImageFormat.RAW10:
estimatedBytePerPixel = 1.25;
break;
case ImageFormat.YV12:
case ImageFormat.YUV_420_888:
case ImageFormat.NV21:
case ImageFormat.PRIVATE: // A really rough estimate because the real size is unknown.
estimatedBytePerPixel = 1.5;
break;
case ImageFormat.NV16:
case PixelFormat.RGB_565:
case ImageFormat.YUY2:
case ImageFormat.Y16:
case ImageFormat.RAW_SENSOR:
case ImageFormat.DEPTH16:
estimatedBytePerPixel = 2.0;
break;
case PixelFormat.RGB_888:
estimatedBytePerPixel = 3.0;
break;
case PixelFormat.RGBA_8888:
case PixelFormat.RGBX_8888:
estimatedBytePerPixel = 4.0;
break;
default:
throw new UnsupportedOperationException(
String.format("Invalid format specified %d", format));
}
return (int)(width * height * estimatedBytePerPixel * numImages);
}
private static Size getEffectivePlaneSizeForImage(Image image, int planeIdx) {
switch (image.getFormat()) {
case ImageFormat.YV12:
case ImageFormat.YUV_420_888:
case ImageFormat.NV21:
if (planeIdx == 0) {
return new Size(image.getWidth(), image.getHeight());
} else {
return new Size(image.getWidth() / 2, image.getHeight() / 2);
}
case ImageFormat.NV16:
if (planeIdx == 0) {
return new Size(image.getWidth(), image.getHeight());
} else {
return new Size(image.getWidth(), image.getHeight() / 2);
}
case PixelFormat.RGB_565:
case PixelFormat.RGBA_8888:
case PixelFormat.RGBX_8888:
case PixelFormat.RGB_888:
case ImageFormat.JPEG:
case ImageFormat.YUY2:
case ImageFormat.Y8:
case ImageFormat.Y16:
case ImageFormat.RAW_SENSOR:
case ImageFormat.RAW10:
return new Size(image.getWidth(), image.getHeight());
case ImageFormat.PRIVATE:
return new Size(0, 0);
default:
throw new UnsupportedOperationException(
String.format("Invalid image format %d", image.getFormat()));
}
}
private static void directByteBufferCopy(ByteBuffer srcBuffer, int srcOffset,
ByteBuffer dstBuffer, int dstOffset, int srcByteCount) {
Memory.memmove(dstBuffer, dstOffset, srcBuffer, srcOffset, srcByteCount);
}
}