110 lines
3.5 KiB
Java
110 lines
3.5 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.graphics;
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public class ImageFormat {
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/*
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* these constants are chosen to be binary compatible with their previous
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* location in PixelFormat.java
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*/
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public static final int UNKNOWN = 0;
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/**
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* RGB format used for pictures encoded as RGB_565 see
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* {@link android.hardware.Camera.Parameters#setPictureFormat(int)}.
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*/
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public static final int RGB_565 = 4;
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/**
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* Android YUV format:
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*
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* This format is exposed to software decoders and applications.
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*
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* YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed
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* by (W/2) x (H/2) Cr and Cb planes.
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*
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* This format assumes
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* - an even width
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* - an even height
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* - a horizontal stride multiple of 16 pixels
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* - a vertical stride equal to the height
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*
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* y_size = stride * height
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* c_size = ALIGN(stride/2, 16) * height/2
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* size = y_size + c_size * 2
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* cr_offset = y_size
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* cb_offset = y_size + c_size
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*
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* Whether this format is supported by the camera hardware can be determined
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* by
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* {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}.
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*/
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public static final int YV12 = 0x32315659;
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/**
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* YCbCr format, used for video. Whether this format is supported by the
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* camera hardware can be determined by
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* {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}.
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*/
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public static final int NV16 = 0x10;
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/**
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* YCrCb format used for images, which uses the NV21 encoding format. This
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* is the default format for camera preview images, when not otherwise set
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* with {@link android.hardware.Camera.Parameters#setPreviewFormat(int)}.
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*/
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public static final int NV21 = 0x11;
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/**
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* YCbCr format used for images, which uses YUYV (YUY2) encoding format.
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* This is an alternative format for camera preview images. Whether this
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* format is supported by the camera hardware can be determined by
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* {@link android.hardware.Camera.Parameters#getSupportedPreviewFormats()}.
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*/
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public static final int YUY2 = 0x14;
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/**
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* Encoded formats. These are not necessarily supported by the hardware.
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*/
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public static final int JPEG = 0x100;
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/**
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* Use this function to retrieve the number of bits per pixel of an
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* ImageFormat.
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*
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* @param format
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* @return the number of bits per pixel of the given format or -1 if the
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* format doesn't exist or is not supported.
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*/
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public static int getBitsPerPixel(int format) {
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switch (format) {
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case RGB_565:
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return 16;
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case NV16:
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return 16;
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case YUY2:
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return 16;
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case YV12:
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return 12;
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case NV21:
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return 12;
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}
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return -1;
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}
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}
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