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127
smartcameralib/src/main/java/me/pqpo/smartcameralib/utils/BitmapUtil.java
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| @@ -0,0 +1,127 @@ | ||
| package me.pqpo.smartcameralib.utils; | ||
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| import android.util.Log; | ||
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| /** | ||
| * Created by pqpo on 2018/9/29. | ||
| */ | ||
| public class BitmapUtil { | ||
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| private static final String TAG = "BitmapUtil"; | ||
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| // Returns the degrees in clockwise. Values are 0, 90, 180, or 270. | ||
| public static int getOrientation(byte[] jpeg) { | ||
| if (jpeg == null) { | ||
| return 0; | ||
| } | ||
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| int offset = 0; | ||
| int length = 0; | ||
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| // ISO/IEC 10918-1:1993(E) | ||
| while (offset + 3 < jpeg.length && (jpeg[offset++] & 0xFF) == 0xFF) { | ||
| int marker = jpeg[offset] & 0xFF; | ||
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| // Check if the marker is a padding. | ||
| if (marker == 0xFF) { | ||
| continue; | ||
| } | ||
| offset++; | ||
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| // Check if the marker is SOI or TEM. | ||
| if (marker == 0xD8 || marker == 0x01) { | ||
| continue; | ||
| } | ||
| // Check if the marker is EOI or SOS. | ||
| if (marker == 0xD9 || marker == 0xDA) { | ||
| break; | ||
| } | ||
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| // Get the length and check if it is reasonable. | ||
| length = pack(jpeg, offset, 2, false); | ||
| if (length < 2 || offset + length > jpeg.length) { | ||
| Log.e(TAG, "Invalid length"); | ||
| return 0; | ||
| } | ||
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| // Break if the marker is EXIF in APP1. | ||
| if (marker == 0xE1 && length >= 8 && | ||
| pack(jpeg, offset + 2, 4, false) == 0x45786966 && | ||
| pack(jpeg, offset + 6, 2, false) == 0) { | ||
| offset += 8; | ||
| length -= 8; | ||
| break; | ||
| } | ||
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| // Skip other markers. | ||
| offset += length; | ||
| length = 0; | ||
| } | ||
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| // JEITA CP-3451 Exif Version 2.2 | ||
| if (length > 8) { | ||
| // Identify the byte order. | ||
| int tag = pack(jpeg, offset, 4, false); | ||
| if (tag != 0x49492A00 && tag != 0x4D4D002A) { | ||
| Log.e(TAG, "Invalid byte order"); | ||
| return 0; | ||
| } | ||
| boolean littleEndian = (tag == 0x49492A00); | ||
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| // Get the offset and check if it is reasonable. | ||
| int count = pack(jpeg, offset + 4, 4, littleEndian) + 2; | ||
| if (count < 10 || count > length) { | ||
| Log.e(TAG, "Invalid offset"); | ||
| return 0; | ||
| } | ||
| offset += count; | ||
| length -= count; | ||
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| // Get the count and go through all the elements. | ||
| count = pack(jpeg, offset - 2, 2, littleEndian); | ||
| while (count-- > 0 && length >= 12) { | ||
| // Get the tag and check if it is orientation. | ||
| tag = pack(jpeg, offset, 2, littleEndian); | ||
| if (tag == 0x0112) { | ||
| // We do not really care about type and count, do we? | ||
| int orientation = pack(jpeg, offset + 8, 2, littleEndian); | ||
| switch (orientation) { | ||
| case 1: | ||
| return 0; | ||
| case 3: | ||
| return 180; | ||
| case 6: | ||
| return 90; | ||
| case 8: | ||
| return 270; | ||
| } | ||
| Log.i(TAG, "Unsupported orientation"); | ||
| return 0; | ||
| } | ||
| offset += 12; | ||
| length -= 12; | ||
| } | ||
| } | ||
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| Log.i(TAG, "Orientation not found"); | ||
| return 0; | ||
| } | ||
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| private static int pack(byte[] bytes, int offset, int length, | ||
| boolean littleEndian) { | ||
| int step = 1; | ||
| if (littleEndian) { | ||
| offset += length - 1; | ||
| step = -1; | ||
| } | ||
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| int value = 0; | ||
| while (length-- > 0) { | ||
| value = (value << 8) | (bytes[offset] & 0xFF); | ||
| offset += step; | ||
| } | ||
| return value; | ||
| } | ||
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| } |