图片转byte

编程技术  /  houtizong 发布于 3年前   130

public byte[] StartBmpToPrintCode(Bitmap bitmap) {byte temp = 0;int j = 7;int start = 0;if (bitmap != null) {int mWidth = bitmap.getWidth();int mHeight = bitmap.getHeight();int[] mIntArray = new int[mWidth * mHeight];byte[] data = new byte[mWidth * mHeight];bitmap.getPixels(mIntArray, 0, mWidth, 0, 0, mWidth, mHeight);encodeYUV420SP(data, mIntArray, mWidth, mHeight);byte[] result = new byte[mWidth * mHeight / 8];for (int i = 0; i < mWidth * mHeight; i++) {temp = (byte) ((byte) (data[i] << j) + temp);j--;if (j < 0) {j = 7;}if (i % 8 == 7) {result[(start++)] = temp;temp = 0;}}if (j != 7) {result[(start++)] = temp;}int aHeight = 24 - mHeight % 24;int perline = mWidth / 8;byte[] add = new byte[aHeight * perline];byte[] nresult = new byte[mWidth * mHeight / 8 + aHeight * perline];System.arraycopy(result, 0, nresult, 0, result.length);System.arraycopy(add, 0, nresult, result.length, add.length);byte[] byteContent = new byte[(mWidth / 8 + 4) * (mHeight + aHeight)];byte[] bytehead = new byte[4];bytehead[0] = 31;bytehead[1] = 16;bytehead[2] = (byte) (mWidth / 8);bytehead[3] = 0;for (int index = 0; index < mHeight + aHeight; index++) {System.arraycopy(bytehead, 0, byteContent, index * (perline + 4), 4);System.arraycopy(nresult, index * perline, byteContent, index * (perline + 4) + 4, perline);}return byteContent;}return null;}// 图片转换成bytepublic void encodeYUV420SP(byte[] yuv420sp, int[] rgba, int width, int height) {int frameSize = width * height;int[] U = new int[frameSize];int[] V = new int[frameSize];int uvwidth = width / 2;int bits = 8;int index = 0;int f = 0;for (int j = 0; j < height; j++) {for (int i = 0; i < width; i++) {int r = (rgba[index] & 0xFF000000) >> 24;int g = (rgba[index] & 0xFF0000) >> 16;int b = (rgba[index] & 0xFF00) >> 8;int y = (66 * r + 129 * g + 25 * b + 128 >> 8) + 16;int u = (-38 * r - 74 * g + 112 * b + 128 >> 8) + 128;int v = (112 * r - 94 * g - 18 * b + 128 >> 8) + 128;byte temp = (byte) (y > 255 ? 255 : y < 0 ? 0 : y);yuv420sp[(index++)] = (byte) (temp > 0 ? 1 : 0);}}f = 0;}