Merge "camera2: Fix local variable names in rgb->ycbcr conversion."

 * Convert from RGB 888 to Y'CbCr using the conversion specified in JFIF v1.02

 */

static void rgbToYuv420(uint8_t* rgbBuf, size_t width, size_t height, uint8_t* yPlane,

        uint8_t* uPlane, uint8_t* vPlane, size_t chromaStep, size_t yStride, size_t chromaStride) {

        uint8_t* crPlane, uint8_t* cbPlane, size_t chromaStep, size_t yStride, size_t chromaStride) {

    uint8_t R, G, B;

    size_t index = 0;

    for (size_t j = 0; j < height; j++) {

        uint8_t* u = uPlane;

        uint8_t* v = vPlane;

        uint8_t* cr = crPlane;

        uint8_t* cb = cbPlane;

        uint8_t* y = yPlane;

        bool jEven = (j & 1) == 0;

        for (size_t i = 0; i < width; i++) {

            B = rgbBuf[index++];

            *y++ = (77 * R + 150 * G +  29 * B) >> 8;

            if (jEven && (i & 1) == 0) {

                *v = (( -43 * R - 85 * G + 128 * B) >> 8) + 128;

                *u = (( 128 * R - 107 * G - 21 * B) >> 8) + 128;

                u += chromaStep;

                v += chromaStep;

                *cb = (( -43 * R - 85 * G + 128 * B) >> 8) + 128;

                *cr = (( 128 * R - 107 * G - 21 * B) >> 8) + 128;

                cr += chromaStep;

                cb += chromaStep;

            }

            // Skip alpha

            index++;

        }

        yPlane += yStride;

        if (jEven) {

            uPlane += chromaStride;

            vPlane += chromaStride;

            crPlane += chromaStride;

            cbPlane += chromaStride;

        }

    }

}