fbtest.c

IBM source for pallas/vulcan/vesta

    0x3E, 0xCE, 0xBF, 0x95, 0x95, 0x95, 0x2C, 0x95,
    0x95, 0x55, 0xCB, 0xCB, 0xCB, 0xCB, 0xCB, 0x55,
    0xA1, 0x55, 0x95, 0xA1, 0xD6, 0xA1, 0x55, 0x94,
    0x94, 0xE8, 0x60, 0xC4, 0x3E, 0x2D, 0x2D, 0x2D,
    0x33, 0x5D, 0x82, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x89, 0xAA, 0x59, 0x20, 0x20, 0x28, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xEC, 0x4A, 0x2D, 0x50, 0x78, 0x2E,
    0x57, 0x51, 0xF0, 0x57, 0x31, 0x4D, 0x50, 0x2D,
    0x5D, 0xF2, 0xA1, 0x2C, 0x95, 0x95, 0x55, 0x55,
    0x90, 0x90, 0x70, 0x90, 0xCB, 0x55, 0x55, 0x55,
    0x6D, 0x2C, 0xA1, 0xD6, 0xD6, 0xA1, 0x55, 0x94,
    0x70, 0xB9, 0x75, 0x50, 0x3E, 0x49, 0x49, 0x49,
    0x5D, 0x82, 0x49, 0x49, 0x82, 0x49, 0x49, 0x49,
    0x89, 0x69, 0x4F, 0x20, 0x20, 0x20, 0x8A, 0x42,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0x83, 0x4A, 0x3A, 0x50, 0x62, 0x23,
    0x81, 0xB8, 0xB8, 0xE9, 0x5F, 0x29, 0x33, 0x5D,
    0x5D, 0x73, 0xE8, 0xCB, 0x55, 0x55, 0x55, 0x55,
    0x55, 0x55, 0x95, 0x95, 0x2C, 0x2C, 0x2C, 0x2C,
    0xD6, 0xA1, 0xA1, 0xA1, 0xA1, 0x55, 0x70, 0x70,
    0xCB, 0x68, 0x75, 0x50, 0x82, 0x49, 0x49, 0x49,
    0x5D, 0x49, 0x49, 0x5D, 0x49, 0x49, 0x5D, 0x82,
    0x69, 0x5D, 0x25, 0xF0, 0x20, 0x20, 0x20, 0xE1,
    0x2A, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0x4B, 0xF4, 0xDF, 0x50, 0x73, 0x76, 0x48,
    0x75, 0xDF, 0x75, 0x62, 0xC4, 0x33, 0x82, 0x49,
    0x5D, 0x5D, 0xA8, 0xF5, 0x55, 0x55, 0x55, 0x55,
    0x2C, 0x2C, 0xA1, 0xA1, 0xA1, 0xA1, 0xA1, 0xA1,
    0x2C, 0x2C, 0x2C, 0x95, 0x95, 0xCB, 0x70, 0x70,
    0x95, 0x83, 0x5F, 0xEA, 0x2D, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x5D, 0x49, 0x22, 0x5A, 0x79, 0x20, 0x20, 0x20,
    0x80, 0xD2, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0x65, 0xD0, 0x63, 0x5F, 0x29, 0x2D, 0x2D, 0xEA,
    0x29, 0x29, 0x76, 0x50, 0x2D, 0x82, 0x49, 0x49,
    0x3E, 0x49, 0x5C, 0xB0, 0xBA, 0x95, 0x55, 0x55,
    0x2C, 0xA1, 0xD6, 0xD6, 0xD6, 0xA1, 0x2C, 0x2C,
    0xA1, 0x95, 0x95, 0x55, 0xCB, 0x70, 0x70, 0x55,
    0x2C, 0x83, 0x60, 0x76, 0x5D, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x5D, 0x89, 0xDC, 0x8B, 0x20, 0x20, 0x20,
    0x20, 0x95, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE2, 0x32, 0x85, 0xE3, 0x29, 0x2D, 0x33, 0x2D,
    0x2D, 0x2D, 0x6A, 0x2D, 0x33, 0x5D, 0x49, 0x82,
    0x49, 0x49, 0x82, 0x73, 0x5C, 0x9E, 0x2C, 0x55,
    0x2C, 0xA1, 0xD6, 0xA1, 0x2C, 0x2C, 0x95, 0x95,
    0x2C, 0x95, 0x55, 0xCB, 0x90, 0x90, 0xCB, 0x95,
    0x2C, 0x6D, 0x41, 0x6F, 0x3E, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x82, 0x3E, 0x4E, 0x38, 0xCA, 0x20, 0x20,
    0x20, 0x55, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0x65,
    0x42, 0xA0, 0xD4, 0xE3, 0x29, 0x2D, 0x82, 0x5D,
    0x5D, 0x82, 0x82, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x3E, 0x49, 0x49, 0x49, 0x5C, 0x56, 0xD6,
    0xA1, 0xA1, 0xA1, 0x95, 0x55, 0x55, 0x55, 0x95,
    0xA1, 0x55, 0x90, 0x70, 0x94, 0x70, 0x95, 0x2C,
    0x2C, 0xD6, 0xDD, 0x6F, 0x33, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x5D, 0x5D, 0x82, 0x69, 0x22, 0x62, 0x80, 0x34,
    0x94, 0x6B, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0x65, 0xE5, 0x65, 0x6B,
    0xD5, 0x88, 0x5B, 0xE3, 0x29, 0x5D, 0x5D, 0x5D,
    0x5D, 0x5D, 0x5D, 0x5D, 0x49, 0x49, 0x49, 0x82,
    0x49, 0x49, 0x89, 0x49, 0x82, 0x49, 0x71, 0xBA,
    0x6D, 0x6D, 0xA1, 0x95, 0x55, 0xCB, 0x55, 0x55,
    0x2C, 0x55, 0x70, 0x70, 0x70, 0x90, 0x95, 0xA1,
    0x2C, 0xA1, 0x41, 0x76, 0x5D, 0x5D, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x5D, 0x82, 0x5D, 0x89, 0x5E, 0x96, 0x65,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0xE5, 0xE5, 0xE5, 0xE5, 0x65, 0x65, 0xEC, 0xB1,
    0x20, 0x20, 0xCA, 0x23, 0x29, 0x33, 0x49, 0x5D,
    0x49, 0x82, 0x49, 0x49, 0x49, 0x49, 0x49, 0x82,
    0x49, 0x82, 0x5D, 0x5D, 0x5D, 0x2D, 0x5C, 0x8F,
    0x6D, 0xD6, 0x2C, 0x55, 0x90, 0xCB, 0x95, 0x95,
    0x95, 0x55, 0x70, 0x94, 0x70, 0x55, 0x2C, 0xA1,
    0x95, 0xE8, 0x5F, 0x76, 0x33, 0x5D, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x3E, 0x9C, 0x2F, 0x68,
    0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5, 0xE5,
    0x65, 0xE5, 0x65, 0xE5, 0x6B, 0x90, 0x80, 0x20,
    0x20, 0x20, 0x4F, 0x81, 0x50, 0x3E, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x69, 0x69, 0x49, 0x5D, 0x2D, 0xC4, 0x46, 0xA3,
    0xD6, 0x55, 0x70, 0x94, 0x94, 0x70, 0xCB, 0x55,
    0x55, 0xCB, 0x70, 0x47, 0x70, 0x95, 0xA1, 0xA1,
    0x95, 0xBD, 0x75, 0x2D, 0x33, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x5D, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x5D, 0x2D, 0xB5, 0xDB,
    0xD6, 0x65, 0xE5, 0x65, 0xE5, 0xE5, 0x65, 0xE5,
    0x65, 0x65, 0x6B, 0x95, 0x2B, 0x88, 0x20, 0x20,
    0x20, 0x20, 0x8B, 0x81, 0x29, 0x33, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x3E, 0x3E, 0x5E, 0x41, 0x97, 0x27, 0xD6,
    0x55, 0x94, 0xE6, 0xE6, 0x47, 0x70, 0x55, 0x55,
    0x94, 0x70, 0x94, 0x94, 0x70, 0x55, 0xA1, 0x2C,
    0x6D, 0xC5, 0x39, 0x6A, 0x5D, 0x5D, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x3E, 0xEA, 0x30, 0x77,
    0xE1, 0xC9, 0x94, 0x2C, 0xD6, 0xD6, 0xA1, 0x55,
    0x47, 0x9F, 0x43, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x80, 0x91, 0x81, 0x6A, 0x2D, 0x49, 0x49,
    0x49, 0x5D, 0x5D, 0x49, 0x49, 0x5D, 0x5D, 0x82,
    0xEB, 0x4A, 0x41, 0xC2, 0x8F, 0xF5, 0xA1, 0x55,
    0x94, 0x28, 0xA0, 0x47, 0x70, 0x55, 0x95, 0x95,
    0x47, 0x70, 0x70, 0x94, 0x90, 0x95, 0xA1, 0x2C,
    0xE8, 0xA6, 0x39, 0x76, 0x50, 0x50, 0x2D, 0x2D,
    0x3E, 0x3E, 0x5D, 0x3E, 0x5D, 0x5D, 0x49, 0x82,
    0x49, 0x49, 0x49, 0x82, 0x82, 0x50, 0x75, 0xE0,
    0x57, 0x20, 0x88, 0x88, 0x20, 0x20, 0x88, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x79, 0x91, 0x81, 0x76, 0x33, 0x49, 0x49,
    0x5D, 0x82, 0x49, 0x49, 0x3E, 0x6A, 0xEA, 0x29,
    0xDF, 0x97, 0xBF, 0x6D, 0x6D, 0xD6, 0x55, 0x47,
    0x28, 0x28, 0x47, 0x70, 0x55, 0x95, 0x2C, 0x2C,
    0x95, 0x95, 0x55, 0x90, 0x90, 0x95, 0xA1, 0xA1,
    0xD6, 0x26, 0x45, 0x81, 0x5F, 0x30, 0x48, 0x6F,
    0x6F, 0x29, 0x29, 0x6A, 0x2D, 0x2D, 0x5D, 0x49,
    0x49, 0x49, 0x49, 0x49, 0x2D, 0x76, 0x6E, 0x77,
    0x5B, 0x66, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x20, 0x79, 0xA9, 0xB8, 0x39, 0x50, 0x5D, 0x5D,
    0x5D, 0x5D, 0x3E, 0x2D, 0x29, 0x76, 0xCD, 0x37,
    0xB9, 0xA1, 0xA1, 0x6D, 0x6D, 0x2C, 0x94, 0x28,
    0xD5, 0xE6, 0x70, 0x55, 0x95, 0xA1, 0x2C, 0xA1,
    0xBF, 0xA1, 0x95, 0xCB, 0x55, 0x95, 0xA1, 0x2C,
    0x95, 0x83, 0xDE, 0x87, 0xB6, 0xBE, 0x40, 0x6E,
    0x81, 0x81, 0x78, 0x78, 0x39, 0x6F, 0xEA, 0x2D,
    0x2D, 0x33, 0x33, 0x33, 0x76, 0x30, 0x64, 0x54,
    0x5B, 0x66, 0x20, 0x20, 0x66, 0x20, 0x88, 0x20,
    0x20, 0x20, 0x88, 0x20, 0x20, 0x20, 0x20, 0x20,
    0x88, 0x34, 0x8B, 0xF1, 0x23, 0x6F, 0x50, 0x2D,
    0x2D, 0x6A, 0x29, 0x6F, 0x78, 0x84, 0x9B, 0xD2,
    0x2C, 0x2C, 0xD6, 0x6D, 0x6D, 0x2C, 0x47, 0xA0,
    0xE6, 0x70, 0x55, 0x95, 0x2C, 0xA1, 0xA1, 0xA1,
    0xD2, 0x95, 0x55, 0xCB, 0x55, 0x2C, 0xD6, 0xA1,
    0x95, 0x95, 0xA1, 0xD6, 0x6D, 0x6D, 0xBA, 0xF3,
    0x8D, 0x36, 0x74, 0x36, 0xF1, 0xB8, 0x23, 0x78,
    0x62, 0x4A, 0x29, 0x62, 0x23, 0xF1, 0x54, 0x31,
    0x57, 0x2B, 0x90, 0x95, 0x2C, 0x2C, 0x2C, 0x2C,
    0xA1, 0xA1, 0xA1, 0xA1, 0x2C, 0x2C, 0x2C, 0xCB,
    0xE6, 0x7D, 0xCA, 0xB7, 0xB8, 0x75, 0x6F, 0x6F,
    0x76, 0x6F, 0x78, 0x81, 0x53, 0xBD, 0x6D, 0x2C,
    0x95, 0x95, 0xA1, 0x6D, 0xA1, 0x55, 0x94, 0xE6,
    0x70, 0xCB, 0x55, 0x95, 0xA1, 0xD6, 0xD6, 0xA1,
    0xD0, 0x94, 0x94, 0x90, 0x95, 0x2C, 0xD6, 0xA1,
    0x95, 0x55, 0x2C, 0xA1, 0xD6, 0xA1, 0x95, 0x2C,
    0xD6, 0x68, 0xAB, 0x6C, 0xA4, 0x77, 0x77, 0xAD,
    0x40, 0x53, 0x6E, 0x40, 0xB7, 0x54, 0x31, 0xD7,
    0xAC, 0xD6, 0x55, 0x55, 0x95, 0x95, 0x95, 0x55,
    0x95, 0x2C, 0x2C, 0xA1, 0x95, 0x95, 0x2C, 0xA1,
    0x6D, 0xD2, 0x7C, 0x54, 0xAD, 0x40, 0x6E, 0x81,
    0x81, 0x6E, 0x36, 0xDA, 0xE8, 0xD6, 0xD6, 0x2C,
    0x2C, 0x2C, 0xA1, 0xD6, 0x95, 0x90, 0x94, 0x47,
    0x94, 0x94, 0x70, 0x55, 0x2C, 0xD6, 0xA1, 0x95,
    0x95, 0x28, 0x47, 0x90, 0x95, 0x2C, 0xA1, 0x2C,
    0x55, 0x95, 0x2C, 0xA1, 0xA1, 0x2C, 0x2C, 0x2C,
    0x2C, 0xA1, 0x55, 0x70, 0x95, 0x2C, 0xB2, 0xB4,
    0xC3, 0xC3, 0x54, 0x54, 0xA9, 0x31, 0xCA, 0x2A,
    0x95, 0x90, 0x55, 0x95, 0x2C, 0xA1, 0x2C, 0x95,
    0x95, 0x2C, 0x2C, 0x2C, 0x2C, 0x2C, 0x2C, 0xD6,
    0x6D, 0x2A, 0xB2, 0x4F, 0x31, 0x2E, 0xE0, 0xAD,
    0xB7, 0xC8, 0xB4, 0xF5, 0x2C, 0xA1, 0xA1, 0xA1,
    0x95, 0x2C, 0xA1, 0x2C, 0x95, 0x70, 0x94, 0x94,
    0x94, 0x94, 0x70, 0x95, 0xD6, 0xD6, 0x2C, 0x95,
    0x94, 0x28, 0x47, 0xCB, 0x95, 0x2C, 0xA1, 0xA1,
    0x95, 0x55, 0x2C, 0xA1, 0xD6, 0xA1, 0x95, 0x95,
    0x95, 0x2C, 0x55, 0x70, 0x70, 0x70, 0x94, 0x2C,
    0x63, 0xBB, 0xA5, 0xD7, 0xCA, 0xB3, 0x6D, 0x2C,
    0x55, 0x55, 0x95, 0x2C, 0x2C, 0x2C, 0x95, 0x95,
    0x95, 0x2C, 0x2C, 0x2C, 0x2C, 0x2C, 0x2C, 0xA1,
    0xD6, 0x2C, 0x70, 0x95, 0xAC, 0xC0, 0xDB, 0xEF,
    0xEF, 0xA2, 0xE8, 0x95, 0x95, 0xA1, 0xD6, 0xA1,
    0x95, 0x55, 0x2C, 0x95, 0x55, 0x70, 0x70, 0x70,
    0x94, 0x70, 0x55, 0xD6, 0x6D, 0x6D, 0x95, 0x55,
    0x70, 0x47, 0x70, 0x95, 0x2C, 0x2C, 0x2C, 0xA1,
    0x2C, 0x95, 0x2C, 0xA1, 0xD6, 0xA1, 0x95, 0x55,
    0x55, 0x95, 0x55, 0x55, 0x55, 0x55, 0x55, 0x95,
    0xA1, 0xF5, 0xBF, 0xBF, 0xA1, 0x95, 0x95, 0x95,
    0x95, 0x55, 0x2C, 0x2C, 0x95, 0x55, 0x55, 0x95,
    0x95, 0x95, 0xA1, 0xA1, 0xA1, 0xA1, 0x2C, 0xA1,
    0x2C, 0x55, 0x70, 0x94, 0x90, 0x2C, 0x6D, 0x6D,
    0x6D, 0xA1, 0x2C, 0x95, 0x2C, 0xA1, 0xD6, 0xA1,
    0x2C, 0x55, 0x55, 0x95, 0x55, 0x55, 0x55, 0x55,
    0x55, 0x95, 0xD6, 0x6D, 0xBF, 0xD6, 0x55, 0xCB,
    0x55, 0x55, 0x55, 0x2C, 0x2C, 0x2C, 0x2C, 0xA1,
    0xA1, 0x95, 0x2C, 0xA1, 0xA1, 0xA1, 0x2C, 0x95,
    0x55, 0x95, 0x95, 0x2C, 0x2C, 0x2C, 0x2C, 0xA1,
    0x6D, 0xBF, 0x6D, 0x2C, 0x55, 0x55, 0x95, 0x95,
    0xCB, 0xCB, 0x55, 0x55, 0xCB, 0x55, 0x55, 0x95,
    0x95, 0x2C, 0x2C, 0xA1, 0xA1, 0xA1, 0x2C, 0x2C,
    0xA1, 0x95, 0xCB, 0xCB, 0x95, 0x95, 0x2C, 0x2C,
    0x2C, 0xA1, 0x2C, 0x2C, 0x2C, 0xA1, 0xA1, 0x2C,
    0x2C, 0x95, 0x55, 0x95, 0x95, 0x2C, 0x2C, 0x2C,
    0x2C, 0xA1, 0x6D, 0xBF, 0x6D, 0xA1, 0x55, 0x55,
    0x95, 0x95, 0x95, 0x95, 0x2C, 0x2C, 0x2C, 0x2C,
    0x2C, 0x95, 0x95, 0x95, 0x2C, 0x2C, 0x2C, 0x95,
    0x55, 0x95, 0x2C, 0x2C, 0xA1, 0xA1, 0xD6, 0xD6,
    0x6D, 0x6D, 0xA1, 0x95, 0xCB, 0x55, 0x95, 0x55,
    0x90, 0x70, 0xCB, 0xCB, 0x90, 0xCB, 0x95, 0x95,
    0x2C, 0x2C, 0xA1, 0xD6, 0xA1, 0xA1, 0xA1, 0xA1,
    0xA1, 0xA1, 0x2C, 0x95, 0x95, 0x2C, 0x2C, 0x2C,
    0x2C, 0xA1, 0x2C, 0x95, 0x95, 0x95, 0x2C, 0x2C,
    0x2C, 0x95, 0x55, 0x55, 0x2C, 0x2C, 0xA1, 0xA1,
    0xD6, 0xD6, 0x6D, 0x6D, 0xA1, 0x55, 0xCB, 0x55
};

/*
 * tux-demo.c
 *
 * This demo assumes 8bpp and 640x480 display. It moves Tux around on the
 * display. It is a simple example that shows some of the more common ioctl
 * calls to the frame buffer.
 *
 *  Copyright (C) 2000 Scott A. McConnell
 * 
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 */

/* Needed work:
 *    -Remove 640x480 display assumption.
 *    -Remove 8 BPP assumption.
 */

#include <sys/mman.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <errno.h>

#define DEFAULT_FRAMEBUFFER "/dev/fb0"
#define NULL 0

#define FILL 0x20;              /* Fill color */

int fbfd = 0;

struct fb_var_screeninfo vinfo;

struct fb_fix_screeninfo finfo;
long int screensize = 0;
char *fbp = 0;

#define SIZE finfo.smem_len

/* RGB <--> YUV Conversion Formulas
 
--------------------------------------------------------------------------------
 
       R = Y + (1.4075 * (V - 128));
       G = Y - (0.3455 * (U - 128) - (0.7169 * (V - 128));
       B = Y + (1.7790 * (U - 128);
       Y = R *  .299 + G *  .587 + B *  .114;
       U = R * -.169 + G * -.332 + B *  .500 + 128.;
       V = R *  .500 + G * -.419 + B * -.0813 + 128.;
*/

static void rgb_to_ycbcr(unsigned long r,
                         unsigned long g, unsigned long b, int *r_y,
                         int *r_cb, int *r_cr)
{

    long y;
    long cb;
    long cr;
    long r1;

    /*-------------------------------------------------------------------------+
    | Convert using formula on page 42 of Video Demystified.
    +-------------------------------------------------------------------------*/
    r1 = (r * 66) + (g * 129) + (b * 25);

    if ((r1 % 256) > 128)
    {
        y = 1;
    }
    else
    {
        y = 0;
    }

    y += ((r1 >> 8) + 16);
    r1 = ((-((long) r * 38)) - ((long) g * 74) + ((long) b * 112));

    if ((r1 % 256) > 128)
    {
        cb = 1;
    }
    else if ((r1 % 256) < (-128))
    {
        cb = -1;
    }
    else
    {
        cb = 0;
    }

    cb += ((r1 >> 8) + 128);
    r1 = (((long) r * 112) - ((long) g * 94) - ((long) b * 18));

    if ((r1 % 256) > 128)
    {
        cr = 1;
    }
    else if ((r1 % 256) < (-128))
    {
        cr = -1;
    }
    else
    {
        cr = 0;
    }

    cr += (r1 >> 8) + 128;
#if 0
    /*-------------------------------------------------------------------------+
    | Bound check.
    +-------------------------------------------------------------------------*/

    if (y < 0)
    {
        y = 0;
    }

    if (y > 255)
    {
        y = 255;
    }

    if (cb < 0)
    {
        cb = 0;
    }

    if (cb > 255)
    {
        cb = 255;
    }

    if (cr < 0)
    {
        cr = 0;