PRINT DATA TRANSFORMATION USING CONVERSION ARRAYS
Methods and systems are disclosed herein for print data transformation using conversion arrays. A print datastream is received, where the print datastream includes bitmap data encoded as a first number of bits per pel. An array of conversion values is retrieved to convert the bitmap data to a second number of bits per pel encoding. The bitmap data is then converted using the array to the second number of bits per pel encoding, where one or more bytes of the bitmap data is used as an index to the array to generate output data. A printed output is generated based on the output data.
1 . A printer comprising:
a print controller operable to receive a print datastream, wherein the print datastream includes bitmap data having a first number of bits per pel, the print controller being further operable to retrieve an array of conversion values used to convert the bitmap data to a second number of bits per pel, and to convert the bitmap data to the second number of bits per pel using the array, wherein one or more bytes of the bitmap data is used as an index to the array to generate output data; and
a print engine operable to generate a printed output based on the output data.
2 . The printer of claim 1 wherein a number of bytes of the index to the array is generally determined according to the following equation:
a mathematical ceiling operator of (the first number of bits per pel/8).
3 . The printer of claim 2 wherein a number of pels in the index to the array is generally determined according to the following equation:
((a number of bytes of the index to the array*8)/the first number of bits per pel).
4 . The printer of claim 3 wherein a number of bytes of the output is generally determined according to the following equation:
(the number of pels in the index to the array*the second number of bits per pel)/8,
wherein the second number of bits per pel is >=8 and the second number of bits per pel≡0 (modulus 8).
5 . The printer of claim 1 wherein a number of pels in the index to the array is generally determined according to the following equation:
a mathematical floor operator of(a number of bits in the array index/the first number of bits per pel), wherein the number of bits in the array index is:
greater than or equal to the first number of bits per pel, and
divisible by 8.
6 . The printer of claim 5 wherein a number of bytes of the output is generally determined according to the following equation:
(the number of pels in the index to the array*the second number of bits per pel)/8,
wherein the second number of bits per pel is >=8 and the second number of bits per pel≡0 (modulus 8).
7 . A method comprising:
receiving a print datastream, wherein the print datastream includes bitmap data having a first number of bits per pel;
retrieving an array of conversion values used to convert the bitmap data to a second number of bits per pel;
converting the bitmap data to the second number of bits per pel using the array, wherein one or more bytes of the bitmap data is used as an index to the array to generate output data; and
generating a printed output based on the output data.
8 . The method of claim 7 wherein a number of bytes of the index to the array is generally determined according to the following equation:
a mathematical ceiling operator of(the first number of bits per pel/8).
9 . The method of claim 8 wherein a number of pels in the index to the array is generally determined according to the following equation:
((a number of bytes of the index to the array*8)/the first number of bits per pel).
10 . The method of claim 9 wherein a number of bytes of the output is generally determined according to the following equation:
(the number of pels in the index to the array*the second number of bits per pel)/8,
wherein the second number of bits per pel is >=8 and the second number of bits per pel≡0 (modulus 8).
11 . The method of claim 7 wherein a number of pels in the index to the array is generally determined according to the following equation:
a mathematical floor operator of(a number of bits in the array index/the first number of bits per pel), wherein the number of bits in the array index is:
greater than or equal to the first number of bits per pel, and
divisible by 8.
12 . The method of claim 11 wherein a number of bytes of the output is generally determined according to the following equation:
(the number of pels in the index to the array*the second number of bits per pel)/8,
wherein the second number of bits per pel is >=8 and the second number of bits per pel≡0 (modulus 8).
13 . A computer readable medium tangibly embodying programmed instructions which, when executed by a computing system are operable to perform a method, the method comprising:
receiving a print datastream, wherein the print datastream includes bitmap data having a first number of bits per pel;
retrieving an array of conversion values used to convert the bitmap data to a second number of bits per pel;
converting the bitmap data to the second number of bits per pel using the array, wherein one or more bytes of the bitmap data is used as an index to the array to generate output data; and
generating a printed output based on the output data.
14 . The computer readable medium of claim 13 wherein a number of bytes of the index to the array is generally determined according to the following equation:
a mathematical ceiling operator of: (the first number of bits per pel/8).
15 . The computer readable medium of claim 14 wherein a number of pels in the index to the array is generally determined according to the following equation:
((a number of bytes of the index to the array*8)/the first number of bits per pel).
16 . The computer readable medium of claim 15 wherein a number of bytes of the output is generally determined according to the following equation:
(the number of pels in the index to the array*the second number of bits per pel)/8,
where the second number of bits per pel is >=8 and the second number of bits per pel≡0 (modulus 8).
17 . The computer readable medium of claim 13 wherein a number of pels in the index to the array is generally determined according to the following equation:
a mathematical floor operator of(a number of bits in the array index/the first number of bits per pel), wherein the number of bits in the array index is:
greater than or equal to the first number of bits per pel, and
divisible by 8.
18 . The computer readable medium of claim 17 wherein a number of bytes of the output is generally determined according to the following equation:
(the number of pels in the index to the array*the second number of bits per pel)/8,
wherein the second number of bits per pel is >=8 and the second number of bits per pel≡0 (modulus 8).