290 lines
8.3 KiB
ArmAsm
290 lines
8.3 KiB
ArmAsm
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Jens Arnold
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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.section .icode, "ax", @progbits
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/* lcd_write_yuv420_lines(), based on lcd-as-x5.S
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*
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* See http://en.wikipedia.org/wiki/YCbCr
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* ITU-R BT.601 (formerly CCIR 601):
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* |Y'| | 0.299000 0.587000 0.114000| |R|
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* |Pb| = |-0.168736 -0.331264 0.500000| |G| or 0.564334*(B - Y')
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* |Pr| | 0.500000 -0.418688 0.081312| |B| or 0.713267*(R - Y')
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* Scaled, normalized and rounded:
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* |Y'| | 65 129 25| |R| + 16 : 16->235
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* |Cb| = |-38 -74 112| |G| + 128 : 16->240
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* |Cr| |112 -94 -18| |B| + 128 : 16->240
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*
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* The inverse:
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* |R| |1.000000 0.000000 1.402000| |Y'|
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* |G| = |1.000000 -0.334136 -0.714136| |Pb|
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* |B| |1.000000 1.772000 0.000000| |Pr|
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* Scaled, normalized, rounded and tweaked to yield RGB666, as converting
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* directly to RGB565 gives too much roundoff error:
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* |R| |74 0 101| |Y' - 16| / 256
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* |G| = |74 -24 -51| |Cb - 128| / 256
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* |B| |74 128 0| |Cr - 128| / 256
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*/
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.align 2
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.global lcd_write_yuv420_lines
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.type lcd_write_yuv420_lines, @function
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lcd_write_yuv420_lines:
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lea.l (-36, %sp), %sp /* free up some registers */
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movem.l %d2-%d6/%a2-%a5, (%sp)
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lea.l 0xf0000002, %a0 /* LCD data port */
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movem.l (36+4, %sp), %a1-%a5 /* Y data, Cb data, guv storage, Cr data, width */
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lea.l (%a1, %a5), %a5 /* end address */
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.yuv_line_loop1:
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/* chroma for first & second pixel */
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clr.l %d1 /* load bu component */
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move.b (%a2), %d1
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clr.l %d3 /* load rv component */
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move.b (%a4), %d3
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moveq.l #-128, %d0
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add.l %d0, %d1
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add.l %d0, %d3
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move.l %d1, %d2 /* %d2 = cb component for guv */
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asr.l #1, %d1 /* %d1 = 128 * (Cb - 128) / 256 */
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move.b %d1, (%a2)+ /* save bu for next line */
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moveq.l #-24, %d0
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muls.w %d0, %d2 /* %d2 = -24 * (Cb - 128)*/
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moveq.l #-51, %d0
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muls.w %d3, %d0
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add.l %d0, %d2 /* %d2 = -24 * (Cb - 128) - 51 * (Cr - 128) */
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asr.l #8, %d2
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move.b %d2, (%a3)+ /* save guv for next line */
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moveq.l #101, %d0
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muls.w %d0, %d3 /* %d3 = 101 * (Cr - 128) */
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asr.l #8, %d3
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move.b %d3, (%a4)+ /* save rv for next line */
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/* luma for first pixel */
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clr.l %d4 /* load y component */
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move.b (%a1)+, %d4
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moveq.l #74, %d0
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muls.w %d0, %d4 /* %d4 = 36 * Y */
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asr.l #8, %d4
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subq.l #4, %d4 /* correction for (Y - 16) and rounding */
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move.l %d4, %d5
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move.l %d4, %d6
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/* combine & write first pixel */
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add.l %d1, %d4 /* %d4 = blue */
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add.l %d2, %d5 /* %d5 = green */
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add.l %d3, %d6 /* %d6 = red */
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move.l %d4, %d0 /* clamping */
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or.l %d5, %d0
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or.l %d6, %d0
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asr.l #6, %d0
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beq.s .yuv_all_ok1
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moveq.l #63, %d0
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cmp.l %d0, %d4
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bls.s .yuv_blue_ok1
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spl.b %d4
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and.l %d0, %d4
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.yuv_blue_ok1:
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cmp.l %d0, %d5
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bls.s .yuv_green_ok1
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spl.b %d5
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and.l %d0, %d5
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.yuv_green_ok1:
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cmp.l %d0, %d6
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bls.s .yuv_red_ok1
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spl.b %d6
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and.l %d0, %d6
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.yuv_red_ok1:
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.yuv_all_ok1:
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lsr.l #1, %d6 /* pack, convert to RGB565 and output */
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lsr.l #1, %d4
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lsl.l #6, %d6
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or.l %d6, %d5
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lsl.l #5, %d5
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or.l %d5, %d4
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move.w %d4, (%a0)
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/* luma for second pixel */
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clr.l %d4 /* load y component */
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move.b (%a1)+, %d4
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moveq.l #74, %d0
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muls.w %d0, %d4 /* %d4 = 36 * Y */
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asr.l #8, %d4
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subq.l #4, %d4 /* correction for (Y - 16) and rounding */
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/* combine & write second pixel */
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add.l %d4, %d1 /* %d1 = blue */
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add.l %d4, %d2 /* %d2 = green */
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add.l %d4, %d3 /* %d3 = red */
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move.l %d1, %d0 /* clamping */
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or.l %d2, %d0
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or.l %d3, %d0
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asr.l #6, %d0
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beq.s .yuv_all_ok2
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moveq.l #63, %d0
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cmp.l %d0, %d1
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bls.s .yuv_blue_ok2
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spl.b %d1
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and.l %d0, %d1
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.yuv_blue_ok2:
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cmp.l %d0, %d2
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bls.s .yuv_green_ok2
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spl.b %d2
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and.l %d0, %d2
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.yuv_green_ok2:
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cmp.l %d0, %d3
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bls.s .yuv_red_ok2
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spl.b %d3
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and.l %d0, %d3
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.yuv_red_ok2:
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.yuv_all_ok2:
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lsr.l #1, %d3 /* pack, convert to RGB565 and output */
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lsr.l #1, %d1
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lsl.l #6, %d3
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or.l %d3, %d2
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lsl.l #5, %d2
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or.l %d2, %d1
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move.w %d1, (%a0)
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cmp.l %a1,%a5 /* run %a1 up to end of line */
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bhi.w .yuv_line_loop1
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/* Rewind chroma pointers */
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movem.l (36+8, %sp), %a2-%a5 /* bu data, guv data, rv data, width */
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lea.l (%a1, %a5), %a5 /* next end address */
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.yuv_line_loop2:
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/* read saved chromas and sign extend */
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move.b (%a2)+, %d1
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extb.l %d1
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move.b (%a3)+, %d2
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extb.l %d2
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move.b (%a4)+, %d3
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extb.l %d3
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/* luma for first pixel */
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clr.l %d4 /* load y component */
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move.b (%a1)+, %d4
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moveq.l #74, %d0
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muls.w %d0, %d4 /* %d4 = 36 * Y */
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asr.l #8, %d4
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subq.l #4, %d4 /* correction for (Y - 16) and rounding */
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move.l %d4, %d5
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move.l %d4, %d6
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/* combine & write first pixel */
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add.l %d1, %d4 /* %d4 = blue */
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add.l %d2, %d5 /* %d5 = green */
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add.l %d3, %d6 /* %d6 = red */
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move.l %d4, %d0 /* clamping */
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or.l %d5, %d0
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or.l %d6, %d0
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asr.l #6, %d0
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beq.s .yuv_all_ok3
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moveq.l #63, %d0
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cmp.l %d0, %d4
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bls.s .yuv_blue_ok3
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spl.b %d4
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and.l %d0, %d4
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.yuv_blue_ok3:
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cmp.l %d0, %d5
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bls.s .yuv_green_ok3
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spl.b %d5
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and.l %d0, %d5
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.yuv_green_ok3:
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cmp.l %d0, %d6
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bls.s .yuv_red_ok3
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spl.b %d6
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and.l %d0, %d6
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.yuv_red_ok3:
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.yuv_all_ok3:
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lsr.l #1, %d6 /* pack, convert to RGB565 and output */
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lsr.l #1, %d4
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lsl.l #6, %d6
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or.l %d6, %d5
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lsl.l #5, %d5
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or.l %d5, %d4
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move.w %d4, (%a0)
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/* luma for second pixel */
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clr.l %d4 /* load y component */
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move.b (%a1)+, %d4
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moveq.l #74, %d0
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muls.w %d0, %d4 /* %d4 = 36 * Y */
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asr.l #8, %d4
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subq.l #4, %d4 /* correction for (Y - 16) and rounding */
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/* combine & write second pixel */
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add.l %d4, %d1 /* %d1 = blue */
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add.l %d4, %d2 /* %d2 = green */
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add.l %d4, %d3 /* %d3 = red */
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move.l %d1, %d0 /* clamping */
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or.l %d2, %d0
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or.l %d3, %d0
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asr.l #6, %d0
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beq.s .yuv_all_ok4
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moveq.l #63, %d0
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cmp.l %d0, %d1
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bls.s .yuv_blue_ok4
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spl.b %d1
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and.l %d0, %d1
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.yuv_blue_ok4:
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cmp.l %d0, %d2
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bls.s .yuv_green_ok4
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spl.b %d2
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and.l %d0, %d2
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.yuv_green_ok4:
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cmp.l %d0, %d3
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bls.s .yuv_red_ok4
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spl.b %d3
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and.l %d0, %d3
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.yuv_red_ok4:
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.yuv_all_ok4:
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lsr.l #1, %d3 /* pack, convert to RGB565 and output */
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lsr.l #1, %d1
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lsl.l #6, %d3
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or.l %d3, %d2
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lsl.l #5, %d2
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or.l %d2, %d1
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move.w %d1, (%a0)
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cmp.l %a1, %a5 /* run %a1 up to end of line */
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bhi.w .yuv_line_loop2
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movem.l (%sp), %d2-%d6/%a2-%a5
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lea.l (36, %sp), %sp /* restore registers */
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rts
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.lcd_write_yuv420_lines_end:
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.size lcd_write_yuv420_lines, .lcd_write_yuv420_lines_end - lcd_write_yuv420_lines
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