10363b3a81
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11281 a1c6a512-1295-4272-9138-f99709370657
445 lines
13 KiB
ArmAsm
445 lines
13 KiB
ArmAsm
/***************************************************************************
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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 Michael Sevakis
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* Based on lcd_write_data for H300 in lcd.S
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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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/* begin lcd_write_yuv420_lines
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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 -0.000001 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 RGB 666:
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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 0xf0008002,%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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/** Write first pixel **/
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clr.l %d1 /* get bu component */
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move.b (%a2),%d1
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clr.l %d3 /* get 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 /* multiply first term of guv */
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muls.w %d0,%d2
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moveq.l #-51,%d0 /* multiply second term of guv */
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muls.w %d3,%d0
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add.l %d0,%d2
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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
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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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clr.l %d4 /* get 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
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asr.l #8,%d4
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subq.l #4,%d4
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move.l %d4,%d5
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move.l %d4,%d6
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/* : %d4,%d5,%d6 = Y, %d1 = bu, %d2 = guv, %d3 = rv */
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add.l %d3,%d4 /* get r */
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add.l %d2,%d5 /* get g */
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add.l %d1,%d6 /* get b */
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move.l %d6,%d0 /* is clamping needed? */
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or.l %d5,%d0
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or.l %d4,%d0
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asr.l #6,%d0
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beq.b .yuv_no_clamp1 /* values in range: skip clamping */
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moveq.l #63, %d0
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cmp.l %d0, %d4
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bls.s .yuv_red_ok1
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spl.b %d4
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and.l %d0, %d4
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.yuv_red_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_blue_ok1
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spl.b %d6
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and.l %d0, %d6
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.yuv_blue_ok1:
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.yuv_no_clamp1:
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/* : %d4 = R, %d5 = G, %d6 = B */
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move.l %d5,%d0 /* save g for lower 9 bits */
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lsl.l #3,%d4 /* R << 3 */
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lsr.l #3,%d0 /* G >> 3 */
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or.l %d4,%d0
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move.w %d0,(%a0) /* |00000000|000000000|0000000r|rrrrrggg| */
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lsl.l #6,%d5 /* B << 6 */
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or.l %d5,%d6 /* |00000000|000000000|0000gggg|ggbbbbbb| */
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move.w %d6,(%a0)
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/** Write second pixel **/
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clr.l %d4
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move.b (%a1)+,%d4 /* get y component */
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moveq.l #74,%d0
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muls.w %d0,%d4
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asr.l #8,%d4
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subq.l #4,%d4
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/* : %d4 = Y, %d1 = bu, %d2 = guv, %d3 = rv */
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/* Add Y + each chroma component (can clobber %d1-%d3 values now) */
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add.l %d4,%d3 /* get r */
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add.l %d4,%d2 /* get g */
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add.l %d4,%d1 /* get b */
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move.l %d1,%d0 /* is clamping needed? */
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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.b .yuv_no_clamp2 /* values in range: skip clamping */
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moveq.l #63, %d0
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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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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, %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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.yuv_no_clamp2:
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/* : %d3 = R, %d2 = G, %d1 = B */
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move.l %d2,%d0 /* save g for lower 9 bits */
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lsl.l #3,%d3 /* R << 3 */
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lsr.l #3,%d0 /* G >> 3 */
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or.l %d3,%d0 /* |00000000|000000000|0000000r|rrrrrggg| */
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move.w %d0,(%a0)
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lsl.l #6,%d2 /* G << 6 */
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or.l %d2,%d1 /* |00000000|000000000|0000gggg|ggbbbbbb| */
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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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move.b (%a2)+,%d1 /* read save chromas and sign extend */
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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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clr.l %d4
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move.b (%a1)+,%d4 /* get y component */
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moveq.l #74,%d0
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muls.w %d0,%d4
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asr.l #8,%d4
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subq.l #4,%d4
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move.l %d4,%d5
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move.l %d4,%d6
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/* : %d4,%d5,%d6 = Y, %d1 = bu, %d2 = guv, %d3 = rv */
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add.l %d3,%d4 /* get r */
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add.l %d2,%d5 /* get g */
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add.l %d1,%d6 /* get b */
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move.l %d6,%d0 /* is clamping needed? */
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or.l %d5,%d0
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or.l %d4,%d0
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asr.l #6,%d0
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beq.b .yuv_no_clamp3 /* values in range: skip clamping */
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moveq.l #63, %d0
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cmp.l %d0, %d4
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bls.s .yuv_red_ok3
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spl.b %d4
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and.l %d0, %d4
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.yuv_red_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_blue_ok3
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spl.b %d6
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and.l %d0, %d6
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.yuv_blue_ok3:
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.yuv_no_clamp3:
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/* : %d4 = R, %d5 = G, %d6 = B */
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move.l %d5,%d0 /* save g for lower 9 bits */
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lsl.l #3,%d4 /* R << 3 */
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lsr.l #3,%d0 /* G >> 3 */
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or.l %d4,%d0
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move.w %d0,(%a0) /* |00000000|000000000|0000000r|rrrrrggg| */
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lsl.l #6,%d5 /* B << 6 */
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or.l %d5,%d6 /* |00000000|000000000|0000gggg|ggbbbbbb| */
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move.w %d6,(%a0)
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/** Write second pixel **/
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clr.l %d4
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move.b (%a1)+,%d4 /* get y component */
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moveq.l #74,%d0
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muls.w %d0,%d4
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asr.l #8,%d4
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subq.l #4,%d4
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/* : %d4 = Y, %d1 = bu, %d2 = guv, %d3 = rv */
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/* Add Y + each chroma component (can clobber %d1-%d3 values now) */
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add.l %d4,%d3 /* get r */
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add.l %d4,%d2 /* get g */
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add.l %d4,%d1 /* get b */
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move.l %d1,%d0 /* is clamping needed? */
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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.b .yuv_no_clamp4 /* values in range: skip clamping */
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moveq.l #63, %d0
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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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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, %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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.yuv_no_clamp4:
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/* : %d3 = R, %d2 = G, %d1 = B */
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move.l %d2,%d0 /* save g for lower 9 bits */
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lsl.l #3,%d3 /* R << 3 */
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lsr.l #3,%d0 /* G >> 3 */
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or.l %d3,%d0 /* |00000000|000000000|0000000r|rrrrrggg| */
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move.w %d0,(%a0)
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lsl.l #6,%d2 /* G << 6 */
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or.l %d2,%d1 /* |00000000|000000000|0000gggg|ggbbbbbb| */
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move.w %d1,(%a0)
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cmp.l %a1,%a5 /* run %a0 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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.yuv_end:
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.size lcd_write_yuv420_lines,.yuv_end-lcd_write_yuv420_lines
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/* end lcd_write_yuv420_lines */
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/* begin lcd_write_data */
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.align 2
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.global lcd_write_data
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.type lcd_write_data,@function
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lcd_write_data:
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move.l (4,%sp),%a0 /* data pointer */
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move.l (8,%sp),%d0 /* length in words */
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add.l %d0,%d0 /* words -> bytes */
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add.l %a0,%d0 /* -> end address */
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lea.l 0xf0008002,%a1 /* LCD data port */
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lea.l (-20,%sp),%sp /* free up some registers */
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movem.l %d2-%d5/%a2,(%sp)
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move.l %a0,%d1
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btst.l #1,%d1 /* already longword aligned? */
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beq.b .wd_wordl_end /* yes: skip initial word copy */
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/* transfer initial word */
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move.w (%a0)+,%d2 /* |????????|????????|rrrrrggg|gggbbbbb| */
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move.l %d2,%d1
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lsr.l #7,%d1 /* |0000000?|????????|???????r|rrrrgggg| */
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move.w %d1,(%a1) /* ^ ^^^^^^^ */
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lsl.l #1,%d2 /* |????????|???????r|rrrrgggg|ggbbbbb0| */
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move.w %d2,(%a1) /* ^ ^^^^^^^ */
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.wd_wordl_end: /* now longword aligned */
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moveq.l #28,%d1
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add.l %a0,%d1
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and.l #0xFFFFFFF0,%d1 /* %d1 = second line bound */
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cmp.l %d1,%d0 /* at least one full line to send? */
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blo.w .wd_long2_start /* no: skip to trailing longword handling */
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subq.l #8,%d1
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subq.l #8,%d1 /* %d1 = first line bound */
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cmp.l %a0,%d1 /* any leading longwords? */
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bls.b .wd_long1_end /* no: skip leading long loop */
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.wd_long1_loop:
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move.l (%a0)+,%d2 /* read longword */
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swap %d2 /* |rrrrrggg|gggbbbbb|RRRRRGGG|GGGBBBBB| */
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move.l %d2,%d5
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lsr.l #7,%d5 /* |0000000r|rrrrgggg|ggbbbbbR|RRRRGGGG| */
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move.w %d5,(%a1) /* ^ ^^^^^^^ */
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lsl.l #1,%d2 /* |rrrrgggg|ggbbbbbR|RRRRGGGG|GGBBBBB0| */
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move.w %d2,(%a1) /* ^ ^^^^^^^ */
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swap %d5 /* |ggbbbbbR|RRRRGGGG|0000000r|rrrrgggg| */
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move.w %d5,(%a1) /* ^ ^^^^^^^ */
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swap %d2 /* |RRRRBGGG|GGBBBBB0|rrrrgggg|ggbbbbbR| */
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move.w %d2,(%a1) /* ^ ^^^^^^^ */
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cmp.l %a0,%d1
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bhi.b .wd_long1_loop
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.wd_long1_end:
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move.l %d0,%a2
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lea.l (-14,%a2),%a2
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.wd_line_loop:
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movem.l (%a0),%d1-%d4 /* burst-read eight words */
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lea.l (16,%a0),%a0 /* increment address */
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/* transfer four pairs of longs to display */
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swap %d1
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move.l %d1,%d5
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lsr.l #7,%d5
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move.w %d5,(%a1)
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lsl.l #1,%d1
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move.w %d1,(%a1)
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swap %d5
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move.w %d5,(%a1)
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swap %d1
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move.w %d1,(%a1)
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swap %d2
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move.l %d2,%d5
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lsr.l #7,%d5
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move.w %d5,(%a1)
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lsl.l #1,%d2
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move.w %d2,(%a1)
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swap %d5
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move.w %d5,(%a1)
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swap %d2
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move.w %d2,(%a1)
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swap %d3
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move.l %d3,%d5
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lsr.l #7,%d5
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move.w %d5,(%a1)
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lsl.l #1,%d3
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move.w %d3,(%a1)
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swap %d5
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move.w %d5,(%a1)
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swap %d3
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move.w %d3,(%a1)
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swap %d4
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move.l %d4,%d5
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lsr.l #7,%d5
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move.w %d5,(%a1)
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lsl.l #1,%d4
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move.w %d4,(%a1)
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swap %d5
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move.w %d5,(%a1)
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swap %d4
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move.w %d4,(%a1)
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cmp.l %a0,%a2 /* run %a0 up to last line bound */
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bhi.w .wd_line_loop
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.wd_long2_start:
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subq.l #2,%d0 /* account for handling 2 words per loop */
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cmp.l %a0,%d0 /* any (trailing longwords? */
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bls.b .wd_long2_end /* no: skip trailing longword loop */
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.wd_long2_loop:
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move.l (%a0)+,%d2 /* read longword */
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swap %d2
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move.l %d2,%d5
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lsr.l #7,%d5
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move.w %d5,(%a1)
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lsl.l #1,%d2
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move.w %d2,(%a1)
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swap %d5
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move.w %d5,(%a1)
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swap %d2
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move.w %d2,(%a1)
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cmp.l %a0,%d0 /* run %a0 up to last long bound */
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bhi.b .wd_long2_loop
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|
|
.wd_long2_end:
|
|
blo.b .wd_word2_end /* no final word: skip */
|
|
|
|
move.w (%a0)+,%d2 /* transfer final word */
|
|
move.l %d2,%d1
|
|
lsr.l #7,%d1
|
|
move.w %d1,(%a1)
|
|
lsl.l #1,%d2
|
|
move.w %d2,(%a1)
|
|
|
|
.wd_word2_end:
|
|
movem.l (%sp),%d2-%d5/%a2
|
|
lea.l (20,%sp),%sp /* restore registers */
|
|
rts
|
|
|
|
.wd_end:
|
|
.size lcd_write_data,.wd_end-lcd_write_data
|
|
/* end lcd_write_data */
|