2009-05-25 21:10:45 +00:00
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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) 2007 by Jens Arnold
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* Heavily based on lcd-as-memframe.c by Michael Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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/****************************************************************************
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2012-01-11 12:14:30 +00:00
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* void lcd_write_yuv420_lines(unsigned char const * const src[3],
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2009-05-25 21:10:45 +00:00
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* int width,
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* int stride);
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*
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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 565:
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* |R| |74 0 101| |Y' - 16| >> 9
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* |G| = |74 -24 -51| |Cb - 128| >> 8
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* |B| |74 128 0| |Cr - 128| >> 9
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*
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* Write four RGB565 pixels in the following order on each loop:
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* 1 3 + > down
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* 2 4 \/ left
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*/
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.section .icode, "ax", %progbits
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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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@ r0 = yuv_src
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@ r1 = width
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@ r2 = stride
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2009-07-11 23:43:44 +00:00
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stmfd sp!, { r4-r10, lr } @ save non-scratch
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2009-05-25 21:10:45 +00:00
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ldmia r0, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
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@ r5 = yuv_src[1] = Cb_p
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@ r6 = yuv_src[2] = Cr_p
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@ r0 = scratch
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sub r2, r2, #1 @
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mov r3, #0x70000000 @
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orr r3, r3, #0x3000 @ r3 = LCD1_BASE
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10: @ loop line @
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ldrb r7, [r4], #1 @ r7 = *Y'_p++;
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ldrb r8, [r5], #1 @ r8 = *Cb_p++;
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ldrb r9, [r6], #1 @ r9 = *Cr_p++;
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@
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sub r7, r7, #16 @ r7 = Y = (Y' - 16)*74
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add r12, r7, r7, asl #2 @ actually (Y' - 16)*37 and shift right
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add r7, r12, r7, asl #5 @ by one less when adding - same for all
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@
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sub r8, r8, #128 @ Cb -= 128
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sub r9, r9, #128 @ Cr -= 128
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@
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add r10, r9, r9, asl #1 @ r10 = Cr*51 + Cb*24
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add r10, r10, r10, asl #4 @
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add r10, r10, r8, asl #3 @
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add r10, r10, r8, asl #4 @
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@
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2009-07-11 23:43:44 +00:00
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add lr, r9, r9, asl #2 @ r9 = Cr*101
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add lr, lr, r9, asl #5 @
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add r9, lr, r9, asl #6 @
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2009-05-25 21:10:45 +00:00
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@
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add r8, r8, #2 @ r8 = bu = (Cb*128 + 128) >> 8
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mov r8, r8, asr #2 @
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add r9, r9, #256 @ r9 = rv = (r9 + 256) >> 9
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mov r9, r9, asr #9 @
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rsb r10, r10, #128 @ r10 = guv = (-r10 + 128) >> 8
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mov r10, r10, asr #8 @
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@ compute R, G, and B
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add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
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2009-07-11 23:43:44 +00:00
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add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
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2009-05-25 21:10:45 +00:00
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add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
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@
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2009-07-11 23:43:44 +00:00
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orr r12, r0, lr @ check if clamping is needed...
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2009-05-25 21:10:45 +00:00
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orr r12, r12, r7, asr #1 @ ...at all
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cmp r12, #31 @
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bls 15f @ no clamp @
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cmp r0, #31 @ clamp b
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mvnhi r0, r0, asr #31 @
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andhi r0, r0, #31 @
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2009-07-11 23:43:44 +00:00
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cmp lr, #31 @ clamp r
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mvnhi lr, lr, asr #31 @
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andhi lr, lr, #31 @
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2009-05-25 21:10:45 +00:00
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cmp r7, #63 @ clamp g
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mvnhi r7, r7, asr #31 @
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andhi r7, r7, #63 @
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15: @ no clamp @
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@
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ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride)
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@
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2009-07-11 23:43:44 +00:00
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mov lr, lr, lsl #3 @
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orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
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2009-05-25 21:10:45 +00:00
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orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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2009-07-11 23:43:44 +00:00
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str lr, [r3, #0x10] @ send MSB
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2009-05-25 21:10:45 +00:00
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1: @busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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str r0, [r3, #0x10] @ send LSB
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*74
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add r12, r7, r7, asl #2 @
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add r7, r12, r7, asl #5 @
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@ compute R, G, and B
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add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
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2009-07-11 23:43:44 +00:00
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add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
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2009-05-25 21:10:45 +00:00
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add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
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@
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2009-07-11 23:43:44 +00:00
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orr r12, r0, lr @ check if clamping is needed...
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2009-05-25 21:10:45 +00:00
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orr r12, r12, r7, asr #1 @ ...at all
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cmp r12, #31 @
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bls 15f @ no clamp @
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cmp r0, #31 @ clamp b
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mvnhi r0, r0, asr #31 @
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andhi r0, r0, #31 @
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2009-07-11 23:43:44 +00:00
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cmp lr, #31 @ clamp r
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mvnhi lr, lr, asr #31 @
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andhi lr, lr, #31 @
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2009-05-25 21:10:45 +00:00
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cmp r7, #63 @ clamp g
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mvnhi r7, r7, asr #31 @
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andhi r7, r7, #63 @
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15: @ no clamp @
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@
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ldrb r12, [r4], #1 @ r12 = Y' = *(Y'_p++)
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@
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2009-07-11 23:43:44 +00:00
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mov lr, lr, lsl #3 @
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orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
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2009-05-25 21:10:45 +00:00
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orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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2009-07-11 23:43:44 +00:00
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str lr, [r3, #0x10] @ send MSB
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2009-05-25 21:10:45 +00:00
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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str r0, [r3, #0x10] @ send LSB
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*74
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add r12, r7, r7, asl #2 @
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add r7, r12, r7, asl #5 @
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@ compute R, G, and B
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add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
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2009-07-11 23:43:44 +00:00
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add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
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2009-05-25 21:10:45 +00:00
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add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
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@
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2009-07-11 23:43:44 +00:00
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orr r12, r0, lr @ check if clamping is needed...
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2009-05-25 21:10:45 +00:00
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orr r12, r12, r7, asr #1 @ ...at all
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cmp r12, #31 @
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bls 15f @ no clamp @
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cmp r0, #31 @ clamp b
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mvnhi r0, r0, asr #31 @
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andhi r0, r0, #31 @
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2009-07-11 23:43:44 +00:00
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cmp lr, #31 @ clamp r
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mvnhi lr, lr, asr #31 @
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andhi lr, lr, #31 @
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2009-05-25 21:10:45 +00:00
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cmp r7, #63 @ clamp g
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mvnhi r7, r7, asr #31 @
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andhi r7, r7, #63 @
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15: @ no clamp @
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@
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ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride)
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@
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@
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2009-07-11 23:43:44 +00:00
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mov lr, lr, lsl #3 @
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orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
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2009-05-25 21:10:45 +00:00
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orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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2009-07-11 23:43:44 +00:00
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str lr, [r3, #0x10] @ send MSB
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2009-05-25 21:10:45 +00:00
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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str r0, [r3, #0x10] @ send LSB
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@
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sub r7, r12, #16 @ r7 = Y = (Y' - 16)*74
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add r12, r7, r7, asl #2 @
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add r7, r12, r7, asl #5 @
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@ compute R, G, and B
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add r0, r8, r7, asr #8 @ r0 = b = (Y >> 9) + bu
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2009-07-11 23:43:44 +00:00
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add lr, r9, r7, asr #8 @ lr = r = (Y >> 9) + rv
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2009-05-25 21:10:45 +00:00
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add r7, r10, r7, asr #7 @ r7 = g = (Y >> 8) + guv
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@
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2009-07-11 23:43:44 +00:00
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orr r12, r0, lr @ check if clamping is needed...
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2009-05-25 21:10:45 +00:00
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orr r12, r12, r7, asr #1 @ ...at all
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cmp r12, #31 @
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bls 15f @ no clamp @
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cmp r0, #31 @ clamp b
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mvnhi r0, r0, asr #31 @
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andhi r0, r0, #31 @
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2009-07-11 23:43:44 +00:00
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cmp lr, #31 @ clamp r
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mvnhi lr, lr, asr #31 @
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andhi lr, lr, #31 @
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2009-05-25 21:10:45 +00:00
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cmp r7, #63 @ clamp g
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mvnhi r7, r7, asr #31 @
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andhi r7, r7, #63 @
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15: @ no clamp @
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@
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2009-07-11 23:43:44 +00:00
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mov lr, lr, lsl #3 @
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orr lr, lr, r7, lsr #3 @ lr = (r << 3) | (g >> 3)
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2009-05-25 21:10:45 +00:00
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orr r0, r0, r7, lsl #5 @ r0 = (g << 5) | b
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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2009-07-11 23:43:44 +00:00
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str lr, [r3, #0x10] @ send MSB
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2009-05-25 21:10:45 +00:00
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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str r0, [r3, #0x10] @ send LSB
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@
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subs r1, r1, #2 @ subtract block from width
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bgt 10b @ loop line @
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@
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2010-06-11 04:41:36 +00:00
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ldmpc regs=r4-r10 @ restore registers and return
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2009-05-25 21:10:45 +00:00
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.ltorg @ dump constant pool
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.size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines
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/****************************************************************************
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2012-01-11 12:14:30 +00:00
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* void lcd_write_yuv420_lines_odither(unsigned char const * const src[3],
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2009-05-25 21:10:45 +00:00
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* int width,
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* int stride,
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* int x_screen,
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* int y_screen);
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*
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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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|
|
* Red scaled at twice g & b but at same precision to place it in correct
|
|
|
|
|
* bit position after multiply and leave instruction count lower.
|
|
|
|
|
* |R| |258 0 408| |Y' - 16|
|
|
|
|
|
* |G| = |149 -49 -104| |Cb - 128|
|
|
|
|
|
* |B| |149 258 0| |Cr - 128|
|
|
|
|
|
*
|
|
|
|
|
* Write four RGB565 pixels in the following order on each loop:
|
|
|
|
|
* 1 3 + > down
|
|
|
|
|
* 2 4 \/ left
|
|
|
|
|
*
|
|
|
|
|
* Kernel pattern (raw|rotated|use order):
|
|
|
|
|
* 5 3 4 2 2 6 3 7 row0 row2 > down
|
|
|
|
|
* 1 7 0 6 | 4 0 5 1 | 2 4 6 0 3 5 7 1 col0 left
|
|
|
|
|
* 4 2 5 3 | 3 7 2 6 | 3 5 7 1 2 4 6 0 col2 \/
|
|
|
|
|
* 0 6 1 7 5 1 4 0
|
|
|
|
|
*/
|
|
|
|
|
.section .icode, "ax", %progbits
|
|
|
|
|
.align 2
|
|
|
|
|
.global lcd_write_yuv420_lines_odither
|
|
|
|
|
.type lcd_write_yuv420_lines_odither, %function
|
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|
|
lcd_write_yuv420_lines_odither:
|
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|
|
|
@ r0 = yuv_src
|
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|
|
|
@ r1 = width
|
|
|
|
|
@ r2 = stride
|
|
|
|
|
@ r3 = x_screen
|
|
|
|
|
@ [sp] = y_screen
|
2009-07-11 23:43:44 +00:00
|
|
|
stmfd sp!, { r4-r11, lr } @ save non-scratch
|
2009-05-25 21:10:45 +00:00
|
|
|
ldmia r0, { r4, r5, r6 } @ r4 = yuv_src[0] = Y'_p
|
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|
|
|
@ r5 = yuv_src[1] = Cb_p
|
|
|
|
|
@ r6 = yuv_src[2] = Cr_p
|
|
|
|
|
@
|
|
|
|
|
sub r2, r2, #1 @
|
2010-05-24 18:57:11 +00:00
|
|
|
ldr r14, [sp, #36] @ Line up pattern and kernel quadrant
|
2009-05-25 21:10:45 +00:00
|
|
|
eor r14, r14, r3 @
|
|
|
|
|
and r14, r14, #0x2 @
|
|
|
|
|
mov r14, r14, lsl #6 @ 0x00 or 0x80
|
|
|
|
|
mov r3, #0x70000000 @
|
|
|
|
|
orr r3, r3, #0x3000 @ r3 = LCD1_BASE
|
|
|
|
|
10: @ loop line @
|
|
|
|
|
@
|
|
|
|
|
ldrb r7, [r4], #1 @ r7 = *Y'_p++;
|
|
|
|
|
ldrb r8, [r5], #1 @ r8 = *Cb_p++;
|
|
|
|
|
ldrb r9, [r6], #1 @ r9 = *Cr_p++;
|
|
|
|
|
@
|
|
|
|
|
eor r14, r14, #0x80 @ flip pattern quadrant
|
|
|
|
|
@
|
|
|
|
|
sub r7, r7, #16 @ r7 = Y = (Y' - 16)*149
|
|
|
|
|
add r12, r7, r7, asl #2 @
|
|
|
|
|
add r12, r12, r12, asl #4 @
|
|
|
|
|
add r7, r12, r7, asl #6 @
|
|
|
|
|
@
|
|
|
|
|
sub r8, r8, #128 @ Cb -= 128
|
|
|
|
|
sub r9, r9, #128 @ Cr -= 128
|
|
|
|
|
@
|
|
|
|
|
add r10, r8, r8, asl #4 @ r10 = guv = Cr*104 + Cb*49
|
|
|
|
|
add r10, r10, r8, asl #5 @
|
|
|
|
|
add r10, r10, r9, asl #3 @
|
|
|
|
|
add r10, r10, r9, asl #5 @
|
|
|
|
|
add r10, r10, r9, asl #6 @
|
|
|
|
|
@
|
|
|
|
|
mov r8, r8, asl #1 @ r8 = bu = Cb*258
|
|
|
|
|
add r8, r8, r8, asl #7 @
|
|
|
|
|
@
|
|
|
|
|
add r9, r9, r9, asl #1 @ r9 = rv = Cr*408
|
|
|
|
|
add r9, r9, r9, asl #4 @
|
|
|
|
|
mov r9, r9, asl #3 @
|
|
|
|
|
@
|
|
|
|
|
@ compute R, G, and B
|
|
|
|
|
add r0, r8, r7 @ r0 = b' = Y + bu
|
|
|
|
|
add r11, r9, r7, asl #1 @ r11 = r' = Y*2 + rv
|
|
|
|
|
rsb r7, r10, r7 @ r7 = g' = Y + guv
|
|
|
|
|
@
|
|
|
|
|
@ r8 = bu, r9 = rv, r10 = guv
|
|
|
|
|
@
|
|
|
|
|
sub r12, r0, r0, lsr #5 @ r0 = 31/32*b + b/256
|
|
|
|
|
add r0, r12, r0, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r11, r11, lsr #5 @ r11 = 31/32*r + r/256
|
|
|
|
|
add r11, r12, r11, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r7, r7, lsr #6 @ r7 = 63/64*g + g/256
|
|
|
|
|
add r7, r12, r7, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
add r12, r14, #0x100 @
|
|
|
|
|
@
|
|
|
|
|
add r0, r0, r12 @ b = r0 + delta
|
|
|
|
|
add r11, r11, r12, lsl #1 @ r = r11 + delta*2
|
|
|
|
|
add r7, r7, r12, lsr #1 @ g = r7 + delta/2
|
|
|
|
|
@
|
|
|
|
|
orr r12, r0, r11, asr #1 @ check if clamping is needed...
|
|
|
|
|
orr r12, r12, r7 @ ...at all
|
|
|
|
|
movs r12, r12, asr #15 @
|
|
|
|
|
beq 15f @ no clamp @
|
|
|
|
|
movs r12, r0, asr #15 @ clamp b
|
|
|
|
|
mvnne r0, r12, lsr #15 @
|
|
|
|
|
andne r0, r0, #0x7c00 @ mask b only if clamped
|
|
|
|
|
movs r12, r11, asr #16 @ clamp r
|
|
|
|
|
mvnne r11, r12, lsr #16 @
|
|
|
|
|
movs r12, r7, asr #15 @ clamp g
|
|
|
|
|
mvnne r7, r12, lsr #15 @
|
|
|
|
|
15: @ no clamp @
|
|
|
|
|
@
|
|
|
|
|
ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride)
|
|
|
|
|
@
|
|
|
|
|
|
|
|
|
|
and r11, r11, #0xf800 @ pack pixel
|
|
|
|
|
mov r11, r11, lsr #8
|
|
|
|
|
and r7, r7, #0x7e00
|
|
|
|
|
orr r11, r11, r7, lsr #12
|
|
|
|
|
mov r7, r7, lsr#4
|
|
|
|
|
orr r0, r7, r0, lsr #10
|
|
|
|
|
1: @ busy @
|
|
|
|
|
ldr r7, [r3] @ r7 = LCD1_BASE
|
|
|
|
|
tst r7, #LCD1_BUSY_MASK @ bridge busy?
|
|
|
|
|
bne 1b @
|
|
|
|
|
str r11, [r3, #0x10] @ send MSB
|
|
|
|
|
1: @ busy @
|
|
|
|
|
ldr r7, [r3] @ r7 = LCD1_BASE
|
|
|
|
|
tst r7, #LCD1_BUSY_MASK @ bridge busy?
|
|
|
|
|
bne 1b @
|
|
|
|
|
str r0, [r3, #0x10] @ send LSB
|
|
|
|
|
@
|
|
|
|
|
sub r7, r12, #16 @ r7 = Y = (Y' - 16)*149
|
|
|
|
|
add r12, r7, r7, asl #2 @
|
|
|
|
|
add r12, r12, r12, asl #4 @
|
|
|
|
|
add r7, r12, r7, asl #6 @
|
|
|
|
|
@ compute R, G, and B
|
|
|
|
|
add r0, r8, r7 @ r0 = b' = Y + bu
|
|
|
|
|
add r11, r9, r7, asl #1 @ r11 = r' = Y*2 + rv
|
|
|
|
|
rsb r7, r10, r7 @ r7 = g' = Y + guv
|
|
|
|
|
@
|
|
|
|
|
sub r12, r0, r0, lsr #5 @ r0 = 31/32*b' + b'/256
|
|
|
|
|
add r0, r12, r0, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r11, r11, lsr #5 @ r11 = 31/32*r' + r'/256
|
|
|
|
|
add r11, r12, r11, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r7, r7, lsr #6 @ r7 = 63/64*g' + g'/256
|
|
|
|
|
add r7, r12, r7, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
add r12, r14, #0x200 @
|
|
|
|
|
@
|
|
|
|
|
add r0, r0, r12 @ b = r0 + delta
|
|
|
|
|
add r11, r11, r12, lsl #1 @ r = r11 + delta*2
|
|
|
|
|
add r7, r7, r12, lsr #1 @ g = r7 + delta/2
|
|
|
|
|
@
|
|
|
|
|
orr r12, r0, r11, asr #1 @ check if clamping is needed...
|
|
|
|
|
orr r12, r12, r7 @ ...at all
|
|
|
|
|
movs r12, r12, asr #15 @
|
|
|
|
|
beq 15f @ no clamp @
|
|
|
|
|
movs r12, r0, asr #15 @ clamp b
|
|
|
|
|
mvnne r0, r12, lsr #15 @
|
|
|
|
|
andne r0, r0, #0x7c00 @ mask b only if clamped
|
|
|
|
|
movs r12, r11, asr #16 @ clamp r
|
|
|
|
|
mvnne r11, r12, lsr #16 @
|
|
|
|
|
movs r12, r7, asr #15 @ clamp g
|
|
|
|
|
mvnne r7, r12, lsr #15 @
|
|
|
|
|
15: @ no clamp @
|
|
|
|
|
@
|
|
|
|
|
ldrb r12, [r4], #1 @ r12 = Y' = *(Y'_p++)
|
|
|
|
|
|
|
|
|
|
and r11, r11, #0xf800 @ pack pixel
|
|
|
|
|
mov r11, r11, lsr #8
|
|
|
|
|
and r7, r7, #0x7e00
|
|
|
|
|
orr r11, r11, r7, lsr #12
|
|
|
|
|
mov r7, r7, lsr#4
|
|
|
|
|
orr r0, r7, r0, lsr #10
|
|
|
|
|
1: @ busy @
|
|
|
|
|
ldr r7, [r3] @ r7 = LCD1_BASE
|
|
|
|
|
tst r7, #LCD1_BUSY_MASK @ bridge busy?
|
|
|
|
|
bne 1b @
|
|
|
|
|
str r11, [r3, #0x10] @ send MSB
|
|
|
|
|
1: @ busy @
|
|
|
|
|
ldr r7, [r3] @ r7 = LCD1_BASE
|
|
|
|
|
tst r7, #LCD1_BUSY_MASK @ bridge busy?
|
|
|
|
|
bne 1b @
|
|
|
|
|
str r0, [r3, #0x10] @ send LSB
|
|
|
|
|
|
|
|
|
|
sub r7, r12, #16 @ r7 = Y = (Y' - 16)*149
|
|
|
|
|
add r12, r7, r7, asl #2 @
|
|
|
|
|
add r12, r12, r12, asl #4 @
|
|
|
|
|
add r7, r12, r7, asl #6 @
|
|
|
|
|
@ compute R, G, and B
|
|
|
|
|
add r0, r8, r7 @ r0 = b' = Y + bu
|
|
|
|
|
add r11, r9, r7, asl #1 @ r11 = r' = Y*2 + rv
|
|
|
|
|
rsb r7, r10, r7 @ r7 = g' = Y + guv
|
|
|
|
|
@
|
|
|
|
|
@ r8 = bu, r9 = rv, r10 = guv
|
|
|
|
|
@
|
|
|
|
|
sub r12, r0, r0, lsr #5 @ r0 = 31/32*b' + b'/256
|
|
|
|
|
add r0, r12, r0, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r11, r11, lsr #5 @ r11 = 31/32*r' + r'/256
|
|
|
|
|
add r11, r12, r11, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r7, r7, lsr #6 @ r7 = 63/64*g' + g'/256
|
|
|
|
|
add r7, r12, r7, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
add r12, r14, #0x300 @
|
|
|
|
|
@
|
|
|
|
|
add r0, r0, r12 @ b = r0 + delta
|
|
|
|
|
add r11, r11, r12, lsl #1 @ r = r11 + delta*2
|
|
|
|
|
add r7, r7, r12, lsr #1 @ g = r7 + delta/2
|
|
|
|
|
@
|
|
|
|
|
orr r12, r0, r11, asr #1 @ check if clamping is needed...
|
|
|
|
|
orr r12, r12, r7 @ ...at all
|
|
|
|
|
movs r12, r12, asr #15 @
|
|
|
|
|
beq 15f @ no clamp @
|
|
|
|
|
movs r12, r0, asr #15 @ clamp b
|
|
|
|
|
mvnne r0, r12, lsr #15 @
|
|
|
|
|
andne r0, r0, #0x7c00 @ mask b only if clamped
|
|
|
|
|
movs r12, r11, asr #16 @ clamp r
|
|
|
|
|
mvnne r11, r12, lsr #16 @
|
|
|
|
|
movs r12, r7, asr #15 @ clamp g
|
|
|
|
|
mvnne r7, r12, lsr #15 @
|
|
|
|
|
15: @ no clamp @
|
|
|
|
|
@
|
|
|
|
|
ldrb r12, [r4, r2] @ r12 = Y' = *(Y'_p + stride)
|
|
|
|
|
|
|
|
|
|
and r11, r11, #0xf800 @ pack pixel
|
|
|
|
|
mov r11, r11, lsr #8
|
|
|
|
|
and r7, r7, #0x7e00
|
|
|
|
|
orr r11, r11, r7, lsr #12
|
|
|
|
|
mov r7, r7, lsr#4
|
|
|
|
|
orr r0, r7, r0, lsr #10
|
|
|
|
|
1: @ busy @
|
|
|
|
|
ldr r7, [r3] @ r7 = LCD1_BASE
|
|
|
|
|
tst r7, #LCD1_BUSY_MASK @ bridge busy?
|
|
|
|
|
bne 1b @
|
|
|
|
|
str r11, [r3, #0x10] @ send MSB
|
|
|
|
|
1: @ busy @
|
|
|
|
|
ldr r7, [r3] @ r7 = LCD1_BASE
|
|
|
|
|
tst r7, #LCD1_BUSY_MASK @ bridge busy?
|
|
|
|
|
bne 1b @
|
|
|
|
|
str r0, [r3, #0x10] @ send LSB
|
|
|
|
|
|
|
|
|
|
sub r7, r12, #16 @ r7 = Y = (Y' - 16)*149
|
|
|
|
|
add r12, r7, r7, asl #2 @
|
|
|
|
|
add r12, r12, r12, asl #4 @
|
|
|
|
|
add r7, r12, r7, asl #6 @
|
|
|
|
|
@ compute R, G, and B
|
|
|
|
|
add r0, r8, r7 @ r0 = b' = Y + bu
|
|
|
|
|
add r11, r9, r7, asl #1 @ r11 = r' = Y*2 + rv
|
|
|
|
|
rsb r7, r10, r7 @ r7 = g' = Y + guv
|
|
|
|
|
@
|
|
|
|
|
sub r12, r0, r0, lsr #5 @ r0 = 31/32*b + b/256
|
|
|
|
|
add r0, r12, r0, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r11, r11, lsr #5 @ r11 = 31/32*r + r/256
|
|
|
|
|
add r11, r12, r11, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
sub r12, r7, r7, lsr #6 @ r7 = 63/64*g + g/256
|
|
|
|
|
add r7, r12, r7, lsr #8 @
|
|
|
|
|
@
|
|
|
|
|
@ This element is zero - use r14 @
|
|
|
|
|
@
|
|
|
|
|
add r0, r0, r14 @ b = r0 + delta
|
|
|
|
|
add r11, r11, r14, lsl #1 @ r = r11 + delta*2
|
|
|
|
|
add r7, r7, r14, lsr #1 @ g = r7 + delta/2
|
|
|
|
|
@
|
|
|
|
|
orr r12, r0, r11, asr #1 @ check if clamping is needed...
|
|
|
|
|
orr r12, r12, r7 @ ...at all
|
|
|
|
|
movs r12, r12, asr #15 @
|
|
|
|
|
beq 15f @ no clamp @
|
|
|
|
|
movs r12, r0, asr #15 @ clamp b
|
|
|
|
|
mvnne r0, r12, lsr #15 @
|
|
|
|
|
andne r0, r0, #0x7c00 @ mask b only if clamped
|
|
|
|
|
movs r12, r11, asr #16 @ clamp r
|
|
|
|
|
mvnne r11, r12, lsr #16 @
|
|
|
|
|
movs r12, r7, asr #15 @ clamp g
|
|
|
|
|
mvnne r7, r12, lsr #15 @
|
|
|
|
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15: @ no clamp @
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and r11, r11, #0xf800 @ pack pixel
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mov r11, r11, lsr #8
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and r7, r7, #0x7e00
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orr r11, r11, r7, lsr #12
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mov r7, r7, lsr#4
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orr r0, r7, r0, lsr #10
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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str r11, [r3, #0x10] @ send MSB
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1: @ busy @
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ldr r7, [r3] @ r7 = LCD1_BASE
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tst r7, #LCD1_BUSY_MASK @ bridge busy?
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bne 1b @
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str r0, [r3, #0x10] @ send LSB
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subs r1, r1, #2 @ subtract block from width
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bgt 10b @ loop line @
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@
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2010-06-11 04:41:36 +00:00
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ldmpc regs=r4-r11 @ restore registers and return
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2009-05-25 21:10:45 +00:00
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.ltorg @ dump constant pool
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.size lcd_write_yuv420_lines_odither, .-lcd_write_yuv420_lines_odither
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