223 lines
11 KiB
ArmAsm
223 lines
11 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) 2007 by Michael Sevakis
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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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/****************************************************************************
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* void lcd_write_yuv_420_lines(fb_data *dst,
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* unsigned char chroma_buf[LCD_HEIGHT/2*3],
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unsigned char const * const src[3],
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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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.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 = dst
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@ r1 = chroma_buf
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@ r2 = yuv_src
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@ r3 = width
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@ [sp] = stride
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stmdb sp!, { r4-r12, lr } @ save non-scratch
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stmdb sp!, { r0, r3 } @ save dst and width
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mov r14, #74 @ r14 = Y factor
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ldmia r2, { 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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10: @ loop line 1 @
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ldrb r2, [r4], #1 @ r2 = *Y'_p++;
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ldrb r8, [r5], #1 @ r8 = *Cb_p++;
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ldrb r11, [r6], #1 @ r11 = *Cr_p++;
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@
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@ compute Y
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sub r2, r2, #16 @ r7 = Y = (Y' - 16)*74
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mul r7, r2, r14 @
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@
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sub r8, r8, #128 @ Cb -= 128
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sub r11, r11, #128 @ Cr -= 128
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@
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mvn r2, #24 @ compute guv
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mul r10, r2, r8 @ r10 = Cb*-24
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mvn r2, #51 @
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mla r10, r2, r11, r10 @ r10 = r10 + Cr*-51
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@
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mov r2, #101 @ compute rv
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mul r9, r11, r2 @ r9 = rv = Cr*101
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@
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@ store chromas in line buffer
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add r8, r8, #2 @ bu = (Cb + 2) >> 2
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mov r8, r8, asr #2 @
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strb r8, [r1], #1 @
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add r9, r9, #256 @ rv = (Cr + 256) >> 9
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mov r9, r9, asr #9 @
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strb r9, [r1], #1 @
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mov r10, r10, asr #8 @ guv >>= 8
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strb r10, [r1], #1 @
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@ compute R, G, and B
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add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
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add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
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add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
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@
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orr r12, r2, r11 @ check if clamping is needed...
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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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mov r12, #31 @
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cmp r12, r2 @ clamp b
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andlo r2, r12, r2, asr #31 @
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eorlo r2, r2, r12 @
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cmp r12, r11 @ clamp r
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andlo r11, r12, r11, asr #31 @
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eorlo r11, r11, r12 @
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cmp r12, r7, asr #1 @ clamp g
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andlo r7, r12, r7, asr #31 @
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eorlo r7, r7, r12 @
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orrlo r7, r7, r7, asl #1 @
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15: @ no clamp @
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@
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orr r12, r2, r7, lsl #5 @ r4 |= (g << 5)
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ldrb r2, [r4], #1 @ r2 = Y' = *Y'_p++
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orr r12, r12, r11, lsl #11 @ r4 = b | (r << 11)
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strh r12, [r0], #240 @ store pixel
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@
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sub r2, r2, #16 @ r7 = Y = (Y' - 16)*74
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mul r7, r2, r14 @ next Y
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@ compute R, G, and B
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add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
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add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
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add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
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@
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orr r12, r2, r11 @ check if clamping is needed...
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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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mov r12, #31 @
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cmp r12, r2 @ clamp b
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andlo r2, r12, r2, asr #31 @
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eorlo r2, r2, r12 @
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cmp r12, r11 @ clamp r
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andlo r11, r12, r11, asr #31 @
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eorlo r11, r11, r12 @
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cmp r12, r7, asr #1 @ clamp g
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andlo r7, r12, r7, asr #31 @
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eorlo r7, r7, r12 @
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orrlo r7, r7, r7, asl #1 @
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15: @ no clamp @
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@
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orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
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orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
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strh r12, [r0, #240]! @ store pixel
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add r0, r0, #2*240 @
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@
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subs r3, r3, #2 @
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bgt 10b @ loop line 1 @
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@ do second line
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@
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ldmia sp!, { r0, r3 } @ pop dst and width
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sub r0, r0, #2 @ set dst to start of next line
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sub r1, r1, r3, asl #1 @ rewind chroma pointer...
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ldr r2, [sp, #40] @ r2 = stride
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add r1, r1, r3, asr #1 @ ... (r1 -= width/2*3)
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@ move sources to start of next line
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sub r2, r2, r3 @ r2 = skip = stride - width
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add r4, r4, r2 @ r4 = Y'_p + skip
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@
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20: @ loop line 2 @
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ldrb r2, [r4], #1 @ r7 = Y' = *Y'_p++
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ldrsb r8, [r1], #1 @ reload saved chromas
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ldrsb r9, [r1], #1 @
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ldrsb r10, [r1], #1 @
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@
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sub r2, r2, #16 @ r2 = Y = (Y' - 16)*74
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mul r7, r2, r14 @
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@ compute R, G, and B
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add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
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add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
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add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
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@
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orr r12, r2, r11 @ check if clamping is needed...
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orr r12, r12, r7, asr #1 @ ...at all
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cmp r12, #31 @
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bls 25f @ no clamp @
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mov r12, #31 @
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cmp r12, r2 @ clamp b
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andlo r2, r12, r2, asr #31 @
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eorlo r2, r2, r12 @
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cmp r12, r11 @ clamp r
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andlo r11, r12, r11, asr #31 @
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eorlo r11, r11, r12 @
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cmp r12, r7, asr #1 @ clamp g
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andlo r7, r12, r7, asr #31 @
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eorlo r7, r7, r12 @
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orrlo r7, r7, r7, asl #1 @
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25: @ no clamp @
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@
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orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
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ldrb r2, [r4], #1 @ r2 = Y' = *Y'_p++
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orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
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strh r12, [r0], #240 @ store pixel
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@
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@ do second pixel
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@
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sub r2, r2, #16 @ r2 = Y = (Y' - 16)*74
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mul r7, r2, r14 @
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@ compute R, G, and B
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add r2, r8, r7, asr #9 @ r2 = b = (Y >> 9) + bu
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add r11, r9, r7, asr #9 @ r11 = r = (Y >> 9) + rv
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add r7, r10, r7, asr #8 @ r7 = g = (Y >> 8) + guv
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@
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orr r12, r2, r11 @ check if clamping is needed...
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orr r12, r12, r7, asr #1 @ ...at all
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cmp r12, #31 @
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bls 25f @ no clamp @
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mov r12, #31 @
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cmp r12, r2 @ clamp b
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andlo r2, r12, r2, asr #31 @
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eorlo r2, r2, r12 @
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cmp r12, r11 @ clamp r
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andlo r11, r12, r11, asr #31 @
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eorlo r11, r11, r12 @
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cmp r12, r7, asr #1 @ clamp g
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andlo r7, r12, r7, asr #31 @
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eorlo r7, r7, r12 @
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orrlo r7, r7, r7, asl #1 @
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25: @ no clamp @
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@
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orr r12, r2, r11, lsl #11 @ r4 = b | (r << 11)
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orr r12, r12, r7, lsl #5 @ r4 |= (g << 5)
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strh r12, [r0, #240]! @ store pixel
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add r0, r0, #2*240 @
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@
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subs r3, r3, #2 @
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bgt 20b @ loop line 2 @
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@
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ldmia sp!, { r4-r12, pc } @ restore registers and return
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.size lcd_write_yuv420_lines, .-lcd_write_yuv420_lines
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