ef8a7eaf2a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15397 a1c6a512-1295-4272-9138-f99709370657
265 lines
10 KiB
ArmAsm
265 lines
10 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) 2007 by Andree Buschmann
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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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.section .icode, "ax", %progbits
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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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/* r0 = addr, must be aligned */
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lcd_write_data: /* r1 = pixel count, must be even */
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stmfd sp!, {r4-r6}
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mov r2, #0x30000000 /* LCD data port */
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subs r1, r1, #16
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.loop16:
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ldmgeia r0!, {r3-r6}
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stmgeia r2, {r3-r6}
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ldmgeia r0!, {r3-r6}
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stmgeia r2, {r3-r6}
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subges r1, r1, #16
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bge .loop16
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/* no need to correct the count, we're just checking bits from now */
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tst r1, #8
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ldmneia r0!, {r3-r6}
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stmneia r2, {r3-r6}
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tst r1, #4
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ldmneia r0!, {r3-r4}
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stmneia r2, {r3-r4}
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tst r1, #2
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ldrne r3, [r0], #4
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strne r3, [r2]
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ldmfd sp!, {r4-r6}
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bx lr
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/****************************************************************************
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* void lcd_write_yuv_420_upper(unsigned char const * const src[3],
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* unsigned char *croma_buf, int width);
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*
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* void lcd_write_yuv_420_lower(unsigned char *y_src,
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* unsigned char *croma_buf, int width);
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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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.align 2
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.global lcd_write_yuv420_upper
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.type lcd_write_yuv420_upper, %function
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lcd_write_yuv420_upper:
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/* r0 = yuv_src */
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/* r1 = chroma buffer */
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/* r2 = width */
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stmfd sp!, { r4-r12 } /* save non-scratch */
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ldmia r0, { r10, r11, r12 } /* r10 = yuv_src[0] = Y'_p */
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/* r11 = yuv_src[1] = Cb_p */
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/* r12 = yuv_src[2] = Cr_p */
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mov r7, r2 /* r7 = loop count */
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mov r8, r1 /* chroma buffer */
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mov r9, #0x30000000 /* LCD data port */
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/* 1st loop start */
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10: /* loop start */
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ldrb r0, [r11], #1 /* r0 = *usrc++ = *Cb_p++ */
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ldrb r1, [r12], #1 /* r1 = *vsrc++ = *Cr_p++ */
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sub r0, r0, #128 /* r0 = Cb-128 */
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sub r1, r1, #128 /* r1 = Cr-128 */
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add r3, r1, r1, asl #1 /* r3 = Cr*51 + Cb*24 */
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add r3, r3, r3, asl #4
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add r3, r3, r0, asl #3
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add r3, r3, r0, asl #4
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add r4, r1, r1, asl #2 /* r1 = Cr*101 */
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add r4, r4, r1, asl #5
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add r1, r4, r1, asl #6
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add r1, r1, #256 /* r1 = rv = (r1 + 256) >> 9 */
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mov r1, r1, asr #9
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strb r1, [r8], #1 /* store r1 to chroma_buf */
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rsb r3, r3, #128 /* r3 = guv = (-r3 + 128) >> 8 */
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mov r3, r3, asr #8
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strb r3, [r8], #1 /* store r3 to chroma_buf */
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add r0, r0, #2 /* r0 = bu = (Cb*128 + 256) >> 9 */
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mov r0, r0, asr #2
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strb r0, [r8], #1 /* store r0 to chroma_buf */
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/* 1st loop, first pixel */
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ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */
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sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
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add r2, r5, r5, asl #2
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add r5, r2, r5, asl #5
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add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */
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add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
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orr r5, r6, r4 /* check if clamping is needed... */
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orr r5, r5, r2, asr #1 /* ...at all */
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cmp r5, #31
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bls 15f /* -> no clamp */
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cmp r6, #31 /* clamp r */
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mvnhi r6, r6, asr #31
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andhi r6, r6, #31
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cmp r2, #63 /* clamp g */
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mvnhi r2, r2, asr #31
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andhi r2, r2, #63
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cmp r4, #31 /* clamp b */
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mvnhi r4, r4, asr #31
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andhi r4, r4, #31
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15: /* no clamp */
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orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */
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orr r4, r4, r6, lsl #11
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strh r4, [r9] /* write pixel */
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/* 1st loop, second pixel */
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ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */
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sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
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add r2, r5, r5, asl #2
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add r5, r2, r5, asl #5
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add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */
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add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
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orr r5, r6, r4 /* check if clamping is needed... */
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orr r5, r5, r2, asr #1 /* ...at all */
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cmp r5, #31
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bls 15f /* -> no clamp */
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cmp r6, #31 /* clamp r */
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mvnhi r6, r6, asr #31
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andhi r6, r6, #31
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cmp r2, #63 /* clamp g */
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mvnhi r2, r2, asr #31
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andhi r2, r2, #63
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cmp r4, #31 /* clamp b */
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mvnhi r4, r4, asr #31
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andhi r4, r4, #31
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15: /* no clamp */
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orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */
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orr r4, r4, r6, lsl #11
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strh r4, [r9] /* write pixel */
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subs r7, r7, #2 /* check for loop end */
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bgt 10b /* back to beginning */
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ldmfd sp!, { r4-r12 } /* restore registers */
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bx lr
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.ltorg
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.size lcd_write_yuv420_upper, .-lcd_write_yuv420_upper
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.align 2
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.global lcd_write_yuv420_lower
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.type lcd_write_yuv420_lower, %function
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lcd_write_yuv420_lower:
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/* r0 = y_src */
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/* r1 = croma buf */
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/* r2 = width */
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stmfd sp!, { r4-r10 } /* save non-scratch */
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mov r10, r0 /* r10 = y_src */
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mov r7, r2 /* r7 = loop count */
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mov r8, r1 /* chroma buffer */
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mov r9, #0x30000000 /* LCD data port */
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20: /* loop start */
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/* restore r1, r3 and r0 from chroma buffer */
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ldrsb r1, [r8], #1
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ldrsb r3, [r8], #1
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ldrsb r0, [r8], #1
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/* 2nd loop, first pixel */
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ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */
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sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
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add r2, r5, r5, asl #2
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add r5, r2, r5, asl #5
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add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */
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add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
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orr r5, r6, r4 /* check if clamping is needed... */
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orr r5, r5, r2, asr #1 /* ...at all */
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cmp r5, #31
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bls 15f /* -> no clamp */
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cmp r6, #31 /* clamp r */
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mvnhi r6, r6, asr #31
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andhi r6, r6, #31
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cmp r2, #63 /* clamp g */
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mvnhi r2, r2, asr #31
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andhi r2, r2, #63
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cmp r4, #31 /* clamp b */
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mvnhi r4, r4, asr #31
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andhi r4, r4, #31
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15: /* no clamp */
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orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */
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orr r4, r4, r6, lsl #11
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strh r4, [r9] /* write pixel */
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/* 2nd loop, second pixel */
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ldrb r5, [r10], #1 /* r5 = *ysrc++ = *Y'_p++ */
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sub r5, r5, #16 /* r5 = (Y'-16) * 74 */
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add r2, r5, r5, asl #2
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add r5, r2, r5, asl #5
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add r6, r1, r5, asr #8 /* r6 = r = (Y >> 9) + rv */
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add r2, r3, r5, asr #7 /* r2 = g = (Y >> 8) + guv */
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add r4, r0, r5, asr #8 /* r4 = b = (Y >> 9) + bu */
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orr r5, r6, r4 /* check if clamping is needed... */
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orr r5, r5, r2, asr #1 /* ...at all */
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cmp r5, #31
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bls 15f /* -> no clamp */
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cmp r6, #31 /* clamp r */
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mvnhi r6, r6, asr #31
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andhi r6, r6, #31
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cmp r2, #63 /* clamp g */
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mvnhi r2, r2, asr #31
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andhi r2, r2, #63
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cmp r4, #31 /* clamp b */
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mvnhi r4, r4, asr #31
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andhi r4, r4, #31
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15: /* no clamp */
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orr r4, r4, r2, lsl #5 /* pixel = r<<11 | g<<5 | b */
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orr r4, r4, r6, lsl #11
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strh r4, [r9] /* write pixel */
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subs r7, r7, #2 /* check for loop end */
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bgt 20b /* back to beginning */
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/* 2nd loop end */
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ldmfd sp!, { r4-r10 } /* restore registers */
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bx lr
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.ltorg
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.size lcd_write_yuv420_lower, .-lcd_write_yuv420_lower
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