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| author | Szymon Dziok <b0hoon@o2.pl> | 2010-12-13 23:51:48 +0000 |
|---|---|---|
| committer | Szymon Dziok <b0hoon@o2.pl> | 2010-12-13 23:51:48 +0000 |
| commit | 703db94de695c5efc047bbfe8e709550888b9136 (patch) | |
| tree | 8d080a45d39e07c440eaa238fe09edc083240d0c | |
| parent | c43fb3cf1b74588b150d033a7edba091d2f22dc0 (diff) | |
| download | rockbox-703db94de695c5efc047bbfe8e709550888b9136.tar.gz rockbox-703db94de695c5efc047bbfe8e709550888b9136.zip | |
HDD6330: speedup lcd_blit_yuv() function (~4%).
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28828 a1c6a512-1295-4272-9138-f99709370657
| -rw-r--r-- | firmware/target/arm/philips/hdd6330/lcd-as-hdd6330.S | 61 |
1 files changed, 26 insertions, 35 deletions
diff --git a/firmware/target/arm/philips/hdd6330/lcd-as-hdd6330.S b/firmware/target/arm/philips/hdd6330/lcd-as-hdd6330.S index 364eb5b08f..c3a7992a2e 100644 --- a/firmware/target/arm/philips/hdd6330/lcd-as-hdd6330.S +++ b/firmware/target/arm/philips/hdd6330/lcd-as-hdd6330.S @@ -48,38 +48,34 @@ lcd_yuv_write_inner_loop: ldrb r7, [r1], #1 @ *usrc++ ldrb r8, [r2], #1 @ *vsrc++ - add r10, r8, r8, asl #2 @ 101* vsrc + sub r7, r7, #128 @ Cb -= 128 + sub r8, r8, #128 @ Cr -= 128 + + add r10, r8, r8, asl #2 @ Cr*101 add r10, r10, r8, asl #5 add r10, r10, r8, asl #6 - sub r10, r10, #0x3600 - sub r10, r10, #0x0020 @ -13856 (ROUNDOFFSR) - add r11, r8, r8, asl #1 @ 51*vsrc + 24*usrc + add r11, r8, r8, asl #1 @ Cr*51 + Cb*24 add r11, r11, r11, asl #4 add r11, r11, r7, asl #3 add r11, r11, r7, asl #4 - mov r12, #0x2100 - add r12, r12, #0x60 @ +8544 (ROUNDOFFSG) - r11 - rsb r11, r11, r12 - mov r12, r7, asl #7 @ 128 * usrc - sub r12, r12, #0x4300 - sub r12, r12, #0x00a0 @ -17312 (ROUNDOFFSB) + add r12, r7, #2 @ r12 = bu = (Cb*128 + 256) >> 9 + mov r12, r12, asr #2 + add r10, r10, #256 @ r10 = rv = (Cr*101 + 256) >> 9 + mov r10, r10, asr #9 + rsb r11, r11, #128 @ r11 = guv = (-r11 + 128) >> 8 + mov r11, r11, asr #8 @ pixel_1 - ldrb r8, [r0], #1 @ *ysrc++ - mov r7, r8, asl #1 - add r7, r7, r8, asl #3 - add r7, r7, r8, asl #6 @ ysrc * 74 - - add r9, r10, r7 - mov r9, r9, asr #9 @ R - - add r8, r11, r7 - mov r8, r8, asr #8 @ G + ldrb r7, [r0], #1 @ *ysrc++ + sub r7, r7, #16 @ Y = (Y' - 16) * 37 + add r8, r7, r7, asl #2 + add r7, r8, r7, asl #5 - add r7, r12, r7 - mov r7, r7, asr #9 @ B + add r9, r10, r7, asr #8 @ R = (Y >> 8) + rv + add r8, r11, r7, asr #7 @ G = (Y >> 7) + guv + add r7, r12, r7, asr #8 @ B = (Y >> 8) + bu cmp r9, #31 @ clamp R mvnhi r9, r9, asr #31 @@ -101,19 +97,14 @@ lcd_yuv_write_inner_loop: add r6, r7, r6, lsr #8 @ pixel_2 - ldrb r8, [r0], #1 @ *ysrc++ - mov r7, r8, asl #1 - add r7, r7, r8, asl #3 - add r7, r7, r8, asl #6 @ ysrc * 74 - - add r9, r10, r7 - mov r9, r9, asr #9 @ R - - add r8, r11, r7 - mov r8, r8, asr #8 @ G - - add r7, r12, r7 - mov r7, r7, asr #9 @ B + ldrb r7, [r0], #1 @ *ysrc++ + sub r7, r7, #16 @ Y = (Y' - 16) * 37 + add r8, r7, r7, asl #2 + add r7, r8, r7, asl #5 + + add r9, r10, r7, asr #8 @ R = (Y >> 8) + rv + add r8, r11, r7, asr #7 @ G = (Y >> 7) + guv + add r7, r12, r7, asr #8 @ B = (Y >> 8) + bu cmp r9, #31 @ clamp R mvnhi r9, r9, asr #31 |