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/*
* (C) Gražvydas "notaz" Ignotas, 2010
*
* This work is licensed under the terms of any of these licenses
* (at your option):
* - GNU GPL, version 2 or later.
* - GNU LGPL, version 2.1 or later.
* See the COPYING file in the top-level directory.
*/
.text
.align 2
.global bgr555_to_rgb565
bgr555_to_rgb565:
pld [r1]
mov r3, #0x07c0
vdup.16 q15, r3
subs r2, r2, #64
blt btr16_end64
0:
pld [r1, #64*2]
vldmia r1!, {q0-q3}
vshl.u16 q4, q0, #11
vshl.u16 q5, q1, #11
vshl.u16 q6, q2, #11
vshl.u16 q7, q3, #11
vsri.u16 q4, q0, #10
vsri.u16 q5, q1, #10
vsri.u16 q6, q2, #10
vsri.u16 q7, q3, #10
vshl.u16 q0, q0, #1
vshl.u16 q1, q1, #1
vshl.u16 q2, q2, #1
vshl.u16 q3, q3, #1
vbit q4, q0, q15
vbit q5, q1, q15
vbit q6, q2, q15
vbit q7, q3, q15
vstmia r0!, {q4-q7}
subs r2, r2, #64
bge 0b
btr16_end64:
adds r2, r2, #64
bxeq lr
subs r2, r2, #16
blt btr16_end16
@ handle the remainder (reasonably rare)
0:
vld1.16 {q0}, [r1]!
vshl.u16 q1, q0, #11
vshl.u16 q2, q0, #1
vsri.u16 q1, q0, #10
vbit q1, q2, q15
subs r2, r2, #16
vst1.16 {q1}, [r0]!
bge 0b
btr16_end16:
adds r2, r2, #16
bxeq lr
subs r2, r2, #8
bxlt lr
@ very rare
vld1.16 d0, [r1]!
vshl.u16 d1, d0, #11
vshl.u16 d2, d0, #1
vsri.u16 d1, d0, #10
vbit d1, d2, d30
vst1.16 d1, [r0]!
bx lr
.global bgr888_to_rgb888
bgr888_to_rgb888:
pld [r1]
@ r2 /= 48
mov r2, r2, lsr #4
movw r3, #0x5556
movt r3, #0x5555
umull r12,r2, r3, r2
0:
pld [r1, #48*3]
vld3.8 {d0-d2}, [r1, :64]!
vld3.8 {d3-d5}, [r1, :64]!
vswp d0, d2
vswp d3, d5
vst3.8 {d0-d2}, [r0, :64]!
vst3.8 {d3-d5}, [r0, :64]!
subs r2, r2, #1
bne 0b
bx lr
.global bgr888_to_rgb565
bgr888_to_rgb565:
pld [r1]
@ r2 /= 48
mov r2, r2, lsr #4
movw r3, #0x5556
movt r3, #0x5555
umull r12,r2, r3, r2
mov r3, #0x07e0
vdup.16 q15, r3
0:
pld [r1, #48*3]
vld3.8 {d1-d3}, [r1, :64]!
vld3.8 {d5-d7}, [r1, :64]!
vshll.u8 q8, d2, #3 @ g
vshll.u8 q9, d6, #3
vshr.u8 d0, d3, #3 @ b
vshr.u8 d4, d7, #3
vzip.8 d0, d1 @ rb
vzip.8 d4, d5
vbit q0, q8, q15
vbit q2, q9, q15
vstmia r0!, {d0,d1}
vstmia r0!, {d4,d5}
subs r2, r2, #1
bne 0b
bx lr
@ vim:filetype=armasm
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