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/*
* (C) Gražvydas "notaz" Ignotas, 2013
*
* This work is licensed under the terms of GNU GPL version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "arm_features.h"
.text
.align 2
@ lr=0x001f001f
@ trashes r11, r12
.macro bgr555_to_rgb565_one rn
and r11, lr, \rn
and r12, lr, \rn, lsr #5
and \rn, lr, \rn, lsr #10
orr r12, r11, lsl #5
orr \rn, r12, lsl #6
.endm
.macro pld_ reg offs=#0
#ifdef HAVE_ARMV6
pld [\reg, \offs]
#endif
.endm
FUNCTION(bgr555_to_rgb565): @ void *dst, const void *src, int bytes
pld_ r1
push {r4-r11,lr}
mov lr, #0x001f
subs r2, #4*8
orr lr, lr, lsl #16
blt 1f
0:
ldmia r1!, {r3-r10}
subs r2, #4*8
bgr555_to_rgb565_one r3
pld_ r1, #32*2
bgr555_to_rgb565_one r4
bgr555_to_rgb565_one r5
bgr555_to_rgb565_one r6
bgr555_to_rgb565_one r7
bgr555_to_rgb565_one r8
bgr555_to_rgb565_one r9
bgr555_to_rgb565_one r10
stmia r0!, {r3-r10}
bge 0b
1:
adds r2, #4*8
popeq {r4-r11,pc}
2:
ldr r3, [r1], #4
subs r2, #4
bgr555_to_rgb565_one r3
str r3, [r0], #4
bgt 2b
pop {r4-r11,pc}
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