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/*
* void add_bitmaps( uint8_t *dst, intptr_t dst_stride,
* uint8_t *src, intptr_t src_stride,
* intptr_t width, intptr_t height );
*/
#include "asm.S"
.macro blend_func type
function \type\()_bitmaps_arm
push {r4-r7}
ldrd r4, r5, [sp, #16]
@.Lskip_prologue:
mla r5, r5, r3, r2
0: @ height loop
mov r6, #0 @ x offset
1: @ stride loop
ldr r7, [r0, r6]
ldr ip, [r2, r6]
uq\type\()8 ip, r7, ip
str ip, [r0, r6]
add r6, #4
cmp r6, r4
blo 1b @ still in scan line
add r0, r1
add r2, r3
cmp r2, r5
blo 0b
pop {r4-r7}
bx lr
endfunc
.endm
blend_func add
blend_func sub
/*
* void mul_bitmaps( uint8_t *dst, intptr_t dst_stride,
* uint8_t *src1, intptr_t src1_stride,
* uint8_t *src2, intptr_t src2_stride,
* intptr_t width, intptr_t height );
*/
function mul_bitmaps_arm
mov r11, #255
push {r4-r11}
ldrd r4, r5, [sp, #32]
ldrd r6, r7, [sp, #40]
mla r7, r7, r3, r2 @ last address
0: @ height loop
mov r8, #0 @ x offset
1: @ stride loop
ldrb r9, [r2, r8]
ldrb r10, [r4, r8]
mla r9, r9, r10, r11
asr r9, r9, #8
strb r9, [r0, r8]
add r8, r8, #1
cmp r8, r6
blo 1b @ still in scan line
add r0, r1
add r2, r3
add r4, r5
cmp r2, r7
blo 0b
pop {r4-r11}
bx lr
endfunc
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