diff options
Diffstat (limited to 'frontend')
| -rw-r--r-- | frontend/arm_utils.h | 3 | ||||
| -rw-r--r-- | frontend/arm_utils.s | 31 |
2 files changed, 34 insertions, 0 deletions
diff --git a/frontend/arm_utils.h b/frontend/arm_utils.h new file mode 100644 index 0000000..f7d637e --- /dev/null +++ b/frontend/arm_utils.h @@ -0,0 +1,3 @@ +void bgr555_to_rgb565(void *dst, void *src, int bytes); +void bgr888_to_rgb888(void *dst, void *src, int bytes); +void bgr888_to_rgb565(void *dst, void *src, int bytes); diff --git a/frontend/arm_utils.s b/frontend/arm_utils.s index 4736380..4e561f9 100644 --- a/frontend/arm_utils.s +++ b/frontend/arm_utils.s @@ -75,4 +75,35 @@ bgr888_to_rgb888: bx lr +.global bgr888_to_rgb565 +bgr888_to_rgb565: + @ 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: + 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 |