| 1 | /* |
| 2 | * (C) GraÅžvydas "notaz" Ignotas, 2010 |
| 3 | * |
| 4 | * This work is licensed under the terms of any of these licenses |
| 5 | * (at your option): |
| 6 | * - GNU GPL, version 2 or later. |
| 7 | * - GNU LGPL, version 2.1 or later. |
| 8 | * See the COPYING file in the top-level directory. |
| 9 | */ |
| 10 | |
| 11 | .text |
| 12 | .align 2 |
| 13 | |
| 14 | .global bgr555_to_rgb565 |
| 15 | bgr555_to_rgb565: |
| 16 | mov r3, #0x07c0 |
| 17 | vdup.16 q15, r3 |
| 18 | subs r2, r2, #64 |
| 19 | blt btr16_end64 |
| 20 | 0: |
| 21 | vldmia r1!, {q0-q3} |
| 22 | vshl.u16 q4, q0, #11 |
| 23 | vshl.u16 q5, q1, #11 |
| 24 | vshl.u16 q6, q2, #11 |
| 25 | vshl.u16 q7, q3, #11 |
| 26 | vsri.u16 q4, q0, #10 |
| 27 | vsri.u16 q5, q1, #10 |
| 28 | vsri.u16 q6, q2, #10 |
| 29 | vsri.u16 q7, q3, #10 |
| 30 | vshl.u16 q0, q0, #1 |
| 31 | vshl.u16 q1, q1, #1 |
| 32 | vshl.u16 q2, q2, #1 |
| 33 | vshl.u16 q3, q3, #1 |
| 34 | vbit q4, q0, q15 |
| 35 | vbit q5, q1, q15 |
| 36 | vbit q6, q2, q15 |
| 37 | vbit q7, q3, q15 |
| 38 | vstmia r0!, {q4-q7} |
| 39 | subs r2, r2, #64 |
| 40 | bge 0b |
| 41 | |
| 42 | btr16_end64: |
| 43 | adds r2, r2, #64 |
| 44 | bxeq lr |
| 45 | subs r2, r2, #16 |
| 46 | blt btr16_end16 |
| 47 | |
| 48 | @ handle the remainder (reasonably rare) |
| 49 | 0: |
| 50 | vld1.16 {q0}, [r1]! |
| 51 | vshl.u16 q1, q0, #11 |
| 52 | vshl.u16 q2, q0, #1 |
| 53 | vsri.u16 q1, q0, #10 |
| 54 | vbit q1, q2, q15 |
| 55 | subs r2, r2, #16 |
| 56 | vst1.16 {q1}, [r0]! |
| 57 | bge 0b |
| 58 | |
| 59 | btr16_end16: |
| 60 | adds r2, r2, #16 |
| 61 | bxeq lr |
| 62 | subs r2, r2, #8 |
| 63 | bxlt lr |
| 64 | |
| 65 | @ very rare |
| 66 | vld1.16 d0, [r1]! |
| 67 | vshl.u16 d1, d0, #11 |
| 68 | vshl.u16 d2, d0, #1 |
| 69 | vsri.u16 d1, d0, #10 |
| 70 | vbit d1, d2, d30 |
| 71 | vst1.16 d1, [r0]! |
| 72 | bx lr |
| 73 | |
| 74 | |
| 75 | .global bgr888_to_rgb888 |
| 76 | bgr888_to_rgb888: |
| 77 | @ r2 /= 48 |
| 78 | mov r2, r2, lsr #4 |
| 79 | movw r3, #0x5556 |
| 80 | movt r3, #0x5555 |
| 81 | umull r12,r2, r3, r2 |
| 82 | 0: |
| 83 | vld3.8 {d0-d2}, [r1, :64]! |
| 84 | vld3.8 {d3-d5}, [r1, :64]! |
| 85 | vswp d0, d2 |
| 86 | vswp d3, d5 |
| 87 | vst3.8 {d0-d2}, [r0, :64]! |
| 88 | vst3.8 {d3-d5}, [r0, :64]! |
| 89 | subs r2, r2, #1 |
| 90 | bne 0b |
| 91 | |
| 92 | bx lr |
| 93 | |
| 94 | |
| 95 | .global bgr888_to_rgb565 |
| 96 | bgr888_to_rgb565: |
| 97 | @ r2 /= 48 |
| 98 | mov r2, r2, lsr #4 |
| 99 | movw r3, #0x5556 |
| 100 | movt r3, #0x5555 |
| 101 | umull r12,r2, r3, r2 |
| 102 | |
| 103 | mov r3, #0x07e0 |
| 104 | vdup.16 q15, r3 |
| 105 | 0: |
| 106 | vld3.8 {d1-d3}, [r1, :64]! |
| 107 | vld3.8 {d5-d7}, [r1, :64]! |
| 108 | |
| 109 | vshll.u8 q8, d2, #3 @ g |
| 110 | vshll.u8 q9, d6, #3 |
| 111 | vshr.u8 d0, d3, #3 @ b |
| 112 | vshr.u8 d4, d7, #3 |
| 113 | vzip.8 d0, d1 @ rb |
| 114 | vzip.8 d4, d5 |
| 115 | vbit q0, q8, q15 |
| 116 | vbit q2, q9, q15 |
| 117 | |
| 118 | vstmia r0!, {d0,d1} |
| 119 | vstmia r0!, {d4,d5} |
| 120 | subs r2, r2, #1 |
| 121 | bne 0b |
| 122 | |
| 123 | bx lr |
| 124 | |
| 125 | |
| 126 | @ vim:filetype=armasm |