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1 | /* |
2 | * (C) GraÅžvydas "notaz" Ignotas, 2010 |
3 | * |
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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. |
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8 | * See the COPYING file in the top-level directory. |
9 | */ |
10 | |
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11 | #include "arm_features.h" |
12 | |
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13 | .text |
14 | .align 2 |
15 | |
16 | .global bgr555_to_rgb565 |
17 | bgr555_to_rgb565: |
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18 | pld [r1] |
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19 | mov r3, #0x07c0 |
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20 | vdup.16 q15, r3 |
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21 | subs r2, r2, #64 |
22 | blt btr16_end64 |
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23 | 0: |
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24 | pld [r1, #64*2] |
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25 | vldmia r1!, {q0-q3} |
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26 | vshl.u16 q4, q0, #11 |
27 | vshl.u16 q5, q1, #11 |
28 | vshl.u16 q6, q2, #11 |
29 | vshl.u16 q7, q3, #11 |
30 | vsri.u16 q4, q0, #10 |
31 | vsri.u16 q5, q1, #10 |
32 | vsri.u16 q6, q2, #10 |
33 | vsri.u16 q7, q3, #10 |
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34 | vshl.u16 q0, q0, #1 |
35 | vshl.u16 q1, q1, #1 |
36 | vshl.u16 q2, q2, #1 |
37 | vshl.u16 q3, q3, #1 |
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38 | vbit q4, q0, q15 |
39 | vbit q5, q1, q15 |
40 | vbit q6, q2, q15 |
41 | vbit q7, q3, q15 |
42 | vstmia r0!, {q4-q7} |
43 | subs r2, r2, #64 |
44 | bge 0b |
45 | |
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46 | btr16_end64: |
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47 | adds r2, r2, #64 |
48 | bxeq lr |
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49 | subs r2, r2, #16 |
50 | blt btr16_end16 |
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51 | |
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52 | @ handle the remainder (reasonably rare) |
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53 | 0: |
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54 | vld1.16 {q0}, [r1]! |
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55 | vshl.u16 q1, q0, #11 |
56 | vshl.u16 q2, q0, #1 |
57 | vsri.u16 q1, q0, #10 |
58 | vbit q1, q2, q15 |
59 | subs r2, r2, #16 |
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60 | vst1.16 {q1}, [r0]! |
61 | bge 0b |
62 | |
63 | btr16_end16: |
64 | adds r2, r2, #16 |
65 | bxeq lr |
66 | subs r2, r2, #8 |
67 | bxlt lr |
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68 | |
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69 | @ very rare |
70 | vld1.16 d0, [r1]! |
71 | vshl.u16 d1, d0, #11 |
72 | vshl.u16 d2, d0, #1 |
73 | vsri.u16 d1, d0, #10 |
74 | vbit d1, d2, d30 |
75 | vst1.16 d1, [r0]! |
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76 | bx lr |
77 | |
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78 | |
79 | .global bgr888_to_rgb888 |
80 | bgr888_to_rgb888: |
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81 | pld [r1] |
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82 | @ r2 /= 48 |
83 | mov r2, r2, lsr #4 |
84 | movw r3, #0x5556 |
85 | movt r3, #0x5555 |
86 | umull r12,r2, r3, r2 |
87 | 0: |
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88 | pld [r1, #48*3] |
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89 | vld3.8 {d0-d2}, [r1, :64]! |
90 | vld3.8 {d3-d5}, [r1, :64]! |
91 | vswp d0, d2 |
92 | vswp d3, d5 |
93 | vst3.8 {d0-d2}, [r0, :64]! |
94 | vst3.8 {d3-d5}, [r0, :64]! |
95 | subs r2, r2, #1 |
96 | bne 0b |
97 | |
98 | bx lr |
99 | |
100 | |
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101 | .global bgr888_to_rgb565 |
102 | bgr888_to_rgb565: |
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103 | pld [r1] |
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104 | @ r2 /= 48 |
105 | mov r2, r2, lsr #4 |
106 | movw r3, #0x5556 |
107 | movt r3, #0x5555 |
108 | umull r12,r2, r3, r2 |
109 | |
110 | mov r3, #0x07e0 |
111 | vdup.16 q15, r3 |
112 | 0: |
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113 | pld [r1, #48*3] |
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114 | vld3.8 {d1-d3}, [r1, :64]! |
115 | vld3.8 {d5-d7}, [r1, :64]! |
116 | |
117 | vshll.u8 q8, d2, #3 @ g |
118 | vshll.u8 q9, d6, #3 |
119 | vshr.u8 d0, d3, #3 @ b |
120 | vshr.u8 d4, d7, #3 |
121 | vzip.8 d0, d1 @ rb |
122 | vzip.8 d4, d5 |
123 | vbit q0, q8, q15 |
124 | vbit q2, q9, q15 |
125 | |
126 | vstmia r0!, {d0,d1} |
127 | vstmia r0!, {d4,d5} |
128 | subs r2, r2, #1 |
129 | bne 0b |
130 | |
131 | bx lr |
132 | |
133 | |
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134 | .global rgb888_to_rgb565 |
135 | rgb888_to_rgb565: |
136 | pld [r1] |
137 | @ r2 /= 48 |
138 | mov r2, r2, lsr #4 |
139 | movw r3, #0x5556 |
140 | movt r3, #0x5555 |
141 | umull r12,r2, r3, r2 |
142 | |
143 | mov r3, #0x07e0 |
144 | vdup.16 q15, r3 |
145 | 0: |
146 | pld [r1, #48*3] |
147 | vld3.8 {d1-d3}, [r1, :64]! |
148 | vld3.8 {d5-d7}, [r1, :64]! |
149 | |
150 | vshll.u8 q8, d2, #3 @ g |
151 | vshll.u8 q9, d6, #3 |
152 | vshr.u8 d2, d1, #3 @ b |
153 | vshr.u8 d6, d5, #3 |
154 | vzip.8 d2, d3 @ rb |
155 | vzip.8 d6, d7 |
156 | vbit q1, q8, q15 |
157 | vbit q3, q9, q15 |
158 | |
159 | vstmia r0!, {d2,d3} |
160 | vstmia r0!, {d6,d7} |
161 | subs r2, r2, #1 |
162 | bne 0b |
163 | |
164 | bx lr |
165 | |
166 | |
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167 | @ vim:filetype=armasm |