2 * (C) GraÅžvydas "notaz" Ignotas, 2011,2012,2022
4 * This work is licensed under the terms of any of these licenses
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.
15 * note: these are intended for testing and should be avoided
16 * in favor of NEON version or platform-specific conversion
19 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
20 #define SWAP16(x) __builtin_bswap16(x)
21 #define LE16TOHx2(x) ((SWAP16((x) >> 16) << 16) | SWAP16(x))
23 #define LE16TOHx2(x) (x)
26 #if defined(HAVE_bgr555_to_rgb565)
28 /* have bgr555_to_rgb565 somewhere else */
30 #elif ((defined(__clang_major__) && __clang_major__ >= 4) \
31 || (defined(__GNUC__) && __GNUC__ >= 5)) \
32 && __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
36 #if defined(__ARM_NEON) || defined(__ARM_NEON__)
38 #define gsli(d_, s_, n_) d_ = vsliq_n_u16(d_, s_, n_)
39 #define gsri(d_, s_, n_) d_ = vsriq_n_u16(d_, s_, n_)
41 #define gsli(d_, s_, n_) d_ |= s_ << n_
42 #define gsri(d_, s_, n_) d_ |= s_ >> n_
45 typedef uint16_t gvu16 __attribute__((vector_size(16),aligned(16)));
46 typedef uint16_t gvu16u __attribute__((vector_size(16),aligned(2)));
47 #define gdup(v_) {v_, v_, v_, v_, v_, v_, v_, v_}
48 #define do_one(s) ({ \
49 uint16_t d_ = (s) << 1; d_ = (d_ & 0x07c0) | (d_ << 10) | (d_ >> 11); d_; \
51 #define do_one_simd(d_, s_, c0x07c0_) { \
58 void bgr555_to_rgb565(void * __restrict__ dst_, const void * __restrict__ src_, int bytes)
60 const uint16_t * __restrict__ src = src_;
61 uint16_t * __restrict__ dst = dst_;
62 gvu16 c0x07c0 = gdup(0x07c0);
64 assert(!(((uintptr_t)dst | (uintptr_t)src | bytes) & 1));
66 // align the destination
67 if ((uintptr_t)dst & 0x0e)
69 uintptr_t left = 0x10 - ((uintptr_t)dst & 0x0e);
70 gvu16 d, s = *(const gvu16u *)src;
71 do_one_simd(d, s, c0x07c0);
78 for (; bytes >= 16; dst += 8, src += 8, bytes -= 16)
80 gvu16 d, s = *(const gvu16u *)src;
81 do_one_simd(d, s, c0x07c0);
83 __builtin_prefetch(src + 128/2);
86 for (; bytes > 0; dst++, src++, bytes -= 2)
94 void bgr555_to_rgb565(void *dst_, const void *src_, int bytes)
96 // source can be misaligned, but it's very rare, so just force
97 const unsigned int *src = (const void *)((intptr_t)src_ & ~3);
98 unsigned int *dst = dst_;
99 unsigned int x, p, r, g, b;
101 for (x = 0; x < bytes / 4; x++) {
102 p = LE16TOHx2(src[x]);
104 r = (p & 0x001f001f) << 11;
105 g = (p & 0x03e003e0) << 1;
106 b = (p & 0x7c007c00) >> 10;
114 #ifndef HAVE_bgr888_to_x
116 void bgr888_to_rgb565(void *dst_, const void *src_, int bytes)
118 const unsigned char *src = src_;
119 unsigned int *dst = dst_;
120 unsigned int r1, g1, b1, r2, g2, b2;
122 for (; bytes >= 6; bytes -= 6, src += 6, dst++) {
129 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
130 *dst = (r1 << 24) | (g1 << 19) | (b1 << 13) |
131 (r2 << 8) | (g2 << 3) | (b2 >> 3);
133 *dst = (r2 << 24) | (g2 << 19) | (b2 << 13) |
134 (r1 << 8) | (g1 << 3) | (b1 >> 3);
140 void rgb888_to_rgb565(void *dst, const void *src, int bytes) {}
141 void bgr888_to_rgb888(void *dst, const void *src, int bytes) {}
143 #endif // __ARM_NEON__
146 static int yuv_ry[32], yuv_gy[32], yuv_by[32];
147 static unsigned char yuv_u[32 * 2], yuv_v[32 * 2];
149 void bgr_to_uyvy_init(void)
153 /* init yuv converter:
154 y0 = (int)((0.299f * r0) + (0.587f * g0) + (0.114f * b0));
155 y1 = (int)((0.299f * r1) + (0.587f * g1) + (0.114f * b1));
156 u = (int)(8 * 0.565f * (b0 - y0)) + 128;
157 v = (int)(8 * 0.713f * (r0 - y0)) + 128;
159 for (i = 0; i < 32; i++) {
160 yuv_ry[i] = (int)(0.299f * i * 65536.0f + 0.5f);
161 yuv_gy[i] = (int)(0.587f * i * 65536.0f + 0.5f);
162 yuv_by[i] = (int)(0.114f * i * 65536.0f + 0.5f);
164 for (i = -32; i < 32; i++) {
165 v = (int)(8 * 0.565f * i) + 128;
171 v = (int)(8 * 0.713f * i) + 128;
180 void rgb565_to_uyvy(void *d, const void *s, int pixels)
182 unsigned int *dst = d;
183 const unsigned short *src = s;
184 const unsigned char *yu = yuv_u + 32;
185 const unsigned char *yv = yuv_v + 32;
186 int r0, g0, b0, r1, g1, b1;
189 for (; pixels > 0; src += 2, dst++, pixels -= 2)
191 r0 = (src[0] >> 11) & 0x1f;
192 g0 = (src[0] >> 6) & 0x1f;
194 r1 = (src[1] >> 11) & 0x1f;
195 g1 = (src[1] >> 6) & 0x1f;
197 y0 = (yuv_ry[r0] + yuv_gy[g0] + yuv_by[b0]) >> 16;
198 y1 = (yuv_ry[r1] + yuv_gy[g1] + yuv_by[b1]) >> 16;
201 // valid Y range seems to be 16..235
202 y0 = 16 + 219 * y0 / 31;
203 y1 = 16 + 219 * y1 / 31;
205 *dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;
209 void bgr555_to_uyvy(void *d, const void *s, int pixels)
211 unsigned int *dst = d;
212 const unsigned short *src = s;
213 const unsigned char *yu = yuv_u + 32;
214 const unsigned char *yv = yuv_v + 32;
215 int r0, g0, b0, r1, g1, b1;
218 for (; pixels > 1; src += 2, dst++, pixels -= 2)
220 b0 = (src[0] >> 10) & 0x1f;
221 g0 = (src[0] >> 5) & 0x1f;
223 b1 = (src[1] >> 10) & 0x1f;
224 g1 = (src[1] >> 5) & 0x1f;
226 y0 = (yuv_ry[r0] + yuv_gy[g0] + yuv_by[b0]) >> 16;
227 y1 = (yuv_ry[r1] + yuv_gy[g1] + yuv_by[b1]) >> 16;
230 y0 = 16 + 219 * y0 / 31;
231 y1 = 16 + 219 * y1 / 31;
233 *dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;
237 void bgr888_to_uyvy(void *d, const void *s, int pixels)
239 unsigned int *dst = d;
240 const unsigned char *src8 = s;
241 const unsigned char *yu = yuv_u + 32;
242 const unsigned char *yv = yuv_v + 32;
243 int r0, g0, b0, r1, g1, b1;
246 for (; pixels > 0; src8 += 3*2, dst++, pixels -= 2)
248 r0 = src8[0], g0 = src8[1], b0 = src8[2];
249 r1 = src8[3], g1 = src8[4], b1 = src8[5];
250 y0 = (r0 * 19595 + g0 * 38470 + b0 * 7471) >> 16;
251 y1 = (r1 * 19595 + g1 * 38470 + b1 * 7471) >> 16;
252 u = yu[(b0 - y0) / 8];
253 v = yv[(r0 - y0) / 8];
254 y0 = 16 + 219 * y0 / 255;
255 y1 = 16 + 219 * y1 / 255;
257 *dst = (y1 << 24) | (v << 16) | (y0 << 8) | u;