static inline void dxt1_decode_pixels(const uint8_t *s, uint32_t *d, unsigned int qstride, unsigned int flag, uint64_t alpha) { unsigned int x, y, c0, c1, a = (!flag * 255u) << 24; unsigned int rb0, rb1, rb2, rb3, g0, g1, g2, g3; uint32_t colors[4], pixels; c0 = AV_RL16(s); c1 = AV_RL16(s+2); rb0 = (c0<<3 | c0<<8) & 0xf800f8; rb1 = (c1<<3 | c1<<8) & 0xf800f8; rb0 += (rb0>>5) & 0x070007; rb1 += (rb1>>5) & 0x070007; g0 = (c0 <<5) & 0x00fc00; g1 = (c1 <<5) & 0x00fc00; g0 += (g0 >>6) & 0x000300; g1 += (g1 >>6) & 0x000300; colors[0] = rb0 + g0 + a; colors[1] = rb1 + g1 + a; if (c0 > c1 || flag) { rb2 = (((2*rb0+rb1) * 21) >> 6) & 0xff00ff; rb3 = (((2*rb1+rb0) * 21) >> 6) & 0xff00ff; g2 = (((2*g0 +g1 ) * 21) >> 6) & 0x00ff00; g3 = (((2*g1 +g0 ) * 21) >> 6) & 0x00ff00; colors[3] = rb3 + g3 + a; } else { rb2 = ((rb0+rb1) >> 1) & 0xff00ff; g2 = ((g0 +g1 ) >> 1) & 0x00ff00; colors[3] = 0; } colors[2] = rb2 + g2 + a; pixels = AV_RL32(s+4); for (y=0; y<4; y++) { for (x=0; x<4; x++) { a = (alpha & 0x0f) << 28; a += a >> 4; d[x] = a + colors[pixels&3]; pixels >>= 2; alpha >>= 4; } d += qstride; } }