1 // Copyright 2014 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // Utilities for processing transparent channel. 11 // 12 // Author(s): Branimir Vasic (branimir.vasic (at) imgtec.com) 13 // Djordje Pesut (djordje.pesut (at) imgtec.com) 14 15 #include "./dsp.h" 16 17 #if defined(WEBP_USE_MIPS_DSP_R2) 18 19 static int DispatchAlpha(const uint8_t* alpha, int alpha_stride, 20 int width, int height, 21 uint8_t* dst, int dst_stride) { 22 uint32_t alpha_mask = 0xffffffff; 23 int i, j, temp0; 24 25 for (j = 0; j < height; ++j) { 26 uint8_t* pdst = dst; 27 const uint8_t* palpha = alpha; 28 for (i = 0; i < (width >> 2); ++i) { 29 int temp1, temp2, temp3; 30 31 __asm__ volatile ( 32 "ulw %[temp0], 0(%[palpha]) \n\t" 33 "addiu %[palpha], %[palpha], 4 \n\t" 34 "addiu %[pdst], %[pdst], 16 \n\t" 35 "srl %[temp1], %[temp0], 8 \n\t" 36 "srl %[temp2], %[temp0], 16 \n\t" 37 "srl %[temp3], %[temp0], 24 \n\t" 38 "and %[alpha_mask], %[alpha_mask], %[temp0] \n\t" 39 "sb %[temp0], -16(%[pdst]) \n\t" 40 "sb %[temp1], -12(%[pdst]) \n\t" 41 "sb %[temp2], -8(%[pdst]) \n\t" 42 "sb %[temp3], -4(%[pdst]) \n\t" 43 : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2), 44 [temp3]"=&r"(temp3), [palpha]"+r"(palpha), [pdst]"+r"(pdst), 45 [alpha_mask]"+r"(alpha_mask) 46 : 47 : "memory" 48 ); 49 } 50 51 for (i = 0; i < (width & 3); ++i) { 52 __asm__ volatile ( 53 "lbu %[temp0], 0(%[palpha]) \n\t" 54 "addiu %[palpha], %[palpha], 1 \n\t" 55 "sb %[temp0], 0(%[pdst]) \n\t" 56 "and %[alpha_mask], %[alpha_mask], %[temp0] \n\t" 57 "addiu %[pdst], %[pdst], 4 \n\t" 58 : [temp0]"=&r"(temp0), [palpha]"+r"(palpha), [pdst]"+r"(pdst), 59 [alpha_mask]"+r"(alpha_mask) 60 : 61 : "memory" 62 ); 63 } 64 alpha += alpha_stride; 65 dst += dst_stride; 66 } 67 68 __asm__ volatile ( 69 "ext %[temp0], %[alpha_mask], 0, 16 \n\t" 70 "srl %[alpha_mask], %[alpha_mask], 16 \n\t" 71 "and %[alpha_mask], %[alpha_mask], %[temp0] \n\t" 72 "ext %[temp0], %[alpha_mask], 0, 8 \n\t" 73 "srl %[alpha_mask], %[alpha_mask], 8 \n\t" 74 "and %[alpha_mask], %[alpha_mask], %[temp0] \n\t" 75 : [temp0]"=&r"(temp0), [alpha_mask]"+r"(alpha_mask) 76 : 77 ); 78 79 return (alpha_mask != 0xff); 80 } 81 82 static void MultARGBRow(uint32_t* const ptr, int width, int inverse) { 83 int x; 84 const uint32_t c_00ffffff = 0x00ffffffu; 85 const uint32_t c_ff000000 = 0xff000000u; 86 const uint32_t c_8000000 = 0x00800000u; 87 const uint32_t c_8000080 = 0x00800080u; 88 for (x = 0; x < width; ++x) { 89 const uint32_t argb = ptr[x]; 90 if (argb < 0xff000000u) { // alpha < 255 91 if (argb <= 0x00ffffffu) { // alpha == 0 92 ptr[x] = 0; 93 } else { 94 int temp0, temp1, temp2, temp3, alpha; 95 __asm__ volatile ( 96 "srl %[alpha], %[argb], 24 \n\t" 97 "replv.qb %[temp0], %[alpha] \n\t" 98 "and %[temp0], %[temp0], %[c_00ffffff] \n\t" 99 "beqz %[inverse], 0f \n\t" 100 "divu $zero, %[c_ff000000], %[alpha] \n\t" 101 "mflo %[temp0] \n\t" 102 "0: \n\t" 103 "andi %[temp1], %[argb], 0xff \n\t" 104 "ext %[temp2], %[argb], 8, 8 \n\t" 105 "ext %[temp3], %[argb], 16, 8 \n\t" 106 "mul %[temp1], %[temp1], %[temp0] \n\t" 107 "mul %[temp2], %[temp2], %[temp0] \n\t" 108 "mul %[temp3], %[temp3], %[temp0] \n\t" 109 "precrq.ph.w %[temp1], %[temp2], %[temp1] \n\t" 110 "addu %[temp3], %[temp3], %[c_8000000] \n\t" 111 "addu %[temp1], %[temp1], %[c_8000080] \n\t" 112 "precrq.ph.w %[temp3], %[argb], %[temp3] \n\t" 113 "precrq.qb.ph %[temp1], %[temp3], %[temp1] \n\t" 114 : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp2]"=&r"(temp2), 115 [temp3]"=&r"(temp3), [alpha]"=&r"(alpha) 116 : [inverse]"r"(inverse), [c_00ffffff]"r"(c_00ffffff), 117 [c_8000000]"r"(c_8000000), [c_8000080]"r"(c_8000080), 118 [c_ff000000]"r"(c_ff000000), [argb]"r"(argb) 119 : "memory", "hi", "lo" 120 ); 121 ptr[x] = temp1; 122 } 123 } 124 } 125 } 126 127 //------------------------------------------------------------------------------ 128 // Entry point 129 130 extern void WebPInitAlphaProcessingMIPSdspR2(void); 131 132 WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingMIPSdspR2(void) { 133 WebPDispatchAlpha = DispatchAlpha; 134 WebPMultARGBRow = MultARGBRow; 135 } 136 137 #else // !WEBP_USE_MIPS_DSP_R2 138 139 WEBP_DSP_INIT_STUB(WebPInitAlphaProcessingMIPSdspR2) 140 141 #endif // WEBP_USE_MIPS_DSP_R2 142
