Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_copy.c @ 2993:2fad80c77c17
Technically more correct
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 04 Jan 2009 19:26:50 +0000 |
parents | 99210400e8b9 |
children | 72024425b437 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 #include "SDL_video.h" |
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25 #include "SDL_blit.h" |
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26 #include "SDL_blit_copy.h" |
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27 |
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28 |
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29 #ifdef __SSE__ |
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30 /* This assumes 16-byte aligned src and dst */ |
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31 static __inline__ void |
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32 SDL_memcpySSE(Uint8 * dst, const Uint8 * src, int len) |
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33 { |
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34 int i; |
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35 |
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36 __m128 values[4]; |
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37 for (i = len / 64; i--;) { |
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38 _mm_prefetch(src, _MM_HINT_NTA); |
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39 values[0] = *(__m128 *) (src + 0); |
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40 values[1] = *(__m128 *) (src + 16); |
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41 values[2] = *(__m128 *) (src + 32); |
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42 values[3] = *(__m128 *) (src + 48); |
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43 _mm_stream_ps((float *) (dst + 0), values[0]); |
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44 _mm_stream_ps((float *) (dst + 16), values[1]); |
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45 _mm_stream_ps((float *) (dst + 32), values[2]); |
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46 _mm_stream_ps((float *) (dst + 48), values[3]); |
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47 src += 64; |
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48 dst += 64; |
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49 } |
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50 |
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51 if (len & 63) |
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52 SDL_memcpy(dst, src, len & 63); |
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53 } |
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54 #endif /* __SSE__ */ |
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55 |
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56 #ifdef __MMX__ |
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57 #ifdef _MSC_VER |
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58 #pragma warning(disable:4799) |
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59 #endif |
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60 /* This assumes 8-byte aligned src and dst */ |
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61 static __inline__ void |
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62 SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len) |
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63 { |
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64 int i; |
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65 |
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66 __m64 values[8]; |
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67 for (i = len / 64; i--;) { |
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68 _mm_prefetch(src, _MM_HINT_NTA); |
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69 values[0] = *(__m64 *) (src + 0); |
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70 values[1] = *(__m64 *) (src + 8); |
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71 values[2] = *(__m64 *) (src + 16); |
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72 values[3] = *(__m64 *) (src + 24); |
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73 values[4] = *(__m64 *) (src + 32); |
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74 values[5] = *(__m64 *) (src + 40); |
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75 values[6] = *(__m64 *) (src + 48); |
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76 values[7] = *(__m64 *) (src + 56); |
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77 _mm_stream_pi((__m64 *) (dst + 0), values[0]); |
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78 _mm_stream_pi((__m64 *) (dst + 8), values[1]); |
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79 _mm_stream_pi((__m64 *) (dst + 16), values[2]); |
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80 _mm_stream_pi((__m64 *) (dst + 24), values[3]); |
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81 _mm_stream_pi((__m64 *) (dst + 32), values[4]); |
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82 _mm_stream_pi((__m64 *) (dst + 40), values[5]); |
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83 _mm_stream_pi((__m64 *) (dst + 48), values[6]); |
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84 _mm_stream_pi((__m64 *) (dst + 56), values[7]); |
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85 src += 64; |
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86 dst += 64; |
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87 } |
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88 |
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89 if (len & 63) |
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90 SDL_memcpy(dst, src, len & 63); |
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91 } |
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92 #endif /* __MMX__ */ |
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93 |
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94 void |
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95 SDL_BlitCopy(SDL_BlitInfo * info) |
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96 { |
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97 Uint8 *src, *dst; |
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98 int w, h; |
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99 int srcskip, dstskip; |
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100 |
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101 w = info->dst_w * info->dst_fmt->BytesPerPixel; |
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102 h = info->dst_h; |
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103 src = info->src; |
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104 dst = info->dst; |
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105 srcskip = info->src_pitch; |
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106 dstskip = info->dst_pitch; |
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107 |
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108 #ifdef __SSE__ |
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109 if (SDL_HasSSE() && |
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110 !((uintptr_t) src & 15) && !(srcskip & 15) && |
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111 !((uintptr_t) dst & 15) && !(dstskip & 15)) { |
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112 while (h--) { |
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113 SDL_memcpySSE(dst, src, w); |
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114 src += srcskip; |
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115 dst += dstskip; |
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116 } |
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117 return; |
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118 } |
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119 #endif |
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120 |
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121 #ifdef __MMX__ |
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122 if (SDL_HasMMX() && |
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123 !((uintptr_t) src & 7) && !(srcskip & 7) && |
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124 !((uintptr_t) dst & 7) && !(dstskip & 7)) { |
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125 while (h--) { |
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126 SDL_memcpyMMX(dst, src, w); |
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127 src += srcskip; |
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128 dst += dstskip; |
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129 } |
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130 _mm_empty(); |
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131 return; |
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132 } |
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133 #endif |
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134 |
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135 while (h--) { |
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136 SDL_memcpy(dst, src, w); |
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137 src += srcskip; |
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138 dst += dstskip; |
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139 } |
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140 } |
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141 |
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142 void |
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143 SDL_BlitCopyOverlap(SDL_BlitInfo * info) |
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144 { |
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145 Uint8 *src, *dst; |
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146 int w, h; |
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147 int skip; |
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148 |
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149 w = info->dst_w * info->dst_fmt->BytesPerPixel; |
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150 h = info->dst_h; |
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151 src = info->src; |
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152 dst = info->dst; |
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153 skip = info->src_pitch; |
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154 if ((dst < src) || (dst >= (src + h * skip))) { |
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155 SDL_BlitCopy(info); |
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156 } else { |
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157 src += ((h - 1) * skip); |
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158 dst += ((h - 1) * skip); |
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159 while (h--) { |
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160 SDL_revcpy(dst, src, w); |
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161 src -= skip; |
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162 dst -= skip; |
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163 } |
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164 } |
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165 } |
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166 |
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167 /* vi: set ts=4 sw=4 expandtab: */ |