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annotate src/video/SDL_blit_copy.c @ 3294:470d0a416aa7

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Fixed bug #714 fuzzyTew@gmail.com 2009-03-14 15:18:45 PDT patch to change HAVE_ICONV to HAVE_ICONV_H There are two separate iconv checks in configure -- one for the header file and one for the library. include/SDL_stdinc.h uses the library define to see whether or not it should reference the types defined in the header, which naturally breaks if the library exists and the header does not.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:04:01 +0000
parents 99210400e8b9
children 72024425b437
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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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: */