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annotate src/video/SDL_blit_copy.c @ 3097:0d12e8f1de3c

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Date: Thu, 05 Feb 2009 18:07:35 +0100 From: Stefan Klug Subject: [SDL] SDL 1.3 WinCE backend as promised, I've started to work on the WinCE backend of SDL 1.3 I've modified the win32 video backend and the gdi renderer, to work properly in WinCE. The results till now are great, but there is still some work to do. Attached are two patches with my changes. I would be happy if someone could review and propably commit them. The first one (configure.in.patch) should be straight forward without any side effects. The second one does the necessary changes to the win32 backend. I was really unhappy to start slicing this shiny new backend with #ifdef/#endif but I saw no other option. The most problematic issues are: - WinCe has no GetDIBits, so its practically impossible to fill a BITMAPINFO with correct values. I therefore removed the bmi member from the GDI_RenderData in SDL_gdirender.c to prevent usage of a not or not properly initialized bmi. - In SDL_win32window.c I exchanged some ASCII function by their general counterparts, (In CE only the Unicode versions are available). I don't know if this has a negative effect when running in win32 Cheers Stefan
author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Mar 2009 05:35:21 +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: */