Mercurial > sdl-ios-xcode

annotate src/video/SDL_blit.c @ 1734:f7c667ded87d SDL-1.3

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The general code handles restoring video mode/gamma/etc. when the window loses focus. Support for changing fullscreen/windowed mode in progress.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 09 Jul 2006 18:09:16 +0000
parents eef792d31de8
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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_sysvideo.h"
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26 #include "SDL_blit.h"
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27 #include "SDL_RLEaccel_c.h"
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28 #include "SDL_pixels_c.h"
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29
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30 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES
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31 #define MMX_ASMBLIT
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32 #endif
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33
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34 #if defined(MMX_ASMBLIT)
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35 #include "SDL_cpuinfo.h"
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36 #include "mmx.h"
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37 #endif
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38
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39 /* The general purpose software blit routine */
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40 static int
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41 SDL_SoftBlit(SDL_Surface * src, SDL_Rect * srcrect,
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42 SDL_Surface * dst, SDL_Rect * dstrect)
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43 {
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44 int okay;
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45 int src_locked;
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46 int dst_locked;
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47
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48 /* Everything is okay at the beginning... */
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49 okay = 1;
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50
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51 /* Lock the destination if it's in hardware */
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52 dst_locked = 0;
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53 if (SDL_MUSTLOCK(dst)) {
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54 if (SDL_LockSurface(dst) < 0) {
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55 okay = 0;
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56 } else {
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57 dst_locked = 1;
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58 }
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59 }
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60 /* Lock the source if it's in hardware */
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61 src_locked = 0;
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62 if (SDL_MUSTLOCK(src)) {
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63 if (SDL_LockSurface(src) < 0) {
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64 okay = 0;
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65 } else {
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66 src_locked = 1;
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67 }
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68 }
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69
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70 /* Set up source and destination buffer pointers, and BLIT! */
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71 if (okay && srcrect->w && srcrect->h) {
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72 SDL_BlitInfo info;
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73 SDL_loblit RunBlit;
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74
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75 /* Set up the blit information */
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76 info.s_pixels = (Uint8 *) src->pixels +
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77 (Uint16) srcrect->y * src->pitch +
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78 (Uint16) srcrect->x * src->format->BytesPerPixel;
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79 info.s_width = srcrect->w;
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80 info.s_height = srcrect->h;
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81 info.s_skip = src->pitch - info.s_width * src->format->BytesPerPixel;
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82 info.d_pixels = (Uint8 *) dst->pixels +
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83 (Uint16) dstrect->y * dst->pitch +
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84 (Uint16) dstrect->x * dst->format->BytesPerPixel;
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85 info.d_width = dstrect->w;
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86 info.d_height = dstrect->h;
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87 info.d_skip = dst->pitch - info.d_width * dst->format->BytesPerPixel;
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88 info.aux_data = src->map->sw_data->aux_data;
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89 info.src = src->format;
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90 info.table = src->map->table;
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91 info.dst = dst->format;
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92 RunBlit = src->map->sw_data->blit;
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93
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94 /* Run the actual software blit */
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95 RunBlit(&info);
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96 }
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97
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98 /* We need to unlock the surfaces if they're locked */
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99 if (dst_locked) {
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100 SDL_UnlockSurface(dst);
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101 }
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102 if (src_locked) {
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103 SDL_UnlockSurface(src);
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104 }
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105 /* Blit is done! */
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106 return (okay ? 0 : -1);
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107 }
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108
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109 #ifdef MMX_ASMBLIT
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110 static __inline__ void
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111 SDL_memcpyMMX(Uint8 * to, const Uint8 * from, int len)
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112 {
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113 int i;
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114
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115 for (i = 0; i < len / 8; i++) {
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116 __asm__ __volatile__(" movq (%0), %%mm0\n"
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117 " movq %%mm0, (%1)\n"::"r"(from),
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118 "r"(to):"memory");
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119 from += 8;
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120 to += 8;
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121 }
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122 if (len & 7)
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123 SDL_memcpy(to, from, len & 7);
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124 }
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125
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126 static __inline__ void
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127 SDL_memcpySSE(Uint8 * to, const Uint8 * from, int len)
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128 {
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129 int i;
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130
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131 __asm__ __volatile__(" prefetchnta (%0)\n"
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132 " prefetchnta 64(%0)\n"
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133 " prefetchnta 128(%0)\n"
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134 " prefetchnta 192(%0)\n"::"r"(from));
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135
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136 for (i = 0; i < len / 8; i++) {
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137 __asm__ __volatile__(" prefetchnta 256(%0)\n"
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138 " movq (%0), %%mm0\n"
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139 " movntq %%mm0, (%1)\n"::"r"(from),
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140 "r"(to):"memory");
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141 from += 8;
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142 to += 8;
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143 }
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144 if (len & 7)
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145 SDL_memcpy(to, from, len & 7);
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146 }
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147 #endif
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148
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149 static void
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150 SDL_BlitCopy(SDL_BlitInfo * info)
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151 {
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152 Uint8 *src, *dst;
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153 int w, h;
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154 int srcskip, dstskip;
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155
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156 w = info->d_width * info->dst->BytesPerPixel;
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157 h = info->d_height;
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158 src = info->s_pixels;
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159 dst = info->d_pixels;
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160 srcskip = w + info->s_skip;
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161 dstskip = w + info->d_skip;
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162 #ifdef MMX_ASMBLIT
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163 if (SDL_HasSSE()) {
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164 while (h--) {
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165 SDL_memcpySSE(dst, src, w);
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166 src += srcskip;
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167 dst += dstskip;
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168 }
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169 __asm__ __volatile__(" emms\n"::);
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170 } else if (SDL_HasMMX()) {
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171 while (h--) {
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172 SDL_memcpyMMX(dst, src, w);
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173 src += srcskip;
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174 dst += dstskip;
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175 }
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176 __asm__ __volatile__(" emms\n"::);
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177 } else
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178 #endif
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179 while (h--) {
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180 SDL_memcpy(dst, src, w);
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181 src += srcskip;
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182 dst += dstskip;
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183 }
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184 }
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185
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186 static void
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187 SDL_BlitCopyOverlap(SDL_BlitInfo * info)
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188 {
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189 Uint8 *src, *dst;
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190 int w, h;
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191 int srcskip, dstskip;
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192
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193 w = info->d_width * info->dst->BytesPerPixel;
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194 h = info->d_height;
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195 src = info->s_pixels;
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196 dst = info->d_pixels;
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197 srcskip = w + info->s_skip;
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198 dstskip = w + info->d_skip;
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199 if (dst < src) {
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200 while (h--) {
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201 SDL_memcpy(dst, src, w);
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202 src += srcskip;
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203 dst += dstskip;
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204 }
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205 } else {
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206 src += ((h - 1) * srcskip);
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207 dst += ((h - 1) * dstskip);
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208 while (h--) {
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209 SDL_revcpy(dst, src, w);
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210 src -= srcskip;
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211 dst -= dstskip;
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212 }
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213 }
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214 }
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215
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216 /* Figure out which of many blit routines to set up on a surface */
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217 int
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218 SDL_CalculateBlit(SDL_Surface * surface)
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219 {
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220 int blit_index;
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221
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222 /* Clean everything out to start */
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223 if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
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224 SDL_UnRLESurface(surface, 1);
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225 }
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226 surface->map->sw_blit = NULL;
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227
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228 /* Get the blit function index, based on surface mode */
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229 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
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230 blit_index = 0;
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231 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
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232 if (surface->flags & SDL_SRCALPHA
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233 && (surface->format->alpha != SDL_ALPHA_OPAQUE
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234 || surface->format->Amask)) {
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235 blit_index |= 2;
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236 }
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237
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238 /* Check for special "identity" case -- copy blit */
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239 if (surface->map->identity && blit_index == 0) {
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240 surface->map->sw_data->blit = SDL_BlitCopy;
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241
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242 /* Handle overlapping blits on the same surface */
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243 if (surface == surface->map->dst) {
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244 surface->map->sw_data->blit = SDL_BlitCopyOverlap;
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245 }
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246 } else {
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247 if (surface->format->BitsPerPixel < 8) {
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248 surface->map->sw_data->blit =
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249 SDL_CalculateBlit0(surface, blit_index);
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250 } else {
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251 switch (surface->format->BytesPerPixel) {
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252 case 1:
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253 surface->map->sw_data->blit =
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254 SDL_CalculateBlit1(surface, blit_index);
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255 break;
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256 case 2:
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257 case 3:
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258 case 4:
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259 surface->map->sw_data->blit =
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260 SDL_CalculateBlitN(surface, blit_index);
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261 break;
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262 default:
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263 surface->map->sw_data->blit = NULL;
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264 break;
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265 }
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266 }
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267 }
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268 /* Make sure we have a blit function */
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269 if (surface->map->sw_data->blit == NULL) {
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270 SDL_InvalidateMap(surface->map);
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271 SDL_SetError("Blit combination not supported");
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272 return (-1);
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273 }
0
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274
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275 /* Choose software blitting function */
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276 if (surface->flags & SDL_RLEACCELOK) {
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277 if (surface->map->identity
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278 && (blit_index == 1
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279 || (blit_index == 3 && !surface->format->Amask))) {
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280 if (SDL_RLESurface(surface) == 0)
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281 surface->map->sw_blit = SDL_RLEBlit;
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282 } else if (blit_index == 2 && surface->format->Amask) {
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283 if (SDL_RLESurface(surface) == 0)
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284 surface->map->sw_blit = SDL_RLEAlphaBlit;
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285 }
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286 }
0
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287
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288 if (surface->map->sw_blit == NULL) {
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289 surface->map->sw_blit = SDL_SoftBlit;
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290 }
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291 return (0);
0
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292 }
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293
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294 /* vi: set ts=4 sw=4 expandtab: */