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annotate src/video/SDL_blit.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents e49147870aac
children 4da1ee79c9af
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 }
0
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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 SDL_VideoDevice *_this = SDL_GetVideoDevice ();
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221 const SDL_VideoInfo *info = SDL_GetVideoInfo ();
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222 int blit_index;
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223
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224 /* Clean everything out to start */
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225 if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
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226 SDL_UnRLESurface (surface, 1);
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227 }
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228 surface->map->sw_blit = NULL;
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229
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230 /* Figure out if an accelerated hardware blit is possible */
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231 surface->flags &= ~SDL_HWACCEL;
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232 if (surface->map->identity) {
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233 int hw_blit_ok;
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234
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235 if ((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
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236 /* We only support accelerated blitting to hardware */
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237 if (surface->map->dst->flags & SDL_HWSURFACE) {
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238 hw_blit_ok = info->blit_hw;
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239 } else {
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240 hw_blit_ok = 0;
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241 }
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242 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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243 hw_blit_ok = info->blit_hw_CC;
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244 }
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245 if (hw_blit_ok && (surface->flags & SDL_SRCALPHA)) {
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246 hw_blit_ok = info->blit_hw_A;
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247 }
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248 } else {
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249 /* We only support accelerated blitting to hardware */
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250 if (surface->map->dst->flags & SDL_HWSURFACE) {
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251 hw_blit_ok = info->blit_sw;
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252 } else {
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253 hw_blit_ok = 0;
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254 }
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255 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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256 hw_blit_ok = info->blit_sw_CC;
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257 }
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258 if (hw_blit_ok && (surface->flags & SDL_SRCALPHA)) {
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259 hw_blit_ok = info->blit_sw_A;
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260 }
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261 }
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262 if (hw_blit_ok) {
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263 _this->CheckHWBlit (_this, surface, surface->map->dst);
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264 }
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265 }
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266
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267 /* if an alpha pixel format is specified, we can accelerate alpha blits */
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268 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE)
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269 && (_this->displayformatalphapixel)) {
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270 if ((surface->flags & SDL_SRCALPHA))
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271 if (info->blit_hw_A) {
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272 _this->CheckHWBlit (_this, surface, surface->map->dst);
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273 }
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274 }
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275
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276 /* Get the blit function index, based on surface mode */
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277 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
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278 blit_index = 0;
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279 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
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280 if (surface->flags & SDL_SRCALPHA
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281 && (surface->format->alpha != SDL_ALPHA_OPAQUE
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282 || surface->format->Amask)) {
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283 blit_index |= 2;
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284 }
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285
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286 /* Check for special "identity" case -- copy blit */
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287 if (surface->map->identity && blit_index == 0) {
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288 surface->map->sw_data->blit = SDL_BlitCopy;
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289
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290 /* Handle overlapping blits on the same surface */
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291 if (surface == surface->map->dst) {
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292 surface->map->sw_data->blit = SDL_BlitCopyOverlap;
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293 }
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294 } else {
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295 if (surface->format->BitsPerPixel < 8) {
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296 surface->map->sw_data->blit =
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297 SDL_CalculateBlit0 (surface, blit_index);
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298 } else {
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299 switch (surface->format->BytesPerPixel) {
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300 case 1:
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301 surface->map->sw_data->blit =
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302 SDL_CalculateBlit1 (surface, blit_index);
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303 break;
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304 case 2:
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305 case 3:
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306 case 4:
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307 surface->map->sw_data->blit =
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308 SDL_CalculateBlitN (surface, blit_index);
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309 break;
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310 default:
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311 surface->map->sw_data->blit = NULL;
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312 break;
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313 }
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314 }
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315 }
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316 /* Make sure we have a blit function */
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317 if (surface->map->sw_data->blit == NULL) {
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318 SDL_InvalidateMap (surface->map);
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319 SDL_SetError ("Blit combination not supported");
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320 return (-1);
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diff changeset
321 }
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322
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323 /* Choose software blitting function */
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diff changeset
324 if (surface->flags & SDL_RLEACCELOK
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diff changeset
325 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
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diff changeset
326
1662
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diff changeset
327 if (surface->map->identity
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diff changeset
328 && (blit_index == 1
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diff changeset
329 || (blit_index == 3 && !surface->format->Amask))) {
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diff changeset
330 if (SDL_RLESurface (surface) == 0)
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diff changeset
331 surface->map->sw_blit = SDL_RLEBlit;
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diff changeset
332 } else if (blit_index == 2 && surface->format->Amask) {
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diff changeset
333 if (SDL_RLESurface (surface) == 0)
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diff changeset
334 surface->map->sw_blit = SDL_RLEAlphaBlit;
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diff changeset
335 }
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diff changeset
336 }
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diff changeset
337
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diff changeset
338 if (surface->map->sw_blit == NULL) {
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diff changeset
339 surface->map->sw_blit = SDL_SoftBlit;
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340 }
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diff changeset
341 return (0);
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diff changeset
342 }
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diff changeset
343
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diff changeset
344 /* vi: set ts=4 sw=4 expandtab: */