annotate src/video/SDL_blit.c @ 1358:c71e05b4dc2e

More header massaging... works great on Windows. ;-)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 10 Feb 2006 06:48:43 +0000
parents 450721ad5436
children 19418e4422cb
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
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23 #include "SDL_video.h"
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24 #include "SDL_sysvideo.h"
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25 #include "SDL_blit.h"
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26 #include "SDL_RLEaccel_c.h"
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27 #include "SDL_pixels_c.h"
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28
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29 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT)
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30 #define MMX_ASMBLIT
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31 #endif
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32
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33 #if defined(MMX_ASMBLIT)
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34 #include "SDL_cpuinfo.h"
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35 #include "mmx.h"
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36 #endif
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37
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38 /* The general purpose software blit routine */
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39 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
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40 SDL_Surface *dst, SDL_Rect *dstrect)
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41 {
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42 int okay;
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43 int src_locked;
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44 int dst_locked;
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45
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46 /* Everything is okay at the beginning... */
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47 okay = 1;
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48
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49 /* Lock the destination if it's in hardware */
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50 dst_locked = 0;
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51 if ( SDL_MUSTLOCK(dst) ) {
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52 if ( SDL_LockSurface(dst) < 0 ) {
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53 okay = 0;
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54 } else {
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55 dst_locked = 1;
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56 }
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57 }
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58 /* Lock the source if it's in hardware */
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59 src_locked = 0;
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60 if ( SDL_MUSTLOCK(src) ) {
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61 if ( SDL_LockSurface(src) < 0 ) {
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62 okay = 0;
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63 } else {
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64 src_locked = 1;
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65 }
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66 }
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67
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68 /* Set up source and destination buffer pointers, and BLIT! */
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69 if ( okay && srcrect->w && srcrect->h ) {
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70 SDL_BlitInfo info;
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71 SDL_loblit RunBlit;
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72
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73 /* Set up the blit information */
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74 info.s_pixels = (Uint8 *)src->pixels +
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75 (Uint16)srcrect->y*src->pitch +
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76 (Uint16)srcrect->x*src->format->BytesPerPixel;
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77 info.s_width = srcrect->w;
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78 info.s_height = srcrect->h;
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79 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
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80 info.d_pixels = (Uint8 *)dst->pixels +
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81 (Uint16)dstrect->y*dst->pitch +
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82 (Uint16)dstrect->x*dst->format->BytesPerPixel;
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83 info.d_width = dstrect->w;
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84 info.d_height = dstrect->h;
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85 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
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86 info.aux_data = src->map->sw_data->aux_data;
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87 info.src = src->format;
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88 info.table = src->map->table;
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89 info.dst = dst->format;
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90 RunBlit = src->map->sw_data->blit;
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91
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92 /* Run the actual software blit */
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93 RunBlit(&info);
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94 }
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95
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96 /* We need to unlock the surfaces if they're locked */
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97 if ( dst_locked ) {
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98 SDL_UnlockSurface(dst);
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99 }
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100 if ( src_locked ) {
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101 SDL_UnlockSurface(src);
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102 }
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103 /* Blit is done! */
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104 return(okay ? 0 : -1);
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105 }
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106
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107 #ifdef MMX_ASMBLIT
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108 static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len)
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109 {
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110 int i;
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111
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112 for(i=0; i<len/8; i++) {
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113 __asm__ __volatile__ (
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114 " movq (%0), %%mm0\n"
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115 " movq %%mm0, (%1)\n"
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116 : : "r" (from), "r" (to) : "memory");
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117 from+=8;
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118 to+=8;
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119 }
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120 if (len&7)
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121 SDL_memcpy(to, from, len&7);
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122 }
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123
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124 static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len)
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125 {
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126 int i;
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127
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128 __asm__ __volatile__ (
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129 " prefetchnta (%0)\n"
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130 " prefetchnta 64(%0)\n"
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131 " prefetchnta 128(%0)\n"
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132 " prefetchnta 192(%0)\n"
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133 : : "r" (from) );
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134
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135 for(i=0; i<len/8; i++) {
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136 __asm__ __volatile__ (
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137 " prefetchnta 256(%0)\n"
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138 " movq (%0), %%mm0\n"
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139 " movntq %%mm0, (%1)\n"
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140 : : "r" (from), "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 SDL_BlitCopy(SDL_BlitInfo *info)
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150 {
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151 Uint8 *src, *dst;
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152 int w, h;
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153 int srcskip, dstskip;
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154
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155 w = info->d_width*info->dst->BytesPerPixel;
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156 h = info->d_height;
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157 src = info->s_pixels;
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158 dst = info->d_pixels;
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159 srcskip = w+info->s_skip;
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160 dstskip = w+info->d_skip;
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161 #ifdef MMX_ASMBLIT
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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162 if(SDL_HasSSE())
689
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163 {
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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__ (
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170 " emms\n"
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171 ::);
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172 }
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173 else
739
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174 if(SDL_HasMMX())
689
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175 {
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176 while ( h-- ) {
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177 SDL_memcpyMMX(dst, src, w);
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178 src += srcskip;
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179 dst += dstskip;
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180 }
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181 __asm__ __volatile__ (
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182 " emms\n"
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183 ::);
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184 }
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185 else
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186 #endif
0
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187 while ( h-- ) {
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188 SDL_memcpy(dst, src, w);
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189 src += srcskip;
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190 dst += dstskip;
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191 }
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192 }
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193
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194 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
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195 {
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196 Uint8 *src, *dst;
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197 int w, h;
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198 int srcskip, dstskip;
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199
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200 w = info->d_width*info->dst->BytesPerPixel;
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201 h = info->d_height;
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202 src = info->s_pixels;
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203 dst = info->d_pixels;
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204 srcskip = w+info->s_skip;
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205 dstskip = w+info->d_skip;
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206 if ( dst < src ) {
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207 while ( h-- ) {
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208 SDL_memcpy(dst, src, w);
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209 src += srcskip;
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210 dst += dstskip;
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211 }
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212 } else {
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213 src += ((h-1) * srcskip);
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214 dst += ((h-1) * dstskip);
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215 while ( h-- ) {
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216 SDL_revcpy(dst, src, w);
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217 src -= srcskip;
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218 dst -= dstskip;
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219 }
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220 }
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221 }
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diff changeset
222
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223 /* Figure out which of many blit routines to set up on a surface */
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224 int SDL_CalculateBlit(SDL_Surface *surface)
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225 {
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226 int blit_index;
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227
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228 /* Clean everything out to start */
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229 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
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230 SDL_UnRLESurface(surface, 1);
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231 }
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232 surface->map->sw_blit = NULL;
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233
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234 /* Figure out if an accelerated hardware blit is possible */
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235 surface->flags &= ~SDL_HWACCEL;
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236 if ( surface->map->identity ) {
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diff changeset
237 int hw_blit_ok;
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238
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239 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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diff changeset
240 /* We only support accelerated blitting to hardware */
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diff changeset
241 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
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242 hw_blit_ok = current_video->info.blit_hw;
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243 } else {
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244 hw_blit_ok = 0;
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diff changeset
245 }
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diff changeset
246 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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diff changeset
247 hw_blit_ok = current_video->info.blit_hw_CC;
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diff changeset
248 }
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249 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
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250 hw_blit_ok = current_video->info.blit_hw_A;
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diff changeset
251 }
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252 } else {
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253 /* We only support accelerated blitting to hardware */
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diff changeset
254 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
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diff changeset
255 hw_blit_ok = current_video->info.blit_sw;
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diff changeset
256 } else {
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257 hw_blit_ok = 0;
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diff changeset
258 }
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259 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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diff changeset
260 hw_blit_ok = current_video->info.blit_sw_CC;
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parents:
diff changeset
261 }
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262 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
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diff changeset
263 hw_blit_ok = current_video->info.blit_sw_A;
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diff changeset
264 }
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diff changeset
265 }
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diff changeset
266 if ( hw_blit_ok ) {
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diff changeset
267 SDL_VideoDevice *video = current_video;
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diff changeset
268 SDL_VideoDevice *this = current_video;
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diff changeset
269 video->CheckHWBlit(this, surface, surface->map->dst);
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diff changeset
270 }
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diff changeset
271 }
1052
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
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parents: 882
diff changeset
272
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
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273 /* if an alpha pixel format is specified, we can accelerate alpha blits */
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
274 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel))
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
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diff changeset
275 {
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
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diff changeset
276 if ( (surface->flags & SDL_SRCALPHA) )
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
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parents: 882
diff changeset
277 if ( current_video->info.blit_hw_A ) {
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
278 SDL_VideoDevice *video = current_video;
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
279 SDL_VideoDevice *this = current_video;
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diff changeset
280 video->CheckHWBlit(this, surface, surface->map->dst);
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parents: 882
diff changeset
281 }
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
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parents: 882
diff changeset
282 }
0
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parents:
diff changeset
283
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diff changeset
284 /* Get the blit function index, based on surface mode */
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parents:
diff changeset
285 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
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diff changeset
286 blit_index = 0;
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parents:
diff changeset
287 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
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parents:
diff changeset
288 if ( surface->flags & SDL_SRCALPHA
74212992fb08 Initial revision
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parents:
diff changeset
289 && (surface->format->alpha != SDL_ALPHA_OPAQUE
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parents:
diff changeset
290 || surface->format->Amask) ) {
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parents:
diff changeset
291 blit_index |= 2;
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parents:
diff changeset
292 }
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parents:
diff changeset
293
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parents:
diff changeset
294 /* Check for special "identity" case -- copy blit */
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parents:
diff changeset
295 if ( surface->map->identity && blit_index == 0 ) {
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parents:
diff changeset
296 surface->map->sw_data->blit = SDL_BlitCopy;
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parents:
diff changeset
297
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parents:
diff changeset
298 /* Handle overlapping blits on the same surface */
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parents:
diff changeset
299 if ( surface == surface->map->dst ) {
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parents:
diff changeset
300 surface->map->sw_data->blit = SDL_BlitCopyOverlap;
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parents:
diff changeset
301 }
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parents:
diff changeset
302 } else {
74212992fb08 Initial revision
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parents:
diff changeset
303 if ( surface->format->BitsPerPixel < 8 ) {
74212992fb08 Initial revision
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parents:
diff changeset
304 surface->map->sw_data->blit =
74212992fb08 Initial revision
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parents:
diff changeset
305 SDL_CalculateBlit0(surface, blit_index);
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parents:
diff changeset
306 } else {
74212992fb08 Initial revision
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parents:
diff changeset
307 switch ( surface->format->BytesPerPixel ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 surface->map->sw_data->blit =
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310 SDL_CalculateBlit1(surface, blit_index);
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311 break;
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312 case 2:
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313 case 3:
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314 case 4:
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315 surface->map->sw_data->blit =
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316 SDL_CalculateBlitN(surface, blit_index);
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317 break;
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318 default:
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319 surface->map->sw_data->blit = NULL;
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320 break;
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321 }
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322 }
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323 }
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324 /* Make sure we have a blit function */
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325 if ( surface->map->sw_data->blit == NULL ) {
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326 SDL_InvalidateMap(surface->map);
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327 SDL_SetError("Blit combination not supported");
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328 return(-1);
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329 }
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330
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331 /* Choose software blitting function */
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332 if(surface->flags & SDL_RLEACCELOK
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333 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
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334
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335 if(surface->map->identity
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336 && (blit_index == 1
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337 || (blit_index == 3 && !surface->format->Amask))) {
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338 if ( SDL_RLESurface(surface) == 0 )
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339 surface->map->sw_blit = SDL_RLEBlit;
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340 } else if(blit_index == 2 && surface->format->Amask) {
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341 if ( SDL_RLESurface(surface) == 0 )
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342 surface->map->sw_blit = SDL_RLEAlphaBlit;
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343 }
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344 }
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345
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346 if ( surface->map->sw_blit == NULL ) {
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347 surface->map->sw_blit = SDL_SoftBlit;
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348 }
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349 return(0);
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350 }
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351