annotate src/video/SDL_blit.c @ 882:9301b429c99f

Date: Sun, 11 Apr 2004 13:09:44 +0200 From: Stephane Marchesin Subject: [SDL] [Patch] inlining memcpy functions I (finally) did some benchmarking of the misc mmx & sse blitting functions, and found a little bottleneck in the memcpy ones : you get ~10% more performance on small surface blitting if you inline them.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Apr 2004 19:52:58 +0000
parents 9ef41050100c
children 68f607298ca9
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <stdlib.h>
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30 #include <string.h>
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31
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32 #include "SDL_error.h"
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33 #include "SDL_video.h"
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34 #include "SDL_sysvideo.h"
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35 #include "SDL_blit.h"
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36 #include "SDL_RLEaccel_c.h"
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37 #include "SDL_pixels_c.h"
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38 #include "SDL_memops.h"
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39
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40 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT)
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41 #define MMX_ASMBLIT
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42 #endif
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43
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44 #if defined(MMX_ASMBLIT)
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45 #include "SDL_cpuinfo.h"
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46 #include "mmx.h"
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47 #endif
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48
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49 /* The general purpose software blit routine */
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50 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
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51 SDL_Surface *dst, SDL_Rect *dstrect)
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52 {
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53 int okay;
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54 int src_locked;
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55 int dst_locked;
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56
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57 /* Everything is okay at the beginning... */
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58 okay = 1;
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59
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60 /* Lock the destination if it's in hardware */
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61 dst_locked = 0;
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62 if ( SDL_MUSTLOCK(dst) ) {
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63 if ( SDL_LockSurface(dst) < 0 ) {
0
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64 okay = 0;
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65 } else {
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66 dst_locked = 1;
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67 }
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68 }
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69 /* Lock the source if it's in hardware */
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70 src_locked = 0;
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71 if ( SDL_MUSTLOCK(src) ) {
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72 if ( SDL_LockSurface(src) < 0 ) {
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73 okay = 0;
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74 } else {
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75 src_locked = 1;
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76 }
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77 }
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78
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79 /* Set up source and destination buffer pointers, and BLIT! */
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80 if ( okay && srcrect->w && srcrect->h ) {
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81 SDL_BlitInfo info;
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82 SDL_loblit RunBlit;
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83
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84 /* Set up the blit information */
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85 info.s_pixels = (Uint8 *)src->pixels +
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86 (Uint16)srcrect->y*src->pitch +
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87 (Uint16)srcrect->x*src->format->BytesPerPixel;
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88 info.s_width = srcrect->w;
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89 info.s_height = srcrect->h;
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90 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
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91 info.d_pixels = (Uint8 *)dst->pixels +
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92 (Uint16)dstrect->y*dst->pitch +
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93 (Uint16)dstrect->x*dst->format->BytesPerPixel;
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94 info.d_width = dstrect->w;
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95 info.d_height = dstrect->h;
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96 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
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97 info.aux_data = src->map->sw_data->aux_data;
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98 info.src = src->format;
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99 info.table = src->map->table;
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100 info.dst = dst->format;
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101 RunBlit = src->map->sw_data->blit;
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102
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103 /* Run the actual software blit */
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104 RunBlit(&info);
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105 }
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106
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107 /* We need to unlock the surfaces if they're locked */
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108 if ( dst_locked ) {
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109 SDL_UnlockSurface(dst);
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110 }
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111 if ( src_locked ) {
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112 SDL_UnlockSurface(src);
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113 }
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114 /* Blit is done! */
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115 return(okay ? 0 : -1);
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116 }
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117
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118 #ifdef MMX_ASMBLIT
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119 static __inline__ void SDL_memcpyMMX(char* to,char* from,int len)
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120 {
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121 int i;
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122
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123 for(i=0; i<len/8; i++) {
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124 __asm__ __volatile__ (
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125 " movq (%0), %%mm0\n"
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126 " movq %%mm0, (%1)\n"
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127 : : "r" (from), "r" (to) : "memory");
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128 from+=8;
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129 to+=8;
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130 }
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131 if (len&7)
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132 SDL_memcpy(to, from, len&7);
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133 }
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134
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135 static __inline__ void SDL_memcpySSE(char* to,char* from,int len)
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136 {
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137 int i;
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138
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139 __asm__ __volatile__ (
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140 " prefetchnta (%0)\n"
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141 " prefetchnta 64(%0)\n"
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142 " prefetchnta 128(%0)\n"
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143 " prefetchnta 192(%0)\n"
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144 : : "r" (from) );
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145
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146 for(i=0; i<len/8; i++) {
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147 __asm__ __volatile__ (
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148 " prefetchnta 256(%0)\n"
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149 " movq (%0), %%mm0\n"
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150 " movntq %%mm0, (%1)\n"
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151 : : "r" (from), "r" (to) : "memory");
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152 from+=8;
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
153 to+=8;
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
154 }
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
155 if (len&7)
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
156 SDL_memcpy(to, from, len&7);
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
157 }
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
158 #endif
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
159
0
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parents:
diff changeset
160 static void SDL_BlitCopy(SDL_BlitInfo *info)
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parents:
diff changeset
161 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
162 Uint8 *src, *dst;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
163 int w, h;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
164 int srcskip, dstskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
165
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
166 w = info->d_width*info->dst->BytesPerPixel;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
167 h = info->d_height;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
168 src = info->s_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
169 dst = info->d_pixels;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
170 srcskip = w+info->s_skip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
171 dstskip = w+info->d_skip;
880
9ef41050100c Date: Tue, 30 Mar 2004 21:26:47 -0600
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
172 #ifdef MMX_ASMBLIT
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents: 697
diff changeset
173 if(SDL_HasSSE())
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
174 {
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
175 while ( h-- ) {
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
176 SDL_memcpySSE(dst, src, w);
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
177 src += srcskip;
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
178 dst += dstskip;
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
179 }
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
180 __asm__ __volatile__ (
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
181 " emms\n"
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
182 ::);
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
183 }
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
184 else
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents: 697
diff changeset
185 if(SDL_HasMMX())
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
186 {
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
187 while ( h-- ) {
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
188 SDL_memcpyMMX(dst, src, w);
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
189 src += srcskip;
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
190 dst += dstskip;
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
191 }
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
192 __asm__ __volatile__ (
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
193 " emms\n"
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
194 ::);
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
195 }
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
196 else
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
197 #endif
0
74212992fb08 Initial revision
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parents:
diff changeset
198 while ( h-- ) {
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parents:
diff changeset
199 SDL_memcpy(dst, src, w);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
200 src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
201 dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
202 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
203 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
204
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
205 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
206 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
207 Uint8 *src, *dst;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
208 int w, h;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
209 int srcskip, dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
210
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
211 w = info->d_width*info->dst->BytesPerPixel;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
212 h = info->d_height;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
213 src = info->s_pixels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
214 dst = info->d_pixels;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
215 srcskip = w+info->s_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
216 dstskip = w+info->d_skip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
217 if ( dst < src ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
218 while ( h-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
219 SDL_memcpy(dst, src, w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
220 src += srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
221 dst += dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
222 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
223 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
224 src += ((h-1) * srcskip);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
225 dst += ((h-1) * dstskip);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
226 while ( h-- ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
227 SDL_revcpy(dst, src, w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
228 src -= srcskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
229 dst -= dstskip;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
230 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
231 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
232 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
233
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
234 /* Figure out which of many blit routines to set up on a surface */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
235 int SDL_CalculateBlit(SDL_Surface *surface)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
236 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 int blit_index;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239 /* Clean everything out to start */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 SDL_UnRLESurface(surface, 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243 surface->map->sw_blit = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245 /* Figure out if an accelerated hardware blit is possible */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 surface->flags &= ~SDL_HWACCEL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
247 if ( surface->map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
248 int hw_blit_ok;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
249
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
250 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
251 /* We only support accelerated blitting to hardware */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
252 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
253 hw_blit_ok = current_video->info.blit_hw;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
254 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 hw_blit_ok = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
258 hw_blit_ok = current_video->info.blit_hw_CC;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 hw_blit_ok = current_video->info.blit_hw_A;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264 /* We only support accelerated blitting to hardware */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 hw_blit_ok = current_video->info.blit_sw;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 hw_blit_ok = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 hw_blit_ok = current_video->info.blit_sw_CC;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 hw_blit_ok = current_video->info.blit_sw_A;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 if ( hw_blit_ok ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 SDL_VideoDevice *video = current_video;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279 SDL_VideoDevice *this = current_video;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 video->CheckHWBlit(this, surface, surface->map->dst);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 /* Get the blit function index, based on surface mode */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 blit_index = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 if ( surface->flags & SDL_SRCALPHA
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 && (surface->format->alpha != SDL_ALPHA_OPAQUE
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290 || surface->format->Amask) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 blit_index |= 2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294 /* Check for special "identity" case -- copy blit */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 if ( surface->map->identity && blit_index == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 surface->map->sw_data->blit = SDL_BlitCopy;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298 /* Handle overlapping blits on the same surface */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299 if ( surface == surface->map->dst ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300 surface->map->sw_data->blit = SDL_BlitCopyOverlap;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 if ( surface->format->BitsPerPixel < 8 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 surface->map->sw_data->blit =
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 SDL_CalculateBlit0(surface, blit_index);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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 =
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 SDL_CalculateBlit1(surface, blit_index);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 case 2:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 case 3:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
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