annotate src/video/SDL_blit.c @ 1420:2405517b5eab

Added preliminary support for MiNT /dev/mouse driver (disabled atm)
author Patrice Mandin <patmandin@gmail.com>
date Thu, 23 Feb 2006 21:51:10 +0000
parents d910939febfa
children e49147870aac c121d94672cb 6832b00d3594
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 SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
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41 SDL_Surface *dst, SDL_Rect *dstrect)
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42 {
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43 int okay;
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44 int src_locked;
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45 int dst_locked;
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46
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47 /* Everything is okay at the beginning... */
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48 okay = 1;
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49
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50 /* Lock the destination if it's in hardware */
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51 dst_locked = 0;
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52 if ( SDL_MUSTLOCK(dst) ) {
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53 if ( SDL_LockSurface(dst) < 0 ) {
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54 okay = 0;
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55 } else {
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56 dst_locked = 1;
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57 }
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58 }
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59 /* Lock the source if it's in hardware */
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60 src_locked = 0;
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61 if ( SDL_MUSTLOCK(src) ) {
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62 if ( SDL_LockSurface(src) < 0 ) {
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63 okay = 0;
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64 } else {
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65 src_locked = 1;
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66 }
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67 }
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68
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69 /* Set up source and destination buffer pointers, and BLIT! */
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70 if ( okay && srcrect->w && srcrect->h ) {
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71 SDL_BlitInfo info;
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72 SDL_loblit RunBlit;
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73
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74 /* Set up the blit information */
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75 info.s_pixels = (Uint8 *)src->pixels +
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76 (Uint16)srcrect->y*src->pitch +
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77 (Uint16)srcrect->x*src->format->BytesPerPixel;
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78 info.s_width = srcrect->w;
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79 info.s_height = srcrect->h;
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80 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
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81 info.d_pixels = (Uint8 *)dst->pixels +
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82 (Uint16)dstrect->y*dst->pitch +
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83 (Uint16)dstrect->x*dst->format->BytesPerPixel;
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84 info.d_width = dstrect->w;
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85 info.d_height = dstrect->h;
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86 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
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87 info.aux_data = src->map->sw_data->aux_data;
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88 info.src = src->format;
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89 info.table = src->map->table;
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90 info.dst = dst->format;
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91 RunBlit = src->map->sw_data->blit;
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92
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93 /* Run the actual software blit */
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94 RunBlit(&info);
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95 }
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96
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97 /* We need to unlock the surfaces if they're locked */
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98 if ( dst_locked ) {
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99 SDL_UnlockSurface(dst);
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100 }
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101 if ( src_locked ) {
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102 SDL_UnlockSurface(src);
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103 }
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104 /* Blit is done! */
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105 return(okay ? 0 : -1);
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106 }
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107
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108 #ifdef MMX_ASMBLIT
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109 static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len)
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110 {
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111 int i;
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112
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113 for(i=0; i<len/8; i++) {
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114 __asm__ __volatile__ (
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115 " movq (%0), %%mm0\n"
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116 " movq %%mm0, (%1)\n"
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117 : : "r" (from), "r" (to) : "memory");
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118 from+=8;
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119 to+=8;
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120 }
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121 if (len&7)
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122 SDL_memcpy(to, from, len&7);
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123 }
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124
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125 static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len)
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126 {
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127 int i;
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128
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129 __asm__ __volatile__ (
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130 " prefetchnta (%0)\n"
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131 " prefetchnta 64(%0)\n"
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132 " prefetchnta 128(%0)\n"
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133 " prefetchnta 192(%0)\n"
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134 : : "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__ (
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138 " prefetchnta 256(%0)\n"
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139 " movq (%0), %%mm0\n"
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140 " movntq %%mm0, (%1)\n"
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141 : : "r" (from), "r" (to) : "memory");
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142 from+=8;
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143 to+=8;
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144 }
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145 if (len&7)
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146 SDL_memcpy(to, from, len&7);
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147 }
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148 #endif
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149
0
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parents:
diff changeset
150 static void SDL_BlitCopy(SDL_BlitInfo *info)
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parents:
diff changeset
151 {
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152 Uint8 *src, *dst;
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diff changeset
153 int w, h;
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parents:
diff changeset
154 int srcskip, dstskip;
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parents:
diff changeset
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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diff changeset
158 src = info->s_pixels;
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parents:
diff changeset
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;
880
9ef41050100c Date: Tue, 30 Mar 2004 21:26:47 -0600
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
162 #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
163 if(SDL_HasSSE())
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
164 {
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
165 while ( h-- ) {
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parents: 526
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166 SDL_memcpySSE(dst, src, w);
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parents: 526
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167 src += srcskip;
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parents: 526
diff changeset
168 dst += dstskip;
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
169 }
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
170 __asm__ __volatile__ (
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
171 " emms\n"
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
172 ::);
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
173 }
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
174 else
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents: 697
diff changeset
175 if(SDL_HasMMX())
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
176 {
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
177 while ( h-- ) {
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parents: 526
diff changeset
178 SDL_memcpyMMX(dst, src, w);
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179 src += srcskip;
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180 dst += dstskip;
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parents: 526
diff changeset
181 }
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parents: 526
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182 __asm__ __volatile__ (
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parents: 526
diff changeset
183 " emms\n"
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
184 ::);
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
185 }
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
186 else
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Sam Lantinga <slouken@libsdl.org>
parents: 526
diff changeset
187 #endif
0
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188 while ( h-- ) {
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189 SDL_memcpy(dst, src, w);
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190 src += srcskip;
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191 dst += dstskip;
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192 }
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193 }
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194
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195 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
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196 {
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197 Uint8 *src, *dst;
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198 int w, h;
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199 int srcskip, dstskip;
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parents:
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200
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201 w = info->d_width*info->dst->BytesPerPixel;
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202 h = info->d_height;
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203 src = info->s_pixels;
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diff changeset
204 dst = info->d_pixels;
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diff changeset
205 srcskip = w+info->s_skip;
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parents:
diff changeset
206 dstskip = w+info->d_skip;
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parents:
diff changeset
207 if ( dst < src ) {
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parents:
diff changeset
208 while ( h-- ) {
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parents:
diff changeset
209 SDL_memcpy(dst, src, w);
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parents:
diff changeset
210 src += srcskip;
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diff changeset
211 dst += dstskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
212 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
213 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
214 src += ((h-1) * srcskip);
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diff changeset
215 dst += ((h-1) * dstskip);
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parents:
diff changeset
216 while ( h-- ) {
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parents:
diff changeset
217 SDL_revcpy(dst, src, w);
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diff changeset
218 src -= srcskip;
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diff changeset
219 dst -= dstskip;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
220 }
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parents:
diff changeset
221 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
222 }
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parents:
diff changeset
223
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parents:
diff changeset
224 /* Figure out which of many blit routines to set up on a surface */
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parents:
diff changeset
225 int SDL_CalculateBlit(SDL_Surface *surface)
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parents:
diff changeset
226 {
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parents:
diff changeset
227 int blit_index;
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parents:
diff changeset
228
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parents:
diff changeset
229 /* Clean everything out to start */
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
230 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
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parents:
diff changeset
231 SDL_UnRLESurface(surface, 1);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
232 }
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Sam Lantinga <slouken@lokigames.com>
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diff changeset
233 surface->map->sw_blit = NULL;
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parents:
diff changeset
234
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diff changeset
235 /* Figure out if an accelerated hardware blit is possible */
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diff changeset
236 surface->flags &= ~SDL_HWACCEL;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 if ( surface->map->identity ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238 int hw_blit_ok;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 /* We only support accelerated blitting to hardware */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243 hw_blit_ok = current_video->info.blit_hw;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245 hw_blit_ok = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
247 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
248 hw_blit_ok = current_video->info.blit_hw_CC;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
249 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
250 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
251 hw_blit_ok = current_video->info.blit_hw_A;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
252 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
253 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
254 /* We only support accelerated blitting to hardware */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256 hw_blit_ok = current_video->info.blit_sw;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 } else {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
258 hw_blit_ok = 0;
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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_SRCCOLORKEY)) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 hw_blit_ok = current_video->info.blit_sw_CC;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264 hw_blit_ok = current_video->info.blit_sw_A;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 if ( hw_blit_ok ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 SDL_VideoDevice *video = current_video;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 SDL_VideoDevice *this = current_video;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 video->CheckHWBlit(this, surface, surface->map->dst);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 }
1052
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
273
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
274 /* 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
275 if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel))
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
276 {
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
277 if ( (surface->flags & SDL_SRCALPHA) )
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
278 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
279 SDL_VideoDevice *video = current_video;
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
280 SDL_VideoDevice *this = current_video;
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
281 video->CheckHWBlit(this, surface, surface->map->dst);
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
282 }
68f607298ca9 Some work on using accelerated alpha blits with hardware surfaces.
Ryan C. Gordon <icculus@icculus.org>
parents: 882
diff changeset
283 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 /* Get the blit function index, based on surface mode */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 blit_index = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 if ( surface->flags & SDL_SRCALPHA
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290 && (surface->format->alpha != SDL_ALPHA_OPAQUE
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 || surface->format->Amask) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 blit_index |= 2;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294
74212992fb08 Initial revision
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parents:
diff changeset
295 /* Check for special "identity" case -- copy blit */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 if ( surface->map->identity && blit_index == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 surface->map->sw_data->blit = SDL_BlitCopy;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299 /* Handle overlapping blits on the same surface */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300 if ( surface == surface->map->dst ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 surface->map->sw_data->blit = SDL_BlitCopyOverlap;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 if ( surface->format->BitsPerPixel < 8 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 surface->map->sw_data->blit =
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 SDL_CalculateBlit0(surface, blit_index);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 switch ( surface->format->BytesPerPixel ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 case 1:
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310 surface->map->sw_data->blit =
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311 SDL_CalculateBlit1(surface, blit_index);
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312 break;
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313 case 2:
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314 case 3:
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315 case 4:
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316 surface->map->sw_data->blit =
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317 SDL_CalculateBlitN(surface, blit_index);
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318 break;
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319 default:
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320 surface->map->sw_data->blit = NULL;
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321 break;
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322 }
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323 }
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324 }
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325 /* Make sure we have a blit function */
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326 if ( surface->map->sw_data->blit == NULL ) {
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327 SDL_InvalidateMap(surface->map);
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328 SDL_SetError("Blit combination not supported");
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329 return(-1);
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330 }
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331
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332 /* Choose software blitting function */
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333 if(surface->flags & SDL_RLEACCELOK
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334 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
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335
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336 if(surface->map->identity
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337 && (blit_index == 1
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338 || (blit_index == 3 && !surface->format->Amask))) {
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339 if ( SDL_RLESurface(surface) == 0 )
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340 surface->map->sw_blit = SDL_RLEBlit;
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341 } else if(blit_index == 2 && surface->format->Amask) {
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342 if ( SDL_RLESurface(surface) == 0 )
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343 surface->map->sw_blit = SDL_RLEAlphaBlit;
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344 }
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345 }
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346
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347 if ( surface->map->sw_blit == NULL ) {
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348 surface->map->sw_blit = SDL_SoftBlit;
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349 }
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350 return(0);
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351 }
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352