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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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@devolution.com
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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 /* The general purpose software blit routine */
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41 static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
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42 SDL_Surface *dst, SDL_Rect *dstrect)
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43 {
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44 int okay;
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45 int src_locked;
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46 int dst_locked;
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47
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48 /* Everything is okay at the beginning... */
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49 okay = 1;
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50
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51 /* Lock the destination if it's in hardware */
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52 dst_locked = 0;
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53 if ( dst->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
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54 SDL_VideoDevice *video = current_video;
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55 SDL_VideoDevice *this = current_video;
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56 if ( video->LockHWSurface(this, dst) < 0 ) {
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57 okay = 0;
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58 } else {
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59 dst_locked = 1;
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60 }
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61 }
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62 /* Lock the source if it's in hardware */
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63 src_locked = 0;
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64 if ( src->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) {
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65 SDL_VideoDevice *video = current_video;
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66 SDL_VideoDevice *this = current_video;
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67 if ( video->LockHWSurface(this, src) < 0 ) {
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68 okay = 0;
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69 } else {
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70 src_locked = 1;
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71 }
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72 }
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73
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74 /* Unencode the destination if it's RLE encoded */
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75 if ( dst->flags & SDL_RLEACCEL ) {
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76 SDL_UnRLESurface(dst, 1);
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77 dst->flags |= SDL_RLEACCEL; /* save accel'd state */
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78 }
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79
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80 /* Set up source and destination buffer pointers, and BLIT! */
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81 if ( okay && srcrect->w && srcrect->h ) {
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82 SDL_BlitInfo info;
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83 SDL_loblit RunBlit;
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84
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85 /* Set up the blit information */
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86 info.s_pixels = (Uint8 *)src->pixels + src->offset +
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87 (Uint16)srcrect->y*src->pitch +
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88 (Uint16)srcrect->x*src->format->BytesPerPixel;
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89 info.s_width = srcrect->w;
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90 info.s_height = srcrect->h;
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91 info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
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92 info.d_pixels = (Uint8 *)dst->pixels + dst->offset +
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93 (Uint16)dstrect->y*dst->pitch +
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94 (Uint16)dstrect->x*dst->format->BytesPerPixel;
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95 info.d_width = dstrect->w;
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96 info.d_height = dstrect->h;
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97 info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
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98 info.aux_data = src->map->sw_data->aux_data;
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99 info.src = src->format;
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100 info.table = src->map->table;
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101 info.dst = dst->format;
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102 RunBlit = src->map->sw_data->blit;
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103
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104 /* Run the actual software blit */
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105 RunBlit(&info);
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106 }
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107
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108 /* Re-encode the destination if it's RLE encoded */
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109 if ( dst->flags & SDL_RLEACCEL ) {
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110 dst->flags &= ~SDL_RLEACCEL; /* stop lying */
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111 SDL_RLESurface(dst);
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112 }
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113
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114 /* We need to unlock the surfaces if they're locked */
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115 if ( dst_locked ) {
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116 SDL_VideoDevice *video = current_video;
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117 SDL_VideoDevice *this = current_video;
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118 video->UnlockHWSurface(this, dst);
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119 } else
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120 if ( src_locked ) {
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121 SDL_VideoDevice *video = current_video;
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122 SDL_VideoDevice *this = current_video;
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123 video->UnlockHWSurface(this, src);
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124 }
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125 /* Blit is done! */
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126 return(okay ? 0 : -1);
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127 }
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128
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129 static void SDL_BlitCopy(SDL_BlitInfo *info)
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130 {
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131 Uint8 *src, *dst;
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132 int w, h;
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133 int srcskip, dstskip;
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134
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135 w = info->d_width*info->dst->BytesPerPixel;
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136 h = info->d_height;
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137 src = info->s_pixels;
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138 dst = info->d_pixels;
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139 srcskip = w+info->s_skip;
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140 dstskip = w+info->d_skip;
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141 while ( h-- ) {
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142 SDL_memcpy(dst, src, w);
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143 src += srcskip;
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144 dst += dstskip;
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145 }
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146 }
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147
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148 static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
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149 {
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150 Uint8 *src, *dst;
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151 int w, h;
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152 int srcskip, dstskip;
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153
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154 w = info->d_width*info->dst->BytesPerPixel;
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155 h = info->d_height;
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156 src = info->s_pixels;
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157 dst = info->d_pixels;
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158 srcskip = w+info->s_skip;
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159 dstskip = w+info->d_skip;
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160 if ( dst < src ) {
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161 while ( h-- ) {
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162 SDL_memcpy(dst, src, w);
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163 src += srcskip;
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164 dst += dstskip;
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165 }
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166 } else {
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167 src += ((h-1) * srcskip);
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168 dst += ((h-1) * dstskip);
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169 while ( h-- ) {
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170 SDL_revcpy(dst, src, w);
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171 src -= srcskip;
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172 dst -= dstskip;
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173 }
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174 }
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175 }
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176
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177 /* Figure out which of many blit routines to set up on a surface */
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178 int SDL_CalculateBlit(SDL_Surface *surface)
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179 {
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180 int blit_index;
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181
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182 /* Clean everything out to start */
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183 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
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184 SDL_UnRLESurface(surface, 1);
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185 }
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186 surface->map->sw_blit = NULL;
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187
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188 /* Figure out if an accelerated hardware blit is possible */
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189 surface->flags &= ~SDL_HWACCEL;
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190 if ( surface->map->identity ) {
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191 int hw_blit_ok;
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192
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193 if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
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194 /* We only support accelerated blitting to hardware */
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195 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
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196 hw_blit_ok = current_video->info.blit_hw;
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197 } else {
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198 hw_blit_ok = 0;
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199 }
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200 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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201 hw_blit_ok = current_video->info.blit_hw_CC;
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202 }
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203 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
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204 hw_blit_ok = current_video->info.blit_hw_A;
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205 }
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206 } else {
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207 /* We only support accelerated blitting to hardware */
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208 if ( surface->map->dst->flags & SDL_HWSURFACE ) {
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209 hw_blit_ok = current_video->info.blit_sw;
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210 } else {
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211 hw_blit_ok = 0;
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212 }
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213 if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
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214 hw_blit_ok = current_video->info.blit_sw_CC;
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215 }
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216 if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
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217 hw_blit_ok = current_video->info.blit_sw_A;
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218 }
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219 }
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220 if ( hw_blit_ok ) {
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221 SDL_VideoDevice *video = current_video;
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222 SDL_VideoDevice *this = current_video;
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223 video->CheckHWBlit(this, surface, surface->map->dst);
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224 }
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225 }
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226
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227 /* Get the blit function index, based on surface mode */
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228 /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
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229 blit_index = 0;
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230 blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
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231 if ( surface->flags & SDL_SRCALPHA
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232 && (surface->format->alpha != SDL_ALPHA_OPAQUE
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233 || surface->format->Amask) ) {
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234 blit_index |= 2;
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235 }
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236
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237 /* Check for special "identity" case -- copy blit */
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238 if ( surface->map->identity && blit_index == 0 ) {
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239 surface->map->sw_data->blit = SDL_BlitCopy;
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240
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241 /* Handle overlapping blits on the same surface */
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242 if ( surface == surface->map->dst ) {
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243 surface->map->sw_data->blit = SDL_BlitCopyOverlap;
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244 }
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245 } else {
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246 if ( surface->format->BitsPerPixel < 8 ) {
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247 surface->map->sw_data->blit =
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248 SDL_CalculateBlit0(surface, blit_index);
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249 } else {
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250 switch ( surface->format->BytesPerPixel ) {
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251 case 1:
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252 surface->map->sw_data->blit =
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253 SDL_CalculateBlit1(surface, blit_index);
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254 break;
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255 case 2:
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256 case 3:
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257 case 4:
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258 surface->map->sw_data->blit =
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259 SDL_CalculateBlitN(surface, blit_index);
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260 break;
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261 default:
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262 surface->map->sw_data->blit = NULL;
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263 break;
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264 }
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265 }
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266 }
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267 /* Make sure we have a blit function */
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268 if ( surface->map->sw_data->blit == NULL ) {
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269 SDL_InvalidateMap(surface->map);
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270 SDL_SetError("Blit combination not supported");
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271 return(-1);
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272 }
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273
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274 /* Choose software blitting function */
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275 if(surface->flags & SDL_RLEACCELOK
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276 && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
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277
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278 if(surface->map->identity
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279 && (blit_index == 1
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280 || (blit_index == 3 && !surface->format->Amask))) {
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281 if ( SDL_RLESurface(surface) == 0 )
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282 surface->map->sw_blit = SDL_RLEBlit;
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283 } else if(blit_index == 2 && surface->format->Amask) {
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284 if ( SDL_RLESurface(surface) == 0 )
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285 surface->map->sw_blit = SDL_RLEAlphaBlit;
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286 }
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287 }
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288
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289 if ( surface->map->sw_blit == NULL ) {
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290 surface->map->sw_blit = SDL_SoftBlit;
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291 }
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292 return(0);
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293 }
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294
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