annotate src/video/SDL_stretch.c @ 4543:d7cdc25af9a2 SDL-1.2

Better fix for bug 936
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jul 2010 10:28:57 -0700
parents abb56f7699ea
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 /* This a stretch blit implementation based on ideas given to me by
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25 Tomasz Cejner - thanks! :)
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26
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27 April 27, 2000 - Sam Lantinga
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28 */
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29
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30 #include "SDL_video.h"
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31 #include "SDL_blit.h"
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32
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33 /* This isn't ready for general consumption yet - it should be folded
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34 into the general blitting mechanism.
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35 */
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36
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37 #if ((defined(_MFC_VER) && defined(_M_IX86)/* && !defined(_WIN32_WCE) still needed? */) || \
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38 defined(__WATCOMC__) || \
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39 (defined(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES
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40 /* There's a bug with gcc 4.4.1 and -O2 where srcp doesn't get the correct
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41 * value after the first scanline. FIXME? */
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42 /*#define USE_ASM_STRETCH*/
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43 #endif
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44
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45 #ifdef USE_ASM_STRETCH
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46
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47 #ifdef HAVE_MPROTECT
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48 #include <sys/types.h>
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49 #include <sys/mman.h>
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50 #endif
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51 #ifdef __GNUC__
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52 #define PAGE_ALIGNED __attribute__((__aligned__(4096)))
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53 #else
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54 #define PAGE_ALIGNED
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55 #endif
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56
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57 #if defined(_M_IX86) || defined(i386)
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58 #define PREFIX16 0x66
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59 #define STORE_BYTE 0xAA
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60 #define STORE_WORD 0xAB
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61 #define LOAD_BYTE 0xAC
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62 #define LOAD_WORD 0xAD
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63 #define RETURN 0xC3
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64 #else
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65 #error Need assembly opcodes for this architecture
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66 #endif
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67
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68 static unsigned char copy_row[4096] PAGE_ALIGNED;
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69
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70 static int generate_rowbytes(int src_w, int dst_w, int bpp)
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71 {
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72 static struct {
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73 int bpp;
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74 int src_w;
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75 int dst_w;
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76 int status;
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77 } last;
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78
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79 int i;
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80 int pos, inc;
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81 unsigned char *eip, *fence;
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82 unsigned char load, store;
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83
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84 /* See if we need to regenerate the copy buffer */
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85 if ( (src_w == last.src_w) &&
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86 (dst_w == last.dst_w) && (bpp == last.bpp) ) {
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87 return(last.status);
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88 }
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89 last.bpp = bpp;
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90 last.src_w = src_w;
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91 last.dst_w = dst_w;
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92 last.status = -1;
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93
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94 switch (bpp) {
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95 case 1:
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96 load = LOAD_BYTE;
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97 store = STORE_BYTE;
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98 break;
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99 case 2:
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100 case 4:
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101 load = LOAD_WORD;
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102 store = STORE_WORD;
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103 break;
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104 default:
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105 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
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106 return(-1);
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107 }
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108 #ifdef HAVE_MPROTECT
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109 /* Make the code writeable */
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110 if ( mprotect(copy_row, sizeof(copy_row), PROT_READ|PROT_WRITE) < 0 ) {
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111 SDL_SetError("Couldn't make copy buffer writeable");
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112 return(-1);
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113 }
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114 #endif
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115 pos = 0x10000;
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116 inc = (src_w << 16) / dst_w;
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117 eip = copy_row;
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118 fence = copy_row+sizeof(copy_row)-2;
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119 for ( i=0; i<dst_w && eip < end; ++i ) {
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120 while ( pos >= 0x10000L ) {
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121 if ( eip == fence ) {
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122 return -1;
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123 }
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124 if ( bpp == 2 ) {
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125 *eip++ = PREFIX16;
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126 }
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127 *eip++ = load;
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128 pos -= 0x10000L;
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129 }
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130 if ( eip == fence ) {
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131 return -1;
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132 }
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133 if ( bpp == 2 ) {
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134 *eip++ = PREFIX16;
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135 }
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136 *eip++ = store;
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137 pos += inc;
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138 }
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139 *eip++ = RETURN;
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140
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141 #ifdef HAVE_MPROTECT
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142 /* Make the code executable but not writeable */
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143 if ( mprotect(copy_row, sizeof(copy_row), PROT_READ|PROT_EXEC) < 0 ) {
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144 SDL_SetError("Couldn't make copy buffer executable");
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145 return(-1);
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146 }
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147 #endif
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148 last.status = 0;
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149 return(0);
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150 }
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151
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152 #endif /* USE_ASM_STRETCH */
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153
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154 #define DEFINE_COPY_ROW(name, type) \
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155 void name(type *src, int src_w, type *dst, int dst_w) \
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156 { \
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157 int i; \
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158 int pos, inc; \
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159 type pixel = 0; \
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160 \
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161 pos = 0x10000; \
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162 inc = (src_w << 16) / dst_w; \
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163 for ( i=dst_w; i>0; --i ) { \
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164 while ( pos >= 0x10000L ) { \
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165 pixel = *src++; \
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166 pos -= 0x10000L; \
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167 } \
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168 *dst++ = pixel; \
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169 pos += inc; \
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170 } \
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171 }
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172 DEFINE_COPY_ROW(copy_row1, Uint8)
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173 DEFINE_COPY_ROW(copy_row2, Uint16)
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174 DEFINE_COPY_ROW(copy_row4, Uint32)
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175
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176 /* The ASM code doesn't handle 24-bpp stretch blits */
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177 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w)
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178 {
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179 int i;
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180 int pos, inc;
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181 Uint8 pixel[3] = { 0, 0, 0 };
0
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182
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183 pos = 0x10000;
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184 inc = (src_w << 16) / dst_w;
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185 for ( i=dst_w; i>0; --i ) {
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186 while ( pos >= 0x10000L ) {
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187 pixel[0] = *src++;
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188 pixel[1] = *src++;
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189 pixel[2] = *src++;
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190 pos -= 0x10000L;
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191 }
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192 *dst++ = pixel[0];
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193 *dst++ = pixel[1];
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194 *dst++ = pixel[2];
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195 pos += inc;
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196 }
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197 }
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198
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199 /* Perform a stretch blit between two surfaces of the same format.
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200 NOTE: This function is not safe to call from multiple threads!
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201 */
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202 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
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203 SDL_Surface *dst, SDL_Rect *dstrect)
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204 {
894
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205 int src_locked;
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206 int dst_locked;
0
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207 int pos, inc;
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208 int dst_width;
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209 int dst_maxrow;
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210 int src_row, dst_row;
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211 Uint8 *srcp = NULL;
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212 Uint8 *dstp;
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213 SDL_Rect full_src;
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214 SDL_Rect full_dst;
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215 #ifdef USE_ASM_STRETCH
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216 SDL_bool use_asm = SDL_TRUE;
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217 #ifdef __GNUC__
0
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218 int u1, u2;
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219 #endif
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220 #endif /* USE_ASM_STRETCH */
0
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221 const int bpp = dst->format->BytesPerPixel;
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222
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223 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) {
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224 SDL_SetError("Only works with same format surfaces");
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225 return(-1);
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226 }
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227
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228 /* Verify the blit rectangles */
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229 if ( srcrect ) {
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230 if ( (srcrect->x < 0) || (srcrect->y < 0) ||
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231 ((srcrect->x+srcrect->w) > src->w) ||
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232 ((srcrect->y+srcrect->h) > src->h) ) {
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233 SDL_SetError("Invalid source blit rectangle");
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234 return(-1);
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235 }
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236 } else {
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237 full_src.x = 0;
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238 full_src.y = 0;
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239 full_src.w = src->w;
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240 full_src.h = src->h;
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241 srcrect = &full_src;
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242 }
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243 if ( dstrect ) {
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244 if ( (dstrect->x < 0) || (dstrect->y < 0) ||
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245 ((dstrect->x+dstrect->w) > dst->w) ||
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246 ((dstrect->y+dstrect->h) > dst->h) ) {
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247 SDL_SetError("Invalid destination blit rectangle");
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248 return(-1);
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249 }
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250 } else {
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251 full_dst.x = 0;
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252 full_dst.y = 0;
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253 full_dst.w = dst->w;
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254 full_dst.h = dst->h;
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255 dstrect = &full_dst;
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256 }
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257
894
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258 /* Lock the destination if it's in hardware */
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259 dst_locked = 0;
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260 if ( SDL_MUSTLOCK(dst) ) {
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diff changeset
261 if ( SDL_LockSurface(dst) < 0 ) {
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diff changeset
262 SDL_SetError("Unable to lock destination surface");
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263 return(-1);
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diff changeset
264 }
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diff changeset
265 dst_locked = 1;
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266 }
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267 /* Lock the source if it's in hardware */
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268 src_locked = 0;
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diff changeset
269 if ( SDL_MUSTLOCK(src) ) {
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diff changeset
270 if ( SDL_LockSurface(src) < 0 ) {
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diff changeset
271 if ( dst_locked ) {
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diff changeset
272 SDL_UnlockSurface(dst);
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273 }
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diff changeset
274 SDL_SetError("Unable to lock source surface");
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275 return(-1);
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diff changeset
276 }
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277 src_locked = 1;
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278 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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279
0
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diff changeset
280 /* Set up the data... */
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diff changeset
281 pos = 0x10000;
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diff changeset
282 inc = (srcrect->h << 16) / dstrect->h;
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diff changeset
283 src_row = srcrect->y;
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diff changeset
284 dst_row = dstrect->y;
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diff changeset
285 dst_width = dstrect->w*bpp;
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diff changeset
286
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diff changeset
287 #ifdef USE_ASM_STRETCH
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288 /* Write the opcodes for this stretch */
4109
cd2ab40f1219 Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
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diff changeset
289 if ( (bpp == 3) ||
0
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diff changeset
290 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) {
4109
cd2ab40f1219 Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
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parents: 4108
diff changeset
291 use_asm = SDL_FALSE;
0
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diff changeset
292 }
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diff changeset
293 #endif
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diff changeset
294
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diff changeset
295 /* Perform the stretch blit */
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diff changeset
296 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) {
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diff changeset
297 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch)
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diff changeset
298 + (dstrect->x*bpp);
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diff changeset
299 while ( pos >= 0x10000L ) {
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diff changeset
300 srcp = (Uint8 *)src->pixels + (src_row*src->pitch)
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parents:
diff changeset
301 + (srcrect->x*bpp);
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parents:
diff changeset
302 ++src_row;
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diff changeset
303 pos -= 0x10000L;
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diff changeset
304 }
74212992fb08 Initial revision
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diff changeset
305 #ifdef USE_ASM_STRETCH
4109
cd2ab40f1219 Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
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diff changeset
306 if (use_asm) {
0
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diff changeset
307 #ifdef __GNUC__
627
8b9ac38381d0 Fixed compile problem in SDL_stretch.c with gcc 3.3
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
308 __asm__ __volatile__ (
1228
f4a3a4129d04 From Mike Frysinger and/or Gentoo:
Ryan C. Gordon <icculus@icculus.org>
parents: 1164
diff changeset
309 "call *%4"
0
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diff changeset
310 : "=&D" (u1), "=&S" (u2)
1234
73676c1f56ee For sanity's sake, removed the '&' when passing copy_row array to asm.
Ryan C. Gordon <icculus@icculus.org>
parents: 1233
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311 : "0" (dstp), "1" (srcp), "r" (copy_row)
0
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312 : "memory" );
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e3242177fe4a Updated OS/2 build, yay!
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parents: 1402
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313 #elif defined(_MSC_VER) || defined(__WATCOMC__)
1234
73676c1f56ee For sanity's sake, removed the '&' when passing copy_row array to asm.
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parents: 1233
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314 { void *code = copy_row;
0
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315 __asm {
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316 push edi
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317 push esi
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318
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319 mov edi, dstp
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320 mov esi, srcp
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321 call dword ptr code
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322
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323 pop esi
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324 pop edi
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325 }
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326 }
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327 #else
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328 #error Need inline assembly for this compiler
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329 #endif
4109
cd2ab40f1219 Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents: 4108
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330 } else
cd2ab40f1219 Made the mprotect() fix for SDL_SoftStretch() more general for hardened linux, etc.
Sam Lantinga <slouken@libsdl.org>
parents: 4108
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331 #endif
0
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332 switch (bpp) {
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333 case 1:
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334 copy_row1(srcp, srcrect->w, dstp, dstrect->w);
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335 break;
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336 case 2:
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337 copy_row2((Uint16 *)srcp, srcrect->w,
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338 (Uint16 *)dstp, dstrect->w);
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339 break;
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340 case 3:
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341 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
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342 break;
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343 case 4:
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344 copy_row4((Uint32 *)srcp, srcrect->w,
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345 (Uint32 *)dstp, dstrect->w);
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346 break;
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347 }
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348 pos += inc;
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349 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
350
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
351 /* We need to unlock the surfaces if they're locked */
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
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352 if ( dst_locked ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
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353 SDL_UnlockSurface(dst);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
354 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
355 if ( src_locked ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
356 SDL_UnlockSurface(src);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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diff changeset
357 }
0
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parents:
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358 return(0);
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parents:
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359 }
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parents:
diff changeset
360