annotate src/video/SDL_stretch.c @ 1402:d910939febfa

Use consistent identifiers for the various platforms we support. Make sure every source file includes SDL_config.h, so the proper system headers are chosen.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 21 Feb 2006 08:46:50 +0000
parents 19418e4422cb
children e3242177fe4a
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 /* 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(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES
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39 #define USE_ASM_STRETCH
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40 #endif
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41
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42 #ifdef USE_ASM_STRETCH
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43
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44 #if defined(_M_IX86) || defined(i386)
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45 #define PREFIX16 0x66
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46 #define STORE_BYTE 0xAA
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47 #define STORE_WORD 0xAB
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48 #define LOAD_BYTE 0xAC
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49 #define LOAD_WORD 0xAD
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50 #define RETURN 0xC3
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51 #else
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52 #error Need assembly opcodes for this architecture
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53 #endif
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54
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55 static unsigned char copy_row[4096];
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56
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57 static int generate_rowbytes(int src_w, int dst_w, int bpp)
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58 {
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59 static struct {
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60 int bpp;
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61 int src_w;
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62 int dst_w;
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63 } last;
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64
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65 int i;
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66 int pos, inc;
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67 unsigned char *eip;
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68 unsigned char load, store;
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69
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70 /* See if we need to regenerate the copy buffer */
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71 if ( (src_w == last.src_w) &&
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72 (dst_w == last.dst_w) && (bpp == last.bpp) ) {
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73 return(0);
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74 }
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75 last.bpp = bpp;
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76 last.src_w = src_w;
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77 last.dst_w = dst_w;
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78
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79 switch (bpp) {
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80 case 1:
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81 load = LOAD_BYTE;
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82 store = STORE_BYTE;
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83 break;
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84 case 2:
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85 case 4:
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86 load = LOAD_WORD;
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87 store = STORE_WORD;
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88 break;
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89 default:
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90 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
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91 return(-1);
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92 }
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93 pos = 0x10000;
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94 inc = (src_w << 16) / dst_w;
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95 eip = copy_row;
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96 for ( i=0; i<dst_w; ++i ) {
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97 while ( pos >= 0x10000L ) {
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98 if ( bpp == 2 ) {
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99 *eip++ = PREFIX16;
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100 }
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101 *eip++ = load;
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102 pos -= 0x10000L;
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103 }
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104 if ( bpp == 2 ) {
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105 *eip++ = PREFIX16;
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106 }
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107 *eip++ = store;
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108 pos += inc;
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109 }
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110 *eip++ = RETURN;
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111
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112 /* Verify that we didn't overflow (too late) */
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113 if ( eip > (copy_row+sizeof(copy_row)) ) {
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114 SDL_SetError("Copy buffer overflow");
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115 return(-1);
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116 }
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117 return(0);
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118 }
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119
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120 #else
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121
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122 #define DEFINE_COPY_ROW(name, type) \
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123 void name(type *src, int src_w, type *dst, int dst_w) \
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124 { \
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125 int i; \
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126 int pos, inc; \
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127 type pixel = 0; \
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128 \
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129 pos = 0x10000; \
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130 inc = (src_w << 16) / dst_w; \
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131 for ( i=dst_w; i>0; --i ) { \
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132 while ( pos >= 0x10000L ) { \
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133 pixel = *src++; \
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134 pos -= 0x10000L; \
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135 } \
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136 *dst++ = pixel; \
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137 pos += inc; \
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138 } \
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139 }
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140 DEFINE_COPY_ROW(copy_row1, Uint8)
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141 DEFINE_COPY_ROW(copy_row2, Uint16)
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142 DEFINE_COPY_ROW(copy_row4, Uint32)
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143
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144 #endif /* USE_ASM_STRETCH */
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145
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146 /* The ASM code doesn't handle 24-bpp stretch blits */
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147 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w)
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148 {
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149 int i;
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150 int pos, inc;
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151 Uint8 pixel[3];
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152
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153 pos = 0x10000;
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154 inc = (src_w << 16) / dst_w;
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155 for ( i=dst_w; i>0; --i ) {
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156 while ( pos >= 0x10000L ) {
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157 pixel[0] = *src++;
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158 pixel[1] = *src++;
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159 pixel[2] = *src++;
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160 pos -= 0x10000L;
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161 }
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162 *dst++ = pixel[0];
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163 *dst++ = pixel[1];
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164 *dst++ = pixel[2];
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165 pos += inc;
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166 }
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167 }
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168
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169 /* Perform a stretch blit between two surfaces of the same format.
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170 NOTE: This function is not safe to call from multiple threads!
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171 */
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172 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
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173 SDL_Surface *dst, SDL_Rect *dstrect)
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174 {
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175 int src_locked;
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176 int dst_locked;
0
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177 int pos, inc;
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178 int dst_width;
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179 int dst_maxrow;
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180 int src_row, dst_row;
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181 Uint8 *srcp = NULL;
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182 Uint8 *dstp;
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183 SDL_Rect full_src;
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184 SDL_Rect full_dst;
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185 #if defined(USE_ASM_STRETCH) && defined(__GNUC__)
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186 int u1, u2;
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187 #endif
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188 const int bpp = dst->format->BytesPerPixel;
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189
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190 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) {
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191 SDL_SetError("Only works with same format surfaces");
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192 return(-1);
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193 }
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194
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195 /* Verify the blit rectangles */
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196 if ( srcrect ) {
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197 if ( (srcrect->x < 0) || (srcrect->y < 0) ||
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198 ((srcrect->x+srcrect->w) > src->w) ||
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199 ((srcrect->y+srcrect->h) > src->h) ) {
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200 SDL_SetError("Invalid source blit rectangle");
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201 return(-1);
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202 }
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203 } else {
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204 full_src.x = 0;
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205 full_src.y = 0;
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206 full_src.w = src->w;
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207 full_src.h = src->h;
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208 srcrect = &full_src;
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209 }
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210 if ( dstrect ) {
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211 if ( (dstrect->x < 0) || (dstrect->y < 0) ||
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212 ((dstrect->x+dstrect->w) > dst->w) ||
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213 ((dstrect->y+dstrect->h) > dst->h) ) {
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214 SDL_SetError("Invalid destination blit rectangle");
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215 return(-1);
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216 }
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217 } else {
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218 full_dst.x = 0;
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219 full_dst.y = 0;
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220 full_dst.w = dst->w;
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221 full_dst.h = dst->h;
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222 dstrect = &full_dst;
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223 }
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224
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225 /* Lock the destination if it's in hardware */
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226 dst_locked = 0;
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227 if ( SDL_MUSTLOCK(dst) ) {
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228 if ( SDL_LockSurface(dst) < 0 ) {
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229 SDL_SetError("Unable to lock destination surface");
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230 return(-1);
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231 }
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232 dst_locked = 1;
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233 }
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234 /* Lock the source if it's in hardware */
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235 src_locked = 0;
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236 if ( SDL_MUSTLOCK(src) ) {
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237 if ( SDL_LockSurface(src) < 0 ) {
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238 if ( dst_locked ) {
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239 SDL_UnlockSurface(dst);
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240 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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241 SDL_SetError("Unable to lock source surface");
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242 return(-1);
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243 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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244 src_locked = 1;
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245 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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246
0
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247 /* Set up the data... */
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diff changeset
248 pos = 0x10000;
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249 inc = (srcrect->h << 16) / dstrect->h;
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250 src_row = srcrect->y;
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diff changeset
251 dst_row = dstrect->y;
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diff changeset
252 dst_width = dstrect->w*bpp;
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diff changeset
253
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diff changeset
254 #ifdef USE_ASM_STRETCH
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diff changeset
255 /* Write the opcodes for this stretch */
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parents:
diff changeset
256 if ( (bpp != 3) &&
74212992fb08 Initial revision
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diff changeset
257 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) {
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parents:
diff changeset
258 return(-1);
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parents:
diff changeset
259 }
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parents:
diff changeset
260 #endif
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parents:
diff changeset
261
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parents:
diff changeset
262 /* Perform the stretch blit */
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parents:
diff changeset
263 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) {
74212992fb08 Initial revision
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parents:
diff changeset
264 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch)
74212992fb08 Initial revision
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parents:
diff changeset
265 + (dstrect->x*bpp);
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parents:
diff changeset
266 while ( pos >= 0x10000L ) {
74212992fb08 Initial revision
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parents:
diff changeset
267 srcp = (Uint8 *)src->pixels + (src_row*src->pitch)
74212992fb08 Initial revision
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parents:
diff changeset
268 + (srcrect->x*bpp);
74212992fb08 Initial revision
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parents:
diff changeset
269 ++src_row;
74212992fb08 Initial revision
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parents:
diff changeset
270 pos -= 0x10000L;
74212992fb08 Initial revision
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parents:
diff changeset
271 }
74212992fb08 Initial revision
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parents:
diff changeset
272 #ifdef USE_ASM_STRETCH
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parents:
diff changeset
273 switch (bpp) {
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parents:
diff changeset
274 case 3:
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parents:
diff changeset
275 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
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parents:
diff changeset
276 break;
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parents:
diff changeset
277 default:
74212992fb08 Initial revision
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diff changeset
278 #ifdef __GNUC__
627
8b9ac38381d0 Fixed compile problem in SDL_stretch.c with gcc 3.3
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
279 __asm__ __volatile__ (
1228
f4a3a4129d04 From Mike Frysinger and/or Gentoo:
Ryan C. Gordon <icculus@icculus.org>
parents: 1164
diff changeset
280 "call *%4"
0
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parents:
diff changeset
281 : "=&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
diff changeset
282 : "0" (dstp), "1" (srcp), "r" (copy_row)
0
74212992fb08 Initial revision
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parents:
diff changeset
283 : "memory" );
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parents:
diff changeset
284 #else
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
Sam Lantinga <slouken@libsdl.org>
parents: 1358
diff changeset
285 #ifdef _MSC_VER
1234
73676c1f56ee For sanity's sake, removed the '&' when passing copy_row array to asm.
Ryan C. Gordon <icculus@icculus.org>
parents: 1233
diff changeset
286 { void *code = copy_row;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 __asm {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 push edi
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 push esi
74212992fb08 Initial revision
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parents:
diff changeset
290
74212992fb08 Initial revision
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parents:
diff changeset
291 mov edi, dstp
74212992fb08 Initial revision
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parents:
diff changeset
292 mov esi, srcp
74212992fb08 Initial revision
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parents:
diff changeset
293 call dword ptr code
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 pop esi
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 pop edi
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 }
74212992fb08 Initial revision
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parents:
diff changeset
298 }
74212992fb08 Initial revision
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parents:
diff changeset
299 #else
74212992fb08 Initial revision
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parents:
diff changeset
300 #error Need inline assembly for this compiler
74212992fb08 Initial revision
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parents:
diff changeset
301 #endif
74212992fb08 Initial revision
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parents:
diff changeset
302 #endif /* __GNUC__ */
74212992fb08 Initial revision
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parents:
diff changeset
303 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 #else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 switch (bpp) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 copy_row1(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 break;
74212992fb08 Initial revision
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parents:
diff changeset
310 case 2:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 copy_row2((Uint16 *)srcp, srcrect->w,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 (Uint16 *)dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 case 3:
74212992fb08 Initial revision
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parents:
diff changeset
315 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 case 4:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 copy_row4((Uint32 *)srcp, srcrect->w,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 (Uint32 *)dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 pos += inc;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
325
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
326 /* 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
diff changeset
327 if ( dst_locked ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
328 SDL_UnlockSurface(dst);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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329 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
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330 if ( src_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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331 SDL_UnlockSurface(src);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
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332 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
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333 return(0);
74212992fb08 Initial revision
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parents:
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334 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
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335