annotate src/video/SDL_stretch.c @ 1747:e75d0cbcf3c8

(none)
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Apr 2006 17:56:06 +0000
parents e3242177fe4a
children 782fd950bd46 b5a4ac87b98c
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(__WATCOMC__) || \
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39 (defined(__GNUC__) && defined(__i386__))) && SDL_ASSEMBLY_ROUTINES
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40 #define USE_ASM_STRETCH
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41 #endif
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42
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43 #ifdef USE_ASM_STRETCH
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44
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45 #if defined(_M_IX86) || defined(i386)
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46 #define PREFIX16 0x66
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47 #define STORE_BYTE 0xAA
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48 #define STORE_WORD 0xAB
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49 #define LOAD_BYTE 0xAC
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50 #define LOAD_WORD 0xAD
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51 #define RETURN 0xC3
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52 #else
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53 #error Need assembly opcodes for this architecture
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54 #endif
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55
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56 static unsigned char copy_row[4096];
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57
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58 static int generate_rowbytes(int src_w, int dst_w, int bpp)
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59 {
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60 static struct {
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61 int bpp;
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62 int src_w;
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63 int dst_w;
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64 } last;
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65
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66 int i;
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67 int pos, inc;
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68 unsigned char *eip;
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69 unsigned char load, store;
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70
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71 /* See if we need to regenerate the copy buffer */
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72 if ( (src_w == last.src_w) &&
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73 (dst_w == last.dst_w) && (bpp == last.bpp) ) {
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74 return(0);
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75 }
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76 last.bpp = bpp;
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77 last.src_w = src_w;
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78 last.dst_w = dst_w;
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79
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80 switch (bpp) {
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81 case 1:
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82 load = LOAD_BYTE;
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83 store = STORE_BYTE;
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84 break;
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85 case 2:
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86 case 4:
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87 load = LOAD_WORD;
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88 store = STORE_WORD;
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89 break;
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90 default:
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91 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
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92 return(-1);
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93 }
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94 pos = 0x10000;
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95 inc = (src_w << 16) / dst_w;
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96 eip = copy_row;
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97 for ( i=0; i<dst_w; ++i ) {
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98 while ( pos >= 0x10000L ) {
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99 if ( bpp == 2 ) {
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100 *eip++ = PREFIX16;
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101 }
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102 *eip++ = load;
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103 pos -= 0x10000L;
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104 }
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105 if ( bpp == 2 ) {
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106 *eip++ = PREFIX16;
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107 }
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108 *eip++ = store;
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109 pos += inc;
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110 }
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111 *eip++ = RETURN;
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112
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113 /* Verify that we didn't overflow (too late) */
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114 if ( eip > (copy_row+sizeof(copy_row)) ) {
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115 SDL_SetError("Copy buffer overflow");
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116 return(-1);
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117 }
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118 return(0);
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119 }
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120
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121 #else
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122
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123 #define DEFINE_COPY_ROW(name, type) \
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124 void name(type *src, int src_w, type *dst, int dst_w) \
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125 { \
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126 int i; \
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127 int pos, inc; \
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128 type pixel = 0; \
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129 \
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130 pos = 0x10000; \
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131 inc = (src_w << 16) / dst_w; \
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132 for ( i=dst_w; i>0; --i ) { \
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133 while ( pos >= 0x10000L ) { \
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134 pixel = *src++; \
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135 pos -= 0x10000L; \
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136 } \
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137 *dst++ = pixel; \
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138 pos += inc; \
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139 } \
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140 }
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141 DEFINE_COPY_ROW(copy_row1, Uint8)
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142 DEFINE_COPY_ROW(copy_row2, Uint16)
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143 DEFINE_COPY_ROW(copy_row4, Uint32)
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144
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145 #endif /* USE_ASM_STRETCH */
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146
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147 /* The ASM code doesn't handle 24-bpp stretch blits */
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148 void copy_row3(Uint8 *src, int src_w, Uint8 *dst, int dst_w)
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149 {
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150 int i;
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151 int pos, inc;
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152 Uint8 pixel[3];
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153
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154 pos = 0x10000;
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155 inc = (src_w << 16) / dst_w;
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156 for ( i=dst_w; i>0; --i ) {
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157 while ( pos >= 0x10000L ) {
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158 pixel[0] = *src++;
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159 pixel[1] = *src++;
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160 pixel[2] = *src++;
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161 pos -= 0x10000L;
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162 }
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163 *dst++ = pixel[0];
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164 *dst++ = pixel[1];
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165 *dst++ = pixel[2];
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166 pos += inc;
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167 }
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168 }
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169
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170 /* Perform a stretch blit between two surfaces of the same format.
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171 NOTE: This function is not safe to call from multiple threads!
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172 */
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173 int SDL_SoftStretch(SDL_Surface *src, SDL_Rect *srcrect,
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174 SDL_Surface *dst, SDL_Rect *dstrect)
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175 {
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176 int src_locked;
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177 int dst_locked;
0
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178 int pos, inc;
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179 int dst_width;
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180 int dst_maxrow;
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181 int src_row, dst_row;
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182 Uint8 *srcp = NULL;
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183 Uint8 *dstp;
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184 SDL_Rect full_src;
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185 SDL_Rect full_dst;
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186 #if defined(USE_ASM_STRETCH) && defined(__GNUC__)
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187 int u1, u2;
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188 #endif
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189 const int bpp = dst->format->BytesPerPixel;
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190
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191 if ( src->format->BitsPerPixel != dst->format->BitsPerPixel ) {
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192 SDL_SetError("Only works with same format surfaces");
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193 return(-1);
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194 }
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195
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parents:
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196 /* Verify the blit rectangles */
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parents:
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197 if ( srcrect ) {
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198 if ( (srcrect->x < 0) || (srcrect->y < 0) ||
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199 ((srcrect->x+srcrect->w) > src->w) ||
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200 ((srcrect->y+srcrect->h) > src->h) ) {
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201 SDL_SetError("Invalid source blit rectangle");
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202 return(-1);
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diff changeset
203 }
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204 } else {
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205 full_src.x = 0;
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206 full_src.y = 0;
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207 full_src.w = src->w;
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208 full_src.h = src->h;
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209 srcrect = &full_src;
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210 }
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211 if ( dstrect ) {
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212 if ( (dstrect->x < 0) || (dstrect->y < 0) ||
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213 ((dstrect->x+dstrect->w) > dst->w) ||
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214 ((dstrect->y+dstrect->h) > dst->h) ) {
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215 SDL_SetError("Invalid destination blit rectangle");
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216 return(-1);
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parents:
diff changeset
217 }
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218 } else {
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219 full_dst.x = 0;
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220 full_dst.y = 0;
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221 full_dst.w = dst->w;
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222 full_dst.h = dst->h;
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223 dstrect = &full_dst;
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diff changeset
224 }
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225
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226 /* Lock the destination if it's in hardware */
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227 dst_locked = 0;
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228 if ( SDL_MUSTLOCK(dst) ) {
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229 if ( SDL_LockSurface(dst) < 0 ) {
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230 SDL_SetError("Unable to lock destination surface");
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231 return(-1);
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diff changeset
232 }
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233 dst_locked = 1;
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234 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
235 /* Lock the source if it's in hardware */
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236 src_locked = 0;
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237 if ( SDL_MUSTLOCK(src) ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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238 if ( SDL_LockSurface(src) < 0 ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
239 if ( dst_locked ) {
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diff changeset
240 SDL_UnlockSurface(dst);
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241 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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diff changeset
242 SDL_SetError("Unable to lock source surface");
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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diff changeset
243 return(-1);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
244 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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diff changeset
245 src_locked = 1;
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
246 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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diff changeset
247
0
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parents:
diff changeset
248 /* Set up the data... */
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diff changeset
249 pos = 0x10000;
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diff changeset
250 inc = (srcrect->h << 16) / dstrect->h;
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parents:
diff changeset
251 src_row = srcrect->y;
74212992fb08 Initial revision
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parents:
diff changeset
252 dst_row = dstrect->y;
74212992fb08 Initial revision
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diff changeset
253 dst_width = dstrect->w*bpp;
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parents:
diff changeset
254
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diff changeset
255 #ifdef USE_ASM_STRETCH
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parents:
diff changeset
256 /* Write the opcodes for this stretch */
74212992fb08 Initial revision
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parents:
diff changeset
257 if ( (bpp != 3) &&
74212992fb08 Initial revision
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diff changeset
258 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) {
74212992fb08 Initial revision
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parents:
diff changeset
259 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 #endif
74212992fb08 Initial revision
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parents:
diff changeset
262
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parents:
diff changeset
263 /* Perform the stretch blit */
74212992fb08 Initial revision
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parents:
diff changeset
264 for ( dst_maxrow = dst_row+dstrect->h; dst_row<dst_maxrow; ++dst_row ) {
74212992fb08 Initial revision
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parents:
diff changeset
265 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch)
74212992fb08 Initial revision
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parents:
diff changeset
266 + (dstrect->x*bpp);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 while ( pos >= 0x10000L ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 srcp = (Uint8 *)src->pixels + (src_row*src->pitch)
74212992fb08 Initial revision
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parents:
diff changeset
269 + (srcrect->x*bpp);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 ++src_row;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 pos -= 0x10000L;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 #ifdef USE_ASM_STRETCH
74212992fb08 Initial revision
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parents:
diff changeset
274 switch (bpp) {
74212992fb08 Initial revision
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parents:
diff changeset
275 case 3:
74212992fb08 Initial revision
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parents:
diff changeset
276 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
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parents:
diff changeset
277 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 default:
74212992fb08 Initial revision
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parents:
diff changeset
279 #ifdef __GNUC__
627
8b9ac38381d0 Fixed compile problem in SDL_stretch.c with gcc 3.3
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
280 __asm__ __volatile__ (
1228
f4a3a4129d04 From Mike Frysinger and/or Gentoo:
Ryan C. Gordon <icculus@icculus.org>
parents: 1164
diff changeset
281 "call *%4"
0
74212992fb08 Initial revision
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parents:
diff changeset
282 : "=&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
283 : "0" (dstp), "1" (srcp), "r" (copy_row)
0
74212992fb08 Initial revision
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parents:
diff changeset
284 : "memory" );
1442
e3242177fe4a Updated OS/2 build, yay!
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
285 #elif defined(_MSC_VER) || defined(__WATCOMC__)
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
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290
74212992fb08 Initial revision
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parents:
diff changeset
291 mov edi, dstp
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 mov esi, srcp
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 #else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 switch (bpp) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 case 1:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 copy_row1(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 case 2:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 copy_row2((Uint16 *)srcp, srcrect->w,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 (Uint16 *)dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 case 3:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 case 4:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 copy_row4((Uint32 *)srcp, srcrect->w,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 (Uint32 *)dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 pos += inc;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
324
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
325 /* 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
326 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
327 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
328 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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329 if ( src_locked ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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330 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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331 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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332 return(0);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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333 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
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334