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annotate src/video/SDL_stretch.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents b5a4ac87b98c
children 8055185ae4ed
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
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59 generate_rowbytes(int src_w, int dst_w, int bpp)
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60 {
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61 static struct
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62 {
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63 int bpp;
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64 int src_w;
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65 int dst_w;
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66 } last;
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67
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68 int i;
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69 int pos, inc;
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70 unsigned char *eip;
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71 unsigned char load, store;
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72
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73 /* See if we need to regenerate the copy buffer */
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74 if ((src_w == last.src_w) && (dst_w == last.dst_w) && (bpp == last.bpp)) {
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75 return (0);
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76 }
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77 last.bpp = bpp;
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78 last.src_w = src_w;
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79 last.dst_w = dst_w;
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80
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81 switch (bpp) {
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82 case 1:
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83 load = LOAD_BYTE;
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84 store = STORE_BYTE;
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85 break;
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86 case 2:
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87 case 4:
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88 load = LOAD_WORD;
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89 store = STORE_WORD;
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90 break;
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91 default:
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92 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
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93 return (-1);
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94 }
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95 pos = 0x10000;
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96 inc = (src_w << 16) / dst_w;
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97 eip = copy_row;
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98 for (i = 0; i < dst_w; ++i) {
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99 while (pos >= 0x10000L) {
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100 if (bpp == 2) {
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101 *eip++ = PREFIX16;
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102 }
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103 *eip++ = load;
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104 pos -= 0x10000L;
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105 }
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106 if (bpp == 2) {
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107 *eip++ = PREFIX16;
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108 }
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109 *eip++ = store;
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110 pos += inc;
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111 }
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112 *eip++ = RETURN;
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113
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114 /* Verify that we didn't overflow (too late) */
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115 if (eip > (copy_row + sizeof(copy_row))) {
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116 SDL_SetError("Copy buffer overflow");
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117 return (-1);
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118 }
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119 return (0);
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120 }
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121
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122 #else
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123
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124 #define DEFINE_COPY_ROW(name, type) \
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125 void name(type *src, int src_w, type *dst, int dst_w) \
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126 { \
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127 int i; \
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128 int pos, inc; \
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129 type pixel = 0; \
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130 \
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131 pos = 0x10000; \
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132 inc = (src_w << 16) / dst_w; \
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133 for ( i=dst_w; i>0; --i ) { \
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134 while ( pos >= 0x10000L ) { \
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135 pixel = *src++; \
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136 pos -= 0x10000L; \
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137 } \
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138 *dst++ = pixel; \
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139 pos += inc; \
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140 } \
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141 }
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142 DEFINE_COPY_ROW(copy_row1, Uint8)
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143 DEFINE_COPY_ROW(copy_row2, Uint16) DEFINE_COPY_ROW(copy_row4, Uint32)
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144 #endif /* USE_ASM_STRETCH */
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145 /* The ASM code doesn't handle 24-bpp stretch blits */
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146 void
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147 copy_row3(Uint8 * src, int src_w, Uint8 * dst, int dst_w)
0
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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
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173 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;
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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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196 /* Verify the blit rectangles */
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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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203 }
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204 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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) ||
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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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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;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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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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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232 }
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233 dst_locked = 1;
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234 }
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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)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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238 if (SDL_LockSurface(src) < 0) {
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239 if (dst_locked) {
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240 SDL_UnlockSurface(dst);
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241 }
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242 SDL_SetError("Unable to lock source surface");
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243 return (-1);
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244 }
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245 src_locked = 1;
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246 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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247
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248 /* Set up the data... */
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249 pos = 0x10000;
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250 inc = (srcrect->h << 16) / dstrect->h;
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251 src_row = srcrect->y;
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252 dst_row = dstrect->y;
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253 dst_width = dstrect->w * bpp;
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diff changeset
254
74212992fb08 Initial revision
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255 #ifdef USE_ASM_STRETCH
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diff changeset
256 /* Write the opcodes for this stretch */
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diff changeset
257 if ((bpp != 3) && (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
258 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
259 }
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diff changeset
260 #endif
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261
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262 /* Perform the stretch blit */
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diff changeset
263 for (dst_maxrow = dst_row + dstrect->h; dst_row < dst_maxrow; ++dst_row) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
264 dstp = (Uint8 *) dst->pixels + (dst_row * dst->pitch)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
265 + (dstrect->x * bpp);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
266 while (pos >= 0x10000L) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
267 srcp = (Uint8 *) src->pixels + (src_row * src->pitch)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
268 + (srcrect->x * bpp);
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diff changeset
269 ++src_row;
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diff changeset
270 pos -= 0x10000L;
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271 }
0
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272 #ifdef USE_ASM_STRETCH
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273 switch (bpp) {
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274 case 3:
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275 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
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276 break;
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277 default:
0
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278 #ifdef __GNUC__
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279 __asm__ __volatile__("call *%4": "=&D"(u1), "=&S"(u2): "0"(dstp), "1"(srcp), "r"(copy_row):"memory");
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e3242177fe4a Updated OS/2 build, yay!
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280 #elif defined(_MSC_VER) || defined(__WATCOMC__)
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281 {
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282 void *code = copy_row;
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283 __asm {
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284 push edi
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285 push esi
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286 mov edi, dstp
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287 mov esi, srcp call dword ptr code pop esi pop edi}
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288 }
0
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289 #else
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290 #error Need inline assembly for this compiler
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291 #endif
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292 break;
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293 }
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294 #else
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295 switch (bpp) {
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296 case 1:
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297 copy_row1(srcp, srcrect->w, dstp, dstrect->w);
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298 break;
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299 case 2:
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300 copy_row2((Uint16 *) srcp, srcrect->w,
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301 (Uint16 *) dstp, dstrect->w);
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302 break;
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303 case 3:
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304 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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305 break;
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306 case 4:
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307 copy_row4((Uint32 *) srcp, srcrect->w,
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308 (Uint32 *) dstp, dstrect->w);
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309 break;
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310 }
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311 #endif
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312 pos += inc;
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313 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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314
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315 /* We need to unlock the surfaces if they're locked */
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316 if (dst_locked) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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317 SDL_UnlockSurface(dst);
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318 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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319 if (src_locked) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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320 SDL_UnlockSurface(src);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
321 }
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322 return (0);
0
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323 }
74212992fb08 Initial revision
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324
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325 /* vi: set ts=4 sw=4 expandtab: */