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annotate src/video/SDL_stretch.c @ 4425:a3e71b957215

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Fixed bug #961 Kalle Olavi Niemitalo 2010-02-28 09:15:50 PST It seems the SDLK_LMETA and SDLK_RMETA constants have been removed from SDL 1.3. I grepped for them in the SDL source tree and these were the only hits: ./include/SDL_compat.h:230:#define SDLK_LSUPER SDLK_LMETA ./include/SDL_compat.h:231:#define SDLK_RSUPER SDLK_RMETA ./src/video/bwindow/SDL_BWin.h:194: keymap[0x66] = SDLK_LMETA; ./src/video/bwindow/SDL_BWin.h:195: keymap[0x67] = SDLK_RMETA; I don't know how compatible SDL 1.3 is supposed to be with applications designed for SDL 1.2. However, as you can see, SDL itself is still trying to use the removed constants, and that is clearly a bug. Because SDL_compat.h defines KMOD_LMETA as KMOD_LGUI, I suppose it should also define SDLK_LMETA as SDLK_LGUI, and SDLK_RMETA likewise.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 09 Mar 2010 06:07:48 +0000
parents f7b03b6838cb
children 791b3256fb22
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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
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71 generate_rowbytes(int src_w, int dst_w, int bpp)
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72 {
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73 static struct
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74 {
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75 int bpp;
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76 int src_w;
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77 int dst_w;
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78 int status;
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79 } last;
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80
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81 int i;
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82 int pos, inc;
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83 unsigned char *eip;
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84 unsigned char load, store;
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85
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86 /* See if we need to regenerate the copy buffer */
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87 if ((src_w == last.src_w) && (dst_w == last.dst_w) && (bpp == last.bpp)) {
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88 return (last.status);
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89 }
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90 last.bpp = bpp;
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91 last.src_w = src_w;
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92 last.dst_w = dst_w;
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93 last.status = -1;
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94
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95 switch (bpp) {
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96 case 1:
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97 load = LOAD_BYTE;
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98 store = STORE_BYTE;
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99 break;
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100 case 2:
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101 case 4:
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102 load = LOAD_WORD;
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103 store = STORE_WORD;
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104 break;
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105 default:
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106 SDL_SetError("ASM stretch of %d bytes isn't supported\n", bpp);
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107 return (-1);
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108 }
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109 #ifdef HAVE_MPROTECT
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110 /* Make the code writeable */
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111 if (mprotect(copy_row, sizeof(copy_row), PROT_READ | PROT_WRITE) < 0) {
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112 SDL_SetError("Couldn't make copy buffer writeable");
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113 return (-1);
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114 }
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115 #endif
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116 pos = 0x10000;
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117 inc = (src_w << 16) / dst_w;
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118 eip = copy_row;
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119 for (i = 0; i < dst_w; ++i) {
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120 while (pos >= 0x10000L) {
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121 if (bpp == 2) {
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122 *eip++ = PREFIX16;
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123 }
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124 *eip++ = load;
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125 pos -= 0x10000L;
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126 }
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127 if (bpp == 2) {
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128 *eip++ = PREFIX16;
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129 }
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130 *eip++ = store;
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131 pos += inc;
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132 }
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133 *eip++ = RETURN;
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134
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135 /* Verify that we didn't overflow (too late!!!) */
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136 if (eip > (copy_row + sizeof(copy_row))) {
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137 SDL_SetError("Copy buffer overflow");
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138 return (-1);
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139 }
3405
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140 #ifdef HAVE_MPROTECT
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141 /* Make the code executable but not writeable */
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142 if (mprotect(copy_row, sizeof(copy_row), PROT_READ | PROT_EXEC) < 0) {
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143 SDL_SetError("Couldn't make copy buffer executable");
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144 return (-1);
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parents: 2859
diff changeset
145 }
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diff changeset
146 #endif
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147 last.status = 0;
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148 return (0);
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149 }
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150
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151 #endif /* USE_ASM_STRETCH */
0
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152
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153 #define DEFINE_COPY_ROW(name, type) \
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154 void name(type *src, int src_w, type *dst, int dst_w) \
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155 { \
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156 int i; \
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157 int pos, inc; \
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158 type pixel = 0; \
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159 \
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160 pos = 0x10000; \
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161 inc = (src_w << 16) / dst_w; \
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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162 for ( i=dst_w; i>0; --i ) { \
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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163 while ( pos >= 0x10000L ) { \
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164 pixel = *src++; \
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165 pos -= 0x10000L; \
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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166 } \
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167 *dst++ = pixel; \
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168 pos += inc; \
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169 } \
0
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170 }
1985
8055185ae4ed Added source color and alpha modulation support.
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parents: 1895
diff changeset
171 /* *INDENT-OFF* */
0
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parents:
diff changeset
172 DEFINE_COPY_ROW(copy_row1, Uint8)
1985
8055185ae4ed Added source color and alpha modulation support.
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parents: 1895
diff changeset
173 DEFINE_COPY_ROW(copy_row2, Uint16)
8055185ae4ed Added source color and alpha modulation support.
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diff changeset
174 DEFINE_COPY_ROW(copy_row4, Uint32)
8055185ae4ed Added source color and alpha modulation support.
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parents: 1895
diff changeset
175 /* *INDENT-ON* */
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diff changeset
176
0
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parents:
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177 /* The ASM code doesn't handle 24-bpp stretch blits */
1985
8055185ae4ed Added source color and alpha modulation support.
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diff changeset
178 void
8055185ae4ed Added source color and alpha modulation support.
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diff changeset
179 copy_row3(Uint8 * src, int src_w, Uint8 * dst, int dst_w)
0
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180 {
1895
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diff changeset
181 int i;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
182 int pos, inc;
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183 Uint8 pixel[3] = { 0, 0, 0 };
0
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184
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
185 pos = 0x10000;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
186 inc = (src_w << 16) / dst_w;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
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187 for (i = dst_w; i > 0; --i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
188 while (pos >= 0x10000L) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
189 pixel[0] = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
190 pixel[1] = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
191 pixel[2] = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
192 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
193 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
194 *dst++ = pixel[0];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
195 *dst++ = pixel[1];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
196 *dst++ = pixel[2];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
197 pos += inc;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
198 }
0
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199 }
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200
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diff changeset
201 /* Perform a stretch blit between two surfaces of the same format.
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202 NOTE: This function is not safe to call from multiple threads!
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203 */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
204 int
2828
7e5ff6cd05bf Added very slow software scaling to the X11 renderer
Sam Lantinga <slouken@libsdl.org>
parents: 1985
diff changeset
205 SDL_SoftStretch(SDL_Surface * src, const SDL_Rect * srcrect,
7e5ff6cd05bf Added very slow software scaling to the X11 renderer
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parents: 1985
diff changeset
206 SDL_Surface * dst, const SDL_Rect * dstrect)
0
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diff changeset
207 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
208 int src_locked;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
209 int dst_locked;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
210 int pos, inc;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
211 int dst_width;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
212 int dst_maxrow;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
213 int src_row, dst_row;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
214 Uint8 *srcp = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
215 Uint8 *dstp;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
216 SDL_Rect full_src;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
217 SDL_Rect full_dst;
3405
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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diff changeset
218 #ifdef USE_ASM_STRETCH
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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diff changeset
219 SDL_bool use_asm = SDL_TRUE;
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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diff changeset
220 #ifdef __GNUC__
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
221 int u1, u2;
0
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diff changeset
222 #endif
3405
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diff changeset
223 #endif /* USE_ASM_STRETCH */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
224 const int bpp = dst->format->BytesPerPixel;
0
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diff changeset
225
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
226 if (src->format->BitsPerPixel != dst->format->BitsPerPixel) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
227 SDL_SetError("Only works with same format surfaces");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
228 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
229 }
0
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diff changeset
230
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
231 /* Verify the blit rectangles */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
232 if (srcrect) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
233 if ((srcrect->x < 0) || (srcrect->y < 0) ||
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
234 ((srcrect->x + srcrect->w) > src->w) ||
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
235 ((srcrect->y + srcrect->h) > src->h)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
236 SDL_SetError("Invalid source blit rectangle");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
237 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
238 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
239 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
240 full_src.x = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
241 full_src.y = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
242 full_src.w = src->w;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
243 full_src.h = src->h;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
244 srcrect = &full_src;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
245 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
246 if (dstrect) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
247 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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parents: 1849
diff changeset
248 ((dstrect->x + dstrect->w) > dst->w) ||
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
249 ((dstrect->y + dstrect->h) > dst->h)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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250 SDL_SetError("Invalid destination blit rectangle");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
251 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
252 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
253 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
254 full_dst.x = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
255 full_dst.y = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
256 full_dst.w = dst->w;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
257 full_dst.h = dst->h;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1849
diff changeset
258 dstrect = &full_dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
259 }
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260
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261 /* Lock the destination if it's in hardware */
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262 dst_locked = 0;
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263 if (SDL_MUSTLOCK(dst)) {
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264 if (SDL_LockSurface(dst) < 0) {
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265 SDL_SetError("Unable to lock destination surface");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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266 return (-1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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267 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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268 dst_locked = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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269 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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270 /* Lock the source if it's in hardware */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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271 src_locked = 0;
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272 if (SDL_MUSTLOCK(src)) {
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273 if (SDL_LockSurface(src) < 0) {
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274 if (dst_locked) {
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275 SDL_UnlockSurface(dst);
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276 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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277 SDL_SetError("Unable to lock source surface");
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278 return (-1);
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279 }
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280 src_locked = 1;
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281 }
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282
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283 /* Set up the data... */
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284 pos = 0x10000;
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285 inc = (srcrect->h << 16) / dstrect->h;
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286 src_row = srcrect->y;
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287 dst_row = dstrect->y;
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288 dst_width = dstrect->w * bpp;
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289
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290 #ifdef USE_ASM_STRETCH
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291 /* Write the opcodes for this stretch */
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292 if ((bpp == 3) || (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0)) {
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293 use_asm = SDL_FALSE;
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294 }
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295 #endif
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296
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297 /* Perform the stretch blit */
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298 for (dst_maxrow = dst_row + dstrect->h; dst_row < dst_maxrow; ++dst_row) {
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299 dstp = (Uint8 *) dst->pixels + (dst_row * dst->pitch)
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300 + (dstrect->x * bpp);
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301 while (pos >= 0x10000L) {
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302 srcp = (Uint8 *) src->pixels + (src_row * src->pitch)
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303 + (srcrect->x * bpp);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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304 ++src_row;
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305 pos -= 0x10000L;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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306 }
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307 #ifdef USE_ASM_STRETCH
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308 if (use_asm) {
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309 #ifdef __GNUC__
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310 __asm__ __volatile__("call *%4":"=&D"(u1), "=&S"(u2)
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311 :"0"(dstp), "1"(srcp), "r"(copy_row)
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312 :"memory");
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313 #elif defined(_MSC_VER) || defined(__WATCOMC__)
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8055185ae4ed Added source color and alpha modulation support.
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314 /* *INDENT-OFF* */
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315 {
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316 void *code = copy_row;
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317 __asm {
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8055185ae4ed Added source color and alpha modulation support.
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318 push edi
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319 push esi
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320 mov edi, dstp
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321 mov esi, srcp
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322 call dword ptr code
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323 pop esi
8055185ae4ed Added source color and alpha modulation support.
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324 pop edi
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325 }
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326 }
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327 /* *INDENT-ON* */
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328 #else
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329 #error Need inline assembly for this compiler
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330 #endif
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331 } else
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332 #endif
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333 switch (bpp) {
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334 case 1:
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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335 copy_row1(srcp, srcrect->w, dstp, dstrect->w);
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336 break;
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337 case 2:
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338 copy_row2((Uint16 *) srcp, srcrect->w,
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339 (Uint16 *) dstp, dstrect->w);
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340 break;
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341 case 3:
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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342 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
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343 break;
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344 case 4:
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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345 copy_row4((Uint32 *) srcp, srcrect->w,
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346 (Uint32 *) dstp, dstrect->w);
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347 break;
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348 }
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349 pos += inc;
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350 }
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351
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352 /* We need to unlock the surfaces if they're locked */
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353 if (dst_locked) {
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354 SDL_UnlockSurface(dst);
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355 }
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356 if (src_locked) {
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357 SDL_UnlockSurface(src);
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358 }
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359 return (0);
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360 }
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361
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362 /* vi: set ts=4 sw=4 expandtab: */