annotate src/video/SDL_stretch.c @ 3877:81f66f258d77 SDL-1.2

Fixed bug #281 ------- Comment #2 From Christian Walther 2006-07-23 07:37 [reply] ------- Wow, that was an interesting bug to chase. It was a timing issue: it seems that for some reason, a certain time must pass between ShowMenuBar() being called in QZ_UnsetVideoMode() and the application quitting. Before rev. 1885, this delay was provided by the slow hand-coded fade. With the asynchronous Core Graphics fading introduced in rev. 1885, that delay was no longer present (most of the time) and the bug became apparent. Adding an SDL_Delay(100) somewhere between ShowMenuBar() and the end of QZ_VideoQuit() lowered the frequency of the bug appearing from "almost every time" to "very rarely" here. However, there is another solution: doing the ShowMenuBar() before releasing the captured display instead of afterwards. Apparently, no delay is necessary in that case, and it looks nicer to me anyway because it is the reverse order of the way things are set up in the beginning: capture display - set video mode - hide menu bar - ... - show menu bar - reset video mode - release captured display. So, this is what the attached patch does. In addition, I've taken the liberty of - removing some unused code that I forgot to remove in rev. 1885, - fixing two warnings about undeclared functions in SDL_QuartzVideo.m by including OpenGL.h (whose name is a bit misleading - it only declares CGL stuff, so there's no interference with SDL_opengl.h).
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 01:27:40 +0000
parents b5a4ac87b98c
children c121d94672cb 3feb94233f90
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] = { 0, 0, 0 };
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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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diff changeset
159 pixel[1] = *src++;
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parents:
diff changeset
160 pixel[2] = *src++;
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parents:
diff changeset
161 pos -= 0x10000L;
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parents:
diff changeset
162 }
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parents:
diff changeset
163 *dst++ = pixel[0];
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parents:
diff changeset
164 *dst++ = pixel[1];
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parents:
diff changeset
165 *dst++ = pixel[2];
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parents:
diff changeset
166 pos += inc;
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parents:
diff changeset
167 }
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parents:
diff changeset
168 }
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diff changeset
169
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parents:
diff changeset
170 /* Perform a stretch blit between two surfaces of the same format.
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parents:
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171 NOTE: This function is not safe to call from multiple threads!
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parents:
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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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parents:
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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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parents:
diff changeset
179 int dst_width;
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parents:
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180 int dst_maxrow;
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parents:
diff changeset
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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diff changeset
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:
diff changeset
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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parents:
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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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parents:
diff changeset
203 }
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diff changeset
204 } else {
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205 full_src.x = 0;
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206 full_src.y = 0;
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parents:
diff changeset
207 full_src.w = src->w;
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diff changeset
208 full_src.h = src->h;
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parents:
diff changeset
209 srcrect = &full_src;
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parents:
diff changeset
210 }
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parents:
diff changeset
211 if ( dstrect ) {
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parents:
diff changeset
212 if ( (dstrect->x < 0) || (dstrect->y < 0) ||
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parents:
diff changeset
213 ((dstrect->x+dstrect->w) > dst->w) ||
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parents:
diff changeset
214 ((dstrect->y+dstrect->h) > dst->h) ) {
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parents:
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215 SDL_SetError("Invalid destination blit rectangle");
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diff changeset
216 return(-1);
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parents:
diff changeset
217 }
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parents:
diff changeset
218 } else {
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diff changeset
219 full_dst.x = 0;
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diff changeset
220 full_dst.y = 0;
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parents:
diff changeset
221 full_dst.w = dst->w;
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diff changeset
222 full_dst.h = dst->h;
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diff changeset
223 dstrect = &full_dst;
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parents:
diff changeset
224 }
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diff changeset
225
894
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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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diff changeset
228 if ( SDL_MUSTLOCK(dst) ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
diff changeset
229 if ( SDL_LockSurface(dst) < 0 ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
230 SDL_SetError("Unable to lock destination surface");
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
231 return(-1);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
232 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
233 dst_locked = 1;
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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diff changeset
234 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
diff changeset
235 /* Lock the source if it's in hardware */
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
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diff changeset
236 src_locked = 0;
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
237 if ( SDL_MUSTLOCK(src) ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
238 if ( SDL_LockSurface(src) < 0 ) {
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
239 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
240 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
241 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
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>
parents: 769
diff changeset
243 return(-1);
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
244 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
245 src_locked = 1;
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
246 }
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
247
0
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parents:
diff changeset
248 /* Set up the data... */
74212992fb08 Initial revision
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parents:
diff changeset
249 pos = 0x10000;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
250 inc = (srcrect->h << 16) / dstrect->h;
74212992fb08 Initial revision
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parents:
diff changeset
251 src_row = srcrect->y;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
252 dst_row = dstrect->y;
74212992fb08 Initial revision
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parents:
diff changeset
253 dst_width = dstrect->w*bpp;
74212992fb08 Initial revision
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parents:
diff changeset
254
74212992fb08 Initial revision
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parents:
diff changeset
255 #ifdef USE_ASM_STRETCH
74212992fb08 Initial revision
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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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parents:
diff changeset
258 (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0) ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 dstp = (Uint8 *)dst->pixels + (dst_row*dst->pitch)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 switch (bpp) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 case 3:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
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
Sam Lantinga <slouken@lokigames.com>
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
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322 pos += inc;
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323 }
894
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324
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325 /* We need to unlock the surfaces if they're locked */
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326 if ( dst_locked ) {
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327 SDL_UnlockSurface(dst);
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328 }
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329 if ( src_locked ) {
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330 SDL_UnlockSurface(src);
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331 }
0
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332 return(0);
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333 }
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334