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annotate src/video/SDL_stretch.c @ 5260:b0f5108fda60

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Cleaned up the file a bit for tutorial viewing
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 13:06:35 -0800
parents af1d018ebbe6
children b530ef003506
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, *fence;
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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 fence = copy_row + sizeof(copy_row)-2;
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120 for (i = 0; i < dst_w; ++i) {
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121 while (pos >= 0x10000L) {
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122 if (eip == fence) {
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123 return -1;
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124 }
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125 if (bpp == 2) {
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126 *eip++ = PREFIX16;
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127 }
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128 *eip++ = load;
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129 pos -= 0x10000L;
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130 }
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131 if (eip == fence) {
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132 return -1;
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133 }
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134 if (bpp == 2) {
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135 *eip++ = PREFIX16;
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136 }
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137 *eip++ = store;
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138 pos += inc;
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139 }
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140 *eip++ = RETURN;
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141
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142 #ifdef HAVE_MPROTECT
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143 /* Make the code executable but not writeable */
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144 if (mprotect(copy_row, sizeof(copy_row), PROT_READ | PROT_EXEC) < 0) {
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145 SDL_SetError("Couldn't make copy buffer executable");
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146 return (-1);
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147 }
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148 #endif
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149 last.status = 0;
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150 return (0);
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151 }
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152
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153 #endif /* USE_ASM_STRETCH */
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154
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155 #define DEFINE_COPY_ROW(name, type) \
4472
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156 static void name(type *src, int src_w, type *dst, int dst_w) \
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157 { \
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158 int i; \
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159 int pos, inc; \
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160 type pixel = 0; \
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161 \
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162 pos = 0x10000; \
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163 inc = (src_w << 16) / dst_w; \
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164 for ( i=dst_w; i>0; --i ) { \
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165 while ( pos >= 0x10000L ) { \
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166 pixel = *src++; \
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167 pos -= 0x10000L; \
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168 } \
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169 *dst++ = pixel; \
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170 pos += inc; \
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171 } \
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172 }
1985
8055185ae4ed Added source color and alpha modulation support.
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173 /* *INDENT-OFF* */
0
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174 DEFINE_COPY_ROW(copy_row1, Uint8)
1985
8055185ae4ed Added source color and alpha modulation support.
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175 DEFINE_COPY_ROW(copy_row2, Uint16)
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176 DEFINE_COPY_ROW(copy_row4, Uint32)
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177 /* *INDENT-ON* */
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178
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179 /* The ASM code doesn't handle 24-bpp stretch blits */
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180 static void
1985
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181 copy_row3(Uint8 * src, int src_w, Uint8 * dst, int dst_w)
0
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182 {
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183 int i;
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184 int pos, inc;
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185 Uint8 pixel[3] = { 0, 0, 0 };
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186
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187 pos = 0x10000;
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188 inc = (src_w << 16) / dst_w;
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189 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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190 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
191 pixel[0] = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
192 pixel[1] = *src++;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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193 pixel[2] = *src++;
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194 pos -= 0x10000L;
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195 }
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196 *dst++ = pixel[0];
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197 *dst++ = pixel[1];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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198 *dst++ = pixel[2];
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199 pos += inc;
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200 }
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201 }
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202
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203 /* Perform a stretch blit between two surfaces of the same format.
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204 NOTE: This function is not safe to call from multiple threads!
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205 */
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diff changeset
206 int
2828
7e5ff6cd05bf Added very slow software scaling to the X11 renderer
Sam Lantinga <slouken@libsdl.org>
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diff changeset
207 SDL_SoftStretch(SDL_Surface * src, const SDL_Rect * srcrect,
7e5ff6cd05bf Added very slow software scaling to the X11 renderer
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diff changeset
208 SDL_Surface * dst, const SDL_Rect * dstrect)
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209 {
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diff changeset
210 int src_locked;
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diff changeset
211 int dst_locked;
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diff changeset
212 int pos, inc;
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diff changeset
213 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
214 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
215 int src_row, 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
216 Uint8 *srcp = NULL;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
217 Uint8 *dstp;
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diff changeset
218 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
219 SDL_Rect full_dst;
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diff changeset
220 #ifdef USE_ASM_STRETCH
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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diff changeset
221 SDL_bool use_asm = SDL_TRUE;
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diff changeset
222 #ifdef __GNUC__
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223 int u1, u2;
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224 #endif
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225 #endif /* USE_ASM_STRETCH */
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226 const int bpp = dst->format->BytesPerPixel;
0
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227
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diff changeset
228 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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229 SDL_SetError("Only works with same format surfaces");
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230 return (-1);
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diff changeset
231 }
0
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232
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diff changeset
233 /* 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
234 if (srcrect) {
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235 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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diff changeset
236 ((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
237 ((srcrect->y + srcrect->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
238 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
239 return (-1);
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diff changeset
240 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
241 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
242 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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243 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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diff changeset
244 full_src.w = src->w;
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diff changeset
245 full_src.h = src->h;
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246 srcrect = &full_src;
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diff changeset
247 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
248 if (dstrect) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
249 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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diff changeset
250 ((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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diff changeset
251 ((dstrect->y + dstrect->h) > dst->h)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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252 SDL_SetError("Invalid destination 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
253 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
254 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
255 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
256 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
257 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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diff changeset
258 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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diff changeset
259 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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diff changeset
260 dstrect = &full_dst;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
261 }
0
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262
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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
263 /* Lock the destination 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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diff changeset
264 dst_locked = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
265 if (SDL_MUSTLOCK(dst)) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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266 if (SDL_LockSurface(dst) < 0) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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267 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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diff changeset
268 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
269 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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270 dst_locked = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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271 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
272 /* 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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parents: 1849
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273 src_locked = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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274 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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parents: 1849
diff changeset
275 if (SDL_LockSurface(src) < 0) {
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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276 if (dst_locked) {
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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277 SDL_UnlockSurface(dst);
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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278 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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279 SDL_SetError("Unable to lock source surface");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
280 return (-1);
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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281 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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282 src_locked = 1;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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283 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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284
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
285 /* Set up the data... */
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
286 pos = 0x10000;
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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287 inc = (srcrect->h << 16) / dstrect->h;
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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288 src_row = srcrect->y;
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
289 dst_row = dstrect->y;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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290 dst_width = dstrect->w * bpp;
0
74212992fb08 Initial revision
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parents:
diff changeset
291
74212992fb08 Initial revision
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parents:
diff changeset
292 #ifdef 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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293 /* Write the opcodes for this stretch */
3405
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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parents: 2859
diff changeset
294 if ((bpp == 3) || (generate_rowbytes(srcrect->w, dstrect->w, bpp) < 0)) {
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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parents: 2859
diff changeset
295 use_asm = SDL_FALSE;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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296 }
0
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diff changeset
297 #endif
74212992fb08 Initial revision
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parents:
diff changeset
298
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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299 /* Perform the stretch blit */
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
300 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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parents: 1849
diff changeset
301 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
302 + (dstrect->x * bpp);
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
303 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
304 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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parents: 1849
diff changeset
305 + (srcrect->x * bpp);
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
306 ++src_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
307 pos -= 0x10000L;
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
308 }
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 #ifdef USE_ASM_STRETCH
3405
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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diff changeset
310 if (use_asm) {
0
74212992fb08 Initial revision
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parents:
diff changeset
311 #ifdef __GNUC__
3405
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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diff changeset
312 __asm__ __volatile__("call *%4":"=&D"(u1), "=&S"(u2)
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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diff changeset
313 :"0"(dstp), "1"(srcp), "r"(copy_row)
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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parents: 2859
diff changeset
314 :"memory");
1442
e3242177fe4a Updated OS/2 build, yay!
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
315 #elif defined(_MSC_VER) || defined(__WATCOMC__)
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
316 /* *INDENT-OFF* */
1895
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
317 {
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
318 void *code = copy_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
319 __asm {
1985
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
320 push edi
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
321 push esi
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
322 mov edi, dstp
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
323 mov esi, srcp
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
324 call dword ptr code
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
325 pop esi
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
326 pop edi
8055185ae4ed Added source color and alpha modulation support.
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
327 }
1895
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
328 }
1985
8055185ae4ed Added source color and alpha modulation support.
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parents: 1895
diff changeset
329 /* *INDENT-ON* */
0
74212992fb08 Initial revision
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parents:
diff changeset
330 #else
74212992fb08 Initial revision
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parents:
diff changeset
331 #error Need inline assembly for this compiler
74212992fb08 Initial revision
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parents:
diff changeset
332 #endif
3405
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
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parents: 2859
diff changeset
333 } else
0
74212992fb08 Initial revision
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parents:
diff changeset
334 #endif
3405
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
335 switch (bpp) {
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
336 case 1:
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
337 copy_row1(srcp, srcrect->w, dstp, dstrect->w);
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
338 break;
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
339 case 2:
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
340 copy_row2((Uint16 *) srcp, srcrect->w,
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
341 (Uint16 *) dstp, dstrect->w);
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
342 break;
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
343 case 3:
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
344 copy_row3(srcp, srcrect->w, dstp, dstrect->w);
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
345 break;
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
346 case 4:
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
347 copy_row4((Uint32 *) srcp, srcrect->w,
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
348 (Uint32 *) dstp, dstrect->w);
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
349 break;
d5f2dd33f4eb Merged improvements to SDL_SoftStretch() from SDL 1.2
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
350 }
1895
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
351 pos += inc;
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
352 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
353
1895
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
354 /* We need to unlock the surfaces if they're locked */
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
355 if (dst_locked) {
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
356 SDL_UnlockSurface(dst);
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
357 }
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
358 if (src_locked) {
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
359 SDL_UnlockSurface(src);
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
360 }
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
361 return (0);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
362 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
363
1895
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
364 /* vi: set ts=4 sw=4 expandtab: */