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annotate src/video/SDL_stretch.c @ 5275:7aba0406c273

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Frank Zago to sdl The following patch fixes some of the bitrot for the Nintendo DS port. The support is still basic at the moment, but it allows to run the "general" test under the current head of tree (parent: 5269:11bd1585efb5 tip). Most of the patch is mine, but I integrated a couple changes that John Magnotti posted on Feb 1st.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 11:36:56 -0800
parents b530ef003506
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b530ef003506 Happy 2011! :)
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3 Copyright (C) 1997-2011 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) \
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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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diff changeset
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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diff changeset
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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diff changeset
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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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];
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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;
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 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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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 */
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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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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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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;
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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;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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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parents: 1849
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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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parents: 1849
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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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parents: 1849
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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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parents: 1849
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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parents: 1849
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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.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
271 }
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
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
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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parents: 1849
diff changeset
274 if (SDL_MUSTLOCK(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
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
diff changeset
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
diff changeset
277 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
278 }
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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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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parents: 1849
diff changeset
280 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
281 }
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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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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parents: 1849
diff changeset
283 }
894
1d1a823904d8 Don't crash if the stretch routines are used on hardware surfaces
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parents: 769
diff changeset
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.
Sam Lantinga <slouken@libsdl.org>
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
diff changeset
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
diff changeset
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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parents: 1849
diff changeset
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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parents: 1849
diff changeset
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
74212992fb08 Initial revision
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parents:
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.
Sam Lantinga <slouken@libsdl.org>
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
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.
Sam Lantinga <slouken@libsdl.org>
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.
Sam Lantinga <slouken@libsdl.org>
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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parents: 2859
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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parents: 2859
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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parents: 2859
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.
Sam Lantinga <slouken@libsdl.org>
parents: 1849
diff changeset
317 {
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
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.
Sam Lantinga <slouken@libsdl.org>
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
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
333 } else
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
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.
Sam Lantinga <slouken@libsdl.org>
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: */