annotate src/video/SDL_blit.h @ 1861:b42823412c3b

Fixed bug #232 ------- Comment #2 From Matthias Geissert 2006-05-24 07:54 [reply] ------- See http://dri.sourceforge.net/doc/DRIuserguide.html, section 11.5. There is written that you need to use RTLD_GLOBAL, since, otherwise, nested open of dynamic libraries doesn't work. However, This is necassary in this case, since libGL opens the hardware-specific driver/library. I hope this helps you.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 20 Jun 2006 03:52:41 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb 8582c6a5ca16
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 #ifndef _SDL_blit_h
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25 #define _SDL_blit_h
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26
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27 #include "SDL_endian.h"
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28
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29 /* The structure passed to the low level blit functions */
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30 typedef struct {
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31 Uint8 *s_pixels;
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32 int s_width;
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33 int s_height;
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34 int s_skip;
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35 Uint8 *d_pixels;
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36 int d_width;
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37 int d_height;
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38 int d_skip;
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39 void *aux_data;
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40 SDL_PixelFormat *src;
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41 Uint8 *table;
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42 SDL_PixelFormat *dst;
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43 } SDL_BlitInfo;
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44
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45 /* The type definition for the low level blit functions */
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46 typedef void (*SDL_loblit)(SDL_BlitInfo *info);
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47
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48 /* This is the private info structure for software accelerated blits */
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49 struct private_swaccel {
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50 SDL_loblit blit;
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51 void *aux_data;
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52 };
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53
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54 /* Blit mapping definition */
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55 typedef struct SDL_BlitMap {
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56 SDL_Surface *dst;
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57 int identity;
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58 Uint8 *table;
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59 SDL_blit hw_blit;
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60 SDL_blit sw_blit;
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61 struct private_hwaccel *hw_data;
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62 struct private_swaccel *sw_data;
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63
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64 /* the version count matches the destination; mismatch indicates
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65 an invalid mapping */
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66 unsigned int format_version;
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67 } SDL_BlitMap;
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68
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69
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70 /* Functions found in SDL_blit.c */
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71 extern int SDL_CalculateBlit(SDL_Surface *surface);
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72
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73 /* Functions found in SDL_blit_{0,1,N,A}.c */
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74 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex);
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75 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex);
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76 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex);
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77 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex);
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78
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79 /*
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80 * Useful macros for blitting routines
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81 */
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82
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83 #define FORMAT_EQUAL(A, B) \
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84 ((A)->BitsPerPixel == (B)->BitsPerPixel \
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85 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))
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86
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87 /* Load pixel of the specified format from a buffer and get its R-G-B values */
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88 /* FIXME: rescale values to 0..255 here? */
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89 #define RGB_FROM_PIXEL(Pixel, fmt, r, g, b) \
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90 { \
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91 r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \
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92 g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \
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93 b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \
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94 }
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95 #define RGB_FROM_RGB565(Pixel, r, g, b) \
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96 { \
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97 r = (((Pixel&0xF800)>>11)<<3); \
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98 g = (((Pixel&0x07E0)>>5)<<2); \
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99 b = ((Pixel&0x001F)<<3); \
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100 }
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101 #define RGB_FROM_RGB555(Pixel, r, g, b) \
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102 { \
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103 r = (((Pixel&0x7C00)>>10)<<3); \
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104 g = (((Pixel&0x03E0)>>5)<<3); \
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105 b = ((Pixel&0x001F)<<3); \
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106 }
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107 #define RGB_FROM_RGB888(Pixel, r, g, b) \
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108 { \
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109 r = ((Pixel&0xFF0000)>>16); \
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110 g = ((Pixel&0xFF00)>>8); \
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111 b = (Pixel&0xFF); \
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112 }
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113 #define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel) \
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114 do { \
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115 switch (bpp) { \
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116 case 2: \
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117 Pixel = *((Uint16 *)(buf)); \
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118 break; \
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119 \
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120 case 3: { \
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121 Uint8 *B = (Uint8 *)(buf); \
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122 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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123 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
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124 } else { \
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125 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
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126 } \
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127 } \
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128 break; \
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129 \
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130 case 4: \
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131 Pixel = *((Uint32 *)(buf)); \
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132 break; \
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133 \
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134 default: \
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135 Pixel = 0; /* appease gcc */ \
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136 break; \
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137 } \
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138 } while(0)
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139
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140 #define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b) \
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141 do { \
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142 switch (bpp) { \
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143 case 2: \
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144 Pixel = *((Uint16 *)(buf)); \
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145 break; \
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146 \
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147 case 3: { \
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148 Uint8 *B = (Uint8 *)buf; \
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149 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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150 Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
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151 } else { \
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152 Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
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153 } \
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154 } \
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155 break; \
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156 \
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157 case 4: \
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158 Pixel = *((Uint32 *)(buf)); \
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159 break; \
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160 \
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161 default: \
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162 Pixel = 0; /* prevent gcc from complaining */ \
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163 break; \
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164 } \
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165 RGB_FROM_PIXEL(Pixel, fmt, r, g, b); \
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166 } while(0)
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167
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168 /* Assemble R-G-B values into a specified pixel format and store them */
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169 #define PIXEL_FROM_RGB(Pixel, fmt, r, g, b) \
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170 { \
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171 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
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172 ((g>>fmt->Gloss)<<fmt->Gshift)| \
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173 ((b>>fmt->Bloss)<<fmt->Bshift); \
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174 }
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175 #define RGB565_FROM_RGB(Pixel, r, g, b) \
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176 { \
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177 Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \
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178 }
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179 #define RGB555_FROM_RGB(Pixel, r, g, b) \
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180 { \
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181 Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \
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182 }
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183 #define RGB888_FROM_RGB(Pixel, r, g, b) \
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184 { \
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185 Pixel = (r<<16)|(g<<8)|b; \
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186 }
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187 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \
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188 { \
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189 switch (bpp) { \
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190 case 2: { \
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191 Uint16 Pixel; \
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192 \
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193 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \
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194 *((Uint16 *)(buf)) = Pixel; \
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195 } \
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196 break; \
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197 \
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198 case 3: { \
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199 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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200 *((buf)+fmt->Rshift/8) = r; \
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201 *((buf)+fmt->Gshift/8) = g; \
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202 *((buf)+fmt->Bshift/8) = b; \
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203 } else { \
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204 *((buf)+2-fmt->Rshift/8) = r; \
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205 *((buf)+2-fmt->Gshift/8) = g; \
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206 *((buf)+2-fmt->Bshift/8) = b; \
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207 } \
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208 } \
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209 break; \
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210 \
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211 case 4: { \
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212 Uint32 Pixel; \
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213 \
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214 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \
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215 *((Uint32 *)(buf)) = Pixel; \
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216 } \
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217 break; \
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218 } \
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219 }
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220 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \
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221 { \
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222 switch (bpp) { \
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223 case 2: { \
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224 Uint16 *bufp; \
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225 Uint16 Pixel; \
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226 \
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227 bufp = (Uint16 *)buf; \
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228 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \
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229 *bufp = Pixel | (*bufp & Amask); \
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230 } \
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231 break; \
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232 \
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233 case 3: { \
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234 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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235 *((buf)+fmt->Rshift/8) = r; \
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236 *((buf)+fmt->Gshift/8) = g; \
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237 *((buf)+fmt->Bshift/8) = b; \
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238 } else { \
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239 *((buf)+2-fmt->Rshift/8) = r; \
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240 *((buf)+2-fmt->Gshift/8) = g; \
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241 *((buf)+2-fmt->Bshift/8) = b; \
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242 } \
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243 } \
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244 break; \
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245 \
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246 case 4: { \
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247 Uint32 *bufp; \
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248 Uint32 Pixel; \
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249 \
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250 bufp = (Uint32 *)buf; \
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251 PIXEL_FROM_RGB(Pixel, fmt, r, g, b); \
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252 *bufp = Pixel | (*bufp & Amask); \
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253 } \
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254 break; \
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255 } \
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256 }
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257
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258 /* FIXME: Should we rescale alpha into 0..255 here? */
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259 #define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a) \
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260 { \
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261 r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \
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262 g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \
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263 b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \
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264 a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \
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265 }
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266 #define RGBA_FROM_8888(Pixel, fmt, r, g, b, a) \
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267 { \
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268 r = (Pixel&fmt->Rmask)>>fmt->Rshift; \
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269 g = (Pixel&fmt->Gmask)>>fmt->Gshift; \
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270 b = (Pixel&fmt->Bmask)>>fmt->Bshift; \
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271 a = (Pixel&fmt->Amask)>>fmt->Ashift; \
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272 }
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273 #define RGBA_FROM_RGBA8888(Pixel, r, g, b, a) \
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274 { \
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275 r = (Pixel>>24); \
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276 g = ((Pixel>>16)&0xFF); \
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277 b = ((Pixel>>8)&0xFF); \
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278 a = (Pixel&0xFF); \
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279 }
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280 #define RGBA_FROM_ARGB8888(Pixel, r, g, b, a) \
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281 { \
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282 r = ((Pixel>>16)&0xFF); \
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283 g = ((Pixel>>8)&0xFF); \
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284 b = (Pixel&0xFF); \
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285 a = (Pixel>>24); \
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286 }
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287 #define RGBA_FROM_ABGR8888(Pixel, r, g, b, a) \
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288 { \
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289 r = (Pixel&0xFF); \
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290 g = ((Pixel>>8)&0xFF); \
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291 b = ((Pixel>>16)&0xFF); \
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292 a = (Pixel>>24); \
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293 }
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294 #define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a) \
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295 do { \
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296 switch (bpp) { \
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297 case 2: \
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298 Pixel = *((Uint16 *)(buf)); \
0
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299 break; \
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300 \
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301 case 3: {/* FIXME: broken code (no alpha) */ \
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302 Uint8 *b = (Uint8 *)buf; \
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303 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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304 Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \
0
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305 } else { \
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306 Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \
0
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307 } \
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308 } \
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309 break; \
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310 \
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311 case 4: \
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312 Pixel = *((Uint32 *)(buf)); \
0
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313 break; \
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314 \
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315 default: \
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316 Pixel = 0; /* stop gcc complaints */ \
0
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317 break; \
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318 } \
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319 RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a); \
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320 Pixel &= ~fmt->Amask; \
0
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321 } while(0)
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322
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323 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
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324 #define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a) \
0
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325 { \
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326 Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
0
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327 ((g>>fmt->Gloss)<<fmt->Gshift)| \
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328 ((b>>fmt->Bloss)<<fmt->Bshift)| \
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917cc5c56176 Fixed alpha blending bug (thanks Glenn!)
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329 ((a>>fmt->Aloss)<<fmt->Ashift); \
0
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330 }
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331 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \
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332 { \
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333 switch (bpp) { \
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334 case 2: { \
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335 Uint16 Pixel; \
0
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336 \
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337 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \
2651158f59b8 Enable altivec blitters on PowerPC Linux, and some fixes for recent
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338 *((Uint16 *)(buf)) = Pixel; \
0
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339 } \
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340 break; \
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341 \
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342 case 3: { /* FIXME: broken code (no alpha) */ \
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343 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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344 *((buf)+fmt->Rshift/8) = r; \
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345 *((buf)+fmt->Gshift/8) = g; \
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346 *((buf)+fmt->Bshift/8) = b; \
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347 } else { \
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348 *((buf)+2-fmt->Rshift/8) = r; \
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349 *((buf)+2-fmt->Gshift/8) = g; \
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350 *((buf)+2-fmt->Bshift/8) = b; \
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351 } \
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352 } \
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353 break; \
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354 \
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355 case 4: { \
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356 Uint32 Pixel; \
0
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357 \
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358 PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a); \
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359 *((Uint32 *)(buf)) = Pixel; \
0
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360 } \
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361 break; \
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362 } \
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363 }
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364
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365 /* Blend the RGB values of two Pixels based on a source alpha value */
0
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366 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \
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367 do { \
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368 dR = (((sR-dR)*(A))>>8)+dR; \
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369 dG = (((sG-dG)*(A))>>8)+dG; \
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370 dB = (((sB-dB)*(A))>>8)+dB; \
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371 } while(0)
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372
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373 /* Blend the RGB values of two Pixels based on a source alpha value */
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374 #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \
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375 do { \
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376 unsigned tR, tG, tB, tA; \
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377 tA = 255 - sA; \
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378 tR = 1 + (sR * sA) + (dR * tA); \
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379 dR = (tR + (tR >> 8)) >> 8; \
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380 tG = 1 + (sG * sA) + (dG * tA); \
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381 dG = (tG + (tG >> 8)) >> 8; \
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382 tB = 1 + (sB * sA) + (dB * tA); \
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383 dB = (tB + (tB >> 8)) >> 8; \
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384 } while(0)
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385
ffaaf7ecf685 Altivec-optimized blitters!
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386
0
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387 /* This is a very useful loop for optimizing blitters */
553
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
Sam Lantinga <slouken@libsdl.org>
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diff changeset
388 #if defined(_MSC_VER) && (_MSC_VER == 1300)
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
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diff changeset
389 /* There's a bug in the Visual C++ 7 optimizer when compiling this code */
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
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diff changeset
390 #else
0
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391 #define USE_DUFFS_LOOP
553
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
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diff changeset
392 #endif
0
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393 #ifdef USE_DUFFS_LOOP
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394
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diff changeset
395 /* 8-times unrolled loop */
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diff changeset
396 #define DUFFS_LOOP8(pixel_copy_increment, width) \
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diff changeset
397 { int n = (width+7)/8; \
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
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parents: 0
diff changeset
398 switch (width & 7) { \
0
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diff changeset
399 case 0: do { pixel_copy_increment; \
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diff changeset
400 case 7: pixel_copy_increment; \
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diff changeset
401 case 6: pixel_copy_increment; \
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diff changeset
402 case 5: pixel_copy_increment; \
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parents:
diff changeset
403 case 4: pixel_copy_increment; \
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parents:
diff changeset
404 case 3: pixel_copy_increment; \
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parents:
diff changeset
405 case 2: pixel_copy_increment; \
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parents:
diff changeset
406 case 1: pixel_copy_increment; \
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parents:
diff changeset
407 } while ( --n > 0 ); \
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parents:
diff changeset
408 } \
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diff changeset
409 }
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parents:
diff changeset
410
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parents:
diff changeset
411 /* 4-times unrolled loop */
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parents:
diff changeset
412 #define DUFFS_LOOP4(pixel_copy_increment, width) \
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diff changeset
413 { int n = (width+3)/4; \
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
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parents: 0
diff changeset
414 switch (width & 3) { \
0
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diff changeset
415 case 0: do { pixel_copy_increment; \
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diff changeset
416 case 3: pixel_copy_increment; \
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parents:
diff changeset
417 case 2: pixel_copy_increment; \
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diff changeset
418 case 1: pixel_copy_increment; \
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parents:
diff changeset
419 } while ( --n > 0 ); \
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parents:
diff changeset
420 } \
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diff changeset
421 }
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diff changeset
422
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
423 /* 2 - times unrolled loop */
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
424 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
425 double_pixel_copy_increment, width) \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
426 { int n, w = width; \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
427 if( w & 1 ) { \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
428 pixel_copy_increment; \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
429 w--; \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
430 } \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
431 if ( w > 0 ) { \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
432 n = ( w + 2) / 4; \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
433 switch( w & 2 ) { \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
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diff changeset
434 case 0: do { double_pixel_copy_increment; \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
435 case 2: double_pixel_copy_increment; \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
436 } while ( --n > 0 ); \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
437 } \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
438 } \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
439 }
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
440
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
441 /* 2 - times unrolled loop 4 pixels */
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
442 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
443 double_pixel_copy_increment, \
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
444 quatro_pixel_copy_increment, width) \
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445 { int n, w = width; \
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446 if(w & 1) { \
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447 pixel_copy_increment; \
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448 w--; \
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449 } \
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450 if(w & 2) { \
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451 double_pixel_copy_increment; \
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452 w -= 2; \
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453 } \
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454 if ( w > 0 ) { \
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455 n = ( w + 7 ) / 8; \
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456 switch( w & 4 ) { \
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457 case 0: do { quatro_pixel_copy_increment; \
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458 case 4: quatro_pixel_copy_increment; \
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459 } while ( --n > 0 ); \
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460 } \
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461 } \
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462 }
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463
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464 /* Use the 8-times version of the loop by default */
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465 #define DUFFS_LOOP(pixel_copy_increment, width) \
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466 DUFFS_LOOP8(pixel_copy_increment, width)
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467
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468 #else
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469
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470 /* Don't use Duff's device to unroll loops */
689
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471 #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \
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472 double_pixel_copy_increment, width) \
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473 { int n = width; \
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474 if( n & 1 ) { \
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475 pixel_copy_increment; \
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476 n--; \
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477 } \
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478 n=n>>1; \
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479 for(; n > 0; --n) { \
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480 double_pixel_copy_increment; \
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481 } \
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482 }
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483
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484 /* Don't use Duff's device to unroll loops */
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485 #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \
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486 double_pixel_copy_increment, \
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487 quatro_pixel_copy_increment, width) \
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488 { int n = width; \
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489 if(n & 1) { \
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490 pixel_copy_increment; \
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491 n--; \
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492 } \
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493 if(n & 2) { \
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494 double_pixel_copy_increment; \
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495 n -= 2; \
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496 } \
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497 n=n>>2; \
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498 for(; n > 0; --n) { \
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499 quatro_pixel_copy_increment; \
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500 } \
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501 }
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502
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503 /* Don't use Duff's device to unroll loops */
0
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504 #define DUFFS_LOOP(pixel_copy_increment, width) \
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505 { int n; \
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506 for ( n=width; n > 0; --n ) { \
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507 pixel_copy_increment; \
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508 } \
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509 }
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510 #define DUFFS_LOOP8(pixel_copy_increment, width) \
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511 DUFFS_LOOP(pixel_copy_increment, width)
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512 #define DUFFS_LOOP4(pixel_copy_increment, width) \
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513 DUFFS_LOOP(pixel_copy_increment, width)
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514
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515 #endif /* USE_DUFFS_LOOP */
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516
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517 /* Prevent Visual C++ 6.0 from printing out stupid warnings */
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518 #if defined(_MSC_VER) && (_MSC_VER >= 600)
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519 #pragma warning(disable: 4550)
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520 #endif
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521
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522 #endif /* _SDL_blit_h */