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0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #ifndef _SDL_blit_h
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29 #define _SDL_blit_h
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30
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31 #include "SDL_endian.h"
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32
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33 /* The structure passed to the low level blit functions */
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34 typedef struct {
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35 Uint8 *s_pixels;
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36 int s_width;
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37 int s_height;
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38 int s_skip;
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39 Uint8 *d_pixels;
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40 int d_width;
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41 int d_height;
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42 int d_skip;
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43 void *aux_data;
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44 SDL_PixelFormat *src;
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45 Uint8 *table;
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46 SDL_PixelFormat *dst;
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47 } SDL_BlitInfo;
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48
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49 /* The type definition for the low level blit functions */
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50 typedef void (*SDL_loblit)(SDL_BlitInfo *info);
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51
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52 /* This is the private info structure for software accelerated blits */
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53 struct private_swaccel {
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54 SDL_loblit blit;
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55 void *aux_data;
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56 };
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57
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58 /* Blit mapping definition */
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59 typedef struct SDL_BlitMap {
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60 SDL_Surface *dst;
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61 int identity;
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62 Uint8 *table;
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63 SDL_blit hw_blit;
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64 SDL_blit sw_blit;
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65 struct private_hwaccel *hw_data;
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66 struct private_swaccel *sw_data;
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67
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68 /* the version count matches the destination; mismatch indicates
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69 an invalid mapping */
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70 unsigned int format_version;
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71 } SDL_BlitMap;
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72
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73
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74 /* Definitions for special global blit functions */
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75 #include "SDL_blit_A.h"
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76
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77 /* Functions found in SDL_blit.c */
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78 extern int SDL_CalculateBlit(SDL_Surface *surface);
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79
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80 /* Functions found in SDL_blit_{0,1,N,A}.c */
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81 extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex);
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82 extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex);
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83 extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex);
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84 extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex);
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85
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86 /*
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87 * Useful macros for blitting routines
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88 */
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89
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90 #define FORMAT_EQUAL(A, B) \
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91 ((A)->BitsPerPixel == (B)->BitsPerPixel \
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92 && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))
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93
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94 /* Load pixel of the specified format from a buffer and get its R-G-B values */
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95 /* FIXME: rescale values to 0..255 here? */
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96 #define RGB_FROM_PIXEL(pixel, fmt, r, g, b) \
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97 { \
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98 r = (((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); \
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99 g = (((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); \
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100 b = (((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); \
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101 }
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102 #define RGB_FROM_RGB565(pixel, r, g, b) \
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103 { \
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104 r = (((pixel&0xF800)>>11)<<3); \
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105 g = (((pixel&0x07E0)>>5)<<2); \
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106 b = ((pixel&0x001F)<<3); \
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107 }
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108 #define RGB_FROM_RGB555(pixel, r, g, b) \
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109 { \
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110 r = (((pixel&0x7C00)>>10)<<3); \
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111 g = (((pixel&0x03E0)>>5)<<3); \
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112 b = ((pixel&0x001F)<<3); \
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113 }
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114 #define RGB_FROM_RGB888(pixel, r, g, b) \
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115 { \
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116 r = ((pixel&0xFF0000)>>16); \
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117 g = ((pixel&0xFF00)>>8); \
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118 b = (pixel&0xFF); \
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119 }
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120 #define RETRIEVE_RGB_PIXEL(buf, bpp, pixel) \
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121 do { \
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122 switch (bpp) { \
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123 case 2: \
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124 pixel = *((Uint16 *)(buf)); \
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125 break; \
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126 \
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127 case 3: { \
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128 Uint8 *B = (Uint8 *)(buf); \
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129 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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130 pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
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131 } else { \
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132 pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
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133 } \
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134 } \
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135 break; \
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136 \
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137 case 4: \
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138 pixel = *((Uint32 *)(buf)); \
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139 break; \
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140 \
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141 default: \
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142 pixel = 0; /* appease gcc */ \
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143 break; \
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144 } \
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145 } while(0)
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146
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147 #define DISEMBLE_RGB(buf, bpp, fmt, pixel, r, g, b) \
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148 do { \
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149 switch (bpp) { \
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150 case 2: \
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151 pixel = *((Uint16 *)(buf)); \
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152 break; \
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153 \
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154 case 3: { \
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155 Uint8 *B = (Uint8 *)buf; \
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156 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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157 pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
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158 } else { \
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159 pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
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160 } \
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161 } \
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162 break; \
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163 \
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164 case 4: \
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165 pixel = *((Uint32 *)(buf)); \
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166 break; \
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167 \
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168 default: \
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169 pixel = 0; /* prevent gcc from complaining */ \
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170 break; \
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171 } \
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172 RGB_FROM_PIXEL(pixel, fmt, r, g, b); \
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173 } while(0)
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174
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175 /* Assemble R-G-B values into a specified pixel format and store them */
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176 #define PIXEL_FROM_RGB(pixel, fmt, r, g, b) \
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177 { \
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178 pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
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179 ((g>>fmt->Gloss)<<fmt->Gshift)| \
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180 ((b>>fmt->Bloss)<<fmt->Bshift); \
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181 }
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182 #define RGB565_FROM_RGB(pixel, r, g, b) \
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183 { \
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184 pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3); \
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185 }
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186 #define RGB555_FROM_RGB(pixel, r, g, b) \
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187 { \
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188 pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3); \
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189 }
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190 #define RGB888_FROM_RGB(pixel, r, g, b) \
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191 { \
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192 pixel = (r<<16)|(g<<8)|b; \
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193 }
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194 #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) \
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195 { \
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196 switch (bpp) { \
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197 case 2: { \
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198 Uint16 pixel; \
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199 \
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200 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \
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201 *((Uint16 *)(buf)) = pixel; \
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202 } \
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203 break; \
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204 \
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205 case 3: { \
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206 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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207 *((buf)+fmt->Rshift/8) = r; \
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208 *((buf)+fmt->Gshift/8) = g; \
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209 *((buf)+fmt->Bshift/8) = b; \
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210 } else { \
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211 *((buf)+2-fmt->Rshift/8) = r; \
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212 *((buf)+2-fmt->Gshift/8) = g; \
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213 *((buf)+2-fmt->Bshift/8) = b; \
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214 } \
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215 } \
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216 break; \
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217 \
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218 case 4: { \
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219 Uint32 pixel; \
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220 \
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221 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \
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222 *((Uint32 *)(buf)) = pixel; \
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223 } \
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224 break; \
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225 } \
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226 }
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227 #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask) \
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228 { \
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229 switch (bpp) { \
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230 case 2: { \
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231 Uint16 *bufp; \
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232 Uint16 pixel; \
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233 \
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234 bufp = (Uint16 *)buf; \
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235 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \
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236 *bufp = pixel | (*bufp & Amask); \
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237 } \
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238 break; \
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239 \
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240 case 3: { \
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241 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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242 *((buf)+fmt->Rshift/8) = r; \
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243 *((buf)+fmt->Gshift/8) = g; \
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244 *((buf)+fmt->Bshift/8) = b; \
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245 } else { \
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246 *((buf)+2-fmt->Rshift/8) = r; \
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247 *((buf)+2-fmt->Gshift/8) = g; \
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248 *((buf)+2-fmt->Bshift/8) = b; \
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249 } \
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250 } \
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251 break; \
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252 \
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253 case 4: { \
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254 Uint32 *bufp; \
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255 Uint32 pixel; \
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256 \
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257 bufp = (Uint32 *)buf; \
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258 PIXEL_FROM_RGB(pixel, fmt, r, g, b); \
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259 *bufp = pixel | (*bufp & Amask); \
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260 } \
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261 break; \
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262 } \
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263 }
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264
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265 /* FIXME: Should we rescale alpha into 0..255 here? */
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266 #define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a) \
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267 { \
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268 r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \
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269 g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \
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270 b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \
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271 a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \
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272 }
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273 #define RGBA_FROM_8888(pixel, fmt, r, g, b, a) \
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274 { \
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275 r = (pixel&fmt->Rmask)>>fmt->Rshift; \
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276 g = (pixel&fmt->Gmask)>>fmt->Gshift; \
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277 b = (pixel&fmt->Bmask)>>fmt->Bshift; \
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278 a = (pixel&fmt->Amask)>>fmt->Ashift; \
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279 }
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280 #define RGBA_FROM_RGBA8888(pixel, r, g, b, a) \
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281 { \
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282 r = (pixel>>24); \
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283 g = ((pixel>>16)&0xFF); \
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284 b = ((pixel>>8)&0xFF); \
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285 a = (pixel&0xFF); \
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286 }
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287 #define RGBA_FROM_ARGB8888(pixel, r, g, b, a) \
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288 { \
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289 r = ((pixel>>16)&0xFF); \
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290 g = ((pixel>>8)&0xFF); \
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291 b = (pixel&0xFF); \
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292 a = (pixel>>24); \
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293 }
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294 #define RGBA_FROM_ABGR8888(pixel, r, g, b, a) \
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295 { \
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296 r = (pixel&0xFF); \
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297 g = ((pixel>>8)&0xFF); \
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298 b = ((pixel>>16)&0xFF); \
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299 a = (pixel>>24); \
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300 }
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301 #define DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a) \
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302 do { \
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303 switch (bpp) { \
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304 case 2: \
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305 pixel = *((Uint16 *)(buf)); \
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306 break; \
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307 \
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308 case 3: {/* FIXME: broken code (no alpha) */ \
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309 Uint8 *b = (Uint8 *)buf; \
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310 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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311 pixel = b[0] + (b[1] << 8) + (b[2] << 16); \
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312 } else { \
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313 pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \
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314 } \
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315 } \
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316 break; \
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317 \
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318 case 4: \
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319 pixel = *((Uint32 *)(buf)); \
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320 break; \
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321 \
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322 default: \
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323 pixel = 0; /* stop gcc complaints */ \
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324 break; \
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325 } \
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326 RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \
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327 pixel &= ~fmt->Amask; \
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328 } while(0)
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329
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330 /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
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331 #define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a) \
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332 { \
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333 pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \
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334 ((g>>fmt->Gloss)<<fmt->Gshift)| \
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335 ((b>>fmt->Bloss)<<fmt->Bshift)| \
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336 ((a<<fmt->Aloss)<<fmt->Ashift); \
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337 }
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338 #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \
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339 { \
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340 switch (bpp) { \
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341 case 2: { \
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342 Uint16 pixel; \
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343 \
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344 PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \
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345 *((Uint16 *)(buf)) = pixel; \
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346 } \
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347 break; \
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348 \
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349 case 3: { /* FIXME: broken code (no alpha) */ \
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350 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) { \
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351 *((buf)+fmt->Rshift/8) = r; \
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352 *((buf)+fmt->Gshift/8) = g; \
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353 *((buf)+fmt->Bshift/8) = b; \
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354 } else { \
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355 *((buf)+2-fmt->Rshift/8) = r; \
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356 *((buf)+2-fmt->Gshift/8) = g; \
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357 *((buf)+2-fmt->Bshift/8) = b; \
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358 } \
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359 } \
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360 break; \
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361 \
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362 case 4: { \
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363 Uint32 pixel; \
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364 \
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365 PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \
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366 *((Uint32 *)(buf)) = pixel; \
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367 } \
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368 break; \
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369 } \
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370 }
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371
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372 /* Blend the RGB values of two pixels based on a source alpha value */
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373 #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \
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374 do { \
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375 dR = (((sR-dR)*(A))>>8)+dR; \
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376 dG = (((sG-dG)*(A))>>8)+dG; \
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377 dB = (((sB-dB)*(A))>>8)+dB; \
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378 } while(0)
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379
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380 /* This is a very useful loop for optimizing blitters */
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381 #define USE_DUFFS_LOOP
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382 #ifdef USE_DUFFS_LOOP
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383
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384 /* 8-times unrolled loop */
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385 #define DUFFS_LOOP8(pixel_copy_increment, width) \
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386 { int n = (width+7)/8; \
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387 switch (width % 8) { \
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388 case 0: do { pixel_copy_increment; \
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389 case 7: pixel_copy_increment; \
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390 case 6: pixel_copy_increment; \
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391 case 5: pixel_copy_increment; \
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392 case 4: pixel_copy_increment; \
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393 case 3: pixel_copy_increment; \
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394 case 2: pixel_copy_increment; \
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395 case 1: pixel_copy_increment; \
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396 } while ( --n > 0 ); \
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397 } \
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398 }
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399
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400 /* 4-times unrolled loop */
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401 #define DUFFS_LOOP4(pixel_copy_increment, width) \
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402 { int n = (width+3)/4; \
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403 switch (width % 4) { \
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404 case 0: do { pixel_copy_increment; \
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405 case 3: pixel_copy_increment; \
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406 case 2: pixel_copy_increment; \
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407 case 1: pixel_copy_increment; \
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408 } while ( --n > 0 ); \
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409 } \
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410 }
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411
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412 /* Use the 8-times version of the loop by default */
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413 #define DUFFS_LOOP(pixel_copy_increment, width) \
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414 DUFFS_LOOP8(pixel_copy_increment, width)
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415
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416 #else
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417
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418 /* Don't use Duff's device to unroll loops */
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419 #define DUFFS_LOOP(pixel_copy_increment, width) \
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420 { int n; \
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421 for ( n=width; n > 0; --n ) { \
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422 pixel_copy_increment; \
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423 } \
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424 }
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425 #define DUFFS_LOOP8(pixel_copy_increment, width) \
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426 DUFFS_LOOP(pixel_copy_increment, width)
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427 #define DUFFS_LOOP4(pixel_copy_increment, width) \
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428 DUFFS_LOOP(pixel_copy_increment, width)
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429
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430 #endif /* USE_DUFFS_LOOP */
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431
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432 /* Prevent Visual C++ 6.0 from printing out stupid warnings */
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433 #if defined(_MSC_VER) && (_MSC_VER >= 600)
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434 #pragma warning(disable: 4550)
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435 #endif
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436
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437 #endif /* _SDL_blit_h */
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