Mercurial > sdl-ios-xcode
annotate include/SDL_surface.h @ 2888:32e8bbba1e94
Added stubs for software implementations of blending fills and line drawing
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 20 Dec 2008 13:14:28 +0000 |
parents | 99210400e8b9 |
children | 133601e3b255 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
2859 | 3 Copyright (C) 1997-2009 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 |
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23 /** |
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24 * \file SDL_surface.h |
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25 * |
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26 * Header file for SDL_surface definition and management functions |
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27 */ |
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28 |
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29 #ifndef _SDL_surface_h |
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30 #define _SDL_surface_h |
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31 |
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32 #include "SDL_stdinc.h" |
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33 #include "SDL_pixels.h" |
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34 #include "SDL_rect.h" |
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35 #include "SDL_rwops.h" |
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36 |
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37 #include "begin_code.h" |
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38 /* Set up for C function definitions, even when using C++ */ |
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39 #ifdef __cplusplus |
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40 /* *INDENT-OFF* */ |
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41 extern "C" { |
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42 /* *INDENT-ON* */ |
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43 #endif |
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44 |
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45 /* These are the currently supported flags for the SDL_surface */ |
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46 /* Used internally (read-only) */ |
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47 #define SDL_PREALLOC 0x00000001 /* Surface uses preallocated memory */ |
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48 #define SDL_RLEACCEL 0x00000002 /* Surface is RLE encoded */ |
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49 |
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50 /* Evaluates to true if the surface needs to be locked before access */ |
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51 #define SDL_MUSTLOCK(S) (((S)->flags & SDL_RLEACCEL) != 0) |
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52 |
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53 /** |
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54 * \struct SDL_Surface |
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55 * |
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56 * \brief A collection of pixels used in software blitting |
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57 * |
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58 * \note This structure should be treated as read-only, except for 'pixels', |
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59 * which, if not NULL, contains the raw pixel data for the surface. |
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60 */ |
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61 typedef struct SDL_Surface |
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62 { |
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63 Uint32 flags; /**< Read-only */ |
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64 SDL_PixelFormat *format; /**< Read-only */ |
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65 int w, h; /**< Read-only */ |
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66 int pitch; /**< Read-only */ |
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67 void *pixels; /**< Read-write */ |
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68 |
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69 /* Application data associated with the surfade */ |
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70 void *userdata; /**< Read-write */ |
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71 |
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72 /* information needed for surfaces requiring locks */ |
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73 int locked; /**< Read-only */ |
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74 void *lock_data; /**< Read-only */ |
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75 |
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76 /* clipping information */ |
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77 SDL_Rect clip_rect; /**< Read-only */ |
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78 |
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79 /* info for fast blit mapping to other surfaces */ |
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80 struct SDL_BlitMap *map; /**< Private */ |
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81 |
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82 /* format version, bumped at every change to invalidate blit maps */ |
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83 unsigned int format_version; /**< Private */ |
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84 |
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85 /* Reference count -- used when freeing surface */ |
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86 int refcount; /**< Read-mostly */ |
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87 } SDL_Surface; |
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88 |
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89 /** |
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90 * \typedef SDL_blit |
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91 * |
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92 * \brief The type of function used for surface blitting functions |
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93 */ |
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94 typedef int (*SDL_blit) (struct SDL_Surface * src, SDL_Rect * srcrect, |
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95 struct SDL_Surface * dst, SDL_Rect * dstrect); |
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96 |
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97 /* |
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98 * Allocate and free an RGB surface (must be called after SDL_SetVideoMode) |
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99 * If the depth is 4 or 8 bits, an empty palette is allocated for the surface. |
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100 * If the depth is greater than 8 bits, the pixel format is set using the |
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101 * flags '[RGB]mask'. |
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102 * If the function runs out of memory, it will return NULL. |
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103 * |
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104 * The 'flags' are obsolete and should be set to 0. |
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105 */ |
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106 extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurface |
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107 (Uint32 flags, int width, int height, int depth, |
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108 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask); |
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109 extern DECLSPEC SDL_Surface *SDLCALL SDL_CreateRGBSurfaceFrom(void *pixels, |
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110 int width, |
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111 int height, |
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112 int depth, |
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113 int pitch, |
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114 Uint32 Rmask, |
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115 Uint32 Gmask, |
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116 Uint32 Bmask, |
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117 Uint32 Amask); |
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118 extern DECLSPEC void SDLCALL SDL_FreeSurface(SDL_Surface * surface); |
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119 |
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120 /** |
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121 * \fn int SDL_SetSurfacePalette(SDL_Surface *surface, SDL_Palette *palette) |
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122 * |
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123 * \brief Set the palette used by a surface. |
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124 * |
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125 * \return 0, or -1 if the surface format doesn't use a palette. |
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126 * |
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127 * \note A single palette can be shared with many surfaces. |
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128 */ |
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129 extern DECLSPEC int SDLCALL SDL_SetSurfacePalette(SDL_Surface * surface, |
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130 SDL_Palette * palette); |
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131 |
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132 /* |
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133 * SDL_LockSurface() sets up a surface for directly accessing the pixels. |
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134 * Between calls to SDL_LockSurface()/SDL_UnlockSurface(), you can write |
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135 * to and read from 'surface->pixels', using the pixel format stored in |
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136 * 'surface->format'. Once you are done accessing the surface, you should |
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137 * use SDL_UnlockSurface() to release it. |
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138 * |
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139 * Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates |
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140 * to 0, then you can read and write to the surface at any time, and the |
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141 * pixel format of the surface will not change. |
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142 * |
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143 * No operating system or library calls should be made between lock/unlock |
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144 * pairs, as critical system locks may be held during this time. |
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145 * |
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146 * SDL_LockSurface() returns 0, or -1 if the surface couldn't be locked. |
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147 */ |
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148 extern DECLSPEC int SDLCALL SDL_LockSurface(SDL_Surface * surface); |
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149 extern DECLSPEC void SDLCALL SDL_UnlockSurface(SDL_Surface * surface); |
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150 |
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151 /* |
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152 * Load a surface from a seekable SDL data source (memory or file.) |
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153 * If 'freesrc' is non-zero, the source will be closed after being read. |
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154 * Returns the new surface, or NULL if there was an error. |
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155 * The new surface should be freed with SDL_FreeSurface(). |
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156 */ |
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157 extern DECLSPEC SDL_Surface *SDLCALL SDL_LoadBMP_RW(SDL_RWops * src, |
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158 int freesrc); |
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159 |
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160 /* Convenience macro -- load a surface from a file */ |
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161 #define SDL_LoadBMP(file) SDL_LoadBMP_RW(SDL_RWFromFile(file, "rb"), 1) |
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162 |
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163 /* |
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164 * Save a surface to a seekable SDL data source (memory or file.) |
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165 * If 'freedst' is non-zero, the source will be closed after being written. |
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166 * Returns 0 if successful or -1 if there was an error. |
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167 */ |
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168 extern DECLSPEC int SDLCALL SDL_SaveBMP_RW |
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169 (SDL_Surface * surface, SDL_RWops * dst, int freedst); |
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170 |
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171 /* Convenience macro -- save a surface to a file */ |
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172 #define SDL_SaveBMP(surface, file) \ |
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173 SDL_SaveBMP_RW(surface, SDL_RWFromFile(file, "wb"), 1) |
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174 |
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175 /* |
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176 * \fn int SDL_SetSurfaceRLE(SDL_Surface *surface, int flag) |
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177 * |
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178 * \brief Sets the RLE acceleration hint for a surface. |
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179 * |
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180 * \return 0 on success, or -1 if the surface is not valid |
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181 * |
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182 * \note If RLE is enabled, colorkey and alpha blending blits are much faster, |
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183 * but the surface must be locked before directly accessing the pixels. |
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184 */ |
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185 extern DECLSPEC int SDLCALL SDL_SetSurfaceRLE(SDL_Surface * surface, |
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186 int flag); |
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187 |
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188 /* |
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189 * \fn int SDL_SetColorKey(SDL_Surface *surface, Uint32 flag, Uint32 key) |
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190 * |
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191 * \brief Sets the color key (transparent pixel) in a blittable surface. |
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192 * |
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193 * \param surface The surface to update |
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194 * \param flag Non-zero to enable colorkey and 0 to disable colorkey |
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195 * \param key The transparent pixel in the native surface format |
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196 * |
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197 * \return 0 on success, or -1 if the surface is not valid |
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198 */ |
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199 extern DECLSPEC int SDLCALL SDL_SetColorKey(SDL_Surface * surface, |
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200 Uint32 flag, Uint32 key); |
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201 |
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202 /** |
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203 * \fn int SDL_SetSurfaceColorMod(SDL_Surface *surface, Uint8 r, Uint8 g, Uint8 b) |
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204 * |
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205 * \brief Set an additional color value used in blit operations |
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206 * |
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207 * \param surface The surface to update |
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208 * \param r The red source color value multiplied into blit operations |
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209 * \param g The green source color value multiplied into blit operations |
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210 * \param b The blue source color value multiplied into blit operations |
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211 * |
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212 * \return 0 on success, or -1 if the surface is not valid |
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213 * |
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214 * \sa SDL_GetSurfaceColorMod() |
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215 */ |
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216 extern DECLSPEC int SDLCALL SDL_SetSurfaceColorMod(SDL_Surface * surface, |
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217 Uint8 r, Uint8 g, Uint8 b); |
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218 |
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219 |
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220 /** |
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221 * \fn int SDL_GetSurfaceColorMod(SDL_Surface *surface, Uint8 *r, Uint8 *g, Uint8 *b) |
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222 * |
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223 * \brief Get the additional color value used in blit operations |
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224 * |
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225 * \param surface The surface to query |
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226 * \param r A pointer filled in with the source red color value |
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227 * \param g A pointer filled in with the source green color value |
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228 * \param b A pointer filled in with the source blue color value |
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229 * |
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230 * \return 0 on success, or -1 if the surface is not valid |
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231 * |
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232 * \sa SDL_SetSurfaceColorMod() |
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233 */ |
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234 extern DECLSPEC int SDLCALL SDL_GetSurfaceColorMod(SDL_Surface * surface, |
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235 Uint8 * r, Uint8 * g, |
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236 Uint8 * b); |
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237 |
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238 /** |
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239 * \fn int SDL_SetSurfaceAlphaMod(SDL_Surface *surface, Uint8 alpha) |
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240 * |
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241 * \brief Set an additional alpha value used in blit operations |
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242 * |
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243 * \param surface The surface to update |
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244 * \param alpha The source alpha value multiplied into blit operations. |
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245 * |
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246 * \return 0 on success, or -1 if the surface is not valid |
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247 * |
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248 * \sa SDL_GetSurfaceAlphaMod() |
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249 */ |
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250 extern DECLSPEC int SDLCALL SDL_SetSurfaceAlphaMod(SDL_Surface * surface, |
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251 Uint8 alpha); |
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252 |
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253 /** |
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254 * \fn int SDL_GetSurfaceAlphaMod(SDL_Surface *surface, Uint8 *alpha) |
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255 * |
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256 * \brief Get the additional alpha value used in blit operations |
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257 * |
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258 * \param surface The surface to query |
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259 * \param alpha A pointer filled in with the source alpha value |
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260 * |
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261 * \return 0 on success, or -1 if the surface is not valid |
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262 * |
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263 * \sa SDL_SetSurfaceAlphaMod() |
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264 */ |
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265 extern DECLSPEC int SDLCALL SDL_GetSurfaceAlphaMod(SDL_Surface * surface, |
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266 Uint8 * alpha); |
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267 |
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268 /** |
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269 * \fn int SDL_SetSurfaceBlendMode(SDL_Surface *surface, int blendMode) |
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270 * |
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271 * \brief Set the blend mode used for blit operations |
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272 * |
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273 * \param surface The surface to update |
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274 * \param blendMode SDL_TextureBlendMode to use for blit blending |
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275 * |
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276 * \return 0 on success, or -1 if the parameters are not valid |
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277 * |
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278 * \sa SDL_GetSurfaceBlendMode() |
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279 */ |
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280 extern DECLSPEC int SDLCALL SDL_SetSurfaceBlendMode(SDL_Surface * surface, |
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281 int blendMode); |
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282 |
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283 /** |
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284 * \fn int SDL_GetSurfaceBlendMode(SDL_Surface *surface, int *blendMode) |
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285 * |
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286 * \brief Get the blend mode used for blit operations |
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287 * |
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288 * \param surface The surface to query |
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289 * \param blendMode A pointer filled in with the current blend mode |
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290 * |
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291 * \return 0 on success, or -1 if the surface is not valid |
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292 * |
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293 * \sa SDL_SetSurfaceBlendMode() |
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294 */ |
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295 extern DECLSPEC int SDLCALL SDL_GetSurfaceBlendMode(SDL_Surface * surface, |
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296 int *blendMode); |
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297 |
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298 /** |
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299 * \fn int SDL_SetSurfaceScaleMode(SDL_Surface *surface, int scaleMode) |
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300 * |
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301 * \brief Set the scale mode used for blit operations |
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302 * |
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303 * \param surface The surface to update |
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304 * \param scaleMode SDL_TextureScaleMode to use for blit scaling |
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305 * |
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306 * \return 0 on success, or -1 if the surface is not valid or the scale mode is not supported |
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307 * |
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308 * \note If the scale mode is not supported, the closest supported mode is chosen. Currently only SDL_TEXTURESCALEMODE_FAST is supported on surfaces. |
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309 * |
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310 * \sa SDL_GetSurfaceScaleMode() |
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311 */ |
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312 extern DECLSPEC int SDLCALL SDL_SetSurfaceScaleMode(SDL_Surface * surface, |
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313 int scaleMode); |
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314 |
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315 /** |
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316 * \fn int SDL_GetSurfaceScaleMode(SDL_Surface *surface, int *scaleMode) |
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317 * |
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318 * \brief Get the scale mode used for blit operations |
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319 * |
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320 * \param surface The surface to query |
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321 * \param scaleMode A pointer filled in with the current scale mode |
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322 * |
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323 * \return 0 on success, or -1 if the surface is not valid |
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324 * |
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325 * \sa SDL_SetSurfaceScaleMode() |
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326 */ |
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327 extern DECLSPEC int SDLCALL SDL_GetSurfaceScaleMode(SDL_Surface * surface, |
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328 int *scaleMode); |
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329 |
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330 /* |
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331 * Sets the clipping rectangle for the destination surface in a blit. |
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332 * |
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333 * If the clip rectangle is NULL, clipping will be disabled. |
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334 * If the clip rectangle doesn't intersect the surface, the function will |
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335 * return SDL_FALSE and blits will be completely clipped. Otherwise the |
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336 * function returns SDL_TRUE and blits to the surface will be clipped to |
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337 * the intersection of the surface area and the clipping rectangle. |
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338 * |
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339 * Note that blits are automatically clipped to the edges of the source |
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340 * and destination surfaces. |
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341 */ |
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342 extern DECLSPEC SDL_bool SDLCALL SDL_SetClipRect(SDL_Surface * surface, |
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343 const SDL_Rect * rect); |
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344 |
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345 /* |
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346 * Gets the clipping rectangle for the destination surface in a blit. |
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347 * 'rect' must be a pointer to a valid rectangle which will be filled |
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348 * with the correct values. |
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349 */ |
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350 extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface, |
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351 SDL_Rect * rect); |
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352 |
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353 /* |
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354 * Creates a new surface of the specified format, and then copies and maps |
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355 * the given surface to it so the blit of the converted surface will be as |
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356 * fast as possible. If this function fails, it returns NULL. |
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357 * |
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358 * The 'flags' parameter is passed to SDL_CreateRGBSurface() and has those |
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359 * semantics. You can also pass SDL_RLEACCEL in the flags parameter and |
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360 * SDL will try to RLE accelerate colorkey and alpha blits in the resulting |
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361 * surface. |
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362 * |
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363 * This function is used internally by SDL_DisplayFormat(). |
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364 */ |
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365 extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface |
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366 (SDL_Surface * src, SDL_PixelFormat * fmt, Uint32 flags); |
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367 |
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368 /* |
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369 * This function draws a line with 'color' |
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370 * The color should be a pixel of the format used by the surface, and |
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371 * can be generated by the SDL_MapRGB() function. |
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372 * This function returns 0 on success, or -1 on error. |
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373 */ |
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374 extern DECLSPEC int SDLCALL SDL_DrawLine |
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375 (SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color); |
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376 |
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377 /* |
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378 * This function blends an RGBA value along a line |
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379 * This function returns 0 on success, or -1 on error. |
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380 */ |
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381 extern DECLSPEC int SDLCALL SDL_BlendLine |
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382 (SDL_Surface * dst, int x1, int y1, int x2, int y2, int blendMode, |
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383 Uint8 r, Uint8 g, Uint8 b, Uint8 a); |
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384 |
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385 /* |
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386 * This function performs a fast fill of the given rectangle with 'color' |
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387 * The given rectangle is clipped to the destination surface clip area |
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388 * and the final fill rectangle is saved in the passed in pointer. |
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389 * If 'dstrect' is NULL, the whole surface will be filled with 'color' |
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390 * The color should be a pixel of the format used by the surface, and |
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391 * can be generated by the SDL_MapRGB() function. |
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392 * This function returns 0 on success, or -1 on error. |
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393 */ |
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394 extern DECLSPEC int SDLCALL SDL_FillRect |
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395 (SDL_Surface * dst, SDL_Rect * dstrect, Uint32 color); |
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396 |
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397 /* |
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398 * This function blends an RGBA value into the given rectangle. |
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399 * The given rectangle is clipped to the destination surface clip area |
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400 * and the final fill rectangle is saved in the passed in pointer. |
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401 * If 'dstrect' is NULL, the whole surface will be filled with 'color' |
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402 * This function returns 0 on success, or -1 on error. |
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403 */ |
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404 extern DECLSPEC int SDLCALL SDL_BlendRect |
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405 (SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r, Uint8 g, |
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406 Uint8 b, Uint8 a); |
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407 |
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408 /* |
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409 * This performs a fast blit from the source surface to the destination |
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410 * surface. It assumes that the source and destination rectangles are |
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411 * the same size. If either 'srcrect' or 'dstrect' are NULL, the entire |
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412 * surface (src or dst) is copied. The final blit rectangles are saved |
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413 * in 'srcrect' and 'dstrect' after all clipping is performed. |
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414 * If the blit is successful, it returns 0, otherwise it returns -1. |
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415 * |
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416 * The blit function should not be called on a locked surface. |
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417 * |
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418 * The blit semantics for surfaces with and without alpha and colorkey |
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419 * are defined as follows: |
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420 * |
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421 * RGBA->RGB: |
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422 * SDL_SRCALPHA set: |
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423 * alpha-blend (using alpha-channel). |
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424 * SDL_SRCCOLORKEY ignored. |
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425 * SDL_SRCALPHA not set: |
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426 * copy RGB. |
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427 * if SDL_SRCCOLORKEY set, only copy the pixels matching the |
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428 * RGB values of the source colour key, ignoring alpha in the |
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429 * comparison. |
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|
430 * |
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431 * RGB->RGBA: |
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432 * SDL_SRCALPHA set: |
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433 * alpha-blend (using the source per-surface alpha value); |
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|
434 * set destination alpha to opaque. |
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435 * SDL_SRCALPHA not set: |
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436 * copy RGB, set destination alpha to source per-surface alpha value. |
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|
437 * both: |
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|
438 * if SDL_SRCCOLORKEY set, only copy the pixels matching the |
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|
439 * source colour key. |
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|
440 * |
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|
441 * RGBA->RGBA: |
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442 * SDL_SRCALPHA set: |
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|
443 * alpha-blend (using the source alpha channel) the RGB values; |
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|
444 * leave destination alpha untouched. [Note: is this correct?] |
12ea0fdc0df2
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|
445 * SDL_SRCCOLORKEY ignored. |
12ea0fdc0df2
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|
446 * SDL_SRCALPHA not set: |
12ea0fdc0df2
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|
447 * copy all of RGBA to the destination. |
12ea0fdc0df2
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|
448 * if SDL_SRCCOLORKEY set, only copy the pixels matching the |
12ea0fdc0df2
Split out the SDL_rect and SDL_surface functions into their own headers.
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|
449 * RGB values of the source colour key, ignoring alpha in the |
12ea0fdc0df2
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|
450 * comparison. |
12ea0fdc0df2
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|
451 * |
12ea0fdc0df2
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|
452 * RGB->RGB: |
12ea0fdc0df2
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|
453 * SDL_SRCALPHA set: |
12ea0fdc0df2
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|
454 * alpha-blend (using the source per-surface alpha value). |
12ea0fdc0df2
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|
455 * SDL_SRCALPHA not set: |
12ea0fdc0df2
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|
456 * copy RGB. |
12ea0fdc0df2
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|
457 * both: |
12ea0fdc0df2
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|
458 * if SDL_SRCCOLORKEY set, only copy the pixels matching the |
12ea0fdc0df2
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|
459 * source colour key. |
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460 * |
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461 * If either of the surfaces were in video memory, and the blit returns -2, |
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462 * the video memory was lost, so it should be reloaded with artwork and |
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463 * re-blitted: |
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464 while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) { |
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465 while ( SDL_LockSurface(image) < 0 ) |
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466 Sleep(10); |
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467 -- Write image pixels to image->pixels -- |
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468 SDL_UnlockSurface(image); |
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469 } |
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470 * This happens under DirectX 5.0 when the system switches away from your |
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471 * fullscreen application. The lock will also fail until you have access |
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472 * to the video memory again. |
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473 */ |
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474 /* You should call SDL_BlitSurface() unless you know exactly how SDL |
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475 blitting works internally and how to use the other blit functions. |
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476 */ |
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477 #define SDL_BlitSurface SDL_UpperBlit |
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478 |
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479 /* This is the public blit function, SDL_BlitSurface(), and it performs |
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480 rectangle validation and clipping before passing it to SDL_LowerBlit() |
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481 */ |
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482 extern DECLSPEC int SDLCALL SDL_UpperBlit |
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483 (SDL_Surface * src, SDL_Rect * srcrect, |
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484 SDL_Surface * dst, SDL_Rect * dstrect); |
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485 /* This is a semi-private blit function and it performs low-level surface |
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486 blitting only. |
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487 */ |
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488 extern DECLSPEC int SDLCALL SDL_LowerBlit |
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489 (SDL_Surface * src, SDL_Rect * srcrect, |
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490 SDL_Surface * dst, SDL_Rect * dstrect); |
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491 |
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492 /** |
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493 * \fn int SDL_SoftStretch(SDL_Surface * src, const SDL_Rect * srcrect, SDL_Surface * dst, const SDL_Rect * dstrect) |
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494 * |
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495 * \brief Perform a fast, low quality, stretch blit between two surfaces of the same pixel format. |
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496 * |
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497 * \note This function uses a static buffer, and is not thread-safe. |
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498 */ |
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499 extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src, |
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500 const SDL_Rect * srcrect, |
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501 SDL_Surface * dst, |
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502 const SDL_Rect * dstrect); |
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503 |
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504 /* Ends C function definitions when using C++ */ |
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505 #ifdef __cplusplus |
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506 /* *INDENT-OFF* */ |
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507 } |
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508 /* *INDENT-ON* */ |
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509 #endif |
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510 #include "close_code.h" |
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511 |
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512 #endif /* _SDL_surface_h */ |
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513 |
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514 /* vi: set ts=4 sw=4 expandtab: */ |