annotate include/SDL_surface.h @ 2807:365fe1a2aad5

The SDL_RLEACCEL flag is respected in SDL_ConvertSurface(), per the docs. Fixed saving BMP files of surfaces with an alpha channel.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Nov 2008 11:26:01 +0000
parents 12ea0fdc0df2
children 7e5ff6cd05bf
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
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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 performs a fast fill of the given rectangle with 'color'
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370 * The given rectangle is clipped to the destination surface clip area
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371 * and the final fill rectangle is saved in the passed in pointer.
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372 * If 'dstrect' is NULL, the whole surface will be filled with 'color'
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373 * The color should be a pixel of the format used by the surface, and
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374 * can be generated by the SDL_MapRGB() function.
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375 * This function returns 0 on success, or -1 on error.
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376 */
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377 extern DECLSPEC int SDLCALL SDL_FillRect
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378 (SDL_Surface * dst, SDL_Rect * dstrect, Uint32 color);
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379
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380 /*
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381 * This performs a fast blit from the source surface to the destination
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382 * surface. It assumes that the source and destination rectangles are
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383 * the same size. If either 'srcrect' or 'dstrect' are NULL, the entire
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384 * surface (src or dst) is copied. The final blit rectangles are saved
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385 * in 'srcrect' and 'dstrect' after all clipping is performed.
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386 * If the blit is successful, it returns 0, otherwise it returns -1.
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387 *
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388 * The blit function should not be called on a locked surface.
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389 *
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390 * The blit semantics for surfaces with and without alpha and colorkey
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391 * are defined as follows:
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392 *
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393 * RGBA->RGB:
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394 * SDL_SRCALPHA set:
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395 * alpha-blend (using alpha-channel).
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396 * SDL_SRCCOLORKEY ignored.
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397 * SDL_SRCALPHA not set:
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398 * copy RGB.
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399 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
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400 * RGB values of the source colour key, ignoring alpha in the
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401 * comparison.
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402 *
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403 * RGB->RGBA:
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404 * SDL_SRCALPHA set:
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405 * alpha-blend (using the source per-surface alpha value);
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406 * set destination alpha to opaque.
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407 * SDL_SRCALPHA not set:
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408 * copy RGB, set destination alpha to source per-surface alpha value.
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409 * both:
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410 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
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411 * source colour key.
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412 *
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413 * RGBA->RGBA:
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414 * SDL_SRCALPHA set:
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415 * alpha-blend (using the source alpha channel) the RGB values;
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416 * leave destination alpha untouched. [Note: is this correct?]
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417 * SDL_SRCCOLORKEY ignored.
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418 * SDL_SRCALPHA not set:
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419 * copy all of RGBA to the destination.
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420 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
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421 * RGB values of the source colour key, ignoring alpha in the
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422 * comparison.
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423 *
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424 * RGB->RGB:
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425 * SDL_SRCALPHA set:
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426 * alpha-blend (using the source per-surface alpha value).
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427 * SDL_SRCALPHA not set:
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428 * copy RGB.
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429 * both:
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430 * if SDL_SRCCOLORKEY set, only copy the pixels matching the
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431 * source colour key.
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432 *
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433 * If either of the surfaces were in video memory, and the blit returns -2,
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434 * the video memory was lost, so it should be reloaded with artwork and
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435 * re-blitted:
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436 while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) {
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437 while ( SDL_LockSurface(image) < 0 )
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438 Sleep(10);
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439 -- Write image pixels to image->pixels --
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440 SDL_UnlockSurface(image);
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441 }
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442 * This happens under DirectX 5.0 when the system switches away from your
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443 * fullscreen application. The lock will also fail until you have access
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444 * to the video memory again.
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445 */
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446 /* You should call SDL_BlitSurface() unless you know exactly how SDL
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447 blitting works internally and how to use the other blit functions.
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448 */
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449 #define SDL_BlitSurface SDL_UpperBlit
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450
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451 /* This is the public blit function, SDL_BlitSurface(), and it performs
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452 rectangle validation and clipping before passing it to SDL_LowerBlit()
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453 */
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454 extern DECLSPEC int SDLCALL SDL_UpperBlit
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455 (SDL_Surface * src, SDL_Rect * srcrect,
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456 SDL_Surface * dst, SDL_Rect * dstrect);
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457 /* This is a semi-private blit function and it performs low-level surface
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458 blitting only.
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459 */
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460 extern DECLSPEC int SDLCALL SDL_LowerBlit
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461 (SDL_Surface * src, SDL_Rect * srcrect,
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462 SDL_Surface * dst, SDL_Rect * dstrect);
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463
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464 /**
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465 * \fn int SDL_SoftStretch(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect)
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466 *
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467 * \brief Perform a fast, low quality, stretch blit between two surfaces of the same pixel format.
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468 *
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469 * \note This function uses a static buffer, and is not thread-safe.
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470 */
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471 extern DECLSPEC int SDLCALL SDL_SoftStretch(SDL_Surface * src,
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472 SDL_Rect * srcrect,
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473 SDL_Surface * dst,
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474 SDL_Rect * dstrect);
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475
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476 /* Ends C function definitions when using C++ */
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477 #ifdef __cplusplus
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478 /* *INDENT-OFF* */
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479 }
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480 /* *INDENT-ON* */
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481 #endif
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482 #include "close_code.h"
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483
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484 #endif /* _SDL_surface_h */
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485
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486 /* vi: set ts=4 sw=4 expandtab: */