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      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2014 Sam Lantinga <slouken (at) libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 
     22 /**
     23  *  \file SDL_blendmode.h
     24  *
     25  *  Header file declaring the SDL_BlendMode enumeration
     26  */
     27 
     28 #ifndef _SDL_blendmode_h
     29 #define _SDL_blendmode_h
     30 
     31 #include "begin_code.h"
     32 /* Set up for C function definitions, even when using C++ */
     33 #ifdef __cplusplus
     34 extern "C" {
     35 #endif
     36 
     37 /**
     38  *  \brief The blend mode used in SDL_RenderCopy() and drawing operations.
     39  */
     40 typedef enum
     41 {
     42     SDL_BLENDMODE_NONE = 0x00000000,     /**< no blending
     43                                               dstRGBA = srcRGBA */
     44     SDL_BLENDMODE_BLEND = 0x00000001,    /**< alpha blending
     45                                               dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA))
     46                                               dstA = srcA + (dstA * (1-srcA)) */
     47     SDL_BLENDMODE_ADD = 0x00000002,      /**< additive blending
     48                                               dstRGB = (srcRGB * srcA) + dstRGB
     49                                               dstA = dstA */
     50     SDL_BLENDMODE_MOD = 0x00000004       /**< color modulate
     51                                               dstRGB = srcRGB * dstRGB
     52                                               dstA = dstA */
     53 } SDL_BlendMode;
     54 
     55 /* Ends C function definitions when using C++ */
     56 #ifdef __cplusplus
     57 }
     58 #endif
     59 #include "close_code.h"
     60 
     61 #endif /* _SDL_video_h */
     62 
     63 /* vi: set ts=4 sw=4 expandtab: */
     64