include/SDL_blendmode.h
author Ryan C. Gordon <icculus@icculus.org>
Mon, 08 Sep 2014 01:36:22 -0400
changeset 9126 08f3b56969b1
parent 8149 681eb46b8ac4
child 9239 4a4293b8a37f
permissions -rw-r--r--
Deal with various .bmp file format variants in SDL_LoadBMP_RW().

This helps when modern versions of The Gimp (and lots of other things)
produces a 32-bit bitmap with an alpha channel, or anything with "BI_BITFIELDS"
format, since that data is now embedded in the bitmap info header instead of
directly following it and we would accidentally skip over embedded versions of
it.

Fixes Bugzilla #2714.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2014 Sam Lantinga <slouken@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: */