src/render/SDL_yuv_sw_c.h
author Sam Lantinga
Sun, 12 Nov 2017 22:51:12 -0800
changeset 11702 cf166abbde4a
parent 11195 0d399e95168b
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Updated SDL's YUV support, many thanks to Adrien Descamps

New functions get and set the YUV colorspace conversion mode:
SDL_SetYUVConversionMode()
SDL_GetYUVConversionMode()
SDL_GetYUVConversionModeForResolution()

SDL_ConvertPixels() converts between all supported RGB and YUV formats, with SSE acceleration for converting from planar YUV formats (YV12, NV12, etc) to common RGB/RGBA formats.

Added a new test program, testyuv, to verify correctness and speed of YUV conversion functionality.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#include "SDL_video.h"
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/* This is the software implementation of the YUV texture support */
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struct SDL_SW_YUVTexture
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{
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    Uint32 format;
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    Uint32 target_format;
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    int w, h;
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    Uint8 *pixels;
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    /* These are just so we don't have to allocate them separately */
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    Uint16 pitches[3];
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    Uint8 *planes[3];
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    /* This is a temporary surface in case we have to stretch copy */
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    SDL_Surface *stretch;
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    SDL_Surface *display;
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};
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typedef struct SDL_SW_YUVTexture SDL_SW_YUVTexture;
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SDL_SW_YUVTexture *SDL_SW_CreateYUVTexture(Uint32 format, int w, int h);
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int SDL_SW_QueryYUVTexturePixels(SDL_SW_YUVTexture * swdata, void **pixels,
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                                 int *pitch);
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int SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
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                            const void *pixels, int pitch);
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int SDL_SW_UpdateYUVTexturePlanar(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
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                                  const Uint8 *Yplane, int Ypitch,
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                                  const Uint8 *Uplane, int Upitch,
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                                  const Uint8 *Vplane, int Vpitch);
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int SDL_SW_LockYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
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                          void **pixels, int *pitch);
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void SDL_SW_UnlockYUVTexture(SDL_SW_YUVTexture * swdata);
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int SDL_SW_CopyYUVToRGB(SDL_SW_YUVTexture * swdata, const SDL_Rect * srcrect,
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                        Uint32 target_format, int w, int h, void *pixels,
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                        int pitch);
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void SDL_SW_DestroyYUVTexture(SDL_SW_YUVTexture * swdata);
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/* FIXME: This breaks on various versions of GCC and should be rewritten using intrinsics */
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#if 0 /* (__GNUC__ > 2) && defined(__i386__) && __OPTIMIZE__ && SDL_ASSEMBLY_ROUTINES && !defined(__clang__) */
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#define USE_MMX_ASSEMBLY 1
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#endif
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/* vi: set ts=4 sw=4 expandtab: */