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[SDL] Bad math in SDL_RenderCopy Mason Wheeler to sdl When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this: if (dstrect->w != real_dstrect.w) { int deltax = (dstrect->x - real_dstrect.x); int deltaw = (dstrect->w - real_dstrect.w); real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w; real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w; } if (dstrect->h != real_dstrect.h) { int deltay = (dstrect->y - real_dstrect.y); int deltah = (dstrect->h - real_dstrect.h); real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h; real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author Sam Lantinga <slouken@libsdl.org>
date Sat, 03 Oct 2009 16:23:16 +0000
parents 99210400e8b9
children f7b03b6838cb
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"


#ifndef __SDL_SYS_YUV_H__
#define __SDL_SYS_YUV_H__

/* This is the BeOS implementation of YUV video overlays */

#include "SDL_video.h"
#include "SDL_lowvideo.h"

extern "C"
{

    struct private_yuvhwdata
    {
/*  FRAMEDATA* CurrentFrameData;
    FRAMEDATA* FrameData0;
    FRAMEDATA* FrameData1;
    PgScalerProps_t   props;
    PgScalerCaps_t    caps;
    PgVideoChannel_t* channel;
    PhArea_t CurrentViewPort;
    PhPoint_t CurrentWindowPos;
    long format;
    int scaler_on;
    int current;
    long YStride;
    long VStride;
    long UStride;
    int ischromakey;
    long chromakey;
    int forcedredraw;
    unsigned long State;
    long flags;
*/
        SDL_Surface *display;
        BView *bview;
        bool first_display;
        BBitmap *bbitmap;
        int locked;
    };

    extern BBitmap *BE_GetOverlayBitmap(BRect bounds, color_space cs);
    extern SDL_Overlay *BE_CreateYUVOverlay(_THIS, int width, int height,
                                            Uint32 format,
                                            SDL_Surface * display);
    extern int BE_LockYUVOverlay(_THIS, SDL_Overlay * overlay);
    extern void BE_UnlockYUVOverlay(_THIS, SDL_Overlay * overlay);
    extern int BE_DisplayYUVOverlay(_THIS, SDL_Overlay * overlay,
                                    SDL_Rect * src, SDL_Rect * dst);
    extern void BE_FreeYUVOverlay(_THIS, SDL_Overlay * overlay);

};

#endif /* __SDL_PH_YUV_H__ */
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