Remove most unused files.

4 files changed, 0 insertions, 2396 deletions

diff --git a/src/sdl2gfx/SDL2_framerate.cpp b/src/sdl2gfx/SDL2_framerate.cpp
deleted file mode 100644
index e03a8ba7c..000000000
--- a/src/sdl2gfx/SDL2_framerate.cpp
+++ /dev/null
@@ -1,211 +0,0 @@
-/*
-
-SDL2_framerate.c: framerate manager
-
-Copyright (C) 2012-2014  Andreas Schiffler
-
-This software is provided 'as-is', without any express or implied
-warranty. In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-claim that you wrote the original software. If you use this software
-in a product, an acknowledgment in the product documentation would be
-appreciated but is not required.
-
-2. Altered source versions must be plainly marked as such, and must not be
-misrepresented as being the original software.
-
-3. This notice may not be removed or altered from any source
-distribution.
-
-Andreas Schiffler -- aschiffler at ferzkopp dot net
-
-Changed for ManaPlus (C) 2013-2017  ManaPlus developers
-
-*/
-
-#include "sdl2gfx/SDL2_framerate.h"
-
-#include "debug.h"
-
-/*!
-\brief Internal wrapper to SDL_GetTicks that ensures a non-zero return value.
-
-\return The tick count.
-*/
-static Uint32 _getTicks()
-{
-    Uint32 ticks = SDL_GetTicks();
-
-    /*
-    * Since baseticks!=0 is used to track initialization
-    * we need to ensure that the tick count is always >0
-    * since SDL_GetTicks may not have incremented yet and
-    * return 0 depending on the timing of the calls.
-    */
-    if (ticks == 0)
-    {
-        return 1;
-    }
-    else
-    {
-        return ticks;
-    }
-}
-
-/*!
-\brief Initialize the framerate manager.
-
-Initialize the framerate manager, set default framerate of 30Hz and
-reset delay interpolation.
-
-\param manager Pointer to the framerate manager.
-*/
-void SDL_initFramerate(FPSmanager * manager)
-{
-    /*
-    * Store some sane values
-    */
-    manager->framecount = 0;
-    manager->rate = FPS_DEFAULT;
-    manager->rateticks = (1000.0f / static_cast<float>(FPS_DEFAULT));
-    manager->baseticks = _getTicks();
-    manager->lastticks = manager->baseticks;
-
-}
-
-/*!
-\brief Set the framerate in Hz
-
-Sets a new framerate for the manager and reset delay interpolation.
-Rate values must be between FPS_LOWER_LIMIT and FPS_UPPER_LIMIT inclusive to be accepted.
-
-\param manager Pointer to the framerate manager.
-\param rate The new framerate in Hz (frames per second).
-
-\return 0 for sucess and -1 for error.
-*/
-int SDL_setFramerate(FPSmanager * manager, Uint32 rate)
-{
-    if ((rate >= FPS_LOWER_LIMIT) && (rate <= FPS_UPPER_LIMIT))
-    {
-        manager->framecount = 0;
-        manager->rate = rate;
-        manager->rateticks = (1000.0f / static_cast<float>(rate));
-        return (0);
-    }
-    else
-    {
-        return (-1);
-    }
-}
-
-/*!
-\brief Return the current target framerate in Hz
-
-Get the currently set framerate of the manager.
-
-\param manager Pointer to the framerate manager.
-
-\return Current framerate in Hz or -1 for error.
-*/
-int SDL_getFramerate(FPSmanager * manager)
-{
-    if (manager == nullptr)
-    {
-        return (-1);
-    }
-    else
-    {
-        return (static_cast<int>(manager->rate));
-    }
-}
-
-/*!
-\brief Return the current framecount.
-
-Get the current framecount from the framerate manager.
-A frame is counted each time SDL_framerateDelay is called.
-
-\param manager Pointer to the framerate manager.
-
-\return Current frame count or -1 for error.
-*/
-int SDL_getFramecount(FPSmanager * manager)
-{
-    if (manager == nullptr)
-    {
-        return (-1);
-    }
-    else
-    {
-        return (static_cast<int>(manager->framecount));
-    }
-}
-
-/*!
-\brief Delay execution to maintain a constant framerate and calculate fps.
-
-Generate a delay to accomodate currently set framerate. Call once in the
-graphics/rendering loop. If the computer cannot keep up with the rate (i.e.
-drawing too slow), the delay is zero and the delay interpolation is reset.
-
-\param manager Pointer to the framerate manager.
-
-\return The time that passed since the last call to the function in ms. May return 0.
-*/
-Uint32 SDL_framerateDelay(FPSmanager * manager)
-{
-    Uint32 current_ticks;
-    Uint32 target_ticks;
-    Uint32 the_delay;
-    Uint32 time_passed = 0;
-
-    /*
-    * No manager, no delay
-    */
-    if (manager == nullptr)
-    {
-        return 0;
-    }
-
-    /*
-    * Initialize uninitialized manager
-    */
-    if (manager->baseticks == 0)
-    {
-        SDL_initFramerate(manager);
-    }
-
-    /*
-    * Next frame
-    */
-    manager->framecount++;
-
-    /*
-    * Get/calc ticks
-    */
-    current_ticks = _getTicks();
-    time_passed = current_ticks - manager->lastticks;
-    manager->lastticks = current_ticks;
-    target_ticks = manager->baseticks + static_cast<Uint32>(static_cast<float>(
-        manager->framecount) * manager->rateticks);
-
-    if (current_ticks <= target_ticks)
-    {
-        the_delay = target_ticks - current_ticks;
-        SDL_Delay(the_delay);
-    }
-    else
-    {
-        manager->framecount = 0;
-        manager->baseticks = _getTicks();
-    }
-
-    return time_passed;
-}
diff --git a/src/sdl2gfx/SDL2_framerate.h b/src/sdl2gfx/SDL2_framerate.h
deleted file mode 100644
index add1b28c9..000000000
--- a/src/sdl2gfx/SDL2_framerate.h
+++ /dev/null
@@ -1,110 +0,0 @@
-/*
-
-SDL2_framerate.h: framerate manager
-
-Copyright (C) 2012-2014  Andreas Schiffler
-
-This software is provided 'as-is', without any express or implied
-warranty. In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-claim that you wrote the original software. If you use this software
-in a product, an acknowledgment in the product documentation would be
-appreciated but is not required.
-
-2. Altered source versions must be plainly marked as such, and must not be
-misrepresented as being the original software.
-
-3. This notice may not be removed or altered from any source
-distribution.
-
-Andreas Schiffler -- aschiffler at ferzkopp dot net
-
-Changed for ManaPlus (C) 2013-2017  ManaPlus developers
-
-*/
-
-#ifndef _SDL2_framerate_h
-#define _SDL2_framerate_h
-
-/* Set up for C function definitions, even when using C++ */
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-    /* --- */
-
-#include "localconsts.h"
-
-PRAGMA48(GCC diagnostic push)
-PRAGMA48(GCC diagnostic ignored "-Wshadow")
-#include <SDL.h>
-PRAGMA48(GCC diagnostic pop)
-
-    /* --------- Definitions */
-
-    /*!
-    \brief Highest possible rate supported by framerate controller in Hz (1/s).
-    */
-#define FPS_UPPER_LIMIT        200
-
-    /*!
-    \brief Lowest possible rate supported by framerate controller in Hz (1/s).
-    */
-#define FPS_LOWER_LIMIT        1
-
-    /*!
-    \brief Default rate of framerate controller in Hz (1/s).
-    */
-#define FPS_DEFAULT        30
-
-    /*!
-    \brief Structure holding the state and timing information of the framerate controller.
-    */
-    typedef struct
-    {
-        Uint32 framecount;
-        float rateticks;
-        Uint32 baseticks;
-        Uint32 lastticks;
-        Uint32 rate;
-    } FPSmanager;
-
-    /* ---- Function Prototypes */
-
-#ifdef _MSC_VER
-#  if defined(DLL_EXPORT) && !defined(LIBSDL2_GFX_DLL_IMPORT)
-#    define SDL2_FRAMERATE_SCOPE __declspec(dllexport)
-#  else
-#    ifdef LIBSDL2_GFX_DLL_IMPORT
-#      define SDL2_FRAMERATE_SCOPE __declspec(dllimport)
-#    endif
-#  endif
-#endif
-#ifndef SDL2_FRAMERATE_SCOPE
-#  define SDL2_FRAMERATE_SCOPE extern
-#endif
-
-    /* Functions return 0 or value for sucess and -1 for error */
-
-    SDL2_FRAMERATE_SCOPE void SDL_initFramerate(FPSmanager * manager);
-    SDL2_FRAMERATE_SCOPE int SDL_setFramerate(FPSmanager * manager,
-                                              Uint32 rate);
-    SDL2_FRAMERATE_SCOPE int SDL_getFramerate(FPSmanager * manager);
-    SDL2_FRAMERATE_SCOPE int SDL_getFramecount(FPSmanager * manager);
-    SDL2_FRAMERATE_SCOPE Uint32 SDL_framerateDelay(FPSmanager * manager);
-
-    /* --- */
-
-    /* Ends C function definitions when using C++ */
-#ifdef __cplusplus
-}
-#endif
-
-#endif                /* _SDL2_framerate_h */
diff --git a/src/sdl2gfx/SDL2_rotozoom.cpp b/src/sdl2gfx/SDL2_rotozoom.cpp
deleted file mode 100644
index a37e1c51e..000000000
--- a/src/sdl2gfx/SDL2_rotozoom.cpp
+++ /dev/null
@@ -1,1944 +0,0 @@
-/*
-
-SDL2_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces
-
-Copyright (C) 2012-2014  Andreas Schiffler
-
-This software is provided 'as-is', without any express or implied
-warranty. In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-claim that you wrote the original software. If you use this software
-in a product, an acknowledgment in the product documentation would be
-appreciated but is not required.
-
-2. Altered source versions must be plainly marked as such, and must not be
-misrepresented as being the original software.
-
-3. This notice may not be removed or altered from any source
-distribution.
-
-Andreas Schiffler -- aschiffler at ferzkopp dot net
-
-Changed for ManaPlus (C) 2013-2017  ManaPlus developers
-
-*/
-
-#ifdef WIN32
-#include <windows.h>
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-
-#include "sdl2gfx/SDL2_rotozoom.h"
-
-#include "debug.h"
-
-/* ---- Internally used structures */
-
-/*!
-\brief A 32 bit RGBA pixel.
-*/
-typedef struct tColorRGBA
-{
-    Uint8 r;
-    Uint8 g;
-    Uint8 b;
-    Uint8 a;
-} tColorRGBA;
-
-/*!
-\brief A 8bit Y/palette pixel.
-*/
-typedef struct tColorY
-{
-    Uint8 y;
-} tColorY;
-
-/*!
-\brief Returns maximum of two numbers a and b.
-*/
-#define MAX(a,b)    (((a) > (b)) ? (a) : (b))
-
-/*!
-\brief Number of guard rows added to destination surfaces.
-
-This is a simple but effective workaround for observed issues.
-These rows allocate extra memory and are then hidden from the surface.
-Rows are added to the end of destination surfaces when they are allocated.
-This catches any potential overflows which seem to happen with
-just the right src image dimensions and scale/rotation and can lead
-to a situation where the program can segfault.
-*/
-#define GUARD_ROWS (2)
-
-/*!
-\brief Lower limit of absolute zoom factor or rotation degrees.
-*/
-#define VALUE_LIMIT    0.001
-
-/*!
-\brief Returns colorkey info for a surface
-*/
-static Uint32 _colorkey(SDL_Surface *src)
-{
-    Uint32 key = 0;
-    SDL_GetColorKey(src, &key);
-    return key;
-}
-
-
-/*!
-\brief Internal 32 bit integer-factor averaging Shrinker.
-
-Shrinks 32 bit RGBA/ABGR 'src' surface to 'dst' surface.
-Averages color and alpha values values of src pixels to calculate dst pixels.
-Assumes src and dst surfaces are of 32 bit depth.
-Assumes dst surface was allocated with the correct dimensions.
-
-\param src The surface to shrink (input).
-\param dst The shrunken surface (output).
-\param factorx The horizontal shrinking ratio.
-\param factory The vertical shrinking ratio.
-
-\return 0 for success or -1 for error.
-*/
-static int _shrinkSurfaceRGBA(SDL_Surface *src,
-                              SDL_Surface *dst,
-                              int factorx,
-                              int factory)
-{
-    int x, y, dx, dy, dgap, ra, ga, ba, aa;
-    int n_average;
-    tColorRGBA *sp, *osp, *oosp;
-    tColorRGBA *dp;
-
-    /*
-    * Averaging integer shrink
-    */
-
-    /* Precalculate division factor */
-    n_average = factorx*factory;
-
-    /*
-    * Scan destination
-    */
-    sp = static_cast<tColorRGBA *>(src->pixels);
-
-    dp = static_cast<tColorRGBA *>(dst->pixels);
-    dgap = dst->pitch - dst->w * 4;
-
-    for (y = 0; y < dst->h; y++)
-    {
-        osp=sp;
-        for (x = 0; x < dst->w; x++)
-        {
-            /* Trace out source box and accumulate */
-            oosp=sp;
-            ra=ga=ba=aa=0;
-            for (dy=0; dy < factory; dy++)
-            {
-                for (dx=0; dx < factorx; dx++)
-                {
-                    ra += sp->r;
-                    ga += sp->g;
-                    ba += sp->b;
-                    aa += sp->a;
-
-                    sp++;
-                }
-                /* src dx loop */
-                sp = reinterpret_cast<tColorRGBA *>(
-                    reinterpret_cast<Uint8*>(sp) +
-                    (src->pitch - 4*factorx)); // next y
-            }
-            /* src dy loop */
-
-            /* next box-x */
-            sp = reinterpret_cast<tColorRGBA *>(
-                reinterpret_cast<Uint8*>(oosp) + 4*factorx);
-
-            /* Store result in destination */
-            dp->r = ra/n_average;
-            dp->g = ga/n_average;
-            dp->b = ba/n_average;
-            dp->a = aa/n_average;
-
-            /*
-            * Advance destination pointer
-            */
-            dp++;
-        }
-        /* dst x loop */
-
-        /* next box-y */
-        sp = reinterpret_cast<tColorRGBA *>(reinterpret_cast<Uint8*>(osp) +
-            src->pitch*factory);
-
-        /*
-        * Advance destination pointers
-        */
-        dp = reinterpret_cast<tColorRGBA *>(reinterpret_cast<Uint8*>(dp) +
-            dgap);
-    }
-    /* dst y loop */
-
-    return (0);
-}
-
-/*!
-\brief Internal 8 bit integer-factor averaging shrinker.
-
-Shrinks 8bit Y 'src' surface to 'dst' surface.
-Averages color (brightness) values values of src pixels to calculate dst pixels.
-Assumes src and dst surfaces are of 8 bit depth.
-Assumes dst surface was allocated with the correct dimensions.
-
-\param src The surface to shrink (input).
-\param dst The shrunken surface (output).
-\param factorx The horizontal shrinking ratio.
-\param factory The vertical shrinking ratio.
-
-\return 0 for success or -1 for error.
-*/
-static int _shrinkSurfaceY(SDL_Surface *src,
-                           SDL_Surface *dst,
-                           int factorx,
-                           int factory)
-{
-    int x, y, dx, dy, dgap, a;
-    int n_average;
-    Uint8 *sp, *osp, *oosp;
-    Uint8 *dp;
-
-    /*
-    * Averaging integer shrink
-    */
-
-    /* Precalculate division factor */
-    n_average = factorx*factory;
-
-    /*
-    * Scan destination
-    */
-    sp = static_cast<Uint8*>(src->pixels);
-
-    dp = static_cast<Uint8*>(dst->pixels);
-    dgap = dst->pitch - dst->w;
-
-    for (y = 0; y < dst->h; y++)
-    {
-        osp=sp;
-        for (x = 0; x < dst->w; x++)
-        {
-            /* Trace out source box and accumulate */
-            oosp=sp;
-            a=0;
-            for (dy=0; dy < factory; dy++)
-            {
-                for (dx=0; dx < factorx; dx++)
-                {
-                    a += (*sp);
-                    /* next x */
-                    sp++;
-                }
-                /* end src dx loop */
-                /* next y */
-                sp = static_cast<Uint8*>(static_cast<Uint8*>(sp) +
-                    (src->pitch - factorx));
-            }
-            /* end src dy loop */
-
-            /* next box-x */
-            sp = static_cast<Uint8*>(static_cast<Uint8*>(oosp) + factorx);
-
-            /* Store result in destination */
-            *dp = a/n_average;
-
-            /*
-            * Advance destination pointer
-            */
-            dp++;
-        }
-        /* end dst x loop */
-
-        /* next box-y */
-        sp = static_cast<Uint8*>(static_cast<Uint8*>(osp) +
-            src->pitch*factory);
-
-        /*
-        * Advance destination pointers
-        */
-        dp = static_cast<Uint8*>(static_cast<Uint8*>(dp) + dgap);
-    }
-    /* end dst y loop */
-
-    return (0);
-}
-
-/*!
-\brief Internal 32 bit Zoomer with optional anti-aliasing by bilinear interpolation.
-
-Zooms 32 bit RGBA/ABGR 'src' surface to 'dst' surface.
-Assumes src and dst surfaces are of 32 bit depth.
-Assumes dst surface was allocated with the correct dimensions.
-
-\param src The surface to zoom (input).
-\param dst The zoomed surface (output).
-\param flipx Flag indicating if the image should be horizontally flipped.
-\param flipy Flag indicating if the image should be vertically flipped.
-\param smooth Antialiasing flag; set to SMOOTHING_ON to enable.
-
-\return 0 for success or -1 for error.
-*/
-static int _zoomSurfaceRGBA(SDL_Surface *src,
-                            SDL_Surface *dst,
-                            int flipx,
-                            int flipy,
-                            int smooth)
-{
-    int x, y, sx, sy, ssx, ssy;
-    int *sax, *say, *csax, *csay, *salast;
-    int csx, csy, ex, ey, cx, cy, sstep, sstepx, sstepy;
-    tColorRGBA *c00, *c01, *c10, *c11;
-    tColorRGBA *sp, *csp, *dp;
-    int spixelgap, spixelw, spixelh, dgap, t1, t2;
-
-    /*
-    * Allocate memory for row/column increments
-    */
-    if ((sax = static_cast<int *>(malloc((dst->w + 1) * sizeof(Uint32)))) == nullptr)
-    {
-        return (-1);
-    }
-    if ((say = static_cast<int *>(malloc((dst->h + 1) * sizeof(Uint32)))) == nullptr)
-    {
-        free(sax);
-        return (-1);
-    }
-
-    /*
-    * Precalculate row increments
-    */
-    spixelw = (src->w - 1);
-    spixelh = (src->h - 1);
-    if (smooth)
-    {
-        sx = static_cast<int>(65536.0 * static_cast<float>(spixelw) /
-            static_cast<float>(dst->w - 1));
-        sy = static_cast<int>(65536.0 * static_cast<float>(spixelh) /
-            static_cast<float>(dst->h - 1));
-    }
-    else
-    {
-        sx = static_cast<int>(65536.0 * static_cast<float>(src->w) /
-            static_cast<float>(dst->w));
-        sy = static_cast<int>(65536.0 * static_cast<float>(src->h) /
-            static_cast<float>(dst->h));
-    }
-
-    /* Maximum scaled source size */
-    ssx = (src->w << 16) - 1;
-    ssy = (src->h << 16) - 1;
-
-    /* Precalculate horizontal row increments */
-    csx = 0;
-    csax = sax;
-    for (x = 0; x <= dst->w; x++)
-    {
-        *csax = csx;
-        csax++;
-        csx += sx;
-
-        /* Guard from overflows */
-        if (csx > ssx)
-        {
-            csx = ssx;
-        }
-    }
-
-    /* Precalculate vertical row increments */
-    csy = 0;
-    csay = say;
-    for (y = 0; y <= dst->h; y++)
-    {
-        *csay = csy;
-        csay++;
-        csy += sy;
-
-        /* Guard from overflows */
-        if (csy > ssy)
-        {
-            csy = ssy;
-        }
-    }
-
-    sp = static_cast<tColorRGBA *>(src->pixels);
-    dp = static_cast<tColorRGBA *>(dst->pixels);
-    dgap = dst->pitch - dst->w * 4;
-    spixelgap = src->pitch/4;
-
-    if (flipx) sp += spixelw;
-    if (flipy) sp += (spixelgap * spixelh);
-
-    /*
-    * Switch between interpolating and non-interpolating code
-    */
-    if (smooth)
-    {
-        /*
-        * Interpolating Zoom
-        */
-        csay = say;
-        for (y = 0; y < dst->h; y++)
-        {
-            csp = sp;
-            csax = sax;
-            for (x = 0; x < dst->w; x++)
-            {
-                /*
-                * Setup color source pointers
-                */
-                ex = (*csax & 0xffff);
-                ey = (*csay & 0xffff);
-                cx = (*csax >> 16);
-                cy = (*csay >> 16);
-                sstepx = cx < spixelw;
-                sstepy = cy < spixelh;
-                c00 = sp;
-                c01 = sp;
-                c10 = sp;
-                if (sstepy)
-                {
-                    if (flipy)
-                    {
-                        c10 -= spixelgap;
-                    }
-                    else
-                    {
-                        c10 += spixelgap;
-                    }
-                }
-                c11 = c10;
-                if (sstepx)
-                {
-                    if (flipx)
-                    {
-                        c01--;
-                        c11--;
-                    }
-                    else
-                    {
-                        c01++;
-                        c11++;
-                    }
-                }
-
-                /*
-                * Draw and interpolate colors
-                */
-                t1 = ((((c01->r - c00->r) * ex) >> 16) + c00->r) & 0xff;
-                t2 = ((((c11->r - c10->r) * ex) >> 16) + c10->r) & 0xff;
-                dp->r = (((t2 - t1) * ey) >> 16) + t1;
-                t1 = ((((c01->g - c00->g) * ex) >> 16) + c00->g) & 0xff;
-                t2 = ((((c11->g - c10->g) * ex) >> 16) + c10->g) & 0xff;
-                dp->g = (((t2 - t1) * ey) >> 16) + t1;
-                t1 = ((((c01->b - c00->b) * ex) >> 16) + c00->b) & 0xff;
-                t2 = ((((c11->b - c10->b) * ex) >> 16) + c10->b) & 0xff;
-                dp->b = (((t2 - t1) * ey) >> 16) + t1;
-                t1 = ((((c01->a - c00->a) * ex) >> 16) + c00->a) & 0xff;
-                t2 = ((((c11->a - c10->a) * ex) >> 16) + c10->a) & 0xff;
-                dp->a = (((t2 - t1) * ey) >> 16) + t1;
-                /*
-                * Advance source pointer x
-                */
-                salast = csax;
-                csax++;
-                sstep = (*csax >> 16) - (*salast >> 16);
-                if (flipx)
-                {
-                    sp -= sstep;
-                }
-                else
-                {
-                    sp += sstep;
-                }
-
-                /*
-                * Advance destination pointer x
-                */
-                dp++;
-            }
-            /*
-            * Advance source pointer y
-            */
-            salast = csay;
-            csay++;
-            sstep = (*csay >> 16) - (*salast >> 16);
-            sstep *= spixelgap;
-            if (flipy)
-            {
-                sp = csp - sstep;
-            }
-            else
-            {
-                sp = csp + sstep;
-            }
-
-            /*
-            * Advance destination pointer y
-            */
-            dp = reinterpret_cast<tColorRGBA *>(
-                reinterpret_cast<Uint8*>(dp) + dgap);
-        }
-    }
-    else
-    {
-        /*
-        * Non-Interpolating Zoom
-        */
-        csay = say;
-        for (y = 0; y < dst->h; y++)
-        {
-            csp = sp;
-            csax = sax;
-            for (x = 0; x < dst->w; x++)
-            {
-                /*
-                * Draw
-                */
-                *dp = *sp;
-
-                /*
-                * Advance source pointer x
-                */
-                salast = csax;
-                csax++;
-                sstep = (*csax >> 16) - (*salast >> 16);
-                if (flipx) sstep = -sstep;
-                sp += sstep;
-
-                /*
-                * Advance destination pointer x
-                */
-                dp++;
-            }
-            /*
-            * Advance source pointer y
-            */
-            salast = csay;
-            csay++;
-            sstep = (*csay >> 16) - (*salast >> 16);
-            sstep *= spixelgap;
-            if (flipy) sstep = -sstep;
-            sp = csp + sstep;
-
-            /*
-            * Advance destination pointer y
-            */
-            dp = reinterpret_cast<tColorRGBA *>(
-                reinterpret_cast<Uint8*>(dp) + dgap);
-        }
-    }
-
-    /*
-    * Remove temp arrays
-    */
-    free(sax);
-    free(say);
-
-    return (0);
-}
-
-/*!
-
-\brief Internal 8 bit Zoomer without smoothing.
-
-Zooms 8bit palette/Y 'src' surface to 'dst' surface.
-Assumes src and dst surfaces are of 8 bit depth.
-Assumes dst surface was allocated with the correct dimensions.
-
-\param src The surface to zoom (input).
-\param dst The zoomed surface (output).
-\param flipx Flag indicating if the image should be horizontally flipped.
-\param flipy Flag indicating if the image should be vertically flipped.
-
-\return 0 for success or -1 for error.
-*/
-static int _zoomSurfaceY(SDL_Surface *src,
-                         SDL_Surface *dst,
-                         int flipx,
-                         int flipy)
-{
-    int x, y;
-    Uint32 *sax, *say, *csax, *csay;
-    int csx, csy;
-    Uint8 *sp, *dp, *csp;
-    int dgap;
-
-    /*
-    * Allocate memory for row increments
-    */
-    if ((sax = static_cast<Uint32 *>(malloc((dst->w + 1) *
-        sizeof(Uint32)))) == nullptr)
-    {
-        return (-1);
-    }
-    if ((say = static_cast<Uint32 *>(malloc((dst->h + 1) *
-        sizeof(Uint32)))) == nullptr)
-    {
-        free(sax);
-        return (-1);
-    }
-
-    /*
-    * Pointer setup
-    */
-    sp = csp = static_cast<Uint8*>(src->pixels);
-    dp = static_cast<Uint8*>(dst->pixels);
-    dgap = dst->pitch - dst->w;
-
-    if (flipx) csp += (src->w-1);
-    if (flipy) csp  = (static_cast<Uint8*>(csp) + src->pitch*(src->h-1));
-
-    /*
-    * Precalculate row increments
-    */
-    csx = 0;
-    csax = sax;
-    for (x = 0; x < dst->w; x++)
-    {
-        csx += src->w;
-        *csax = 0;
-        while (csx >= dst->w)
-        {
-            csx -= dst->w;
-            (*csax)++;
-        }
-        (*csax) = (*csax) * (flipx ? -1 : 1);
-        csax++;
-    }
-    csy = 0;
-    csay = say;
-    for (y = 0; y < dst->h; y++)
-    {
-        csy += src->h;
-        *csay = 0;
-        while (csy >= dst->h)
-        {
-            csy -= dst->h;
-            (*csay)++;
-        }
-        (*csay) = (*csay) * (flipy ? -1 : 1);
-        csay++;
-    }
-
-    /*
-    * Draw
-    */
-    csay = say;
-    for (y = 0; y < dst->h; y++)
-    {
-        csax = sax;
-        sp = csp;
-        for (x = 0; x < dst->w; x++)
-        {
-            /*
-            * Draw
-            */
-            *dp = *sp;
-            /*
-            * Advance source pointers
-            */
-            sp += (*csax);
-            csax++;
-            /*
-            * Advance destination pointer
-            */
-            dp++;
-        }
-        /*
-        * Advance source pointer (for row)
-        */
-        csp += ((*csay) * src->pitch);
-        csay++;
-
-        /*
-        * Advance destination pointers
-        */
-        dp += dgap;
-    }
-
-    /*
-    * Remove temp arrays
-    */
-    free(sax);
-    free(say);
-
-    return (0);
-}
-
-/*!
-\brief Internal 32 bit rotozoomer with optional anti-aliasing.
-
-Rotates and zooms 32 bit RGBA/ABGR 'src' surface to 'dst' surface based on the control
-parameters by scanning the destination surface and applying optionally anti-aliasing
-by bilinear interpolation.
-Assumes src and dst surfaces are of 32 bit depth.
-Assumes dst surface was allocated with the correct dimensions.
-
-\param src Source surface.
-\param dst Destination surface.
-\param cx Horizontal center coordinate.
-\param cy Vertical center coordinate.
-\param isin Integer version of sine of angle.
-\param icos Integer version of cosine of angle.
-\param flipx Flag indicating horizontal mirroring should be applied.
-\param flipy Flag indicating vertical mirroring should be applied.
-\param smooth Flag indicating anti-aliasing should be used.
-*/
-static void _transformSurfaceRGBA(SDL_Surface *src,
-                                  SDL_Surface *dst,
-                                  int cx,
-                                  int cy,
-                                  int isin,
-                                  int icos,
-                                  int flipx,
-                                  int flipy,
-                                  int smooth)
-{
-    int x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
-    tColorRGBA c00, c01, c10, c11, cswap;
-    tColorRGBA *pc, *sp;
-    int gap;
-
-    /*
-    * Variable setup
-    */
-    xd = ((src->w - dst->w) << 15);
-    yd = ((src->h - dst->h) << 15);
-    ax = (cx << 16) - (icos * cx);
-    ay = (cy << 16) - (isin * cx);
-    sw = src->w - 1;
-    sh = src->h - 1;
-    pc = static_cast<tColorRGBA*>(dst->pixels);
-    gap = dst->pitch - dst->w * 4;
-
-    /*
-    * Switch between interpolating and non-interpolating code
-    */
-    if (smooth)
-    {
-        for (y = 0; y < dst->h; y++)
-        {
-            dy = cy - y;
-            sdx = (ax + (isin * dy)) + xd;
-            sdy = (ay - (icos * dy)) + yd;
-            for (x = 0; x < dst->w; x++)
-            {
-                dx = (sdx >> 16);
-                dy = (sdy >> 16);
-                if (flipx) dx = sw - dx;
-                if (flipy) dy = sh - dy;
-                if ((dx > -1) && (dy > -1) &&
-                    (dx < (src->w-1)) && (dy < (src->h-1)))
-                {
-                    sp = static_cast<tColorRGBA *>(src->pixels);
-                    sp += ((src->pitch/4) * dy);
-                    sp += dx;
-                    c00 = *sp;
-                    sp += 1;
-                    c01 = *sp;
-                    sp += (src->pitch/4);
-                    c11 = *sp;
-                    sp -= 1;
-                    c10 = *sp;
-                    if (flipx)
-                    {
-                        cswap = c00; c00=c01; c01=cswap;
-                        cswap = c10; c10=c11; c11=cswap;
-                    }
-                    if (flipy)
-                    {
-                        cswap = c00; c00=c10; c10=cswap;
-                        cswap = c01; c01=c11; c11=cswap;
-                    }
-                    /*
-                    * Interpolate colors
-                    */
-                    ex = (sdx & 0xffff);
-                    ey = (sdy & 0xffff);
-                    t1 = ((((c01.r - c00.r) * ex) >> 16) + c00.r) & 0xff;
-                    t2 = ((((c11.r - c10.r) * ex) >> 16) + c10.r) & 0xff;
-                    pc->r = (((t2 - t1) * ey) >> 16) + t1;
-                    t1 = ((((c01.g - c00.g) * ex) >> 16) + c00.g) & 0xff;
-                    t2 = ((((c11.g - c10.g) * ex) >> 16) + c10.g) & 0xff;
-                    pc->g = (((t2 - t1) * ey) >> 16) + t1;
-                    t1 = ((((c01.b - c00.b) * ex) >> 16) + c00.b) & 0xff;
-                    t2 = ((((c11.b - c10.b) * ex) >> 16) + c10.b) & 0xff;
-                    pc->b = (((t2 - t1) * ey) >> 16) + t1;
-                    t1 = ((((c01.a - c00.a) * ex) >> 16) + c00.a) & 0xff;
-                    t2 = ((((c11.a - c10.a) * ex) >> 16) + c10.a) & 0xff;
-                    pc->a = (((t2 - t1) * ey) >> 16) + t1;
-                }
-                sdx += icos;
-                sdy += isin;
-                pc++;
-            }
-            pc = reinterpret_cast<tColorRGBA *>(
-                reinterpret_cast<Uint8*>(pc) + gap);
-        }
-    }
-    else
-    {
-        for (y = 0; y < dst->h; y++)
-        {
-            dy = cy - y;
-            sdx = (ax + (isin * dy)) + xd;
-            sdy = (ay - (icos * dy)) + yd;
-            for (x = 0; x < dst->w; x++)
-            {
-                dx = static_cast<short>(sdx >> 16);
-                dy = static_cast<short>(sdy >> 16);
-                if (flipx) dx = (src->w-1)-dx;
-                if (flipy) dy = (src->h-1)-dy;
-                if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h))
-                {
-                    sp = reinterpret_cast<tColorRGBA *>(
-                        reinterpret_cast<Uint8*>(src->pixels) +
-                        src->pitch * dy);
-                    sp += dx;
-                    *pc = *sp;
-                }
-                sdx += icos;
-                sdy += isin;
-                pc++;
-            }
-            pc = reinterpret_cast<tColorRGBA *>(
-                reinterpret_cast<Uint8*>(pc) + gap);
-        }
-    }
-}
-
-/*!
-
-\brief Rotates and zooms 8 bit palette/Y 'src' surface to 'dst' surface without smoothing.
-
-Rotates and zooms 8 bit RGBA/ABGR 'src' surface to 'dst' surface based on the control
-parameters by scanning the destination surface.
-Assumes src and dst surfaces are of 8 bit depth.
-Assumes dst surface was allocated with the correct dimensions.
-
-\param src Source surface.
-\param dst Destination surface.
-\param cx Horizontal center coordinate.
-\param cy Vertical center coordinate.
-\param isin Integer version of sine of angle.
-\param icos Integer version of cosine of angle.
-\param flipx Flag indicating horizontal mirroring should be applied.
-\param flipy Flag indicating vertical mirroring should be applied.
-*/
-static void transformSurfaceY(SDL_Surface *src,
-                              SDL_Surface *dst,
-                              int cx,
-                              int cy,
-                              int isin,
-                              int icos,
-                              int flipx,
-                              int flipy)
-{
-    int x, y, dx, dy, xd, yd, sdx, sdy, ax, ay;
-    tColorY *pc, *sp;
-    int gap;
-
-    /*
-    * Variable setup
-    */
-    xd = ((src->w - dst->w) << 15);
-    yd = ((src->h - dst->h) << 15);
-    ax = (cx << 16) - (icos * cx);
-    ay = (cy << 16) - (isin * cx);
-    pc = static_cast<tColorY*>(dst->pixels);
-    gap = dst->pitch - dst->w;
-    /*
-    * Clear surface to colorkey
-    */
-    memset(pc, static_cast<int>(_colorkey(src) & 0xff), dst->pitch * dst->h);
-    /*
-    * Iterate through destination surface
-    */
-    for (y = 0; y < dst->h; y++)
-    {
-        dy = cy - y;
-        sdx = (ax + (isin * dy)) + xd;
-        sdy = (ay - (icos * dy)) + yd;
-        for (x = 0; x < dst->w; x++)
-        {
-            dx = static_cast<short>(sdx >> 16);
-            dy = static_cast<short>(sdy >> 16);
-            if (flipx) dx = (src->w-1)-dx;
-            if (flipy) dy = (src->h-1)-dy;
-            if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h))
-            {
-                sp = static_cast<tColorY *>(src->pixels);
-                sp += (src->pitch * dy + dx);
-                *pc = *sp;
-            }
-            sdx += icos;
-            sdy += isin;
-            pc++;
-        }
-        pc += gap;
-    }
-}
-
-/*!
-\brief Rotates a 8/16/24/32 bit surface in increments of 90 degrees.
-
-Specialized 90 degree rotator which rotates a 'src' surface in 90 degree
-increments clockwise returning a new surface. Faster than rotozoomer since
-no scanning or interpolation takes place. Input surface must be 8/16/24/32 bit.
-(code contributed by J. Schiller, improved by C. Allport and A. Schiffler)
-
-\param src Source surface to rotate.
-\param numClockwiseTurns Number of clockwise 90 degree turns to apply to the source.
-
-\returns The new, rotated surface; or nullptr for surfaces with incorrect input format.
-*/
-SDL_Surface* rotateSurface90Degrees(SDL_Surface *src,
-                                    int numClockwiseTurns)
-{
-    int row, col, newWidth, newHeight;
-    int bpp, bpr;
-    SDL_Surface* dst;
-    Uint8* srcBuf;
-    Uint8* dstBuf;
-    int normalizedClockwiseTurns;
-
-    /* Has to be a valid surface pointer and be a Nbit surface where n is divisible by 8 */
-    if (!src ||
-        !src->format)
-    {
-        SDL_SetError("NULL source surface or source surface format");
-        return nullptr;
-    }
-
-    if ((src->format->BitsPerPixel % 8) != 0)
-    {
-        SDL_SetError("Invalid source surface bit depth");
-        return nullptr;
-    }
-
-    /* normalize numClockwiseTurns */
-    normalizedClockwiseTurns = (numClockwiseTurns % 4);
-    if (normalizedClockwiseTurns < 0)
-    {
-        normalizedClockwiseTurns += 4;
-    }
-
-    /* If turns are even, our new width/height will be the same as the source surface */
-    if (normalizedClockwiseTurns % 2)
-    {
-        newWidth = src->h;
-        newHeight = src->w;
-    }
-    else
-    {
-        newWidth = src->w;
-        newHeight = src->h;
-    }
-
-    dst = SDL_CreateRGBSurface(src->flags,
-        newWidth,
-        newHeight,
-        src->format->BitsPerPixel,
-        src->format->Rmask,
-        src->format->Gmask,
-        src->format->Bmask,
-        src->format->Amask);
-    if (!dst)
-    {
-        SDL_SetError("Could not create destination surface");
-        return nullptr;
-    }
-
-    if (SDL_MUSTLOCK(src))
-    {
-        SDL_LockSurface(src);
-    }
-    if (SDL_MUSTLOCK(dst))
-    {
-        SDL_LockSurface(dst);
-    }
-
-    /* Calculate byte-per-pixel */
-    bpp = src->format->BitsPerPixel / 8;
-
-    switch (normalizedClockwiseTurns)
-    {
-    case 0: /* Make a copy of the surface */
-        {
-            /* Unfortunately SDL_BlitSurface cannot be used to
-            make a copy of the surface
-            since it does not preserve alpha. */
-
-            if (src->pitch == dst->pitch)
-            {
-                /* If the pitch is the same for both surfaces,
-                the memory can be copied all at once. */
-                memcpy(dst->pixels, src->pixels, (src->h * src->pitch));
-            }
-            else
-            {
-                /* If the pitch differs, copy each row separately */
-                srcBuf = static_cast<Uint8*>(src->pixels);
-                dstBuf = static_cast<Uint8*>(dst->pixels);
-                bpr = src->w * bpp;
-                for (row = 0; row < src->h; row++)
-                {
-                    memcpy(dstBuf, srcBuf, bpr);
-                    srcBuf += src->pitch;
-                    dstBuf += dst->pitch;
-                }
-            }
-        }
-        break;
-
-        /* rotate clockwise */
-    case 1: /* rotated 90 degrees clockwise */
-        {
-            for (row = 0; row < src->h; ++row)
-            {
-                srcBuf = static_cast<Uint8*>(src->pixels) +
-                    (row * src->pitch);
-                dstBuf = static_cast<Uint8*>(dst->pixels) +
-                    (dst->w - row - 1) * bpp;
-                for (col = 0; col < src->w; ++col)
-                {
-                    memcpy (dstBuf, srcBuf, bpp);
-                    srcBuf += bpp;
-                    dstBuf += dst->pitch;
-                }
-            }
-        }
-        break;
-
-    case 2: /* rotated 180 degrees clockwise */
-        {
-            for (row = 0; row < src->h; ++row)
-            {
-                srcBuf = static_cast<Uint8*>(src->pixels) +
-                    (row * src->pitch);
-                dstBuf = static_cast<Uint8*>(dst->pixels) +
-                    ((dst->h - row - 1) * dst->pitch) + (dst->w - 1) * bpp;
-                for (col = 0; col < src->w; ++col)
-                {
-                    memcpy (dstBuf, srcBuf, bpp);
-                    srcBuf += bpp;
-                    dstBuf -= bpp;
-                }
-            }
-        }
-        break;
-
-    case 3: /* rotated 270 degrees clockwise */
-        {
-            for (row = 0; row < src->h; ++row)
-            {
-                srcBuf = static_cast<Uint8*>(src->pixels) + (row * src->pitch);
-                dstBuf = static_cast<Uint8*>(dst->pixels) +
-                    (row * bpp) + (dst->h * dst->pitch);
-                for (col = 0; col < src->w; ++col)
-                {
-                    memcpy (dstBuf, srcBuf, bpp);
-                    srcBuf += bpp;
-                    dstBuf -= dst->pitch;
-                }
-            }
-        }
-        break;
-    default:
-        break;
-    }
-    /* end switch */
-
-    if (SDL_MUSTLOCK(src))
-    {
-        SDL_UnlockSurface(src);
-    }
-    if (SDL_MUSTLOCK(dst))
-    {
-        SDL_UnlockSurface(dst);
-    }
-
-    return dst;
-}
-
-
-/*!
-\brief Internal target surface sizing function for rotozooms
-with trig result return.
-
-\param width The source surface width.
-\param height The source surface height.
-\param angle The angle to rotate in degrees.
-\param zoomx The horizontal scaling factor.
-\param zoomy The vertical scaling factor.
-\param dstwidth The calculated width of the destination surface.
-\param dstheight The calculated height of the destination surface.
-\param canglezoom The sine of the angle adjusted by the zoom factor.
-\param sanglezoom The cosine of the angle adjusted by the zoom factor.
-
-*/
-static void _rotozoomSurfaceSizeTrig(int width,
-                                     int height,
-                                     double angle,
-                                     double zoomx,
-                                     double zoomy,
-                                     int *dstwidth,
-                                     int *dstheight,
-                                     double *canglezoom,
-                                     double *sanglezoom)
-{
-    double x, y, cx, cy, sx, sy;
-    double radangle;
-    int dstwidthhalf, dstheighthalf;
-
-    /*
-    * Determine destination width and height by rotating a centered source box
-    */
-    radangle = angle * (M_PI / 180.0);
-    *sanglezoom = sin(radangle);
-    *canglezoom = cos(radangle);
-    *sanglezoom *= zoomx;
-    *canglezoom *= zoomy;
-    x = static_cast<double>(width / 2);
-    y = static_cast<double>(height / 2);
-    cx = *canglezoom * x;
-    cy = *canglezoom * y;
-    sx = *sanglezoom * x;
-    sy = *sanglezoom * y;
-
-    dstwidthhalf = MAX(static_cast<int>(
-        ceil(MAX(MAX(MAX(fabs(cx + sy), fabs(cx - sy)),
-        fabs(-cx + sy)), fabs(-cx - sy)))), 1);
-    dstheighthalf = MAX(static_cast<int>(
-        ceil(MAX(MAX(MAX(fabs(sx + cy), fabs(sx - cy)),
-        fabs(-sx + cy)), fabs(-sx - cy)))), 1);
-    *dstwidth = 2 * dstwidthhalf;
-    *dstheight = 2 * dstheighthalf;
-}
-
-/*!
-\brief Returns the size of the resulting target surface for a
-rotozoomSurfaceXY() call.
-
-\param width The source surface width.
-\param height The source surface height.
-\param angle The angle to rotate in degrees.
-\param zoomx The horizontal scaling factor.
-\param zoomy The vertical scaling factor.
-\param dstwidth The calculated width of the rotozoomed destination surface.
-\param dstheight The calculated height of the rotozoomed destination surface.
-*/
-void rotozoomSurfaceSizeXY(int width,
-                           int height,
-                           double angle,
-                           double zoomx,
-                           double zoomy,
-                           int *dstwidth,
-                           int *dstheight)
-{
-    double dummy_sanglezoom, dummy_canglezoom;
-
-    _rotozoomSurfaceSizeTrig(width, height, angle, zoomx, zoomy,
-        dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);
-}
-
-/*!
-\brief Returns the size of the resulting target surface for a rotozoomSurface()
-call.
-
-\param width The source surface width.
-\param height The source surface height.
-\param angle The angle to rotate in degrees.
-\param zoom The scaling factor.
-\param dstwidth The calculated width of the rotozoomed destination surface.
-\param dstheight The calculated height of the rotozoomed destination surface.
-*/
-void rotozoomSurfaceSize(int width,
-                         int height,
-                         double angle,
-                         double zoom,
-                         int *dstwidth,
-                         int *dstheight)
-{
-    double dummy_sanglezoom, dummy_canglezoom;
-
-    _rotozoomSurfaceSizeTrig(width, height, angle, zoom, zoom,
-        dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);
-}
-
-/*!
-\brief Rotates and zooms a surface and optional anti-aliasing.
-
-Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst'
-surface. 'angle' is the rotation in degrees and 'zoom' a scaling factor.
-If 'smooth' is set then the destination 32bit surface is anti-aliased.
-If the surface is not 8bit or 32bit RGBA/ABGR it will be converted into
-a 32bit RGBA format on the fly.
-
-\param src The surface to rotozoom.
-\param angle The angle to rotate in degrees.
-\param zoom The scaling factor.
-\param smooth Antialiasing flag; set to SMOOTHING_ON to enable.
-
-\return The new rotozoomed surface.
-*/
-SDL_Surface *rotozoomSurface(SDL_Surface *src,
-                             double angle,
-                             double zoom,
-                             int smooth)
-{
-    return rotozoomSurfaceXY(src, angle, zoom, zoom, smooth);
-}
-
-/*!
-\brief Rotates and zooms a surface with different horizontal and
-vertival scaling factors and optional anti-aliasing.
-
-Rotates and zooms a 32bit or 8bit 'src' surface to newly created 'dst' surface.
-'angle' is the rotation in degrees, 'zoomx and 'zoomy' scaling factors.
-If 'smooth' is set then the destination 32bit surface is anti-aliased.
-If the surface is not 8bit or 32bit RGBA/ABGR it will be converted into
-a 32bit RGBA format on the fly.
-
-\param src The surface to rotozoom.
-\param angle The angle to rotate in degrees.
-\param zoomx The horizontal scaling factor.
-\param zoomy The vertical scaling factor.
-\param smooth Antialiasing flag; set to SMOOTHING_ON to enable.
-
-\return The new rotozoomed surface.
-*/
-SDL_Surface *rotozoomSurfaceXY(SDL_Surface *src,
-                               double angle,
-                               double zoomx,
-                               double zoomy,
-                               int smooth)
-{
-    SDL_Surface *rz_src;
-    SDL_Surface *rz_dst;
-    double zoominv;
-    double sanglezoom, canglezoom, sanglezoominv, canglezoominv;
-    int dstwidthhalf, dstwidth, dstheighthalf, dstheight;
-    int is32bit;
-    int i, src_converted;
-    int flipx,flipy;
-
-    /*
-    * Sanity check
-    */
-    if (src == nullptr)
-    {
-        return (nullptr);
-    }
-
-    /*
-    * Determine if source surface is 32bit or 8bit
-    */
-    is32bit = (src->format->BitsPerPixel == 32);
-    if ((is32bit) || (src->format->BitsPerPixel == 8))
-    {
-        /*
-        * Use source surface 'as is'
-        */
-        rz_src = src;
-        src_converted = 0;
-    }
-    else
-    {
-        /*
-        * New source surface is 32bit with a defined RGBA ordering
-        */
-        rz_src =
-            SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32,
-#if SDL_BYTEORDER == SDL_LIL_ENDIAN
-            0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
-#else
-            0xff000000,  0x00ff0000, 0x0000ff00, 0x000000ff
-#endif
-            );
-
-        SDL_BlitSurface(src, nullptr, rz_src, nullptr);
-
-        src_converted = 1;
-        is32bit = 1;
-    }
-
-    /*
-    * Sanity check zoom factor
-    */
-    flipx = (zoomx<0.0);
-    if (flipx) zoomx=-zoomx;
-    flipy = (zoomy<0.0);
-    if (flipy) zoomy=-zoomy;
-    if (zoomx < VALUE_LIMIT) zoomx = VALUE_LIMIT;
-    if (zoomy < VALUE_LIMIT) zoomy = VALUE_LIMIT;
-    zoominv = 65536.0 / (zoomx * zoomx);
-
-    /*
-    * Check if we have a rotozoom or just a zoom
-    */
-    if (fabs(angle) > VALUE_LIMIT)
-    {
-
-        /*
-        * Angle!=0: full rotozoom
-        */
-        /*
-        * -----------------------
-        */
-
-        /* Determine target size */
-        _rotozoomSurfaceSizeTrig(rz_src->w, rz_src->h, angle, zoomx, zoomy,
-            &dstwidth, &dstheight, &canglezoom, &sanglezoom);
-
-        /*
-        * Calculate target factors from sin/cos and zoom
-        */
-        sanglezoominv = sanglezoom;
-        canglezoominv = canglezoom;
-        sanglezoominv *= zoominv;
-        canglezoominv *= zoominv;
-
-        /* Calculate half size */
-        dstwidthhalf = dstwidth / 2;
-        dstheighthalf = dstheight / 2;
-
-        /*
-        * Alloc space to completely contain the rotated surface
-        */
-        rz_dst = nullptr;
-        if (is32bit)
-        {
-            /*
-            * Target surface is 32bit with source RGBA/ABGR ordering
-            */
-            rz_dst =
-                SDL_CreateRGBSurface(SDL_SWSURFACE,
-                dstwidth, dstheight + GUARD_ROWS, 32,
-                rz_src->format->Rmask, rz_src->format->Gmask,
-                rz_src->format->Bmask, rz_src->format->Amask);
-        }
-        else
-        {
-            /*
-            * Target surface is 8bit
-            */
-            rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth,
-                dstheight + GUARD_ROWS, 8, 0, 0, 0, 0);
-        }
-
-        /* Check target */
-        if (rz_dst == nullptr)
-            return nullptr;
-
-        /* Adjust for guard rows */
-        rz_dst->h = dstheight;
-
-        /*
-        * Lock source surface
-        */
-        if (SDL_MUSTLOCK(rz_src))
-        {
-            SDL_LockSurface(rz_src);
-        }
-
-        /*
-        * Check which kind of surface we have
-        */
-        if (is32bit)
-        {
-            /*
-            * Call the 32bit transformation routine to do the rotation
-            * (using alpha)
-            */
-            _transformSurfaceRGBA(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
-                static_cast<int>(sanglezoominv),
-                static_cast<int>(canglezoominv),
-                flipx, flipy,
-                smooth);
-        }
-        else
-        {
-            /*
-            * Copy palette and colorkey info
-            */
-            for (i = 0; i < rz_src->format->palette->ncolors; i++)
-            {
-                rz_dst->format->palette->colors[i] =
-                    rz_src->format->palette->colors[i];
-            }
-            rz_dst->format->palette->ncolors =
-                rz_src->format->palette->ncolors;
-            /*
-            * Call the 8bit transformation routine to do the rotation
-            */
-            transformSurfaceY(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
-                static_cast<int>(sanglezoominv),
-                static_cast<int>(canglezoominv),
-                flipx, flipy);
-        }
-        /*
-        * Unlock source surface
-        */
-        if (SDL_MUSTLOCK(rz_src))
-        {
-            SDL_UnlockSurface(rz_src);
-        }
-
-    }
-    else
-    {
-        /*
-        * Angle=0: Just a zoom
-        */
-        /*
-        * --------------------
-        */
-
-        /*
-        * Calculate target size
-        */
-        zoomSurfaceSize(rz_src->w, rz_src->h, zoomx, zoomy,
-            &dstwidth, &dstheight);
-
-        /*
-        * Alloc space to completely contain the zoomed surface
-        */
-        rz_dst = nullptr;
-        if (is32bit)
-        {
-            /*
-            * Target surface is 32bit with source RGBA/ABGR ordering
-            */
-            rz_dst =
-                SDL_CreateRGBSurface(SDL_SWSURFACE,
-                dstwidth, dstheight + GUARD_ROWS, 32,
-                rz_src->format->Rmask, rz_src->format->Gmask,
-                rz_src->format->Bmask, rz_src->format->Amask);
-        }
-        else
-        {
-            /*
-            * Target surface is 8bit
-            */
-            rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE,
-                dstwidth, dstheight + GUARD_ROWS, 8, 0, 0, 0, 0);
-        }
-
-        /* Check target */
-        if (rz_dst == nullptr)
-            return nullptr;
-
-        /* Adjust for guard rows */
-        rz_dst->h = dstheight;
-
-        /*
-        * Lock source surface
-        */
-        if (SDL_MUSTLOCK(rz_src))
-        {
-            SDL_LockSurface(rz_src);
-        }
-
-        /*
-        * Check which kind of surface we have
-        */
-        if (is32bit)
-        {
-            /*
-            * Call the 32bit transformation routine to do the zooming
-            * (using alpha)
-            */
-            _zoomSurfaceRGBA(rz_src, rz_dst, flipx, flipy, smooth);
-
-        }
-        else
-        {
-            /*
-            * Copy palette and colorkey info
-            */
-            for (i = 0; i < rz_src->format->palette->ncolors; i++)
-            {
-                rz_dst->format->palette->colors[i] =
-                    rz_src->format->palette->colors[i];
-            }
-            rz_dst->format->palette->ncolors =
-                rz_src->format->palette->ncolors;
-
-            /*
-            * Call the 8bit transformation routine to do the zooming
-            */
-            _zoomSurfaceY(rz_src, rz_dst, flipx, flipy);
-        }
-
-        /*
-        * Unlock source surface
-        */
-        if (SDL_MUSTLOCK(rz_src))
-        {
-            SDL_UnlockSurface(rz_src);
-        }
-    }
-
-    /*
-    * Cleanup temp surface
-    */
-    if (src_converted)
-    {
-        SDL_FreeSurface(rz_src);
-    }
-
-    /*
-    * Return destination surface
-    */
-    return (rz_dst);
-}
-
-/*!
-\brief Calculates the size of the target surface for a zoomSurface() call.
-
-The minimum size of the target surface is 1. The input factors
-can be positive or negative.
-
-\param width The width of the source surface to zoom.
-\param height The height of the source surface to zoom.
-\param zoomx The horizontal zoom factor.
-\param zoomy The vertical zoom factor.
-\param dstwidth Pointer to an integer to store the calculated
-width of the zoomed target surface.
-\param dstheight Pointer to an integer to store the calculated
-height of the zoomed target surface.
-*/
-void zoomSurfaceSize(int width, int height,
-                     double zoomx, double zoomy,
-                     int *dstwidth, int *dstheight)
-{
-    /*
-    * Make zoom factors positive
-    */
-    int flipx, flipy;
-    flipx = (zoomx<0.0);
-    if (flipx) zoomx = -zoomx;
-    flipy = (zoomy<0.0);
-    if (flipy) zoomy = -zoomy;
-
-    /*
-    * Sanity check zoom factors
-    */
-    if (zoomx < VALUE_LIMIT)
-    {
-        zoomx = VALUE_LIMIT;
-    }
-    if (zoomy < VALUE_LIMIT)
-    {
-        zoomy = VALUE_LIMIT;
-    }
-
-    /*
-    * Calculate target size
-    */
-    *dstwidth = static_cast<int>(floor((static_cast<double>(
-        width) * zoomx) + 0.5));
-    *dstheight = static_cast<int>(floor((static_cast<double>(
-        height) * zoomy) + 0.5));
-    if (*dstwidth < 1)
-    {
-        *dstwidth = 1;
-    }
-    if (*dstheight < 1)
-    {
-        *dstheight = 1;
-    }
-}
-
-/*!
-\brief Zoom a surface by independent horizontal and vertical
-factors with optional smoothing.
-
-Zooms a 32bit or 8bit 'src' surface to newly created 'dst' surface.
-'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is on
-then the destination 32bit surface is anti-aliased. If the surface is not 8bit
-or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
-If zoom factors are negative, the image is flipped on the axes.
-
-\param src The surface to zoom.
-\param zoomx The horizontal zoom factor.
-\param zoomy The vertical zoom factor.
-\param smooth Antialiasing flag; set to SMOOTHING_ON to enable.
-
-\return The new, zoomed surface.
-*/
-SDL_Surface *zoomSurface(SDL_Surface *src,
-                         double zoomx,
-                         double zoomy,
-                         int smooth)
-{
-    SDL_Surface *rz_src;
-    SDL_Surface *rz_dst;
-    int dstwidth, dstheight;
-    int is32bit;
-    int i, src_converted;
-    int flipx, flipy;
-
-    /*
-    * Sanity check
-    */
-    if (src == nullptr)
-        return (nullptr);
-
-    /*
-    * Determine if source surface is 32bit or 8bit
-    */
-    is32bit = (src->format->BitsPerPixel == 32);
-    if ((is32bit) || (src->format->BitsPerPixel == 8))
-    {
-        /*
-        * Use source surface 'as is'
-        */
-        rz_src = src;
-        src_converted = 0;
-    }
-    else
-    {
-        /*
-        * New source surface is 32bit with a defined RGBA ordering
-        */
-        rz_src =
-            SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32,
-#if SDL_BYTEORDER == SDL_LIL_ENDIAN
-            0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
-#else
-            0xff000000,  0x00ff0000, 0x0000ff00, 0x000000ff
-#endif
-            );
-        if (rz_src == nullptr)
-        {
-            return nullptr;
-        }
-        SDL_BlitSurface(src, nullptr, rz_src, nullptr);
-        src_converted = 1;
-        is32bit = 1;
-    }
-
-    flipx = (zoomx<0.0);
-    if (flipx) zoomx = -zoomx;
-    flipy = (zoomy<0.0);
-    if (flipy) zoomy = -zoomy;
-
-    /* Get size if target */
-    zoomSurfaceSize(rz_src->w, rz_src->h, zoomx, zoomy, &dstwidth, &dstheight);
-
-    /*
-    * Alloc space to completely contain the zoomed surface
-    */
-    rz_dst = nullptr;
-    if (is32bit)
-    {
-        /*
-        * Target surface is 32bit with source RGBA/ABGR ordering
-        */
-        rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE,
-            dstwidth, dstheight + GUARD_ROWS, 32,
-            rz_src->format->Rmask, rz_src->format->Gmask,
-            rz_src->format->Bmask, rz_src->format->Amask);
-    }
-    else
-    {
-        /*
-        * Target surface is 8bit
-        */
-        rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE,
-            dstwidth, dstheight + GUARD_ROWS, 8, 0, 0, 0, 0);
-    }
-
-    /* Check target */
-    if (rz_dst == nullptr)
-    {
-        /*
-        * Cleanup temp surface
-        */
-        if (src_converted)
-        {
-            SDL_FreeSurface(rz_src);
-        }
-        return nullptr;
-    }
-
-    /* Adjust for guard rows */
-    rz_dst->h = dstheight;
-
-    /*
-    * Lock source surface
-    */
-    if (SDL_MUSTLOCK(rz_src))
-    {
-        SDL_LockSurface(rz_src);
-    }
-
-    /*
-    * Check which kind of surface we have
-    */
-    if (is32bit)
-    {
-        /*
-        * Call the 32bit transformation routine to do the zooming (using alpha)
-        */
-        _zoomSurfaceRGBA(rz_src, rz_dst, flipx, flipy, smooth);
-    }
-    else
-    {
-        /*
-        * Copy palette and colorkey info
-        */
-        for (i = 0; i < rz_src->format->palette->ncolors; i++)
-        {
-            rz_dst->format->palette->colors[i] =
-                rz_src->format->palette->colors[i];
-        }
-        rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
-        /*
-        * Call the 8bit transformation routine to do the zooming
-        */
-        _zoomSurfaceY(rz_src, rz_dst, flipx, flipy);
-    }
-    /*
-    * Unlock source surface
-    */
-    if (SDL_MUSTLOCK(rz_src))
-    {
-        SDL_UnlockSurface(rz_src);
-    }
-
-    /*
-    * Cleanup temp surface
-    */
-    if (src_converted)
-    {
-        SDL_FreeSurface(rz_src);
-    }
-
-    /*
-    * Return destination surface
-    */
-    return (rz_dst);
-}
-
-/*!
-\brief Shrink a surface by an integer ratio using averaging.
-
-Shrinks a 32bit or 8bit 'src' surface to a newly created 'dst' surface.
-'factorx' and 'factory' are the shrinking ratios (i.e. 2=1/2 the size,
-3=1/3 the size, etc.) The destination surface is antialiased by averaging
-the source box RGBA or Y information. If the surface is not 8bit
-or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
-The input surface is not modified. The output surface is newly allocated.
-
-\param src The surface to shrink.
-\param factorx The horizontal shrinking ratio.
-\param factory The vertical shrinking ratio.
-
-\return The new, shrunken surface.
-*/
-/*@nullptr@*/
-SDL_Surface *shrinkSurface(SDL_Surface *src,
-                           int factorx,
-                           int factory)
-{
-    int result;
-    SDL_Surface *rz_src;
-    SDL_Surface *rz_dst = nullptr;
-    int dstwidth, dstheight;
-    int is32bit;
-    int i, src_converted = 0;
-    int haveError = 0;
-
-    /*
-    * Sanity check
-    */
-    if (src == nullptr)
-    {
-        return (nullptr);
-    }
-
-    /*
-    * Determine if source surface is 32bit or 8bit
-    */
-    is32bit = (src->format->BitsPerPixel == 32);
-    if ((is32bit) || (src->format->BitsPerPixel == 8))
-    {
-        /*
-        * Use source surface 'as is'
-        */
-        rz_src = src;
-        src_converted = 0;
-    }
-    else
-    {
-        /*
-        * New source surface is 32bit with a defined RGBA ordering
-        */
-        rz_src = SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32,
-#if SDL_BYTEORDER == SDL_LIL_ENDIAN
-            0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
-#else
-            0xff000000,  0x00ff0000, 0x0000ff00, 0x000000ff
-#endif
-            );
-        if (rz_src==nullptr)
-        {
-            haveError = 1;
-            goto exitShrinkSurface;
-        }
-
-        SDL_BlitSurface(src, nullptr, rz_src, nullptr);
-        src_converted = 1;
-        is32bit = 1;
-    }
-
-    /*
-    * Lock the surface
-    */
-    if (SDL_MUSTLOCK(rz_src))
-    {
-        if (SDL_LockSurface(rz_src) < 0)
-        {
-            haveError = 1;
-            goto exitShrinkSurface;
-        }
-    }
-
-    /* Get size for target */
-    dstwidth=rz_src->w/factorx;
-    while (dstwidth*factorx>rz_src->w)
-    {
-        dstwidth--;
-    }
-    dstheight=rz_src->h/factory;
-    while (dstheight*factory>rz_src->h)
-    {
-        dstheight--;
-    }
-
-    /*
-    * Alloc space to completely contain the shrunken surface
-    * (with added guard rows)
-    */
-    if (is32bit==1)
-    {
-        /*
-        * Target surface is 32bit with source RGBA/ABGR ordering
-        */
-        rz_dst = SDL_CreateRGBSurface(
-            SDL_SWSURFACE, dstwidth, dstheight + GUARD_ROWS, 32,
-            rz_src->format->Rmask, rz_src->format->Gmask,
-            rz_src->format->Bmask, rz_src->format->Amask);
-    }
-    else
-    {
-        /*
-        * Target surface is 8bit
-        */
-        rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE,
-            dstwidth, dstheight + GUARD_ROWS, 8, 0, 0, 0, 0);
-    }
-
-    /* Check target */
-    if (rz_dst == nullptr)
-    {
-        haveError = 1;
-        goto exitShrinkSurface;
-    }
-
-    /* Adjust for guard rows */
-    rz_dst->h = dstheight;
-
-    /*
-    * Check which kind of surface we have
-    */
-    if (is32bit==1)
-    {
-        /*
-        * Call the 32bit transformation routine to do the shrinking (using alpha)
-        */
-        result = _shrinkSurfaceRGBA(rz_src, rz_dst, factorx, factory);
-        if ((result!=0) || (rz_dst==nullptr))
-        {
-            haveError = 1;
-            goto exitShrinkSurface;
-        }
-    }
-    else
-    {
-        /*
-        * Copy palette and colorkey info
-        */
-        for (i = 0; i < rz_src->format->palette->ncolors; i++)
-        {
-            rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
-        }
-        rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
-        /*
-        * Call the 8bit transformation routine to do the shrinking
-        */
-        result = _shrinkSurfaceY(rz_src, rz_dst, factorx, factory);
-        if (result!=0)
-        {
-            haveError = 1;
-            goto exitShrinkSurface;
-        }
-    }
-
-exitShrinkSurface:
-    if (rz_src!=nullptr)
-    {
-        /*
-        * Unlock source surface
-        */
-        if (SDL_MUSTLOCK(rz_src))
-        {
-            SDL_UnlockSurface(rz_src);
-        }
-
-        /*
-        * Cleanup temp surface
-        */
-        if (src_converted==1)
-        {
-            SDL_FreeSurface(rz_src);
-        }
-    }
-
-    /* Check error state; maybe need to cleanup destination */
-    if (haveError==1)
-    {
-        if (rz_dst!=nullptr)
-        {
-            SDL_FreeSurface(rz_dst);
-        }
-        rz_dst=nullptr;
-    }
-
-    /*
-    * Return destination surface
-    */
-    return (rz_dst);
-}
diff --git a/src/sdl2gfx/SDL2_rotozoom.h b/src/sdl2gfx/SDL2_rotozoom.h
deleted file mode 100644
index ffab24fbc..000000000
--- a/src/sdl2gfx/SDL2_rotozoom.h
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
-
-SDL2_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces
-
-Copyright (C) 2012-2014  Andreas Schiffler
-
-This software is provided 'as-is', without any express or implied
-warranty. In no event will the authors be held liable for any damages
-arising from the use of this software.
-
-Permission is granted to anyone to use this software for any purpose,
-including commercial applications, and to alter it and redistribute it
-freely, subject to the following restrictions:
-
-1. The origin of this software must not be misrepresented; you must not
-claim that you wrote the original software. If you use this software
-in a product, an acknowledgment in the product documentation would be
-appreciated but is not required.
-
-2. Altered source versions must be plainly marked as such, and must not be
-misrepresented as being the original software.
-
-3. This notice may not be removed or altered from any source
-distribution.
-
-Andreas Schiffler -- aschiffler at ferzkopp dot net
-
-Changed for ManaPlus (C) 2013-2017  ManaPlus developers
-
-*/
-
-#ifndef _SDL2_rotozoom_h
-#define _SDL2_rotozoom_h
-
-#include <math.h>
-
-/* Set up for C function definitions, even when using C++ */
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-#ifndef M_PI
-#define M_PI    3.1415926535897932384626433832795
-#endif
-
-#include "localconsts.h"
-
-PRAGMA48(GCC diagnostic push)
-PRAGMA48(GCC diagnostic ignored "-Wshadow")
-#include <SDL.h>
-PRAGMA48(GCC diagnostic pop)
-
-    /* ---- Defines */
-
-    /*!
-    \brief Disable anti-aliasing (no smoothing).
-    */
-#define SMOOTHING_OFF        0
-
-    /*!
-    \brief Enable anti-aliasing (smoothing).
-    */
-#define SMOOTHING_ON        1
-
-    /* ---- Function Prototypes */
-
-#ifdef _MSC_VER
-#  if defined(DLL_EXPORT) && !defined(LIBSDL2_GFX_DLL_IMPORT)
-#    define SDL2_ROTOZOOM_SCOPE __declspec(dllexport)
-#  else
-#    ifdef LIBSDL2_GFX_DLL_IMPORT
-#      define SDL2_ROTOZOOM_SCOPE __declspec(dllimport)
-#    endif
-#  endif
-#endif
-#ifndef SDL2_ROTOZOOM_SCOPE
-#  define SDL2_ROTOZOOM_SCOPE extern
-#endif
-
-    /*
-
-    Rotozoom functions
-
-    */
-
-    SDL2_ROTOZOOM_SCOPE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
-
-    SDL2_ROTOZOOM_SCOPE SDL_Surface *rotozoomSurfaceXY
-        (SDL_Surface * src, double angle, double zoomx, double zoomy, int smooth);
-
-
-    SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
-        int *dstheight);
-
-    SDL2_ROTOZOOM_SCOPE void rotozoomSurfaceSizeXY
-        (int width, int height, double angle, double zoomx, double zoomy,
-        int *dstwidth, int *dstheight);
-
-    /*
-
-    Zooming functions
-
-    */
-
-    SDL2_ROTOZOOM_SCOPE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
-
-    SDL2_ROTOZOOM_SCOPE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
-
-    /*
-
-    Shrinking functions
-
-    */
-
-    SDL2_ROTOZOOM_SCOPE SDL_Surface *shrinkSurface(SDL_Surface * src, int factorx, int factory);
-
-    /*
-
-    Specialized rotation functions
-
-    */
-
-    SDL2_ROTOZOOM_SCOPE SDL_Surface* rotateSurface90Degrees(SDL_Surface* src, int numClockwiseTurns);
-
-    /* Ends C function definitions when using C++ */
-#ifdef __cplusplus
-}
-#endif
-
-#endif                /* _SDL2_rotozoom_h */