separate SDLGraphics and SDLImageHelper to 1.2 and 2.

add missing sdlshared.h

1 files changed, 1150 insertions, 0 deletions

diff --git a/src/sdl2graphics.cpp b/src/sdl2graphics.cpp
new file mode 100644
index 000000000..18b8b8e2e
--- /dev/null
+++ b/src/sdl2graphics.cpp
@@ -0,0 +1,1150 @@
+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2004-2009  The Mana World Development Team
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *  Copyright (C) 2011-2013  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef USE_SDL2
+
+#include "sdl2graphics.h"
+
+#include "main.h"
+
+#include "configuration.h"
+#include "graphicsmanager.h"
+#include "graphicsvertexes.h"
+#include "logger.h"
+
+#include "resources/imagehelper.h"
+
+#include <guichan/sdl/sdlpixel.hpp>
+
+#include <SDL_gfxBlitFunc.h>
+
+#include "debug.h"
+
+int MSDL_gfxBlitRGBA(SDL_Surface *src, SDL_Rect *srcrect,
+                     SDL_Surface *dst, SDL_Rect *dstrect)
+{
+    return SDL_gfxBlitRGBA(src, srcrect, dst, dstrect);
+}
+
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+static unsigned int *cR = nullptr;
+static unsigned int *cG = nullptr;
+static unsigned int *cB = nullptr;
+#endif
+
+SDLGraphics::SDLGraphics() :
+    Graphics(),
+    mBlitMode(BLIT_NORMAL),
+    mOldPixel(0),
+    mOldAlpha(0)
+{
+}
+
+SDLGraphics::~SDLGraphics()
+{
+}
+
+bool SDLGraphics::drawRescaledImage(const Image *const image, int srcX, int srcY,
+                                    int dstX, int dstY,
+                                    const int width, const int height,
+                                    const int desiredWidth,
+                                    const int desiredHeight,
+                                    const bool useColor A_UNUSED)
+{
+    FUNC_BLOCK("Graphics::drawRescaledImage", 1)
+    // Check that preconditions for blitting are met.
+    if (!mTarget || !image)
+        return false;
+    if (!image->mSDLSurface)
+        return false;
+
+    Image *const tmpImage = image->SDLgetScaledImage(
+        desiredWidth, desiredHeight);
+
+    if (!tmpImage)
+        return false;
+    if (!tmpImage->mSDLSurface)
+        return false;
+
+    dstX += mClipStack.top().xOffset;
+    dstY += mClipStack.top().yOffset;
+
+    srcX += image->mBounds.x;
+    srcY += image->mBounds.y;
+
+    SDL_Rect dstRect;
+    SDL_Rect srcRect;
+    dstRect.x = static_cast<int16_t>(dstX);
+    dstRect.y = static_cast<int16_t>(dstY);
+    srcRect.x = static_cast<int16_t>(srcX);
+    srcRect.y = static_cast<int16_t>(srcY);
+    srcRect.w = static_cast<uint16_t>(width);
+    srcRect.h = static_cast<uint16_t>(height);
+
+    const bool returnValue = !(SDL_BlitSurface(tmpImage->mSDLSurface,
+        &srcRect, mTarget, &dstRect) < 0);
+
+    delete tmpImage;
+
+    return returnValue;
+}
+
+bool SDLGraphics::drawImage2(const Image *const image, int srcX, int srcY,
+                          int dstX, int dstY, const int width,
+                          const int height, const bool useColor A_UNUSED)
+{
+    FUNC_BLOCK("Graphics::drawImage2", 1)
+    // Check that preconditions for blitting are met.
+    if (!mTarget || !image || !image->mSDLSurface)
+        return false;
+
+    dstX += mClipStack.top().xOffset;
+    dstY += mClipStack.top().yOffset;
+
+    srcX += image->mBounds.x;
+    srcY += image->mBounds.y;
+
+    SDL_Rect dstRect;
+    SDL_Rect srcRect;
+    dstRect.x = static_cast<int16_t>(dstX);
+    dstRect.y = static_cast<int16_t>(dstY);
+    srcRect.x = static_cast<int16_t>(srcX);
+    srcRect.y = static_cast<int16_t>(srcY);
+    srcRect.w = static_cast<uint16_t>(width);
+    srcRect.h = static_cast<uint16_t>(height);
+
+    if (mBlitMode == BLIT_NORMAL)
+    {
+        return !(SDL_BlitSurface(image->mSDLSurface, &srcRect,
+                                 mTarget, &dstRect) < 0);
+    }
+    else
+    {
+        return !(SDL_gfxBlitRGBA(image->mSDLSurface, &srcRect,
+                                 mTarget, &dstRect) < 0);
+    }
+}
+
+void SDLGraphics::drawImagePattern(const Image *const image,
+                                   const int x, const int y,
+                                   const int w, const int h)
+{
+    FUNC_BLOCK("Graphics::drawImagePattern", 1)
+    // Check that preconditions for blitting are met.
+    if (!mTarget || !image)
+        return;
+    if (!image->mSDLSurface)
+        return;
+
+    const int iw = image->mBounds.w;
+    const int ih = image->mBounds.h;
+
+    if (iw == 0 || ih == 0)
+        return;
+
+    for (int py = 0; py < h; py += ih)  // Y position on pattern plane
+    {
+        const int dh = (py + ih >= h) ? h - py : ih;
+        const int srcY = image->mBounds.y;
+        const int dstY = y + py + mClipStack.top().yOffset;
+
+        for (int px = 0; px < w; px += iw)  // X position on pattern plane
+        {
+            const int dw = (px + iw >= w) ? w - px : iw;
+            const int srcX = image->mBounds.x;
+            const int dstX = x + px + mClipStack.top().xOffset;
+
+            SDL_Rect dstRect;
+            SDL_Rect srcRect;
+            dstRect.x = static_cast<int16_t>(dstX);
+            dstRect.y = static_cast<int16_t>(dstY);
+            srcRect.x = static_cast<int16_t>(srcX);
+            srcRect.y = static_cast<int16_t>(srcY);
+            srcRect.w = static_cast<uint16_t>(dw);
+            srcRect.h = static_cast<uint16_t>(dh);
+
+            SDL_BlitSurface(image->mSDLSurface, &srcRect, mTarget, &dstRect);
+        }
+    }
+}
+
+void SDLGraphics::drawRescaledImagePattern(const Image *const image,
+                                           const int x, const int y,
+                                           const int w, const int h,
+                                           const int scaledWidth,
+                                           const int scaledHeight)
+{
+    // Check that preconditions for blitting are met.
+    if (!mTarget || !image)
+        return;
+    if (!image->mSDLSurface)
+        return;
+
+    if (scaledHeight == 0 || scaledWidth == 0)
+        return;
+
+    Image *const tmpImage = image->SDLgetScaledImage(
+        scaledWidth, scaledHeight);
+    if (!tmpImage)
+        return;
+
+    const int iw = tmpImage->mBounds.w;
+    const int ih = tmpImage->mBounds.h;
+
+    if (iw == 0 || ih == 0)
+        return;
+
+    for (int py = 0; py < h; py += ih)  // Y position on pattern plane
+    {
+        const int dh = (py + ih >= h) ? h - py : ih;
+        const int srcY = tmpImage->mBounds.y;
+        const int dstY = y + py + mClipStack.top().yOffset;
+
+        for (int px = 0; px < w; px += iw)  // X position on pattern plane
+        {
+            const int dw = (px + iw >= w) ? w - px : iw;
+            const int srcX = tmpImage->mBounds.x;
+            const int dstX = x + px + mClipStack.top().xOffset;
+
+            SDL_Rect dstRect;
+            SDL_Rect srcRect;
+            dstRect.x = static_cast<int16_t>(dstX);
+            dstRect.y = static_cast<int16_t>(dstY);
+            srcRect.x = static_cast<int16_t>(srcX);
+            srcRect.y = static_cast<int16_t>(srcY);
+            srcRect.w = static_cast<uint16_t>(dw);
+            srcRect.h = static_cast<uint16_t>(dh);
+
+            SDL_BlitSurface(tmpImage->mSDLSurface, &srcRect,
+                            mTarget, &dstRect);
+        }
+    }
+
+    delete tmpImage;
+}
+
+void SDLGraphics::calcImagePattern(ImageVertexes* const vert,
+                                   const Image *const image,
+                                   const int x, const int y,
+                                   const int w, const int h) const
+{
+    // Check that preconditions for blitting are met.
+    if (!vert || !mTarget || !image || !image->mSDLSurface)
+        return;
+
+    const int iw = image->mBounds.w;
+    const int ih = image->mBounds.h;
+
+    if (iw == 0 || ih == 0)
+        return;
+
+    for (int py = 0; py < h; py += ih)  // Y position on pattern plane
+    {
+        const int dh = (py + ih >= h) ? h - py : ih;
+        const int srcY = image->mBounds.y;
+        const int dstY = y + py + mClipStack.top().yOffset;
+
+        for (int px = 0; px < w; px += iw)  // X position on pattern plane
+        {
+            const int dw = (px + iw >= w) ? w - px : iw;
+            const int srcX = image->mBounds.x;
+            const int dstX = x + px + mClipStack.top().xOffset;
+
+            DoubleRect *const r = new DoubleRect();
+            SDL_Rect &dstRect = r->dst;
+            SDL_Rect &srcRect = r->src;
+            dstRect.x = static_cast<int16_t>(dstX);
+            dstRect.y = static_cast<int16_t>(dstY);
+            srcRect.x = static_cast<int16_t>(srcX);
+            srcRect.y = static_cast<int16_t>(srcY);
+            srcRect.w = static_cast<uint16_t>(dw);
+            srcRect.h = static_cast<uint16_t>(dh);
+
+            if (SDL_FakeUpperBlit(image->mSDLSurface, &srcRect,
+                mTarget, &dstRect) == 1)
+            {
+                vert->sdl.push_back(r);
+            }
+            else
+            {
+                delete r;
+            }
+        }
+    }
+}
+
+void SDLGraphics::calcImagePattern(ImageCollection* const vertCol,
+                                   const Image *const image,
+                                   const int x, const int y,
+                                   const int w, const int h) const
+{
+    ImageVertexes *vert = nullptr;
+    if (vertCol->currentImage != image)
+    {
+        vert = new ImageVertexes();
+        vertCol->currentImage = image;
+        vertCol->currentVert = vert;
+        vert->image = image;
+        vertCol->draws.push_back(vert);
+    }
+    else
+    {
+        vert = vertCol->currentVert;
+    }
+
+    calcImagePattern(vert, image, x, y, w, h);
+}
+
+void SDLGraphics::calcTile(ImageVertexes *const vert,
+                           const Image *const image,
+                           int x, int y) const
+{
+    vert->image = image;
+    calcTileSDL(vert, x, y);
+}
+
+void SDLGraphics::calcTileSDL(ImageVertexes *const vert, int x, int y) const
+{
+    // Check that preconditions for blitting are met.
+    if (!vert || !vert->image || !vert->image->mSDLSurface)
+        return;
+
+    const Image *const image = vert->image;
+
+    x += mClipStack.top().xOffset;
+    y += mClipStack.top().yOffset;
+
+    DoubleRect *rect = new DoubleRect();
+
+    rect->dst.x = static_cast<int16_t>(x);
+    rect->dst.y = static_cast<int16_t>(y);
+    rect->src.x = static_cast<int16_t>(image->mBounds.x);
+    rect->src.y = static_cast<int16_t>(image->mBounds.y);
+    rect->src.w = static_cast<uint16_t>(image->mBounds.w);
+    rect->src.h = static_cast<uint16_t>(image->mBounds.h);
+    if (SDL_FakeUpperBlit(image->mSDLSurface, &rect->src,
+        mTarget, &rect->dst) == 1)
+    {
+        vert->sdl.push_back(rect);
+    }
+    else
+    {
+        delete rect;
+    }
+}
+
+void SDLGraphics::calcTile(ImageCollection *const vertCol,
+                           const Image *const image,
+                           int x, int y)
+{
+    if (vertCol->currentImage != image)
+    {
+        ImageVertexes *const vert = new ImageVertexes();
+        vertCol->currentImage = image;
+        vertCol->currentVert = vert;
+        vert->image = image;
+        vertCol->draws.push_back(vert);
+        calcTileSDL(vert, x, y);
+    }
+    else
+    {
+        calcTileSDL(vertCol->currentVert, x, y);
+    }
+}
+
+void SDLGraphics::drawTile(const ImageCollection *const vertCol)
+{
+    const ImageVertexesVector &draws = vertCol->draws;
+    const ImageCollectionCIter it_end = draws.end();
+    for (ImageCollectionCIter it = draws.begin(); it != it_end; ++ it)
+    {
+        const ImageVertexes *const vert = *it;
+        const Image *const img = vert->image;
+        const DoubleRects *const rects = &vert->sdl;
+        DoubleRects::const_iterator it2 = rects->begin();
+        const DoubleRects::const_iterator it2_end = rects->end();
+        while (it2 != it2_end)
+        {
+            SDL_LowerBlit(img->mSDLSurface, &(*it2)->src,
+                mTarget, &(*it2)->dst);
+            ++ it2;
+        }
+    }
+}
+
+void SDLGraphics::drawTile(const ImageVertexes *const vert)
+{
+    // vert and img must be != 0
+    const Image *const img = vert->image;
+    const DoubleRects *const rects = &vert->sdl;
+    DoubleRects::const_iterator it = rects->begin();
+    const DoubleRects::const_iterator it_end = rects->end();
+    while (it != it_end)
+    {
+        SDL_LowerBlit(img->mSDLSurface, &(*it)->src, mTarget, &(*it)->dst);
+        ++ it;
+    }
+}
+
+void SDLGraphics::updateScreen()
+{
+    BLOCK_START("Graphics::updateScreen")
+    if (mDoubleBuffer)
+    {
+        SDL_Flip(mTarget);
+    }
+    else
+    {
+        SDL_UpdateRects(mTarget, 1, &mRect);
+//        SDL_UpdateRect(mTarget, 0, 0, 0, 0);
+    }
+    BLOCK_END("Graphics::updateScreen")
+}
+
+SDL_Surface *SDLGraphics::getScreenshot()
+{
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+    const int rmask = 0xff000000;
+    const int gmask = 0x00ff0000;
+    const int bmask = 0x0000ff00;
+#else
+    const int rmask = 0x000000ff;
+    const int gmask = 0x0000ff00;
+    const int bmask = 0x00ff0000;
+#endif
+    const int amask = 0x00000000;
+
+    SDL_Surface *const screenshot = SDL_CreateRGBSurface(SDL_SWSURFACE,
+        mTarget->w, mTarget->h, 24, rmask, gmask, bmask, amask);
+
+    if (screenshot)
+        SDL_BlitSurface(mTarget, nullptr, screenshot, nullptr);
+
+    return screenshot;
+}
+
+bool SDLGraphics::drawNet(const int x1, const int y1,
+                          const int x2, const int y2,
+                          const int width, const int height)
+{
+    for (int y = y1; y < y2; y += height)
+        drawLine(x1, y, x2, y);
+
+    for (int x = x1; x < x2; x += width)
+        drawLine(x, y1, x, y2);
+
+    return true;
+}
+
+bool SDLGraphics::calcWindow(ImageCollection *const vertCol,
+                             const int x, const int y,
+                             const int w, const int h,
+                             const ImageRect &imgRect)
+{
+    ImageVertexes *vert = nullptr;
+    Image *const image = imgRect.grid[4];
+    if (vertCol->currentImage != image)
+    {
+        vert = new ImageVertexes();
+        vertCol->currentImage = image;
+        vertCol->currentVert = vert;
+        vert->image = image;
+        vertCol->draws.push_back(vert);
+    }
+    else
+    {
+        vert = vertCol->currentVert;
+    }
+
+    return calcImageRect(vert, x, y, w, h,
+        imgRect.grid[0], imgRect.grid[2], imgRect.grid[6], imgRect.grid[8],
+        imgRect.grid[1], imgRect.grid[5], imgRect.grid[7], imgRect.grid[3],
+        imgRect.grid[4]);
+}
+
+int SDLGraphics::SDL_FakeUpperBlit(const SDL_Surface *const src,
+                                SDL_Rect *const srcrect,
+                                const SDL_Surface *const dst,
+                                SDL_Rect *dstrect) const
+{
+    SDL_Rect fulldst;
+    int srcx, srcy, w, h;
+
+    // Make sure the surfaces aren't locked
+    if (!src || !dst)
+        return -1;
+
+    if (src->locked || dst->locked)
+        return -1;
+
+    // If the destination rectangle is nullptr, use the entire dest surface
+    if (!dstrect)
+    {
+        fulldst.x = 0;
+        fulldst.y = 0;
+        dstrect = &fulldst;
+    }
+
+    // clip the source rectangle to the source surface
+    if (srcrect)
+    {
+        srcx = srcrect->x;
+        w = srcrect->w;
+        if (srcx < 0)
+        {
+            w += srcx;
+            dstrect->x -= static_cast<int16_t>(srcx);
+            srcx = 0;
+        }
+        int maxw = src->w - srcx;
+        if (maxw < w)
+            w = maxw;
+
+        srcy = srcrect->y;
+        h = srcrect->h;
+        if (srcy < 0)
+        {
+            h += srcy;
+            dstrect->y -= static_cast<int16_t>(srcy);
+            srcy = 0;
+        }
+        int maxh = src->h - srcy;
+        if (maxh < h)
+            h = maxh;
+    }
+    else
+    {
+        srcx = 0;
+        srcy = 0;
+        w = src->w;
+        h = src->h;
+    }
+
+    // clip the destination rectangle against the clip rectangle
+    {
+        const SDL_Rect *const clip = &dst->clip_rect;
+        int dx = clip->x - dstrect->x;
+        if (dx > 0)
+        {
+            w -= dx;
+            dstrect->x += static_cast<int16_t>(dx);
+            srcx += dx;
+        }
+        dx = dstrect->x + w - clip->x - clip->w;
+        if (dx > 0)
+            w -= dx;
+
+        int dy = clip->y - dstrect->y;
+        if (dy > 0)
+        {
+            h -= dy;
+            dstrect->y += static_cast<int16_t>(dy);
+            srcy += dy;
+        }
+        dy = dstrect->y + h - clip->y - clip->h;
+        if (dy > 0)
+            h -= dy;
+    }
+
+    if (w > 0 && h > 0)
+    {
+        if (srcrect)
+        {
+            srcrect->x = static_cast<int16_t>(srcx);
+            srcrect->y = static_cast<int16_t>(srcy);
+            srcrect->w = static_cast<int16_t>(w);
+            srcrect->h = static_cast<int16_t>(h);
+        }
+        dstrect->w = static_cast<int16_t>(w);
+        dstrect->h = static_cast<int16_t>(h);
+
+        return 1;
+//        return SDL_LowerBlit(src, &sr, dst, dstrect);
+    }
+    dstrect->w = dstrect->h = 0;
+    return 0;
+}
+
+void SDLGraphics::fillRectangle(const gcn::Rectangle& rectangle)
+{
+    FUNC_BLOCK("Graphics::fillRectangle", 1)
+    if (mClipStack.empty())
+        return;
+
+    const gcn::ClipRectangle& top = mClipStack.top();
+
+    gcn::Rectangle area = rectangle;
+    area.x += top.xOffset;
+    area.y += top.yOffset;
+
+    if (!area.isIntersecting(top))
+        return;
+
+    if (mAlpha)
+    {
+        const int x1 = area.x > top.x ? area.x : top.x;
+        const int y1 = area.y > top.y ? area.y : top.y;
+        const int x2 = area.x + area.width < top.x + top.width ?
+            area.x + area.width : top.x + top.width;
+        const int y2 = area.y + area.height < top.y + top.height ?
+            area.y + area.height : top.y + top.height;
+        int x, y;
+
+        SDL_LockSurface(mTarget);
+
+        const int bpp = mTarget->format->BytesPerPixel;
+        const uint32_t pixel = SDL_MapRGB(mTarget->format,
+            static_cast<uint8_t>(mColor.r), static_cast<uint8_t>(mColor.g),
+            static_cast<uint8_t>(mColor.b));
+
+        switch (bpp)
+        {
+            case 1:
+                for (y = y1; y < y2; y++)
+                {
+                    uint8_t *const p = static_cast<uint8_t *>(mTarget->pixels)
+                        + y * mTarget->pitch;
+                    for (x = x1; x < x2; x++)
+                        *(p + x) = static_cast<uint8_t>(pixel);
+                }
+                break;
+            case 2:
+                for (y = y1; y < y2; y++)
+                {
+                    uint8_t *const p0 = static_cast<uint8_t *>(mTarget->pixels)
+                        + y * mTarget->pitch;
+                    for (x = x1; x < x2; x++)
+                    {
+                        uint8_t *const p = p0 + x * 2;
+                        *reinterpret_cast<uint16_t *>(p) = gcn::SDLAlpha16(
+                            static_cast<uint16_t>(pixel),
+                            *reinterpret_cast<uint16_t *>(p),
+                            static_cast<uint8_t>(mColor.a), mTarget->format);
+                    }
+                }
+                break;
+            case 3:
+            {
+                const int ca = 255 - mColor.a;
+                const int cr = mColor.r * mColor.a;
+                const int cg = mColor.g * mColor.a;
+                const int cb = mColor.b * mColor.a;
+
+                for (y = y1; y < y2; y++)
+                {
+                    uint8_t *const p0 = static_cast<uint8_t *>(mTarget->pixels)
+                        + y * mTarget->pitch;
+                    for (x = x1; x < x2; x++)
+                    {
+                        uint8_t *const p = p0 + x * 3;
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+                        p[2] = static_cast<uint8_t>((p[2] * ca + cb) >> 8);
+                        p[1] = static_cast<uint8_t>((p[1] * ca + cg) >> 8);
+                        p[0] = static_cast<uint8_t>((p[0] * ca + cr) >> 8);
+#else
+                        p[0] = static_cast<uint8_t>((p[0] * ca + cb) >> 8);
+                        p[1] = static_cast<uint8_t>((p[1] * ca + cg) >> 8);
+                        p[2] = static_cast<uint8_t>((p[2] * ca + cr) >> 8);
+#endif
+                    }
+                }
+                break;
+            }
+            case 4:
+            {
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+                const unsigned pb = (pixel & 0xff) * mColor.a;
+                const unsigned pg = (pixel & 0xff00) * mColor.a;
+                const unsigned pr = (pixel & 0xff0000) * mColor.a;
+                const unsigned a1 = (255 - mColor.a);
+
+                for (y = y1; y < y2; y++)
+                {
+                    uint8_t *const p0 = static_cast<uint8_t *>(mTarget->pixels)
+                        + y * mTarget->pitch;
+                    for (x = x1; x < x2; x++)
+                    {
+                        uint8_t *p = p0 + x * 4;
+                        uint32_t dst = *reinterpret_cast<uint32_t *>(p);
+                        const unsigned int b = (pb + (dst & 0xff) * a1) >> 8;
+                        const unsigned int g = (pg + (dst & 0xff00) * a1) >> 8;
+                        const unsigned int r = (pr
+                            + (dst & 0xff0000) * a1) >> 8;
+
+                        *reinterpret_cast<uint32_t *>(p) = ((b & 0xff)
+                            | (g & 0xff00) | (r & 0xff0000));
+                    }
+                }
+#else
+                if (!cR)
+                {
+                    cR = new unsigned int[0x100];
+                    cG = new unsigned int[0x100];
+                    cB = new unsigned int[0x100];
+                    mOldPixel = 0;
+                    mOldAlpha = mColor.a;
+                }
+
+                const SDL_PixelFormat * const format = mTarget->format;
+                const unsigned rMask = format->Rmask;
+                const unsigned gMask = format->Gmask;
+                const unsigned bMask = format->Bmask;
+//                const unsigned aMask = format->Amask;
+                unsigned rShift = rMask / 0xff;
+                unsigned gShift = gMask / 0xff;
+                unsigned bShift = bMask / 0xff;
+                if (!rShift)
+                    rShift = 1;
+                if (!gShift)
+                    gShift = 1;
+                if (!bShift)
+                    bShift = 1;
+                if (pixel != mOldPixel || mColor.a != mOldAlpha)
+                {
+                    const unsigned pb = (pixel & bMask) * mColor.a;
+                    const unsigned pg = (pixel & gMask) * mColor.a;
+                    const unsigned pr = (pixel & rMask) * mColor.a;
+                    const unsigned a0 = (255 - mColor.a);
+
+                    const unsigned int a1 = a0 * bShift;
+                    const unsigned int a2 = a0 * gShift;
+                    const unsigned int a3 = a0 * rShift;
+
+                    for (int f = 0; f <= 0xff; f ++)
+                    {
+                        cB[f] = ((pb + f * a1) >> 8) & bMask;
+                        cG[f] = ((pg + f * a2) >> 8) & gMask;
+                        cR[f] = ((pr + f * a3) >> 8) & rMask;
+                    }
+
+                    mOldPixel = pixel;
+                    mOldAlpha = mColor.a;
+                }
+
+                for (y = y1; y < y2; y++)
+                {
+                    uint32_t *const p0 = reinterpret_cast<uint32_t*>(
+                        static_cast<uint8_t*>(mTarget->pixels)
+                        + y * mTarget->pitch);
+                    for (x = x1; x < x2; x++)
+                    {
+                        uint32_t *const p = p0 + x;
+                        const uint32_t dst = *p;
+                        *p = cB[dst & bMask / bShift]
+                            | cG[(dst & gMask) / gShift]
+                            | cR[(dst & rMask) / rShift];
+                    }
+                }
+#endif
+                break;
+            }
+            default:
+                break;
+        }
+
+        SDL_UnlockSurface(mTarget);
+    }
+    else
+    {
+        SDL_Rect rect;
+        rect.x = static_cast<int16_t>(area.x);
+        rect.y = static_cast<int16_t>(area.y);
+        rect.w = static_cast<uint16_t>(area.width);
+        rect.h = static_cast<uint16_t>(area.height);
+
+        const uint32_t color = SDL_MapRGBA(mTarget->format,
+            static_cast<int8_t>(mColor.r),
+            static_cast<int8_t>(mColor.g),
+            static_cast<int8_t>(mColor.b),
+            static_cast<int8_t>(mColor.a));
+        SDL_FillRect(mTarget, &rect, color);
+    }
+}
+
+void SDLGraphics::_beginDraw()
+{
+    pushClipArea(gcn::Rectangle(0, 0, mTarget->w, mTarget->h));
+}
+
+void SDLGraphics::_endDraw()
+{
+    popClipArea();
+}
+
+bool SDLGraphics::pushClipArea(gcn::Rectangle area)
+{
+    SDL_Rect rect;
+    const bool result = gcn::Graphics::pushClipArea(area);
+
+    const gcn::ClipRectangle &carea = mClipStack.top();
+    rect.x = static_cast<int16_t>(carea.x);
+    rect.y = static_cast<int16_t>(carea.y);
+    rect.w = static_cast<int16_t>(carea.width);
+    rect.h = static_cast<int16_t>(carea.height);
+    SDL_SetClipRect(mTarget, &rect);
+
+    return result;
+}
+
+void SDLGraphics::popClipArea()
+{
+    gcn::Graphics::popClipArea();
+
+    if (mClipStack.empty())
+        return;
+
+    const gcn::ClipRectangle &carea = mClipStack.top();
+    SDL_Rect rect;
+    rect.x = static_cast<int16_t>(carea.x);
+    rect.y = static_cast<int16_t>(carea.y);
+    rect.w = static_cast<int16_t>(carea.width);
+    rect.h = static_cast<int16_t>(carea.height);
+
+    SDL_SetClipRect(mTarget, &rect);
+}
+
+void SDLGraphics::drawPoint(int x, int y)
+{
+    if (mClipStack.empty())
+        return;
+
+    const gcn::ClipRectangle& top = mClipStack.top();
+
+    x += top.xOffset;
+    y += top.yOffset;
+
+    if (!top.isPointInRect(x, y))
+        return;
+
+    if (mAlpha)
+        SDLputPixelAlpha(mTarget, x, y, mColor);
+    else
+        SDLputPixel(mTarget, x, y, mColor);
+}
+
+void SDLGraphics::drawHLine(int x1, int y, int x2)
+{
+    if (mClipStack.empty())
+        return;
+
+    const gcn::ClipRectangle& top = mClipStack.top();
+
+    const int xOffset = top.xOffset;
+    x1 += xOffset;
+    y += top.yOffset;
+    x2 += xOffset;
+
+    const int topY = top.y;
+    if (y < topY || y >= topY + top.height)
+        return;
+
+    if (x1 > x2)
+    {
+        x1 ^= x2;
+        x2 ^= x1;
+        x1 ^= x2;
+    }
+
+    const int topX = top.x;
+    if (topX > x1)
+    {
+        if (topX > x2)
+            return;
+
+        x1 = topX;
+    }
+
+    const int sumX = topX + top.width;
+    if (sumX <= x2)
+    {
+        if (sumX <= x1)
+            return;
+
+        x2 = sumX -1;
+    }
+
+    const int bpp = mTarget->format->BytesPerPixel;
+
+    SDL_LockSurface(mTarget);
+
+    uint8_t *p = static_cast<uint8_t*>(mTarget->pixels)
+        + y * mTarget->pitch + x1 * bpp;
+
+    const uint32_t pixel = SDL_MapRGB(mTarget->format,
+        static_cast<uint8_t>(mColor.r),
+        static_cast<uint8_t>(mColor.g),
+        static_cast<uint8_t>(mColor.b));
+    switch (bpp)
+    {
+        case 1:
+            for (; x1 <= x2; ++x1)
+                *(p++) = static_cast<uint8_t>(pixel);
+            break;
+
+        case 2:
+        {
+            uint16_t* q = reinterpret_cast<uint16_t*>(p);
+            for (; x1 <= x2; ++x1)
+                *(q++) = pixel;
+            break;
+        }
+
+        case 3:
+        {
+            const uint8_t b0 = static_cast<uint8_t>((pixel >> 16) & 0xff);
+            const uint8_t b1 = static_cast<uint8_t>((pixel >> 8) & 0xff);
+            const uint8_t b2 = static_cast<uint8_t>(pixel & 0xff);
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+            for (; x1 <= x2; ++x1)
+            {
+                p[0] = b0;
+                p[1] = b1;
+                p[2] = b2;
+                p += 3;
+            }
+#else
+            for (; x1 <= x2; ++x1)
+            {
+                p[0] = b2;
+                p[1] = b1;
+                p[2] = b0;
+                p += 3;
+            }
+#endif
+            break;
+        }
+
+        case 4:
+        {
+            uint32_t *q = reinterpret_cast<uint32_t*>(p);
+            if (mAlpha)
+            {
+                unsigned char a = static_cast<unsigned char>(mColor.a);
+                unsigned char a1 = 255 - a;
+                const int b0 = (pixel & 0xff) * a;
+                const int g0 = (pixel & 0xff00) * a;
+                const int r0 = (pixel & 0xff0000) * a;
+                for (; x1 <= x2; ++x1)
+                {
+                    const unsigned int b = (b0 + (*q & 0xff) * a1) >> 8;
+                    const unsigned int g = (g0 + (*q & 0xff00) * a1) >> 8;
+                    const unsigned int r = (r0 + (*q & 0xff0000) * a1) >> 8;
+                    *q = (b & 0xff) | (g & 0xff00) | (r & 0xff0000);
+
+                    q++;
+                }
+            }
+            else
+            {
+                for (; x1 <= x2; ++x1)
+                    *(q++) = pixel;
+            }
+            break;
+        }
+        default:
+            break;
+    }  // end switch
+
+    SDL_UnlockSurface(mTarget);
+}
+
+void SDLGraphics::drawVLine(int x, int y1, int y2)
+{
+    if (mClipStack.empty())
+        return;
+
+    const gcn::ClipRectangle& top = mClipStack.top();
+
+    const int yOffset = top.yOffset;
+    x += top.xOffset;
+    y1 += yOffset;
+    y2 += yOffset;
+
+    if (x < top.x || x >= top.x + top.width)
+        return;
+
+    if (y1 > y2)
+    {
+        y1 ^= y2;
+        y2 ^= y1;
+        y1 ^= y2;
+    }
+
+    if (top.y > y1)
+    {
+        if (top.y > y2)
+            return;
+
+        y1 = top.y;
+    }
+
+    const int sumY = top.y + top.height;
+    if (sumY <= y2)
+    {
+        if (sumY <= y1)
+            return;
+
+        y2 = sumY - 1;
+    }
+
+    const int bpp = mTarget->format->BytesPerPixel;
+
+    SDL_LockSurface(mTarget);
+
+    uint8_t *p = static_cast<uint8_t*>(mTarget->pixels)
+        + y1 * mTarget->pitch + x * bpp;
+
+    const uint32_t pixel = SDL_MapRGB(mTarget->format,
+        static_cast<uint8_t>(mColor.r),
+        static_cast<uint8_t>(mColor.g),
+        static_cast<uint8_t>(mColor.b));
+
+    const int pitch = mTarget->pitch;
+    switch (bpp)
+    {
+        case 1:
+            for (; y1 <= y2; ++y1)
+            {
+                *p = static_cast<uint8_t>(pixel);
+                p += pitch;
+            }
+            break;
+
+        case 2:
+            for (; y1 <= y2; ++ y1)
+            {
+                *reinterpret_cast<uint16_t*>(p)
+                    = static_cast<uint16_t>(pixel);
+                p += pitch;
+            }
+            break;
+
+        case 3:
+        {
+            const uint8_t b0 = static_cast<uint8_t>((pixel >> 16) & 0xff);
+            const uint8_t b1 = static_cast<uint8_t>((pixel >> 8) & 0xff);
+            const uint8_t b2 = static_cast<uint8_t>(pixel & 0xff);
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+            for (; y1 <= y2; ++y1)
+            {
+                p[0] = b0;
+                p[1] = b1;
+                p[2] = b2;
+                p += pitch;
+            }
+#else
+            for (; y1 <= y2; ++y1)
+            {
+                p[0] = b2;
+                p[1] = b1;
+                p[2] = b0;
+                p += pitch;
+            }
+#endif
+            break;
+        }
+
+        case 4:
+        {
+            if (mAlpha)
+            {
+                unsigned char a = static_cast<unsigned char>(mColor.a);
+                unsigned char a1 = 255 - a;
+                const int b0 = (pixel & 0xff) * a;
+                const int g0 = (pixel & 0xff00) * a;
+                const int r0 = (pixel & 0xff0000) * a;
+                for (; y1 <= y2; ++y1)
+                {
+                    const unsigned int dst = *reinterpret_cast<uint32_t*>(p);
+                    const unsigned int b = (b0 + (dst & 0xff) * a1) >> 8;
+                    const unsigned int g = (g0 + (dst & 0xff00) * a1) >> 8;
+                    const unsigned int r = (r0 + (dst & 0xff0000) * a1) >> 8;
+                    *reinterpret_cast<uint32_t*>(p) =
+                        (b & 0xff) | (g & 0xff00) | (r & 0xff0000);
+
+                    p += pitch;
+                }
+            }
+            else
+            {
+                for (; y1 <= y2; ++y1)
+                {
+                    *reinterpret_cast<uint32_t*>(p) = pixel;
+                    p += pitch;
+                }
+            }
+            break;
+        }
+
+        default:
+            break;
+    }  // end switch
+
+    SDL_UnlockSurface(mTarget);
+}
+
+void SDLGraphics::drawRectangle(const gcn::Rectangle &rectangle)
+{
+    const int x1 = rectangle.x;
+    const int x2 = x1 + rectangle.width - 1;
+    const int y1 = rectangle.y;
+    const int y2 = y1 + rectangle.height - 1;
+
+    drawHLine(x1, y1, x2);
+    drawHLine(x1, y2, x2);
+
+    drawVLine(x1, y1, y2);
+    drawVLine(x2, y1, y2);
+}
+
+void SDLGraphics::drawLine(int x1, int y1, int x2, int y2)
+{
+    if (x1 == x2)
+    {
+        drawVLine(x1, y1, y2);
+        return;
+    }
+    if (y1 == y2)
+    {
+        drawHLine(x1, y1, x2);
+        return;
+    }
+
+    //  other cases not implimented
+}
+
+bool SDLGraphics::setVideoMode(const int w, const int h, const int bpp,
+                               const bool fs, const bool hwaccel,
+                               const bool resize, const bool noFrame)
+{
+    setMainFlags(w, h, bpp, fs, hwaccel, resize, noFrame);
+
+    if (!(mTarget = SDL_SetVideoMode(w, h, bpp, getSoftwareFlags())))
+        return false;
+
+    mRect.w = static_cast<uint16_t>(mTarget->w);
+    mRect.h = static_cast<uint16_t>(mTarget->h);
+
+    return videoInfo();
+}
+
+#endif  // USE_SDL2