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dingux-graphics.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 (at your option) 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-2-1/backends/platform/dingux/dingux-graphics.cpp $
 * $Id: dingux-graphics.cpp 52422 2010-08-28 08:07:10Z hkz $
 *
 */

#include "backends/platform/dingux/dingux.h"

#include "common/mutex.h"
#include "graphics/scaler.h"
#include "graphics/scaler/aspect.h"
#include "graphics/scaler/downscaler.h"
#include "graphics/surface.h"

#if defined (DINGUX)

static const OSystem::GraphicsMode s_supportedGraphicsModes[] = {
      {"1x", "Standard", GFX_NORMAL},
      {0, 0, 0}
};

int OSystem_SDL_Dingux::getDefaultGraphicsMode() const {
      return GFX_NORMAL;
}

const OSystem::GraphicsMode *OSystem_SDL_Dingux::getSupportedGraphicsModes() const {
      return s_supportedGraphicsModes;
}

bool OSystem_SDL_Dingux::setGraphicsMode(int mode) {
      Common::StackLock lock(_graphicsMutex);

      assert(_transactionMode == kTransactionActive);

      if (_oldVideoMode.setup && _oldVideoMode.mode == mode)
            return true;

      int newScaleFactor = 1;

      switch (mode) {
      case GFX_NORMAL:
            newScaleFactor = 1;
            break;
      case GFX_HALF:
            newScaleFactor = 1;
            break;
      default:
            warning("unknown gfx mode %d", mode);
            return false;
      }

      _transactionDetails.normal1xScaler = (mode == GFX_NORMAL);
      if (_oldVideoMode.setup && _oldVideoMode.scaleFactor != newScaleFactor)
            _transactionDetails.needHotswap = true;

      _transactionDetails.needUpdatescreen = true;

      _videoMode.mode = mode;
      _videoMode.scaleFactor = newScaleFactor;

      return true;
}

void OSystem_SDL_Dingux::setGraphicsModeIntern() {
      Common::StackLock lock(_graphicsMutex);
      ScalerProc *newScalerProc = 0;

      switch (_videoMode.mode) {
      case GFX_NORMAL:
            newScalerProc = Normal1x;
            break;
      case GFX_HALF:
            newScalerProc = DownscaleAllByHalf;
            break;

      default:
            error("Unknown gfx mode %d", _videoMode.mode);
      }

      _scalerProc = newScalerProc;

      if (!_screen || !_hwscreen)
            return;

      // Blit everything to the screen
      _forceFull = true;

      // Even if the old and new scale factors are the same, we may have a
      // different scaler for the cursor now.
      blitCursor();
}

void OSystem_SDL_Dingux::initSize(uint w, uint h) {
      assert(_transactionMode == kTransactionActive);

      // Avoid redundant res changes
      if ((int)w == _videoMode.screenWidth && (int)h == _videoMode.screenHeight)
            return;

      _videoMode.screenWidth = w;
      _videoMode.screenHeight = h;
      if (w > 320 || h > 240) {
            setGraphicsMode(GFX_HALF);
            setGraphicsModeIntern();
            toggleMouseGrab();
      }

      _transactionDetails.sizeChanged = true;
}

void OSystem_SDL_Dingux::drawMouse() {
      if (!_mouseVisible || !_mouseSurface) {
            _mouseBackup.x = _mouseBackup.y = _mouseBackup.w = _mouseBackup.h = 0;
            return;
      }

      SDL_Rect dst;
      int scale;
      int hotX, hotY;

      if (_videoMode.mode == GFX_HALF && !_overlayVisible) {
            dst.x = _mouseCurState.x / 2;
            dst.y = _mouseCurState.y / 2;
      } else {
            dst.x = _mouseCurState.x;
            dst.y = _mouseCurState.y;
      }

      if (!_overlayVisible) {
            scale = _videoMode.scaleFactor;
            dst.w = _mouseCurState.vW;
            dst.h = _mouseCurState.vH;
            hotX = _mouseCurState.vHotX;
            hotY = _mouseCurState.vHotY;
      } else {
            scale = 1;
            dst.w = _mouseCurState.rW;
            dst.h = _mouseCurState.rH;
            hotX = _mouseCurState.rHotX;
            hotY = _mouseCurState.rHotY;
      }

      // The mouse is undrawn using virtual coordinates, i.e. they may be
      // scaled and aspect-ratio corrected.

      _mouseBackup.x = dst.x - hotX;
      _mouseBackup.y = dst.y - hotY;
      _mouseBackup.w = dst.w;
      _mouseBackup.h = dst.h;

      // We draw the pre-scaled cursor image, so now we need to adjust for
      // scaling, shake position and aspect ratio correction manually.

      if (!_overlayVisible) {
            dst.y += _currentShakePos;
      }

      if (_videoMode.aspectRatioCorrection && !_overlayVisible)
            dst.y = real2Aspect(dst.y);

      dst.x = scale * dst.x - _mouseCurState.rHotX;
      dst.y = scale * dst.y - _mouseCurState.rHotY;
      dst.w = _mouseCurState.rW;
      dst.h = _mouseCurState.rH;

      // Note that SDL_BlitSurface() and addDirtyRect() will both perform any
      // clipping necessary

      if (SDL_BlitSurface(_mouseSurface, NULL, _hwscreen, &dst) != 0)
            error("SDL_BlitSurface failed: %s", SDL_GetError());

      // The screen will be updated using real surface coordinates, i.e.
      // they will not be scaled or aspect-ratio corrected.
      addDirtyRect(dst.x, dst.y, dst.w, dst.h, true);
}

void OSystem_SDL_Dingux::undrawMouse() {
      const int x = _mouseBackup.x;
      const int y = _mouseBackup.y;

      // When we switch bigger overlay off mouse jumps. Argh!
      // This is intended to prevent undrawing offscreen mouse
      if (!_overlayVisible && (x >= _videoMode.screenWidth || y >= _videoMode.screenHeight))
            return;

      if (_mouseBackup.w != 0 && _mouseBackup.h != 0) {
            if (_videoMode.mode == GFX_HALF && !_overlayVisible) {
                  addDirtyRect(x*2, y*2, _mouseBackup.w*2, _mouseBackup.h*2);
            } else {
                  addDirtyRect(x, y, _mouseBackup.w, _mouseBackup.h);
            }
      }
}

void OSystem_SDL_Dingux::internUpdateScreen() {
      SDL_Surface *srcSurf, *origSurf;
      int height, width;
      ScalerProc *scalerProc;
      int scale1;

#if defined (DEBUG) && ! defined(_WIN32_WCE) // definitions not available for non-DEBUG here. (needed this to compile in SYMBIAN32 & linux?)
      assert(_hwscreen != NULL);
      assert(_hwscreen->map->sw_data != NULL);
#endif

      // If the shake position changed, fill the dirty area with blackness
      if (_currentShakePos != _newShakePos) {
            SDL_Rect blackrect = {0, 0, _videoMode.screenWidth * _videoMode.scaleFactor, _newShakePos * _videoMode.scaleFactor};

            if (_videoMode.aspectRatioCorrection && !_overlayVisible)
                  blackrect.h = real2Aspect(blackrect.h - 1) + 1;

            SDL_FillRect(_hwscreen, &blackrect, 0);

            _currentShakePos = _newShakePos;

            _forceFull = true;
      }

      // Check whether the palette was changed in the meantime and update the
      // screen surface accordingly.
      if (_screen && _paletteDirtyEnd != 0) {
            SDL_SetColors(_screen, _currentPalette + _paletteDirtyStart,
                          _paletteDirtyStart,
                          _paletteDirtyEnd - _paletteDirtyStart);

            _paletteDirtyEnd = 0;

            _forceFull = true;
      }

#ifdef USE_OSD
      // OSD visible (i.e. non-transparent)?
      if (_osdAlpha != SDL_ALPHA_TRANSPARENT) {
            // Updated alpha value
            const int diff = SDL_GetTicks() - _osdFadeStartTime;
            if (diff > 0) {
                  if (diff >= kOSDFadeOutDuration) {
                        // Back to full transparency
                        _osdAlpha = SDL_ALPHA_TRANSPARENT;
                  } else {
                        // Do a linear fade out...
                        const int startAlpha = SDL_ALPHA_TRANSPARENT + kOSDInitialAlpha * (SDL_ALPHA_OPAQUE - SDL_ALPHA_TRANSPARENT) / 100;
                        _osdAlpha = startAlpha + diff * (SDL_ALPHA_TRANSPARENT - startAlpha) / kOSDFadeOutDuration;
                  }
                  SDL_SetAlpha(_osdSurface, SDL_RLEACCEL | SDL_SRCCOLORKEY | SDL_SRCALPHA, _osdAlpha);
                  _forceFull = true;
            }
      }
#endif

      if (!_overlayVisible) {
            origSurf = _screen;
            srcSurf = _tmpscreen;
            width = _videoMode.screenWidth;
            height = _videoMode.screenHeight;
            scalerProc = _scalerProc;
            scale1 = _videoMode.scaleFactor;
      } else {
            origSurf = _overlayscreen;
            srcSurf = _tmpscreen2;
            width = _videoMode.overlayWidth;
            height = _videoMode.overlayHeight;
            scalerProc = Normal1x;
            scale1 = 1;
      }

      // Add the area covered by the mouse cursor to the list of dirty rects if
      // we have to redraw the mouse.
      if (_mouseNeedsRedraw)
            undrawMouse();

      // Force a full redraw if requested
      if (_forceFull) {
            _numDirtyRects = 1;
            _dirtyRectList[0].x = 0;
            _dirtyRectList[0].y = 0;
            _dirtyRectList[0].w = width;
            _dirtyRectList[0].h = height;
      }

      // Only draw anything if necessary
      if (_numDirtyRects > 0 || _mouseNeedsRedraw) {
            SDL_Rect *r;
            SDL_Rect dst;
            uint32 srcPitch, dstPitch;
            SDL_Rect *lastRect = _dirtyRectList + _numDirtyRects;

            for (r = _dirtyRectList; r != lastRect; ++r) {
                  dst = *r;
                  dst.x++;    // Shift rect by one since 2xSai needs to access the data around
                  dst.y++;    // any pixel to scale it, and we want to avoid mem access crashes.

                  if (SDL_BlitSurface(origSurf, r, srcSurf, &dst) != 0)
                        error("SDL_BlitSurface failed: %s", SDL_GetError());
            }

            SDL_LockSurface(srcSurf);
            SDL_LockSurface(_hwscreen);

            srcPitch = srcSurf->pitch;
            dstPitch = _hwscreen->pitch;

            for (r = _dirtyRectList; r != lastRect; ++r) {
                  register int dst_y = r->y + _currentShakePos;
                  register int dst_h = 0;
                  register int dst_w = r->w;
                  register int orig_dst_y = 0;
                  register int dst_x = r->x;
                  register int src_y;
                  register int src_x;

                  if (dst_y < height) {
                        dst_h = r->h;
                        if (dst_h > height - dst_y)
                              dst_h = height - dst_y;

                        orig_dst_y = dst_y;
                        src_x = dst_x;
                        src_y = dst_y;

                        if (_videoMode.aspectRatioCorrection && !_overlayVisible)
                              dst_y = real2Aspect(dst_y);

                        assert(scalerProc != NULL);

                        if ((_videoMode.mode == GFX_HALF) && (scalerProc == DownscaleAllByHalf)) {
                              if (dst_x % 2 == 1) {
                                    dst_x--;
                                    dst_w++;
                              }
                              if (dst_y % 2 == 1) {
                                    dst_y--;
                                    dst_h++;
                              }
                              src_x = dst_x;
                              src_y = dst_y;
                              dst_x = dst_x / 2;
                              dst_y = dst_y / 2;

                              scalerProc((byte *)srcSurf->pixels + (src_x * 2 + 2) + (src_y + 1) * srcPitch, srcPitch,
                                         (byte *)_hwscreen->pixels + dst_x * 2 + dst_y * dstPitch, dstPitch, dst_w, dst_h);

                        } else {
                              scalerProc((byte *)srcSurf->pixels + (r->x * 2 + 2) + (r->y + 1) * srcPitch, srcPitch,
                                         (byte *)_hwscreen->pixels + r->x * 2 + dst_y * dstPitch, dstPitch, r->w, dst_h);
                        }
                  }

                  if (_videoMode.mode == GFX_HALF && scalerProc == DownscaleAllByHalf) {
                        r->w = r->w / 2;
                        r->h = dst_h / 2;
                  } else {
                        r->w = r->w;
                        r->h = dst_h;
                  }

                  r->x = dst_x;
                  r->y = dst_y;


#ifdef USE_SCALERS
                  if (_videoMode.aspectRatioCorrection && orig_dst_y < height && !_overlayVisible)
                        r->h = stretch200To240((uint8 *) _hwscreen->pixels, dstPitch, r->w, r->h, r->x, r->y, orig_dst_y * scale1);
#endif
            }
            SDL_UnlockSurface(srcSurf);
            SDL_UnlockSurface(_hwscreen);

            // Readjust the dirty rect list in case we are doing a full update.
            // This is necessary if shaking is active.
            if (_forceFull) {
                  _dirtyRectList[0].y = 0;
                  _dirtyRectList[0].h = (_videoMode.mode == GFX_HALF) ? effectiveScreenHeight() / 2 : effectiveScreenHeight();
            }

            drawMouse();

#ifdef USE_OSD
            if (_osdAlpha != SDL_ALPHA_TRANSPARENT) {
                  SDL_BlitSurface(_osdSurface, 0, _hwscreen, 0);
            }
#endif
            // Finally, blit all our changes to the screen
            SDL_UpdateRects(_hwscreen, _numDirtyRects, _dirtyRectList);
      }

      _numDirtyRects = 0;
      _forceFull = false;
      _mouseNeedsRedraw = false;
}

void OSystem_SDL_Dingux::showOverlay() {
      if (_videoMode.mode == GFX_HALF) {
            _mouseCurState.x = _mouseCurState.x / 2;
            _mouseCurState.y = _mouseCurState.y / 2;
      }
      OSystem_SDL::showOverlay();
}

void OSystem_SDL_Dingux::hideOverlay() {
      if (_videoMode.mode == GFX_HALF) {
            _mouseCurState.x = _mouseCurState.x * 2;
            _mouseCurState.y = _mouseCurState.y * 2;
      }
      OSystem_SDL::hideOverlay();
}

bool OSystem_SDL_Dingux::loadGFXMode() {

      // Forcefully disable aspect ratio correction for games
      // which starts with a native 240px height resolution.
      // This fixes games with weird resolutions, like MM Nes (256x240)
      if(_videoMode.screenHeight == 240) {
            _videoMode.aspectRatioCorrection = false;
      }

      fprintf(stdout, "Game ScreenMode = %d*%d\n", _videoMode.screenWidth, _videoMode.screenHeight);
      if (_videoMode.screenWidth > 320 || _videoMode.screenHeight > 240) {
            _videoMode.aspectRatioCorrection = false;
            setGraphicsMode(GFX_HALF);
            fprintf(stdout, "GraphicsMode set to HALF\n");
      } else {
            setGraphicsMode(GFX_NORMAL);
            fprintf(stdout, "GraphicsMode set to NORMAL\n");
      }

      if ((_videoMode.mode == GFX_HALF) && !_overlayVisible) {
            _videoMode.overlayWidth = _videoMode.screenWidth / 2;
            _videoMode.overlayHeight = _videoMode.screenHeight / 2;
            _videoMode.fullscreen = true;
      } else {

            _videoMode.overlayWidth = _videoMode.screenWidth * _videoMode.scaleFactor;
            _videoMode.overlayHeight = _videoMode.screenHeight * _videoMode.scaleFactor;

            if (_videoMode.aspectRatioCorrection)
                  _videoMode.overlayHeight = real2Aspect(_videoMode.overlayHeight);

            _videoMode.hardwareWidth = _videoMode.screenWidth * _videoMode.scaleFactor;
            _videoMode.hardwareHeight = effectiveScreenHeight();
      }


      return OSystem_SDL::loadGFXMode();
}

#endif


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