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Wednesday the 23rd of May 2012 @ 06:10pm

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LibN2L N2L Home Older News Downloads Documentation (n2l5) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Documentation (libN2L-4) Class Hierarchy Compound List File List n2l:: Members Functions Whole n2l:: Ref Bugtracker Project Page Report a Bug Bug List Related Things Life 2130 Devel Game Journal

LibN2L-4 Library Code Reference Classes Compounds Files Members Method Index Full Reference cSurfaceCommonImp.cpp Go to the documentation of this file. /************************************************************************ Nova-2 Library (libN2L, or simply n2l) Game development C++ Library Copyright (C) 2003 Aaron Cameron This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA A copy of the GNU Lesser General Public License has been provided with this library in the file 'COPYING'. Contact information for the author of this library has been provided with this library in the file 'AUTHOR'. ************************************************************************/ #include "cSurfaceCommonImp.h" namespace n2l { /* ************************************************************ */ cSurfaceCommonImp::cSurfaceCommonImp() : mOwned(true), mSurface(0), mReadLockCount(0), mWriteLockCount(0) { requireSDLSubSystem(SDLSubSystemInitFlag_Video); } /* ************************************************************ */ cSurfaceCommonImp::~cSurfaceCommonImp() { cSurfaceCommonImp::free(); releaseSDLSubSystem(SDLSubSystemInitFlag_Video); } /* ************************************************************ */ void cSurfaceCommonImp::blit( const tVector2s & iDestPos, const cSurfaceInterface & iSurface, const tRectangle2u & iSrcRect ) { if (empty()) throw cBadDataUseException( "cSurfaceCommonImp::blit", "Blitting to an empty surface" ); if (iSurface.empty()) throw cBadDataUseException( "cSurfaceCommonImp::blit", "Blitting from an empty surface" ); // Check for outstanding locks on either of the surfaces. // Build SDL rects SDL_Rect srcRect, destRect; srcRect.x = iSrcRect.x(); srcRect.y = iSrcRect.y(); srcRect.w = iSrcRect.w(); srcRect.h = iSrcRect.h(); if (srcRect.w==0) srcRect.w = iSurface.properties().size().x(); if (srcRect.h==0) srcRect.h = iSurface.properties().size().y(); destRect.x = iDestPos.x(); destRect.y = iDestPos.y(); // Do the actual blit if (-1==SDL_BlitSurface(iSurface.rawSurface(),&srcRect, mSurface,&destRect )) throw cSDLException("cSurfaceCommonImp::blit", "SDL BlitSurface failed"); } /* ************************************************************ */ const bool cSurfaceCommonImp::empty() const { return (0==mSurface); } /* ************************************************************ */ const cPixelFormat & cSurfaceCommonImp::format() const { return mFormat; } /* ************************************************************ */ const cSurfaceProperties & cSurfaceCommonImp::properties() const { return mProperties; } /* ************************************************************ */ const void * const cSurfaceCommonImp::aquireROBuffer() const { if (writeLocks()) return 0; if (empty()) throw cBadDataUseException( "cSurfaceCommonImp::aquireROBuffer", "There\'s no surface here to lock!" ); incReadLock(); SDL_Surface * const surfaceImpPtr = rawSurface(); // Do we have to do anything, or are we just book-keeping if (readLocks()>1) return surfaceImpPtr->pixels; // Do whatever we have to do to get access to the raw surface if (SDL_MUSTLOCK(surfaceImpPtr)) if (-1==SDL_LockSurface(surfaceImpPtr)) throw cSDLException( "cSurfaceCommonImp::aquireROBuffer", "Couldn\'t lock surface" ); // That's it. return surfaceImpPtr->pixels; } /* ************************************************************ */ void cSurfaceCommonImp::releaseROBuffer() const { if (0==readLocks()) throw cException( "cSurfaceCommonImp::releaseROBuffer", "Release of a non-existant lock" ); if (empty()) throw cBadDataUseException( "cSurfaceCommonImp::releaseROBuffer", "Surface implementation has gone away" ); // Do we do anything other than remove a reference count? if (readLocks()>1) { decReadLock(); return; } // Undo anything we had to emulate to get a raw surface (assuming this // is the last lock, that is) SDL_Surface * surfaceImpPtr( rawSurface() ); if (SDL_MUSTLOCK(surfaceImpPtr)) SDL_UnlockSurface(surfaceImpPtr); // That's it, move on. decReadLock(); } /* ************************************************************ */ const bool cSurfaceCommonImp::supportsRWBuffer() const { // For now. return false; } /* ************************************************************ */ void * const cSurfaceCommonImp::aquireRWBuffer() { // For now throw cUnsupportedMethodException( "cSurfaceCommonImp::aquireRWBuffer", "RW Buffers not supported" ); } /* ************************************************************ */ void cSurfaceCommonImp::releaseRWBuffer() const { // For now throw cUnsupportedMethodException( "cSurfaceCommonImp::releaseRWBuffer", "RW Buffers not supported" ); } /* ************************************************************ */ const bool cSurfaceCommonImp::surfaceIsSupported( const cPixelFormat & iFormat, // const cSurfaceProperties & ) const // iProperties { if (iFormat.bitsPerPixel()==8) return false; // Do an intensive test return true; } /* ************************************************************ */ void cSurfaceCommonImp::free() { if (empty()) return; if (mOwned) SDL_FreeSurface(mSurface); mSurface = 0; } /* ************************************************************ */ void cSurfaceCommonImp::setRawSurface( SDL_Surface * const ioSurface, const tBool iTakeOwnership ) { // Make sure that we have an empty surface reference free(); // Do it. mOwned = iTakeOwnership; mSurface = ioSurface; } /* ************************************************************ */ SDL_Surface * const cSurfaceCommonImp::rawSurface() const { return mSurface; } /* ************************************************************ */ void cSurfaceCommonImp::setFormat( const cPixelFormat & iFormat ) { mFormat.assign(iFormat); } /* ************************************************************ */ void cSurfaceCommonImp::setProperties( const cSurfaceProperties & iProperties ) { mProperties.assign(iProperties); } /* ************************************************************ */ const cSurfaceCommonImp::tLockCount cSurfaceCommonImp::readLocks() const { return mReadLockCount; } /* ************************************************************ */ const cSurfaceCommonImp::tLockCount cSurfaceCommonImp::writeLocks() const { return mWriteLockCount; } /* ************************************************************ */ void cSurfaceCommonImp::incReadLock() const { ++mReadLockCount; } /* ************************************************************ */ void cSurfaceCommonImp::incWriteLock() const { ++mWriteLockCount; } /* ************************************************************ */ void cSurfaceCommonImp::decReadLock() const { --mReadLockCount; } /* ************************************************************ */ void cSurfaceCommonImp::decWriteLock() const { --mWriteLockCount; } /* ************************************************************ */ void cSurfaceCommonImp::clearSurface( const tUint32 iPixelColour ) { if (empty()) throw cBadDataUseException( "cSurfaceCommonImp::clearSurface", "The surface is empty" ); SDL_FillRect( rawSurface(), 0, iPixelColour ); } /* ************************************************************ */ const tUint32 cSurfaceCommonImp::mapRGBA( const tUbyte iR, const tUbyte iG, const tUbyte iB, const tUbyte iA ) const { if (empty()) throw cBadDataUseException( "cSurfaceCommonImp::mapRGBA", "The surface is empty" ); return SDL_MapRGBA( rawSurface()->format, iR,iG,iB,iA ); } /* ************************************************************ */ const tUint32 cSurfaceCommonImp::mapRGB( const tUbyte iR, const tUbyte iG, const tUbyte iB ) const { if (empty()) throw cBadDataUseException( "cSurfaceCommonImp::mapRGB", "The surface is empty" ); return SDL_MapRGB( rawSurface()->format, iR,iG,iB ); } } // namespace

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