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/*! \mainpage SDL_gfx - SDL graphics drawing primitives, rotozoom and other supporting functions \section contact_sec Contact and License Email aschiffler at ferzkopp.net to contact the author or better check author's homepage at http://www.ferzkopp.net for the most up-to-date contact information. This library is licenced under the LGPL, see the file LICENSE for details. LGPL (c) A. Schiffler \section intro_sec Introduction The SDL_gfx library evolved out of the SDL_gfxPrimitives code which provided basic drawing routines such as lines, circles or polygons for SDL Surfaces and adding a couple other useful functions for zooming images for example and doing basic image processing on byte arrays. The current components of the SDL_gfx library are: - Graphic Primitives (SDL_gfxPrimitives.h, SDL_gfxPrimitives.c) - Rotozoomer (SDL_rotozoom.h, SDL_rotozoom.c) - Framerate control (SDL_framerate.h, SDL_framerate.c) - MMX image filters (SDL_imageFilter.h, SDL_imageFilter.c) - Custom Blit functions (SDL_gfxBlitFunc.h, SDL_gfxBlitFunc.c) - Build-in 8x8 Font (SDL_gfxPrimitives_font.h) \subsection notes_gfx Notes on Graphics Primitives Care has been taken so that all routines are fully alpha-aware and can blend any primitive onto the target surface if ALPHA<255. Surface depths supported are 1,2,3 and 4 bytes per pixel. Surface locking is implemented in each routine and the library should work well with hardware accelerated surfaces. \htmlonly <a href="../Screenshots/SDL_gfxPrimitives.jpg" target="_blank" title="SDL_gfxPrimitives Screenshot"><img src="../Screenshots/SDL_gfxPrimitives-thumb.jpg" border="0" hspace="5"></a><br /> \endhtmlonly Currently, The following Anti-Aliased drawing primitives are available: - AA-line - AA-polygon - AA-circle - AA-ellipse Note: All ___Color routines expect the color to be in the format 0xRRGGBBAA. \subsection notes_roto Notes on Rotozoomer The rotozoom code is not ASSEMBLY quality - but it should be fast enough even for some realtime effects if the CPU is good or bitmaps small. With interpolation the routines are typically used for pre-rendering stuff in higher quality (i.e. smoothing) - that's also the reason why the API differs from SDL_BlitRect() - as they create a new target surface each time rotozoom is called. The final rendering speed is dependent on the target surface size as it is beeing xy-scanned when rendering the new surface. \htmlonly <a href="../Screenshots/SDL_rotozoom.jpg" target="_blank" title="SDL_rotozoom Screenshot"><img src="../Screenshots/SDL_rotozoom-thumb.jpg" border="0" hspace="5"></a><br /> \endhtmlonly Note also that the smoothing toggle is dependent on the input surface bit depth. 8bit surfaces will \b never be smoothed - only 32bit surfaces will. Note that surfaces of other bit depth then 8 and 32 will be converted on the fly to a 32bit surface using a blit into a temporary surface. This impacts performance somewhat. Smoothing (interpolation) flags work only on 32bit surfaces: \verbatim #define SMOOTHING_OFF 0 #define SMOOTHING_ON 1 \endverbatim \subsection notes_rate Notes on Framerate Manager The framerate functions are used to insert delays into the graphics loop to maintain a constant framerate. The implementation is more sophisticated that the usual \verbatim SDL_Delay(1000/FPS); \endverbatim call since these functions keep track of the desired game time per frame for a linearly interpolated sequence of future timing points of each frame. This is done to avoid rounding errors from the inherent instability in the delay generation and application. \htmlonly <a href="../framerate.png" target="_blank" title="Framerate Diagram"><img src="../framerate-thumb.png" border="0"></a><br /> \endhtmlonly i.e. the 100th frame of a game running at 50Hz will be accurately 2.00sec after the 1st frame (if the machine can keep up with the drawing). The functions return 0 or 'value' for sucess and -1 for error. All functions use a pointer to a framerate-manager variable to operate. \subsection notes_filter Notes on ImageFilters The imagefilter functions are a collection of MMX optimized routines that operate on continuous buffers of bytes - typically greyscale images from framegrabbers and such - performing functions such as image addition and binarization. All functions (almost ... not the the convolution routines) have a C implementation that is automatically used on systems without MMX capabilities. The compiler flag -DUSE_MMX toggles the conditional compile of MMX assembly. An assembler must be installed (i.e. "nasm"). \subsection platforms Supported Platforms \subsubsection platformlinux Unix/Linux The library compiles and is tested for a Linux target (gcc compiler) via the the usual configure;make;make install sequence. \subsubsection platformwindows Windows A Win32 target is available (VisualC6/7/8/9, mingw32, xmingw32 cross-compiler). The SDL_gfx.sln will open in VS2008 and VS2010 including express versions. See "Other Builds" for additional makefiles (may be out of date). When using the cross-compiler (available on the author's homepage, slightly out of date), the build process generates .DLLs. You can use the command line 'LIB.EXE' tool to generate VC6 compatible .LIB files for linking purposes. \subsubsection platformosx Mac OSX Xcode is supported via templates. See "Other Builds" folder Xcode3+.zip - this template only supports SDL_gfx and not the tests. For this template, the Deployment Target (the lowest version to run on) is set to 10.5 and expects the SDL.framework preinstalled in some default location (either /Library/Frameworks, or ~/Library/Frameworks). Older targets are also reported to work (10.3+ native and Project Builder). \subsubsection platformqnx QNX QNX is reported to build well (see .diff in "Other Builds"). \subsubsection platformzune Zune ZuneHD (WinCE 6 ARM) is reported to build (see OpenZDK in "Other Builds"). Note that between rendering on the Zune's ARM CPU and constantly uploading textures to the GPU, SDL_gfx is going to be slow. Also, the libc math functions all use software FP emulation even when VFP floating point support is turned on in the compiler, so there's extra overhead due to that as well. \subsubsection platformothers Others Other platforms might work but have not been tested by the author. Please check the file "INSTALL" as well as the folder "Other Builds". See also section "Installation" below for more build instructions. \section install_sec Installation \subsection unix Unix/Linux To compile the library your need the SDL 1.2 installed from source or installed with the 'devel' RPM package. For example on Mandriva, run: \verbatim urpmi libSDL1.2-devel \endverbatim Then run \verbatim ./autogen.sh # (optional) ./configure make make install ldconfig \endverbatim to compile and install the library. The default location for the installation is /usr/local/lib and /usr/local/include. The libary path might need to be added to the file: /etc/ld.so.conf Run the shell script 'nodebug.sh' before make, to patch the makefile for optimized compilation: \verbatim ./autogen.sh # (optional) ./configure ./nodebug.sh make make install ldconfig \endverbatim Check the folder "Other Builds" for alternative makefiles. \subsection prep Build Prep Run autogen.sh or manually: \verbatim aclocal --force libtoolize --force --copy autoreconf -fvi \endverbatim \subsection nommx No-MMX To build without MMX code enabled (i.e. PPC or for AMD64 architecture which is missing pusha/popa): \verbatim ./configure --disable-mmx make make install \endverbatim i.e. to build on MacOSX 10.3+ use: \verbatim ./configure --disable-mmx && make \endverbatim \subsection vs9 Windows (VC9) Open solution file and review README. \subsection vc6 Windows (VC6/7) See folder Other Builds. To create a Windows DLL using VisualC6: \verbatim unzip -a VisualC6.zip vcvars32.bat copy VisualC/makefile nmake \endverbatim or \verbatim unzip -a VisualC7.zip \endverbatim and open the project file. \subsection wince WindowsCE See folder Other Builds. May need workaround for missing lrint. \subsection cross Cross-Compilation To build using mingw32 on Win32, check the makefile contained in mingw.zip To create a Windows DLL using the xmingw32 cross-compiler: \verbatim cross-configure cross-make cross-make install \endverbatim Make sure the -DBUILD_DLL is used (and only then) when creating the DLLs. Make sure -DWIN32 is used when compiling the sources (creating or using the DLLs. Specify the path to your cross-compiled 'sdl-config', and invoke './configure' with the '--host' and '--build' arguments. For example, to cross-compile a .DLL from GNU/Linux: \verbatim SDL_CONFIG=/usr/local/cross-tools/i386-mingw32msvc/bin/sdl-config \ ./configure --host=i586-mingw32msvc --build=i686-pc-linux-gnu make make install \endverbatim \subsection qnx QNX To build on QNX6, patch first using: \verbatim patch -p0 <QNX.diff \endverbatim \subsection osx OSX Use standard unix build sequence. To build on MacOS X with Project Builder, follow these steps: - Update your developer tools to the lastest version. - Install the SDL Developers framework for Mac OS X. - Download the latest SDL_gfx source distribution and extract the archive in a convenient location. - Extract the included OSX-PB.tgz archive into the top directory of the SDL_gfx distribution (from step 3). This will create a PB that contains the project files. - The project has targets for the SDL_gfx framework and the four test programs. All can be built using the 'deployment' or 'development' build styles. A newer version for MaxOS X is included in the OSX-PB-XCode.zip archive. The updated version uses relative pathnames where appropriate, and pointers to the standard installation location of SDL. However, it may require XCode in order to be used. \section interfaces_sec Language Interfaces SDL_gfx has been integrated with the following language interfaces: - Pascal: http://www.freepascal-meets-sdl.net - Perl: http://sdl.perl.org - Python: http://www.pygame.org - C#: http://cs-sdl.sourceforge.net \section test_sec Test Programs Change to the ./Test directory and run \verbatim ./configure make \endverbatim to create several test programs for the libraries functions. This requires the library to be compiled and installed. See the source code .c files for some sample code and implementation hints. \section contrib_sec Contributors - Fix for filledbox by Ingo van Lil, inguin at gmx.de - thanks Ingo. - Non-alpha line drawing code adapted from routine by Pete Shinners, pete at shinners.org - thanks Pete. - More fixes by Karl Bartel, karlb at gmx.net - thanks Karl. - Much testing and suggestions for fixes from Danny van Bruggen, danny at froukepc.dhs.org - thanks Danny. - Original AA-circle/-ellipse code idea from Stephane Magnenat, nct at wg0.ysagoon.com - thanks Stephane. - Faster blending routines contributed by Anders Lindstroem, cal at swipnet.se - thanks Anders. - New AA-circle/-ellipse code based on ideas from Anders Lindstroem - thanks Anders. - VisualC makefile contributed by Danny van Bruggen, danny at froukepc.dhs.org - thanks Danny. - VisualC7 project file contributed by James Turk, jturk at conceptofzero.com - thanks James. - Project Builder package contributed by Thomas Tongue, TTongue at imagiware.com - Thanks Thomas. - Fix for filledPolygon contributed by Kentaro Fukuchi fukuchi at is.titech.ac.jp - Thanks Kentaro. - QNX6 patch contributed by Mike Gorchak, mike at malva.ua - Thanks Mike. - Pie idea contributed by Eike Lange, eike.lange at uni-essen.de - Thanks Eike. - Dynamic font setup by Todor Prokopov, koprok at dir.bg - Thanks Todor. - Horizontal/Vertical flipping code by Victor (Haypo) Stinner, victor.stinner at haypocalc.com - Thanks Victor. - OSX build fixes by Michael Wybrow, mjwybrow at cs.mu.oz.au - Thanks Michael. - gcc3.4 build fixes by Dries Verachtert, dries at ulyssis.org - Thanks Dries. - Updated OSX build by Brian Rice, water451 at gmail.com - Thanks Brian. - aaellipse issues pointed out by Marco Wertz, marco.wertz at gmx.de - Thanks Marco. - texturedPolygon idea and code by Kees Jongenburger, kees.jongenburger at gmail.com - Thanks Kees. - Several bugfixes contributed by Sigborn Skjaeret, cisc at broadpark.no - Thanks CISC. - Syntax error for C++ found by Olivier Boudeville, olivier.boudeville at online.fr - Thanks Olivier. - hline/vline clipping fixes found by Daniel Roggen, droggen at gmail.com and Mikael Thieme, mikael.thieme at his.se - Thanks Daniel+Mikael. - rotozoom fix for big-endian machines (i.e. PPC) by Julian Mayer, julianmayer at mac.com - Thanks Julian. - Cross-compilation notes contributed by Sylvain Beucler, beuc at beuc.net - Thanks Sylvain. - Fix duplicate pixel renders in circleColor contributed by David Raber, lotharstar at gmail.com - Thanks David. - New arcColor (and arcRGBA) routine contributed by David Raber, lotharstar at gmail.com - Thanks David. - Idea for polygonColorMT and texturePolygonMT routines for multithreaded operation contributed by "unknown" - Thank you. - Multiple patches applied and repackaged version 2.0.18 by Paul, sweetlilmre at gmail.com - Thanks Paul and other contributors of patches. - Change to avoid gcc4 compiler warnings contributed by Thien-Thi nguyen, ttn at gnuvola.org - thanks Thi. - hline 1bpp off-by-one patch contributed by Manuel Lausch mail at manuellausch.de - Thanks Manuel. - pkg-config support contributed by Luca Bigliardi, shammash at artha.org - thanks Luca. - Updated mingw Makefile contributed by Jan Leike, jan dot leike at gmx dot net - thanks Jan. - Rotozoom debugging help by Jeff Wilges, heff at ifup dot us - thanks Jeff. - Build updates provided by Barry deFreese, bdefreese at debian dot org - thanks Barry. - Fix for 1-pixel postponement with 8bit scaling by Sylvain Beucler, beuc at beuc dot net - thanks Sylvain. - Updates to headers and configure to allow for cross-compiling to DLL (not just static .a) and fixes for compiling on Windows using autotools by Sylvain Beucler, beuc at beuc dot net - thanks Sylvain. - Added Visual CE Project to Builds. Contributed by vrichomme at smartmobili dot com - thanks. - Added Symbian and Windows 64bit fix with lrint function by Rene Dudfield, renesd at gmail dot com - thanks Rene. - Fixes for Rotate90 0-degree case by Chris Allport, chris dot allport at gmail dot com - thanks Chris. - Fixed for Win32 build support defines by tigerfishdaisy (SF) - thanks Tiger Tiger. - Patch for OpenSDK contributed by itsnotabigtruck at ovi dot com - thanks IsNotABigTruck. - OSX Xcode 3+ template ZIP contributed by marabus at meta dot ua - thanks Vasyl. \section changelog_sec Change Log \verbinclude ChangeLog */