SDL_gfx Library

The SDL_gfx library evolved out of the SDL_gfxPrimitives code which provided basic drawing routines such as lines, circles or polygons and SDL_rotozoom which implemented a interpolating rotozoomer for SDL surfaces.

The current components of the SDL_gfx library are:

• Graphic Primitives (SDL_gfxPrimitves.h)
• Rotozoomer (SDL_rotozoom.h)
• Framerate control (SDL_framerate.h)
• MMX image filters (SDL_imageFilter.h)
• Custom Blit functions (SDL_gfxBlitFunc.h)
  

The library is backwards compatible to the above mentioned code. Its is written in plain C and can be used in C++ code.

(c) A. Schiffler, aschiffler [at] ferzkopp.net 1999-2008, licensed under the LGPL

 

SDL_gfx-2.0.13.tar.gz

SDL_gfx-2.0.13.zip

SDL_gfx-2.0.13-1.src.rpm

SDL_gfx-2.0.13-1.i386.rpm

SDL_gfx-devel-2.0.13-1.i386.rpm

SDL_gfx-demos-2.0.13-1.i386.rpm

SDL_gfx-debuginfo-2.0.13-1.i386.rpm

 

 

The library compiles and is tested for a Linux target (gcc compiler) and a Win32 target (VisualC, xmingw32 cross-compiler) as well as BeOS and MacOS X PowerBuilder See README for VC and PowerBuilder compile information. When using the cross-compiler (available on the author's homepage), the build process generates .DLLs. You can use the command line 'LIB.EXE' tool to generate VC6 compatible .LIB files for linking purposes.

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. Currently, The following Anti-Aliased drawing primitives are available:

• AA-line
• AA-circle
• AA-ellipse
• AA-polygon (not filled)

[[[ Interface ]]]

NOTE: This section of the webpage may be out of date. 

Please check README in archive and .h files for up-to-date interface information.

Note: all ___Color routines expect the color to be in format 0xRRGGBBAA 

Pixel 

int pixelColor(SDL_Surface * dst, Sint16 x, Sint16 y,
Uint32 color);
int pixelRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, Uint8 r,
Uint8 g, Uint8 b, Uint8 a);

Horizontal line 

int hlineColor(SDL_Surface * dst, Sint16 x1, Sint16 x2,
Sint16 y, Uint32 color);
int hlineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 x2,
Sint16 y, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Vertical line 

int vlineColor(SDL_Surface * dst, Sint16 x, Sint16 y1,
Sint16 y2, Uint32 color);
int vlineRGBA(SDL_Surface * dst, Sint16 x, Sint16 y1,
Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Rectangle 

int rectangleColor(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint32 color);
int rectangleRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint8 r, Uint8 g,
Uint8 b, Uint8 a);
Filled rectangle (Box) 
int boxColor(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint32 color);
int boxRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2,
Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Line 

int lineColor(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint32 color);
int lineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint8 r, Uint8 g, Uint8 b,
Uint8 a);

AA Line 

int aalineColor(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint32 color);
int aalineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint8 r, Uint8 g, Uint8 b,
Uint8 a);

Circle 

int circleColor(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 r, Uint32 color);
int circleRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rad, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

AA Circle 

int aacircleColor(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 r, Uint32 color);
int aacircleRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rad, Uint8 r, Uint8 g, Uint8 b,
Uint8 a);

Filled Circle 

int filledCircleColor(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 r, Uint32 color);
int filledCircleRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rad, Uint8 r, Uint8 g, Uint8 b,
Uint8 a);

Ellipse 

int ellipseColor(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint32 color);
int ellipseRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint8 r, Uint8 g,
Uint8 b, Uint8 a);

AA Ellipse 

int aaellipseColor(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint32 color);
int aaellipseRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint8 r, Uint8 g,
Uint8 b, Uint8 a);

Filled Ellipse 

int filledEllipseColor(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint32 color);
int filledEllipseRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint8 r, Uint8 g,
Uint8 b, Uint8 a);

Arc

int arcColor(SDL_Surface * dst, Sint16 x, Sint16 y, 
Sint16 r, Sint16 start, Sint16 end, Uint32 color);
int arcRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, 
Sint16 rad, Sint16 start, Sint16 end, Uint8 r, Uint8 g, Uint8 b, Uint8 a); 

Pie 

int pieColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rad,
Sint16 start, Sint16 end, Uint32 color);
int pieRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rad,
Sint16 start, Sint16 end, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Filled Pie 

int filledPieColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rad,
Sint16 start, Sint16 end, Uint32 color);
int filledPieRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rad,
Sint16 start, Sint16 end, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Trigon 

int trigonColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, 
Sint16 x3, Sint16 y3, Uint32 color);
int trigonRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, 
Sint16 x3, Sint16 y3,
Uint8 r, Uint8 g, Uint8 b, Uint8 a);

AA-Trigon

int aatrigonColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2,
Sint16 x3, Sint16 y3, Uint32 color);
int aatrigonRGBA(SDL_Surface * dst,  Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2,
Sint16 x3, Sint16 y3,
Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Filled Trigon

int filledTrigonColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2,
Sint16 y2, Sint16 x3, Sint16 y3, int color);
int filledTrigonRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2,
Sint16 y2, Sint16 x3, Sint16 y3,
Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Polygon 

int polygonColor(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, Uint32 color);
int polygonRGBA(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

AA-Polygon 

int aapolygonColor(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, Uint32 color);
int aapolygonRGBA(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Filled Polygon 

int filledPolygonColor(SDL_Surface * dst, Sint16 * vx,
Sint16 * vy, int n, int color);
int filledPolygonRGBA(SDL_Surface * dst, Sint16 * vx,
Sint16 * vy, int n, Uint8 r, Uint8 g,
Uint8 b, Uint8 a);

Textured Polygon 

int texturedPolygon(SDL_Surface * dst, Sint16 * vx, Sint16 * vy, int n, 
SDL_Surface *texture, int texture_dx, int texture_dy);

Bezier Curve

int bezierColor(SDL_Surface * dst, Sint16 * vx, 
Sint16 * vy, int n, int s, Uint32 color);
int bezierRGBA(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, int s, Uint8 r, Uint8 g, Uint8 b, Uint8 a);

Note: s is the number of steps to render. 

Characters/Strings 

int characterColor(SDL_Surface * dst, Sint16 x, Sint16 y,
char c, Uint32 color);
int characterRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
char c, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
int stringColor(SDL_Surface * dst, Sint16 x, Sint16 y, char *c,
Uint32 color);
int stringRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, char *c,
Uint8 r, Uint8 g, Uint8 b, Uint8 a);
void gfxPrimitivesSetFont(unsigned char *fontdata, int cw, int ch);

Note: Several font definitions are included. 

The rotozoom without interpolation code should be fast enough even for some realtime effects if the CPU is fast or bitmaps small. With interpolation the routines are typically used for pre-rendering stuff in higher quality (i.e. smoothing) - that's also a reason why the API differs from SDL_BlitRect() and creates 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.

Note also that the smoothing toggle is dependent on the input surface bit depth. 8bit surfaces will 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.

 

[[[ Interface ]]]

SDL_Surface * rotozoomSurface (SDL_Surface *src, double angle, double zoom, int smooth);

Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
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.

SDL_Surface * rotozoomSurfaceXY (SDL_Surface *src, double angle, double zoomx,
double zoomy, int smooth);

Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'angle' is the rotation in degrees. 'zoomx' and 'zoomy' are scaling factors that
can also be negative. In this case the corresponding axis is flipped.  If 'smooth' 
is 1 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.
Note: Flipping currently only works with antialiasing turned off.

SDL_Surface * zoomSurface (SDL_Surface *src, double zoomx, double zoomy, int smooth);

Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
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.
Smoothing (interpolation) flags work only on 32bit surfaces:
#define SMOOTHING_OFF		0
#define SMOOTHING_ON		1

SDL_Surface *shrinkSurface(SDL_Surface *src, int factorx, int factory);

 

Shrinks a 32bit or 8bit 'src' surface ti 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.

	SDL_Delay(1000/FPS);

The functions return 0 or value for sucess and -1 for error. All functions
use a pointer to a framerate-manager variable to operate.

void SDL_initFramerate(FPSmanager * manager);

Initialize the framerate manager, set default framerate of 30Hz and
reset delay interpolation.

int SDL_setFramerate(FPSmanager * manager, int rate);

Set a new framerate for the manager and reset delay interpolation.

int SDL_getFramerate(FPSmanager * manager);

Get the currently set framerate of the manager.

void SDL_framerateDelay(FPSmanager * manager);

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.

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.

 

[[[ Interface ]]]

Comments:                                                                           
1.) MMX functions work best if all data blocks are aligned on a 32 bytes boundary. 
2.) Data that is not within an 8 byte boundary is processed using the C routine.   
3.) Convolution routines do not have C routines at this time.                      
4.) All routines return 0 for OK and -1 for error.

Detect MMX capability in CPU
int SDL_imageFilterMMXdetect(void);

Force use of MMX off (or turn possible use back on)

void SDL_imageFilterMMXoff(void);
void SDL_imageFilterMMXon(void);

SDL_imageFilterAdd: D = saturation255(S1 + S2)
int SDL_imageFilterAdd (unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterMean: D = S1/2 + S2/2
int SDL_imageFilterMean(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterSub: D = saturation0(S1 - S2)
int SDL_imageFilterSub(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterAbsDiff: D = | S1 - S2 |
int SDL_imageFilterAbsDiff(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterMult: D = saturation(S1 * S2)
int SDL_imageFilterMult(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterMultNor: D = S1 * S2   (non-MMX)
int SDL_imageFilterMultNor(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterMultDivby2: D = saturation255(S1/2 * S2)
int SDL_imageFilterMultDivby2(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterMultDivby4: D = saturation255(S1/2 * S2/2)
int SDL_imageFilterMultDivby4(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterBitAnd: D = S1 & S2
int SDL_imageFilterBitAnd(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterBitOr: D = S1 | S2
int SDL_imageFilterBitOr(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterDiv: D = S1 / S2   (non-MMX)
int SDL_imageFilterDiv(unsigned char *Src1, unsigned char *Src2,
unsigned char *Dest, int length);
SDL_imageFilterBitNegation: D = !S
int SDL_imageFilterBitNegation(unsigned char *Src1, unsigned char *Dest,
int length);
SDL_imageFilterAddByte: D = saturation255(S + C)
int SDL_imageFilterAddByte(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char C);
SDL_imageFilterAddByteToHalf: D = saturation255(S/2 + C)
int SDL_imageFilterAddByteToHalf(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char C);
SDL_imageFilterSubByte: D = saturation0(S - C)
int SDL_imageFilterSubByte(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char C);
SDL_imageFilterShiftRight: D = saturation0(S >> N)
int SDL_imageFilterShiftRight(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char N);
SDL_imageFilterMultByByte: D = saturation255(S * C)
int SDL_imageFilterMultByByte(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char C);
SDL_imageFilterShiftRightAndMultByByte: D = saturation255((S >> N) * C)
int SDL_imageFilterShiftRightAndMultByByte(unsigned char *Src1,
unsigned char *Dest, int length, unsigned char N, unsigned char C);
SDL_imageFilterShiftLeftByte: D = (S << N)
int SDL_imageFilterShiftLeftByte(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char N);
SDL_imageFilterShiftLeft: D = saturation255(S << N)
int SDL_imageFilterShiftLeft(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char N);
SDL_imageFilterBinarizeUsingThreshold: D = S >= T ? 255:0
int SDL_imageFilterBinarizeUsingThreshold(unsigned char *Src1,
unsigned char *Dest, int length, unsigned char T);
SDL_imageFilterClipToRange: D = (S >= Tmin) & (S <= Tmax) 255:0
int SDL_imageFilterClipToRange(unsigned char *Src1, unsigned char *Dest,
int length, unsigned char Tmin, unsigned char Tmax);
SDL_imageFilterNormalizeLinear: D = saturation255((Nmax - Nmin)/
(Cmax - Cmin)*(S - Cmin) + Nmin)
int SDL_imageFilterNormalizeLinear(unsigned char *Src1, unsigned char *Dest,
int length, int Cmin, int Cmax, int Nmin, int Nmax);
!!! NO C-ROUTINE FOR THESE FUNCTIONS YET !!! 
SDL_imageFilterConvolveKernel3x3Divide: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel3x3Divide(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char Divisor);
SDL_imageFilterConvolveKernel5x5Divide: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel5x5Divide(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char Divisor);
SDL_imageFilterConvolveKernel7x7Divide: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel7x7Divide(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char Divisor);
SDL_imageFilterConvolveKernel9x9Divide: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel9x9Divide(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char Divisor);
SDL_imageFilterConvolveKernel3x3ShiftRight: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel3x3ShiftRight(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char NRightShift);
SDL_imageFilterConvolveKernel5x5ShiftRight: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel5x5ShiftRight(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char NRightShift);
SDL_imageFilterConvolveKernel7x7ShiftRight: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel7x7ShiftRight(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char NRightShift);
SDL_imageFilterConvolveKernel9x9ShiftRight: Dij = saturation0and255( ... )
int SDL_imageFilterConvolveKernel9x9ShiftRight(unsigned char *Src,
unsigned char *Dest, int rows, int columns,
signed short *Kernel, unsigned char NRightShift);
SDL_imageFilterSobelX: Dij = saturation255( ... )
int SDL_imageFilterSobelX(unsigned char *Src, unsigned char *Dest,
int rows, int columns);
SDL_imageFilterSobelXShiftRight: Dij = saturation255( ... )
int SDL_imageFilterSobelXShiftRight(unsigned char *Src,
unsigned char *Dest, int rows, int columns, 
unsigned char NRightShift);
Align/restore stack to 32 byte boundary -- Functionality untested! --
void SDL_imageFilterAlignStack(void);
void SDL_imageFilterRestoreStack(void);

To compile the library your need the SDL 1.2 installed from source or with the 'devel' RPM package.

Run

	./autogen.sh
./configure
make

to compile the library. Run the shell script 'nodebug.sh' before make, to patch the makefile for optimized compilation.

Run

	make install
ldconfig

to install the library. The default location for the installation is /usr/local/lib and /usr/local/include (for Linux).

To create a Windows DLL using VisualC:

        vcvars.bat
copy VisualC/makefile
nmake

To create a Windows DLL using the xmingw32 cross-compiler:

	cross-configure
cross-make
cross-make install

Change to the ./Test directory and run

	./configure
make

to create several test programs for the libraries functions.

To build without MMX code enabled (i.e. PPC architecture):

        ./configure --disable-mmx
make
make install

Also use this for AMD64 architecture (no pusha/popa).

To build on MacOS X with Project Builder, follow these steps:

Update your developer tools to the lastest version (December 2002 as of this revision).

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. 

Ver 2.0.17 - Sun Jun  1 15:39:38 EDT 2008
* hline/vline clipping and swap-logic fixed
* clipping box dimension check added and clipping-checks optimized
* TestFonts program updated
* Updated documentation on cross-compilation, AMD64
* Fixed circleColor overdraw
* Added arcColor routine
* Added polygonColorMT and polygonTextureMT routines
* Updated 32bit alpha blending routine 

Ver 2.0.16 - Mon Feb  5 19:03:31 AST 2007
* updated config.sub to newer version 
* added custom RGBA blitter function that sets/maintains target alpha
* added setAlpha function that sets alpha values in 32bit surfaces
* added TextGfxBlit testprogram for new functions
* Fixed C++ type in .h files (thanks Olivier)
* Update some text in README and .spec file
* Removed broken Uint filter routines from test program
* "Cosmetic" changes to test programs and Automake.am 

 Ver 2.0.15 - Fri Dec 22 08:44:31 AST 2006
* bugfixes in 32bit _putPixelAlpha/filledRectAlpha (thanks CISC)
* various bugfixes in return value generation and return (thanks CISC)
* lock font-surface before using it (thanks CISC)
* fix some breakage in non-MMX filter routines (thanks CISC)
* fix typo in TestABGR (thanks CISC)
* fix double buffer flipping in Tets programs (thanks CISC)
* fixed microversion in .h
* fixed texturePolygon inverted bug
* fixed wrong surface use in test 21 of TestRotozoom

Ver 2.0.14 - Tue Dec 19 08:49:02 AST 2006
* added texturedPolygon routine to library (thanks Jees)
* changed iterator condition in aaellipse to add some overdraw to smooth circle
* added ShrinkImage routine to rotozoom code
* added TestABGR Test program (bug in SDL_gfx or SDL??)
* improved TestImageFilter program (bug in Uint filters)
* changed .so versioning from .so.13.0.0 to .so.0.0.14
(best is to remove all old libs before installing)
* added updated MacOSX ProjectBuilder file (thanks Brian)
* added info on MacOSX 10.3 build
* added mingw (on cygwin) makefile (thanks Brian)
* added Dev-Cpp makefile (thanks Sebastian)
* removed some unused variables from gfx and rotozoom code (thanks Thi)
* fixed a non-critical typecast mistake (thanks Thi)
* converted all C++ comments to C comments in SDL_imageFilter 

Ver 2.0.13 - Tue Dec 21 08:41:25 EST 2004
* changed include back to "SDL.h"
* compile fixes for OSX fink  (thanks (Michael)
* compile fixes for gcc3.4 (thanks Dries)
* support vertical and horizontal flipping of axis in new 
rotozoomSurfaceXY function (thanks Victor)
* updated TestRotozoom program 
Ver 2.0.12 - Mon Aug 30 09:04:11 EDT 2004
* piecolor naming fix
* primitive API change to 'filledPie'
* introduction of some const variables
Ver 2.0.11 - Thu May 13 09:42:34 EDT 2004
* added pieRGBA/pieColor primitive (non filled pie)
* added QNX6 build patch
* use $(includedir)/SDL to automake setup
* updated README
* added 2x2 box & pie tests
* added dynamic font setup routine
* added sample font files to the Fonts directory
* added font test program
* string routines changed to use const char
* fixed TestRotozoom clear color bug
Ver 2.0.10 - Thu Dec 11 09:40:08 EST 2003
* updated "missing" script to newer version to avoid build errors
* fixed filled polygon int32 overflow error in calculation
* updated RPM spec file for new website path
* added micro version number to .h file
Ver 2.0.9 - Mon Oct 27 10:03:18 EST 2003
* Fixed "filled-box width too small by 1 bug" for A=255
* Wrong versioning in .h file
Ver 2.0.8 - Wed Jul 16 16:18:13 EDT 2003
* Modified filledPolygon drawing
(The edges of a filled polygon and a polyline were 
reported to not intersect correctly. With this fix, the
edges do still do not intersect 100% due to the difference
in the algorithms. But now a polygon will never draw 
outside of the area enclosed by a polyline.)
Ver 2.0.7 - Sun Jun  8 08:17:38 EDT 2003
* Added MacOS X Project Builder code
* changed SDL include to 
* added bezier curve 
Ver 2.0.6 - Sat May 25 15:12:17 EDT 2002
* Fixed clipping code for most primitives
* Added clipping code for character
* Added VC7 project file
Ver 2.0.5 - n/a
* Removed some unused code
Ver 2.0.4 - Sat Feb  9 22:09:45 EST 2002
* Fixed rectangle drawing bug on edges for A<255
* Added trigons (triangles) as wrapper calls to polygon.
Ver 2.0.3 - Sat Jan 26 10:06:16 EST 2002
* Zipped VisualC directory to avoid EOL problems.
* Fixed aalineColor call (y2 parameter was y1).
* Fixed rotozoom bug that caused black or undefined pixels on edges.
Ver 2.0.2 - Sat Jan 19 21:41:28 EST 2002
* Removed dependency from GL libraries during compile.
* Added VisualC makefile.
Ver 2.0 - Sat Dec 29 16:27:57 EST 2001
* Initial release of SDL_gfx based on SDL_gfxPrimitives and SDL_rotozoom
code.
* Added framerate code and testprogram.
* Added imageFilters code and testprogram.
* New distribution: source code, README, configure system etc.
Previous versions
=================
SDL_gfxPrimitives:
------------------
Ver 1.5 - Mon Jul  2 11:27:40 EDT 2001
* New alpha blending code for factor 4 speedups if a<255 on all functions.
* Modified include file for W32 DLL support.
* Added VC6 project files for DLL and static library building.
* Added simple AA-circle/-ellipse routine - quality needs improvement.
* Removed 32bit shift on 64bit number from aaline for better portability
across platforms.
* Removed a couple more compiler warnings (i.e. purely cosmetic fix).
Ver 1.4 - Sun Jun  3 11:52:07 EDT 2001
* Fixed hline, vline and rectangle clipping and result codes.
* Fixed AA-line arithmetic (was alpha subtraction, should be alpha ratio).
* More caching on fonts for speedups.
* More pointer checks in several places.
* New special cases for ellipses for rx=0/ry=0.
* Same sanity checks for circles/ellipses.
* Same return code for polygon/filledpolygon.
Ver 1.3 - Thu May 31 12:41:35 EDT 2001
* Minor cleanups and fixes (gcc -Wall is your friend).
Ver 1.2 again - Thu Apr  5 07:50:57 EDT 2001
* Fixed lineRGBA and aalineRGBA calls (had coordinate-passing mixed up twice,
thanks Lion for pointing this out)
Ver 1.2 - Wed Apr  4 08:32:42 EDT 2001
* Changed to a dual, you-have-the-choice(TM) licencing system 
to accomodate GPL developments using SDL_gfxPrimitives.
* Some minor fixes (thanks Karl).
* All routines return proper result code now.
* Clipping for aaline, circle and ellipse.
Ver 1.1 - Thu Mar 22 15:28:27 EST 2001
* Added code for Alpha=255 pixel drawing through direct memory writes to all routines
resulting in a much faster performance (factor 5 to 20) for non transparent pixels.
* New test and benchmark program with better info and nicer look.
* More info in README. Proper licence file. Comment cleanup.
Ver 1.0 - Fri Mar 16 08:38:07 EST 2001
* Initial release
SDL_rotozoom:
-------------
Ver 1.6 - Mon Nov 19 21:19:26 EST 2001
* Added interpolation to alpha channel (simplifies code)
* Ran the sourcecode through 'indent' for better readability
Ver 1.5 - Sat Jul  7 13:02:07 EDT 2001
* Added project files (VisualC.zip) and modifications for VC project building.
* Fixed old versioning in configure.in file.
* Fixed LICENSE file and LGPL source reference.
Ver 1.4 - Mon Jun  4 12:15:31 EDT 2001
* Removed SDL_SoftStretch call again in favour of an internal zoom routine.
* Added new zoomSurface() function with seperate X and Y zoom factors.
Ver 1.3 - Thu May 31 08:37:36 EDT 2001
* Modified code to handle RGBA or ABGR source surfaces transparently.
* More error checking, source surface locking.
* Slighly expanded test program with event handling.
Ver 1.2 - Wed May 30 18:18:05 EDT 2001
* Fixed the completely broken 32bit routine's pointer arithmetic.
* Uses SDL_SoftStretch in certain cases (angle=0, smooth=0).
* Convert source surface on the fly if not 8/32bit.
* Added license file - was empty before (duh).
Ver 1.1 - Wed May 23 15:04:42 EDT 2001
* Added automake/autoconf scripts and testprogram.
Ver 1.0 - Fri Mar 16 08:16:06 EST 2001
* Initial release

 

This library is used in the AppWares Development Group's IMP product and thanks goes out out to them for supporting this project.

 

* 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.

* AA-circle/-ellipse code idea from Stephane Magnenat, nct at wg0.ysagoon.com - thanks Stephane.

* Faster blending routines contributed by Anders Lindström, cal at swipnet.se - 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.