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se me habia olvidao añadir esto :P

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SDL_gfx - SDL graphics drawing primitives and other support functions
=============================================================================
Email aschiffler@appwares.ca 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.
Intro
-----
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_gfxPrimitves.h)
- Rotozoomer (SDL_rotozoom.h)
- Framerate control (SDL_framerate.h)
- MMX image filters (SDL_imageFilter.h)
See ./Docs directory for a longer HTML version of this document.
Supported Platforms
-------------------
The library compiles and is tested for a Linux target (gcc compiler) and
a Win32 target (VisualC6/7, xmingw32 cross-compiler). MacOS X target is
reported to work (Project Builder).
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.
Other platforms might work but have not been tested by the author.
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.
Currently, The following Anti-Aliased drawing primitives are available:
- AA-line
- AA-polygon
- AA-circle
- AA-ellipse
[[[ Interface ]]]
See SDL_gfxPrimitives.h for all the drawing functions.
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 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 * 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
Notes on framerate functions
----------------------------
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
SDL_Delay(1000/FPS);
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.
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).
[[[ Interface ]]]
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.
Notes on imageFilter functions
------------------------------
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 ]]]
See the extensive list of routines in SDL_imageFilters.h for info.
Installation and Test
---------------------
To compile the library your need the SDL 1.2 installed from source or
with the 'devel' RPM package.
Run
./autogen.sh (optional)
./configure
make
make install
ldconfig
to compile and install the library. The default location for the
installation is /usr/local/lib and /usr/local/include.
Run the shell script 'nodebug.sh' before make, to patch the makefile
for optimized compilation:
./autogen.sh (optional)
./configure
./nodebug.sh
make
make install
ldconfig
To create a Windows DLL using VisualC:
unzip -a VisualC6.zip
vcvars32.bat
copy VisualC/makefile
nmake
or
unzip -a VisualC7.zip
and open the project file.
To create a Windows DLL using the xmingw32 cross-compiler:
cross-configure
cross-make
cross-make install
To build without MMX code enabled (i.e. PPC architecture):
./configure --disable-mmx
make
make install
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.
Test Programs
-------------
Change to the ./Test directory and run
./configure
make
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 sample code.
Thanks
------
Thanks to 'AppWares Development Group' for supporting this project - please
visit http://www.appwares.com for more information.
Contributors
------------
* Non-alpha line drawing code adapted from routine
by Pete Shinners, pete@shinners.org - thanks Pete.
* More fixes by Karl Bartel, karlb@gmx.net - thanks Karl.
* Much testing and suggestions for fixes from Danny van Bruggen,
danny@froukepc.dhs.org - thanks Danny.
* Original AA-circle/-ellipse code idea from Stephane Magnenat,
nct@wg0.ysagoon.com - thanks Stephane.
* Faster blending routines contributed by Anders Lindström,
cal@swipnet.se - thanks Anders.
* New AA-circle/-ellipse code based on ideas from Anders Lindström -
thanks Anders.
* VisualC makefile contributed by Danny van Bruggen,
danny@froukepc.dhs.org - thanks Danny.
* VisualC7 project file contributed by James Turk,
jturk@conceptofzero.com - thanks James.
* Project Builder package contributed by Thomas Tongue,
TTongue@imagiware.com - Thanks Thomas.

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/*
SDL_framerate: framerate manager
LGPL (c) A. Schiffler
*/
#include "SDL_framerate.h"
/*
Initialize the framerate manager
*/
void SDL_initFramerate(FPSmanager * manager)
{
/*
* Store some sane values
*/
manager->framecount = 0;
manager->rate = FPS_DEFAULT;
manager->rateticks = (1000.0 / (float) FPS_DEFAULT);
manager->lastticks = SDL_GetTicks();
}
/*
Set the framerate in Hz
*/
int SDL_setFramerate(FPSmanager * manager, int rate)
{
if ((rate >= FPS_LOWER_LIMIT) && (rate <= FPS_UPPER_LIMIT)) {
manager->framecount = 0;
manager->rate = rate;
manager->rateticks = (1000.0 / (float) rate);
return (0);
} else {
return (-1);
}
}
/*
Return the current target framerate in Hz
*/
int SDL_getFramerate(FPSmanager * manager)
{
if (manager == NULL) {
return (-1);
} else {
return (manager->rate);
}
}
/*
Delay execution to maintain a constant framerate. Calculate fps.
*/
void SDL_framerateDelay(FPSmanager * manager)
{
Uint32 current_ticks;
Uint32 target_ticks;
Uint32 the_delay;
/*
* Next frame
*/
manager->framecount++;
/*
* Get/calc ticks
*/
current_ticks = SDL_GetTicks();
target_ticks = manager->lastticks + (Uint32) ((float) manager->framecount * manager->rateticks);
if (current_ticks <= target_ticks) {
the_delay = target_ticks - current_ticks;
SDL_Delay(the_delay);
} else {
manager->framecount = 0;
manager->lastticks = SDL_GetTicks();
}
}

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/*
SDL_framerate: framerate manager
LGPL (c) A. Schiffler
*/
#ifndef _SDL_framerate_h
#define _SDL_framerate_h
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
/* --- */
#include <SDL.h>
/* --------- Definitions */
/* Some rates in Hz */
#define FPS_UPPER_LIMIT 200
#define FPS_LOWER_LIMIT 1
#define FPS_DEFAULT 30
/* --------- Structure variables */
typedef struct {
Uint32 framecount;
float rateticks;
Uint32 lastticks;
Uint32 rate;
} FPSmanager;
/* --------- Function prototypes */
#ifdef WIN32
#ifdef BUILD_DLL
#define DLLINTERFACE __declspec(dllexport)
#else
#define DLLINTERFACE __declspec(dllimport)
#endif
#else
#define DLLINTERFACE
#endif
/* Functions return 0 or value for sucess and -1 for error */
DLLINTERFACE void SDL_initFramerate(FPSmanager * manager);
DLLINTERFACE int SDL_setFramerate(FPSmanager * manager, int rate);
DLLINTERFACE int SDL_getFramerate(FPSmanager * manager);
DLLINTERFACE void SDL_framerateDelay(FPSmanager * manager);
/* --- */
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
};
#endif
#endif /* _SDL_framerate_h */

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/*
SDL_gfxPrimitives: graphics primitives for SDL
LGPL (c) A. Schiffler
*/
#ifndef _SDL_gfxPrimitives_h
#define _SDL_gfxPrimitives_h
#include <math.h>
#ifndef M_PI
#define M_PI 3.141592654
#endif
#include <SDL.h>
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
/* ----- Versioning */
#define SDL_GFXPRIMITIVES_MAJOR 1
#define SDL_GFXPRIMITIVES_MINOR 5
/* ----- W32 DLL interface */
#ifdef WIN32
#ifdef BUILD_DLL
#define DLLINTERFACE __declspec(dllexport)
#else
#define DLLINTERFACE __declspec(dllimport)
#endif
#else
#define DLLINTERFACE
#endif
/* ----- Prototypes */
/* Note: all ___Color routines expect the color to be in format 0xRRGGBBAA */
/* Pixel */
DLLINTERFACE int pixelColor(SDL_Surface * dst, Sint16 x, Sint16 y, Uint32 color);
DLLINTERFACE int pixelRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Horizontal line */
DLLINTERFACE int hlineColor(SDL_Surface * dst, Sint16 x1, Sint16 x2, Sint16 y, Uint32 color);
DLLINTERFACE int hlineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 x2, Sint16 y, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Vertical line */
DLLINTERFACE int vlineColor(SDL_Surface * dst, Sint16 x, Sint16 y1, Sint16 y2, Uint32 color);
DLLINTERFACE int vlineRGBA(SDL_Surface * dst, Sint16 x, Sint16 y1, Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Rectangle */
DLLINTERFACE int rectangleColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color);
DLLINTERFACE int rectangleRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Filled rectangle (Box) */
DLLINTERFACE int boxColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color);
DLLINTERFACE int boxRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2,
Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Line */
DLLINTERFACE int lineColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color);
DLLINTERFACE int lineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* AA Line */
DLLINTERFACE int aalineColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Uint32 color);
DLLINTERFACE int aalineRGBA(SDL_Surface * dst, Sint16 x1, Sint16 y1,
Sint16 x2, Sint16 y2, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Circle */
DLLINTERFACE int circleColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 r, Uint32 color);
DLLINTERFACE int circleRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rad, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* AA Circle */
DLLINTERFACE int aacircleColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 r, Uint32 color);
DLLINTERFACE int aacircleRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rad, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Filled Circle */
DLLINTERFACE int filledCircleColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 r, Uint32 color);
DLLINTERFACE int filledCircleRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rad, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Ellipse */
DLLINTERFACE int ellipseColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rx, Sint16 ry, Uint32 color);
DLLINTERFACE int ellipseRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* AA Ellipse */
DLLINTERFACE int aaellipseColor(SDL_Surface * dst, Sint16 xc, Sint16 yc, Sint16 rx, Sint16 ry, Uint32 color);
DLLINTERFACE int aaellipseRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Filled Ellipse */
DLLINTERFACE int filledEllipseColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rx, Sint16 ry, Uint32 color);
DLLINTERFACE int filledEllipseRGBA(SDL_Surface * dst, Sint16 x, Sint16 y,
Sint16 rx, Sint16 ry, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Filled Pie */
DLLINTERFACE int filledpieColor(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rad,
Sint16 start, Sint16 end, Uint32 color);
DLLINTERFACE int filledpieRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, Sint16 rad,
Sint16 start, Sint16 end, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Trigon */
DLLINTERFACE int trigonColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Sint16 x3, Sint16 y3, Uint32 color);
DLLINTERFACE 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 */
DLLINTERFACE int aatrigonColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Sint16 x3, Sint16 y3, Uint32 color);
DLLINTERFACE 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 */
DLLINTERFACE int filledTrigonColor(SDL_Surface * dst, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2, Sint16 x3, Sint16 y3, int color);
DLLINTERFACE 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 */
DLLINTERFACE int polygonColor(SDL_Surface * dst, Sint16 * vx, Sint16 * vy, int n, Uint32 color);
DLLINTERFACE int polygonRGBA(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* AA-Polygon */
DLLINTERFACE int aapolygonColor(SDL_Surface * dst, Sint16 * vx, Sint16 * vy, int n, Uint32 color);
DLLINTERFACE int aapolygonRGBA(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Filled Polygon */
DLLINTERFACE int filledPolygonColor(SDL_Surface * dst, Sint16 * vx, Sint16 * vy, int n, int color);
DLLINTERFACE int filledPolygonRGBA(SDL_Surface * dst, Sint16 * vx,
Sint16 * vy, int n, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Bezier */
/* s = number of steps */
DLLINTERFACE int bezierColor(SDL_Surface * dst, Sint16 * vx, Sint16 * vy, int n, int s, Uint32 color);
DLLINTERFACE int bezierRGBA(SDL_Surface * dst, Sint16 * vx, Sint16 * vy,
int n, int s, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* 8x8 Characters/Strings */
DLLINTERFACE int characterColor(SDL_Surface * dst, Sint16 x, Sint16 y, char c, Uint32 color);
DLLINTERFACE int characterRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, char c, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
DLLINTERFACE int stringColor(SDL_Surface * dst, Sint16 x, Sint16 y, char *c, Uint32 color);
DLLINTERFACE int stringRGBA(SDL_Surface * dst, Sint16 x, Sint16 y, char *c, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
};
#endif
#endif /* _SDL_gfxPrimitives_h */

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/*
SDL_rotozoom.c - rotozoomer for 32bit or 8bit surfaces
LGPL (c) A. Schiffler
*/
#ifdef WIN32
#include <windows.h>
#endif
#include <stdlib.h>
#include <string.h>
#include "SDL_rotozoom.h"
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
/*
32bit Zoomer with optional anti-aliasing by bilinear interpolation.
Zoomes 32bit RGBA/ABGR 'src' surface to 'dst' surface.
*/
int zoomSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int smooth)
{
int x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep;
tColorRGBA *c00, *c01, *c10, *c11;
tColorRGBA *sp, *csp, *dp;
int sgap, dgap;
/*
* Variable setup
*/
if (smooth) {
/*
* For interpolation: assume source dimension is one pixel
*/
/*
* smaller to avoid overflow on right and bottom edge.
*/
sx = (int) (65536.0 * (float) (src->w - 1) / (float) dst->w);
sy = (int) (65536.0 * (float) (src->h - 1) / (float) dst->h);
} else {
sx = (int) (65536.0 * (float) src->w / (float) dst->w);
sy = (int) (65536.0 * (float) src->h / (float) dst->h);
}
/*
* Allocate memory for row increments
*/
if ((sax = (int *) malloc((dst->w + 1) * sizeof(Uint32))) == NULL) {
return (-1);
}
if ((say = (int *) malloc((dst->h + 1) * sizeof(Uint32))) == NULL) {
free(sax);
return (-1);
}
/*
* Precalculate row increments
*/
csx = 0;
csax = sax;
for (x = 0; x <= dst->w; x++) {
*csax = csx;
csax++;
csx &= 0xffff;
csx += sx;
}
csy = 0;
csay = say;
for (y = 0; y <= dst->h; y++) {
*csay = csy;
csay++;
csy &= 0xffff;
csy += sy;
}
/*
* Pointer setup
*/
sp = csp = (tColorRGBA *) src->pixels;
dp = (tColorRGBA *) dst->pixels;
sgap = src->pitch - src->w * 4;
dgap = dst->pitch - dst->w * 4;
/*
* Switch between interpolating and non-interpolating code
*/
if (smooth) {
/*
* Interpolating Zoom
*/
/*
* Scan destination
*/
csay = say;
for (y = 0; y < dst->h; y++) {
/*
* Setup color source pointers
*/
c00 = csp;
c01 = csp;
c01++;
c10 = (tColorRGBA *) ((Uint8 *) csp + src->pitch);
c11 = c10;
c11++;
csax = sax;
for (x = 0; x < dst->w; x++) {
/*
* Interpolate colors
*/
ex = (*csax & 0xffff);
ey = (*csay & 0xffff);
t1 = ((((c01->r - c00->r) * ex) >> 16) + c00->r) & 0xff;
t2 = ((((c11->r - c10->r) * ex) >> 16) + c10->r) & 0xff;
dp->r = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01->g - c00->g) * ex) >> 16) + c00->g) & 0xff;
t2 = ((((c11->g - c10->g) * ex) >> 16) + c10->g) & 0xff;
dp->g = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01->b - c00->b) * ex) >> 16) + c00->b) & 0xff;
t2 = ((((c11->b - c10->b) * ex) >> 16) + c10->b) & 0xff;
dp->b = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01->a - c00->a) * ex) >> 16) + c00->a) & 0xff;
t2 = ((((c11->a - c10->a) * ex) >> 16) + c10->a) & 0xff;
dp->a = (((t2 - t1) * ey) >> 16) + t1;
/*
* Advance source pointers
*/
csax++;
sstep = (*csax >> 16);
c00 += sstep;
c01 += sstep;
c10 += sstep;
c11 += sstep;
/*
* Advance destination pointer
*/
dp++;
}
/*
* Advance source pointer
*/
csay++;
csp = (tColorRGBA *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
/*
* Advance destination pointers
*/
dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
}
} else {
/*
* Non-Interpolating Zoom
*/
csay = say;
for (y = 0; y < dst->h; y++) {
sp = csp;
csax = sax;
for (x = 0; x < dst->w; x++) {
/*
* Draw
*/
*dp = *sp;
/*
* Advance source pointers
*/
csax++;
sp += (*csax >> 16);
/*
* Advance destination pointer
*/
dp++;
}
/*
* Advance source pointer
*/
csay++;
csp = (tColorRGBA *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
/*
* Advance destination pointers
*/
dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
}
}
/*
* Remove temp arrays
*/
free(sax);
free(say);
return (0);
}
/*
8bit Zoomer without smoothing.
Zoomes 8bit palette/Y 'src' surface to 'dst' surface.
*/
int zoomSurfaceY(SDL_Surface * src, SDL_Surface * dst)
{
Uint32 x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy;
Uint8 *sp, *dp, *csp;
int dgap;
/*
* Variable setup
*/
sx = (Uint32) (65536.0 * (float) src->w / (float) dst->w);
sy = (Uint32) (65536.0 * (float) src->h / (float) dst->h);
/*
* Allocate memory for row increments
*/
if ((sax = (Uint32 *) malloc(dst->w * sizeof(Uint32))) == NULL) {
return (-1);
}
if ((say = (Uint32 *) malloc(dst->h * sizeof(Uint32))) == NULL) {
if (sax != NULL) {
free(sax);
}
return (-1);
}
/*
* Precalculate row increments
*/
csx = 0;
csax = sax;
for (x = 0; x < dst->w; x++) {
csx += sx;
*csax = (csx >> 16);
csx &= 0xffff;
csax++;
}
csy = 0;
csay = say;
for (y = 0; y < dst->h; y++) {
csy += sy;
*csay = (csy >> 16);
csy &= 0xffff;
csay++;
}
csx = 0;
csax = sax;
for (x = 0; x < dst->w; x++) {
csx += (*csax);
csax++;
}
csy = 0;
csay = say;
for (y = 0; y < dst->h; y++) {
csy += (*csay);
csay++;
}
/*
* Pointer setup
*/
sp = csp = (Uint8 *) src->pixels;
dp = (Uint8 *) dst->pixels;
dgap = dst->pitch - dst->w;
/*
* Draw
*/
csay = say;
for (y = 0; y < dst->h; y++) {
csax = sax;
sp = csp;
for (x = 0; x < dst->w; x++) {
/*
* Draw
*/
*dp = *sp;
/*
* Advance source pointers
*/
sp += (*csax);
csax++;
/*
* Advance destination pointer
*/
dp++;
}
/*
* Advance source pointer (for row)
*/
csp += ((*csay) * src->pitch);
csay++;
/*
* Advance destination pointers
*/
dp += dgap;
}
/*
* Remove temp arrays
*/
free(sax);
free(say);
return (0);
}
/*
32bit Rotozoomer with optional anti-aliasing by bilinear interpolation.
Rotates and zoomes 32bit RGBA/ABGR 'src' surface to 'dst' surface.
*/
void transformSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos, int smooth)
{
int x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
tColorRGBA c00, c01, c10, c11;
tColorRGBA *pc, *sp; // *spb;
int gap;
/*
* Variable setup
*/
xd = ((src->w - dst->w) << 15);
yd = ((src->h - dst->h) << 15);
ax = (cx << 16) - (icos * cx);
ay = (cy << 16) - (isin * cx);
sw = src->w - 1;
sh = src->h - 1;
pc = dst->pixels;
gap = dst->pitch - dst->w * 4;
/*
* Switch between interpolating and non-interpolating code
*/
if (smooth) {
for (y = 0; y < dst->h; y++) {
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++) {
dx = (sdx >> 16);
dy = (sdy >> 16);
if ((dx >= -1) && (dy >= -1) && (dx < src->w) && (dy < src->h)) {
if ((dx >= 0) && (dy >= 0) && (dx < sw) && (dy < sh)) {
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
sp += dx;
c00 = *sp;
sp += 1;
c01 = *sp;
sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
sp -= 1;
c10 = *sp;
sp += 1;
c11 = *sp;
} else if ((dx == sw) && (dy == sh)) {
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
sp += dx;
c00 = *sp;
c01 = *sp;
c10 = *sp;
c11 = *sp;
} else if ((dx == -1) && (dy == -1)) {
sp = (tColorRGBA *) (src->pixels);
c00 = *sp;
c01 = *sp;
c10 = *sp;
c11 = *sp;
} else if ((dx == -1) && (dy == sh)) {
sp = (tColorRGBA *) (src->pixels);
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
c00 = *sp;
c01 = *sp;
c10 = *sp;
c11 = *sp;
} else if ((dx == sw) && (dy == -1)) {
sp = (tColorRGBA *) (src->pixels);
sp += dx;
c00 = *sp;
c01 = *sp;
c10 = *sp;
c11 = *sp;
} else if (dx == -1) {
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
c00 = *sp;
c01 = *sp;
c10 = *sp;
sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
c11 = *sp;
} else if (dy == -1) {
sp = (tColorRGBA *) (src->pixels);
sp += dx;
c00 = *sp;
c01 = *sp;
c10 = *sp;
sp += 1;
c11 = *sp;
} else if (dx == sw) {
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
sp += dx;
c00 = *sp;
c01 = *sp;
sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
c10 = *sp;
c11 = *sp;
} else if (dy == sh) {
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
sp += dx;
c00 = *sp;
sp += 1;
c01 = *sp;
c10 = *sp;
c11 = *sp;
}
/*
* Interpolate colors
*/
ex = (sdx & 0xffff);
ey = (sdy & 0xffff);
t1 = ((((c01.r - c00.r) * ex) >> 16) + c00.r) & 0xff;
t2 = ((((c11.r - c10.r) * ex) >> 16) + c10.r) & 0xff;
pc->r = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.g - c00.g) * ex) >> 16) + c00.g) & 0xff;
t2 = ((((c11.g - c10.g) * ex) >> 16) + c10.g) & 0xff;
pc->g = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.b - c00.b) * ex) >> 16) + c00.b) & 0xff;
t2 = ((((c11.b - c10.b) * ex) >> 16) + c10.b) & 0xff;
pc->b = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.a - c00.a) * ex) >> 16) + c00.a) & 0xff;
t2 = ((((c11.a - c10.a) * ex) >> 16) + c10.a) & 0xff;
pc->a = (((t2 - t1) * ey) >> 16) + t1;
}
sdx += icos;
sdy += isin;
pc++;
}
pc = (tColorRGBA *) ((Uint8 *) pc + gap);
}
} else {
for (y = 0; y < dst->h; y++) {
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++) {
dx = (short) (sdx >> 16);
dy = (short) (sdy >> 16);
if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
sp += dx;
*pc = *sp;
}
sdx += icos;
sdy += isin;
pc++;
}
pc = (tColorRGBA *) ((Uint8 *) pc + gap);
}
}
}
/*
8bit Rotozoomer without smoothing
Rotates and zoomes 8bit palette/Y 'src' surface to 'dst' surface.
*/
void transformSurfaceY(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos)
{
int x, y, dx, dy, xd, yd, sdx, sdy, ax, ay, sw, sh;
tColorY *pc, *sp;
int gap;
/*
* Variable setup
*/
xd = ((src->w - dst->w) << 15);
yd = ((src->h - dst->h) << 15);
ax = (cx << 16) - (icos * cx);
ay = (cy << 16) - (isin * cx);
sw = src->w - 1;
sh = src->h - 1;
pc = dst->pixels;
gap = dst->pitch - dst->w;
/*
* Clear surface to colorkey
*/
memset(pc, (unsigned char) (src->format->colorkey & 0xff), dst->pitch * dst->h);
/*
* Iterate through destination surface
*/
for (y = 0; y < dst->h; y++) {
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++) {
dx = (short) (sdx >> 16);
dy = (short) (sdy >> 16);
if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h)) {
sp = (tColorY *) (src->pixels);
sp += (src->pitch * dy + dx);
*pc = *sp;
}
sdx += icos;
sdy += isin;
pc++;
}
pc += gap;
}
}
/*
rotozoomSurface()
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.
*/
#define VALUE_LIMIT 0.001
/* Local rotozoom-size function with trig result return */
void rotozoomSurfaceSizeTrig(int width, int height, double angle, double zoom, int *dstwidth, int *dstheight,
double *canglezoom, double *sanglezoom)
{
double x, y, cx, cy, sx, sy;
double radangle;
int dstwidthhalf, dstheighthalf;
/*
* Determine destination width and height by rotating a centered source box
*/
radangle = angle * (M_PI / 180.0);
*sanglezoom = sin(radangle);
*canglezoom = cos(radangle);
*sanglezoom *= zoom;
*canglezoom *= zoom;
x = width / 2;
y = height / 2;
cx = *canglezoom * x;
cy = *canglezoom * y;
sx = *sanglezoom * x;
sy = *sanglezoom * y;
dstwidthhalf = MAX((int)
ceil(MAX(MAX(MAX(fabs(cx + sy), fabs(cx - sy)), fabs(-cx + sy)), fabs(-cx - sy))), 1);
dstheighthalf = MAX((int)
ceil(MAX(MAX(MAX(fabs(sx + cy), fabs(sx - cy)), fabs(-sx + cy)), fabs(-sx - cy))), 1);
*dstwidth = 2 * dstwidthhalf;
*dstheight = 2 * dstheighthalf;
}
/* Publically available rotozoom-size function */
void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth, int *dstheight)
{
double dummy_sanglezoom, dummy_canglezoom;
rotozoomSurfaceSizeTrig(width, height, angle, zoom, dstwidth, dstheight, &dummy_sanglezoom, &dummy_canglezoom);
}
/* Publically available rotozoom function */
SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth)
{
SDL_Surface *rz_src;
SDL_Surface *rz_dst;
double zoominv;
double sanglezoom, canglezoom, sanglezoominv, canglezoominv;
int dstwidthhalf, dstwidth, dstheighthalf, dstheight;
//double x, y, cx, cy, sx, sy;
int is32bit;
int i, src_converted;
/*
* Sanity check
*/
if (src == NULL)
return (NULL);
/*
* Determine if source surface is 32bit or 8bit
*/
is32bit = (src->format->BitsPerPixel == 32);
if ((is32bit) || (src->format->BitsPerPixel == 8)) {
/*
* Use source surface 'as is'
*/
rz_src = src;
src_converted = 0;
} else {
/*
* New source surface is 32bit with a defined RGBA ordering
*/
rz_src =
SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
SDL_BlitSurface(src, NULL, rz_src, NULL);
src_converted = 1;
is32bit = 1;
}
/*
* Sanity check zoom factor
*/
if (zoom < VALUE_LIMIT) {
zoom = VALUE_LIMIT;
}
zoominv = 65536.0 / (zoom * zoom);
/*
* Check if we have a rotozoom or just a zoom
*/
if (fabs(angle) > VALUE_LIMIT) {
/*
* Angle!=0: full rotozoom
*/
/*
* -----------------------
*/
/* Determine target size */
rotozoomSurfaceSizeTrig(rz_src->w, rz_src->h, angle, zoom, &dstwidth, &dstheight, &canglezoom, &sanglezoom);
/*
* Calculate target factors from sin/cos and zoom
*/
sanglezoominv = sanglezoom;
canglezoominv = canglezoom;
sanglezoominv *= zoominv;
canglezoominv *= zoominv;
/* Calculate half size */
dstwidthhalf = dstwidth / 2;
dstheighthalf = dstheight / 2;
/*
* Alloc space to completely contain the rotated surface
*/
rz_dst = NULL;
if (is32bit) {
/*
* Target surface is 32bit with source RGBA/ABGR ordering
*/
rz_dst =
SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32,
rz_src->format->Rmask, rz_src->format->Gmask,
rz_src->format->Bmask, rz_src->format->Amask);
} else {
/*
* Target surface is 8bit
*/
rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0);
}
/*
* Lock source surface
*/
SDL_LockSurface(rz_src);
/*
* Check which kind of surface we have
*/
if (is32bit) {
/*
* Call the 32bit transformation routine to do the rotation (using alpha)
*/
transformSurfaceRGBA(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
(int) (sanglezoominv), (int) (canglezoominv), smooth);
/*
* Turn on source-alpha support
*/
SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
} else {
/*
* Copy palette and colorkey info
*/
for (i = 0; i < rz_src->format->palette->ncolors; i++) {
rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
}
rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
/*
* Call the 8bit transformation routine to do the rotation
*/
transformSurfaceY(rz_src, rz_dst, dstwidthhalf, dstheighthalf,
(int) (sanglezoominv), (int) (canglezoominv));
SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey);
}
/*
* Unlock source surface
*/
SDL_UnlockSurface(rz_src);
} else {
/*
* Angle=0: Just a zoom
*/
/*
* --------------------
*/
/*
* Calculate target size
*/
zoomSurfaceSize(rz_src->w, rz_src->h, zoom, zoom, &dstwidth, &dstheight);
/*
* Alloc space to completely contain the zoomed surface
*/
rz_dst = NULL;
if (is32bit) {
/*
* Target surface is 32bit with source RGBA/ABGR ordering
*/
rz_dst =
SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32,
rz_src->format->Rmask, rz_src->format->Gmask,
rz_src->format->Bmask, rz_src->format->Amask);
} else {
/*
* Target surface is 8bit
*/
rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0);
}
/*
* Lock source surface
*/
SDL_LockSurface(rz_src);
/*
* Check which kind of surface we have
*/
if (is32bit) {
/*
* Call the 32bit transformation routine to do the zooming (using alpha)
*/
zoomSurfaceRGBA(rz_src, rz_dst, smooth);
/*
* Turn on source-alpha support
*/
SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
} else {
/*
* Copy palette and colorkey info
*/
for (i = 0; i < rz_src->format->palette->ncolors; i++) {
rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
}
rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
/*
* Call the 8bit transformation routine to do the zooming
*/
zoomSurfaceY(rz_src, rz_dst);
SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey);
}
/*
* Unlock source surface
*/
SDL_UnlockSurface(rz_src);
}
/*
* Cleanup temp surface
*/
if (src_converted) {
SDL_FreeSurface(rz_src);
}
/*
* Return destination surface
*/
return (rz_dst);
}
/*
zoomSurface()
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.
*/
#define VALUE_LIMIT 0.001
void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight)
{
/*
* Sanity check zoom factors
*/
if (zoomx < VALUE_LIMIT) {
zoomx = VALUE_LIMIT;
}
if (zoomy < VALUE_LIMIT) {
zoomy = VALUE_LIMIT;
}
/*
* Calculate target size
*/
*dstwidth = (int) ((double) width * zoomx);
*dstheight = (int) ((double) height * zoomy);
if (*dstwidth < 1) {
*dstwidth = 1;
}
if (*dstheight < 1) {
*dstheight = 1;
}
}
SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth)
{
SDL_Surface *rz_src;
SDL_Surface *rz_dst;
int dstwidth, dstheight;
int is32bit;
int i, src_converted;
/*
* Sanity check
*/
if (src == NULL)
return (NULL);
/*
* Determine if source surface is 32bit or 8bit
*/
is32bit = (src->format->BitsPerPixel == 32);
if ((is32bit) || (src->format->BitsPerPixel == 8)) {
/*
* Use source surface 'as is'
*/
rz_src = src;
src_converted = 0;
} else {
/*
* New source surface is 32bit with a defined RGBA ordering
*/
rz_src =
SDL_CreateRGBSurface(SDL_SWSURFACE, src->w, src->h, 32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
SDL_BlitSurface(src, NULL, rz_src, NULL);
src_converted = 1;
is32bit = 1;
}
/* Get size if target */
zoomSurfaceSize(rz_src->w, rz_src->h, zoomx, zoomy, &dstwidth, &dstheight);
/*
* Alloc space to completely contain the zoomed surface
*/
rz_dst = NULL;
if (is32bit) {
/*
* Target surface is 32bit with source RGBA/ABGR ordering
*/
rz_dst =
SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 32,
rz_src->format->Rmask, rz_src->format->Gmask,
rz_src->format->Bmask, rz_src->format->Amask);
} else {
/*
* Target surface is 8bit
*/
rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0, 0);
}
/*
* Lock source surface
*/
SDL_LockSurface(rz_src);
/*
* Check which kind of surface we have
*/
if (is32bit) {
/*
* Call the 32bit transformation routine to do the zooming (using alpha)
*/
zoomSurfaceRGBA(rz_src, rz_dst, smooth);
/*
* Turn on source-alpha support
*/
SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255);
} else {
/*
* Copy palette and colorkey info
*/
for (i = 0; i < rz_src->format->palette->ncolors; i++) {
rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
}
rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
/*
* Call the 8bit transformation routine to do the zooming
*/
zoomSurfaceY(rz_src, rz_dst);
SDL_SetColorKey(rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL, rz_src->format->colorkey);
}
/*
* Unlock source surface
*/
SDL_UnlockSurface(rz_src);
/*
* Cleanup temp surface
*/
if (src_converted) {
SDL_FreeSurface(rz_src);
}
/*
* Return destination surface
*/
return (rz_dst);
}

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/*
SDL_rotozoom - rotozoomer
LGPL (c) A. Schiffler
*/
#ifndef _SDL_rotozoom_h
#define _SDL_rotozoom_h
#include <math.h>
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C" {
#endif
#ifndef M_PI
#define M_PI 3.141592654
#endif
#include <SDL.h>
/* ---- Defines */
#define SMOOTHING_OFF 0
#define SMOOTHING_ON 1
/* ---- Structures */
typedef struct tColorRGBA {
Uint8 r;
Uint8 g;
Uint8 b;
Uint8 a;
} tColorRGBA;
typedef struct tColorY {
Uint8 y;
} tColorY;
/* ---- Prototypes */
#ifdef WIN32
#ifdef BUILD_DLL
#define DLLINTERFACE __declspec(dllexport)
#else
#define DLLINTERFACE __declspec(dllimport)
#endif
#else
#define DLLINTERFACE
#endif
/*
rotozoomSurface()
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.
*/
DLLINTERFACE SDL_Surface *rotozoomSurface(SDL_Surface * src, double angle, double zoom, int smooth);
/* Returns the size of the target surface for a rotozoomSurface() call */
DLLINTERFACE void rotozoomSurfaceSize(int width, int height, double angle, double zoom, int *dstwidth,
int *dstheight);
/*
zoomSurface()
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.
*/
DLLINTERFACE SDL_Surface *zoomSurface(SDL_Surface * src, double zoomx, double zoomy, int smooth);
/* Returns the size of the target surface for a zoomSurface() call */
DLLINTERFACE void zoomSurfaceSize(int width, int height, double zoomx, double zoomy, int *dstwidth, int *dstheight);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
};
#endif
#endif /* _SDL_rotozoom_h */

2889
util/cosas utiles/kplib/kplib.c Normal file
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31
util/cosas utiles/kplib/kplib.h Normal file
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/*
KPLIB.H: Ken's Picture LIBrary written by Ken Silverman
Copyright (c) 1998-2004 Ken Silverman
Ken Silverman's official web site: http://www.advsys.net/ken
*/
#ifndef __KPLIB_H__
#define __KPLIB_H__
//High-level (easy) picture loading function:
extern void kpzload (const char *, long *, long *, long *, long *);
//Low-level PNG/JPG functions:
extern void kpgetdim (const char *, long, long *, long *);
extern long kprender (const char *, long, long, long, long, long, long, long);
//ZIP functions:
extern void kzaddstack (const char *);
extern void kzuninit ();
extern long kzopen (const char *);
extern long kzread (void *, long);
extern long kzfilelength ();
extern void kzseek (long, long);
extern long kztell ();
extern long kzgetc ();
extern long kzeof ();
extern void kzclose ();
extern void kzfindfilestart (const char *); //pass wildcard string
extern long kzfindfile (char *); //you alloc buf, returns 1:found,0:~found
#endif //__KPLIB_H__

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Ésta es la librería KPLIB, escrita por Ken Silverman (el ke hizo el motor del Duke3D).
Lo he sacado de su librería Voxlap. El .h es un cacho sacado de voxlap5.h
Puede abrir BMP,JPG,PNG,GIF,PCX,TGA,CEL y ZIP (y puede ke algún otro formato). Funciona en Windows y Linux. Está muy bien porke además es pequeña y simple (normalmente necesitaríamos varias librerías para abrir tantos formatos). Además, puede cargar cualquiera de los mencionados formatos directamente desde un archivo ZIP, lo cual permite usarlos como sistema de ficheros virtual (PAK's). Y por cierto, Silverman hizo varias mejoras al formato PNG, por lo que ésta es una de las mejores librerías que hay para cargar PNG.
Creo que no infringimos ninguna licencia incluyendo esto en eDIV. en el .C no pone nada, pero quizás utilice la licencia BUILD, que básicamente dice que le demos crédito al autor y que no lo utilicemos con fines comerciales sin darle su parte X) no sé a vosotros, pero a mí a estas alturas me importan bastante poco las posibles (o mejor dicho, improbables) aplicaciones comerciales de eDIV.
+ info en la página de Silverman: http://www.advsys.net/ken
Er_Makina