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SDL_prim.h File Reference

#include "SDL.h"

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Defines

#define __SDL_PRIM_H   1

Functions

void SDL_putPixel (SDL_Surface *, int, int, Uint32)
void SDL_blendPixel (SDL_Surface *, int, int, Uint32, Uint8)
Uint8 * SDL_getPixel (SDL_Surface *, int, int)
void __slow_SDL_blendPixel (SDL_Surface *, int, int, Uint32, Uint8)
void SDL_drawLine (SDL_Surface *, int, int, int, int, Uint32)
void SDL_drawLine_AA (SDL_Surface *, int, int, int, int, Uint32)
void SDL_drawLine_Alpha (SDL_Surface *, int, int, int, int, Uint32, Uint8)
void SDL_drawLine_Alpha_AA (SDL_Surface *, int, int, int, int, Uint32, Uint8)
void SDL_drawCircle (SDL_Surface *, int, int, int, Uint32)
void SDL_drawCircle_AA (SDL_Surface *, int, int, int, Uint32)
void SDL_drawCircle_Alpha (SDL_Surface *, int, int, int, Uint32, Uint8)
void SDL_drawCircle_Alpha_AA (SDL_Surface *, int, int, int, Uint32, Uint8)
void SDL_fillCircle (SDL_Surface *, int, int, int, Uint32)
void SDL_fillCircle_AA (SDL_Surface *, int, int, int, Uint32)
void SDL_fillCircle_Alpha (SDL_Surface *, int, int, int, Uint32, Uint8)
void SDL_fillCircle_Alpha_AA (SDL_Surface *, int, int, int, Uint32, Uint8)
void SDL_drawTriangle (SDL_Surface *, int, int, int, int, int, int, Uint32)
void SDL_drawTriangle_AA (SDL_Surface *, int, int, int, int, int, int, Uint32)
void SDL_drawTriangle_Alpha (SDL_Surface *, int, int, int, int, int, int, Uint32, Uint8)
void SDL_drawTriangle_Alpha_AA (SDL_Surface *, int, int, int, int, int, int, Uint32, Uint8)
void SDL_fillTriangle (SDL_Surface *, int, int, int, int, int, int, Uint32)
void SDL_fillTriangle_AA (SDL_Surface *, int, int, int, int, int, int, Uint32)
void SDL_fillTriangle_Alpha (SDL_Surface *, int, int, int, int, int, int, Uint32, Uint8)
void SDL_fillTriangle_Alpha_AA (SDL_Surface *, int, int, int, int, int, int, Uint32, Uint8)

Define Documentation

#define __SDL_PRIM_H   1
 

Definition at line 2 of file SDL_prim.h.

Function Documentation

void __slow_SDL_blendPixel (  SDL_Surface *  ,
int  ,
int  ,
Uint32  ,
Uint8 
)  [inline]
 

Definition at line 88 of file SDL_prim.cpp.

References SDL_getPixel(), and SDL_putPixel().

Referenced by SDL_blendPixel(). 

00090 {
00091         Uint8 *p;
00092         Uint8 r, g, b, r2, g2, b2;
00093 
00094         if ( (p = SDL_getPixel(surf, x, y)) ) {
00095                 SDL_GetRGB(clr, surf->format, &r, &g, &b);
00096                 SDL_GetRGB(*p, surf->format, &r2, &g2, &b2);
00097 
00098                 r = r2 + ( r - r2 ) * ( alpha / 255.0 );
00099                 g = g2 + ( g - g2 ) * ( alpha / 255.0 );
00100                 b = b2 + ( b - b2 ) * ( alpha / 255.0 );
00101 
00102                 clr = SDL_MapRGB(surf->format, r, g, b);
00103 
00104                 SDL_putPixel(surf, x, y, clr);
00105         }
00106 }

void SDL_blendPixel (  SDL_Surface *  ,
int  ,
int  ,
Uint32  ,
Uint8 
)  [inline]
 

Definition at line 113 of file SDL_prim.cpp.

References __slow_SDL_blendPixel(), and SDL_getPixel().

Referenced by _SDL_fillCircle_Alpha_AA(), SDL_drawCircle_Alpha_AA(), SDL_drawLine_Alpha(), SDL_drawLine_Alpha_AA(), SDL_fillTriangle_Alpha(), and SDL_fillTriangle_Alpha_AA(). 

00115 {
00116         Uint8 *p;
00117         Uint32 R, G, B;
00118         Uint32 Rmask = surf->format->Rmask;
00119         Uint32 Gmask = surf->format->Gmask;
00120         Uint32 Bmask = surf->format->Bmask;
00121 
00122         if ( (p = SDL_getPixel(surf, x, y)) ) {
00123                 switch(surf->format->BytesPerPixel) {
00124                 case 1:  /* 8 bpp */
00125                         __slow_SDL_blendPixel(surf, x, y, clr, alpha);
00126                         break;
00127 
00128                 case 2:  /* 16 bpp */
00129                         R = ( (*(Uint16*)p & Rmask) + ( ((clr & Rmask) - ((*(Uint16*)p) & Rmask)) * alpha >> 8) ) & Rmask;
00130                         G = ( (*(Uint16*)p & Gmask) + ( ((clr & Gmask) - ((*(Uint16*)p) & Gmask)) * alpha >> 8) ) & Gmask;
00131                         B = ( (*(Uint16*)p & Bmask) + ( ((clr & Bmask) - ((*(Uint16*)p) & Bmask)) * alpha >> 8) ) & Bmask;
00132                         *(Uint16*)p = R | G | B;
00133                         break;
00134 
00135                 case 3:  /* 24 bpp */
00136                         __slow_SDL_blendPixel(surf, x, y, clr, alpha);
00137                         break;
00138 
00139                 case 4:  /* 32 bpp */
00140                         R = ( (*(Uint32*)p & Rmask) + ( ((clr & Rmask) - (*(Uint32*)p & Rmask)) * alpha >> 8) ) & Rmask;
00141                         G = ( (*(Uint32*)p & Gmask) + ( ((clr & Gmask) - (*(Uint32*)p & Gmask)) * alpha >> 8) ) & Gmask;
00142                         B = ( (*(Uint32*)p & Bmask) + ( ((clr & Bmask) - (*(Uint32*)p & Bmask)) * alpha >> 8) ) & Bmask;
00143                         *(Uint32*)p = R | G | B;
00144                         break;
00145                 }
00146         }
00147 }

void SDL_drawCircle (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 287 of file SDL_prim.cpp.

References SDL_putPixel(). 

00288 {
00289         int x, y;
00290 
00291         for (x = 0; x <= r / 1.4; x++) {
00292                 y = 0.5 + sqrt( (r * r) - (x * x) );
00293                 SDL_putPixel(surf, x1 + x, y1 + y, clr);
00294                 SDL_putPixel(surf, x1 + x, y1 + -1 * y, clr);
00295                 SDL_putPixel(surf, x1 + -1 * x, y1 + -1 * y, clr);
00296                 SDL_putPixel(surf, x1 + -1 * x, y1 + y, clr);
00297 
00298                 /* rotated 90 deg */
00299 
00300                 SDL_putPixel(surf, x1 + y, y1 + x, clr);
00301                 SDL_putPixel(surf, x1 + y, y1 + -1 * x, clr);
00302                 SDL_putPixel(surf, x1 + -1 * y, y1 + -1 * x, clr);
00303                 SDL_putPixel(surf, x1 + -1 * y, y1 + x, clr);
00304         }
00305 }

void SDL_drawCircle_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 311 of file SDL_prim.cpp.

References SDL_drawCircle_Alpha_AA(). 

00312 {
00313         SDL_drawCircle_Alpha_AA(surf, x1, y1, r, clr, 255);
00314 }

void SDL_drawCircle_Alpha (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

void SDL_drawCircle_Alpha_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 320 of file SDL_prim.cpp.

References SDL_blendPixel().

Referenced by SDL_drawCircle_AA(), and SDL_fillCircle_AA(). 

00322 {
00323         int x, y;
00324         float aa;
00325 
00326         /* alpha *= SDL_ALPHA_REDUCER; */
00327 
00328         for (x = 0; x <= r; x++) {
00329                 aa = sqrt( (r * r) - (x * x) );
00330                 y = (int)aa;
00331                 aa = (aa - y) * alpha;
00332 
00333                 /*
00334                  * x and y values converge 1/8 around the circle.
00335                  * we're drawing around the circle 8 different ways,
00336                  * so we need to stop to prevent overlapping.  this is
00337                  * very tricky as different radius circles will be off
00338                  * by one.
00339                  *
00340                  * as is, this function currently misses anti-aliasing
00341                  * 4 pixels on some circles.
00342                  */
00343 
00344                 if (x <= y) {
00345                         SDL_blendPixel(surf, x1 + x, y1 + y, clr, alpha);
00346                         SDL_blendPixel(surf, x1 + x, y1 + y + 1, clr, aa);
00347 
00348                         SDL_blendPixel(surf, x1 + x, y1 - y, clr, alpha);
00349                         SDL_blendPixel(surf, x1 + x, y1 - y - 1, clr, aa);
00350                 }
00351                 if (x < y) {
00352                         SDL_blendPixel(surf, x1 + x, y1 + y - 1, clr, alpha - aa);
00353                         SDL_blendPixel(surf, x1 + x, y1 - y + 1, clr, alpha - aa);
00354                 }
00355 
00356                 if (x > 0) {
00357                         if (x <= y) {
00358                                 SDL_blendPixel(surf, x1 - x, y1 + y, clr, alpha);
00359                                 SDL_blendPixel(surf, x1 - x, y1 + y + 1, clr, aa);
00360                                 SDL_blendPixel(surf, x1 - x, y1 - y, clr, alpha);
00361                                 SDL_blendPixel(surf, x1 - x, y1 - y - 1, clr, aa);
00362                         }
00363 
00364                         if (x < y) {
00365                                 SDL_blendPixel(surf, x1 - x, y1 + y - 1, clr, alpha - aa);
00366                                 SDL_blendPixel(surf, x1 - x, y1 - y + 1, clr, alpha - aa);
00367                         }
00368                 }
00369 
00370                 /* rotated 90deg */
00371 
00372                 if (x < y) {
00373                         SDL_blendPixel(surf, x1 + y, y1 + x, clr, alpha);
00374                         SDL_blendPixel(surf, x1 + y + 1, y1 + x, clr, aa);
00375                         SDL_blendPixel(surf, x1 + y - 1, y1 + x, clr, alpha - aa);
00376 
00377                         SDL_blendPixel(surf, x1 - y, y1 + x, clr, alpha);
00378                         SDL_blendPixel(surf, x1 - y - 1, y1 + x, clr, aa);
00379                         SDL_blendPixel(surf, x1 - y + 1, y1 + x, clr, alpha - aa);
00380 
00381                         if (x > 0) {
00382                                 SDL_blendPixel(surf, x1 + y, y1 - x, clr, alpha);
00383                                 SDL_blendPixel(surf, x1 + y + 1, y1 - x, clr, aa);
00384                                 SDL_blendPixel(surf, x1 + y - 1, y1 - x, clr, alpha - aa);
00385 
00386                                 SDL_blendPixel(surf, x1 - y, y1 - x, clr, alpha);
00387                                 SDL_blendPixel(surf, x1 - y - 1, y1 - x, clr, aa);
00388                                 SDL_blendPixel(surf, x1 - y + 1, y1 - x, clr, alpha - aa);
00389                         }
00390                 }
00391 
00392                 if (x > y)
00393                         break;
00394         }
00395 }

void SDL_drawLine (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 153 of file SDL_prim.cpp.

References SDL_putPixel().

Referenced by SDL_drawTriangle(). 

00155 {
00156         int x, y, dx, dy, c;
00157         float slope;
00158 
00159         dx = x2 - x1;  /* change in x */
00160         dy = y2 - y1;  /* change in y */
00161 
00162         slope = (float)dy / dx;
00163 
00164         if (abs(dx) >= abs(dy)) {
00165                 /* draw left/right - right/left */
00166                 c = (x1 <= x2) ? 1 : -1;
00167                 for (x = x1; x != x2 + c; x += c) {
00168                         y = y1 + ( (x - x1) * slope + 0.5 );
00169                         SDL_putPixel(surf, x, y, clr);
00170                 }
00171         }
00172         else {
00173                 /* draw top/bottom - bottom/top */
00174                 c = (y1 <= y2) ? 1 : -1;
00175                 for (y = y1; y != y2 + c; y += c) {
00176                         x = x1 + ( (y - y1) / slope + 0.5 );
00177                         SDL_putPixel(surf, x, y, clr);
00178                 }
00179         }
00180 }

void SDL_drawLine_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 186 of file SDL_prim.cpp.

References SDL_drawLine_Alpha_AA().

Referenced by SDL_drawTriangle_AA(). 

00188 {
00189         SDL_drawLine_Alpha_AA(surf, x1, y1, x2, y2, clr, 255);
00190 }

void SDL_drawLine_Alpha (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 196 of file SDL_prim.cpp.

References SDL_blendPixel().

Referenced by SDL_drawTriangle_Alpha(). 

00198 {
00199         int x, y, dx, dy, c;
00200         float slope;
00201 
00202         dx = x2 - x1;
00203         dy = y2 - y1;
00204 
00205         slope = (float)dy / dx;
00206 
00207         if (abs(dx) >= abs(dy)) {
00208                 /* draw left/right - right/left */
00209                 c = (x1 <= x2) ? 1 : -1;
00210                 for (x = x1; x != x2 + c; x += c) {
00211                         y = y1 + ( (x - x1) * slope + 0.5 );
00212                         SDL_blendPixel(surf, x, y, clr, alpha);
00213                 }
00214         }
00215         else {
00216                 /* draw top/bottom - bottom/top */
00217                 c = (y1 <= y2) ? 1 : -1;
00218                 for (y = y1; y != y2 + c; y += c) {
00219                         x = x1 + ( (y - y1) / slope + 0.5 );
00220                         SDL_blendPixel(surf, x, y, clr, alpha);
00221                 }
00222         }
00223 }

void SDL_drawLine_Alpha_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 229 of file SDL_prim.cpp.

References SDL_blendPixel(), and SDL_putPixel().

Referenced by SDL_drawLine_AA(), and SDL_drawTriangle_Alpha_AA(). 

00231 {
00232         int x, y, dx, dy, c;
00233         float aa;
00234         float slope;
00235 
00236         dx = x2 - x1;
00237         dy = y2 - y1;
00238 
00239         /* alpha *= SDL_ALPHA_REDUCER; */
00240 
00241         slope = (float)dy / dx;
00242 
00243         if (abs(dx) >= abs(dy)) {
00244                 /* draw left/right - right/left */
00245                 c = (x1 <= x2) ? 1 : -1;
00246                 for (x = x1; x != x2 + c; x += c) {
00247                         /*
00248                          * aa is the fill percentage of the pixel adjacent
00249                          * the current one.  same for below
00250                          */
00251                         aa = y1 + ( (x - x1) * slope + 0.5 );
00252                         y = (int)aa;
00253 
00254                         aa = ( aa - y ) * alpha;
00255 
00256                         if (alpha > 254)
00257                                 SDL_putPixel(surf, x, y, clr);
00258                         else
00259                                 SDL_blendPixel(surf, x, y, clr, alpha);
00260                         SDL_blendPixel(surf, x, y + 1, clr, (int)aa);
00261                         SDL_blendPixel(surf, x, y - 1, clr, alpha - (int)aa);
00262                 }
00263         }
00264         else {
00265                 /* draw top/bottom - bottom/top */
00266                 c = (y1 <= y2) ? 1 : -1;
00267                 for (y = y1; y != y2 + c; y += c) {
00268                         aa = x1 + ( (y - y1) / slope + 0.5 );
00269                         x = (int)aa;
00270 
00271                         aa = ( aa - x ) * alpha;
00272 
00273                         if (alpha > 254)
00274                                 SDL_putPixel(surf, x, y, clr);
00275                         else
00276                                 SDL_blendPixel(surf, x, y, clr, alpha);
00277                         SDL_blendPixel(surf, x + 1, y, clr, (int)aa);
00278                         SDL_blendPixel(surf, x - 1, y, clr, alpha - (int)aa);
00279                 }
00280         }
00281 }

void SDL_drawTriangle (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 507 of file SDL_prim.cpp.

References SDL_drawLine(). 

00509 {
00510         SDL_drawLine(surf, x1, y1, x2, y2, clr);
00511         SDL_drawLine(surf, x2, y2, x3, y3, clr);
00512         SDL_drawLine(surf, x3, y3, x1, y1, clr);
00513 }

void SDL_drawTriangle_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 519 of file SDL_prim.cpp.

References SDL_drawLine_AA().

Referenced by SDL_fillTriangle_AA(). 

00521 {
00522         SDL_drawLine_AA(surf, x1, y1, x2, y2, clr);
00523         SDL_drawLine_AA(surf, x2, y2, x3, y3, clr);
00524         SDL_drawLine_AA(surf, x3, y3, x1, y1, clr);
00525 }

void SDL_drawTriangle_Alpha (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 531 of file SDL_prim.cpp.

References SDL_drawLine_Alpha(). 

00533 {
00534         SDL_drawLine_Alpha(surf, x1, y1, x2, y2, clr, alpha);
00535         SDL_drawLine_Alpha(surf, x2, y2, x3, y3, clr, alpha);
00536         SDL_drawLine_Alpha(surf, x3, y3, x1, y1, clr, alpha);
00537 }

void SDL_drawTriangle_Alpha_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 543 of file SDL_prim.cpp.

References SDL_drawLine_Alpha_AA(). 

00546 {
00547         SDL_drawLine_Alpha_AA(surf, x1, y1, x2, y2, clr, alpha);
00548         SDL_drawLine_Alpha_AA(surf, x2, y2, x3, y3, clr, alpha);
00549         SDL_drawLine_Alpha_AA(surf, x3, y3, x1, y1, clr, alpha);
00550 }

void SDL_fillCircle (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 401 of file SDL_prim.cpp.

References SDL_putPixel().

Referenced by SDL_fillCircle_AA(). 

00402 {
00403         int x, y;
00404 
00405         SDL_putPixel(surf, x1, y1, clr);
00406         for (x = 0; x <= r / 1.4; x++) {
00407                 for (y = 0.5 + sqrt( (r * r) - (x * x) ); y > 0; --y) {
00408                         SDL_putPixel(surf, x1 + x, y1 + y, clr);
00409                         SDL_putPixel(surf, x1 + x, y1 + -1 * y, clr);
00410                         SDL_putPixel(surf, x1 + -1 * x, y1 + -1 * y, clr);
00411                         SDL_putPixel(surf, x1 + -1 * x, y1 + y, clr);
00412 
00413                         /* rotated 90 deg */
00414 
00415                         SDL_putPixel(surf, x1 + y, y1 + x, clr);
00416                         SDL_putPixel(surf, x1 + y, y1 + -1 * x, clr);
00417                         SDL_putPixel(surf, x1 + -1 * y, y1 + -1 * x, clr);
00418                         SDL_putPixel(surf, x1 + -1 * y, y1 + x, clr);
00419                 }
00420         }
00421 }

void SDL_fillCircle_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 428 of file SDL_prim.cpp.

References SDL_drawCircle_Alpha_AA(), and SDL_fillCircle(). 

00429 {
00430         SDL_drawCircle_Alpha_AA(surf, x1, y1, r, clr, 255);
00431         SDL_fillCircle(surf, x1, y1, r - 1, clr);
00432 }

void SDL_fillCircle_Alpha (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 487 of file SDL_prim.cpp.

References _SDL_fillCircle_Alpha_AA(). 

00489 {
00490         _SDL_fillCircle_Alpha_AA( surf, x1, y1, r, clr, alpha, 0 );
00491 }

void SDL_fillCircle_Alpha_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 497 of file SDL_prim.cpp.

References _SDL_fillCircle_Alpha_AA(). 

00499 {
00500         _SDL_fillCircle_Alpha_AA( surf, x1, y1, r, clr, alpha, 1 );
00501 }

void SDL_fillTriangle (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 556 of file SDL_prim.cpp.

References SDL_putPixel().

Referenced by gui::PopupMenuItem::Draw(), gui::Button::Draw(), and SDL_fillTriangle_AA(). 

00558 {
00559         short int skipone = 1;
00560         int x, y, c, dx, dy, miny, maxy;
00561         float slope1, slope2, slope3;
00562 
00563         /*
00564          * sort points by X coordinate so we can split the drawing
00565          * at a slope change
00566          */
00567         while ( !(x1 <= x2 && x1 <= x3) ) {
00568                 x = x1;
00569                 y = y1;
00570                 x1 = x2;
00571                 y1 = y2;
00572                 x2 = x3;
00573                 y2 = y3;
00574                 x3 = x;
00575                 y3 = y;
00576         }
00577         while ( !(x2 <= x3) ) {
00578                 x = x2;
00579                 y = y2;
00580                 x2 = x3;
00581                 y2 = y3;
00582                 x3 = x;
00583                 y3 = y;
00584         }
00585 
00586         dx = x3 - x1;
00587         dy = y3 - y1;
00588         slope1 = (float)dy / dx;
00589 
00590         dx = x1 - x2;
00591         dy = y1 - y2;
00592         slope2 = (float)dy / dx;
00593 
00594         dx = x2 - x3;
00595         dy = y2 - y3;
00596         slope3 = (float)dy / dx;
00597 
00598         /*
00599          * draw between first two x,y coordinates
00600          */
00601         if (x1 != x2) {
00602                 for (x = x1; x <= x2; x++) {
00603                         miny = y1 + ( (x - x1) * slope1 + 0.5 );
00604                         maxy = y2 + ( (x - x2) * slope2 + 0.5 );
00605                         c = (miny < maxy) ? 1 : -1;
00606                         for (y = miny; y != maxy + c; y += c) {
00607                                 SDL_putPixel(surf, x, y, clr);
00608                         }
00609                 }
00610         }
00611         else
00612                 skipone = 0;
00613 
00614         /*
00615          * draw between second two x,y coordinates
00616          */
00617         if (x2 != x3) {
00618                 for (x = x2 + skipone; x <= x3; x++) {
00619                         miny = y1 + ( (x - x1) * slope1 + 0.5 );
00620                         maxy = y3 + ( (x - x3) * slope3 + 0.5 );
00621                         c = (miny < maxy) ? 1 : -1;
00622                         for (y = miny; y != maxy + c; y += c) {
00623                                 SDL_putPixel(surf, x, y, clr);
00624                         }
00625                 }
00626         }
00627 }

void SDL_fillTriangle_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32 
) 
 

Definition at line 633 of file SDL_prim.cpp.

References SDL_drawTriangle_AA(), and SDL_fillTriangle(). 

00635 {
00636         SDL_drawTriangle_AA( surf, x1, y1, x2, y2, x3, y3, clr );
00637         SDL_fillTriangle( surf, x1, y1, x2, y2, x3, y3, clr );
00638 }

void SDL_fillTriangle_Alpha (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 644 of file SDL_prim.cpp.

References SDL_blendPixel(). 

00646 {
00647         short int skipone = 1;
00648         int x, y, c, dx, dy, miny, maxy;
00649         float slope1, slope2, slope3;
00650 
00651         /*
00652          * sort points by X coordinate so we can split the drawing
00653          * at a slope change
00654          */
00655         while ( !(x1 <= x2 && x1 <= x3) ) {
00656                 x = x1;
00657                 y = y1;
00658                 x1 = x2;
00659                 y1 = y2;
00660                 x2 = x3;
00661                 y2 = y3;
00662                 x3 = x;
00663                 y3 = y;
00664         }
00665         while ( !(x2 <= x3) ) {
00666                 x = x2;
00667                 y = y2;
00668                 x2 = x3;
00669                 y2 = y3;
00670                 x3 = x;
00671                 y3 = y;
00672         }
00673 
00674         dx = x3 - x1;
00675         dy = y3 - y1;
00676         slope1 = (float)dy / dx;
00677 
00678         dx = x1 - x2;
00679         dy = y1 - y2;
00680         slope2 = (float)dy / dx;
00681 
00682         dx = x2 - x3;
00683         dy = y2 - y3;
00684         slope3 = (float)dy / dx;
00685 
00686         /*
00687          * draw between first two x,y coordinates
00688          */
00689         if (x1 != x2) {
00690                 for (x = x1; x <= x2; x++) {
00691                         miny = y1 + ( (x - x1) * slope1 + 0.5 );
00692                         maxy = y2 + ( (x - x2) * slope2 + 0.5 );
00693                         c = (miny < maxy) ? 1 : -1;
00694                         for (y = miny; y != maxy + c; y += c) {
00695                                 SDL_blendPixel(surf, x, y, clr, alpha);
00696                         }
00697                 }
00698         }
00699         else
00700                 skipone = 0;
00701 
00702         /*
00703          * draw between second two x,y coordinates
00704          */
00705         if (x2 != x3) {
00706                 for (x = x2 + skipone; x <= x3; x++) {
00707                         miny = y1 + ( (x - x1) * slope1 + 0.5 );
00708                         maxy = y3 + ( (x - x3) * slope3 + 0.5 );
00709                         c = (miny < maxy) ? 1 : -1;
00710                         for (y = miny; y != maxy + c; y += c) {
00711                                 SDL_blendPixel(surf, x, y, clr, alpha);
00712                         }
00713                 }
00714         }
00715 }

void SDL_fillTriangle_Alpha_AA (  SDL_Surface *  ,
int  ,
int  ,
int  ,
int  ,
int  ,
int  ,
Uint32  ,
Uint8 
) 
 

Definition at line 721 of file SDL_prim.cpp.

References SDL_blendPixel(). 

00724 {
00725         short int skipone = 1;
00726         int x, y, c, dx, dy, miny, maxy;
00727         float slope1, slope2, slope3;
00728         float minaa, maxaa;
00729 
00730         /*
00731          * sort points by X coordinate so we can split the drawing
00732          * at a slope change
00733          */
00734         while ( !(x1 <= x2 && x1 <= x3) ) {
00735                 x = x1;
00736                 y = y1;
00737                 x1 = x2;
00738                 y1 = y2;
00739                 x2 = x3;
00740                 y2 = y3;
00741                 x3 = x;
00742                 y3 = y;
00743         }
00744         while ( !(x2 <= x3) ) {
00745                 x = x2;
00746                 y = y2;
00747                 x2 = x3;
00748                 y2 = y3;
00749                 x3 = x;
00750                 y3 = y;
00751         }
00752 
00753         dx = x3 - x1;
00754         dy = y3 - y1;
00755         slope1 = (float)dy / dx;
00756 
00757         dx = x1 - x2;
00758         dy = y1 - y2;
00759         slope2 = (float)dy / dx;
00760 
00761         dx = x2 - x3;
00762         dy = y2 - y3;
00763         slope3 = (float)dy / dx;
00764 
00765         /*
00766          * draw between first two x,y coordinates
00767          */
00768         if (x1 != x2) {
00769                 for (x = x1; x <= x2; x++) {
00770                         minaa = y1 + ( (x - x1) * slope1 );
00771                         maxaa = y2 + ( (x - x2) * slope2 );
00772 
00773                         miny = (int)minaa;
00774                         maxy = (int)maxaa;
00775 
00776                         minaa = (minaa - miny) * alpha;
00777                         maxaa = (maxaa - maxy) * alpha;
00778 
00779                         c = (miny < maxy) ? 1 : -1;
00780                         for (y = miny; y != maxy + c; y += c) {
00781                                 SDL_blendPixel(surf, x, y, clr, alpha);
00782                         }
00783                         if (c > 0) {
00784                                 SDL_blendPixel(surf, x, miny - c, clr, alpha - minaa);
00785                                 SDL_blendPixel(surf, x, maxy + c, clr, maxaa);
00786                         }
00787                         else {
00788                                 SDL_blendPixel(surf, x, miny - c, clr, minaa);
00789                                 SDL_blendPixel(surf, x, maxy + c, clr, alpha - maxaa);
00790                         }
00791                 }
00792         }
00793         else
00794                 skipone = 0;
00795 
00796         /*
00797          * draw between second two x,y coordinates
00798          */
00799         if (x2 != x3) {
00800                 for (x = x2 + skipone; x <= x3; x++) {
00801                         minaa = y1 + ( (x - x1) * slope1 );
00802                         maxaa = y3 + ( (x - x3) * slope3 );
00803 
00804                         miny = (int)minaa;
00805                         maxy = (int)maxaa;
00806 
00807                         minaa = (minaa - miny) * alpha;
00808                         maxaa = (maxaa - maxy) * alpha;
00809 
00810                         c = (miny < maxy) ? 1 : -1;
00811                         for (y = miny; y != maxy + c; y += c) {
00812                                 SDL_blendPixel(surf, x, y, clr, alpha);
00813                         }
00814                         if (c > 0) {
00815                                 SDL_blendPixel(surf, x, miny - c, clr, alpha - minaa);
00816                                 SDL_blendPixel(surf, x, maxy + c, clr, maxaa);
00817                         }
00818                         else {
00819                                 SDL_blendPixel(surf, x, miny - c, clr, minaa);
00820                                 SDL_blendPixel(surf, x, maxy + c, clr, alpha - maxaa);
00821                         }
00822                 }
00823         }
00824 }

Uint8* SDL_getPixel (  SDL_Surface *  ,
int  ,
int 
)  [inline]
 

Definition at line 69 of file SDL_prim.cpp.

Referenced by __slow_SDL_blendPixel(), and SDL_blendPixel(). 

00070 {
00071         int Bpp = surf->format->BytesPerPixel;
00072 
00073         if (! (x < 0 || x >= surf->w || y < 0 || y >= surf->h) )
00074                 return (Uint8*)surf->pixels + y * surf->pitch + x * Bpp;
00075         else
00076                 return 0;
00077 }

void SDL_putPixel (  SDL_Surface *  ,
int  ,
int  ,
Uint32 
)  [inline]
 

Definition at line 27 of file SDL_prim.cpp.

Referenced by __slow_SDL_blendPixel(), SDL_drawCircle(), SDL_drawLine(), SDL_drawLine_Alpha_AA(), SDL_fillCircle(), and SDL_fillTriangle(). 

00028 {
00029         int Bpp = surf->format->BytesPerPixel;
00030         Uint8 *p;
00031 
00032         if (! (x < 0 || x >= surf->w || y < 0 || y >= surf->h) )
00033         {
00034                 p = (Uint8*)surf->pixels + y * surf->pitch + x * Bpp;
00035 
00036                 switch(Bpp) {
00037                 case 1:
00038                         *p = clr;
00039                         break;
00040 
00041                 case 2:
00042                         *(Uint16*)p = clr;
00043                         break;
00044 
00045                 case 3:
00046                         if (SDL_BYTEORDER == SDL_BIG_ENDIAN) {
00047                                 p[0] = (clr >> 16) & 0xff;
00048                                 p[1] = (clr >> 8) & 0xff;
00049                                 p[2] = clr & 0xff;
00050                         } else {
00051                                 p[0] = clr & 0xff;
00052                                 p[1] = (clr >> 8) & 0xff;
00053                                 p[2] = (clr >> 16) & 0xff;
00054                         }
00055                         break;
00056 
00057                 case 4:
00058                         *(Uint32*)p = clr;
00059                         break;
00060                 }
00061         }
00062 }

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