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| /*! |
| \file Draw_FillEllipse.c |
| \author Mario Palomo <mpalomo@ihman.com> |
| \author Jose M. de la Huerga Fernández |
| \author Pepe González Mora |
| \date 05-2002 |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with this library; if not, write to the Free Foundation, |
| Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #if SDL_DRAW_BPP == 1 |
| #define SDL_DRAW_PUTPIXEL \ |
| memset(((Uint8*)super->pixels+ (y0+y)*super->pitch+ (x0-x)), \ |
| color, 2*x+1); \ |
| memset(((Uint8*)super->pixels+ (y0-y)*super->pitch+ (x0-x)), \ |
| color, 2*x+1); |
| |
| |
| #elif SDL_DRAW_BPP == 2 |
| #define SDL_DRAW_PUTPIXEL \ |
| { \ |
| p0 = ((Uint8*)super->pixels+ (y0+y)*super->pitch+ (x0-x)*2); \ |
| p1 = ((Uint8*)super->pixels+ (y0-y)*super->pitch+ (x0-x)*2); \ |
| i = 2*x+1; \ |
| switch( i % 4 ) { \ |
| do{ \ |
| case 0: *(Uint16*)p0 = color; *(Uint16*)p1 = color; \ |
| p0+=2; p1+=2; \ |
| case 3: *(Uint16*)p0 = color; *(Uint16*)p1 = color; \ |
| p0+=2; p1+=2; \ |
| case 2: *(Uint16*)p0 = color; *(Uint16*)p1 = color; \ |
| p0+=2; p1+=2; \ |
| case 1: *(Uint16*)p0 = color; *(Uint16*)p1 = color; \ |
| p0+=2; p1+=2; \ |
| }while( (i-=4) > 0 ); \ |
| } \ |
| } |
| |
| |
| #elif SDL_DRAW_BPP == 3 |
| #define SDL_DRAW_PUTPIXEL_BPP_3_AUX \ |
| if (SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ |
| p0[0] = colorbyte2; \ |
| p0[1] = colorbyte1; \ |
| p0[2] = colorbyte0; \ |
| p1[0] = colorbyte2; \ |
| p1[1] = colorbyte1; \ |
| p1[2] = colorbyte0; \ |
| } else { \ |
| p0[0] = colorbyte0; \ |
| p0[1] = colorbyte1; \ |
| p0[2] = colorbyte2; \ |
| p1[0] = colorbyte0; \ |
| p1[1] = colorbyte1; \ |
| p1[2] = colorbyte2; \ |
| } |
| |
| #define SDL_DRAW_PUTPIXEL \ |
| { \ |
| p0 = ((Uint8*)super->pixels+ (y0+y)*super->pitch+ (x0-x)*3); \ |
| p1 = ((Uint8*)super->pixels+ (y0-y)*super->pitch+ (x0-x)*3); \ |
| i = 2*x+1; \ |
| switch( i % 4 ) { \ |
| do{ \ |
| case 0: SDL_DRAW_PUTPIXEL_BPP_3_AUX \ |
| p0+=3; p1+=3; \ |
| case 3: SDL_DRAW_PUTPIXEL_BPP_3_AUX \ |
| p0+=3; p1+=3; \ |
| case 2: SDL_DRAW_PUTPIXEL_BPP_3_AUX \ |
| p0+=3; p1+=3; \ |
| case 1: SDL_DRAW_PUTPIXEL_BPP_3_AUX \ |
| p0+=3; p1+=3; \ |
| }while( (i-=4) > 0 ); \ |
| } \ |
| } |
| |
| |
| #elif SDL_DRAW_BPP == 4 |
| |
| #ifdef __linux__ |
| #define SDL_DRAW_WMEMSET_START \ |
| if (sizeof(wchar_t) == sizeof(Uint32)) { \ |
| wmemset( (wchar_t*)((Uint8*)super->pixels+ (y0+y)*super->pitch+ (x0-x)*4), \ |
| color, 2*x+1); \ |
| wmemset( (wchar_t*)((Uint8*)super->pixels+ (y0-y)*super->pitch+ (x0-x)*4), \ |
| color, 2*x+1); \ |
| } else { |
| #define SDL_DRAW_WMEMSET_END } |
| #else |
| #define SDL_DRAW_WMEMSET_START |
| #define SDL_DRAW_WMEMSET_END |
| #endif |
| |
| #define SDL_DRAW_PUTPIXEL \ |
| SDL_DRAW_WMEMSET_START \ |
| p0 = ((Uint8*)super->pixels+ (y0+y)*super->pitch+ (x0-x)*4); \ |
| p1 = ((Uint8*)super->pixels+ (y0-y)*super->pitch+ (x0-x)*4); \ |
| i = 2*x+1; \ |
| switch( i % 4 ) { \ |
| do{ \ |
| case 0: *(Uint32*)p0 = color; *(Uint32*)p1 = color; \ |
| p0+=4; p1+=4; \ |
| case 3: *(Uint32*)p0 = color; *(Uint32*)p1 = color; \ |
| p0+=4; p1+=4; \ |
| case 2: *(Uint32*)p0 = color; *(Uint32*)p1 = color; \ |
| p0+=4; p1+=4; \ |
| case 1: *(Uint32*)p0 = color; *(Uint32*)p1 = color; \ |
| p0+=4; p1+=4; \ |
| }while( (i-=4) > 0 ); \ |
| } \ |
| SDL_DRAW_WMEMSET_END |
| |
| #endif /*SDL_DRAW_BPP*/ |
| |
| |
| |
| void SDL_DRAWFUNCTION(SDL_Surface *super, |
| Sint16 x0, Sint16 y0, |
| Uint16 Xradius, Uint16 Yradius, |
| Uint32 color) |
| { |
| #if SDL_DRAW_BPP == 3 |
| Uint8 colorbyte0 = (Uint8) (color & 0xff); |
| Uint8 colorbyte1 = (Uint8) ((color >> 8) & 0xff); |
| Uint8 colorbyte2 = (Uint8) ((color >> 16) & 0xff); |
| #endif |
| |
| #if SDL_DRAW_BPP != 1 |
| register Uint8 *p0; |
| register Uint8 *p1; |
| register Sint16 i; |
| #endif |
| |
| Sint32 x, y; |
| Sint32 Xchange, Ychange; |
| Sint32 EllipseError; |
| Sint32 TwoASquare, TwoBSquare; |
| Sint32 StoppingX, StoppingY; |
| |
| TwoASquare = 2*Xradius*Xradius; |
| TwoBSquare = 2*Yradius*Yradius; |
| |
| /*1st set of points*/ |
| x = Xradius-1; /*radius zero == draw nothing*/ |
| y = 0; |
| |
| Xchange = Yradius*Yradius*(1-2*Xradius); |
| Ychange = Xradius*Xradius; |
| |
| EllipseError = 0; |
| |
| StoppingX = TwoBSquare*Xradius; |
| StoppingY = 0; |
| |
| /*Plot 2 ellipse scan lines for iteration*/ |
| while (StoppingX > StoppingY) { |
| |
| SDL_DRAW_PUTPIXEL |
| |
| ++y; |
| StoppingY += TwoASquare; |
| EllipseError += Ychange; |
| Ychange += TwoASquare; |
| if (( 2*EllipseError + Xchange) > 0) { |
| --x; |
| StoppingX -= TwoBSquare; |
| EllipseError += Xchange; |
| Xchange += TwoBSquare; |
| } |
| }/*while*/ |
| |
| /*2nd set of points*/ |
| x = 0; |
| y = Yradius-1; /*radius zero == draw nothing*/ |
| Xchange = Yradius*Yradius; |
| Ychange = Xradius*Xradius*(1-2*Yradius); |
| EllipseError = 0; |
| StoppingX = 0; |
| StoppingY = TwoASquare*Yradius; |
| |
| /*Plot 2 ellipse scan lines for iteration*/ |
| while (StoppingX < StoppingY) { |
| |
| SDL_DRAW_PUTPIXEL |
| |
| ++x; |
| StoppingX += TwoBSquare; |
| EllipseError += Xchange; |
| Xchange += TwoBSquare; |
| if ((2*EllipseError + Ychange) > 0) { |
| --y; |
| StoppingY -= TwoASquare; |
| EllipseError += Ychange; |
| Ychange += TwoASquare; |
| } |
| } |
| }/*Draw_FillEllipse*/ |
| |
| |
| #undef SDL_DRAW_PUTPIXEL |
| #undef SDL_DRAW_PUTPIXEL_BPP_3_AUX |
| |
| #undef SDL_DRAW_WMEMSET_START |
| #undef SDL_DRAW_WMEMSET_END |
| |