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00061 #include "guichan/sdl/sdlgraphics.hpp"
00062
00063 #include "guichan/exception.hpp"
00064 #include "guichan/font.hpp"
00065 #include "guichan/image.hpp"
00066 #include "guichan/sdl/sdlimage.hpp"
00067 #include "guichan/sdl/sdlpixel.hpp"
00068
00069
00070
00071 #ifndef ABS
00072 #define ABS(x) ((x)<0?-(x):(x))
00073 #endif
00074
00075 namespace gcn
00076 {
00077
00078 SDLGraphics::SDLGraphics()
00079 {
00080 mAlpha = false;
00081 }
00082
00083 void SDLGraphics::_beginDraw()
00084 {
00085 Rectangle area;
00086 area.x = 0;
00087 area.y = 0;
00088 area.width = mTarget->w;
00089 area.height = mTarget->h;
00090 pushClipArea(area);
00091 }
00092
00093 void SDLGraphics::_endDraw()
00094 {
00095 popClipArea();
00096 }
00097
00098 void SDLGraphics::setTarget(SDL_Surface* target)
00099 {
00100 mTarget = target;
00101 }
00102
00103 bool SDLGraphics::pushClipArea(Rectangle area)
00104 {
00105 SDL_Rect rect;
00106 bool result = Graphics::pushClipArea(area);
00107
00108 const ClipRectangle& carea = mClipStack.top();
00109 rect.x = carea.x;
00110 rect.y = carea.y;
00111 rect.w = carea.width;
00112 rect.h = carea.height;
00113
00114 SDL_SetClipRect(mTarget, &rect);
00115
00116 return result;
00117 }
00118
00119 void SDLGraphics::popClipArea()
00120 {
00121 Graphics::popClipArea();
00122
00123 if (mClipStack.empty())
00124 {
00125 return;
00126 }
00127
00128 const ClipRectangle& carea = mClipStack.top();
00129 SDL_Rect rect;
00130 rect.x = carea.x;
00131 rect.y = carea.y;
00132 rect.w = carea.width;
00133 rect.h = carea.height;
00134
00135 SDL_SetClipRect(mTarget, &rect);
00136 }
00137
00138 SDL_Surface* SDLGraphics::getTarget() const
00139 {
00140 return mTarget;
00141 }
00142
00143 void SDLGraphics::drawImage(const Image* image,
00144 int srcX,
00145 int srcY,
00146 int dstX,
00147 int dstY,
00148 int width,
00149 int height)
00150 {
00151 if (mClipStack.empty())
00152 {
00153 throw GCN_EXCEPTION("Clip stack is empty, perhaps you called a draw funtion outside of _beginDraw() and _endDraw()?");
00154 }
00155
00156 const ClipRectangle& top = mClipStack.top();
00157
00158 SDL_Rect src;
00159 SDL_Rect dst;
00160 src.x = srcX;
00161 src.y = srcY;
00162 src.w = width;
00163 src.h = height;
00164 dst.x = dstX + top.xOffset;
00165 dst.y = dstY + top.yOffset;
00166
00167 const SDLImage* srcImage = dynamic_cast<const SDLImage*>(image);
00168
00169 if (srcImage == NULL)
00170 {
00171 throw GCN_EXCEPTION("Trying to draw an image of unknown format, must be an SDLImage.");
00172 }
00173
00174 SDL_BlitSurface(srcImage->getSurface(), &src, mTarget, &dst);
00175 }
00176
00177 void SDLGraphics::fillRectangle(const Rectangle& rectangle)
00178 {
00179 if (mClipStack.empty())
00180 {
00181 throw GCN_EXCEPTION("Clip stack is empty, perhaps you called a draw funtion outside of _beginDraw() and _endDraw()?");
00182 }
00183
00184 const ClipRectangle& top = mClipStack.top();
00185
00186 Rectangle area = rectangle;
00187 area.x += top.xOffset;
00188 area.y += top.yOffset;
00189
00190 if(!area.intersect(top))
00191 {
00192 return;
00193 }
00194
00195 if (mAlpha)
00196 {
00197 int x1 = area.x > top.x ? area.x : top.x;
00198 int y1 = area.y > top.y ? area.y : top.y;
00199 int x2 = area.x + area.width < top.x + top.width ? area.x + area.width : top.x + top.width;
00200 int y2 = area.y + area.height < top.y + top.height ? area.y + area.height : top.y + top.height;
00201 int x, y;
00202
00203 SDL_LockSurface(mTarget);
00204 for (y = y1; y < y2; y++)
00205 {
00206 for (x = x1; x < x2; x++)
00207 {
00208 SDLputPixelAlpha(mTarget, x, y, mColor);
00209 }
00210 }
00211 SDL_UnlockSurface(mTarget);
00212
00213 }
00214 else
00215 {
00216 SDL_Rect rect;
00217 rect.x = area.x;
00218 rect.y = area.y;
00219 rect.w = area.width;
00220 rect.h = area.height;
00221
00222 Uint32 color = SDL_MapRGBA(mTarget->format,
00223 mColor.r,
00224 mColor.g,
00225 mColor.b,
00226 mColor.a);
00227 SDL_FillRect(mTarget, &rect, color);
00228 }
00229 }
00230
00231 void SDLGraphics::drawPoint(int x, int y)
00232 {
00233 if (mClipStack.empty())
00234 {
00235 throw GCN_EXCEPTION("Clip stack is empty, perhaps you called a draw funtion outside of _beginDraw() and _endDraw()?");
00236 }
00237
00238 const ClipRectangle& top = mClipStack.top();
00239
00240 x += top.xOffset;
00241 y += top.yOffset;
00242
00243 if(!top.isPointInRect(x,y))
00244 return;
00245
00246 if (mAlpha)
00247 {
00248 SDLputPixelAlpha(mTarget, x, y, mColor);
00249 }
00250 else
00251 {
00252 SDLputPixel(mTarget, x, y, mColor);
00253 }
00254 }
00255
00256 void SDLGraphics::drawHLine(int x1, int y, int x2)
00257 {
00258 if (mClipStack.empty())
00259 {
00260 throw GCN_EXCEPTION("Clip stack is empty, perhaps you called a draw funtion outside of _beginDraw() and _endDraw()?");
00261 }
00262
00263 const ClipRectangle& top = mClipStack.top();
00264
00265 x1 += top.xOffset;
00266 y += top.yOffset;
00267 x2 += top.xOffset;
00268
00269 if (y < top.y || y >= top.y + top.height)
00270 {
00271 return;
00272 }
00273
00274 if (x1 > x2)
00275 {
00276 x1 ^= x2;
00277 x2 ^= x1;
00278 x1 ^= x2;
00279 }
00280
00281 if (top.x > x1)
00282 {
00283 if (top.x > x2)
00284 {
00285 return;
00286 }
00287
00288 x1 = top.x;
00289 }
00290
00291 if (top.x + top.width <= x2)
00292 {
00293 if (top.x + top.width <= x1)
00294 {
00295 return;
00296 }
00297
00298 x2 = top.x + top.width -1;
00299 }
00300
00301 int bpp = mTarget->format->BytesPerPixel;
00302
00303 SDL_LockSurface(mTarget);
00304
00305 Uint8 *p = (Uint8 *)mTarget->pixels + y * mTarget->pitch + x1 * bpp;
00306
00307 Uint32 pixel = SDL_MapRGB(mTarget->format,
00308 mColor.r,
00309 mColor.g,
00310 mColor.b);
00311 Uint16* q;
00312 switch(bpp)
00313 {
00314 case 1:
00315 for (;x1 <= x2; ++x1)
00316 {
00317 *(p++) = pixel;
00318 }
00319 break;
00320
00321 case 2:
00322 {
00323 Uint16* q = (Uint16*)p;
00324 for (;x1 <= x2; ++x1)
00325 {
00326 *(q++) = pixel;
00327 }
00328 break;
00329 }
00330 case 3:
00331 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
00332 {
00333 for (;x1 <= x2; ++x1)
00334 {
00335 p[0] = (pixel >> 16) & 0xff;
00336 p[1] = (pixel >> 8) & 0xff;
00337 p[2] = pixel & 0xff;
00338 p += 3;
00339 }
00340 }
00341 else
00342 {
00343 for (;x1 <= x2; ++x1)
00344 {
00345 p[0] = pixel & 0xff;
00346 p[1] = (pixel >> 8) & 0xff;
00347 p[2] = (pixel >> 16) & 0xff;
00348 p += 3;
00349 }
00350 }
00351 break;
00352
00353 case 4:
00354 {
00355 Uint32* q = (Uint32*)p;
00356 for (;x1 <= x2; ++x1)
00357 {
00358 if (mAlpha)
00359 {
00360 *q = SDLAlpha32(pixel,*q,mColor.a);
00361 q++;
00362 }
00363 else
00364 {
00365 *(q++) = pixel;
00366 }
00367 }
00368 break;
00369 }
00370
00371 }
00372
00373 SDL_UnlockSurface(mTarget);
00374 }
00375
00376 void SDLGraphics::drawVLine(int x, int y1, int y2)
00377 {
00378 if (mClipStack.empty())
00379 {
00380 throw GCN_EXCEPTION("Clip stack is empty, perhaps you called a draw funtion outside of _beginDraw() and _endDraw()?");
00381 }
00382
00383 const ClipRectangle& top = mClipStack.top();
00384
00385 x += top.xOffset;
00386 y1 += top.yOffset;
00387 y2 += top.yOffset;
00388
00389 if (x < top.x || x >= top.x + top.width)
00390 {
00391 return;
00392 }
00393
00394 if (y1 > y2)
00395 {
00396 y1 ^= y2;
00397 y2 ^= y1;
00398 y1 ^= y2;
00399 }
00400
00401 if (top.y > y1)
00402 {
00403 if (top.y > y2)
00404 {
00405 return;
00406 }
00407
00408 y1 = top.y;
00409 }
00410
00411 if (top.y + top.height <= y2)
00412 {
00413 if (top.y + top.height <= y1)
00414 {
00415 return;
00416 }
00417
00418 y2 = top.y + top.height - 1;
00419 }
00420
00421 int bpp = mTarget->format->BytesPerPixel;
00422
00423 SDL_LockSurface(mTarget);
00424
00425 Uint8 *p = (Uint8 *)mTarget->pixels + y1 * mTarget->pitch + x * bpp;
00426
00427 Uint32 pixel = SDL_MapRGB(mTarget->format, mColor.r, mColor.g, mColor.b);
00428
00429 switch(bpp)
00430 {
00431 case 1:
00432 for (;y1 <= y2; ++y1)
00433 {
00434 *p = pixel;
00435 p += mTarget->pitch;
00436 }
00437 break;
00438
00439 case 2:
00440 for (;y1 <= y2; ++y1)
00441 {
00442 *(Uint16*)p = pixel;
00443 p += mTarget->pitch;
00444 }
00445 break;
00446
00447 case 3:
00448 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
00449 {
00450 for (;y1 <= y2; ++y1)
00451 {
00452 p[0] = (pixel >> 16) & 0xff;
00453 p[1] = (pixel >> 8) & 0xff;
00454 p[2] = pixel & 0xff;
00455 p += mTarget->pitch;
00456 }
00457 }
00458 else
00459 {
00460 for (;y1 <= y2; ++y1)
00461 {
00462 p[0] = pixel & 0xff;
00463 p[1] = (pixel >> 8) & 0xff;
00464 p[2] = (pixel >> 16) & 0xff;
00465 p += mTarget->pitch;
00466 }
00467 }
00468 break;
00469
00470 case 4:
00471 for (;y1 <= y2; ++y1)
00472 {
00473 if (mAlpha)
00474 {
00475 *(Uint32*)p = SDLAlpha32(pixel,*(Uint32*)p,mColor.a);
00476 }
00477 else
00478 {
00479 *(Uint32*)p = pixel;
00480 }
00481 p += mTarget->pitch;
00482 }
00483 break;
00484
00485 }
00486
00487 SDL_UnlockSurface(mTarget);
00488 }
00489
00490 void SDLGraphics::drawRectangle(const Rectangle& rectangle)
00491 {
00492 int x1 = rectangle.x;
00493 int x2 = rectangle.x + rectangle.width - 1;
00494 int y1 = rectangle.y;
00495 int y2 = rectangle.y + rectangle.height - 1;
00496
00497 drawHLine(x1, y1, x2);
00498 drawHLine(x1, y2, x2);
00499
00500 drawVLine(x1, y1, y2);
00501 drawVLine(x2, y1, y2);
00502 }
00503
00504 void SDLGraphics::drawLine(int x1, int y1, int x2, int y2)
00505 {
00506 if (x1 == x2)
00507 {
00508 drawVLine(x1, y1, y2);
00509 return;
00510 }
00511 if (y1 == y2)
00512 {
00513 drawHLine(x1, y1, x2);
00514 return;
00515 }
00516
00517 if (mClipStack.empty())
00518 {
00519 throw GCN_EXCEPTION("Clip stack is empty, perhaps you called a draw funtion outside of _beginDraw() and _endDraw()?");
00520 }
00521
00522 const ClipRectangle& top = mClipStack.top();
00523
00524 x1 += top.xOffset;
00525 y1 += top.yOffset;
00526 x2 += top.xOffset;
00527 y2 += top.yOffset;
00528
00529
00530
00531 int dx = ABS(x2 - x1);
00532 int dy = ABS(y2 - y1);
00533
00534 if (dx > dy)
00535 {
00536 if (x1 > x2)
00537 {
00538
00539 x1 ^= x2;
00540 x2 ^= x1;
00541 x1 ^= x2;
00542
00543
00544 y1 ^= y2;
00545 y2 ^= y1;
00546 y1 ^= y2;
00547 }
00548
00549 if (y1 < y2)
00550 {
00551 int y = y1;
00552 int p = 0;
00553
00554 for (int x = x1; x <= x2; x++)
00555 {
00556 if (top.isPointInRect(x, y))
00557 {
00558 if (mAlpha)
00559 {
00560 SDLputPixelAlpha(mTarget, x, y, mColor);
00561 }
00562 else
00563 {
00564 SDLputPixel(mTarget, x, y, mColor);
00565 }
00566 }
00567
00568 p += dy;
00569
00570 if (p * 2 >= dx)
00571 {
00572 y++;
00573 p -= dx;
00574 }
00575 }
00576 }
00577 else
00578 {
00579 int y = y1;
00580 int p = 0;
00581
00582 for (int x = x1; x <= x2; x++)
00583 {
00584 if (top.isPointInRect(x, y))
00585 {
00586 if (mAlpha)
00587 {
00588 SDLputPixelAlpha(mTarget, x, y, mColor);
00589 }
00590 else
00591 {
00592 SDLputPixel(mTarget, x, y, mColor);
00593 }
00594 }
00595
00596 p += dy;
00597
00598 if (p * 2 >= dx)
00599 {
00600 y--;
00601 p -= dx;
00602 }
00603 }
00604 }
00605 }
00606 else
00607 {
00608 if (y1 > y2)
00609 {
00610
00611 y1 ^= y2;
00612 y2 ^= y1;
00613 y1 ^= y2;
00614
00615
00616 x1 ^= x2;
00617 x2 ^= x1;
00618 x1 ^= x2;
00619 }
00620
00621 if (x1 < x2)
00622 {
00623 int x = x1;
00624 int p = 0;
00625
00626 for (int y = y1; y <= y2; y++)
00627 {
00628 if (top.isPointInRect(x, y))
00629 {
00630 if (mAlpha)
00631 {
00632 SDLputPixelAlpha(mTarget, x, y, mColor);
00633 }
00634 else
00635 {
00636 SDLputPixel(mTarget, x, y, mColor);
00637 }
00638 }
00639
00640 p += dx;
00641
00642 if (p * 2 >= dy)
00643 {
00644 x++;
00645 p -= dy;
00646 }
00647 }
00648 }
00649 else
00650 {
00651 int x = x1;
00652 int p = 0;
00653
00654 for (int y = y1; y <= y2; y++)
00655 {
00656 if (top.isPointInRect(x, y))
00657 {
00658 if (mAlpha)
00659 {
00660 SDLputPixelAlpha(mTarget, x, y, mColor);
00661 }
00662 else
00663 {
00664 SDLputPixel(mTarget, x, y, mColor);
00665 }
00666 }
00667
00668 p += dx;
00669
00670 if (p * 2 >= dy)
00671 {
00672 x--;
00673 p -= dy;
00674 }
00675 }
00676 }
00677 }
00678 }
00679
00680 void SDLGraphics::setColor(const Color& color)
00681 {
00682 mColor = color;
00683
00684 mAlpha = color.a != 255;
00685 }
00686
00687 const Color& SDLGraphics::getColor() const
00688 {
00689 return mColor;
00690 }
00691
00692 void SDLGraphics::drawSDLSurface(SDL_Surface* surface,
00693 SDL_Rect source,
00694 SDL_Rect destination)
00695 {
00696 if (mClipStack.empty())
00697 {
00698 throw GCN_EXCEPTION("Clip stack is empty, perhaps you called a draw funtion outside of _beginDraw() and _endDraw()?");
00699 }
00700
00701 const ClipRectangle& top = mClipStack.top();
00702
00703 destination.x += top.xOffset;
00704 destination.y += top.yOffset;
00705
00706 SDL_BlitSurface(surface, &source, mTarget, &destination);
00707 }
00708 }