dlls/gdiplus/graphics.c

   1 /*
   2  * Copyright (C) 2007 Google (Evan Stade)
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <stdarg.h>
  20 #include <math.h>
  21
  22 #include "windef.h"
  23 #include "winbase.h"
  24 #include "winuser.h"
  25 #include "wingdi.h"
  26 #include "gdiplus.h"
  27 #include "gdiplus_private.h"
  28 #include "wine/debug.h"
  29
  30 WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
  31
  32 /* looks-right constants */
  33 #define TENSION_CONST (0.3)
  34 #define ANCHOR_WIDTH (2.0)
  35 #define MAX_ITERS (50)
  36
  37 /* Converts angle (in degrees) to x/y coordinates */
  38 static void deg2xy(REAL angle, REAL x_0, REAL y_0, REAL *x, REAL *y)
  39 {
  40     REAL radAngle, hypotenuse;
  41
  42     radAngle = deg2rad(angle);
  43     hypotenuse = 50.0; /* arbitrary */
  44
  45     *x = x_0 + cos(radAngle) * hypotenuse;
  46     *y = y_0 + sin(radAngle) * hypotenuse;
  47 }
  48
  49 /* Converts from gdiplus path point type to gdi path point type. */
  50 static BYTE convert_path_point_type(BYTE type)
  51 {
  52     BYTE ret;
  53
  54     switch(type & PathPointTypePathTypeMask){
  55         case PathPointTypeBezier:
  56             ret = PT_BEZIERTO;
  57             break;
  58         case PathPointTypeLine:
  59             ret = PT_LINETO;
  60             break;
  61         case PathPointTypeStart:
  62             ret = PT_MOVETO;
  63             break;
  64         default:
  65             ERR("Bad point type\n");
  66             return 0;
  67     }
  68
  69     if(type & PathPointTypeCloseSubpath)
  70         ret |= PT_CLOSEFIGURE;
  71
  72     return ret;
  73 }
  74
  75 /* GdipDrawPie/GdipFillPie helper function */
  76 static GpStatus draw_pie(GpGraphics *graphics, HBRUSH gdibrush, HPEN gdipen,
  77     REAL x, REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
  78 {
  79     INT save_state;
  80     REAL x_0, y_0, x_1, y_1, x_2, y_2;
  81
  82     if(!graphics)
  83         return InvalidParameter;
  84
  85     save_state = SaveDC(graphics->hdc);
  86     EndPath(graphics->hdc);
  87     SelectObject(graphics->hdc, gdipen);
  88     SelectObject(graphics->hdc, gdibrush);
  89
  90     x_0 = x + (width/2.0);
  91     y_0 = y + (height/2.0);
  92
  93     deg2xy(startAngle+sweepAngle, x_0, y_0, &x_1, &y_1);
  94     deg2xy(startAngle, x_0, y_0, &x_2, &y_2);
  95
  96     Pie(graphics->hdc, roundr(x), roundr(y), roundr(x+width), roundr(y+height),
  97         roundr(x_1), roundr(y_1), roundr(x_2), roundr(y_2));
  98
  99     RestoreDC(graphics->hdc, save_state);
 100
 101     return Ok;
 102 }
 103
 104 /* GdipDrawCurve helper function.
 105  * Calculates Bezier points from cardinal spline points. */
 106 static void calc_curve_bezier(CONST GpPointF *pts, REAL tension, REAL *x1,
 107     REAL *y1, REAL *x2, REAL *y2)
 108 {
 109     REAL xdiff, ydiff;
 110
 111     /* calculate tangent */
 112     xdiff = pts[2].X - pts[0].X;
 113     ydiff = pts[2].Y - pts[0].Y;
 114
 115     /* apply tangent to get control points */
 116     *x1 = pts[1].X - tension * xdiff;
 117     *y1 = pts[1].Y - tension * ydiff;
 118     *x2 = pts[1].X + tension * xdiff;
 119     *y2 = pts[1].Y + tension * ydiff;
 120 }
 121
 122 /* GdipDrawCurve helper function.
 123  * Calculates Bezier points from cardinal spline endpoints. */
 124 static void calc_curve_bezier_endp(REAL xend, REAL yend, REAL xadj, REAL yadj,
 125     REAL tension, REAL *x, REAL *y)
 126 {
 127     /* tangent at endpoints is the line from the endpoint to the adjacent point */
 128     *x = roundr(tension * (xadj - xend) + xend);
 129     *y = roundr(tension * (yadj - yend) + yend);
 130 }
 131
 132 /* Draws the linecap the specified color and size on the hdc.  The linecap is in
 133  * direction of the line from x1, y1 to x2, y2 and is anchored on x2, y2. */
 134 static void draw_cap(HDC hdc, COLORREF color, GpLineCap cap, REAL size,
 135     const GpCustomLineCap *custom, REAL x1, REAL y1, REAL x2, REAL y2)
 136 {
 137     HGDIOBJ oldbrush, oldpen;
 138     GpMatrix *matrix = NULL;
 139     HBRUSH brush;
 140     HPEN pen;
 141     PointF *custptf = NULL;
 142     POINT pt[4], *custpt = NULL;
 143     BYTE *tp = NULL;
 144     REAL theta, dsmall, dbig, dx, dy;
 145     INT i, count;
 146     LOGBRUSH lb;
 147
 148     if(x2 != x1)
 149         theta = atan2(y2 - y1, x2 - x1);
 150     else if(y2 != y1){
 151         theta = M_PI_2 * (y2 > y1 ? 1.0 : -1.0);
 152     }
 153     else
 154         return;
 155
 156     brush = CreateSolidBrush(color);
 157     lb.lbStyle = BS_SOLID;
 158     lb.lbColor = color;
 159     lb.lbHatch = 0;
 160     pen = ExtCreatePen(PS_GEOMETRIC | PS_SOLID | PS_ENDCAP_FLAT,
 161                        (cap == LineCapCustom ? size : 1), &lb, 0, NULL);
 162     oldbrush = SelectObject(hdc, brush);
 163     oldpen = SelectObject(hdc, pen);
 164
 165     switch(cap){
 166         case LineCapFlat:
 167             break;
 168         case LineCapSquare:
 169         case LineCapSquareAnchor:
 170         case LineCapDiamondAnchor:
 171             size = size * (cap & LineCapNoAnchor ? ANCHOR_WIDTH : 1.0) / 2.0;
 172             if(cap == LineCapDiamondAnchor){
 173                 dsmall = cos(theta + M_PI_2) * size;
 174                 dbig = sin(theta + M_PI_2) * size;
 175             }
 176             else{
 177                 dsmall = cos(theta + M_PI_4) * size;
 178                 dbig = sin(theta + M_PI_4) * size;
 179             }
 180
 181             /* calculating the latter points from the earlier points makes them
 182              * look a little better because of rounding issues */
 183             pt[0].x = roundr(x2 - dsmall);
 184             pt[1].x = roundr(((REAL)pt[0].x) + dbig + dsmall);
 185
 186             pt[0].y = roundr(y2 - dbig);
 187             pt[3].y = roundr(((REAL)pt[0].y) + dsmall + dbig);
 188
 189             pt[1].y = roundr(y2 - dsmall);
 190             pt[2].y = roundr(dbig + dsmall + ((REAL)pt[1].y));
 191
 192             pt[3].x = roundr(x2 - dbig);
 193             pt[2].x = roundr(((REAL)pt[3].x) + dsmall + dbig);
 194
 195             Polygon(hdc, pt, 4);
 196
 197             break;
 198         case LineCapArrowAnchor:
 199             size = size * 4.0 / sqrt(3.0);
 200
 201             dx = cos(M_PI / 6.0 + theta) * size;
 202             dy = sin(M_PI / 6.0 + theta) * size;
 203
 204             pt[0].x = roundr(x2 - dx);
 205             pt[0].y = roundr(y2 - dy);
 206
 207             dx = cos(- M_PI / 6.0 + theta) * size;
 208             dy = sin(- M_PI / 6.0 + theta) * size;
 209
 210             pt[1].x = roundr(x2 - dx);
 211             pt[1].y = roundr(y2 - dy);
 212
 213             pt[2].x = roundr(x2);
 214             pt[2].y = roundr(y2);
 215
 216             Polygon(hdc, pt, 3);
 217
 218             break;
 219         case LineCapRoundAnchor:
 220             dx = dy = ANCHOR_WIDTH * size / 2.0;
 221
 222             x2 = (REAL) roundr(x2 - dx);
 223             y2 = (REAL) roundr(y2 - dy);
 224
 225             Ellipse(hdc, (INT) x2, (INT) y2, roundr(x2 + 2.0 * dx),
 226                 roundr(y2 + 2.0 * dy));
 227             break;
 228         case LineCapTriangle:
 229             size = size / 2.0;
 230             dx = cos(M_PI_2 + theta) * size;
 231             dy = sin(M_PI_2 + theta) * size;
 232
 233             /* Using roundr here can make the triangle float off the end of the
 234              * line. */
 235             pt[0].x = ((x2 - x1) >= 0 ? floorf(x2 - dx) : ceilf(x2 - dx));
 236             pt[0].y = ((y2 - y1) >= 0 ? floorf(y2 - dy) : ceilf(y2 - dy));
 237             pt[1].x = roundr(pt[0].x + 2.0 * dx);
 238             pt[1].y = roundr(pt[0].y + 2.0 * dy);
 239
 240             dx = cos(theta) * size;
 241             dy = sin(theta) * size;
 242
 243             pt[2].x = roundr(x2 + dx);
 244             pt[2].y = roundr(y2 + dy);
 245
 246             Polygon(hdc, pt, 3);
 247
 248             break;
 249         case LineCapRound:
 250             dx = -cos(M_PI_2 + theta) * size;
 251             dy = -sin(M_PI_2 + theta) * size;
 252
 253             pt[0].x = ((x2 - x1) >= 0 ? floorf(x2 - dx) : ceilf(x2 - dx));
 254             pt[0].y = ((y2 - y1) >= 0 ? floorf(y2 - dy) : ceilf(y2 - dy));
 255             pt[1].x = roundr(pt[0].x + 2.0 * dx);
 256             pt[1].y = roundr(pt[0].y + 2.0 * dy);
 257
 258             dx = dy = size / 2.0;
 259
 260             x2 = (REAL) roundr(x2 - dx);
 261             y2 = (REAL) roundr(y2 - dy);
 262
 263             Pie(hdc, (INT) x2, (INT) y2, roundr(x2 + 2.0 * dx),
 264                 roundr(y2 + 2.0 * dy), pt[0].x, pt[0].y, pt[1].x, pt[1].y);
 265             break;
 266         case LineCapCustom:
 267             if(!custom)
 268                 break;
 269
 270             if(custom->fill){
 271                 FIXME("fill-path custom line caps not implemented\n");
 272                 break;
 273             }
 274
 275             count = custom->pathdata.Count;
 276             custptf = GdipAlloc(count * sizeof(PointF));
 277             custpt = GdipAlloc(count * sizeof(POINT));
 278             tp = GdipAlloc(count);
 279
 280             if(!custptf || !custpt || !tp || (GdipCreateMatrix(&matrix) != Ok))
 281                 goto custend;
 282
 283             memcpy(custptf, custom->pathdata.Points, count * sizeof(PointF));
 284
 285             GdipScaleMatrix(matrix, size, size, MatrixOrderAppend);
 286             GdipRotateMatrix(matrix, (180.0 / M_PI) * (theta - M_PI_2),
 287                              MatrixOrderAppend);
 288             GdipTranslateMatrix(matrix, x2, y2, MatrixOrderAppend);
 289             GdipTransformMatrixPoints(matrix, custptf, count);
 290
 291             for(i = 0; i < count; i++){
 292                 custpt[i].x = roundr(custptf[i].X);
 293                 custpt[i].y = roundr(custptf[i].Y);
 294                 tp[i] = convert_path_point_type(custom->pathdata.Types[i]);
 295             }
 296
 297             PolyDraw(hdc, custpt, tp, count);
 298
 299 custend:
 300             GdipFree(custptf);
 301             GdipFree(custpt);
 302             GdipFree(tp);
 303             GdipDeleteMatrix(matrix);
 304             break;
 305         default:
 306             break;
 307     }
 308
 309     SelectObject(hdc, oldbrush);
 310     SelectObject(hdc, oldpen);
 311     DeleteObject(brush);
 312     DeleteObject(pen);
 313 }
 314
 315 /* Shortens the line by the given percent by changing x2, y2.
 316  * If percent is > 1.0 then the line will change direction. */
 317 static void shorten_line_percent(REAL x1, REAL  y1, REAL *x2, REAL *y2, REAL percent)
 318 {
 319     REAL dist, theta, dx, dy;
 320
 321     if((y1 == *y2) && (x1 == *x2))
 322         return;
 323
 324     dist = sqrt((*x2 - x1) * (*x2 - x1) + (*y2 - y1) * (*y2 - y1)) * percent;
 325     theta = (*x2 == x1 ? M_PI_2 : atan((*y2 - y1) / (*x2 - x1)));
 326     dx = cos(theta) * dist;
 327     dy = sin(theta) * dist;
 328
 329     *x2 = *x2 + fabs(dx) * (*x2 > x1 ? -1.0 : 1.0);
 330     *y2 = *y2 + fabs(dy) * (*y2 > y1 ? -1.0 : 1.0);
 331 }
 332
 333 /* Shortens the line by the given amount by changing x2, y2.
 334  * If the amount is greater than the distance, the line will become length 0. */
 335 static void shorten_line_amt(REAL x1, REAL y1, REAL *x2, REAL *y2, REAL amt)
 336 {
 337     REAL dx, dy, percent;
 338
 339     dx = *x2 - x1;
 340     dy = *y2 - y1;
 341     if(dx == 0 && dy == 0)
 342         return;
 343
 344     percent = amt / sqrt(dx * dx + dy * dy);
 345     if(percent >= 1.0){
 346         *x2 = x1;
 347         *y2 = y1;
 348         return;
 349     }
 350
 351     shorten_line_percent(x1, y1, x2, y2, percent);
 352 }
 353
 354 /* Draws lines between the given points, and if caps is true then draws an endcap
 355  * at the end of the last line.  FIXME: Startcaps not implemented. */
 356 static GpStatus draw_polyline(HDC hdc, GpPen *pen, GDIPCONST GpPointF * pt,
 357     INT count, BOOL caps)
 358 {
 359     POINT *pti;
 360     REAL x = pt[count - 1].X, y = pt[count - 1].Y;
 361     INT i;
 362     GpStatus status = GenericError;
 363
 364     if(!count)
 365         return Ok;
 366
 367     pti = GdipAlloc(count * sizeof(POINT));
 368
 369     if(!pti){
 370         status = OutOfMemory;
 371         goto end;
 372     }
 373
 374     if(caps){
 375         if(pen->endcap == LineCapArrowAnchor)
 376             shorten_line_amt(pt[count-2].X, pt[count-2].Y, &x, &y, pen->width);
 377
 378         draw_cap(hdc, pen->color, pen->endcap, pen->width, pen->customend,
 379                  pt[count-2].X, pt[count-2].Y, pt[count - 1].X, pt[count - 1].Y);
 380     }
 381
 382     for(i = 0; i < count - 1; i ++){
 383         pti[i].x = roundr(pt[i].X);
 384         pti[i].y = roundr(pt[i].Y);
 385     }
 386
 387     pti[i].x = roundr(x);
 388     pti[i].y = roundr(y);
 389
 390     Polyline(hdc, pti, count);
 391
 392 end:
 393     GdipFree(pti);
 394
 395     return status;
 396 }
 397
 398 /* Conducts a linear search to find the bezier points that will back off
 399  * the endpoint of the curve by a distance of amt. Linear search works
 400  * better than binary in this case because there are multiple solutions,
 401  * and binary searches often find a bad one. I don't think this is what
 402  * Windows does but short of rendering the bezier without GDI's help it's
 403  * the best we can do. */
 404 static void shorten_bezier_amt(GpPointF * pt, REAL amt)
 405 {
 406     GpPointF origpt[4];
 407     REAL percent = 0.00, dx, dy, origx = pt[3].X, origy = pt[3].Y, diff = -1.0;
 408     INT i;
 409
 410     memcpy(origpt, pt, sizeof(GpPointF) * 4);
 411
 412     for(i = 0; (i < MAX_ITERS) && (diff < amt); i++){
 413         /* reset bezier points to original values */
 414         memcpy(pt, origpt, sizeof(GpPointF) * 4);
 415         /* Perform magic on bezier points. Order is important here.*/
 416         shorten_line_percent(pt[2].X, pt[2].Y, &pt[3].X, &pt[3].Y, percent);
 417         shorten_line_percent(pt[1].X, pt[1].Y, &pt[2].X, &pt[2].Y, percent);
 418         shorten_line_percent(pt[2].X, pt[2].Y, &pt[3].X, &pt[3].Y, percent);
 419         shorten_line_percent(pt[0].X, pt[0].Y, &pt[1].X, &pt[1].Y, percent);
 420         shorten_line_percent(pt[1].X, pt[1].Y, &pt[2].X, &pt[2].Y, percent);
 421         shorten_line_percent(pt[2].X, pt[2].Y, &pt[3].X, &pt[3].Y, percent);
 422
 423         dx = pt[3].X - origx;
 424         dy = pt[3].Y - origy;
 425
 426         diff = sqrt(dx * dx + dy * dy);
 427         percent += 0.0005 * amt;
 428     }
 429 }
 430
 431 /* Draws bezier curves between given points, and if caps is true then draws an
 432  * endcap at the end of the last line.  FIXME: Startcaps not implemented. */
 433 static GpStatus draw_polybezier(HDC hdc, GpPen *pen, GDIPCONST GpPointF * pt,
 434     INT count, BOOL caps)
 435 {
 436     POINT *pti;
 437     GpPointF *ptf;
 438     INT i;
 439     GpStatus status = GenericError;
 440
 441     if(!count)
 442         return Ok;
 443
 444     pti = GdipAlloc(count * sizeof(POINT));
 445     ptf = GdipAlloc(4 * sizeof(GpPointF));
 446
 447     if(!pti || !ptf){
 448         status = OutOfMemory;
 449         goto end;
 450     }
 451
 452     memcpy(ptf, &pt[count-4], 4 * sizeof(GpPointF));
 453
 454     if(caps){
 455         if(pen->endcap == LineCapArrowAnchor)
 456             shorten_bezier_amt(ptf, pen->width);
 457
 458         /* the direction of the line cap is parallel to the direction at the
 459          * end of the bezier (which, if it has been shortened, is not the same
 460          * as the direction from pt[count-2] to pt[count-1]) */
 461         draw_cap(hdc, pen->color, pen->endcap, pen->width, pen->customend,
 462             pt[count - 1].X - (ptf[3].X - ptf[2].X),
 463             pt[count - 1].Y - (ptf[3].Y - ptf[2].Y),
 464             pt[count - 1].X, pt[count - 1].Y);
 465     }
 466
 467     for(i = 0; i < count - 4; i ++){
 468         pti[i].x = roundr(pt[i].X);
 469         pti[i].y = roundr(pt[i].Y);
 470     }
 471     for(i = 0; i < 4; i ++){
 472         pti[i + count - 4].x = roundr(ptf[i].X);
 473         pti[i + count - 4].y = roundr(ptf[i].Y);
 474     }
 475
 476     PolyBezier(hdc, pti, count);
 477
 478     status = Ok;
 479
 480 end:
 481     GdipFree(pti);
 482     GdipFree(ptf);
 483
 484     return status;
 485 }
 486
 487 /* Draws a combination of bezier curves and lines between points. */
 488 static GpStatus draw_poly(HDC hdc, GpPen *pen, GDIPCONST GpPointF * pt,
 489     GDIPCONST BYTE * types, INT count, BOOL caps)
 490 {
 491     POINT *pti = GdipAlloc(count * sizeof(POINT));
 492     BYTE *tp = GdipAlloc(count);
 493     GpPointF *ptf = NULL;
 494     REAL x = pt[count - 1].X, y = pt[count - 1].Y;
 495     INT i;
 496     GpStatus status = GenericError;
 497
 498     if(!count){
 499         status = Ok;
 500         goto end;
 501     }
 502     if(!pti || !tp){
 503         status = OutOfMemory;
 504         goto end;
 505     }
 506
 507     for(i = 0; i < count; i++){
 508         if((types[i] & PathPointTypePathTypeMask) == PathPointTypeBezier){
 509             if((i + 2 >= count) || !(types[i + 1] & PathPointTypeBezier)
 510                 || !(types[i + 1] & PathPointTypeBezier)){
 511                 ERR("Bad bezier points\n");
 512                 goto end;
 513             }
 514             i += 2;
 515         }
 516     }
 517
 518     for(i = 0; i < count; i++){
 519         pti[i].x = roundr(pt[i].X);
 520         pti[i].y = roundr(pt[i].Y);
 521     }
 522
 523     /* If we are drawing caps, go through the points and adjust them accordingly,
 524      * and draw the caps. */
 525     if(caps){
 526         switch(types[count - 1] & PathPointTypePathTypeMask){
 527             case PathPointTypeBezier:
 528                 ptf = GdipAlloc(4 * sizeof(GpPointF));
 529                 if(!ptf){
 530                     status = OutOfMemory;
 531                     goto end;
 532                 }
 533                 memcpy(ptf, &pt[count - 4], 4 * sizeof(GpPointF));
 534
 535                 if(pen->endcap == LineCapArrowAnchor)
 536                     shorten_bezier_amt(ptf, pen->width);
 537
 538                 draw_cap(hdc, pen->color, pen->endcap, pen->width, pen->customend,
 539                     pt[count - 1].X - (ptf[3].X - ptf[2].X),
 540                     pt[count - 1].Y - (ptf[3].Y - ptf[2].Y),
 541                     pt[count - 1].X, pt[count - 1].Y);
 542
 543                 for(i = 0; i < 4; i++){
 544                     pti[i + count - 4].x = roundr(ptf[i].X);
 545                     pti[i + count - 4].y = roundr(ptf[i].Y);
 546                 }
 547
 548                 break;
 549
 550             case PathPointTypeLine:
 551                 if(pen->endcap == LineCapArrowAnchor)
 552                     shorten_line_amt(pt[count - 2].X, pt[count - 2].Y, &x, &y,
 553                                      pen->width);
 554
 555                 draw_cap(hdc, pen->color, pen->endcap, pen->width, pen->customend,
 556                          pt[count - 2].X, pt[count - 2].Y, pt[count - 1].X,
 557                          pt[count - 1].Y);
 558
 559                 pti[count - 1].x = roundr(x);
 560                 pti[count - 1].y = roundr(y);
 561
 562                 break;
 563             default:
 564                 ERR("Bad path last point\n");
 565                 goto end;
 566         }
 567     }
 568
 569     for(i = 0; i < count; i++){
 570         tp[i] = convert_path_point_type(types[i]);
 571     }
 572
 573     PolyDraw(hdc, pti, tp, count);
 574
 575     status = Ok;
 576
 577 end:
 578     GdipFree(pti);
 579     GdipFree(ptf);
 580     GdipFree(tp);
 581
 582     return status;
 583 }
 584
 585 GpStatus WINGDIPAPI GdipCreateFromHDC(HDC hdc, GpGraphics **graphics)
 586 {
 587     if(hdc == NULL)
 588         return OutOfMemory;
 589
 590     if(graphics == NULL)
 591         return InvalidParameter;
 592
 593     *graphics = GdipAlloc(sizeof(GpGraphics));
 594     if(!*graphics)  return OutOfMemory;
 595
 596     (*graphics)->hdc = hdc;
 597     (*graphics)->hwnd = NULL;
 598     (*graphics)->smoothing = SmoothingModeDefault;
 599     (*graphics)->compqual = CompositingQualityDefault;
 600     (*graphics)->interpolation = InterpolationModeDefault;
 601     (*graphics)->pixeloffset = PixelOffsetModeDefault;
 602
 603     return Ok;
 604 }
 605
 606 GpStatus WINGDIPAPI GdipCreateFromHWND(HWND hwnd, GpGraphics **graphics)
 607 {
 608     GpStatus ret;
 609
 610     if((ret = GdipCreateFromHDC(GetDC(hwnd), graphics)) != Ok)
 611         return ret;
 612
 613     (*graphics)->hwnd = hwnd;
 614
 615     return Ok;
 616 }
 617
 618 GpStatus WINGDIPAPI GdipDeleteGraphics(GpGraphics *graphics)
 619 {
 620     if(!graphics) return InvalidParameter;
 621     if(graphics->hwnd)
 622         ReleaseDC(graphics->hwnd, graphics->hdc);
 623
 624     HeapFree(GetProcessHeap(), 0, graphics);
 625
 626     return Ok;
 627 }
 628
 629 GpStatus WINGDIPAPI GdipDrawArc(GpGraphics *graphics, GpPen *pen, REAL x,
 630     REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
 631 {
 632     INT save_state, num_pts;
 633     GpPointF points[MAX_ARC_PTS];
 634     GpStatus retval;
 635
 636     if(!graphics || !pen)
 637         return InvalidParameter;
 638
 639     num_pts = arc2polybezier(points, x, y, width, height, startAngle, sweepAngle);
 640
 641     save_state = SaveDC(graphics->hdc);
 642     EndPath(graphics->hdc);
 643     SelectObject(graphics->hdc, pen->gdipen);
 644
 645     retval = draw_polybezier(graphics->hdc, pen, points, num_pts, TRUE);
 646
 647     RestoreDC(graphics->hdc, save_state);
 648
 649     return retval;
 650 }
 651
 652 GpStatus WINGDIPAPI GdipDrawBezier(GpGraphics *graphics, GpPen *pen, REAL x1,
 653     REAL y1, REAL x2, REAL y2, REAL x3, REAL y3, REAL x4, REAL y4)
 654 {
 655     INT save_state;
 656     GpPointF pt[4];
 657     GpStatus retval;
 658
 659     if(!graphics || !pen)
 660         return InvalidParameter;
 661
 662     pt[0].X = x1;
 663     pt[0].Y = y1;
 664     pt[1].X = x2;
 665     pt[1].Y = y2;
 666     pt[2].X = x3;
 667     pt[2].Y = y3;
 668     pt[3].X = x4;
 669     pt[3].Y = y4;
 670
 671     save_state = SaveDC(graphics->hdc);
 672     EndPath(graphics->hdc);
 673     SelectObject(graphics->hdc, pen->gdipen);
 674
 675     retval = draw_polybezier(graphics->hdc, pen, pt, 4, TRUE);
 676
 677     RestoreDC(graphics->hdc, save_state);
 678
 679     return retval;
 680 }
 681
 682 /* Approximates cardinal spline with Bezier curves. */
 683 GpStatus WINGDIPAPI GdipDrawCurve2(GpGraphics *graphics, GpPen *pen,
 684     GDIPCONST GpPointF *points, INT count, REAL tension)
 685 {
 686     /* PolyBezier expects count*3-2 points. */
 687     INT i, len_pt = count*3-2, save_state;
 688     GpPointF *pt;
 689     REAL x1, x2, y1, y2;
 690     GpStatus retval;
 691
 692     if(!graphics || !pen)
 693         return InvalidParameter;
 694
 695     pt = GdipAlloc(len_pt * sizeof(GpPointF));
 696     tension = tension * TENSION_CONST;
 697
 698     calc_curve_bezier_endp(points[0].X, points[0].Y, points[1].X, points[1].Y,
 699         tension, &x1, &y1);
 700
 701     pt[0].X = points[0].X;
 702     pt[0].Y = points[0].Y;
 703     pt[1].X = x1;
 704     pt[1].Y = y1;
 705
 706     for(i = 0; i < count-2; i++){
 707         calc_curve_bezier(&(points[i]), tension, &x1, &y1, &x2, &y2);
 708
 709         pt[3*i+2].X = x1;
 710         pt[3*i+2].Y = y1;
 711         pt[3*i+3].X = points[i+1].X;
 712         pt[3*i+3].Y = points[i+1].Y;
 713         pt[3*i+4].X = x2;
 714         pt[3*i+4].Y = y2;
 715     }
 716
 717     calc_curve_bezier_endp(points[count-1].X, points[count-1].Y,
 718         points[count-2].X, points[count-2].Y, tension, &x1, &y1);
 719
 720     pt[len_pt-2].X = x1;
 721     pt[len_pt-2].Y = y1;
 722     pt[len_pt-1].X = points[count-1].X;
 723     pt[len_pt-1].Y = points[count-1].Y;
 724
 725     save_state = SaveDC(graphics->hdc);
 726     EndPath(graphics->hdc);
 727     SelectObject(graphics->hdc, pen->gdipen);
 728
 729     retval = draw_polybezier(graphics->hdc, pen, pt, len_pt, TRUE);
 730
 731     GdipFree(pt);
 732     RestoreDC(graphics->hdc, save_state);
 733
 734     return retval;
 735 }
 736
 737 GpStatus WINGDIPAPI GdipDrawLineI(GpGraphics *graphics, GpPen *pen, INT x1,
 738     INT y1, INT x2, INT y2)
 739 {
 740     INT save_state;
 741     GpPointF pt[2];
 742     GpStatus retval;
 743
 744     if(!pen || !graphics)
 745         return InvalidParameter;
 746
 747     pt[0].X = (REAL)x1;
 748     pt[0].Y = (REAL)y1;
 749     pt[1].X = (REAL)x2;
 750     pt[1].Y = (REAL)y2;
 751
 752     save_state = SaveDC(graphics->hdc);
 753     EndPath(graphics->hdc);
 754     SelectObject(graphics->hdc, pen->gdipen);
 755
 756     retval = draw_polyline(graphics->hdc, pen, pt, 2, TRUE);
 757
 758     RestoreDC(graphics->hdc, save_state);
 759
 760     return retval;
 761 }
 762
 763 GpStatus WINGDIPAPI GdipDrawLines(GpGraphics *graphics, GpPen *pen, GDIPCONST
 764     GpPointF *points, INT count)
 765 {
 766     INT save_state;
 767     GpStatus retval;
 768
 769     if(!pen || !graphics || (count < 2))
 770         return InvalidParameter;
 771
 772     save_state = SaveDC(graphics->hdc);
 773     EndPath(graphics->hdc);
 774     SelectObject(graphics->hdc, pen->gdipen);
 775
 776     retval = draw_polyline(graphics->hdc, pen, points, count, TRUE);
 777
 778     RestoreDC(graphics->hdc, save_state);
 779
 780     return retval;
 781 }
 782
 783 GpStatus WINGDIPAPI GdipDrawPath(GpGraphics *graphics, GpPen *pen, GpPath *path)
 784 {
 785     INT save_state;
 786     GpStatus retval;
 787
 788     if(!pen || !graphics)
 789         return InvalidParameter;
 790
 791     save_state = SaveDC(graphics->hdc);
 792     EndPath(graphics->hdc);
 793     SelectObject(graphics->hdc, pen->gdipen);
 794
 795     retval = draw_poly(graphics->hdc, pen, path->pathdata.Points,
 796                        path->pathdata.Types, path->pathdata.Count, TRUE);
 797
 798     RestoreDC(graphics->hdc, save_state);
 799
 800     return retval;
 801 }
 802
 803 GpStatus WINGDIPAPI GdipDrawPie(GpGraphics *graphics, GpPen *pen, REAL x,
 804     REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
 805 {
 806     if(!pen)
 807         return InvalidParameter;
 808
 809     return draw_pie(graphics, GetStockObject(NULL_BRUSH), pen->gdipen, x, y,
 810         width, height, startAngle, sweepAngle);
 811 }
 812
 813 GpStatus WINGDIPAPI GdipDrawRectangleI(GpGraphics *graphics, GpPen *pen, INT x,
 814     INT y, INT width, INT height)
 815 {
 816     INT save_state;
 817
 818     if(!pen || !graphics)
 819         return InvalidParameter;
 820
 821     save_state = SaveDC(graphics->hdc);
 822     EndPath(graphics->hdc);
 823     SelectObject(graphics->hdc, pen->gdipen);
 824     SelectObject(graphics->hdc, GetStockObject(NULL_BRUSH));
 825
 826     Rectangle(graphics->hdc, x, y, x + width, y + height);
 827
 828     RestoreDC(graphics->hdc, save_state);
 829
 830     return Ok;
 831 }
 832
 833 GpStatus WINGDIPAPI GdipFillPath(GpGraphics *graphics, GpBrush *brush, GpPath *path)
 834 {
 835     INT save_state;
 836     GpStatus retval;
 837
 838     if(!brush || !graphics || !path)
 839         return InvalidParameter;
 840
 841     save_state = SaveDC(graphics->hdc);
 842     EndPath(graphics->hdc);
 843     SelectObject(graphics->hdc, brush->gdibrush);
 844     SetPolyFillMode(graphics->hdc, (path->fill == FillModeAlternate ? ALTERNATE
 845                                                                     : WINDING));
 846
 847     BeginPath(graphics->hdc);
 848     retval = draw_poly(graphics->hdc, NULL, path->pathdata.Points,
 849                        path->pathdata.Types, path->pathdata.Count, FALSE);
 850
 851     if(retval != Ok)
 852         goto end;
 853
 854     EndPath(graphics->hdc);
 855     FillPath(graphics->hdc);
 856
 857     retval = Ok;
 858
 859 end:
 860     RestoreDC(graphics->hdc, save_state);
 861
 862     return retval;
 863 }
 864
 865 GpStatus WINGDIPAPI GdipFillPie(GpGraphics *graphics, GpBrush *brush, REAL x,
 866     REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
 867 {
 868     if(!brush)
 869         return InvalidParameter;
 870
 871     return draw_pie(graphics, brush->gdibrush, GetStockObject(NULL_PEN), x, y,
 872         width, height, startAngle, sweepAngle);
 873 }
 874
 875 /* FIXME: Compositing quality is not used anywhere except the getter/setter. */
 876 GpStatus WINGDIPAPI GdipGetCompositingQuality(GpGraphics *graphics,
 877     CompositingQuality *quality)
 878 {
 879     if(!graphics || !quality)
 880         return InvalidParameter;
 881
 882     *quality = graphics->compqual;
 883
 884     return Ok;
 885 }
 886
 887 /* FIXME: Interpolation mode is not used anywhere except the getter/setter. */
 888 GpStatus WINGDIPAPI GdipGetInterpolationMode(GpGraphics *graphics,
 889     InterpolationMode *mode)
 890 {
 891     if(!graphics || !mode)
 892         return InvalidParameter;
 893
 894     *mode = graphics->interpolation;
 895
 896     return Ok;
 897 }
 898
 899 /* FIXME: Pixel offset mode is not used anywhere except the getter/setter. */
 900 GpStatus WINGDIPAPI GdipGetPixelOffsetMode(GpGraphics *graphics, PixelOffsetMode
 901     *mode)
 902 {
 903     if(!graphics || !mode)
 904         return InvalidParameter;
 905
 906     *mode = graphics->pixeloffset;
 907
 908     return Ok;
 909 }
 910
 911 /* FIXME: Smoothing mode is not used anywhere except the getter/setter. */
 912 GpStatus WINGDIPAPI GdipGetSmoothingMode(GpGraphics *graphics, SmoothingMode *mode)
 913 {
 914     if(!graphics || !mode)
 915         return InvalidParameter;
 916
 917     *mode = graphics->smoothing;
 918
 919     return Ok;
 920 }
 921
 922 GpStatus WINGDIPAPI GdipRestoreGraphics(GpGraphics *graphics, GraphicsState state)
 923 {
 924     if(!graphics)
 925         return InvalidParameter;
 926
 927     FIXME("graphics state not implemented\n");
 928
 929     return NotImplemented;
 930 }
 931
 932 GpStatus WINGDIPAPI GdipSaveGraphics(GpGraphics *graphics, GraphicsState *state)
 933 {
 934     if(!graphics || !state)
 935         return InvalidParameter;
 936
 937     FIXME("graphics state not implemented\n");
 938
 939     return NotImplemented;
 940 }
 941
 942 GpStatus WINGDIPAPI GdipSetCompositingQuality(GpGraphics *graphics,
 943     CompositingQuality quality)
 944 {
 945     if(!graphics)
 946         return InvalidParameter;
 947
 948     graphics->compqual = quality;
 949
 950     return Ok;
 951 }
 952
 953 GpStatus WINGDIPAPI GdipSetInterpolationMode(GpGraphics *graphics,
 954     InterpolationMode mode)
 955 {
 956     if(!graphics)
 957         return InvalidParameter;
 958
 959     graphics->interpolation = mode;
 960
 961     return Ok;
 962 }
 963
 964 GpStatus WINGDIPAPI GdipSetPixelOffsetMode(GpGraphics *graphics, PixelOffsetMode
 965     mode)
 966 {
 967     if(!graphics)
 968         return InvalidParameter;
 969
 970     graphics->pixeloffset = mode;
 971
 972     return Ok;
 973 }
 974
 975 GpStatus WINGDIPAPI GdipSetSmoothingMode(GpGraphics *graphics, SmoothingMode mode)
 976 {
 977     if(!graphics)
 978         return InvalidParameter;
 979
 980     graphics->smoothing = mode;
 981
 982     return Ok;
 983 }