gdiplus: Added linecap rendering for GdipDrawBezier.
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@ -32,6 +32,7 @@ WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
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/* looks-right constants */
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#define TENSION_CONST (0.3)
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#define ANCHOR_WIDTH (2.0)
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#define MAX_ITERS (50)
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static inline INT roundr(REAL x)
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{
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@ -317,6 +318,72 @@ static void draw_polyline(HDC hdc, GpPen *pen, GDIPCONST GpPointF * pt,
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GdipFree(pti);
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}
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/* Conducts a linear search to find the bezier points that will back off
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* the endpoint of the curve by a distance of amt. Linear search works
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* better than binary in this case because there are multiple solutions,
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* and binary searches often find a bad one. I don't think this is what
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* Windows does but short of rendering the bezier without GDI's help it's
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* the best we can do. */
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static void shorten_bezier_amt(GpPointF * pt, REAL amt)
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{
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GpPointF origpt[4];
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REAL percent = 0.00, dx, dy, origx = pt[3].X, origy = pt[3].Y, diff = -1.0;
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INT i;
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memcpy(origpt, pt, sizeof(GpPointF) * 4);
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for(i = 0; (i < MAX_ITERS) && (diff < amt); i++){
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/* reset bezier points to original values */
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memcpy(pt, origpt, sizeof(GpPointF) * 4);
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/* Perform magic on bezier points. Order is important here.*/
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shorten_line_percent(pt[2].X, pt[2].Y, &pt[3].X, &pt[3].Y, percent);
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shorten_line_percent(pt[1].X, pt[1].Y, &pt[2].X, &pt[2].Y, percent);
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shorten_line_percent(pt[2].X, pt[2].Y, &pt[3].X, &pt[3].Y, percent);
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shorten_line_percent(pt[0].X, pt[0].Y, &pt[1].X, &pt[1].Y, percent);
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shorten_line_percent(pt[1].X, pt[1].Y, &pt[2].X, &pt[2].Y, percent);
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shorten_line_percent(pt[2].X, pt[2].Y, &pt[3].X, &pt[3].Y, percent);
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dx = pt[3].X - origx;
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dy = pt[3].Y - origy;
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diff = sqrt(dx * dx + dy * dy);
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percent += 0.0005 * amt;
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}
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}
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/* Draws bezier curves between given points, and if caps is true then draws an
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* endcap at the end of the last line. FIXME: Startcaps not implemented. */
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static void draw_polybezier(HDC hdc, GpPen *pen, GDIPCONST GpPointF * pt,
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INT count, BOOL caps)
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{
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POINT *pti = GdipAlloc(count * sizeof(POINT));
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GpPointF *ptf = GdipAlloc(4 * sizeof(GpPointF));
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INT i;
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memcpy(ptf, &pt[count-4], 4 * sizeof(GpPointF));
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if(caps){
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if(pen->endcap == LineCapArrowAnchor)
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shorten_bezier_amt(ptf, pen->width);
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draw_cap(hdc, pen->color, pen->endcap, pen->width, ptf[3].X,
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ptf[3].Y, pt[count - 1].X, pt[count - 1].Y);
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}
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for(i = 0; i < count - 4; i ++){
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pti[i].x = roundr(pt[i].X);
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pti[i].y = roundr(pt[i].Y);
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}
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for(i = 0; i < 4; i ++){
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pti[i].x = roundr(ptf[i].X);
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pti[i].y = roundr(ptf[i].Y);
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}
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PolyBezier(hdc, pti, count);
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GdipFree(pti);
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GdipFree(ptf);
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}
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GpStatus WINGDIPAPI GdipCreateFromHDC(HDC hdc, GpGraphics **graphics)
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{
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if(hdc == NULL)
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@ -385,18 +452,28 @@ GpStatus WINGDIPAPI GdipDrawArc(GpGraphics *graphics, GpPen *pen, REAL x,
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GpStatus WINGDIPAPI GdipDrawBezier(GpGraphics *graphics, GpPen *pen, REAL x1,
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REAL y1, REAL x2, REAL y2, REAL x3, REAL y3, REAL x4, REAL y4)
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{
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HGDIOBJ old_pen;
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POINT pt[4] = {{roundr(x1), roundr(y1)}, {roundr(x2), roundr(y2)},
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{roundr(x3), roundr(y3)}, {roundr(x4), roundr(y4)}};
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INT save_state;
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GpPointF pt[4];
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if(!graphics || !pen)
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return InvalidParameter;
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old_pen = SelectObject(graphics->hdc, pen->gdipen);
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pt[0].X = x1;
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pt[0].Y = y1;
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pt[1].X = x2;
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pt[1].Y = y2;
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pt[2].X = x3;
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pt[2].Y = y3;
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pt[3].X = x4;
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pt[3].Y = y4;
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PolyBezier(graphics->hdc, pt, 4);
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save_state = SaveDC(graphics->hdc);
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EndPath(graphics->hdc);
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SelectObject(graphics->hdc, pen->gdipen);
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SelectObject(graphics->hdc, old_pen);
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draw_polybezier(graphics->hdc, pen, pt, 4, TRUE);
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RestoreDC(graphics->hdc, save_state);
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return Ok;
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}
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