621 lines
18 KiB
C
621 lines
18 KiB
C
/*
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* Copyright (C) 2007 Google (Evan Stade)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <stdarg.h>
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#include <math.h>
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#include "windef.h"
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#include "winbase.h"
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#include "winuser.h"
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#include "wingdi.h"
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#include "gdiplus.h"
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#include "gdiplus_private.h"
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#include "wine/debug.h"
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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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return (INT) floor(x+0.5);
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}
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static inline REAL deg2rad(REAL degrees)
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{
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return (M_PI*2.0) * degrees / 360.0;
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}
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/* Converts angle (in degrees) to x/y coordinates */
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static void deg2xy(REAL angle, REAL x_0, REAL y_0, REAL *x, REAL *y)
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{
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REAL radAngle, hypotenuse;
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radAngle = deg2rad(angle);
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hypotenuse = 50.0; /* arbitrary */
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*x = x_0 + cos(radAngle) * hypotenuse;
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*y = y_0 + sin(radAngle) * hypotenuse;
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}
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/* GdipDrawPie/GdipFillPie helper function */
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static GpStatus draw_pie(GpGraphics *graphics, HBRUSH gdibrush, HPEN gdipen,
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REAL x, REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
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{
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INT save_state;
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REAL x_0, y_0, x_1, y_1, x_2, y_2;
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if(!graphics)
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return InvalidParameter;
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save_state = SaveDC(graphics->hdc);
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EndPath(graphics->hdc);
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SelectObject(graphics->hdc, gdipen);
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SelectObject(graphics->hdc, gdibrush);
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x_0 = x + (width/2.0);
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y_0 = y + (height/2.0);
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deg2xy(startAngle+sweepAngle, x_0, y_0, &x_1, &y_1);
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deg2xy(startAngle, x_0, y_0, &x_2, &y_2);
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Pie(graphics->hdc, roundr(x), roundr(y), roundr(x+width), roundr(y+height),
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roundr(x_1), roundr(y_1), roundr(x_2), roundr(y_2));
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RestoreDC(graphics->hdc, save_state);
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return Ok;
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}
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/* GdipDrawCurve helper function.
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* Calculates Bezier points from cardinal spline points. */
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static void calc_curve_bezier(CONST GpPointF *pts, REAL tension, REAL *x1,
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REAL *y1, REAL *x2, REAL *y2)
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{
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REAL xdiff, ydiff;
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/* calculate tangent */
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xdiff = pts[2].X - pts[0].X;
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ydiff = pts[2].Y - pts[0].Y;
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/* apply tangent to get control points */
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*x1 = pts[1].X - tension * xdiff;
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*y1 = pts[1].Y - tension * ydiff;
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*x2 = pts[1].X + tension * xdiff;
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*y2 = pts[1].Y + tension * ydiff;
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}
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/* GdipDrawCurve helper function.
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* Calculates Bezier points from cardinal spline endpoints. */
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static void calc_curve_bezier_endp(REAL xend, REAL yend, REAL xadj, REAL yadj,
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REAL tension, REAL *x, REAL *y)
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{
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/* tangent at endpoints is the line from the endpoint to the adjacent point */
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*x = roundr(tension * (xadj - xend) + xend);
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*y = roundr(tension * (yadj - yend) + yend);
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}
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/* Draws the linecap the specified color and size on the hdc. The linecap is in
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* direction of the line from x1, y1 to x2, y2 and is anchored on x2, y2. */
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static void draw_cap(HDC hdc, COLORREF color, GpLineCap cap, REAL size,
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REAL x1, REAL y1, REAL x2, REAL y2)
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{
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HGDIOBJ oldbrush, oldpen;
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HBRUSH brush;
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HPEN pen;
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POINT pt[4];
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REAL theta, dsmall, dbig, dx, dy, invert;
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if(x2 != x1)
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theta = atan((y2 - y1) / (x2 - x1));
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else if(y2 != y1){
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theta = M_PI_2 * (y2 > y1 ? 1.0 : -1.0);
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}
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else
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return;
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invert = ((x2 - x1) >= 0.0 ? 1.0 : -1.0);
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brush = CreateSolidBrush(color);
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pen = CreatePen(PS_SOLID, 1, color);
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oldbrush = SelectObject(hdc, brush);
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oldpen = SelectObject(hdc, pen);
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switch(cap){
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case LineCapFlat:
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break;
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case LineCapSquare:
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case LineCapSquareAnchor:
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case LineCapDiamondAnchor:
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size = size * (cap & LineCapNoAnchor ? ANCHOR_WIDTH : 1.0) / 2.0;
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if(cap == LineCapDiamondAnchor){
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dsmall = cos(theta + M_PI_2) * size;
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dbig = sin(theta + M_PI_2) * size;
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}
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else{
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dsmall = cos(theta + M_PI_4) * size;
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dbig = sin(theta + M_PI_4) * size;
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}
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/* calculating the latter points from the earlier points makes them
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* look a little better because of rounding issues */
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pt[0].x = roundr(x2 - dsmall);
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pt[1].x = roundr(((REAL)pt[0].x) + dbig + dsmall);
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pt[0].y = roundr(y2 - dbig);
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pt[3].y = roundr(((REAL)pt[0].y) + dsmall + dbig);
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pt[1].y = roundr(y2 - dsmall);
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pt[2].y = roundr(dbig + dsmall + ((REAL)pt[1].y));
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pt[3].x = roundr(x2 - dbig);
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pt[2].x = roundr(((REAL)pt[3].x) + dsmall + dbig);
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Polygon(hdc, pt, 4);
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break;
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case LineCapArrowAnchor:
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size = size * 4.0 / sqrt(3.0);
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dx = cos(M_PI / 6.0 + theta) * size * invert;
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dy = sin(M_PI / 6.0 + theta) * size * invert;
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pt[0].x = roundr(x2 - dx);
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pt[0].y = roundr(y2 - dy);
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dx = cos(- M_PI / 6.0 + theta) * size * invert;
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dy = sin(- M_PI / 6.0 + theta) * size * invert;
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pt[1].x = roundr(x2 - dx);
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pt[1].y = roundr(y2 - dy);
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pt[2].x = roundr(x2);
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pt[2].y = roundr(y2);
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Polygon(hdc, pt, 3);
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break;
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case LineCapRoundAnchor:
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dx = dy = ANCHOR_WIDTH * size / 2.0;
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x2 = (REAL) roundr(x2 - dx);
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y2 = (REAL) roundr(y2 - dy);
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Ellipse(hdc, (INT) x2, (INT) y2, roundr(x2 + 2.0 * dx),
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roundr(y2 + 2.0 * dy));
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break;
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case LineCapTriangle:
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size = size / 2.0;
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dx = cos(M_PI_2 + theta) * size;
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dy = sin(M_PI_2 + theta) * size;
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/* Using roundr here can make the triangle float off the end of the
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* line. */
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pt[0].x = ((x2 - x1) >= 0 ? floorf(x2 - dx) : ceilf(x2 - dx));
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pt[0].y = ((y2 - y1) >= 0 ? floorf(y2 - dy) : ceilf(y2 - dy));
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pt[1].x = roundr(pt[0].x + 2.0 * dx);
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pt[1].y = roundr(pt[0].y + 2.0 * dy);
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dx = cos(theta) * size * invert;
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dy = sin(theta) * size * invert;
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pt[2].x = roundr(x2 + dx);
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pt[2].y = roundr(y2 + dy);
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Polygon(hdc, pt, 3);
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break;
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case LineCapRound:
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dx = -cos(M_PI_2 + theta) * size * invert;
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dy = -sin(M_PI_2 + theta) * size * invert;
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pt[0].x = ((x2 - x1) >= 0 ? floorf(x2 - dx) : ceilf(x2 - dx));
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pt[0].y = ((y2 - y1) >= 0 ? floorf(y2 - dy) : ceilf(y2 - dy));
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pt[1].x = roundr(pt[0].x + 2.0 * dx);
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pt[1].y = roundr(pt[0].y + 2.0 * dy);
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dx = dy = size / 2.0;
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x2 = (REAL) roundr(x2 - dx);
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y2 = (REAL) roundr(y2 - dy);
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Pie(hdc, (INT) x2, (INT) y2, roundr(x2 + 2.0 * dx),
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roundr(y2 + 2.0 * dy), pt[0].x, pt[0].y, pt[1].x, pt[1].y);
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break;
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case LineCapCustom:
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FIXME("line cap not implemented\n");
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default:
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break;
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}
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SelectObject(hdc, oldbrush);
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SelectObject(hdc, oldpen);
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DeleteObject(brush);
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DeleteObject(pen);
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}
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/* Shortens the line by the given percent by changing x2, y2.
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* If percent is > 1.0 then the line will change direction. */
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static void shorten_line_percent(REAL x1, REAL y1, REAL *x2, REAL *y2, REAL percent)
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{
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REAL dist, theta, dx, dy;
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if((y1 == *y2) && (x1 == *x2))
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return;
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dist = sqrt((*x2 - x1) * (*x2 - x1) + (*y2 - y1) * (*y2 - y1)) * percent;
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theta = (*x2 == x1 ? M_PI_2 : atan((*y2 - y1) / (*x2 - x1)));
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dx = cos(theta) * dist;
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dy = sin(theta) * dist;
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*x2 = *x2 + fabs(dx) * (*x2 > x1 ? -1.0 : 1.0);
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*y2 = *y2 + fabs(dy) * (*y2 > y1 ? -1.0 : 1.0);
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}
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/* Shortens the line by the given amount by changing x2, y2.
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* If the amount is greater than the distance, the line will become length 0. */
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static void shorten_line_amt(REAL x1, REAL y1, REAL *x2, REAL *y2, REAL amt)
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{
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REAL dx, dy, percent;
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dx = *x2 - x1;
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dy = *y2 - y1;
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if(dx == 0 && dy == 0)
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return;
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percent = amt / sqrt(dx * dx + dy * dy);
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if(percent >= 1.0){
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*x2 = x1;
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*y2 = y1;
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return;
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}
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shorten_line_percent(x1, y1, x2, y2, percent);
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}
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/* Draws lines between the given points, and if caps is true then draws an endcap
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* at the end of the last line. FIXME: Startcaps not implemented. */
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static void draw_polyline(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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REAL x = pt[count - 1].X, y = pt[count - 1].Y;
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INT i;
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if(caps){
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if(pen->endcap == LineCapArrowAnchor)
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shorten_line_amt(pt[count-2].X, pt[count-2].Y, &x, &y, pen->width);
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draw_cap(hdc, pen->color, pen->endcap, pen->width, pt[count-2].X,
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pt[count-2].Y, pt[count - 1].X, pt[count - 1].Y);
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}
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for(i = 0; i < count - 1; 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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pti[i].x = roundr(x);
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pti[i].y = roundr(y);
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Polyline(hdc, pti, count);
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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 + count - 4].x = roundr(ptf[i].X);
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pti[i + count - 4].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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return OutOfMemory;
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if(graphics == NULL)
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return InvalidParameter;
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*graphics = GdipAlloc(sizeof(GpGraphics));
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if(!*graphics) return OutOfMemory;
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(*graphics)->hdc = hdc;
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(*graphics)->hwnd = NULL;
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return Ok;
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}
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GpStatus WINGDIPAPI GdipCreateFromHWND(HWND hwnd, GpGraphics **graphics)
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{
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GpStatus ret;
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if((ret = GdipCreateFromHDC(GetDC(hwnd), graphics)) != Ok)
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return ret;
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(*graphics)->hwnd = hwnd;
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return Ok;
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}
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GpStatus WINGDIPAPI GdipDeleteGraphics(GpGraphics *graphics)
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{
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if(!graphics) return InvalidParameter;
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if(graphics->hwnd)
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ReleaseDC(graphics->hwnd, graphics->hdc);
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HeapFree(GetProcessHeap(), 0, graphics);
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return Ok;
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}
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GpStatus WINGDIPAPI GdipDrawArc(GpGraphics *graphics, GpPen *pen, REAL x,
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REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
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{
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HGDIOBJ old_pen;
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REAL x_0, y_0, x_1, y_1, x_2, y_2;
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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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x_0 = x + (width/2.0);
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y_0 = y + (height/2.0);
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deg2xy(startAngle+sweepAngle, x_0, y_0, &x_1, &y_1);
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deg2xy(startAngle, x_0, y_0, &x_2, &y_2);
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Arc(graphics->hdc, roundr(x), roundr(y), roundr(x+width), roundr(y+height),
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roundr(x_1), roundr(y_1), roundr(x_2), roundr(y_2));
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SelectObject(graphics->hdc, old_pen);
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return Ok;
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}
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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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INT save_state;
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GpPointF pt[4];
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|
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if(!graphics || !pen)
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return InvalidParameter;
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pt[0].X = x1;
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pt[0].Y = y1;
|
|
pt[1].X = x2;
|
|
pt[1].Y = y2;
|
|
pt[2].X = x3;
|
|
pt[2].Y = y3;
|
|
pt[3].X = x4;
|
|
pt[3].Y = y4;
|
|
|
|
save_state = SaveDC(graphics->hdc);
|
|
EndPath(graphics->hdc);
|
|
SelectObject(graphics->hdc, pen->gdipen);
|
|
|
|
draw_polybezier(graphics->hdc, pen, pt, 4, TRUE);
|
|
|
|
RestoreDC(graphics->hdc, save_state);
|
|
|
|
return Ok;
|
|
}
|
|
|
|
/* Approximates cardinal spline with Bezier curves. */
|
|
GpStatus WINGDIPAPI GdipDrawCurve2(GpGraphics *graphics, GpPen *pen,
|
|
GDIPCONST GpPointF *points, INT count, REAL tension)
|
|
{
|
|
/* PolyBezier expects count*3-2 points. */
|
|
INT i, len_pt = count*3-2, save_state;
|
|
GpPointF *pt;
|
|
REAL x1, x2, y1, y2;
|
|
|
|
if(!graphics || !pen)
|
|
return InvalidParameter;
|
|
|
|
pt = GdipAlloc(len_pt * sizeof(GpPointF));
|
|
tension = tension * TENSION_CONST;
|
|
|
|
calc_curve_bezier_endp(points[0].X, points[0].Y, points[1].X, points[1].Y,
|
|
tension, &x1, &y1);
|
|
|
|
pt[0].X = points[0].X;
|
|
pt[0].Y = points[0].Y;
|
|
pt[1].X = x1;
|
|
pt[1].Y = y1;
|
|
|
|
for(i = 0; i < count-2; i++){
|
|
calc_curve_bezier(&(points[i]), tension, &x1, &y1, &x2, &y2);
|
|
|
|
pt[3*i+2].X = x1;
|
|
pt[3*i+2].Y = y1;
|
|
pt[3*i+3].X = points[i+1].X;
|
|
pt[3*i+3].Y = points[i+1].Y;
|
|
pt[3*i+4].X = x2;
|
|
pt[3*i+4].Y = y2;
|
|
}
|
|
|
|
calc_curve_bezier_endp(points[count-1].X, points[count-1].Y,
|
|
points[count-2].X, points[count-2].Y, tension, &x1, &y1);
|
|
|
|
pt[len_pt-2].X = x1;
|
|
pt[len_pt-2].Y = y1;
|
|
pt[len_pt-1].X = points[count-1].X;
|
|
pt[len_pt-1].Y = points[count-1].Y;
|
|
|
|
save_state = SaveDC(graphics->hdc);
|
|
EndPath(graphics->hdc);
|
|
SelectObject(graphics->hdc, pen->gdipen);
|
|
|
|
draw_polybezier(graphics->hdc, pen, pt, len_pt, TRUE);
|
|
|
|
GdipFree(pt);
|
|
RestoreDC(graphics->hdc, save_state);
|
|
|
|
return Ok;
|
|
}
|
|
|
|
GpStatus WINGDIPAPI GdipDrawLineI(GpGraphics *graphics, GpPen *pen, INT x1,
|
|
INT y1, INT x2, INT y2)
|
|
{
|
|
INT save_state;
|
|
GpPointF pt[2];
|
|
|
|
if(!pen || !graphics)
|
|
return InvalidParameter;
|
|
|
|
pt[0].X = (REAL)x1;
|
|
pt[0].Y = (REAL)y1;
|
|
pt[1].X = (REAL)x2;
|
|
pt[1].Y = (REAL)y2;
|
|
|
|
save_state = SaveDC(graphics->hdc);
|
|
EndPath(graphics->hdc);
|
|
SelectObject(graphics->hdc, pen->gdipen);
|
|
|
|
draw_polyline(graphics->hdc, pen, pt, 2, TRUE);
|
|
|
|
RestoreDC(graphics->hdc, save_state);
|
|
|
|
return Ok;
|
|
}
|
|
|
|
GpStatus WINGDIPAPI GdipDrawLines(GpGraphics *graphics, GpPen *pen, GDIPCONST
|
|
GpPointF *points, INT count)
|
|
{
|
|
HGDIOBJ old_obj;
|
|
INT i;
|
|
|
|
if(!pen || !graphics || (count < 2))
|
|
return InvalidParameter;
|
|
|
|
old_obj = SelectObject(graphics->hdc, pen->gdipen);
|
|
MoveToEx(graphics->hdc, roundr(points[0].X), roundr(points[0].Y), NULL);
|
|
|
|
for(i = 1; i < count; i++){
|
|
LineTo(graphics->hdc, roundr(points[i].X), roundr(points[i].Y));
|
|
}
|
|
|
|
SelectObject(graphics->hdc, old_obj);
|
|
|
|
return Ok;
|
|
}
|
|
|
|
GpStatus WINGDIPAPI GdipDrawPie(GpGraphics *graphics, GpPen *pen, REAL x,
|
|
REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
|
|
{
|
|
if(!pen)
|
|
return InvalidParameter;
|
|
|
|
return draw_pie(graphics, GetStockObject(NULL_BRUSH), pen->gdipen, x, y,
|
|
width, height, startAngle, sweepAngle);
|
|
}
|
|
|
|
GpStatus WINGDIPAPI GdipDrawRectangleI(GpGraphics *graphics, GpPen *pen, INT x,
|
|
INT y, INT width, INT height)
|
|
{
|
|
INT save_state;
|
|
|
|
if(!pen || !graphics)
|
|
return InvalidParameter;
|
|
|
|
save_state = SaveDC(graphics->hdc);
|
|
EndPath(graphics->hdc);
|
|
SelectObject(graphics->hdc, pen->gdipen);
|
|
SelectObject(graphics->hdc, GetStockObject(NULL_BRUSH));
|
|
|
|
Rectangle(graphics->hdc, x, y, x + width, y + height);
|
|
|
|
RestoreDC(graphics->hdc, save_state);
|
|
|
|
return Ok;
|
|
}
|
|
|
|
GpStatus WINGDIPAPI GdipFillPie(GpGraphics *graphics, GpBrush *brush, REAL x,
|
|
REAL y, REAL width, REAL height, REAL startAngle, REAL sweepAngle)
|
|
{
|
|
if(!brush)
|
|
return InvalidParameter;
|
|
|
|
return draw_pie(graphics, brush->gdibrush, GetStockObject(NULL_PEN), x, y,
|
|
width, height, startAngle, sweepAngle);
|
|
}
|