common shape: implement appendCircle body.

Change-Id: Ib8507366f84532db3119f04c8d55e0d4e8206f9f

inc/tizenvg.h

@@ -92,7 +92,7 @@ public:
     int update(RenderMethod* engine) noexcept override;
     int clear() noexcept;
 
-    int appendRect(float x, float y, float w, float h, float radius) noexcept;
+    int appendRect(float x, float y, float w, float h, float cornerRadius) noexcept;
     int appendCircle(float cx, float cy, float radius) noexcept;
 
     int fill(size_t r, size_t g, size_t b, size_t a) noexcept;

meson.build

@@ -1,6 +1,6 @@
 project('tizenvg',
         'cpp',
-        default_options : ['buildtype=debugoptimized', 'werror=false', 'cpp_std=c++14'],
+        default_options : ['buildtype=debug', 'werror=false', 'cpp_std=c++14'],
         version : '0.1.0',
         license : 'Apache-2.0')
 

src/lib/sw_engine/tvgSwRle.cpp

@@ -417,7 +417,7 @@ static void _lineTo(RleWorker& rw, const SwPoint& to)
             auto py = diff.y * ONE_PIXEL;
 
             //left
-            if (prod <= 0 && prod - px) {
+            if (prod <= 0 && prod - px > 0) {
                 f2 = {0, SW_UDIV(-prod, -dx_r)};
                 prod -= py;
                 rw.cover += (f2.y - f1.y);
@@ -557,9 +557,7 @@ static void _cubicTo(RleWorker& rw, const SwPoint& ctrl1, const SwPoint& ctrl2,
 
     draw:
         _lineTo(rw, arc[0]);
-
         if (arc == rw.bezStack) return;
-
         arc -= 3;
     }
 }
@@ -612,7 +610,7 @@ static bool _decomposeOutline(RleWorker& rw)
         }
 
         //Close the contour with a line segment?
-        //if (!lineTo(rw, outline->pts[first]));
+        //_lineTo(rw, UPSCALE(outline->pts[first]));
     close:
        first = last + 1;
     }
@@ -680,7 +678,7 @@ SwRleData* rleRender(const SwShape& sdata)
     rw.rle = reinterpret_cast<SwRleData*>(calloc(1, sizeof(SwRleData)));
     assert(rw.rle);
 
-    //printf("bufferSize = %d, bbox(%f %f %f %f), exCnt(%f), eyCnt(%f), bandSize(%d)\n", rw.bufferSize, rw.exMin, rw.eyMin, rw.exMax, rw.eyMax, rw.exCnt, rw.eyCnt, rw.bandSize);
+    //printf("bufferSize = %d, bbox(%d %d %d %d), exCnt(%f), eyCnt(%f), bandSize(%d)\n", rw.bufferSize, rw.cellMin.x, rw.cellMin.y, rw.cellMax.x, rw.cellMax.y, rw.cellXCnt, rw.cellYCnt, rw.bandSize);
 
     //Generate RLE
     Band bands[BAND_SIZE];

src/lib/tvgCommon.h

@@ -21,6 +21,7 @@
 #include <cassert>
 #include <vector>
 #include <math.h>
+#include <float.h>
 #include "tizenvg.h"
 #include "tvgRenderCommon.h"
 

src/lib/tvgShapeNode.cpp

@@ -136,21 +136,28 @@ int ShapeNode::pathCoords(const Point** pts) const noexcept
 
 int ShapeNode::appendCircle(float cx, float cy, float radius) noexcept
 {
+    auto impl = pImpl.get();
+    assert(impl);
+
+    impl->path->reserve(5, 13);   //decide size experimentally (move + curve * 4)
+    impl->path->arcTo(cx - radius, cy - radius, 2 * radius, 2 * radius, 0, 360);
+    impl->path->close();
+
     return 0;
 }
 
 
-int ShapeNode::appendRect(float x, float y, float w, float h, float radius) noexcept
+int ShapeNode::appendRect(float x, float y, float w, float h, float cornerRadius) noexcept
 {
     auto impl = pImpl.get();
     assert(impl);
 
-    //clamping radius by minimum size
+    //clamping cornerRadius by minimum size
     auto min = (w < h ? w : h) * 0.5f;
-    if (radius > min) radius = min;
+    if (cornerRadius > min) cornerRadius = min;
 
     //rectangle
-    if (radius == 0) {
+    if (cornerRadius == 0) {
         impl->path->reserve(5, 4);
         impl->path->moveTo(x, y);
         impl->path->lineTo(x + w, y);
@@ -158,8 +165,8 @@ int ShapeNode::appendRect(float x, float y, float w, float h, float radius) noex
         impl->path->lineTo(x, y + h);
         impl->path->close();
     //circle
-    } else if (w == h && radius * 2 == w) {
-        appendCircle(x + (w * 0.5f), y + (h * 0.5f), radius);
+    } else if (w == h && cornerRadius * 2 == w) {
+        return appendCircle(x + (w * 0.5f), y + (h * 0.5f), cornerRadius);
     } else {
         //...
     }

src/lib/tvgShapePath.h

@@ -23,6 +23,14 @@
 /* Internal Class Implementation                                        */
 /************************************************************************/
 
+constexpr auto PATH_KAPPA = 0.552284f;
+
+struct ShapePath;
+
+static float _arcAngle(float angle);
+static int _arcToCubic(ShapePath& path, const Point* pts, size_t ptsCnt);
+static void _findEllipseCoords(float x, float y, float w, float h, float startAngle, float sweepAngle, Point& ptStart, Point& ptEnd);
+
 struct ShapePath
 {
     PathCommand* cmds = nullptr;
@@ -111,6 +119,145 @@ struct ShapePath
         return 0;
     }
 
+
+    int arcTo(float x, float y, float w, float h, float startAngle, float sweepAngle)
+    {
+        if ((fabsf(w) < FLT_EPSILON) || (fabsf(h) < FLT_EPSILON)) return -1;
+        if (fabsf(sweepAngle) < FLT_EPSILON) return -1;
+
+        if (sweepAngle > 360) sweepAngle = 360;
+        else if (sweepAngle < -360) sweepAngle = -360;
+
+        auto half_w = w * 0.5f;
+        auto half_h = h * 0.5f;
+        auto half_w_kappa = half_w * PATH_KAPPA;
+        auto half_h_kappa = half_h * PATH_KAPPA;
+
+        //Curves for arc
+        Point pts[13] {
+            //start point: 0 degree
+            {x + w, y + half_h},
+
+            //0 -> 90 degree
+            {x + w, y + half_h + half_h_kappa},
+            {x + half_w + half_w_kappa, y + h},
+            {x + half_w, y + h},
+
+            //90 -> 180 degree
+            {x + half_w - half_w_kappa, y + h},
+            {x, y + half_h + half_h_kappa},
+            {x, y + half_h},
+
+            //180 -> 270 degree
+            {x, y + half_h - half_h_kappa},
+            {x + half_w - half_w_kappa, y},
+            {x + half_w, y},
+
+            //270 -> 0 degree
+            {x + half_w + half_w_kappa, y},
+            {x + w, y + half_h - half_h_kappa},
+            {x + w, y + half_w}
+        };
+
+        auto ptsCnt = 1;    //one is reserved for the start point
+        Point curves[13];
+
+        //perfect circle: special case fast paths
+        if (fabsf(startAngle) <= FLT_EPSILON) {
+            if (fabsf(sweepAngle - 360) <= FLT_EPSILON) {
+                for (int i = 11; i >= 0; --i) {
+                    curves[ptsCnt++] = pts[i];
+                }
+                curves[0] = pts[12];
+                return _arcToCubic(*this, curves, ptsCnt);
+            } else if (fabsf(sweepAngle + 360) <= FLT_EPSILON) {
+                for (int i = 1; i <= 12; ++i) {
+                    curves[ptsCnt++] = pts[i];
+                }
+                curves[0] = pts[0];
+                return _arcToCubic(*this, curves, ptsCnt);
+            }
+        }
+
+        auto startSegment = static_cast<int>(floor(startAngle / 90));
+        auto endSegment = static_cast<int>(floor((startAngle + sweepAngle) / 90));
+        auto startDelta = (startAngle - (startSegment * 90)) / 90;
+        auto endDelta = ((startAngle + sweepAngle) - (endSegment * 90)) / 90;
+        auto delta = sweepAngle > 0 ? 1 : -1;
+
+        if (delta < 0) {
+            startDelta = 1 - startDelta;
+            endDelta = 1 - endDelta;
+        }
+
+        //avoid empty start segment
+        if (fabsf(startDelta - 1) < FLT_EPSILON) {
+            startDelta = 0;
+            startSegment += delta;
+        }
+
+        //avoid empty end segment
+        if (fabsf(endDelta) < FLT_EPSILON) {
+            endDelta = 1;
+            endSegment -= delta;
+        }
+
+        startDelta = _arcAngle(startDelta * 90);
+        endDelta = _arcAngle(endDelta * 90);
+
+        auto splitAtStart = (fabsf(startDelta) >= FLT_EPSILON) ? true : false;
+        auto splitAtEnd = (fabsf(endDelta - 1.0f) >= FLT_EPSILON) ? true : false;
+        auto end = endSegment + delta;
+
+        //empty arc?
+        if (startSegment == end) {
+            auto quadrant = 3 - ((startSegment % 4) + 4) % 4;
+            auto i = 3 * quadrant;
+            curves[0] = (delta > 0) ? pts[i + 3] : pts[i];
+            return _arcToCubic(*this, curves, ptsCnt);
+        }
+
+        Point ptStart, ptEnd;
+        _findEllipseCoords(x, y, w, h, startAngle, sweepAngle, ptStart, ptEnd);
+
+        for (auto i = startSegment; i != end; i += delta) {
+            //auto quadrant = 3 - ((i % 4) + 4) % 4;
+            //auto j = 3 * quadrant;
+
+            if (delta > 0) {
+                //TODO: bezier
+            } else {
+                //TODO: bezier
+            }
+
+            //empty arc?
+            if (startSegment == endSegment && (fabsf(startDelta - endDelta) < FLT_EPSILON)) {
+                curves[0] = ptStart;
+                return _arcToCubic(*this, curves, ptsCnt);
+            }
+
+            if (i == startSegment) {
+                if (i == endSegment && splitAtEnd) {
+                    //TODO: bezier
+                } else if (splitAtStart) {
+                    //TODO: bezier
+                }
+            } else if (i == endSegment && splitAtEnd) {
+                //TODO: bezier
+            }
+
+            //push control points
+            //curves[ptsCnt++] = ctrlPt1;
+            //curves[ptsCnt++] = ctrlPt2;
+            //curves[ptsCnt++] = endPt;
+            cout << "ArcTo: Not Implemented!" << endl;
+        }
+
+        curves[ptsCnt - 1] = ptEnd;
+
+        return _arcToCubic(*this, curves, ptsCnt);
+    }
+
     int close()
     {
         if (cmdCnt + 1 > reservedCmdCnt) reserveCmd((cmdCnt + 1) * 2);
@@ -142,8 +289,101 @@ struct ShapePath
     }
 };
 
-/************************************************************************/
-/* External Class Implementation                                        */
-/************************************************************************/
+static float _arcAngle(float angle)
+ {
+    if (angle < FLT_EPSILON) return 0;
+    if (fabsf(angle - 90) < FLT_EPSILON) return 1;
+
+    auto radian = (angle / 180) * M_PI;
+    auto cosAngle = cos(radian);
+    auto sinAngle = sin(radian);
+
+    //initial guess
+    auto tc = angle / 90;
+
+    /* do some iterations of newton's method to approximate cosAngle
+       finds the zero of the function b.pointAt(tc).x() - cosAngle */
+    tc -= ((((2 - 3 * PATH_KAPPA) * tc + 3 * (PATH_KAPPA - 1)) * tc) * tc + 1 - cosAngle) // value
+    / (((6 - 9 * PATH_KAPPA) * tc + 6 * (PATH_KAPPA - 1)) * tc);                          // derivative
+    tc -= ((((2 - 3 * PATH_KAPPA) * tc + 3 * (PATH_KAPPA - 1)) * tc) * tc + 1 - cosAngle) // value
+    / (((6 - 9 * PATH_KAPPA) * tc + 6 * (PATH_KAPPA - 1)) * tc);                          // derivative
+
+    // initial guess
+    auto ts = tc;
+
+    /* do some iterations of newton's method to approximate sin_angle
+       finds the zero of the function b.pointAt(tc).y() - sinAngle */
+    ts -= ((((3 * PATH_KAPPA - 2) * ts - 6 * PATH_KAPPA + 3) * ts + 3 * PATH_KAPPA) * ts - sinAngle)
+    / (((9 * PATH_KAPPA - 6) * ts + 12 * PATH_KAPPA - 6) * ts + 3 * PATH_KAPPA);
+    ts -= ((((3 * PATH_KAPPA - 2) * ts - 6 * PATH_KAPPA + 3) * ts + 3 * PATH_KAPPA) * ts - sinAngle)
+    / (((9 * PATH_KAPPA - 6) * ts + 12 * PATH_KAPPA - 6) * ts + 3 * PATH_KAPPA);
+
+    //use the average of the t that best approximates cos_angle and the t that best approximates sin_angle
+    return (0.5 * (tc + ts));
+}
+
+
+static int _arcToCubic(ShapePath& path, const Point* pts, size_t ptsCnt)
+{
+    assert(pts);
+
+    if (path.cmdCnt > 0 && path.cmds[path.cmdCnt] != PathCommand::Close) {
+        if (path.lineTo(pts[0].x, pts[0].y)) return -1;
+    } else {
+        if (path.moveTo(pts[0].x, pts[0].y)) return -1;
+    }
+
+    for (size_t i = 1; i < ptsCnt; i += 3) {
+        if (path.cubicTo(pts[i].x, pts[i].y, pts[i+1].x, pts[i+1].y, pts[i+2].x, pts[i+2].y)) {
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+
+static void _findEllipseCoords(float x, float y, float w, float h, float startAngle, float sweepAngle, Point& ptStart, Point& ptEnd)
+{
+    float angles[2] = {startAngle, startAngle + sweepAngle};
+    float half_w = w * 0.5f;
+    float half_h = h * 0.5f;
+    float cx = x + half_w;
+    float cy = y + half_h;
+    Point* pts[2] = {&ptStart, &ptEnd};
+
+    for (auto i = 0; i < 2; ++i) {
+        auto theta = angles[i] - 360 * floor(angles[i] / 360);
+        auto t = theta / 90;
+        auto quadrant = static_cast<int>(t);    //truncate
+        t -= quadrant;
+        t = _arcAngle(90 * t);
+
+        //swap x and y?
+        if (quadrant & 1) t = (1 - t);
+
+        //bezier coefficients
+        auto m = 1 - t;
+        auto b = m * m;
+        auto c = t * t;
+        auto d = c * t;
+        auto a = b * m;
+        b *= 3 * t;
+        c *= 3 * m;
+
+        auto px = a + b + c * PATH_KAPPA;
+        auto py = d + c + b * PATH_KAPPA;
+
+        //left quadrants
+        if (quadrant == 1 || quadrant == 2) px = -px;
+
+        //top quadrants
+        if (quadrant == 0 || quadrant == 1) py = -py;
+
+        pts[i]->x = cx + half_w * px;
+        pts[i]->y = cy + half_h * py;
+    }
+}
+
 
 #endif //_TVG_SHAPE_PATH_CPP_

test/makefile

@@ -1,2 +1,3 @@
 all:
 	gcc -o testShape testShape.cpp -g -lstdc++ `pkg-config --cflags --libs elementary tizenvg`
+	gcc -o testMultipleShapes testMultipleShapes.cpp -g -lstdc++ `pkg-config --cflags --libs elementary tizenvg`

test/testMultipleShapes.cpp

@@ -1,4 +1,5 @@
 #include <tizenvg.h>
+#include <Elementary.h>
 
 using namespace std;
 
@@ -7,24 +8,24 @@ using namespace std;
 
 static uint32_t buffer[WIDTH * HEIGHT];
 
-int main(int argc, char **argv)
+void tvgtest()
 {
     //Initialize TizenVG Engine
     tvg::Engine::init();
 
     //Create a Canvas
     auto canvas = tvg::SwCanvas::gen(buffer, WIDTH, HEIGHT);
-    canvas->reserve(2);      //reserve 2 shape nodes (optional)
+    //canvas->reserve(2);      //reserve 2 shape nodes (optional)
 
     //Prepare Rectangle
     auto shape1 = tvg::ShapeNode::gen();
-    shape1->rect(0, 0, 400, 400, 0.1);        //x, y, w, h, corner_radius
+    shape1->appendRect(0, 0, 400, 400, 0);       //x, y, w, h, corner_radius
     shape1->fill(0, 255, 0, 255);                //r, g, b, a
     canvas->push(move(shape1));
 
     //Prepare Circle
     auto shape2 = tvg::ShapeNode::gen();
-    shape2->circle(400, 400, 200);            //cx, cy, radius
+    shape2->appendCircle(400, 400, 200);         //cx, cy, radius
     shape2->fill(255, 255, 0, 255);              //r, g, b, a
     canvas->push(move(shape2));
 
@@ -35,3 +36,26 @@ int main(int argc, char **argv)
     //Terminate TizenVG Engine
     tvg::Engine::term();
 }
+
+int main(int argc, char **argv)
+{
+    tvgtest();
+
+    //Show the result using EFL...
+    elm_init(argc, argv);
+
+    Eo* win = elm_win_util_standard_add(NULL, "TizenVG Test");
+
+    Eo* img = evas_object_image_filled_add(evas_object_evas_get(win));
+    evas_object_image_size_set(img, WIDTH, HEIGHT);
+    evas_object_image_data_set(img, buffer);
+    evas_object_size_hint_weight_set(img, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
+    evas_object_show(img);
+
+    elm_win_resize_object_add(win, img);
+    evas_object_geometry_set(win, 0, 0, WIDTH, HEIGHT);
+    evas_object_show(win);
+
+    elm_run();
+    elm_shutdown();
+}