diff options
Diffstat (limited to 'thirdparty/thorvg/src/lib/sw_engine/tvgSwStroke.cpp')
| -rw-r--r-- | thirdparty/thorvg/src/lib/sw_engine/tvgSwStroke.cpp | 932 |
1 files changed, 932 insertions, 0 deletions
diff --git a/thirdparty/thorvg/src/lib/sw_engine/tvgSwStroke.cpp b/thirdparty/thorvg/src/lib/sw_engine/tvgSwStroke.cpp new file mode 100644 index 0000000000..c0cfc1be26 --- /dev/null +++ b/thirdparty/thorvg/src/lib/sw_engine/tvgSwStroke.cpp @@ -0,0 +1,932 @@ +/* + * Copyright (c) 2020-2021 Samsung Electronics Co., Ltd. All rights reserved. + + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#include <string.h> +#include <math.h> +#include "tvgSwCommon.h" + +/************************************************************************/ +/* Internal Class Implementation */ +/************************************************************************/ + +static constexpr auto SW_STROKE_TAG_POINT = 1; +static constexpr auto SW_STROKE_TAG_CUBIC = 2; +static constexpr auto SW_STROKE_TAG_BEGIN = 4; +static constexpr auto SW_STROKE_TAG_END = 8; + +static inline SwFixed SIDE_TO_ROTATE(const int32_t s) +{ + return (SW_ANGLE_PI2 - static_cast<SwFixed>(s) * SW_ANGLE_PI); +} + + +static inline void SCALE(const SwStroke& stroke, SwPoint& pt) +{ + pt.x = static_cast<SwCoord>(pt.x * stroke.sx); + pt.y = static_cast<SwCoord>(pt.y * stroke.sy); +} + + +static void _growBorder(SwStrokeBorder* border, uint32_t newPts) +{ + auto maxOld = border->maxPts; + auto maxNew = border->ptsCnt + newPts; + + if (maxNew <= maxOld) return; + + auto maxCur = maxOld; + + while (maxCur < maxNew) + maxCur += (maxCur >> 1) + 16; + //OPTIMIZE: use mempool! + border->pts = static_cast<SwPoint*>(realloc(border->pts, maxCur * sizeof(SwPoint))); + border->tags = static_cast<uint8_t*>(realloc(border->tags, maxCur * sizeof(uint8_t))); + border->maxPts = maxCur; +} + + +static void _borderClose(SwStrokeBorder* border, bool reverse) +{ + auto start = border->start; + auto count = border->ptsCnt; + + //Don't record empty paths! + if (count <= start + 1U) { + border->ptsCnt = start; + } else { + /* Copy the last point to the start of this sub-path, + since it contains the adjusted starting coordinates */ + border->ptsCnt = --count; + border->pts[start] = border->pts[count]; + + if (reverse) { + //reverse the points + auto pt1 = border->pts + start + 1; + auto pt2 = border->pts + count - 1; + + while (pt1 < pt2) { + auto tmp = *pt1; + *pt1 = *pt2; + *pt2 = tmp; + ++pt1; + --pt2; + } + + //reverse the tags + auto tag1 = border->tags + start + 1; + auto tag2 = border->tags + count - 1; + + while (tag1 < tag2) { + auto tmp = *tag1; + *tag1 = *tag2; + *tag2 = tmp; + ++tag1; + --tag2; + } + } + + border->tags[start] |= SW_STROKE_TAG_BEGIN; + border->tags[count - 1] |= SW_STROKE_TAG_END; + } + + border->start = -1; + border->movable = false; +} + + +static void _borderCubicTo(SwStrokeBorder* border, const SwPoint& ctrl1, const SwPoint& ctrl2, const SwPoint& to) +{ + _growBorder(border, 3); + + auto pt = border->pts + border->ptsCnt; + auto tag = border->tags + border->ptsCnt; + + pt[0] = ctrl1; + pt[1] = ctrl2; + pt[2] = to; + + tag[0] = SW_STROKE_TAG_CUBIC; + tag[1] = SW_STROKE_TAG_CUBIC; + tag[2] = SW_STROKE_TAG_POINT; + + border->ptsCnt += 3; + + border->movable = false; +} + + +static void _borderArcTo(SwStrokeBorder* border, const SwPoint& center, SwFixed radius, SwFixed angleStart, SwFixed angleDiff, SwStroke& stroke) +{ + constexpr SwFixed ARC_CUBIC_ANGLE = SW_ANGLE_PI / 2; + SwPoint a = {static_cast<SwCoord>(radius), 0}; + mathRotate(a, angleStart); + SCALE(stroke, a); + a += center; + + auto total = angleDiff; + auto angle = angleStart; + auto rotate = (angleDiff >= 0) ? SW_ANGLE_PI2 : -SW_ANGLE_PI2; + + while (total != 0) { + auto step = total; + if (step > ARC_CUBIC_ANGLE) step = ARC_CUBIC_ANGLE; + else if (step < -ARC_CUBIC_ANGLE) step = -ARC_CUBIC_ANGLE; + + auto next = angle + step; + auto theta = step; + if (theta < 0) theta = -theta; + + theta >>= 1; + + //compute end point + SwPoint b = {static_cast<SwCoord>(radius), 0}; + mathRotate(b, next); + SCALE(stroke, b); + b += center; + + //compute first and second control points + auto length = mathMulDiv(radius, mathSin(theta) * 4, (0x10000L + mathCos(theta)) * 3); + + SwPoint a2 = {static_cast<SwCoord>(length), 0}; + mathRotate(a2, angle + rotate); + SCALE(stroke, a2); + a2 += a; + + SwPoint b2 = {static_cast<SwCoord>(length), 0}; + mathRotate(b2, next - rotate); + SCALE(stroke, b2); + b2 += b; + + //add cubic arc + _borderCubicTo(border, a2, b2, b); + + //process the rest of the arc? + a = b; + total -= step; + angle = next; + } +} + + +static void _borderLineTo(SwStrokeBorder* border, const SwPoint& to, bool movable) +{ + if (border->movable) { + //move last point + border->pts[border->ptsCnt - 1] = to; + } else { + + //don't add zero-length line_to + if (border->ptsCnt > 0 && (border->pts[border->ptsCnt - 1] - to).small()) return; + + _growBorder(border, 1); + border->pts[border->ptsCnt] = to; + border->tags[border->ptsCnt] = SW_STROKE_TAG_POINT; + border->ptsCnt += 1; + } + + border->movable = movable; +} + + +static void _borderMoveTo(SwStrokeBorder* border, SwPoint& to) +{ + //close current open path if any? + if (border->start >= 0) _borderClose(border, false); + + border->start = border->ptsCnt; + border->movable = false; + + _borderLineTo(border, to, false); +} + + +static void _arcTo(SwStroke& stroke, int32_t side) +{ + auto border = stroke.borders + side; + auto rotate = SIDE_TO_ROTATE(side); + auto total = mathDiff(stroke.angleIn, stroke.angleOut); + if (total == SW_ANGLE_PI) total = -rotate * 2; + + _borderArcTo(border, stroke.center, stroke.width, stroke.angleIn + rotate, total, stroke); + border->movable = false; +} + + +static void _outside(SwStroke& stroke, int32_t side, SwFixed lineLength) +{ + constexpr SwFixed MITER_LIMIT = 4 * (1 << 16); + + auto border = stroke.borders + side; + + if (stroke.join == StrokeJoin::Round) { + _arcTo(stroke, side); + } else { + //this is a mitered (pointed) or beveled (truncated) corner + auto rotate = SIDE_TO_ROTATE(side); + auto bevel = (stroke.join == StrokeJoin::Bevel) ? true : false; + SwFixed phi = 0; + SwFixed thcos = 0; + + if (!bevel) { + auto theta = mathDiff(stroke.angleIn, stroke.angleOut); + if (theta == SW_ANGLE_PI) { + theta = rotate; + phi = stroke.angleIn; + } else { + theta /= 2; + phi = stroke.angleIn + theta + rotate; + } + + thcos = mathCos(theta); + auto sigma = mathMultiply(MITER_LIMIT, thcos); + + //is miter limit exceeded? + if (sigma < 0x10000L) bevel = true; + } + + //this is a bevel (broken angle) + if (bevel) { + SwPoint delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, stroke.angleOut + rotate); + SCALE(stroke, delta); + delta += stroke.center; + border->movable = false; + _borderLineTo(border, delta, false); + //this is a miter (intersection) + } else { + auto length = mathDivide(stroke.width, thcos); + SwPoint delta = {static_cast<SwCoord>(length), 0}; + mathRotate(delta, phi); + SCALE(stroke, delta); + delta += stroke.center; + _borderLineTo(border, delta, false); + + /* Now add and end point + Only needed if not lineto (lineLength is zero for curves) */ + if (lineLength == 0) { + delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, stroke.angleOut + rotate); + SCALE(stroke, delta); + delta += stroke.center; + _borderLineTo(border, delta, false); + } + } + } +} + + +static void _inside(SwStroke& stroke, int32_t side, SwFixed lineLength) +{ + auto border = stroke.borders + side; + auto theta = mathDiff(stroke.angleIn, stroke.angleOut) / 2; + SwPoint delta; + bool intersect = false; + + /* Only intersect borders if between two line_to's and both + lines are long enough (line length is zero fur curves). */ + if (border->movable && lineLength > 0) { + //compute minimum required length of lines + SwFixed minLength = abs(mathMultiply(stroke.width, mathTan(theta))); + if (stroke.lineLength >= minLength && lineLength >= minLength) intersect = true; + } + + auto rotate = SIDE_TO_ROTATE(side); + + if (!intersect) { + delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, stroke.angleOut + rotate); + SCALE(stroke, delta); + delta += stroke.center; + border->movable = false; + } else { + //compute median angle + auto phi = stroke.angleIn + theta; + auto thcos = mathCos(theta); + delta = {static_cast<SwCoord>(mathDivide(stroke.width, thcos)), 0}; + mathRotate(delta, phi + rotate); + SCALE(stroke, delta); + delta += stroke.center; + } + + _borderLineTo(border, delta, false); +} + + +void _processCorner(SwStroke& stroke, SwFixed lineLength) +{ + auto turn = mathDiff(stroke.angleIn, stroke.angleOut); + + //no specific corner processing is required if the turn is 0 + if (turn == 0) return; + + //when we turn to the right, the inside side is 0 + int32_t inside = 0; + + //otherwise, the inside is 1 + if (turn < 0) inside = 1; + + //process the inside + _inside(stroke, inside, lineLength); + + //process the outside + _outside(stroke, 1 - inside, lineLength); +} + + +void _firstSubPath(SwStroke& stroke, SwFixed startAngle, SwFixed lineLength) +{ + SwPoint delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, startAngle + SW_ANGLE_PI2); + SCALE(stroke, delta); + + auto pt = stroke.center + delta; + auto border = stroke.borders; + _borderMoveTo(border, pt); + + pt = stroke.center - delta; + ++border; + _borderMoveTo(border, pt); + + /* Save angle, position and line length for last join + lineLength is zero for curves */ + stroke.subPathAngle = startAngle; + stroke.firstPt = false; + stroke.subPathLineLength = lineLength; +} + + +static void _lineTo(SwStroke& stroke, const SwPoint& to) +{ + auto delta = to - stroke.center; + + //a zero-length lineto is a no-op; avoid creating a spurious corner + if (delta.zero()) return; + + //compute length of line + auto lineLength = mathLength(delta); + auto angle = mathAtan(delta); + + delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, angle + SW_ANGLE_PI2); + SCALE(stroke, delta); + + //process corner if necessary + if (stroke.firstPt) { + /* This is the first segment of a subpath. We need to add a point to each border + at their respective starting point locations. */ + _firstSubPath(stroke, angle, lineLength); + } else { + //process the current corner + stroke.angleOut = angle; + _processCorner(stroke, lineLength); + } + + //now add a line segment to both the inside and outside paths + auto border = stroke.borders; + auto side = 1; + + while (side >= 0) { + auto pt = to + delta; + + //the ends of lineto borders are movable + _borderLineTo(border, pt, true); + + delta.x = -delta.x; + delta.y = -delta.y; + + --side; + ++border; + } + + stroke.angleIn = angle; + stroke.center = to; + stroke.lineLength = lineLength; +} + + +static void _cubicTo(SwStroke& stroke, const SwPoint& ctrl1, const SwPoint& ctrl2, const SwPoint& to) +{ + /* if all control points are coincident, this is a no-op; + avoid creating a spurious corner */ + if ((stroke.center - ctrl1).small() && (ctrl1 - ctrl2).small() && (ctrl2 - to).small()) { + stroke.center = to; + return; + } + + SwPoint bezStack[37]; //TODO: static? + auto limit = bezStack + 32; + auto arc = bezStack; + auto firstArc = true; + arc[0] = to; + arc[1] = ctrl2; + arc[2] = ctrl1; + arc[3] = stroke.center; + + while (arc >= bezStack) { + SwFixed angleIn, angleOut, angleMid; + + //initialize with current direction + angleIn = angleOut = angleMid = stroke.angleIn; + + if (arc < limit && !mathSmallCubic(arc, angleIn, angleMid, angleOut)) { + if (stroke.firstPt) stroke.angleIn = angleIn; + mathSplitCubic(arc); + arc += 3; + continue; + } + + if (firstArc) { + firstArc = false; + //process corner if necessary + if (stroke.firstPt) { + _firstSubPath(stroke, angleIn, 0); + } else { + stroke.angleOut = angleIn; + _processCorner(stroke, 0); + } + } else if (abs(mathDiff(stroke.angleIn, angleIn)) > (SW_ANGLE_PI / 8) / 4) { + //if the deviation from one arc to the next is too great add a round corner + stroke.center = arc[3]; + stroke.angleOut = angleIn; + stroke.join = StrokeJoin::Round; + + _processCorner(stroke, 0); + + //reinstate line join style + stroke.join = stroke.joinSaved; + } + + //the arc's angle is small enough; we can add it directly to each border + auto theta1 = mathDiff(angleIn, angleMid) / 2; + auto theta2 = mathDiff(angleMid, angleOut) / 2; + auto phi1 = mathMean(angleIn, angleMid); + auto phi2 = mathMean(angleMid, angleOut); + auto length1 = mathDivide(stroke.width, mathCos(theta1)); + auto length2 = mathDivide(stroke.width, mathCos(theta2)); + SwFixed alpha0 = 0; + + //compute direction of original arc + if (stroke.handleWideStrokes) { + alpha0 = mathAtan(arc[0] - arc[3]); + } + + auto border = stroke.borders; + int32_t side = 0; + + while (side <= 1) + { + auto rotate = SIDE_TO_ROTATE(side); + + //compute control points + SwPoint _ctrl1 = {static_cast<SwCoord>(length1), 0}; + mathRotate(_ctrl1, phi1 + rotate); + SCALE(stroke, _ctrl1); + _ctrl1 += arc[2]; + + SwPoint _ctrl2 = {static_cast<SwCoord>(length2), 0}; + mathRotate(_ctrl2, phi2 + rotate); + SCALE(stroke, _ctrl2); + _ctrl2 += arc[1]; + + //compute end point + SwPoint _end = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(_end, angleOut + rotate); + SCALE(stroke, _end); + _end += arc[0]; + + if (stroke.handleWideStrokes) { + + /* determine whether the border radius is greater than the radius of + curvature of the original arc */ + auto _start = border->pts[border->ptsCnt - 1]; + auto alpha1 = mathAtan(_end - _start); + + //is the direction of the border arc opposite to that of the original arc? + if (abs(mathDiff(alpha0, alpha1)) > SW_ANGLE_PI / 2) { + + //use the sine rule to find the intersection point + auto beta = mathAtan(arc[3] - _start); + auto gamma = mathAtan(arc[0] - _end); + auto bvec = _end - _start; + auto blen = mathLength(bvec); + auto sinA = abs(mathSin(alpha1 - gamma)); + auto sinB = abs(mathSin(beta - gamma)); + auto alen = mathMulDiv(blen, sinA, sinB); + + SwPoint delta = {static_cast<SwCoord>(alen), 0}; + mathRotate(delta, beta); + delta += _start; + + //circumnavigate the negative sector backwards + border->movable = false; + _borderLineTo(border, delta, false); + _borderLineTo(border, _end, false); + _borderCubicTo(border, _ctrl2, _ctrl1, _start); + + //and then move to the endpoint + _borderLineTo(border, _end, false); + + ++side; + ++border; + continue; + } + + //else fall through + } + _borderCubicTo(border, _ctrl1, _ctrl2, _end); + ++side; + ++border; + } + arc -= 3; + stroke.angleIn = angleOut; + } + stroke.center = to; +} + + +static void _addCap(SwStroke& stroke, SwFixed angle, int32_t side) +{ + if (stroke.cap == StrokeCap::Square) { + auto rotate = SIDE_TO_ROTATE(side); + auto border = stroke.borders + side; + + SwPoint delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, angle); + SCALE(stroke, delta); + + SwPoint delta2 = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta2, angle + rotate); + SCALE(stroke, delta2); + delta += stroke.center + delta2; + + _borderLineTo(border, delta, false); + + delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, angle); + SCALE(stroke, delta); + + delta2 = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta2, angle - rotate); + SCALE(stroke, delta2); + delta += delta2 + stroke.center; + + _borderLineTo(border, delta, false); + + } else if (stroke.cap == StrokeCap::Round) { + + stroke.angleIn = angle; + stroke.angleOut = angle + SW_ANGLE_PI; + _arcTo(stroke, side); + return; + + } else { //Butt + auto rotate = SIDE_TO_ROTATE(side); + auto border = stroke.borders + side; + + SwPoint delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, angle + rotate); + SCALE(stroke, delta); + delta += stroke.center; + + _borderLineTo(border, delta, false); + + delta = {static_cast<SwCoord>(stroke.width), 0}; + mathRotate(delta, angle - rotate); + SCALE(stroke, delta); + delta += stroke.center; + + _borderLineTo(border, delta, false); + } +} + + +static void _addReverseLeft(SwStroke& stroke, bool opened) +{ + auto right = stroke.borders + 0; + auto left = stroke.borders + 1; + auto newPts = left->ptsCnt - left->start; + + if (newPts <= 0) return; + + _growBorder(right, newPts); + + auto dstPt = right->pts + right->ptsCnt; + auto dstTag = right->tags + right->ptsCnt; + auto srcPt = left->pts + left->ptsCnt - 1; + auto srcTag = left->tags + left->ptsCnt - 1; + + while (srcPt >= left->pts + left->start) { + *dstPt = *srcPt; + *dstTag = *srcTag; + + if (opened) { + dstTag[0] &= ~(SW_STROKE_TAG_BEGIN | SW_STROKE_TAG_END); + } else { + //switch begin/end tags if necessary + auto ttag = dstTag[0] & (SW_STROKE_TAG_BEGIN | SW_STROKE_TAG_END); + if (ttag == SW_STROKE_TAG_BEGIN || ttag == SW_STROKE_TAG_END) + dstTag[0] ^= (SW_STROKE_TAG_BEGIN | SW_STROKE_TAG_END); + } + + --srcPt; + --srcTag; + ++dstPt; + ++dstTag; + } + + left->ptsCnt = left->start; + right->ptsCnt += newPts; + right->movable = false; + left->movable = false; +} + + +static void _beginSubPath(SwStroke& stroke, const SwPoint& to, bool closed) +{ + /* We cannot process the first point because there is not enough + information regarding its corner/cap. Later, it will be processed + in the _endSubPath() */ + + stroke.firstPt = true; + stroke.center = to; + stroke.closedSubPath = closed; + + /* Determine if we need to check whether the border radius is greater + than the radius of curvature of a curve, to handle this case specially. + This is only required if bevel joins or butt caps may be created because + round & miter joins and round & square caps cover the nagative sector + created with wide strokes. */ + if ((stroke.join != StrokeJoin::Round) || (!stroke.closedSubPath && stroke.cap == StrokeCap::Butt)) + stroke.handleWideStrokes = true; + else + stroke.handleWideStrokes = false; + + stroke.ptStartSubPath = to; + stroke.angleIn = 0; +} + + +static void _endSubPath(SwStroke& stroke) +{ + if (stroke.closedSubPath) { + //close the path if needed + if (stroke.center != stroke.ptStartSubPath) + _lineTo(stroke, stroke.ptStartSubPath); + + //process the corner + stroke.angleOut = stroke.subPathAngle; + auto turn = mathDiff(stroke.angleIn, stroke.angleOut); + + //No specific corner processing is required if the turn is 0 + if (turn != 0) { + + //when we turn to the right, the inside is 0 + int32_t inside = 0; + + //otherwise, the inside is 1 + if (turn < 0) inside = 1; + + _inside(stroke, inside, stroke.subPathLineLength); //inside + _outside(stroke, 1 - inside, stroke.subPathLineLength); //outside + } + + _borderClose(stroke.borders + 0, false); + _borderClose(stroke.borders + 1, true); + } else { + auto right = stroke.borders; + + /* all right, this is an opened path, we need to add a cap between + right & left, add the reverse of left, then add a final cap + between left & right */ + _addCap(stroke, stroke.angleIn, 0); + + //add reversed points from 'left' to 'right' + _addReverseLeft(stroke, true); + + //now add the final cap + stroke.center = stroke.ptStartSubPath; + _addCap(stroke, stroke.subPathAngle + SW_ANGLE_PI, 0); + + /* now end the right subpath accordingly. The left one is rewind + and deosn't need further processing */ + _borderClose(right, false); + } +} + + +static void _getCounts(SwStrokeBorder* border, uint32_t& ptsCnt, uint32_t& cntrsCnt) +{ + auto count = border->ptsCnt; + auto tags = border->tags; + uint32_t _ptsCnt = 0; + uint32_t _cntrsCnt = 0; + bool inCntr = false; + + while (count > 0) { + if (tags[0] & SW_STROKE_TAG_BEGIN) { + if (inCntr) goto fail; + inCntr = true; + } else if (!inCntr) goto fail; + + if (tags[0] & SW_STROKE_TAG_END) { + inCntr = false; + ++_cntrsCnt; + } + --count; + ++_ptsCnt; + ++tags; + } + + if (inCntr) goto fail; + + ptsCnt = _ptsCnt; + cntrsCnt = _cntrsCnt; + + return; + +fail: + ptsCnt = 0; + cntrsCnt = 0; +} + + +static void _exportBorderOutline(const SwStroke& stroke, SwOutline* outline, uint32_t side) +{ + auto border = stroke.borders + side; + + if (border->ptsCnt == 0) return; //invalid border + + memcpy(outline->pts + outline->ptsCnt, border->pts, border->ptsCnt * sizeof(SwPoint)); + + auto cnt = border->ptsCnt; + auto src = border->tags; + auto tags = outline->types + outline->ptsCnt; + auto cntrs = outline->cntrs + outline->cntrsCnt; + uint16_t idx = outline->ptsCnt; + + while (cnt > 0) { + + if (*src & SW_STROKE_TAG_POINT) *tags = SW_CURVE_TYPE_POINT; + else if (*src & SW_STROKE_TAG_CUBIC) *tags = SW_CURVE_TYPE_CUBIC; + else { + //LOG: What type of stroke outline?? + } + + if (*src & SW_STROKE_TAG_END) { + *cntrs = idx; + ++cntrs; + ++outline->cntrsCnt; + } + ++src; + ++tags; + ++idx; + --cnt; + } + outline->ptsCnt = outline->ptsCnt + border->ptsCnt; +} + + +/************************************************************************/ +/* External Class Implementation */ +/************************************************************************/ + +void strokeFree(SwStroke* stroke) +{ + if (!stroke) return; + + //free borders + if (stroke->borders[0].pts) free(stroke->borders[0].pts); + if (stroke->borders[0].tags) free(stroke->borders[0].tags); + if (stroke->borders[1].pts) free(stroke->borders[1].pts); + if (stroke->borders[1].tags) free(stroke->borders[1].tags); + + fillFree(stroke->fill); + stroke->fill = nullptr; + + free(stroke); +} + + +void strokeReset(SwStroke* stroke, const Shape* sdata, const Matrix* transform) +{ + if (transform) { + stroke->sx = sqrtf(powf(transform->e11, 2.0f) + powf(transform->e21, 2.0f)); + stroke->sy = sqrtf(powf(transform->e12, 2.0f) + powf(transform->e22, 2.0f)); + } else { + stroke->sx = stroke->sy = 1.0f; + } + + stroke->width = HALF_STROKE(sdata->strokeWidth()); + stroke->cap = sdata->strokeCap(); + + //Save line join: it can be temporarily changed when stroking curves... + stroke->joinSaved = stroke->join = sdata->strokeJoin(); + + stroke->borders[0].ptsCnt = 0; + stroke->borders[0].start = -1; + stroke->borders[1].ptsCnt = 0; + stroke->borders[1].start = -1; +} + + +bool strokeParseOutline(SwStroke* stroke, const SwOutline& outline) +{ + uint32_t first = 0; + + for (uint32_t i = 0; i < outline.cntrsCnt; ++i) { + auto last = outline.cntrs[i]; //index of last point in contour + auto limit = outline.pts + last; + + //Skip empty points + if (last <= first) { + first = last + 1; + continue; + } + + auto start = outline.pts[first]; + auto pt = outline.pts + first; + auto types = outline.types + first; + auto type = types[0]; + + //A contour cannot start with a cubic control point + if (type == SW_CURVE_TYPE_CUBIC) return false; + + auto closed = outline.closed ? outline.closed[i]: false; + + _beginSubPath(*stroke, start, closed); + + while (pt < limit) { + ++pt; + ++types; + + //emit a signel line_to + if (types[0] == SW_CURVE_TYPE_POINT) { + _lineTo(*stroke, *pt); + //types cubic + } else { + if (pt + 1 > limit || types[1] != SW_CURVE_TYPE_CUBIC) return false; + + pt += 2; + types += 2; + + if (pt <= limit) { + _cubicTo(*stroke, pt[-2], pt[-1], pt[0]); + continue; + } + _cubicTo(*stroke, pt[-2], pt[-1], start); + goto close; + } + } + + close: + if (!stroke->firstPt) _endSubPath(*stroke); + first = last + 1; + } + return true; +} + + +SwOutline* strokeExportOutline(SwStroke* stroke, SwMpool* mpool, unsigned tid) +{ + uint32_t count1, count2, count3, count4; + + _getCounts(stroke->borders + 0, count1, count2); + _getCounts(stroke->borders + 1, count3, count4); + + auto ptsCnt = count1 + count3; + auto cntrsCnt = count2 + count4; + + auto outline = mpoolReqStrokeOutline(mpool, tid); + if (outline->reservedPtsCnt < ptsCnt) { + outline->pts = static_cast<SwPoint*>(realloc(outline->pts, sizeof(SwPoint) * ptsCnt)); + outline->types = static_cast<uint8_t*>(realloc(outline->types, sizeof(uint8_t) * ptsCnt)); + outline->reservedPtsCnt = ptsCnt; + } + if (outline->reservedCntrsCnt < cntrsCnt) { + outline->cntrs = static_cast<uint16_t*>(realloc(outline->cntrs, sizeof(uint16_t) * cntrsCnt)); + outline->reservedCntrsCnt = cntrsCnt; + } + + _exportBorderOutline(*stroke, outline, 0); //left + _exportBorderOutline(*stroke, outline, 1); //right + + return outline; +} |