Use ThorVG instead of NanoSVG for importing SVGs

ThorVG is a platform-independent portable library for drawing vector-based
scene and animation.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

1 files changed, 664 insertions, 0 deletions

diff --git a/thirdparty/thorvg/src/lib/sw_engine/tvgSwShape.cpp b/thirdparty/thorvg/src/lib/sw_engine/tvgSwShape.cpp
new file mode 100644
index 0000000000..7b49c232b1
--- /dev/null
+++ b/thirdparty/thorvg/src/lib/sw_engine/tvgSwShape.cpp
@@ -0,0 +1,664 @@
+/*
+ * 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 "tvgSwCommon.h"
+#include "tvgBezier.h"
+#include <float.h>
+#include <math.h>
+
+/************************************************************************/
+/* Internal Class Implementation                                        */
+/************************************************************************/
+
+struct Line
+{
+    Point pt1;
+    Point pt2;
+};
+
+
+static float _lineLength(const Point& pt1, const Point& pt2)
+{
+    /* approximate sqrt(x*x + y*y) using alpha max plus beta min algorithm.
+       With alpha = 1, beta = 3/8, giving results with the largest error less
+       than 7% compared to the exact value. */
+    Point diff = {pt2.x - pt1.x, pt2.y - pt1.y};
+    if (diff.x < 0) diff.x = -diff.x;
+    if (diff.y < 0) diff.y = -diff.y;
+    return (diff.x > diff.y) ? (diff.x + diff.y * 0.375f) : (diff.y + diff.x * 0.375f);
+}
+
+
+static void _lineSplitAt(const Line& cur, float at, Line& left, Line& right)
+{
+    auto len = _lineLength(cur.pt1, cur.pt2);
+    auto dx = ((cur.pt2.x - cur.pt1.x) / len) * at;
+    auto dy = ((cur.pt2.y - cur.pt1.y) / len) * at;
+    left.pt1 = cur.pt1;
+    left.pt2.x = left.pt1.x + dx;
+    left.pt2.y = left.pt1.y + dy;
+    right.pt1 = left.pt2;
+    right.pt2 = cur.pt2;
+}
+
+
+static bool _growOutlineContour(SwOutline& outline, uint32_t n)
+{
+    if (outline.reservedCntrsCnt >= outline.cntrsCnt + n) return false;
+    outline.reservedCntrsCnt = outline.cntrsCnt + n;
+    outline.cntrs = static_cast<uint16_t*>(realloc(outline.cntrs, outline.reservedCntrsCnt * sizeof(uint16_t)));
+    return true;
+}
+
+
+static void _reserveOutlineClose(SwOutline& outline)
+{
+    //Dash outlines are always opened.
+    //Only normal outlines use this information, it sholud be same to their contour counts.
+    if (outline.closed) free(outline.closed);
+    outline.closed = static_cast<bool*>(calloc(outline.reservedCntrsCnt, sizeof(bool)));
+}
+
+
+static void _resetOutlineClose(SwOutline& outline)
+{
+    memset(outline.closed, 0x0, outline.reservedCntrsCnt * sizeof(bool));
+}
+
+
+static void _growOutlinePoint(SwOutline& outline, uint32_t n)
+{
+    if (outline.reservedPtsCnt >= outline.ptsCnt + n) return;
+    outline.reservedPtsCnt = outline.ptsCnt + n;
+    outline.pts = static_cast<SwPoint*>(realloc(outline.pts, outline.reservedPtsCnt * sizeof(SwPoint)));
+    outline.types = static_cast<uint8_t*>(realloc(outline.types, outline.reservedPtsCnt * sizeof(uint8_t)));
+}
+
+
+static void _outlineEnd(SwOutline& outline)
+{
+    if (outline.ptsCnt == 0) return;
+
+    _growOutlineContour(outline, 1);
+    outline.cntrs[outline.cntrsCnt] = outline.ptsCnt - 1;
+    ++outline.cntrsCnt;
+}
+
+
+static void _outlineMoveTo(SwOutline& outline, const Point* to, const Matrix* transform)
+{
+    _growOutlinePoint(outline, 1);
+
+    outline.pts[outline.ptsCnt] = mathTransform(to, transform);
+    outline.types[outline.ptsCnt] = SW_CURVE_TYPE_POINT;
+
+    if (outline.ptsCnt > 0) {
+        _growOutlineContour(outline, 1);
+        outline.cntrs[outline.cntrsCnt] = outline.ptsCnt - 1;
+        ++outline.cntrsCnt;
+    }
+
+    ++outline.ptsCnt;
+}
+
+
+static void _outlineLineTo(SwOutline& outline, const Point* to, const Matrix* transform)
+{
+    _growOutlinePoint(outline, 1);
+
+    outline.pts[outline.ptsCnt] = mathTransform(to, transform);
+    outline.types[outline.ptsCnt] = SW_CURVE_TYPE_POINT;
+    ++outline.ptsCnt;
+}
+
+
+static void _outlineCubicTo(SwOutline& outline, const Point* ctrl1, const Point* ctrl2, const Point* to, const Matrix* transform)
+{
+    _growOutlinePoint(outline, 3);
+
+    outline.pts[outline.ptsCnt] = mathTransform(ctrl1, transform);
+    outline.types[outline.ptsCnt] = SW_CURVE_TYPE_CUBIC;
+    ++outline.ptsCnt;
+
+    outline.pts[outline.ptsCnt] = mathTransform(ctrl2, transform);
+    outline.types[outline.ptsCnt] = SW_CURVE_TYPE_CUBIC;
+    ++outline.ptsCnt;
+
+    outline.pts[outline.ptsCnt] = mathTransform(to, transform);
+    outline.types[outline.ptsCnt] = SW_CURVE_TYPE_POINT;
+    ++outline.ptsCnt;
+}
+
+
+static void _outlineClose(SwOutline& outline)
+{
+    uint32_t i = 0;
+
+    if (outline.cntrsCnt > 0) {
+        i = outline.cntrs[outline.cntrsCnt - 1] + 1;
+    } else {
+        i = 0;   //First Path
+    }
+
+    //Make sure there is at least one point in the current path
+    if (outline.ptsCnt == i) return;
+
+    //Close the path
+    _growOutlinePoint(outline, 1);
+
+    outline.pts[outline.ptsCnt] = outline.pts[i];
+    outline.types[outline.ptsCnt] = SW_CURVE_TYPE_POINT;
+    ++outline.ptsCnt;
+    outline.closed[outline.cntrsCnt] = true;
+}
+
+
+static void _dashLineTo(SwDashStroke& dash, const Point* to, const Matrix* transform)
+{
+    _growOutlinePoint(*dash.outline, dash.outline->ptsCnt >> 1);
+    _growOutlineContour(*dash.outline, dash.outline->cntrsCnt >> 1);
+
+    Line cur = {dash.ptCur, *to};
+    auto len = _lineLength(cur.pt1, cur.pt2);
+
+    if (len < dash.curLen) {
+        dash.curLen -= len;
+        if (!dash.curOpGap) {
+            _outlineMoveTo(*dash.outline, &dash.ptCur, transform);
+            _outlineLineTo(*dash.outline, to, transform);
+        }
+    } else {
+        while (len > dash.curLen) {
+            len -= dash.curLen;
+            Line left, right;
+            _lineSplitAt(cur, dash.curLen, left, right);;
+            dash.curIdx = (dash.curIdx + 1) % dash.cnt;
+            if (!dash.curOpGap) {
+                _outlineMoveTo(*dash.outline, &left.pt1, transform);
+                _outlineLineTo(*dash.outline, &left.pt2, transform);
+            }
+            dash.curLen = dash.pattern[dash.curIdx];
+            dash.curOpGap = !dash.curOpGap;
+            cur = right;
+            dash.ptCur = cur.pt1;
+        }
+        //leftovers
+        dash.curLen -= len;
+        if (!dash.curOpGap) {
+            _outlineMoveTo(*dash.outline, &cur.pt1, transform);
+            _outlineLineTo(*dash.outline, &cur.pt2, transform);
+        }
+        if (dash.curLen < 1 && TO_SWCOORD(len) > 1) {
+            //move to next dash
+            dash.curIdx = (dash.curIdx + 1) % dash.cnt;
+            dash.curLen = dash.pattern[dash.curIdx];
+            dash.curOpGap = !dash.curOpGap;
+        }
+    }
+    dash.ptCur = *to;
+}
+
+
+static void _dashCubicTo(SwDashStroke& dash, const Point* ctrl1, const Point* ctrl2, const Point* to, const Matrix* transform)
+{
+    _growOutlinePoint(*dash.outline, dash.outline->ptsCnt >> 1);
+    _growOutlineContour(*dash.outline, dash.outline->cntrsCnt >> 1);
+
+    Bezier cur = {dash.ptCur, *ctrl1, *ctrl2, *to};
+    auto len = bezLength(cur);
+
+    if (len < dash.curLen) {
+        dash.curLen -= len;
+        if (!dash.curOpGap) {
+            _outlineMoveTo(*dash.outline, &dash.ptCur, transform);
+            _outlineCubicTo(*dash.outline, ctrl1, ctrl2, to, transform);
+        }
+    } else {
+        while (len > dash.curLen) {
+            Bezier left, right;
+            len -= dash.curLen;
+            bezSplitAt(cur, dash.curLen, left, right);
+            if (!dash.curOpGap) {
+                // leftovers from a previous command don't require moveTo
+                if (dash.pattern[dash.curIdx] - dash.curLen < FLT_EPSILON) {
+                    _outlineMoveTo(*dash.outline, &left.start, transform);
+                }
+                _outlineCubicTo(*dash.outline, &left.ctrl1, &left.ctrl2, &left.end, transform);
+            }
+            dash.curIdx = (dash.curIdx + 1) % dash.cnt;
+            dash.curLen = dash.pattern[dash.curIdx];
+            dash.curOpGap = !dash.curOpGap;
+            cur = right;
+            dash.ptCur = right.start;
+        }
+        //leftovers
+        dash.curLen -= len;
+        if (!dash.curOpGap) {
+            _outlineMoveTo(*dash.outline, &cur.start, transform);
+            _outlineCubicTo(*dash.outline, &cur.ctrl1, &cur.ctrl2, &cur.end, transform);
+        }
+        if (dash.curLen < 1 && TO_SWCOORD(len) > 1) {
+            //move to next dash
+            dash.curIdx = (dash.curIdx + 1) % dash.cnt;
+            dash.curLen = dash.pattern[dash.curIdx];
+            dash.curOpGap = !dash.curOpGap;
+        }
+    }
+    dash.ptCur = *to;
+}
+
+
+static SwOutline* _genDashOutline(const Shape* sdata, const Matrix* transform)
+{
+    const PathCommand* cmds = nullptr;
+    auto cmdCnt = sdata->pathCommands(&cmds);
+
+    const Point* pts = nullptr;
+    auto ptsCnt = sdata->pathCoords(&pts);
+
+    //No actual shape data
+    if (cmdCnt == 0 || ptsCnt == 0) return nullptr;
+
+    SwDashStroke dash;
+    dash.curIdx = 0;
+    dash.curLen = 0;
+    dash.ptStart = {0, 0};
+    dash.ptCur = {0, 0};
+    dash.curOpGap = false;
+
+    const float* pattern;
+    dash.cnt = sdata->strokeDash(&pattern);
+    if (dash.cnt == 0) return nullptr;
+
+    //OPTMIZE ME: Use mempool???
+    dash.pattern = const_cast<float*>(pattern);
+    dash.outline = static_cast<SwOutline*>(calloc(1, sizeof(SwOutline)));
+
+    //smart reservation
+    auto outlinePtsCnt = 0;
+    auto outlineCntrsCnt = 0;
+
+    for (uint32_t i = 0; i < cmdCnt; ++i) {
+        switch (*(cmds + i)) {
+            case PathCommand::Close: {
+                ++outlinePtsCnt;
+                break;
+            }
+            case PathCommand::MoveTo: {
+                ++outlineCntrsCnt;
+                ++outlinePtsCnt;
+                break;
+            }
+            case PathCommand::LineTo: {
+                ++outlinePtsCnt;
+                break;
+            }
+            case PathCommand::CubicTo: {
+                outlinePtsCnt += 3;
+                break;
+            }
+        }
+    }
+
+    ++outlinePtsCnt;    //for close
+    ++outlineCntrsCnt;  //for end
+
+    //No idea exact count.... Reserve Approximitely 20x...
+    _growOutlinePoint(*dash.outline, outlinePtsCnt * 20);
+    _growOutlineContour(*dash.outline, outlineCntrsCnt * 20);
+
+    while (cmdCnt-- > 0) {
+        switch (*cmds) {
+            case PathCommand::Close: {
+                _dashLineTo(dash, &dash.ptStart, transform);
+                break;
+            }
+            case PathCommand::MoveTo: {
+                //reset the dash
+                dash.curIdx = 0;
+                dash.curLen = *dash.pattern;
+                dash.curOpGap = false;
+                dash.ptStart = dash.ptCur = *pts;
+                ++pts;
+                break;
+            }
+            case PathCommand::LineTo: {
+                _dashLineTo(dash, pts, transform);
+                ++pts;
+                break;
+            }
+            case PathCommand::CubicTo: {
+                _dashCubicTo(dash, pts, pts + 1, pts + 2, transform);
+                pts += 3;
+                break;
+            }
+        }
+        ++cmds;
+    }
+
+    _outlineEnd(*dash.outline);
+
+    return dash.outline;
+}
+
+
+static bool _axisAlignedRect(const SwOutline* outline)
+{
+    //Fast Track: axis-aligned rectangle?
+    if (outline->ptsCnt != 5) return false;
+
+    auto pt1 = outline->pts + 0;
+    auto pt2 = outline->pts + 1;
+    auto pt3 = outline->pts + 2;
+    auto pt4 = outline->pts + 3;
+
+    auto a = SwPoint{pt1->x, pt3->y};
+    auto b = SwPoint{pt3->x, pt1->y};
+
+    if ((*pt2 == a && *pt4 == b) || (*pt2 == b && *pt4 == a)) return true;
+
+    return false;
+}
+
+
+
+static bool _genOutline(SwShape* shape, const Shape* sdata, const Matrix* transform, SwMpool* mpool, unsigned tid, bool hasComposite)
+{
+    const PathCommand* cmds = nullptr;
+    auto cmdCnt = sdata->pathCommands(&cmds);
+
+    const Point* pts = nullptr;
+    auto ptsCnt = sdata->pathCoords(&pts);
+
+    //No actual shape data
+    if (cmdCnt == 0 || ptsCnt == 0) return false;
+
+    //smart reservation
+    auto outlinePtsCnt = 0;
+    auto outlineCntrsCnt = 0;
+    auto closeCnt = 0;
+
+    for (uint32_t i = 0; i < cmdCnt; ++i) {
+        switch (*(cmds + i)) {
+            case PathCommand::Close: {
+                ++outlinePtsCnt;
+                ++closeCnt;
+                break;
+            }
+            case PathCommand::MoveTo: {
+                ++outlineCntrsCnt;
+                ++outlinePtsCnt;
+                break;
+            }
+            case PathCommand::LineTo: {
+                ++outlinePtsCnt;
+                break;
+            }
+            case PathCommand::CubicTo: {
+                outlinePtsCnt += 3;
+                break;
+            }
+        }
+    }
+
+    if (static_cast<uint32_t>(outlinePtsCnt - closeCnt) > ptsCnt) {
+        TVGERR("SW_ENGINE", "Wrong a pair of the commands & points - required(%d), current(%d)", outlinePtsCnt - closeCnt, ptsCnt);
+        return false;
+    }
+
+    ++outlinePtsCnt;    //for close
+    ++outlineCntrsCnt;  //for end
+
+    shape->outline = mpoolReqOutline(mpool, tid);
+    auto outline = shape->outline;
+
+    _growOutlinePoint(*outline, outlinePtsCnt);
+
+     if (_growOutlineContour(*outline, outlineCntrsCnt)) {
+        _reserveOutlineClose(*outline);
+    } else {
+        _resetOutlineClose(*outline);
+    }
+
+    //Generate Outlines
+    while (cmdCnt-- > 0) {
+        switch (*cmds) {
+            case PathCommand::Close: {
+                _outlineClose(*outline);
+                break;
+            }
+            case PathCommand::MoveTo: {
+                _outlineMoveTo(*outline, pts, transform);
+                ++pts;
+                break;
+            }
+            case PathCommand::LineTo: {
+                _outlineLineTo(*outline, pts, transform);
+                ++pts;
+                break;
+            }
+            case PathCommand::CubicTo: {
+                _outlineCubicTo(*outline, pts, pts + 1, pts + 2, transform);
+                pts += 3;
+                break;
+            }
+        }
+        ++cmds;
+    }
+
+    _outlineEnd(*outline);
+
+    outline->fillRule = sdata->fillRule();
+    shape->outline = outline;
+
+    shape->fastTrack = (!hasComposite && _axisAlignedRect(shape->outline));
+    return true;
+}
+
+
+/************************************************************************/
+/* External Class Implementation                                        */
+/************************************************************************/
+
+bool shapePrepare(SwShape* shape, const Shape* sdata, const Matrix* transform,  const SwBBox& clipRegion, SwBBox& renderRegion, SwMpool* mpool, unsigned tid, bool hasComposite)
+{
+    if (!_genOutline(shape, sdata, transform, mpool, tid, hasComposite)) return false;
+    if (!mathUpdateOutlineBBox(shape->outline, clipRegion, renderRegion, shape->fastTrack)) return false;
+
+    //Keep it for Rasterization Region
+    shape->bbox = renderRegion;
+
+    //Check valid region
+    if (renderRegion.max.x - renderRegion.min.x < 1 && renderRegion.max.y - renderRegion.min.y < 1) return false;
+
+    //Check boundary
+    if (renderRegion.min.x >= clipRegion.max.x || renderRegion.min.y >= clipRegion.max.y ||
+        renderRegion.max.x <= clipRegion.min.x || renderRegion.max.y <= clipRegion.min.y) return false;
+
+    return true;
+}
+
+
+bool shapePrepared(const SwShape* shape)
+{
+    return shape->rle ? true : false;
+}
+
+
+bool shapeGenRle(SwShape* shape, TVG_UNUSED const Shape* sdata, bool antiAlias)
+{
+    //FIXME: Should we draw it?
+    //Case: Stroke Line
+    //if (shape.outline->opened) return true;
+
+    //Case A: Fast Track Rectangle Drawing
+    if (shape->fastTrack) return true;
+
+    //Case B: Normal Shape RLE Drawing
+    if ((shape->rle = rleRender(shape->rle, shape->outline, shape->bbox, antiAlias))) return true;
+
+    return false;
+}
+
+
+void shapeDelOutline(SwShape* shape, SwMpool* mpool, uint32_t tid)
+{
+    mpoolRetOutline(mpool, tid);
+    shape->outline = nullptr;
+}
+
+
+void shapeReset(SwShape* shape)
+{
+    rleReset(shape->rle);
+    rleReset(shape->strokeRle);
+    shape->fastTrack = false;
+    shape->bbox.reset();
+}
+
+
+void shapeFree(SwShape* shape)
+{
+    rleFree(shape->rle);
+    shapeDelFill(shape);
+
+    if (shape->stroke) {
+        rleFree(shape->strokeRle);
+        strokeFree(shape->stroke);
+    }
+}
+
+
+void shapeDelStroke(SwShape* shape)
+{
+    if (!shape->stroke) return;
+    rleFree(shape->strokeRle);
+    shape->strokeRle = nullptr;
+    strokeFree(shape->stroke);
+    shape->stroke = nullptr;
+}
+
+
+void shapeResetStroke(SwShape* shape, const Shape* sdata, const Matrix* transform)
+{
+    if (!shape->stroke) shape->stroke = static_cast<SwStroke*>(calloc(1, sizeof(SwStroke)));
+    auto stroke = shape->stroke;
+    if (!stroke) return;
+
+    strokeReset(stroke, sdata, transform);
+    rleReset(shape->strokeRle);
+}
+
+
+bool shapeGenStrokeRle(SwShape* shape, const Shape* sdata, const Matrix* transform, const SwBBox& clipRegion, SwBBox& renderRegion, SwMpool* mpool, unsigned tid)
+{
+    SwOutline* shapeOutline = nullptr;
+    SwOutline* strokeOutline = nullptr;
+    bool freeOutline = false;
+    bool ret = true;
+
+    //Dash Style Stroke
+    if (sdata->strokeDash(nullptr) > 0) {
+        shapeOutline = _genDashOutline(sdata, transform);
+        if (!shapeOutline) return false;
+        freeOutline = true;
+    //Normal Style stroke
+    } else {
+        if (!shape->outline) {
+            if (!_genOutline(shape, sdata, transform, mpool, tid, false)) return false;
+        }
+        shapeOutline = shape->outline;
+    }
+
+    if (!strokeParseOutline(shape->stroke, *shapeOutline)) {
+        ret = false;
+        goto fail;
+    }
+
+    strokeOutline = strokeExportOutline(shape->stroke, mpool, tid);
+
+    if (!mathUpdateOutlineBBox(strokeOutline, clipRegion, renderRegion, false)) {
+        ret = false;
+        goto fail;
+    }
+
+    shape->strokeRle = rleRender(shape->strokeRle, strokeOutline, renderRegion, true);
+
+fail:
+    if (freeOutline) {
+        if (shapeOutline->cntrs) free(shapeOutline->cntrs);
+        if (shapeOutline->pts) free(shapeOutline->pts);
+        if (shapeOutline->types) free(shapeOutline->types);
+        if (shapeOutline->closed) free(shapeOutline->closed);
+        free(shapeOutline);
+    }
+    mpoolRetStrokeOutline(mpool, tid);
+
+    return ret;
+}
+
+
+bool shapeGenFillColors(SwShape* shape, const Fill* fill, const Matrix* transform, SwSurface* surface, uint32_t opacity, bool ctable)
+{
+    return fillGenColorTable(shape->fill, fill, transform, surface, opacity, ctable);
+}
+
+
+bool shapeGenStrokeFillColors(SwShape* shape, const Fill* fill, const Matrix* transform, SwSurface* surface, uint32_t opacity, bool ctable)
+{
+    return fillGenColorTable(shape->stroke->fill, fill, transform, surface, opacity, ctable);
+}
+
+
+void shapeResetFill(SwShape* shape)
+{
+    if (!shape->fill) {
+        shape->fill = static_cast<SwFill*>(calloc(1, sizeof(SwFill)));
+        if (!shape->fill) return;
+    }
+    fillReset(shape->fill);
+}
+
+
+void shapeResetStrokeFill(SwShape* shape)
+{
+    if (!shape->stroke->fill) {
+        shape->stroke->fill = static_cast<SwFill*>(calloc(1, sizeof(SwFill)));
+        if (!shape->stroke->fill) return;
+    }
+    fillReset(shape->stroke->fill);
+}
+
+
+void shapeDelFill(SwShape* shape)
+{
+    if (!shape->fill) return;
+    fillFree(shape->fill);
+    shape->fill = nullptr;
+}
+
+
+void shapeDelStrokeFill(SwShape* shape)
+{
+    if (!shape->stroke->fill) return;
+    fillFree(shape->stroke->fill);
+    shape->stroke->fill = nullptr;
+}