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a8c0030d80
Dashed curves require greater precision in calculating their lengths and while splitting Bezier curves. Otherwise, it results in visual discrepancies compared to the expected outcomes. Approximate functions 'bezLengthApprox' and 'bezAtApprox' used for calculations in the lottie loader. issue: https://github.com/thorvg/thorvg/issues/1686
652 lines
19 KiB
C++
652 lines
19 KiB
C++
/*
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* Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "tvgSwCommon.h"
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#include "tvgMath.h"
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#include "tvgBezier.h"
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/************************************************************************/
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/* Internal Class Implementation */
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/************************************************************************/
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struct Line
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{
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Point pt1;
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Point pt2;
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};
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static float _lineLength(const Point& pt1, const Point& pt2)
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{
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Point diff = {pt2.x - pt1.x, pt2.y - pt1.y};
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return sqrtf(diff.x * diff.x + diff.y * diff.y);
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}
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static void _lineSplitAt(const Line& cur, float at, Line& left, Line& right)
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{
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auto len = _lineLength(cur.pt1, cur.pt2);
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auto dx = ((cur.pt2.x - cur.pt1.x) / len) * at;
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auto dy = ((cur.pt2.y - cur.pt1.y) / len) * at;
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left.pt1 = cur.pt1;
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left.pt2.x = left.pt1.x + dx;
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left.pt2.y = left.pt1.y + dy;
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right.pt1 = left.pt2;
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right.pt2 = cur.pt2;
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}
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static void _outlineEnd(SwOutline& outline)
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{
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if (outline.pts.empty()) return;
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outline.cntrs.push(outline.pts.count - 1);
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outline.closed.push(false);
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}
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static void _outlineMoveTo(SwOutline& outline, const Point* to, const Matrix* transform)
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{
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if (outline.pts.count > 0) {
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outline.cntrs.push(outline.pts.count - 1);
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outline.closed.push(false);
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}
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outline.pts.push(mathTransform(to, transform));
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outline.types.push(SW_CURVE_TYPE_POINT);
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}
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static void _outlineLineTo(SwOutline& outline, const Point* to, const Matrix* transform)
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{
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outline.pts.push(mathTransform(to, transform));
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outline.types.push(SW_CURVE_TYPE_POINT);
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}
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static void _outlineCubicTo(SwOutline& outline, const Point* ctrl1, const Point* ctrl2, const Point* to, const Matrix* transform)
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{
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outline.pts.push(mathTransform(ctrl1, transform));
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outline.types.push(SW_CURVE_TYPE_CUBIC);
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outline.pts.push(mathTransform(ctrl2, transform));
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outline.types.push(SW_CURVE_TYPE_CUBIC);
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outline.pts.push(mathTransform(to, transform));
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outline.types.push(SW_CURVE_TYPE_POINT);
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}
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static void _outlineClose(SwOutline& outline)
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{
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uint32_t i = 0;
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if (outline.cntrs.count > 0) i = outline.cntrs.last() + 1;
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else i = 0; //First Path
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//Make sure there is at least one point in the current path
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if (outline.pts.count == i) return;
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//Close the path
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outline.pts.push(outline.pts[i]);
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outline.types.push(SW_CURVE_TYPE_POINT);
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outline.closed.push(true);
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}
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static void _dashLineTo(SwDashStroke& dash, const Point* to, const Matrix* transform)
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{
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Line cur = {dash.ptCur, *to};
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auto len = _lineLength(cur.pt1, cur.pt2);
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if (mathZero(len)) {
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_outlineMoveTo(*dash.outline, &dash.ptCur, transform);
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} else if (len < dash.curLen) {
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dash.curLen -= len;
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if (!dash.curOpGap) {
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if (dash.move) {
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_outlineMoveTo(*dash.outline, &dash.ptCur, transform);
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dash.move = false;
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}
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_outlineLineTo(*dash.outline, to, transform);
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}
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} else {
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while (len - dash.curLen > 0.0001f) {
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Line left, right;
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if (dash.curLen > 0) {
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len -= dash.curLen;
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_lineSplitAt(cur, dash.curLen, left, right);
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if (!dash.curOpGap) {
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if (dash.move || dash.pattern[dash.curIdx] - dash.curLen < FLT_EPSILON) {
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_outlineMoveTo(*dash.outline, &left.pt1, transform);
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dash.move = false;
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}
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_outlineLineTo(*dash.outline, &left.pt2, transform);
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}
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} else {
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right = cur;
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}
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dash.curIdx = (dash.curIdx + 1) % dash.cnt;
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dash.curLen = dash.pattern[dash.curIdx];
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dash.curOpGap = !dash.curOpGap;
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cur = right;
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dash.ptCur = cur.pt1;
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dash.move = true;
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}
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//leftovers
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dash.curLen -= len;
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if (!dash.curOpGap) {
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if (dash.move) {
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_outlineMoveTo(*dash.outline, &cur.pt1, transform);
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dash.move = false;
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}
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_outlineLineTo(*dash.outline, &cur.pt2, transform);
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}
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if (dash.curLen < 1 && TO_SWCOORD(len) > 1) {
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//move to next dash
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dash.curIdx = (dash.curIdx + 1) % dash.cnt;
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dash.curLen = dash.pattern[dash.curIdx];
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dash.curOpGap = !dash.curOpGap;
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}
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}
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dash.ptCur = *to;
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}
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static void _dashCubicTo(SwDashStroke& dash, const Point* ctrl1, const Point* ctrl2, const Point* to, const Matrix* transform)
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{
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Bezier cur = {dash.ptCur, *ctrl1, *ctrl2, *to};
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auto len = bezLength(cur);
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if (mathZero(len)) {
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_outlineMoveTo(*dash.outline, &dash.ptCur, transform);
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} else if (len < dash.curLen) {
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dash.curLen -= len;
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if (!dash.curOpGap) {
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if (dash.move) {
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_outlineMoveTo(*dash.outline, &dash.ptCur, transform);
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dash.move = false;
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}
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_outlineCubicTo(*dash.outline, ctrl1, ctrl2, to, transform);
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}
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} else {
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while ((len - dash.curLen) > 0.0001f) {
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Bezier left, right;
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if (dash.curLen > 0) {
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len -= dash.curLen;
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bezSplitAt(cur, dash.curLen, left, right);
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if (!dash.curOpGap) {
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if (dash.move || dash.pattern[dash.curIdx] - dash.curLen < FLT_EPSILON) {
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_outlineMoveTo(*dash.outline, &left.start, transform);
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dash.move = false;
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}
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_outlineCubicTo(*dash.outline, &left.ctrl1, &left.ctrl2, &left.end, transform);
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}
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} else {
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right = cur;
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}
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dash.curIdx = (dash.curIdx + 1) % dash.cnt;
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dash.curLen = dash.pattern[dash.curIdx];
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dash.curOpGap = !dash.curOpGap;
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cur = right;
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dash.ptCur = right.start;
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dash.move = true;
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}
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//leftovers
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dash.curLen -= len;
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if (!dash.curOpGap) {
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if (dash.move) {
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_outlineMoveTo(*dash.outline, &cur.start, transform);
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dash.move = false;
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}
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_outlineCubicTo(*dash.outline, &cur.ctrl1, &cur.ctrl2, &cur.end, transform);
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}
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if (dash.curLen < 1 && TO_SWCOORD(len) > 1) {
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//move to next dash
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dash.curIdx = (dash.curIdx + 1) % dash.cnt;
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dash.curLen = dash.pattern[dash.curIdx];
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dash.curOpGap = !dash.curOpGap;
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}
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}
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dash.ptCur = *to;
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}
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static void _dashClose(SwDashStroke& dash, const Matrix* transform)
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{
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_dashLineTo(dash, &dash.ptStart, transform);
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}
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static void _dashMoveTo(SwDashStroke& dash, uint32_t offIdx, float offset, const Point* pts, const Matrix* transform)
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{
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dash.curIdx = offIdx % dash.cnt;
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dash.curLen = dash.pattern[dash.curIdx] - offset;
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dash.curOpGap = offIdx % 2;
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dash.ptStart = dash.ptCur = *pts;
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dash.move = true;
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}
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static SwOutline* _genDashOutline(const RenderShape* rshape, const Matrix* transform, float length, SwMpool* mpool, unsigned tid)
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{
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const PathCommand* cmds = rshape->path.cmds.data;
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auto cmdCnt = rshape->path.cmds.count;
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const Point* pts = rshape->path.pts.data;
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auto ptsCnt = rshape->path.pts.count;
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//No actual shape data
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if (cmdCnt == 0 || ptsCnt == 0) return nullptr;
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SwDashStroke dash;
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auto offset = 0.0f;
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auto trimmed = false;
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dash.cnt = rshape->strokeDash((const float**)&dash.pattern, &offset);
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//dash by trimming.
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if (length > 0.0f && dash.cnt == 0) {
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auto begin = length * rshape->stroke->trim.begin;
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auto end = length * rshape->stroke->trim.end;
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//TODO: mix trimming + dash style
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//default
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if (end > begin) {
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if (begin > 0) dash.cnt += 4;
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else dash.cnt += 2;
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//looping
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} else dash.cnt += 3;
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dash.pattern = (float*)malloc(sizeof(float) * dash.cnt);
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if (dash.cnt == 2) {
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dash.pattern[0] = end - begin;
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dash.pattern[1] = length - (end - begin);
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} else if (dash.cnt == 3) {
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dash.pattern[0] = end;
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dash.pattern[1] = (begin - end);
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dash.pattern[2] = length - begin;
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} else {
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dash.pattern[0] = 0; //zero dash to start with a space.
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dash.pattern[1] = begin;
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dash.pattern[2] = end - begin;
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dash.pattern[3] = length - (end - begin);
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}
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trimmed = true;
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//just a dasy style.
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} else {
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if (dash.cnt == 0) return nullptr;
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}
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//offset?
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auto patternLength = 0.0f;
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uint32_t offIdx = 0;
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if (!mathZero(offset)) {
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for (size_t i = 0; i < dash.cnt; ++i) patternLength += dash.pattern[i];
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bool isOdd = dash.cnt % 2;
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if (isOdd) patternLength *= 2;
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offset = fmod(offset, patternLength);
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if (offset < 0) offset += patternLength;
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for (size_t i = 0; i < dash.cnt * (1 + (size_t)isOdd); ++i, ++offIdx) {
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auto curPattern = dash.pattern[i % dash.cnt];
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if (offset < curPattern) break;
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offset -= curPattern;
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}
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}
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dash.outline = mpoolReqDashOutline(mpool, tid);
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while (cmdCnt-- > 0) {
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switch (*cmds) {
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case PathCommand::Close: {
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_dashClose(dash, transform);
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break;
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}
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case PathCommand::MoveTo: {
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_dashMoveTo(dash, offIdx, offset, pts, transform);
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++pts;
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break;
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}
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case PathCommand::LineTo: {
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_dashLineTo(dash, pts, transform);
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++pts;
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break;
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}
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case PathCommand::CubicTo: {
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_dashCubicTo(dash, pts, pts + 1, pts + 2, transform);
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pts += 3;
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break;
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}
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}
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++cmds;
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}
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_outlineEnd(*dash.outline);
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if (trimmed) free(dash.pattern);
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return dash.outline;
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}
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static float _outlineLength(const RenderShape* rshape)
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{
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const PathCommand* cmds = rshape->path.cmds.data;
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auto cmdCnt = rshape->path.cmds.count;
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const Point* pts = rshape->path.pts.data;
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auto ptsCnt = rshape->path.pts.count;
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//No actual shape data
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if (cmdCnt == 0 || ptsCnt == 0) return 0.0f;
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const Point* close = nullptr;
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auto length = 0.0f;
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//Compute the whole length
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while (cmdCnt-- > 0) {
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switch (*cmds) {
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case PathCommand::Close: {
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length += mathLength(pts - 1, close);
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++pts;
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break;
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}
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case PathCommand::MoveTo: {
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close = pts;
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++pts;
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break;
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}
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case PathCommand::LineTo: {
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length += mathLength(pts - 1, pts);
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++pts;
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break;
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}
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case PathCommand::CubicTo: {
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length += bezLengthApprox({*(pts - 1), *pts, *(pts + 1), *(pts + 2)});
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pts += 3;
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break;
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}
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}
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++cmds;
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}
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return length;
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}
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static bool _axisAlignedRect(const SwOutline* outline)
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{
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//Fast Track: axis-aligned rectangle?
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if (outline->pts.count != 5) return false;
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auto pt1 = outline->pts.data + 0;
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auto pt2 = outline->pts.data + 1;
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auto pt3 = outline->pts.data + 2;
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auto pt4 = outline->pts.data + 3;
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auto a = SwPoint{pt1->x, pt3->y};
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auto b = SwPoint{pt3->x, pt1->y};
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if ((*pt2 == a && *pt4 == b) || (*pt2 == b && *pt4 == a)) return true;
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return false;
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}
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static bool _genOutline(SwShape* shape, const RenderShape* rshape, const Matrix* transform, SwMpool* mpool, unsigned tid, bool hasComposite)
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{
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const PathCommand* cmds = rshape->path.cmds.data;
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auto cmdCnt = rshape->path.cmds.count;
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const Point* pts = rshape->path.pts.data;
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auto ptsCnt = rshape->path.pts.count;
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//No actual shape data
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if (cmdCnt == 0 || ptsCnt == 0) return false;
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shape->outline = mpoolReqOutline(mpool, tid);
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auto outline = shape->outline;
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//Generate Outlines
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while (cmdCnt-- > 0) {
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switch (*cmds) {
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case PathCommand::Close: {
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_outlineClose(*outline);
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break;
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}
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case PathCommand::MoveTo: {
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_outlineMoveTo(*outline, pts, transform);
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++pts;
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break;
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}
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case PathCommand::LineTo: {
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_outlineLineTo(*outline, pts, transform);
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++pts;
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break;
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}
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case PathCommand::CubicTo: {
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_outlineCubicTo(*outline, pts, pts + 1, pts + 2, transform);
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pts += 3;
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break;
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}
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}
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++cmds;
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}
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_outlineEnd(*outline);
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outline->fillRule = rshape->rule;
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shape->outline = outline;
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shape->fastTrack = (!hasComposite && _axisAlignedRect(shape->outline));
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return true;
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}
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/************************************************************************/
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/* External Class Implementation */
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/************************************************************************/
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bool shapePrepare(SwShape* shape, const RenderShape* rshape, const Matrix* transform, const SwBBox& clipRegion, SwBBox& renderRegion, SwMpool* mpool, unsigned tid, bool hasComposite)
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{
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if (!_genOutline(shape, rshape, transform, mpool, tid, hasComposite)) return false;
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if (!mathUpdateOutlineBBox(shape->outline, clipRegion, renderRegion, shape->fastTrack)) return false;
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//Keep it for Rasterization Region
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shape->bbox = renderRegion;
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//Check valid region
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if (renderRegion.max.x - renderRegion.min.x < 1 && renderRegion.max.y - renderRegion.min.y < 1) return false;
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//Check boundary
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if (renderRegion.min.x >= clipRegion.max.x || renderRegion.min.y >= clipRegion.max.y ||
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renderRegion.max.x <= clipRegion.min.x || renderRegion.max.y <= clipRegion.min.y) return false;
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return true;
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}
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bool shapePrepared(const SwShape* shape)
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{
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return shape->rle ? true : false;
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}
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bool shapeGenRle(SwShape* shape, TVG_UNUSED const RenderShape* rshape, bool antiAlias)
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{
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//FIXME: Should we draw it?
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//Case: Stroke Line
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//if (shape.outline->opened) return true;
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//Case A: Fast Track Rectangle Drawing
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if (shape->fastTrack) return true;
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//Case B: Normal Shape RLE Drawing
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if ((shape->rle = rleRender(shape->rle, shape->outline, shape->bbox, antiAlias))) return true;
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return false;
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}
|
|
|
|
|
|
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);
|
|
shape->rle = nullptr;
|
|
|
|
shapeDelFill(shape);
|
|
|
|
if (shape->stroke) {
|
|
rleFree(shape->strokeRle);
|
|
shape->strokeRle = nullptr;
|
|
strokeFree(shape->stroke);
|
|
shape->stroke = nullptr;
|
|
}
|
|
}
|
|
|
|
|
|
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 RenderShape* rshape, const Matrix* transform)
|
|
{
|
|
if (!shape->stroke) shape->stroke = static_cast<SwStroke*>(calloc(1, sizeof(SwStroke)));
|
|
auto stroke = shape->stroke;
|
|
if (!stroke) return;
|
|
|
|
strokeReset(stroke, rshape, transform);
|
|
rleReset(shape->strokeRle);
|
|
}
|
|
|
|
|
|
bool shapeGenStrokeRle(SwShape* shape, const RenderShape* rshape, const Matrix* transform, const SwBBox& clipRegion, SwBBox& renderRegion, SwMpool* mpool, unsigned tid)
|
|
{
|
|
SwOutline* shapeOutline = nullptr;
|
|
SwOutline* strokeOutline = nullptr;
|
|
auto dashStroking = false;
|
|
auto ret = true;
|
|
|
|
auto length = rshape->strokeTrim() ? _outlineLength(rshape) : 0.0f;
|
|
|
|
//Dash style (+trimming)
|
|
if (rshape->stroke->dashCnt > 0 || length > 0) {
|
|
shapeOutline = _genDashOutline(rshape, transform, length, mpool, tid);
|
|
if (!shapeOutline) return false;
|
|
dashStroking = true;
|
|
//Normal style
|
|
} else {
|
|
if (!shape->outline) {
|
|
if (!_genOutline(shape, rshape, transform, mpool, tid, false)) return false;
|
|
}
|
|
shapeOutline = shape->outline;
|
|
}
|
|
|
|
if (!strokeParseOutline(shape->stroke, *shapeOutline)) {
|
|
ret = false;
|
|
goto clear;
|
|
}
|
|
|
|
strokeOutline = strokeExportOutline(shape->stroke, mpool, tid);
|
|
|
|
if (!mathUpdateOutlineBBox(strokeOutline, clipRegion, renderRegion, false)) {
|
|
ret = false;
|
|
goto clear;
|
|
}
|
|
|
|
shape->strokeRle = rleRender(shape->strokeRle, strokeOutline, renderRegion, true);
|
|
|
|
clear:
|
|
if (dashStroking) mpoolRetDashOutline(mpool, tid);
|
|
mpoolRetStrokeOutline(mpool, tid);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
bool shapeGenFillColors(SwShape* shape, const Fill* fill, const Matrix* transform, SwSurface* surface, uint8_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, uint8_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;
|
|
}
|