mirror of
https://github.com/thorvg/thorvg.git
synced 2025-06-08 05:33:36 +00:00
1f996c1382
There are differences in behavior compared to the SVG spec, especially when consecutive line drawings occur without a moveTo command following a closePath command. Actually, thorvg didn't care the behavior in that scenario, this update ensures the scenario is handled correctly to align with the SVG specification. issue: https://github.com/thorvg/thorvg/issues/1487
643 lines
19 KiB
C++
643 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 "tvgLines.h"
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/************************************************************************/
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/* Internal Class Implementation */
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/************************************************************************/
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static bool _outlineJump(SwOutline& outline)
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{
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//Make a contour if lineTo/curveTo without calling close/moveTo beforehand.
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if (!outline.pts.empty()) {
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outline.cntrs.push(outline.pts.count - 1);
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outline.pts.push(outline.pts[outline.cntrs.last()]);
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outline.types.push(SW_CURVE_TYPE_POINT);
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}
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return false;
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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 bool _outlineClose(SwOutline& outline)
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{
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uint32_t i;
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if (outline.cntrs.count > 0) i = outline.cntrs.last() + 1;
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else i = 0;
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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 false;
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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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return 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 = fmodf(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 += bezLength({*(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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bool closed = false;
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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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if (!closed) closed = _outlineClose(*outline);
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break;
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}
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case PathCommand::MoveTo: {
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if (closed) closed = false;
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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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if (closed) closed = _outlineJump(*outline);
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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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if (closed) closed = _outlineJump(*outline);
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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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}
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void shapeDelOutline(SwShape* shape, SwMpool* mpool, uint32_t tid)
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{
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mpoolRetOutline(mpool, tid);
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shape->outline = nullptr;
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}
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void shapeReset(SwShape* shape)
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{
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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;
|
|
}
|