mirror of
https://github.com/mozilla/gecko-dev.git
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398 lines
11 KiB
C++
398 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "PathRecording.h"
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#include "DrawEventRecorder.h"
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#include "RecordedEventImpl.h"
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namespace mozilla {
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namespace gfx {
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#define NEXT_PARAMS(_type) \
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const _type params = *reinterpret_cast<const _type*>(nextByte); \
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nextByte += sizeof(_type);
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bool PathOps::StreamToSink(PathSink& aPathSink) const {
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if (mPathData.empty()) {
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return true;
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}
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const uint8_t* nextByte = mPathData.data();
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const uint8_t* end = nextByte + mPathData.size();
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while (nextByte < end) {
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const OpType opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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switch (opType) {
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case OpType::OP_MOVETO: {
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NEXT_PARAMS(Point)
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aPathSink.MoveTo(params);
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break;
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}
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case OpType::OP_LINETO: {
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NEXT_PARAMS(Point)
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aPathSink.LineTo(params);
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break;
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}
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case OpType::OP_BEZIERTO: {
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NEXT_PARAMS(ThreePoints)
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aPathSink.BezierTo(params.p1, params.p2, params.p3);
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break;
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}
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case OpType::OP_QUADRATICBEZIERTO: {
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NEXT_PARAMS(TwoPoints)
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aPathSink.QuadraticBezierTo(params.p1, params.p2);
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break;
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}
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case OpType::OP_ARC: {
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NEXT_PARAMS(ArcParams)
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aPathSink.Arc(params.origin, params.radius, params.startAngle,
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params.endAngle, params.antiClockwise);
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break;
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}
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case OpType::OP_CLOSE:
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aPathSink.Close();
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break;
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default:
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return false;
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}
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}
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return true;
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}
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#define CHECKED_NEXT_PARAMS(_type) \
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if (nextByte + sizeof(_type) > end) { \
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return false; \
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} \
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NEXT_PARAMS(_type)
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bool PathOps::CheckedStreamToSink(PathSink& aPathSink) const {
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if (mPathData.empty()) {
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return true;
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}
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const uint8_t* nextByte = mPathData.data();
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const uint8_t* end = nextByte + mPathData.size();
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while (true) {
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if (nextByte == end) {
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break;
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}
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if (nextByte + sizeof(OpType) > end) {
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return false;
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}
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const OpType opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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switch (opType) {
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case OpType::OP_MOVETO: {
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CHECKED_NEXT_PARAMS(Point)
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aPathSink.MoveTo(params);
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break;
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}
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case OpType::OP_LINETO: {
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CHECKED_NEXT_PARAMS(Point)
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aPathSink.LineTo(params);
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break;
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}
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case OpType::OP_BEZIERTO: {
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CHECKED_NEXT_PARAMS(ThreePoints)
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aPathSink.BezierTo(params.p1, params.p2, params.p3);
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break;
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}
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case OpType::OP_QUADRATICBEZIERTO: {
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CHECKED_NEXT_PARAMS(TwoPoints)
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aPathSink.QuadraticBezierTo(params.p1, params.p2);
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break;
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}
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case OpType::OP_ARC: {
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CHECKED_NEXT_PARAMS(ArcParams)
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aPathSink.Arc(params.origin, params.radius, params.startAngle,
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params.endAngle, params.antiClockwise);
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break;
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}
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case OpType::OP_CLOSE:
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aPathSink.Close();
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break;
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default:
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return false;
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}
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}
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return true;
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}
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#undef CHECKED_NEXT_PARAMS
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PathOps PathOps::TransformedCopy(const Matrix& aTransform) const {
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PathOps newPathOps;
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const uint8_t* nextByte = mPathData.data();
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const uint8_t* end = nextByte + mPathData.size();
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while (nextByte < end) {
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const OpType opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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switch (opType) {
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case OpType::OP_MOVETO: {
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NEXT_PARAMS(Point)
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newPathOps.MoveTo(aTransform.TransformPoint(params));
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break;
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}
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case OpType::OP_LINETO: {
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NEXT_PARAMS(Point)
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newPathOps.LineTo(aTransform.TransformPoint(params));
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break;
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}
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case OpType::OP_BEZIERTO: {
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NEXT_PARAMS(ThreePoints)
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newPathOps.BezierTo(aTransform.TransformPoint(params.p1),
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aTransform.TransformPoint(params.p2),
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aTransform.TransformPoint(params.p3));
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break;
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}
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case OpType::OP_QUADRATICBEZIERTO: {
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NEXT_PARAMS(TwoPoints)
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newPathOps.QuadraticBezierTo(aTransform.TransformPoint(params.p1),
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aTransform.TransformPoint(params.p2));
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break;
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}
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case OpType::OP_ARC: {
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NEXT_PARAMS(ArcParams)
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ArcToBezier(&newPathOps, params.origin,
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gfx::Size(params.radius, params.radius), params.startAngle,
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params.endAngle, params.antiClockwise, 0.0f, aTransform);
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break;
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}
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case OpType::OP_CLOSE:
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newPathOps.Close();
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break;
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default:
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MOZ_CRASH("We control mOpTypes, so this should never happen.");
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}
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}
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return newPathOps;
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}
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Maybe<Circle> PathOps::AsCircle() const {
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if (mPathData.empty()) {
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return Nothing();
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}
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const uint8_t* nextByte = mPathData.data();
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const uint8_t* end = nextByte + mPathData.size();
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const OpType opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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if (opType == OpType::OP_ARC) {
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NEXT_PARAMS(ArcParams)
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if (fabs(fabs(params.startAngle - params.endAngle) - 2 * M_PI) < 1e-6) {
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// we have a full circle
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if (nextByte < end) {
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const OpType nextOpType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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if (nextOpType == OpType::OP_CLOSE) {
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if (nextByte == end) {
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return Some(Circle{params.origin, params.radius, true});
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}
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}
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} else {
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// the circle wasn't closed
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return Some(Circle{params.origin, params.radius, false});
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}
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}
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}
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return Nothing();
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}
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Maybe<Line> PathOps::AsLine() const {
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if (mPathData.empty()) {
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return Nothing();
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}
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Line retval;
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const uint8_t* nextByte = mPathData.data();
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const uint8_t* end = nextByte + mPathData.size();
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OpType opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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if (opType == OpType::OP_MOVETO) {
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MOZ_ASSERT(nextByte != end);
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NEXT_PARAMS(Point)
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retval.origin = params;
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} else {
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return Nothing();
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}
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if (nextByte >= end) {
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return Nothing();
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}
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opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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if (opType == OpType::OP_LINETO) {
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MOZ_ASSERT(nextByte != end);
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NEXT_PARAMS(Point)
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if (nextByte == end) {
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retval.destination = params;
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return Some(retval);
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}
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}
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return Nothing();
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}
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#undef NEXT_PARAMS
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size_t PathOps::NumberOfOps() const {
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size_t size = 0;
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const uint8_t* nextByte = mPathData.data();
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const uint8_t* end = nextByte + mPathData.size();
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while (nextByte < end) {
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size++;
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const OpType opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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switch (opType) {
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case OpType::OP_MOVETO:
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nextByte += sizeof(Point);
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break;
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case OpType::OP_LINETO:
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nextByte += sizeof(Point);
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break;
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case OpType::OP_BEZIERTO:
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nextByte += sizeof(ThreePoints);
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break;
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case OpType::OP_QUADRATICBEZIERTO:
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nextByte += sizeof(TwoPoints);
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break;
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case OpType::OP_ARC:
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nextByte += sizeof(ArcParams);
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break;
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case OpType::OP_CLOSE:
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break;
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default:
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MOZ_CRASH("We control mOpTypes, so this should never happen.");
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}
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}
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return size;
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}
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bool PathOps::IsEmpty() const {
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const uint8_t* nextByte = mPathData.data();
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const uint8_t* end = nextByte + mPathData.size();
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while (nextByte < end) {
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const OpType opType = *reinterpret_cast<const OpType*>(nextByte);
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nextByte += sizeof(OpType);
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switch (opType) {
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case OpType::OP_MOVETO:
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nextByte += sizeof(Point);
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break;
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case OpType::OP_CLOSE:
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break;
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default:
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return false;
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}
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}
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return true;
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}
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void PathBuilderRecording::MoveTo(const Point& aPoint) {
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mPathOps.MoveTo(aPoint);
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mBeginPoint = aPoint;
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mCurrentPoint = aPoint;
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}
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void PathBuilderRecording::LineTo(const Point& aPoint) {
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mPathOps.LineTo(aPoint);
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mCurrentPoint = aPoint;
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}
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void PathBuilderRecording::BezierTo(const Point& aCP1, const Point& aCP2,
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const Point& aCP3) {
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mPathOps.BezierTo(aCP1, aCP2, aCP3);
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mCurrentPoint = aCP3;
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}
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void PathBuilderRecording::QuadraticBezierTo(const Point& aCP1,
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const Point& aCP2) {
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mPathOps.QuadraticBezierTo(aCP1, aCP2);
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mCurrentPoint = aCP2;
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}
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void PathBuilderRecording::Close() {
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mPathOps.Close();
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mCurrentPoint = mBeginPoint;
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}
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void PathBuilderRecording::Arc(const Point& aOrigin, float aRadius,
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float aStartAngle, float aEndAngle,
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bool aAntiClockwise) {
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mPathOps.Arc(aOrigin, aRadius, aStartAngle, aEndAngle, aAntiClockwise);
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mCurrentPoint = aOrigin + Point(cosf(aEndAngle), sinf(aEndAngle)) * aRadius;
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}
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already_AddRefed<Path> PathBuilderRecording::Finish() {
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return MakeAndAddRef<PathRecording>(mBackendType, std::move(mPathOps),
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mFillRule, mCurrentPoint, mBeginPoint);
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}
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PathRecording::PathRecording(BackendType aBackend, PathOps&& aOps,
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FillRule aFillRule, const Point& aCurrentPoint,
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const Point& aBeginPoint)
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: mBackendType(aBackend),
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mPathOps(std::move(aOps)),
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mFillRule(aFillRule),
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mCurrentPoint(aCurrentPoint),
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mBeginPoint(aBeginPoint) {}
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PathRecording::~PathRecording() {
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for (size_t i = 0; i < mStoredRecorders.size(); i++) {
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mStoredRecorders[i]->RemoveStoredObject(this);
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mStoredRecorders[i]->RecordEvent(RecordedPathDestruction(this));
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}
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}
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void PathRecording::EnsurePath() const {
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if (mPath) {
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return;
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}
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if (RefPtr<PathBuilder> pathBuilder =
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Factory::CreatePathBuilder(mBackendType, mFillRule)) {
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if (!mPathOps.StreamToSink(*pathBuilder)) {
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MOZ_ASSERT(false, "Failed to stream PathOps to PathBuilder");
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} else {
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mPath = pathBuilder->Finish();
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MOZ_ASSERT(!!mPath, "Failed finishing Path from PathBuilder");
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}
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} else {
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MOZ_ASSERT(false, "Failed to create PathBuilder for PathRecording");
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}
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}
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already_AddRefed<PathBuilder> PathRecording::CopyToBuilder(
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FillRule aFillRule) const {
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RefPtr<PathBuilderRecording> recording =
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new PathBuilderRecording(mBackendType, PathOps(mPathOps), aFillRule);
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recording->SetCurrentPoint(mCurrentPoint);
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recording->SetBeginPoint(mBeginPoint);
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return recording.forget();
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}
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already_AddRefed<PathBuilder> PathRecording::TransformedCopyToBuilder(
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const Matrix& aTransform, FillRule aFillRule) const {
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RefPtr<PathBuilderRecording> recording = new PathBuilderRecording(
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mBackendType, mPathOps.TransformedCopy(aTransform), aFillRule);
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recording->SetCurrentPoint(aTransform.TransformPoint(mCurrentPoint));
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recording->SetBeginPoint(aTransform.TransformPoint(mBeginPoint));
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return recording.forget();
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}
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} // namespace gfx
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} // namespace mozilla
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