mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-08-15 02:29:04 +00:00
492 lines
18 KiB
C++
492 lines
18 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* implementation of nsISMILType for use by <animateMotion> element */
|
|
|
|
#include "SVGMotionSMILType.h"
|
|
|
|
#include "gfx2DGlue.h"
|
|
#include "mozilla/gfx/Point.h"
|
|
#include "nsSMILValue.h"
|
|
#include "nsDebug.h"
|
|
#include "nsMathUtils.h"
|
|
#include "nsISupportsUtils.h"
|
|
#include "nsTArray.h"
|
|
#include <math.h>
|
|
|
|
using namespace mozilla::gfx;
|
|
|
|
namespace mozilla {
|
|
|
|
/*static*/ SVGMotionSMILType SVGMotionSMILType::sSingleton;
|
|
|
|
|
|
// Helper enum, for distinguishing between types of MotionSegment structs
|
|
enum SegmentType {
|
|
eSegmentType_Translation,
|
|
eSegmentType_PathPoint
|
|
};
|
|
|
|
// Helper Structs: containers for params to define our MotionSegment
|
|
// (either simple translation or point-on-a-path)
|
|
struct TranslationParams { // Simple translation
|
|
float mX;
|
|
float mY;
|
|
};
|
|
struct PathPointParams { // Point along a path
|
|
// Refcounted: need to AddRef/Release. This can't be an nsRefPtr because
|
|
// this struct is used inside a union so it can't have a default constructor.
|
|
Path* MOZ_OWNING_REF mPath;
|
|
float mDistToPoint; // Distance from path start to the point on the path that
|
|
// we're interested in.
|
|
};
|
|
|
|
/**
|
|
* Helper Struct: MotionSegment
|
|
*
|
|
* Instances of this class represent the points that we move between during
|
|
* <animateMotion>. Each nsSMILValue will get a nsTArray of these (generally
|
|
* with at most 1 entry in the array, except for in SandwichAdd). (This
|
|
* matches our behavior in nsSVGTransformSMILType.)
|
|
*
|
|
* NOTE: In general, MotionSegments are represented as points on a path
|
|
* (eSegmentType_PathPoint), so that we can easily interpolate and compute
|
|
* distance *along their path*. However, Add() outputs MotionSegments as
|
|
* simple translations (eSegmentType_Translation), because adding two points
|
|
* from a path (e.g. when accumulating a repeated animation) will generally
|
|
* take you to an arbitrary point *off* of the path.
|
|
*/
|
|
struct MotionSegment
|
|
{
|
|
// Default constructor just locks us into being a Translation, and leaves
|
|
// other fields uninitialized (since client is presumably about to set them)
|
|
MotionSegment()
|
|
: mSegmentType(eSegmentType_Translation)
|
|
{ }
|
|
|
|
// Constructor for a translation
|
|
MotionSegment(float aX, float aY, float aRotateAngle)
|
|
: mRotateType(eRotateType_Explicit), mRotateAngle(aRotateAngle),
|
|
mSegmentType(eSegmentType_Translation)
|
|
{
|
|
mU.mTranslationParams.mX = aX;
|
|
mU.mTranslationParams.mY = aY;
|
|
}
|
|
|
|
// Constructor for a point on a path (NOTE: AddRef's)
|
|
MotionSegment(Path* aPath, float aDistToPoint,
|
|
RotateType aRotateType, float aRotateAngle)
|
|
: mRotateType(aRotateType), mRotateAngle(aRotateAngle),
|
|
mSegmentType(eSegmentType_PathPoint)
|
|
{
|
|
mU.mPathPointParams.mPath = aPath;
|
|
mU.mPathPointParams.mDistToPoint = aDistToPoint;
|
|
|
|
NS_ADDREF(mU.mPathPointParams.mPath); // Retain a reference to path
|
|
}
|
|
|
|
// Copy constructor (NOTE: AddRef's if we're eSegmentType_PathPoint)
|
|
MotionSegment(const MotionSegment& aOther)
|
|
: mRotateType(aOther.mRotateType), mRotateAngle(aOther.mRotateAngle),
|
|
mSegmentType(aOther.mSegmentType)
|
|
{
|
|
if (mSegmentType == eSegmentType_Translation) {
|
|
mU.mTranslationParams = aOther.mU.mTranslationParams;
|
|
} else { // mSegmentType == eSegmentType_PathPoint
|
|
mU.mPathPointParams = aOther.mU.mPathPointParams;
|
|
NS_ADDREF(mU.mPathPointParams.mPath); // Retain a reference to path
|
|
}
|
|
}
|
|
|
|
// Destructor (releases any reference we were holding onto)
|
|
~MotionSegment()
|
|
{
|
|
if (mSegmentType == eSegmentType_PathPoint) {
|
|
NS_RELEASE(mU.mPathPointParams.mPath);
|
|
}
|
|
}
|
|
|
|
// Comparison operators
|
|
bool operator==(const MotionSegment& aOther) const
|
|
{
|
|
// Compare basic params
|
|
if (mSegmentType != aOther.mSegmentType ||
|
|
mRotateType != aOther.mRotateType ||
|
|
(mRotateType == eRotateType_Explicit && // Technically, angle mismatch
|
|
mRotateAngle != aOther.mRotateAngle)) { // only matters for Explicit.
|
|
return false;
|
|
}
|
|
|
|
// Compare translation params, if we're a translation.
|
|
if (mSegmentType == eSegmentType_Translation) {
|
|
return mU.mTranslationParams.mX == aOther.mU.mTranslationParams.mX &&
|
|
mU.mTranslationParams.mY == aOther.mU.mTranslationParams.mY;
|
|
}
|
|
|
|
// Else, compare path-point params, if we're a path point.
|
|
return (mU.mPathPointParams.mPath == aOther.mU.mPathPointParams.mPath) &&
|
|
(mU.mPathPointParams.mDistToPoint ==
|
|
aOther.mU.mPathPointParams.mDistToPoint);
|
|
}
|
|
|
|
bool operator!=(const MotionSegment& aOther) const
|
|
{
|
|
return !(*this == aOther);
|
|
}
|
|
|
|
// Member Data
|
|
// -----------
|
|
RotateType mRotateType; // Explicit angle vs. auto vs. auto-reverse.
|
|
float mRotateAngle; // Only used if mRotateType == eRotateType_Explicit.
|
|
const SegmentType mSegmentType; // This determines how we interpret
|
|
// mU. (const for safety/sanity)
|
|
|
|
union { // Union to let us hold the params for either segment-type.
|
|
TranslationParams mTranslationParams;
|
|
PathPointParams mPathPointParams;
|
|
} mU;
|
|
};
|
|
|
|
typedef FallibleTArray<MotionSegment> MotionSegmentArray;
|
|
|
|
// Helper methods to cast nsSMILValue.mU.mPtr to the right pointer-type
|
|
static MotionSegmentArray&
|
|
ExtractMotionSegmentArray(nsSMILValue& aValue)
|
|
{
|
|
return *static_cast<MotionSegmentArray*>(aValue.mU.mPtr);
|
|
}
|
|
|
|
static const MotionSegmentArray&
|
|
ExtractMotionSegmentArray(const nsSMILValue& aValue)
|
|
{
|
|
return *static_cast<const MotionSegmentArray*>(aValue.mU.mPtr);
|
|
}
|
|
|
|
// nsISMILType Methods
|
|
// -------------------
|
|
|
|
void
|
|
SVGMotionSMILType::Init(nsSMILValue& aValue) const
|
|
{
|
|
MOZ_ASSERT(aValue.IsNull(), "Unexpected SMIL type");
|
|
|
|
aValue.mType = this;
|
|
aValue.mU.mPtr = new MotionSegmentArray(1);
|
|
}
|
|
|
|
void
|
|
SVGMotionSMILType::Destroy(nsSMILValue& aValue) const
|
|
{
|
|
MOZ_ASSERT(aValue.mType == this, "Unexpected SMIL type");
|
|
|
|
MotionSegmentArray* arr = static_cast<MotionSegmentArray*>(aValue.mU.mPtr);
|
|
delete arr;
|
|
|
|
aValue.mU.mPtr = nullptr;
|
|
aValue.mType = nsSMILNullType::Singleton();
|
|
}
|
|
|
|
nsresult
|
|
SVGMotionSMILType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
|
|
{
|
|
MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
|
|
MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL type");
|
|
|
|
const MotionSegmentArray& srcArr = ExtractMotionSegmentArray(aSrc);
|
|
MotionSegmentArray& dstArr = ExtractMotionSegmentArray(aDest);
|
|
if (!dstArr.Assign(srcArr, fallible)) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
bool
|
|
SVGMotionSMILType::IsEqual(const nsSMILValue& aLeft,
|
|
const nsSMILValue& aRight) const
|
|
{
|
|
MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
|
|
MOZ_ASSERT(aLeft.mType == this, "Unexpected SMIL type");
|
|
|
|
const MotionSegmentArray& leftArr = ExtractMotionSegmentArray(aLeft);
|
|
const MotionSegmentArray& rightArr = ExtractMotionSegmentArray(aRight);
|
|
|
|
// If array-lengths don't match, we're trivially non-equal.
|
|
if (leftArr.Length() != rightArr.Length()) {
|
|
return false;
|
|
}
|
|
|
|
// Array-lengths match -- check each array-entry for equality.
|
|
uint32_t length = leftArr.Length(); // == rightArr->Length(), if we get here
|
|
for (uint32_t i = 0; i < length; ++i) {
|
|
if (leftArr[i] != rightArr[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true; // If we get here, we found no differences.
|
|
}
|
|
|
|
// Helper method for Add & CreateMatrix
|
|
inline static void
|
|
GetAngleAndPointAtDistance(Path* aPath, float aDistance,
|
|
RotateType aRotateType,
|
|
float& aRotateAngle, // in & out-param.
|
|
Point& aPoint) // out-param.
|
|
{
|
|
if (aRotateType == eRotateType_Explicit) {
|
|
// Leave aRotateAngle as-is.
|
|
aPoint = aPath->ComputePointAtLength(aDistance);
|
|
} else {
|
|
Point tangent; // Unit vector tangent to the point we find.
|
|
aPoint = aPath->ComputePointAtLength(aDistance, &tangent);
|
|
float tangentAngle = atan2(tangent.y, tangent.x);
|
|
if (aRotateType == eRotateType_Auto) {
|
|
aRotateAngle = tangentAngle;
|
|
} else {
|
|
MOZ_ASSERT(aRotateType == eRotateType_AutoReverse);
|
|
aRotateAngle = M_PI + tangentAngle;
|
|
}
|
|
}
|
|
}
|
|
|
|
nsresult
|
|
SVGMotionSMILType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
|
|
uint32_t aCount) const
|
|
{
|
|
MOZ_ASSERT(aDest.mType == aValueToAdd.mType,
|
|
"Incompatible SMIL types");
|
|
MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL type");
|
|
|
|
MotionSegmentArray& dstArr = ExtractMotionSegmentArray(aDest);
|
|
const MotionSegmentArray& srcArr = ExtractMotionSegmentArray(aValueToAdd);
|
|
|
|
// We're doing a simple add here (as opposed to a sandwich add below). We
|
|
// only do this when we're accumulating a repeat result.
|
|
// NOTE: In other nsISMILTypes, we use this method with a barely-initialized
|
|
// |aDest| value to assist with "by" animation. (In this case,
|
|
// "barely-initialized" would mean dstArr.Length() would be empty.) However,
|
|
// we don't do this for <animateMotion>, because we instead use our "by"
|
|
// value to construct an equivalent "path" attribute, and we use *that* for
|
|
// our actual animation.
|
|
MOZ_ASSERT(srcArr.Length() == 1, "Invalid source segment arr to add");
|
|
MOZ_ASSERT(dstArr.Length() == 1, "Invalid dest segment arr to add to");
|
|
const MotionSegment& srcSeg = srcArr[0];
|
|
const MotionSegment& dstSeg = dstArr[0];
|
|
MOZ_ASSERT(srcSeg.mSegmentType == eSegmentType_PathPoint,
|
|
"expecting to be adding points from a motion path");
|
|
MOZ_ASSERT(dstSeg.mSegmentType == eSegmentType_PathPoint,
|
|
"expecting to be adding points from a motion path");
|
|
|
|
const PathPointParams& srcParams = srcSeg.mU.mPathPointParams;
|
|
const PathPointParams& dstParams = dstSeg.mU.mPathPointParams;
|
|
|
|
MOZ_ASSERT(srcSeg.mRotateType == dstSeg.mRotateType &&
|
|
srcSeg.mRotateAngle == dstSeg.mRotateAngle,
|
|
"unexpected angle mismatch");
|
|
MOZ_ASSERT(srcParams.mPath == dstParams.mPath,
|
|
"unexpected path mismatch");
|
|
Path* path = srcParams.mPath;
|
|
|
|
// Use destination to get our rotate angle.
|
|
float rotateAngle = dstSeg.mRotateAngle;
|
|
Point dstPt;
|
|
GetAngleAndPointAtDistance(path, dstParams.mDistToPoint, dstSeg.mRotateType,
|
|
rotateAngle, dstPt);
|
|
|
|
Point srcPt = path->ComputePointAtLength(srcParams.mDistToPoint);
|
|
|
|
float newX = dstPt.x + srcPt.x * aCount;
|
|
float newY = dstPt.y + srcPt.y * aCount;
|
|
|
|
// Replace destination's current value -- a point-on-a-path -- with the
|
|
// translation that results from our addition.
|
|
dstArr.ReplaceElementAt(0, MotionSegment(newX, newY, rotateAngle));
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
SVGMotionSMILType::SandwichAdd(nsSMILValue& aDest,
|
|
const nsSMILValue& aValueToAdd) const
|
|
{
|
|
MOZ_ASSERT(aDest.mType == aValueToAdd.mType,
|
|
"Incompatible SMIL types");
|
|
MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL type");
|
|
MotionSegmentArray& dstArr = ExtractMotionSegmentArray(aDest);
|
|
const MotionSegmentArray& srcArr = ExtractMotionSegmentArray(aValueToAdd);
|
|
|
|
// We're only expecting to be adding 1 segment on to the list
|
|
MOZ_ASSERT(srcArr.Length() == 1,
|
|
"Trying to do sandwich add of more than one value");
|
|
|
|
if (!dstArr.AppendElement(srcArr[0], fallible)) {
|
|
return NS_ERROR_OUT_OF_MEMORY;
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
SVGMotionSMILType::ComputeDistance(const nsSMILValue& aFrom,
|
|
const nsSMILValue& aTo,
|
|
double& aDistance) const
|
|
{
|
|
MOZ_ASSERT(aFrom.mType == aTo.mType, "Incompatible SMIL types");
|
|
MOZ_ASSERT(aFrom.mType == this, "Unexpected SMIL type");
|
|
const MotionSegmentArray& fromArr = ExtractMotionSegmentArray(aFrom);
|
|
const MotionSegmentArray& toArr = ExtractMotionSegmentArray(aTo);
|
|
|
|
// ComputeDistance is only used for calculating distances between single
|
|
// values in a values array. So we should only have one entry in each array.
|
|
MOZ_ASSERT(fromArr.Length() == 1,
|
|
"Wrong number of elements in from value");
|
|
MOZ_ASSERT(toArr.Length() == 1,
|
|
"Wrong number of elements in to value");
|
|
|
|
const MotionSegment& from = fromArr[0];
|
|
const MotionSegment& to = toArr[0];
|
|
|
|
MOZ_ASSERT(from.mSegmentType == to.mSegmentType,
|
|
"Mismatched MotionSegment types");
|
|
if (from.mSegmentType == eSegmentType_PathPoint) {
|
|
const PathPointParams& fromParams = from.mU.mPathPointParams;
|
|
const PathPointParams& toParams = to.mU.mPathPointParams;
|
|
MOZ_ASSERT(fromParams.mPath == toParams.mPath,
|
|
"Interpolation endpoints should be from same path");
|
|
MOZ_ASSERT(fromParams.mDistToPoint <= toParams.mDistToPoint,
|
|
"To value shouldn't be before from value on path");
|
|
aDistance = fabs(toParams.mDistToPoint - fromParams.mDistToPoint);
|
|
} else {
|
|
const TranslationParams& fromParams = from.mU.mTranslationParams;
|
|
const TranslationParams& toParams = to.mU.mTranslationParams;
|
|
float dX = toParams.mX - fromParams.mX;
|
|
float dY = toParams.mY - fromParams.mY;
|
|
aDistance = NS_hypot(dX, dY);
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// Helper method for Interpolate()
|
|
static inline float
|
|
InterpolateFloat(const float& aStartFlt, const float& aEndFlt,
|
|
const double& aUnitDistance)
|
|
{
|
|
return aStartFlt + aUnitDistance * (aEndFlt - aStartFlt);
|
|
}
|
|
|
|
nsresult
|
|
SVGMotionSMILType::Interpolate(const nsSMILValue& aStartVal,
|
|
const nsSMILValue& aEndVal,
|
|
double aUnitDistance,
|
|
nsSMILValue& aResult) const
|
|
{
|
|
MOZ_ASSERT(aStartVal.mType == aEndVal.mType,
|
|
"Trying to interpolate different types");
|
|
MOZ_ASSERT(aStartVal.mType == this,
|
|
"Unexpected types for interpolation");
|
|
MOZ_ASSERT(aResult.mType == this, "Unexpected result type");
|
|
MOZ_ASSERT(aUnitDistance >= 0.0 && aUnitDistance <= 1.0,
|
|
"unit distance value out of bounds");
|
|
|
|
const MotionSegmentArray& startArr = ExtractMotionSegmentArray(aStartVal);
|
|
const MotionSegmentArray& endArr = ExtractMotionSegmentArray(aEndVal);
|
|
MotionSegmentArray& resultArr = ExtractMotionSegmentArray(aResult);
|
|
|
|
MOZ_ASSERT(startArr.Length() <= 1,
|
|
"Invalid start-point for animateMotion interpolation");
|
|
MOZ_ASSERT(endArr.Length() == 1,
|
|
"Invalid end-point for animateMotion interpolation");
|
|
MOZ_ASSERT(resultArr.IsEmpty(),
|
|
"Expecting result to be just-initialized w/ empty array");
|
|
|
|
const MotionSegment& endSeg = endArr[0];
|
|
MOZ_ASSERT(endSeg.mSegmentType == eSegmentType_PathPoint,
|
|
"Expecting to be interpolating along a path");
|
|
|
|
const PathPointParams& endParams = endSeg.mU.mPathPointParams;
|
|
// NOTE: path & angle should match between start & end (since presumably
|
|
// start & end came from the same <animateMotion> element), unless start is
|
|
// empty. (as it would be for pure 'to' animation)
|
|
Path* path = endParams.mPath;
|
|
RotateType rotateType = endSeg.mRotateType;
|
|
float rotateAngle = endSeg.mRotateAngle;
|
|
|
|
float startDist;
|
|
if (startArr.IsEmpty()) {
|
|
startDist = 0.0f;
|
|
} else {
|
|
const MotionSegment& startSeg = startArr[0];
|
|
MOZ_ASSERT(startSeg.mSegmentType == eSegmentType_PathPoint,
|
|
"Expecting to be interpolating along a path");
|
|
const PathPointParams& startParams = startSeg.mU.mPathPointParams;
|
|
MOZ_ASSERT(startSeg.mRotateType == endSeg.mRotateType &&
|
|
startSeg.mRotateAngle == endSeg.mRotateAngle,
|
|
"unexpected angle mismatch");
|
|
MOZ_ASSERT(startParams.mPath == endParams.mPath,
|
|
"unexpected path mismatch");
|
|
startDist = startParams.mDistToPoint;
|
|
}
|
|
|
|
// Get the interpolated distance along our path.
|
|
float resultDist = InterpolateFloat(startDist, endParams.mDistToPoint,
|
|
aUnitDistance);
|
|
|
|
// Construct the intermediate result segment, and put it in our outparam.
|
|
// AppendElement has guaranteed success here, since Init() allocates 1 slot.
|
|
MOZ_ALWAYS_TRUE(resultArr.AppendElement(MotionSegment(path, resultDist,
|
|
rotateType,
|
|
rotateAngle),
|
|
fallible));
|
|
return NS_OK;
|
|
}
|
|
|
|
/* static */ gfx::Matrix
|
|
SVGMotionSMILType::CreateMatrix(const nsSMILValue& aSMILVal)
|
|
{
|
|
const MotionSegmentArray& arr = ExtractMotionSegmentArray(aSMILVal);
|
|
|
|
gfx::Matrix matrix;
|
|
uint32_t length = arr.Length();
|
|
for (uint32_t i = 0; i < length; i++) {
|
|
Point point; // initialized below
|
|
float rotateAngle = arr[i].mRotateAngle; // might get updated below
|
|
if (arr[i].mSegmentType == eSegmentType_Translation) {
|
|
point.x = arr[i].mU.mTranslationParams.mX;
|
|
point.y = arr[i].mU.mTranslationParams.mY;
|
|
MOZ_ASSERT(arr[i].mRotateType == eRotateType_Explicit,
|
|
"'auto'/'auto-reverse' should have been converted to "
|
|
"explicit angles when we generated this translation");
|
|
} else {
|
|
GetAngleAndPointAtDistance(arr[i].mU.mPathPointParams.mPath,
|
|
arr[i].mU.mPathPointParams.mDistToPoint,
|
|
arr[i].mRotateType,
|
|
rotateAngle, point);
|
|
}
|
|
matrix.PreTranslate(point.x, point.y);
|
|
matrix.PreRotate(rotateAngle);
|
|
}
|
|
return matrix;
|
|
}
|
|
|
|
/* static */ nsSMILValue
|
|
SVGMotionSMILType::ConstructSMILValue(Path* aPath,
|
|
float aDist,
|
|
RotateType aRotateType,
|
|
float aRotateAngle)
|
|
{
|
|
nsSMILValue smilVal(&SVGMotionSMILType::sSingleton);
|
|
MotionSegmentArray& arr = ExtractMotionSegmentArray(smilVal);
|
|
|
|
// AppendElement has guaranteed success here, since Init() allocates 1 slot.
|
|
MOZ_ALWAYS_TRUE(arr.AppendElement(MotionSegment(aPath, aDist,
|
|
aRotateType, aRotateAngle),
|
|
fallible));
|
|
return smilVal;
|
|
}
|
|
|
|
} // namespace mozilla
|