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* Copyright 2006 The Android Open Source Project
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
// Inspired by Rob Johnson's most excellent QuickDraw GX sample code
#ifndef SkCamera_DEFINED
#define SkCamera_DEFINED
#include "SkMatrix.h"
class SkCanvas;
struct SkUnit3D {
SkScalar fX, fY, fZ;
void set(SkScalar x, SkScalar y, SkScalar z) {
fX = x; fY = y; fZ = z;
static SkScalar Dot(const SkUnit3D&, const SkUnit3D&);
static void Cross(const SkUnit3D&, const SkUnit3D&, SkUnit3D* cross);
struct SkPoint3D {
SkScalar fX, fY, fZ;
void set(SkScalar x, SkScalar y, SkScalar z) {
fX = x; fY = y; fZ = z;
SkScalar normalize(SkUnit3D*) const;
typedef SkPoint3D SkVector3D;
struct SkMatrix3D {
SkScalar fMat[3][4];
void reset();
void setRow(int row, SkScalar a, SkScalar b, SkScalar c, SkScalar d = 0) {
SkASSERT((unsigned)row < 3);
fMat[row][0] = a;
fMat[row][1] = b;
fMat[row][2] = c;
fMat[row][3] = d;
void setRotateX(SkScalar deg);
void setRotateY(SkScalar deg);
void setRotateZ(SkScalar deg);
void setTranslate(SkScalar x, SkScalar y, SkScalar z);
void preRotateX(SkScalar deg);
void preRotateY(SkScalar deg);
void preRotateZ(SkScalar deg);
void preTranslate(SkScalar x, SkScalar y, SkScalar z);
void setConcat(const SkMatrix3D& a, const SkMatrix3D& b);
void mapPoint(const SkPoint3D& src, SkPoint3D* dst) const;
void mapVector(const SkVector3D& src, SkVector3D* dst) const;
void mapPoint(SkPoint3D* v) const {
this->mapPoint(*v, v);
void mapVector(SkVector3D* v) const {
this->mapVector(*v, v);
class SkPatch3D {
void reset();
void transform(const SkMatrix3D&, SkPatch3D* dst = NULL) const;
// dot a unit vector with the patch's normal
SkScalar dotWith(SkScalar dx, SkScalar dy, SkScalar dz) const;
SkScalar dotWith(const SkVector3D& v) const {
return this->dotWith(v.fX, v.fY, v.fZ);
// deprecated, but still here for animator (for now)
void rotate(SkScalar /*x*/, SkScalar /*y*/, SkScalar /*z*/) {}
void rotateDegrees(SkScalar /*x*/, SkScalar /*y*/, SkScalar /*z*/) {}
public: // make public for SkDraw3D for now
SkVector3D fU, fV;
SkPoint3D fOrigin;
friend class SkCamera3D;
class SkCamera3D {
void reset();
void update();
void patchToMatrix(const SkPatch3D&, SkMatrix* matrix) const;
SkPoint3D fLocation;
SkPoint3D fAxis;
SkPoint3D fZenith;
SkPoint3D fObserver;
mutable SkMatrix fOrientation;
mutable bool fNeedToUpdate;
void doUpdate() const;
class Sk3DView : SkNoncopyable {
void save();
void restore();
void translate(SkScalar x, SkScalar y, SkScalar z);
void rotateX(SkScalar deg);
void rotateY(SkScalar deg);
void rotateZ(SkScalar deg);
void setCameraLocation(SkScalar x, SkScalar y, SkScalar z);
SkScalar getCameraLocationX();
SkScalar getCameraLocationY();
SkScalar getCameraLocationZ();
void getMatrix(SkMatrix*) const;
void applyToCanvas(SkCanvas*) const;
SkScalar dotWithNormal(SkScalar dx, SkScalar dy, SkScalar dz) const;
struct Rec {
Rec* fNext;
SkMatrix3D fMatrix;
Rec* fRec;
Rec fInitialRec;
SkCamera3D fCamera;