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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_HWUI_MATRIX_H
     18 #define ANDROID_HWUI_MATRIX_H
     19 
     20 #include <SkMatrix.h>
     21 
     22 #include <cutils/compiler.h>
     23 
     24 #include "Rect.h"
     25 
     26 namespace android {
     27 namespace uirenderer {
     28 
     29 #define SK_MATRIX_STRING "[%.2f %.2f %.2f] [%.2f %.2f %.2f] [%.2f %.2f %.2f]"
     30 #define SK_MATRIX_ARGS(m) \
     31     (m)->get(0), (m)->get(1), (m)->get(2), \
     32     (m)->get(3), (m)->get(4), (m)->get(5), \
     33     (m)->get(6), (m)->get(7), (m)->get(8)
     34 
     35 #define MATRIX_4_STRING "[%.2f %.2f %.2f %.2f] [%.2f %.2f %.2f %.2f]" \
     36     " [%.2f %.2f %.2f %.2f] [%.2f %.2f %.2f %.2f]"
     37 #define MATRIX_4_ARGS(m) \
     38     (m)->data[0], (m)->data[4], (m)->data[8], (m)->data[12], \
     39     (m)->data[1], (m)->data[5], (m)->data[9], (m)->data[13], \
     40     (m)->data[2], (m)->data[6], (m)->data[10], (m)->data[14], \
     41     (m)->data[3], (m)->data[7], (m)->data[11], (m)->data[15] \
     42 
     43 ///////////////////////////////////////////////////////////////////////////////
     44 // Classes
     45 ///////////////////////////////////////////////////////////////////////////////
     46 
     47 class ANDROID_API Matrix4 {
     48 public:
     49     float data[16];
     50 
     51     enum Entry {
     52         kScaleX = 0,
     53         kSkewY = 1,
     54         kPerspective0 = 3,
     55         kSkewX = 4,
     56         kScaleY = 5,
     57         kPerspective1 = 7,
     58         kScaleZ = 10,
     59         kTranslateX = 12,
     60         kTranslateY = 13,
     61         kTranslateZ = 14,
     62         kPerspective2 = 15
     63     };
     64 
     65     // NOTE: The flags from kTypeIdentity to kTypePerspective
     66     //       must be kept in sync with the type flags found
     67     //       in SkMatrix
     68     enum Type {
     69         kTypeIdentity = 0,
     70         kTypeTranslate = 0x1,
     71         kTypeScale = 0x2,
     72         kTypeAffine = 0x4,
     73         kTypePerspective = 0x8,
     74         kTypeRectToRect = 0x10,
     75         kTypeUnknown = 0x20,
     76     };
     77 
     78     static const int sGeometryMask = 0xf;
     79 
     80     Matrix4() {
     81         loadIdentity();
     82     }
     83 
     84     Matrix4(const float* v) {
     85         load(v);
     86     }
     87 
     88     Matrix4(const Matrix4& v) {
     89         load(v);
     90     }
     91 
     92     Matrix4(const SkMatrix& v) {
     93         load(v);
     94     }
     95 
     96     float operator[](int index) const {
     97         return data[index];
     98     }
     99 
    100     float& operator[](int index) {
    101         mType = kTypeUnknown;
    102         return data[index];
    103     }
    104 
    105     Matrix4& operator=(const SkMatrix& v) {
    106         load(v);
    107         return *this;
    108     }
    109 
    110     friend bool operator==(const Matrix4& a, const Matrix4& b) {
    111         return !memcmp(&a.data[0], &b.data[0], 16 * sizeof(float));
    112     }
    113 
    114     friend bool operator!=(const Matrix4& a, const Matrix4& b) {
    115         return !(a == b);
    116     }
    117 
    118     void loadIdentity();
    119 
    120     void load(const float* v);
    121     void load(const Matrix4& v);
    122     void load(const SkMatrix& v);
    123 
    124     void loadInverse(const Matrix4& v);
    125 
    126     void loadTranslate(float x, float y, float z);
    127     void loadScale(float sx, float sy, float sz);
    128     void loadSkew(float sx, float sy);
    129     void loadRotate(float angle);
    130     void loadRotate(float angle, float x, float y, float z);
    131     void loadMultiply(const Matrix4& u, const Matrix4& v);
    132 
    133     void loadOrtho(float left, float right, float bottom, float top, float near, float far);
    134 
    135     uint8_t getType() const;
    136 
    137     void multiply(const Matrix4& v) {
    138         Matrix4 u;
    139         u.loadMultiply(*this, v);
    140         load(u);
    141     }
    142 
    143     void multiply(float v);
    144 
    145     void translate(float x, float y, float z = 0) {
    146         if ((getType() & sGeometryMask) <= kTypeTranslate) {
    147             data[kTranslateX] += x;
    148             data[kTranslateY] += y;
    149             data[kTranslateZ] += z;
    150             mType |= kTypeUnknown;
    151         } else {
    152             // Doing a translation will only affect the translate bit of the type
    153             // Save the type
    154             uint8_t type = mType;
    155 
    156             Matrix4 u;
    157             u.loadTranslate(x, y, z);
    158             multiply(u);
    159 
    160             // Restore the type and fix the translate bit
    161             mType = type;
    162             if (data[kTranslateX] != 0.0f || data[kTranslateY] != 0.0f) {
    163                 mType |= kTypeTranslate;
    164             } else {
    165                 mType &= ~kTypeTranslate;
    166             }
    167         }
    168     }
    169 
    170     void scale(float sx, float sy, float sz) {
    171         Matrix4 u;
    172         u.loadScale(sx, sy, sz);
    173         multiply(u);
    174     }
    175 
    176     void skew(float sx, float sy) {
    177         Matrix4 u;
    178         u.loadSkew(sx, sy);
    179         multiply(u);
    180     }
    181 
    182     void rotate(float angle, float x, float y, float z) {
    183         Matrix4 u;
    184         u.loadRotate(angle, x, y, z);
    185         multiply(u);
    186     }
    187 
    188     /**
    189      * If the matrix is identity or translate and/or scale.
    190      */
    191     bool isSimple() const;
    192     bool isPureTranslate() const;
    193     bool isIdentity() const;
    194     bool isPerspective() const;
    195     bool rectToRect() const;
    196     bool positiveScale() const;
    197 
    198     bool changesBounds() const;
    199 
    200     void copyTo(float* v) const;
    201     void copyTo(SkMatrix& v) const;
    202 
    203     float mapZ(const Vector3& orig) const;
    204     void mapPoint3d(Vector3& vec) const;
    205     void mapPoint(float& x, float& y) const; // 2d only
    206     void mapRect(Rect& r) const; // 2d only
    207 
    208     float getTranslateX() const;
    209     float getTranslateY() const;
    210 
    211     void decomposeScale(float& sx, float& sy) const;
    212 
    213     void dump(const char* label = NULL) const;
    214 
    215     static const Matrix4& identity();
    216 
    217 private:
    218     mutable uint8_t mType;
    219 
    220     inline float get(int i, int j) const {
    221         return data[i * 4 + j];
    222     }
    223 
    224     inline void set(int i, int j, float v) {
    225         data[i * 4 + j] = v;
    226     }
    227 
    228     uint8_t getGeometryType() const;
    229 
    230 }; // class Matrix4
    231 
    232 ///////////////////////////////////////////////////////////////////////////////
    233 // Types
    234 ///////////////////////////////////////////////////////////////////////////////
    235 
    236 typedef Matrix4 mat4;
    237 
    238 }; // namespace uirenderer
    239 }; // namespace android
    240 
    241 #endif // ANDROID_HWUI_MATRIX_H
    242