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      1 /*
      2  * Copyright (C) 2007 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_TRANSFORM_H
     18 #define ANDROID_TRANSFORM_H
     19 
     20 #include <stdint.h>
     21 #include <sys/types.h>
     22 
     23 #include <ui/Point.h>
     24 #include <ui/Rect.h>
     25 #include <ui/vec2.h>
     26 #include <ui/vec3.h>
     27 
     28 #include <hardware/hardware.h>
     29 
     30 namespace android {
     31 
     32 class Region;
     33 
     34 // ---------------------------------------------------------------------------
     35 
     36 class Transform
     37 {
     38 public:
     39                     Transform();
     40                     Transform(const Transform&  other);
     41            explicit Transform(uint32_t orientation);
     42                     ~Transform();
     43 
     44             enum orientation_flags {
     45                 ROT_0   = 0x00000000,
     46                 FLIP_H  = HAL_TRANSFORM_FLIP_H,
     47                 FLIP_V  = HAL_TRANSFORM_FLIP_V,
     48                 ROT_90  = HAL_TRANSFORM_ROT_90,
     49                 ROT_180 = FLIP_H|FLIP_V,
     50                 ROT_270 = ROT_180|ROT_90,
     51                 ROT_INVALID = 0x80
     52             };
     53 
     54             enum type_mask {
     55                 IDENTITY            = 0,
     56                 TRANSLATE           = 0x1,
     57                 ROTATE              = 0x2,
     58                 SCALE               = 0x4,
     59                 UNKNOWN             = 0x8
     60             };
     61 
     62             // query the transform
     63             bool        preserveRects() const;
     64             uint32_t    getType() const;
     65             uint32_t    getOrientation() const;
     66 
     67             const vec3& operator [] (size_t i) const;  // returns column i
     68             float   tx() const;
     69             float   ty() const;
     70 
     71             // modify the transform
     72             void        reset();
     73             void        set(float tx, float ty);
     74             void        set(float a, float b, float c, float d);
     75             status_t    set(uint32_t flags, float w, float h);
     76 
     77             // transform data
     78             Rect    makeBounds(int w, int h) const;
     79             vec2    transform(int x, int y) const;
     80             Region  transform(const Region& reg) const;
     81             Rect    transform(const Rect& bounds,
     82                     bool roundOutwards = false) const;
     83             Transform operator * (const Transform& rhs) const;
     84             // assumes the last row is < 0 , 0 , 1 >
     85             vec2 transform(const vec2& v) const;
     86             vec3 transform(const vec3& v) const;
     87 
     88             Transform inverse() const;
     89 
     90             // for debugging
     91             void dump(const char* name) const;
     92 
     93 private:
     94     struct mat33 {
     95         vec3 v[3];
     96         inline const vec3& operator [] (int i) const { return v[i]; }
     97         inline vec3& operator [] (int i) { return v[i]; }
     98     };
     99 
    100     enum { UNKNOWN_TYPE = 0x80000000 };
    101 
    102     uint32_t type() const;
    103     static bool absIsOne(float f);
    104     static bool isZero(float f);
    105 
    106     mat33               mMatrix;
    107     mutable uint32_t    mType;
    108 };
    109 
    110 // ---------------------------------------------------------------------------
    111 }; // namespace android
    112 
    113 #endif /* ANDROID_TRANSFORM_H */
    114