Home | History | Annotate | Download | only in ui 
      1 /*
      2  * Copyright (C) 2009 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 #include <system/graphics.h>
     18 #include <ui/Rect.h>
     19 
     20 namespace android {
     21 
     22 static inline int32_t min(int32_t a, int32_t b) {
     23     return (a < b) ? a : b;
     24 }
     25 
     26 static inline int32_t max(int32_t a, int32_t b) {
     27     return (a > b) ? a : b;
     28 }
     29 
     30 void Rect::makeInvalid() {
     31     left = 0;
     32     top = 0;
     33     right = -1;
     34     bottom = -1;
     35 }
     36 
     37 bool Rect::operator <(const Rect& rhs) const {
     38     if (top < rhs.top) {
     39         return true;
     40     } else if (top == rhs.top) {
     41         if (left < rhs.left) {
     42             return true;
     43         } else if (left == rhs.left) {
     44             if (bottom < rhs.bottom) {
     45                 return true;
     46             } else if (bottom == rhs.bottom) {
     47                 if (right < rhs.right) {
     48                     return true;
     49                 }
     50             }
     51         }
     52     }
     53     return false;
     54 }
     55 
     56 Rect& Rect::offsetTo(int32_t x, int32_t y) {
     57     right -= left - x;
     58     bottom -= top - y;
     59     left = x;
     60     top = y;
     61     return *this;
     62 }
     63 
     64 Rect& Rect::offsetBy(int32_t x, int32_t y) {
     65     left += x;
     66     top += y;
     67     right += x;
     68     bottom += y;
     69     return *this;
     70 }
     71 
     72 const Rect Rect::operator +(const Point& rhs) const {
     73     const Rect result(left + rhs.x, top + rhs.y, right + rhs.x, bottom + rhs.y);
     74     return result;
     75 }
     76 
     77 const Rect Rect::operator -(const Point& rhs) const {
     78     const Rect result(left - rhs.x, top - rhs.y, right - rhs.x, bottom - rhs.y);
     79     return result;
     80 }
     81 
     82 bool Rect::intersect(const Rect& with, Rect* result) const {
     83     result->left = max(left, with.left);
     84     result->top = max(top, with.top);
     85     result->right = min(right, with.right);
     86     result->bottom = min(bottom, with.bottom);
     87     return !(result->isEmpty());
     88 }
     89 
     90 Rect Rect::transform(uint32_t xform, int32_t width, int32_t height) const {
     91     Rect result(*this);
     92     if (xform & HAL_TRANSFORM_FLIP_H) {
     93         result = Rect(width - result.right, result.top, width - result.left,
     94                 result.bottom);
     95     }
     96     if (xform & HAL_TRANSFORM_FLIP_V) {
     97         result = Rect(result.left, height - result.bottom, result.right,
     98                 height - result.top);
     99     }
    100     if (xform & HAL_TRANSFORM_ROT_90) {
    101         int left = height - result.bottom;
    102         int top = result.left;
    103         int right = height - result.top;
    104         int bottom = result.right;
    105         result = Rect(left, top, right, bottom);
    106     }
    107     return result;
    108 }
    109 
    110 Rect Rect::reduce(const Rect& exclude) const {
    111     Rect result;
    112 
    113     uint32_t mask = 0;
    114     mask |= (exclude.left   > left)   ? 1 : 0;
    115     mask |= (exclude.top    > top)    ? 2 : 0;
    116     mask |= (exclude.right  < right)  ? 4 : 0;
    117     mask |= (exclude.bottom < bottom) ? 8 : 0;
    118 
    119     if (mask == 0) {
    120         // crop entirely covers us
    121         result.clear();
    122     } else {
    123         result = *this;
    124         if (!(mask & (mask - 1))) {
    125             // power-of-2, i.e.: just one bit is set
    126             if (mask & 1) {
    127                 result.right = exclude.left;
    128             } else if (mask & 2) {
    129                 result.bottom = exclude.top;
    130             } else if (mask & 4) {
    131                 result.left = exclude.right;
    132             } else if (mask & 8) {
    133                 result.top = exclude.bottom;
    134             }
    135         }
    136     }
    137 
    138     return result;
    139 }
    140 
    141 }; // namespace android
    142