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      1 /*
      2  * Copyright (C) 2015 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 #include "renderstate/Scissor.h"
     17 
     18 #include <utils/Log.h>
     19 
     20 namespace android {
     21 namespace uirenderer {
     22 
     23 Scissor::Scissor()
     24     : mEnabled(false)
     25     , mScissorX(0)
     26     , mScissorY(0)
     27     , mScissorWidth(0)
     28     , mScissorHeight(0) {
     29 }
     30 
     31 bool Scissor::setEnabled(bool enabled) {
     32     if (mEnabled != enabled) {
     33         if (enabled) {
     34             glEnable(GL_SCISSOR_TEST);
     35         } else {
     36             glDisable(GL_SCISSOR_TEST);
     37         }
     38         mEnabled = enabled;
     39         return true;
     40     }
     41     return false;
     42 }
     43 
     44 bool Scissor::set(GLint x, GLint y, GLint width, GLint height) {
     45     if (mEnabled && (x != mScissorX || y != mScissorY
     46             || width != mScissorWidth || height != mScissorHeight)) {
     47 
     48         if (x < 0) {
     49             width += x;
     50             x = 0;
     51         }
     52         if (y < 0) {
     53             height += y;
     54             y = 0;
     55         }
     56         if (width < 0) {
     57             width = 0;
     58         }
     59         if (height < 0) {
     60             height = 0;
     61         }
     62         glScissor(x, y, width, height);
     63 
     64         mScissorX = x;
     65         mScissorY = y;
     66         mScissorWidth = width;
     67         mScissorHeight = height;
     68 
     69         return true;
     70     }
     71     return false;
     72 }
     73 
     74 void Scissor::reset() {
     75     mScissorX = mScissorY = mScissorWidth = mScissorHeight = 0;
     76 }
     77 
     78 void Scissor::invalidate() {
     79     mEnabled = glIsEnabled(GL_SCISSOR_TEST);
     80     setEnabled(true);
     81     reset();
     82 }
     83 
     84 void Scissor::dump() {
     85     ALOGD("Scissor: enabled %d, %d %d %d %d",
     86             mEnabled, mScissorX, mScissorY, mScissorWidth, mScissorHeight);
     87 }
     88 
     89 } /* namespace uirenderer */
     90 } /* namespace android */
     91 
     92