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 "Rect.h"
19
20 #include <utils/Log.h>
21
22 namespace android {
23 namespace uirenderer {
24
Scissor()25 Scissor::Scissor()
26 : mEnabled(false), mScissorX(0), mScissorY(0), mScissorWidth(0), mScissorHeight(0) {}
27
setEnabled(bool enabled)28 bool Scissor::setEnabled(bool enabled) {
29 if (mEnabled != enabled) {
30 if (enabled) {
31 glEnable(GL_SCISSOR_TEST);
32 } else {
33 glDisable(GL_SCISSOR_TEST);
34 }
35 mEnabled = enabled;
36 return true;
37 }
38 return false;
39 }
40
set(GLint x,GLint y,GLint width,GLint height)41 bool Scissor::set(GLint x, GLint y, GLint width, GLint height) {
42 if (mEnabled &&
43 (x != mScissorX || y != mScissorY || width != mScissorWidth || height != mScissorHeight)) {
44 if (x < 0) {
45 width += x;
46 x = 0;
47 }
48 if (y < 0) {
49 height += y;
50 y = 0;
51 }
52 if (width < 0) {
53 width = 0;
54 }
55 if (height < 0) {
56 height = 0;
57 }
58 glScissor(x, y, width, height);
59
60 mScissorX = x;
61 mScissorY = y;
62 mScissorWidth = width;
63 mScissorHeight = height;
64
65 return true;
66 }
67 return false;
68 }
69
set(int viewportHeight,const Rect & clip)70 void Scissor::set(int viewportHeight, const Rect& clip) {
71 // transform to Y-flipped GL space, and prevent negatives
72 GLint x = std::max(0, (int)clip.left);
73 GLint y = std::max(0, viewportHeight - (int)clip.bottom);
74 GLint width = std::max(0, ((int)clip.right) - x);
75 GLint height = std::max(0, (viewportHeight - (int)clip.top) - y);
76
77 if (x != mScissorX || y != mScissorY || width != mScissorWidth || height != mScissorHeight) {
78 glScissor(x, y, width, height);
79
80 mScissorX = x;
81 mScissorY = y;
82 mScissorWidth = width;
83 mScissorHeight = height;
84 }
85 }
86
reset()87 void Scissor::reset() {
88 mScissorX = mScissorY = mScissorWidth = mScissorHeight = 0;
89 }
90
invalidate()91 void Scissor::invalidate() {
92 mEnabled = glIsEnabled(GL_SCISSOR_TEST);
93 setEnabled(true);
94 reset();
95 }
96
dump()97 void Scissor::dump() {
98 ALOGD("Scissor: enabled %d, %d %d %d %d", mEnabled, mScissorX, mScissorY, mScissorWidth,
99 mScissorHeight);
100 }
101
102 } /* namespace uirenderer */
103 } /* namespace android */
104