OpenGLRenderer.h revision f6a11b8a9e25ff9861bbba19251bea84d8a5daf2 
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_OPENGL_RENDERER_H
18#define ANDROID_OPENGL_RENDERER_H
19
20#include <SkMatrix.h>
21#include <SkXfermode.h>
22
23#include <utils/RefBase.h>
24
25#include "Matrix.h"
26#include "Rect.h"
27
28namespace android {
29
30///////////////////////////////////////////////////////////////////////////////
31// Support
32///////////////////////////////////////////////////////////////////////////////
33
34class Snapshot: public LightRefBase<Snapshot> {
35public:
36	Snapshot() {
37	}
38
39	Snapshot(const sp<Snapshot> s): transform(s->transform), clipRect(s->clipRect),
40				flags(0), previous(s) {
41	}
42
43	enum Flags {
44		kFlagClipSet = 0x1,
45	};
46
47	// Local transformations
48	mat4 transform;
49
50	// Clipping rectangle at the time of this snapshot
51	Rect clipRect;
52
53	// Dirty flags
54	int flags;
55
56	// Previous snapshot in the frames stack
57	sp<Snapshot> previous;
58}; // struct Snapshot
59
60///////////////////////////////////////////////////////////////////////////////
61// Renderer
62///////////////////////////////////////////////////////////////////////////////
63
64class OpenGLRenderer {
65public:
66    OpenGLRenderer();
67    ~OpenGLRenderer();
68
69    void setViewport(int width, int height);
70    void prepare();
71
72    int getSaveCount() const;
73    int save(int flags);
74    void restore();
75    void restoreToCount(int saveCount);
76
77    void translate(float dx, float dy);
78    void rotate(float degrees);
79    void scale(float sx, float sy);
80
81    void setMatrix(SkMatrix* matrix);
82    void getMatrix(SkMatrix* matrix);
83    void concatMatrix(SkMatrix* matrix);
84
85    bool clipRect(float left, float top, float right, float bottom);
86
87    void drawColor(int color, SkXfermode::Mode mode);
88
89private:
90    int saveSnapshot();
91    bool restoreSnapshot();
92
93    void setScissorFromClip();
94
95    // Dimensions of the drawing surface
96    int mWidth, mHeight;
97
98    // Matrix used for ortho projection in shaders
99    float mOrthoMatrix[16];
100
101    // Number of saved states
102    int mSaveCount;
103    // Base state
104    Snapshot mFirstSnapshot;
105    // Current state
106    sp<Snapshot> mSnapshot;
107}; // class OpenGLRenderer
108
109}; // namespace android
110
111#endif // ANDROID_OPENGL_RENDERER_H
112