SkiaShader.h revision 64bb413a664001c95c8439cf097dc3033f4ed733 
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_HWUI_SKIA_SHADER_H
18#define ANDROID_HWUI_SKIA_SHADER_H
19
20#include <SkShader.h>
21#include <SkXfermode.h>
22
23#include <GLES2/gl2.h>
24
25#include <cutils/compiler.h>
26
27#include "Matrix.h"
28
29namespace android {
30namespace uirenderer {
31
32class Caches;
33class Extensions;
34class Layer;
35struct ProgramDescription;
36
37/**
38 * Type of Skia shader in use.
39 */
40enum SkiaShaderType {
41    kNone_SkiaShaderType,
42    kBitmap_SkiaShaderType,
43    kGradient_SkiaShaderType,
44    kCompose_SkiaShaderType,
45    kLayer_SkiaShaderType
46};
47
48class SkiaShader {
49public:
50    static SkiaShaderType getType(const SkShader& shader);
51    static void describe(Caches* caches, ProgramDescription& description,
52            const Extensions& extensions, const SkShader& shader);
53    static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
54            GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
55};
56
57class InvalidSkiaShader {
58public:
59    static void describe(Caches* caches, ProgramDescription& description,
60            const Extensions& extensions, const SkShader& shader) {
61        // This shader is unsupported. Skip it.
62    }
63    static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
64            GLuint* textureUnit, const Extensions& extensions, const SkShader& shader) {
65        // This shader is unsupported. Skip it.
66    }
67
68};
69/**
70 * A shader that draws a layer.
71 */
72class SkiaLayerShader {
73public:
74    static void describe(Caches* caches, ProgramDescription& description,
75            const Extensions& extensions, const SkShader& shader);
76    static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
77            GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
78}; // class SkiaLayerShader
79
80/**
81 * A shader that draws a bitmap.
82 */
83class SkiaBitmapShader {
84public:
85    static void describe(Caches* caches, ProgramDescription& description,
86            const Extensions& extensions, const SkShader& shader);
87    static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
88            GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
89
90
91}; // class SkiaBitmapShader
92
93/**
94 * A shader that draws one of three types of gradient, depending on shader param.
95 */
96class SkiaGradientShader {
97public:
98    static void describe(Caches* caches, ProgramDescription& description,
99            const Extensions& extensions, const SkShader& shader);
100    static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
101            GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
102};
103
104/**
105 * A shader that draws two shaders, composited with an xfermode.
106 */
107class SkiaComposeShader {
108public:
109    static void describe(Caches* caches, ProgramDescription& description,
110            const Extensions& extensions, const SkShader& shader);
111    static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
112            GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
113}; // class SkiaComposeShader
114
115}; // namespace uirenderer
116}; // namespace android
117
118#endif // ANDROID_HWUI_SKIA_SHADER_H
119