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      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 "Extensions.h"
     28 #include "ProgramCache.h"
     29 #include "TextureCache.h"
     30 #include "GradientCache.h"
     31 
     32 namespace android {
     33 namespace uirenderer {
     34 
     35 class Caches;
     36 class Layer;
     37 
     38 /**
     39  * Type of Skia shader in use.
     40  */
     41 enum SkiaShaderType {
     42     kNone_SkiaShaderType,
     43     kBitmap_SkiaShaderType,
     44     kGradient_SkiaShaderType,
     45     kCompose_SkiaShaderType,
     46     kLayer_SkiaShaderType
     47 };
     48 
     49 class SkiaShader {
     50 public:
     51     static SkiaShaderType getType(const SkShader& shader);
     52     static void describe(Caches* caches, ProgramDescription& description,
     53             const Extensions& extensions, const SkShader& shader);
     54     static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
     55             GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
     56 };
     57 
     58 class InvalidSkiaShader {
     59 public:
     60     static void describe(Caches* caches, ProgramDescription& description,
     61             const Extensions& extensions, const SkShader& shader) {
     62         // This shader is unsupported. Skip it.
     63     }
     64     static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
     65             GLuint* textureUnit, const Extensions& extensions, const SkShader& shader) {
     66         // This shader is unsupported. Skip it.
     67     }
     68 
     69 };
     70 /**
     71  * A shader that draws a layer.
     72  */
     73 class SkiaLayerShader {
     74 public:
     75     static void describe(Caches* caches, ProgramDescription& description,
     76             const Extensions& extensions, const SkShader& shader);
     77     static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
     78             GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
     79 }; // class SkiaLayerShader
     80 
     81 /**
     82  * A shader that draws a bitmap.
     83  */
     84 class SkiaBitmapShader {
     85 public:
     86     static void describe(Caches* caches, ProgramDescription& description,
     87             const Extensions& extensions, const SkShader& shader);
     88     static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
     89             GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
     90 
     91 
     92 }; // class SkiaBitmapShader
     93 
     94 /**
     95  * A shader that draws one of three types of gradient, depending on shader param.
     96  */
     97 class SkiaGradientShader {
     98 public:
     99     static void describe(Caches* caches, ProgramDescription& description,
    100             const Extensions& extensions, const SkShader& shader);
    101     static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
    102             GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
    103 };
    104 
    105 /**
    106  * A shader that draws two shaders, composited with an xfermode.
    107  */
    108 class SkiaComposeShader {
    109 public:
    110     static void describe(Caches* caches, ProgramDescription& description,
    111             const Extensions& extensions, const SkShader& shader);
    112     static void setupProgram(Caches* caches, const mat4& modelViewMatrix,
    113             GLuint* textureUnit, const Extensions& extensions, const SkShader& shader);
    114 }; // class SkiaComposeShader
    115 
    116 }; // namespace uirenderer
    117 }; // namespace android
    118 
    119 #endif // ANDROID_HWUI_SKIA_SHADER_H
    120