Home | History | Annotate | Download | only in hwui 
      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 "FloatColor.h"
     21 #include "Matrix.h"
     22 
     23 #include <GLES2/gl2.h>
     24 #include <SkShader.h>
     25 #include <SkXfermode.h>
     26 #include <cutils/compiler.h>
     27 
     28 namespace android {
     29 namespace uirenderer {
     30 
     31 class Caches;
     32 class Extensions;
     33 class Layer;
     34 class Texture;
     35 struct ProgramDescription;
     36 
     37 /**
     38  * Type of Skia shader in use.
     39  *
     40  * Note that kBitmap | kGradient = kCompose, since Compose implies
     41  * both its component types are in use simultaneously. No other
     42  * composition of multiple types is supported.
     43  */
     44 enum SkiaShaderType {
     45     kNone_SkiaShaderType = 0,
     46     kBitmap_SkiaShaderType = 1,
     47     kGradient_SkiaShaderType = 2,
     48     kCompose_SkiaShaderType = kBitmap_SkiaShaderType | kGradient_SkiaShaderType,
     49     kLayer_SkiaShaderType = 4,
     50 };
     51 
     52 struct SkiaShaderData {
     53     SkiaShaderType skiaShaderType;
     54     struct BitmapShaderData {
     55         Texture* bitmapTexture;
     56         GLuint bitmapSampler;
     57         GLenum wrapS;
     58         GLenum wrapT;
     59 
     60         Matrix4 textureTransform;
     61         float textureDimension[2];
     62     } bitmapData;
     63     struct GradientShaderData {
     64         Matrix4 screenSpace;
     65         GLuint ditherSampler;
     66 
     67         // simple gradient
     68         FloatColor startColor;
     69         FloatColor endColor;
     70 
     71         // complex gradient
     72         Texture* gradientTexture;
     73         GLuint gradientSampler;
     74         GLenum wrapST;
     75 
     76     } gradientData;
     77     struct LayerShaderData {
     78         Layer* layer;
     79         GLuint bitmapSampler;
     80         GLenum wrapS;
     81         GLenum wrapT;
     82 
     83         Matrix4 textureTransform;
     84         float textureDimension[2];
     85     } layerData;
     86 };
     87 
     88 class SkiaShader {
     89 public:
     90     static void store(Caches& caches, const SkShader& shader, const Matrix4& modelViewMatrix,
     91             GLuint* textureUnit, ProgramDescription* description,
     92             SkiaShaderData* outData);
     93     static void apply(Caches& caches, const SkiaShaderData& data);
     94 };
     95 
     96 }; // namespace uirenderer
     97 }; // namespace android
     98 
     99 #endif // ANDROID_HWUI_SKIA_SHADER_H
    100