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