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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_HWUI_LAYER_H
#define ANDROID_HWUI_LAYER_H
#include <sys/types.h>
#include <GLES2/gl2.h>
#include <ui/Region.h>
#include <SkXfermode.h>
#include "Rect.h"
#include "SkiaColorFilter.h"
#include "Vertex.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Layers
///////////////////////////////////////////////////////////////////////////////
/**
* A layer has dimensions and is backed by an OpenGL texture or FBO.
*/
struct Layer {
Layer(const uint32_t layerWidth, const uint32_t layerHeight):
width(layerWidth), height(layerHeight) {
mesh = NULL;
meshIndices = NULL;
meshElementCount = 0;
isCacheable = true;
isTextureLayer = false;
renderTarget = GL_TEXTURE_2D;
}
~Layer() {
if (mesh) delete mesh;
if (meshIndices) delete meshIndices;
}
/**
* Sets this layer's region to a rectangle. Computes the appropriate
* texture coordinates.
*/
void setRegionAsRect() {
const android::Rect& bounds = region.getBounds();
regionRect.set(bounds.leftTop().x, bounds.leftTop().y,
bounds.rightBottom().x, bounds.rightBottom().y);
const float texX = 1.0f / float(width);
const float texY = 1.0f / float(height);
const float height = layer.getHeight();
texCoords.set(
regionRect.left * texX, (height - regionRect.top) * texY,
regionRect.right * texX, (height - regionRect.bottom) * texY);
}
/**
* Bounds of the layer.
*/
Rect layer;
/**
* Texture coordinates of the layer.
*/
Rect texCoords;
/**
* Name of the FBO used to render the layer. If the name is 0
* this layer is not backed by an FBO, but a simple texture.
*/
GLuint fbo;
/**
* Opacity of the layer.
*/
int alpha;
/**
* Blending mode of the layer.
*/
SkXfermode::Mode mode;
/**
* Indicates whether this layer should be blended.
*/
bool blend;
/**
* Indicates whether this layer has been used already.
*/
bool empty;
/**
* Name of the texture used to render the layer.
*/
GLuint texture;
/**
* Width of the layer texture.
*/
uint32_t width;
/**
* Height of the layer texture.
*/
uint32_t height;
/**
* Dirty region indicating what parts of the layer
* have been drawn.
*/
Region region;
/**
* If the region is a rectangle, coordinates of the
* region are stored here.
*/
Rect regionRect;
/**
* Color filter used to draw this layer. Optional.
*/
SkiaColorFilter* colorFilter;
/**
* If the layer can be rendered as a mesh, this is non-null.
*/
TextureVertex* mesh;
uint16_t* meshIndices;
GLsizei meshElementCount;
/**
* If set to true (by default), the layer can be reused.
*/
bool isCacheable;
/**
* When set to true, this layer must be treated as a texture
* layer.
*/
bool isTextureLayer;
/**
* Optional texture coordinates transform.
*/
mat4 texTransform;
/**
* Indicates the render target.
*/
GLenum renderTarget;
}; // struct Layer
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_LAYER_H
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