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/*
* Copyright (C) 2013 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_ASSET_ATLAS_H
#define ANDROID_HWUI_ASSET_ATLAS_H
#include <GLES2/gl2.h>
#include <ui/GraphicBuffer.h>
#include <utils/KeyedVector.h>
#include <cutils/compiler.h>
#include <SkBitmap.h>
#include "Image.h"
#include "Texture.h"
#include "UvMapper.h"
namespace android {
namespace uirenderer {
class Caches;
/**
* An asset atlas holds a collection of framework bitmaps in a single OpenGL
* texture. Each bitmap is associated with a location, defined in pixels,
* inside the atlas. The atlas is generated by the framework and bound as
* an external texture using the EGLImageKHR extension.
*/
class AssetAtlas {
public:
/**
* Entry representing the position and rotation of a
* bitmap inside the atlas.
*/
struct Entry {
/**
* The bitmap that generated this atlas entry.
*/
SkBitmap* bitmap;
/**
* Location of the bitmap inside the atlas, in pixels.
*/
int x;
int y;
/**
* If set, the bitmap is rotated 90 degrees (clockwise)
* inside the atlas.
*/
bool rotated;
/*
* A "virtual texture" object that represents the texture
* this entry belongs to. This texture should never be
* modified.
*/
Texture* texture;
/**
* Maps texture coordinates in the [0..1] range into the
* correct range to sample this entry from the atlas.
*/
const UvMapper uvMapper;
/**
* Atlas this entry belongs to.
*/
const AssetAtlas& atlas;
/**
* Unique identifier used to merge bitmaps and 9-patches stored
* in the atlas.
*/
const void* getMergeId() const {
return texture->blend ? &atlas.mBlendKey : &atlas.mOpaqueKey;
}
private:
Entry(SkBitmap* bitmap, int x, int y, bool rotated,
Texture* texture, const UvMapper& mapper, const AssetAtlas& atlas):
bitmap(bitmap), x(x), y(y), rotated(rotated),
texture(texture), uvMapper(mapper), atlas(atlas) {
}
~Entry() {
delete texture;
}
friend class AssetAtlas;
};
AssetAtlas(): mTexture(NULL), mImage(NULL), mGenerationId(0),
mBlendKey(true), mOpaqueKey(false) { }
~AssetAtlas() { terminate(); }
/**
* Initializes the atlas with the specified buffer and
* map. The buffer is a gralloc'd texture that will be
* used as an EGLImage. The map is a list of SkBitmap*
* and their (x, y) positions as well as their rotation
* flags.
*
* This method returns immediately if the atlas is already
* initialized. To re-initialize the atlas, you must
* first call terminate().
*/
ANDROID_API void init(sp<GraphicBuffer> buffer, int64_t* map, int count);
/**
* Destroys the atlas texture. This object can be
* re-initialized after calling this method.
*
* After calling this method, the width, height
* and texture are set to 0.
*/
ANDROID_API void terminate();
/**
* Returns the width of this atlas in pixels.
* Can return 0 if the atlas is not initialized.
*/
uint32_t getWidth() const {
return mTexture ? mTexture->width : 0;
}
/**
* Returns the height of this atlas in pixels.
* Can return 0 if the atlas is not initialized.
*/
uint32_t getHeight() const {
return mTexture ? mTexture->height : 0;
}
/**
* Returns the OpenGL name of the texture backing this atlas.
* Can return 0 if the atlas is not initialized.
*/
GLuint getTexture() const {
return mTexture ? mTexture->id : 0;
}
/**
* Returns the entry in the atlas associated with the specified
* bitmap. If the bitmap is not in the atlas, return NULL.
*/
Entry* getEntry(const SkBitmap* bitmap) const;
/**
* Returns the texture for the atlas entry associated with the
* specified bitmap. If the bitmap is not in the atlas, return NULL.
*/
Texture* getEntryTexture(const SkBitmap* bitmap) const;
/**
* Returns the current generation id of the atlas.
*/
uint32_t getGenerationId() const {
return mGenerationId;
}
private:
void createEntries(Caches& caches, int64_t* map, int count);
Texture* mTexture;
Image* mImage;
uint32_t mGenerationId;
const bool mBlendKey;
const bool mOpaqueKey;
KeyedVector<const SkBitmap*, Entry*> mEntries;
}; // class AssetAtlas
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_ASSET_ATLAS_H
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