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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_TEXT_DROP_SHADOW_CACHE_H
#define ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H
#include <GLES2/gl2.h>
#include <SkPaint.h>
#include "utils/GenerationCache.h"
#include "FontRenderer.h"
#include "Texture.h"
namespace android {
namespace uirenderer {
struct ShadowText {
ShadowText() {
text = NULL;
}
ShadowText(SkPaint* paint, uint32_t radius, uint32_t len, const char* srcText):
radius(radius), len(len) {
text = new char[len];
memcpy(text, srcText, len);
textSize = paint->getTextSize();
typeface = paint->getTypeface();
hash = 0;
uint32_t multiplier = 1;
for (uint32_t i = 0; i < len; i++) {
hash += text[i] * multiplier;
uint32_t shifted = multiplier << 5;
multiplier = shifted - multiplier;
}
}
ShadowText(const ShadowText& shadow):
radius(shadow.radius), len(shadow.len), hash(shadow.hash),
textSize(shadow.textSize), typeface(shadow.typeface) {
text = new char[shadow.len];
memcpy(text, shadow.text, shadow.len);
}
~ShadowText() {
delete[] text;
}
uint32_t radius;
uint32_t len;
uint32_t hash;
float textSize;
SkTypeface* typeface;
char *text;
bool operator<(const ShadowText& rhs) const {
if (hash < rhs.hash) return true;
else if (hash == rhs.hash) {
if (len < rhs.len) return true;
else if (len == rhs.len) {
if (radius < rhs.radius) return true;
else if (radius == rhs.radius) {
if (textSize < rhs.textSize) return true;
else if (textSize == rhs.textSize) {
if (typeface < rhs.typeface) return true;
else if (typeface == rhs.typeface) {
return strncmp(text, rhs.text, len) < 0;
}
}
}
}
}
return false;
}
}; // struct ShadowText
/**
* Alpha texture used to represent a shadow.
*/
struct ShadowTexture: public Texture {
ShadowTexture(): Texture() {
}
float left;
float top;
}; // struct ShadowTexture
class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
public:
TextDropShadowCache();
TextDropShadowCache(uint32_t maxByteSize);
~TextDropShadowCache();
/**
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
*/
void operator()(ShadowText& text, ShadowTexture*& texture);
ShadowTexture* get(SkPaint* paint, const char* text, uint32_t len,
int numGlyphs, uint32_t radius);
/**
* Clears the cache. This causes all textures to be deleted.
*/
void clear();
void setFontRenderer(FontRenderer& fontRenderer) {
mRenderer = &fontRenderer;
}
/**
* Sets the maximum size of the cache in bytes.
*/
void setMaxSize(uint32_t maxSize);
/**
* Returns the maximum size of the cache in bytes.
*/
uint32_t getMaxSize();
/**
* Returns the current size of the cache in bytes.
*/
uint32_t getSize();
private:
GenerationCache<ShadowText, ShadowTexture*> mCache;
uint32_t mSize;
uint32_t mMaxSize;
FontRenderer* mRenderer;
}; // class TextDropShadowCache
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_TEXT_DROP_SHADOW_CACHE_H