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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <GLES2/gl2.h>
#include <SkPaint.h>
#include <utils/LruCache.h>
#include <utils/String16.h>
#include "FontRenderer.h"
#include "Texture.h"
namespace android {
namespace uirenderer {
class Caches;
struct ShadowText {
ShadowText(): len(0), radius(0.0f), textSize(0.0f), typeface(NULL),
flags(0), italicStyle(0.0f), scaleX(0), text(NULL), positions(NULL) {
// len is the number of bytes in text
ShadowText(const SkPaint* paint, float radius, uint32_t len, const char* srcText,
const float* positions):
len(len), radius(radius), positions(positions) {
// TODO: Propagate this through the API, we should not cast here
text = (const char16_t*) srcText;
textSize = paint->getTextSize();
typeface = paint->getTypeface();
flags = 0;
if (paint->isFakeBoldText()) {
flags |= Font::kFakeBold;
italicStyle = paint->getTextSkewX();
scaleX = paint->getTextScaleX();
~ShadowText() {
hash_t hash() const;
static int compare(const ShadowText& lhs, const ShadowText& rhs);
bool operator==(const ShadowText& other) const {
return compare(*this, other) == 0;
bool operator!=(const ShadowText& other) const {
return compare(*this, other) != 0;
void copyTextLocally() {
uint32_t charCount = len / sizeof(char16_t);
str.setTo((const char16_t*) text, charCount);
text = str.string();
if (positions != NULL) {
positionsCopy.appendArray(positions, charCount * 2);
positions = positionsCopy.array();
uint32_t len;
float radius;
float textSize;
SkTypeface* typeface;
uint32_t flags;
float italicStyle;
float scaleX;
const char16_t* text;
const float* positions;
// Not directly used to compute the cache key
String16 str;
Vector<float> positionsCopy;
}; // struct ShadowText
// Caching support
inline int strictly_order_type(const ShadowText& lhs, const ShadowText& rhs) {
return ShadowText::compare(lhs, rhs) < 0;
inline int compare_type(const ShadowText& lhs, const ShadowText& rhs) {
return ShadowText::compare(lhs, rhs);
inline hash_t hash_type(const ShadowText& entry) {
return entry.hash();
* Alpha texture used to represent a shadow.
struct ShadowTexture: public Texture {
ShadowTexture(Caches& caches): Texture(caches) {
float left;
float top;
}; // struct ShadowTexture
class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
TextDropShadowCache(uint32_t maxByteSize);
* Used as a callback when an entry is removed from the cache.
* Do not invoke directly.
void operator()(ShadowText& text, ShadowTexture*& texture);
ShadowTexture* get(const SkPaint* paint, const char* text, uint32_t len,
int numGlyphs, float radius, const float* positions);
* 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();
void init();
LruCache<ShadowText, ShadowTexture*> mCache;
uint32_t mSize;
uint32_t mMaxSize;
FontRenderer* mRenderer;
bool mDebugEnabled;
}; // class TextDropShadowCache
}; // namespace uirenderer
}; // namespace android