152 lines
4.0 KiB
C++
152 lines
4.0 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_UI_TEXT_DROP_SHADOW_CACHE_H
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#define ANDROID_UI_TEXT_DROP_SHADOW_CACHE_H
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#include <GLES2/gl2.h>
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#include <SkPaint.h>
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#include "utils/GenerationCache.h"
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#include "FontRenderer.h"
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#include "Texture.h"
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namespace android {
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namespace uirenderer {
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struct ShadowText {
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ShadowText() {
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text = NULL;
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}
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ShadowText(SkPaint* paint, uint32_t radius, uint32_t len, const char* srcText):
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radius(radius), len(len) {
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text = new char[len];
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memcpy(text, srcText, len);
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textSize = paint->getTextSize();
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typeface = paint->getTypeface();
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hash = 0;
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uint32_t multiplier = 1;
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for (uint32_t i = 0; i < len; i++) {
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hash += text[i] * multiplier;
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uint32_t shifted = multiplier << 5;
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multiplier = shifted - multiplier;
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}
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}
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ShadowText(const ShadowText& shadow):
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radius(shadow.radius), len(shadow.len), hash(shadow.hash),
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textSize(shadow.textSize), typeface(shadow.typeface) {
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text = new char[shadow.len];
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memcpy(text, shadow.text, shadow.len);
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}
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~ShadowText() {
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delete[] text;
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}
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uint32_t radius;
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uint32_t len;
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uint32_t hash;
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float textSize;
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SkTypeface* typeface;
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char *text;
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bool operator<(const ShadowText& rhs) const {
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if (hash < rhs.hash) return true;
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else if (hash == rhs.hash) {
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if (len < rhs.len) return true;
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else if (len == rhs.len) {
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if (radius < rhs.radius) return true;
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else if (radius == rhs.radius) {
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if (textSize < rhs.textSize) return true;
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else if (textSize == rhs.textSize) {
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if (typeface < rhs.typeface) return true;
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else if (typeface == rhs.typeface) {
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return strncmp(text, rhs.text, len) < 0;
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}
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}
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}
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}
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}
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return false;
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}
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}; // struct ShadowText
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/**
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* Alpha texture used to represent a shadow.
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*/
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struct ShadowTexture: public Texture {
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ShadowTexture(): Texture() {
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}
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float left;
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float top;
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}; // struct ShadowTexture
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class TextDropShadowCache: public OnEntryRemoved<ShadowText, ShadowTexture*> {
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public:
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TextDropShadowCache();
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TextDropShadowCache(uint32_t maxByteSize);
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~TextDropShadowCache();
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/**
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* Used as a callback when an entry is removed from the cache.
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* Do not invoke directly.
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*/
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void operator()(ShadowText& text, ShadowTexture*& texture);
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ShadowTexture* get(SkPaint* paint, const char* text, uint32_t len,
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int numGlyphs, uint32_t radius);
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/**
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* Clears the cache. This causes all textures to be deleted.
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*/
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void clear();
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void setFontRenderer(FontRenderer& fontRenderer) {
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mRenderer = &fontRenderer;
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}
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/**
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* Sets the maximum size of the cache in bytes.
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*/
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void setMaxSize(uint32_t maxSize);
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/**
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* Returns the maximum size of the cache in bytes.
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*/
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uint32_t getMaxSize();
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/**
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* Returns the current size of the cache in bytes.
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*/
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uint32_t getSize();
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private:
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GenerationCache<ShadowText, ShadowTexture*> mCache;
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uint32_t mSize;
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uint32_t mMaxSize;
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FontRenderer* mRenderer;
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}; // class TextDropShadowCache
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_UI_TEXT_DROP_SHADOW_CACHE_H
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