mirror of
https://github.com/xiaoqidun/ofdgo.git
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54 lines
1.9 KiB
Go
54 lines
1.9 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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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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package ofdgo
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import (
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"image"
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"github.com/tdewolff/canvas"
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)
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// canvasBackendState 保存Canvas字体、字形和编码图片适配缓存
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type canvasBackendState struct {
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images renderCache[*EncodedImage, image.Image]
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fontMap map[string]*canvas.FontFamily
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svgFontCache map[*canvas.Font]SVGFont
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textGlyphPathCache renderCache[textGlyphPathCacheKey, textGlyphPathCacheValue]
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fontOutlines map[*canvas.Font]*sfntOutliner
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}
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// canvasState 获取当前渲染器的Canvas私有缓存，按需创建且不向其他后端暴露
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// 返回: *canvasBackendState Canvas缓存
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func (r *Renderer) canvasState() *canvasBackendState {
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key := CanvasBackend{}
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if state, ok := r.backendStates[key]; ok {
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return state.(*canvasBackendState)
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}
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state := &canvasBackendState{
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images: renderCache[*EncodedImage, image.Image]{limit: imageCacheLimit},
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}
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state.resetFonts()
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r.backendStates[key] = state
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return state
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}
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// resetFonts 清除Canvas字体及字形缓存，保留编码图片适配对象
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func (s *canvasBackendState) resetFonts() {
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s.fontMap = make(map[string]*canvas.FontFamily)
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s.svgFontCache = make(map[*canvas.Font]SVGFont)
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s.textGlyphPathCache = renderCache[textGlyphPathCacheKey, textGlyphPathCacheValue]{limit: 16 << 20}
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s.fontOutlines = make(map[*canvas.Font]*sfntOutliner)
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}
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