mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
76 lines
2.1 KiB
Go
76 lines
2.1 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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"fmt"
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"github.com/tdewolff/canvas"
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)
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// loadFont 加载字体，绘图别名按数据和样式隔离，不改动原始字体名称
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// 入参: fontID 字体ID
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// 返回: *canvas.FontFamily 字体族
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func (r *Renderer) loadFont(fontID string) *canvas.FontFamily {
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if ff, ok := r.canvasState().fontMap[fontID]; ok {
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return ff
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}
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resolved, err := r.PrepareFont(fontID)
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if err != nil {
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r.renderError = err
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return nil
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}
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of := r.Reader.fontCache[fontID]
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if len(resolved.Data) == 0 {
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return nil
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}
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if of == nil {
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of = &Font{ID: fontID, FontName: "OFDGoFallback"}
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}
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fontData := resolved.Data
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fontStyle := canvasFontStyle(of)
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if resolved.digest == ([32]byte{}) {
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resolved.digest = r.fontDigest(fontData)
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}
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key := canvasFontKey{digest: resolved.digest, name: of.FontName, style: fontStyle}
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cache := r.canvasFontFamilies()
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if ff, ok := cache.get(key); ok {
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r.canvasState().fontMap[fontID] = ff
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return ff
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}
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ff := canvas.NewFontFamily(fmt.Sprintf("ofdgo-%x-%d", resolved.digest, fontStyle))
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if err := ff.LoadFont(fontData, 0, fontStyle); err != nil {
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r.renderError = err
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return nil
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}
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r.canvasState().fontMap[fontID] = ff
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cache.put(key, ff, min(len(fontData), cache.limit)*8+256)
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return ff
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}
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// canvasFontStyle 获取Canvas字体样式
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// 入参: font OFD字体定义
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// 返回: canvas.FontStyle Canvas字体样式
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func canvasFontStyle(font *Font) canvas.FontStyle {
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var style canvas.FontStyle
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if font.Bold {
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style |= canvas.FontBold
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}
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if font.Italic {
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style |= canvas.FontItalic
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}
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return style
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}
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