mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 15:06:46 +08:00
58 lines
2.1 KiB
Go
58 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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"bytes"
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"crypto/sha256"
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"fmt"
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"io"
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)
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// PreviewOptions 指定页面显示方式，光栅预览不提供SVG对象分组
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type PreviewOptions struct {
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Raster bool
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Objects bool
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}
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// RenderPreview 生成统一SVG容器及独立资源，原生程序与WebUI使用相同绘制入口
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// 入参: page 页面内容, writer 输出流, options 显示方式
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// 返回: SVGResources 需由调用方映射地址的资源, error 错误信息
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func (r *Renderer) RenderPreview(page *PageContent, writer io.Writer, options PreviewOptions) (SVGResources, error) {
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if !options.Raster {
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if options.Objects {
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return r.RenderToSVGWithObjects(page, writer)
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}
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return r.RenderToSVGWithResources(page, writer)
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}
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if options.Objects {
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return SVGResources{}, fmt.Errorf("raster preview does not provide SVG object groups")
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}
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box, err := r.GetPageBox(page)
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if err != nil {
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return SVGResources{}, err
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}
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var pixels bytes.Buffer
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if err := r.RenderToPNG(page, &pixels); err != nil {
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return SVGResources{}, err
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}
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name := fmt.Sprintf("ofdgo-image-%x", sha256.Sum256(pixels.Bytes()))
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_, err = fmt.Fprintf(writer, `<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="%gmm" height="%gmm" viewBox="0 0 %g %g"><image width="%g" height="%g" preserveAspectRatio="none" xlink:href="%s"/></svg>`, box.W, box.H, box.W, box.H, box.W, box.H, name)
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if err != nil {
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return SVGResources{}, err
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}
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return SVGResources{Images: []SVGImage{{Name: name, MIME: "image/png", Data: pixels.Bytes()}}}, nil
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}
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