mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
235 lines
8.2 KiB
Go
235 lines
8.2 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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"crypto/sha256"
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"slices"
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)
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// stampContentKey 区分印章内容、物理尺寸、裁剪与字体栅格化精度，不含放置位置
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type stampContentKey struct {
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data [32]byte
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kind string
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width, height float64
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dpi float64
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clip Box
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clipped bool
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annotations bool
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}
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// stampContentState 保存有界的共享签章编译结果及配置
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type stampContentState struct {
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config RenderBackends
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cache renderCache[stampContentKey, []RasterCommand]
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}
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// stampContentStateKey 隔离渲染器私有的共享签章数据
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type stampContentStateKey struct{}
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// resetFonts 使包含文字的签章编译结果随字体配置失效
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func (s *stampContentState) resetFonts() {
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s.cache = renderCache[stampContentKey, []RasterCommand]{limit: 16 << 20}
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}
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// sharedStamp 复用相同签章的解码、嵌套文档编译及局部裁剪，不缓存放置位置
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// 入参: stamp 签章, compile 未缓存的签章编译方法
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// 返回: error 签章解析或编译错误
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func (c *semanticCompiler) sharedStamp(stamp Stamp, compile func(*semanticCompiler, Stamp) error) error {
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if c.textOnly || c.measure || len(stamp.Data) == 0 {
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return nil
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}
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r := c.renderer
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state, _ := r.backendStates[stampContentStateKey{}].(*stampContentState)
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config := r.backends
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if state == nil || !sameBackend(state.config.Fonts, config.Fonts) || !sameBackend(state.config.Geometry, config.Geometry) ||
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!sameBackend(state.config.Compiler, config.Compiler) || !sameBackend(state.config.Raster, config.Raster) {
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state = &stampContentState{config: config}
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state.resetFonts()
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r.backendStates[stampContentStateKey{}] = state
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}
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key := stampContentKey{data: sha256.Sum256(stamp.Data), kind: stamp.Type, width: stamp.Box.W, height: stamp.Box.H, dpi: c.page.DPI, clipped: stamp.Clip != nil, annotations: r.RenderAnnotations}
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if stamp.Clip != nil {
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key.clip = *stamp.Clip
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}
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commands, ok := state.cache.get(key)
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if !ok {
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local := stamp
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local.Box.X, local.Box.Y = 0, 0
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page := &RasterPage{Width: c.page.Width, Height: c.page.Height, DPI: c.page.DPI}
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child := &semanticCompiler{renderer: r, geometry: c.geometry, page: page, patterns: c.patterns}
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if err := compile(child, local); err != nil {
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return err
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}
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commands = page.Commands
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cost := 0
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for _, command := range commands {
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cost += rasterCommandCost(command)
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if command.Image != nil {
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bounds := command.Image.Bounds()
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cost += bounds.Dx() * bounds.Dy() * 4
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}
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}
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state.cache.put(key, commands, cost)
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}
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c.page.Commands = append(c.page.Commands, translatePatternCommands(commands, stamp.Box.X, stamp.Box.Y)...)
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return nil
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}
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// patternCellKey 区分共享底纹、颜色、透明度和影响单元语义的页面变换
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type patternCellKey struct {
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pattern *Pattern
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color, space string
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index, alpha int
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colorAlpha int
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matrix [6]float64
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}
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// patternCell 复用同次编译中相同底纹单元，不缓存外部对象的裁剪
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// 入参: pattern 底纹画刷, matrix 单元到页面矩阵
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// 返回: []RasterCommand 只读单元指令, error 编译错误
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func (c *semanticCompiler) patternCell(pattern *PatternPaint, matrix Matrix) ([]RasterCommand, error) {
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x, y := 0.0, 0.0
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if patternCellTranslatable(pattern) {
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x, y = matrix.e, matrix.f
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matrix.e, matrix.f = 0, 0
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}
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key := patternCellKey{pattern: pattern.Pattern, color: pattern.Color.Value, space: pattern.Color.ColorSpace, index: -1, alpha: 255, colorAlpha: 255, matrix: matrix.Values()}
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if pattern.Color.Index != nil {
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key.index = *pattern.Color.Index
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}
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if pattern.Alpha != nil {
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key.alpha = *pattern.Alpha
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}
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if pattern.Color.Alpha != nil {
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key.colorAlpha = *pattern.Color.Alpha
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}
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if commands, ok := c.patterns.get(key); ok {
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return translatePatternCommands(commands, x, y), nil
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}
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child := &semanticCompiler{renderer: c.renderer, geometry: c.geometry, page: &RasterPage{Width: c.page.Width, Height: c.page.Height, DPI: c.page.DPI}, pattern: true, patterns: c.patterns}
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defaults := &DrawParam{FillColor: &pattern.Color, StrokeColor: (*StrokeColor)(&pattern.Color)}
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for _, object := range pattern.CellContent.Objects {
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object = mergeGraphicObjectAlpha(object, pattern.Alpha)
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if err := c.renderer.WalkObject(&object, RenderState{Defaults: defaults, Parent: &matrix, BoundaryInCTM: true}, child); err != nil {
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return nil, err
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}
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}
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cost := 0
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for _, cmd := range child.page.Commands {
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cost += rasterCommandCost(cmd)
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}
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c.patterns.put(key, child.page.Commands, cost)
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return translatePatternCommands(child.page.Commands, x, y), nil
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}
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// patternCellTranslatable 检查无需按页面位置重新解释的叶子单元
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// 入参: pattern 底纹画刷
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// 返回: bool 是否可仅平移编译结果
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func patternCellTranslatable(pattern *PatternPaint) bool {
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if pattern.Color.Pattern != nil {
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return false
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}
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for _, object := range pattern.CellContent.Objects {
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var fill, stroke *FillColor
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switch object.Type {
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case "PathObject":
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if object.PathObject.DrawParam != "" {
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return false
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}
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fill, stroke = object.PathObject.FillColor, (*FillColor)(object.PathObject.StrokeColor)
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case "TextObject":
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if object.TextObject.DrawParam != "" {
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return false
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}
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fill, stroke = object.TextObject.FillColor, (*FillColor)(object.TextObject.StrokeColor)
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case "ImageObject":
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if object.ImageObject.Border != nil {
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stroke = (*FillColor)(object.ImageObject.Border.BorderColor)
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}
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default:
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return false
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}
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if fill != nil && fill.Pattern != nil || stroke != nil && stroke.Pattern != nil {
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return false
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}
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}
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return true
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}
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// translatePatternCommands 平移单元实例，共享只读路径和画刷，独立处理页面裁剪
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// 入参: commands 原点单元, x 横向平移, y 纵向平移
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// 返回: []RasterCommand 放置后的指令
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func translatePatternCommands(commands []RasterCommand, x, y float64) []RasterCommand {
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if x == 0 && y == 0 {
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return commands
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}
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result := slices.Clone(commands)
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for i := range result {
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command := &result[i]
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command.Transform[4] += x
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command.Transform[5] += y
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if command.Clip != nil {
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command.Clip = slices.Clone(command.Clip)
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matrix := RasterMatrix{1, 0, 0, 1, x, y}
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for j := range command.Clip {
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segment := &command.Clip[j]
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segment.End = matrix.Apply(segment.End)
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segment.Control1 = matrix.Apply(segment.Control1)
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segment.Control2 = matrix.Apply(segment.Control2)
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}
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}
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}
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return result
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}
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// appendPatternCell 将缓存指令放入当前裁剪，不修改单元数据
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// 入参: commands 单元指令, clip 页面裁剪, segments 已转换裁剪
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// 返回: error 裁剪合并错误
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func (c *semanticCompiler) appendPatternCell(commands []RasterCommand, clip GeometryPath, segments []RasterSegment) error {
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for _, command := range commands {
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commandClip := segments
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if command.Clip != nil {
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path := geometryFromRaster(command.Clip)
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combined, err := c.geometry.Combine(path, clip, GeometryIntersect)
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if err != nil {
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return err
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}
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commandClip, err = c.segments(combined)
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if err != nil {
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return err
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}
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}
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command.Clip = commandClip
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c.page.Commands = append(c.page.Commands, command)
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}
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return nil
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}
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// geometryFromRaster 将只含贝塞尔曲线的光栅路径还原为库路径
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// 入参: path 光栅路径
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// 返回: GeometryPath 库路径
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func geometryFromRaster(path []RasterSegment) GeometryPath {
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result := make(GeometryPath, 0, len(path))
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for _, s := range path {
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verb := GeometryVerb(s.Verb)
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if s.Verb == RasterClose {
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verb = GeometryClose
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}
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result = append(result, GeometrySegment{Verb: verb, End: Point{s.End.X, s.End.Y}, Control1: Point{s.Control1.X, s.Control1.Y}, Control2: Point{s.Control2.X, s.Control2.Y}})
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}
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return result
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}
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