mirror of
https://github.com/xiaoqidun/ofdgo.git
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107 lines
3.4 KiB
Go
107 lines
3.4 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 "fmt"
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// ggStrokeFiller 将仅用于光栅填充的描边与可参与区域运算的轮廓分开
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type ggStrokeFiller interface {
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strokeFill(path GeometryPath, options StrokeOptions) (GeometryPath, error)
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}
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// ggNativeStroke 判断GG当前可保真处理的描边范围
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// 入参: command 描边指令, scale 每毫米像素数
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// 返回: bool 是否可使用原生描边
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func ggNativeStroke(command RasterCommand, scale float64) bool {
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if command.Paint.Gradient != nil && command.Stroke.Width*scale < 1 {
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return false
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}
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joins := command.Stroke.Join == "" || command.Stroke.Join == "Miter"
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dashed := false
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for _, value := range command.Stroke.Dashes {
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dashed = dashed || value > 0
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}
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segments := 0
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for _, segment := range command.Path {
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switch segment.Verb {
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case RasterMove:
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segments = 0
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case RasterLine, RasterQuad, RasterCubic:
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segments++
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if joins && segments > 1 {
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return false
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}
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if dashed && segment.Verb != RasterLine {
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return false
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}
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case RasterClose:
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if dashed || joins {
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return false
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}
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}
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}
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return true
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}
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// expandStroke 使用显式几何提供者展开GG尚不可靠的描边，不切换光栅后端
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// 入参: command 描边指令
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// 返回: RasterCommand 等价填充指令, error 能力或几何错误
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func (b GGBackend) expandStroke(command RasterCommand) (RasterCommand, error) {
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if b.StrokeGeometry == nil {
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return RasterCommand{}, fmt.Errorf("GG stroke geometry: %w", ErrBackendUnavailable)
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}
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values := command.Transform
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matrix := Matrix{a: values[0], b: values[1], c: values[2], d: values[3], e: values[4], f: values[5]}
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path, err := b.StrokeGeometry.Transform(geometryFromRaster(command.Path), matrix)
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if err != nil {
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return RasterCommand{}, err
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}
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if filler, ok := b.StrokeGeometry.(ggStrokeFiller); ok {
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path, err = filler.strokeFill(path, *command.Stroke)
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} else {
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path, err = b.StrokeGeometry.Stroke(path, *command.Stroke)
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}
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if err != nil {
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return RasterCommand{}, err
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}
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path, err = path.Curves(.0001)
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if err != nil {
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return RasterCommand{}, err
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}
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if command.Paint.Gradient != nil {
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inverse, ok := matrix.Invert()
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if !ok {
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return RasterCommand{}, fmt.Errorf("invalid stroke gradient transform")
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}
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path, err = b.StrokeGeometry.Transform(path, inverse)
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if err != nil {
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return RasterCommand{}, err
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}
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} else {
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command.Transform = RasterMatrix{1, 0, 0, 1, 0, 0}
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}
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command.Path = make([]RasterSegment, len(path))
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for i, s := range path {
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verb := RasterVerb(s.Verb)
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if s.Verb == GeometryClose {
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verb = RasterClose
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}
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command.Path[i] = RasterSegment{Verb: verb, End: RasterPoint{s.End.X, s.End.Y}, Control1: RasterPoint{s.Control1.X, s.Control1.Y}, Control2: RasterPoint{s.Control2.X, s.Control2.Y}}
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}
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command.Stroke = nil
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command.EvenOdd = false
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return command, nil
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}
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