feat(内存占用): 优化数值解析与页面缓存，减少内存分配和重复处理

assets/webui/ofdgo.js

@@ -53,7 +53,6 @@ const state = {
 	pageObserver: null,
 	visiblePages: new Set(),
 	scrollFrame: 0,
-	thumbnailCache: new Map(),
 	thumbnailInFlight: new Set(),
 	thumbnailObserver: null,
 	visibleThumbnails: new Set(),
@@ -1549,7 +1548,6 @@ async function processPageRenderQueue() {
 				const page = await callWASM("ofdgoRenderPage", task.index);
 				if (task.openSeq === state.openSeq) {
 					state.pageCache.set(task.index, page);
-					cacheThumbnail(task.index, page.svg);
 				}
 				task.resolve(page);
 			} catch (err) {
@@ -1809,7 +1807,7 @@ function renderPageList() {
 		const thumb = document.createElement("span");
 		thumb.className = "thumb-paper";
 		thumb.setAttribute("aria-hidden", "true");
-		setThumbnailContent(thumb, state.thumbnailCache.get(page.index), page.index, openSeq);
+		setThumbnailContent(thumb, state.pageCache.get(page.index)?.svg, page.index, openSeq);
 
 		const label = document.createElement("span");
 		label.className = "thumb-label";
@@ -1831,7 +1829,6 @@ function renderPageList() {
 }
 
 function resetThumbnails() {
-	state.thumbnailCache.clear();
 	state.visibleThumbnails.clear();
 	state.thumbnailInFlight.clear();
 	if (state.thumbnailObserver) {
@@ -1840,12 +1837,6 @@ function resetThumbnails() {
 	}
 }
 
-function cacheThumbnail(index, svgText) {
-	if (typeof svgText === "string" && svgText) {
-		state.thumbnailCache.set(index, svgText);
-	}
-}
-
 function setThumbnailContent(container, svgText, index, openSeq = state.openSeq) {
 	const renderKey = `${openSeq}:${index}`;
 	if (svgText && container.dataset.renderKey === renderKey) {
@@ -1923,7 +1914,7 @@ async function renderThumbnail(index, openSeq = state.openSeq) {
 	if (openSeq !== state.openSeq || !state.doc) {
 		return;
 	}
-	if (state.thumbnailCache.has(index)) {
+	if (state.pageCache.has(index)) {
 		updateThumbnail(index, openSeq);
 		return;
 	}
@@ -1956,7 +1947,7 @@ function updateThumbnail(index, openSeq = state.openSeq) {
 	}
 	const thumb = el.pageList.querySelector(`[data-page-index="${index}"] .thumb-paper`);
 	if (thumb) {
-		setThumbnailContent(thumb, state.thumbnailCache.get(index), index, openSeq);
+		setThumbnailContent(thumb, state.pageCache.get(index)?.svg, index, openSeq);
 	}
 }
 

ofdgo_geom.go

@@ -17,6 +17,7 @@ package ofdgo
 import (
 	"fmt"
 	"math"
+	"slices"
 	"strconv"
 	"strings"
 )
@@ -30,17 +31,21 @@ type Box struct {
 // 入参: s 字符串
 // 返回: Box 矩形对象, error 错误信息
 func ParseBox(s string) (Box, error) {
-	parts := strings.Fields(s)
+	var values [4]float64
-	if len(parts) != 4 {
+	i := 0
+	for part := range strings.FieldsSeq(s) {
+		if i == len(values) {
 			return Box{}, fmt.Errorf("invalid box: %s", s)
 		}
-	var values [4]float64
-	for i, part := range parts {
 		value, err := strconv.ParseFloat(part, 64)
 		if err != nil {
 			return Box{}, fmt.Errorf("invalid box: %s", s)
 		}
 		values[i] = value
+		i++
+	}
+	if i != len(values) {
+		return Box{}, fmt.Errorf("invalid box: %s", s)
 	}
 	return Box{X: values[0], Y: values[1], W: values[2], H: values[3]}, nil
 }
@@ -146,11 +151,10 @@ func parseFloats(s string) []float64 {
 // 入参: s 字符串
 // 返回: []float64 浮点数数组
 func parseFloatsWithG(s string) []float64 {
-	parts := strings.Fields(s)
 	var result []float64
 	gFlag := false
 	gCount := 0
-	for _, p := range parts {
+	for p := range strings.FieldsSeq(s) {
 		if p == "g" {
 			gFlag = true
 			continue
@@ -166,6 +170,7 @@ func parseFloatsWithG(s string) []float64 {
 		}
 		if gCount > 0 {
 			v, _ := strconv.ParseFloat(p, 64)
+			result = slices.Grow(result, gCount)
 			for j := 0; j < gCount; j++ {
 				result = append(result, v)
 			}