diff --git a/ofdgo.go b/ofdgo.go
index 56c6305..dcb34f7 100644
--- a/ofdgo.go
+++ b/ofdgo.go
@@ -71,6 +71,8 @@ func NewRenderer(reader *Reader, opts ...RendererOption) *Renderer {
 		DrawParams:            reader.drawParamCache,
 		CompositeGraphicUnits: reader.compositeGraphicUnitCache,
 		FontMap:               make(map[string]*canvas.FontFamily),
+		FontGIDMap:            make(map[string]map[uint16]rune),
+		FontCIDMap:            make(map[string]map[uint16]rune),
 		fontFSCache:           make(map[fontFSKey]*canvas.FontFamily),
 		textGlyphPathCache:    make(map[textGlyphPathCacheKey]textGlyphPathCacheValue),
 		templatePageCache:     make(map[string]*PageContent),
diff --git a/ofdgo_image.go b/ofdgo_image.go
index 42793c2..d188a50 100644
--- a/ofdgo_image.go
+++ b/ofdgo_image.go
@@ -20,10 +20,12 @@ import (
 	"fmt"
 	"image"
 	"image/color"
+	_ "image/gif"
 
 	canvasimage "github.com/tdewolff/canvas/image"
 	_ "github.com/xiaoqidun/jbig2"
 	_ "golang.org/x/image/bmp"
+	_ "golang.org/x/image/tiff"
 )
 
 // decodeImageData 解码图片数据
diff --git a/ofdgo_renderer.go b/ofdgo_renderer.go
index 926042f..6081d97 100644
--- a/ofdgo_renderer.go
+++ b/ofdgo_renderer.go
@@ -48,6 +48,15 @@ type RendererOption func(*Renderer)
 // 入参: page 页面内容
 // 返回: *canvas.Canvas 画布实例, error 错误信息
 func (r *Renderer) RenderPage(page *PageContent) (*canvas.Canvas, error) {
+	renderer := *r
+	renderer.decodeImages = true
+	return renderer.renderPage(page)
+}
+
+// renderPage 渲染特定页面内容
+// 入参: page 页面内容
+// 返回: *canvas.Canvas 画布实例, error 错误信息
+func (r *Renderer) renderPage(page *PageContent) (*canvas.Canvas, error) {
 	box, err := r.GetPageBox(page)
 	if err != nil {
 		return nil, err
@@ -55,7 +64,7 @@ func (r *Renderer) RenderPage(page *PageContent) (*canvas.Canvas, error) {
 	width, height := box.W, box.H
 	c := canvas.New(width, height)
 	ctx := canvas.NewContext(c)
-	if err := r.RenderPageToContext(ctx, page); err != nil {
+	if err := r.renderPageToContext(ctx, page, true); err != nil {
 		return nil, err
 	}
 	return c, nil
@@ -85,7 +94,9 @@ func (r *Renderer) GetPageBox(page *PageContent) (Box, error) {
 // 入参: ctx 画布上下文, page 页面内容
 // 返回: error 错误信息
 func (r *Renderer) RenderPageToContext(ctx *canvas.Context, page *PageContent) error {
-	return r.renderPageToContext(ctx, page, true)
+	renderer := *r
+	renderer.decodeImages = true
+	return renderer.renderPageToContext(ctx, page, true)
 }
 
 // renderPageToContext 渲染页面到指定上下文
diff --git a/ofdgo_renderer_output.go b/ofdgo_renderer_output.go
index 2ad0de3..031e78f 100644
--- a/ofdgo_renderer_output.go
+++ b/ofdgo_renderer_output.go
@@ -30,9 +30,7 @@ import (
 // 入参: page 页面内容
 // 返回: image.Image 图像对象, error 错误信息
 func (r *Renderer) RenderToImage(page *PageContent) (image.Image, error) {
-	renderer := *r
-	renderer.decodeImages = true
-	c, err := renderer.RenderPage(page)
+	c, err := r.RenderPage(page)
 	if err != nil {
 		return nil, err
 	}
@@ -44,7 +42,7 @@ func (r *Renderer) RenderToImage(page *PageContent) (image.Image, error) {
 // 入参: page 页面内容, writer 输出流
 // 返回: error 错误信息
 func (r *Renderer) RenderToSVG(page *PageContent, writer io.Writer) error {
-	c, err := r.RenderPage(page)
+	c, err := r.renderPage(page)
 	if err != nil {
 		return err
 	}
@@ -69,7 +67,7 @@ func replacePDFProducer(data []byte) []byte {
 // 入参: page 页面内容, writer 输出流
 // 返回: error 错误信息
 func (r *Renderer) RenderToPDF(page *PageContent, writer io.Writer) error {
-	c, err := r.RenderPage(page)
+	c, err := r.renderPage(page)
 	if err != nil {
 		return err
 	}
@@ -88,7 +86,7 @@ func (r *Renderer) RenderToPDF(page *PageContent, writer io.Writer) error {
 // 入参: page 页面内容, writer 输出流
 // 返回: error 错误信息
 func (r *Renderer) RenderToEPS(page *PageContent, writer io.Writer) error {
-	c, err := r.RenderPage(page)
+	c, err := r.renderPage(page)
 	if err != nil {
 		return err
 	}
@@ -113,7 +111,7 @@ func (r *Renderer) RenderToMultiPagePDF(writer io.Writer) error {
 		if err != nil {
 			continue
 		}
-		c, err := r.RenderPage(page)
+		c, err := r.renderPage(page)
 		if err != nil {
 			continue
 		}