render

package

v0.1.1 Latest Latest Go to latest Published: Sep 15, 2026 License: Unlicense Imports: 28 Imported by: 0

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Valid go.mod file
Redistributable license
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Repository

github.com/zc310/ofd

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Documentation ¶

Overview ¶

Package render 将解析后的 OFD 文档渲染为图形内容。

Index ¶

func Rasterize(c *canvas.Canvas, resolution canvas.Resolution, colorSpace canvas.ColorSpace) *image.RGBA
type CTColor
type Document
- func NewDocument(background color.Color, doc *parser.Document) *Document
- func NewDocumentWithDPI(background color.Color, doc *parser.Document, dpi canvas.Resolution) *Document
type Fonts
- func NewFonts(doc *parser.Document) *Fonts
type GlyphLayout
type TextLayout

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func Rasterize ¶ added in v0.1.1

func Rasterize(c *canvas.Canvas, resolution canvas.Resolution, colorSpace canvas.ColorSpace) *image.RGBA

Rasterize 将画布栅格化为 RGBA 图片。图片明显缩小时使用较快的双线性插值；其他图像仍使用 canvas 默认的 Catmull-Rom 插值。

Types ¶

type CTColor ¶

type CTColor struct {
	Value    *color.RGBA
	Gradient canvas.Gradient
}

type Document ¶

type Document struct {
	*parser.Document
	// contains filtered or unexported fields
}

func NewDocument ¶

func NewDocument(background color.Color, doc *parser.Document) *Document

func NewDocumentWithDPI ¶ added in v0.1.1

func NewDocumentWithDPI(background color.Color, doc *parser.Document, dpi canvas.Resolution) *Document

NewDocumentWithDPI 创建带有输出分辨率的渲染文档。 dpi 用于复合图元等内部离屏栅格化，不改变页面的物理尺寸。

func (*Document) AddFallbackFont ¶ added in v0.0.9

func (p *Document) AddFallbackFont(data []byte, family string, style canvas.FontStyle) error

AddFallbackFont 注册在文档字体未内嵌时使用的字体。

func (*Document) Annot ¶

func (p *Document) Annot(ctx *canvas.Context, annot *models.Annot, pb models.StBox)

func (*Document) Composite ¶ added in v0.0.5

func (p *Document) Composite(ctx *canvas.Context, object models.CompositeObject, dp *models.DrawParam, pb models.StBox)

Composite 绘制复合图元（CompositeObject）。

CompositeGraphicUnit 的内容位于自身的 [0,Width]x[0,Height] 坐标系中，先渲染完整单元，再使用 CompositeObject 的 Boundary 和 CTM 映射到页面，保留单元内部坐标，不根据透明像素重新裁剪内容。

func (*Document) Draw ¶

func (p *Document) Draw(ctx *canvas.Context, page *parser.Page) error

func (*Document) FallbackFontFamily ¶ added in v0.0.9

func (p *Document) FallbackFontFamily(id models.StRefID) string

FallbackFontFamily 返回为文档字体选择的外部字体族。

func (*Document) HasLoadedEmbeddedFont ¶ added in v0.0.9

func (p *Document) HasLoadedEmbeddedFont(id models.StRefID) bool

HasLoadedEmbeddedFont 判断文档字体是否可以作为内嵌字体族提供给浏览器。

func (*Document) Image ¶

func (p *Document) Image(ctx *canvas.Context, object models.ImageObject, dp *models.DrawParam, pb models.StBox)

func (*Document) Layer ¶

func (p *Document) Layer(ctx *canvas.Context, layer *models.Layer, pb models.StBox)

func (*Document) Page ¶

func (p *Document) Page(page *parser.Page) (*canvas.Canvas, error)

func (*Document) PageContent ¶

func (p *Document) PageContent(ctx *canvas.Context, page *parser.Page, seal bool)

func (*Document) Path ¶

func (p *Document) Path(ctx *canvas.Context, object models.PathObject, dp *models.DrawParam, pb models.StBox)

func (*Document) Seal ¶

func (p *Document) Seal(ctx *canvas.Context, info *parser.SealInfo, pb models.StBox) error

func (*Document) Template ¶

func (p *Document) Template(ctx *canvas.Context, template models.Template, pb models.StBox)

func (*Document) Text ¶

func (p *Document) Text(ctx *canvas.Context, object models.TextObject, dp *models.DrawParam, pb models.StBox)

func (*Document) TextLayouts ¶ added in v0.0.9

func (p *Document) TextLayouts(page *parser.Page) []TextLayout

TextLayouts 返回页面文字的字符级布局。字符步进使用渲染器的字体度量、 DeltaX/DeltaY、ReadDirection 和 CTM 基础计算，避免网页字体度量造成高亮偏移。

type Fonts ¶

type Fonts struct {
	*parser.Document
	Fonts map[models.StRefID]*canvas.FontFamily
	// contains filtered or unexported fields
}

func NewFonts ¶

func NewFonts(doc *parser.Document) *Fonts

func (*Fonts) AddFallbackFont ¶ added in v0.0.9

func (p *Fonts) AddFallbackFont(data []byte, family string, style canvas.FontStyle) error

AddFallbackFont 为缺失的文档字体注册调用方提供的字体。主要供 WASM 调用方在浏览器中获取 Web 字体后使用。

func (*Fonts) FallbackFontFamily ¶ added in v0.0.9

func (p *Fonts) FallbackFontFamily(id models.StRefID) string

FallbackFontFamily 返回为文档字体选择的外部字体族。必须先调用 LoadFont；TextLayouts 和 Text 会自动完成这一步。

func (*Fonts) HasLoadedEmbeddedFont ¶ added in v0.0.9

func (p *Fonts) HasLoadedEmbeddedFont(id models.StRefID) bool

HasLoadedEmbeddedFont 判断文档字体是否解析为可用且已加载的字体族。仅声明 FontFile 并不够，因为文件可能缺失、格式错误或被字体解析器拒绝。

func (*Fonts) LoadFont ¶

func (p *Fonts) LoadFont(id models.StRefID) (*canvas.FontFamily, error)

type GlyphLayout ¶ added in v0.0.9

type GlyphLayout struct {
	Text   string
	X      float64
	Y      float64
	Width  float64
	Height float64
	Angle  float64
}

GlyphLayout 描述一个文字字符在页面上的近似区域。坐标单位为毫米，使用页面左上角作为原点。

type TextLayout ¶ added in v0.0.9

type TextLayout struct {
	Text          string
	X             float64
	Y             float64
	Width         float64
	Height        float64
	Font          uint64
	Size          float64
	Weight        int
	ReadDirection int
	CharDirection int
	Bold          bool
	Italic        bool
	Glyphs        []GlyphLayout
}

TextLayout 描述一个 TextCode 及其字符级几何信息。

Source Files ¶

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