rasterasset

package

v0.2.0 Latest Latest Go to latest Published: Oct 7, 2026 License: MIT Imports: 7 Imported by: 0

Details

Valid go.mod file
Redistributable license
Tagged version
Stable version
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Repository

github.com/RevoTale/esp32-e-paper-manager

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Documentation ¶

Overview ¶

Package rasterasset validates manager-side image input without file/network access, HTML parsing, panel dependencies or early monochrome composition.

Index ¶

Variables
func DecodeDataURL(src string, limits Limits) (image.Image, error)
func DecodeJPEGDataURL(src string, limits Limits) (image.Image, error)
type Limits

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	ErrConfiguration = errors.New("rasterasset: invalid limits")
	ErrSource        = errors.New("rasterasset: expected canonical raster data URL")
	ErrLimit         = errors.New("rasterasset: image exceeds limit")
	ErrImage         = errors.New("rasterasset: invalid raster image")
)

Functions ¶

func DecodeDataURL ¶

func DecodeDataURL(src string, limits Limits) (image.Image, error)

DecodeDataURL accepts only data:image/png;base64, with padded RFC4648 standard base64 and no whitespace. It returns caller-owned pixels with alpha intact; the renderer must composite against the actual scene before thresholding. No URL resolver, global image decoder registry, or source metadata is exposed.

func DecodeJPEGDataURL ¶

func DecodeJPEGDataURL(src string, limits Limits) (image.Image, error)

DecodeJPEGDataURL accepts canonical JPEG data URLs with the same allocation limits as PNG. JPEG is opaque and lossy; it is not compared pixel-for-pixel with its pre-encoding source. DecodeConfig precedes pixel allocation. https://pkg.go.dev/image#hdr-Security_Considerations

Types ¶

type Limits ¶

type Limits struct {
	MaxURLBytes, MaxPNGBytes, MaxDimension, MaxPixels int
}

Limits are positive administrator-supplied per-image bounds, not HTML values. MaxURLBytes includes the prefix/base64; MaxPNGBytes bounds the decoded source file, not its pixels (the legacy field name also applies to JPEG). Callers must also enforce a document-wide asset budget.

Source Files ¶

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