Mikkel Georgsen
1156eff896
- PrinterDriver interface: Connect/Print(bitmap,w,h)/Disconnect - ImageToRawBitmap(): 1-bit packed row-major converter from image.Image - MockDriver: saves PNG to SaveDir (/tmp default) for visual inspection - PrtQutieDriver: stub returns ErrNoDevice — safe before hardware arrives - ErrNoDevice, ErrNotConnected, ErrEmptyBitmap sentinel errors
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
package printer
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import (
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"fmt"
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"image"
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"image/color"
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"image/png"
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"os"
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"time"
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)
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// MockDriver implements PrinterDriver for testing and development.
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// Print() saves a PNG to SaveDir (default /tmp) and logs to stdout.
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// No hardware required — use this as the default driver until PRT Qutie arrives.
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type MockDriver struct {
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connected bool
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// SaveDir is the directory where label PNGs are written.
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// Defaults to /tmp. Override in tests to use t.TempDir().
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SaveDir string
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}
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// NewMockDriver creates a MockDriver that saves PNGs to /tmp.
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func NewMockDriver() *MockDriver {
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return &MockDriver{SaveDir: "/tmp"}
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}
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// Connect marks the driver as connected.
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func (m *MockDriver) Connect() error {
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m.connected = true
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return nil
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}
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// Disconnect marks the driver as disconnected.
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func (m *MockDriver) Disconnect() error {
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m.connected = false
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return nil
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}
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// Print reconstructs the label image from the 1-bit bitmap and saves it as a PNG.
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// Returns ErrEmptyBitmap if bitmap is nil or empty.
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func (m *MockDriver) Print(bitmap []byte, width, height int) error {
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if len(bitmap) == 0 {
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return ErrEmptyBitmap
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}
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// Reconstruct image from 1-bit packed bitmap for visual inspection.
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img := image.NewGray(image.Rect(0, 0, width, height))
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rowBytes := (width + 7) / 8
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for y := 0; y < height; y++ {
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for x := 0; x < width; x++ {
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byteIdx := y*rowBytes + x/8
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bit := (bitmap[byteIdx] >> (7 - uint(x%8))) & 1
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if bit == 1 {
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img.SetGray(x, y, color.Gray{Y: 0})
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} else {
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img.SetGray(x, y, color.Gray{Y: 255})
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}
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}
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}
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path := fmt.Sprintf("%s/hwlab-label-%d.png", m.SaveDir, time.Now().UnixMilli())
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f, err := os.Create(path)
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if err != nil {
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return fmt.Errorf("printer: mock create file: %w", err)
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}
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defer f.Close()
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if err := png.Encode(f, img); err != nil {
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return fmt.Errorf("printer: mock encode PNG: %w", err)
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}
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fmt.Printf("[MockDriver] label saved → %s (%dx%d)\n", path, width, height)
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return nil
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}
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