diff options
Diffstat (limited to 'ql')
| -rw-r--r-- | ql/ql.go | 91 | ||||
| -rw-r--r-- | ql/ql_linux.go | 4 |
2 files changed, 76 insertions, 19 deletions
@@ -120,9 +120,67 @@ const ( printPins = printBytes * 8 ) +// pack packs a bool array into a byte array for the printer to print out. +func pack(data [printPins]bool, out *[]byte) { + for i := 0; i < printBytes; i++ { + var b byte + for j := 0; j < 8; j++ { + b <<= 1 + if data[i*8+j] { + b |= 1 + } + } + *out = append(*out, b) + } +} + +// makeBitmapDataRB converts an image to the printer's red-black raster format. +func makeBitmapDataRB(src image.Image, margin, length int) []byte { + data, bounds := []byte{}, src.Bounds() + if bounds.Dy() > length { + bounds.Max.Y = bounds.Min.Y + length + } + if bounds.Dx() > printPins-margin { + bounds.Max.X = bounds.Min.X + printPins + } + + redcells, blackcells := [printPins]bool{}, [printPins]bool{} + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + length-- + + // The graphics needs to be inverted horizontally, iterating backwards. + offset := margin + for x := bounds.Max.X - 1; x >= bounds.Min.X; x-- { + r, g, b, a := src.At(x, y).RGBA() + redcells[offset] = r >= 0xc000 && g < 0x4000 && b < 0x4000 && + a >= 0x8000 + blackcells[offset] = r < 0x4000 && g < 0x4000 && b < 0x4000 && + a >= 0x8000 + offset++ + } + + data = append(data, 'w', 0x01, printBytes) + pack(blackcells, &data) + data = append(data, 'w', 0x02, printBytes) + pack(redcells, &data) + } + for ; length > 0; length-- { + data = append(data, 'w', 0x01, printBytes) + data = append(data, make([]byte, printBytes)...) + data = append(data, 'w', 0x02, printBytes) + data = append(data, make([]byte, printBytes)...) + } + return data +} + // makeBitmapData converts an image to the printer's raster format. -func makeBitmapData(src image.Image, margin, length int) (data []byte) { - bounds := src.Bounds() +func makeBitmapData(src image.Image, rb bool, margin, length int) []byte { + // It's a necessary nuisance, so just copy and paste. + if rb { + return makeBitmapDataRB(src, margin, length) + } + + data, bounds := []byte{}, src.Bounds() if bounds.Dy() > length { bounds.Max.Y = bounds.Min.Y + length } @@ -138,30 +196,24 @@ func makeBitmapData(src image.Image, margin, length int) (data []byte) { offset := margin for x := bounds.Max.X - 1; x >= bounds.Min.X; x-- { r, g, b, a := src.At(x, y).RGBA() - pixels[offset] = r == 0 && g == 0 && b == 0 && a >= 0x8000 + pixels[offset] = r < 0x4000 && g < 0x4000 && b < 0x4000 && + a >= 0x8000 offset++ } data = append(data, 'g', 0x00, printBytes) - for i := 0; i < printBytes; i++ { - var b byte - for j := 0; j < 8; j++ { - b <<= 1 - if pixels[i*8+j] { - b |= 1 - } - } - data = append(data, b) - } + pack(pixels, &data) } for ; length > 0; length-- { data = append(data, 'g', 0x00, printBytes) data = append(data, make([]byte, printBytes)...) } - return + return data } -func makePrintData(status *Status, image image.Image) (data []byte) { +// XXX: It would be preferrable to know for certain if this is a red-black tape, +// because the printer refuses to print on a mismatch. +func makePrintData(status *Status, image image.Image, rb bool) (data []byte) { mediaInfo := GetMediaInfo( status.MediaWidthMM(), status.MediaLengthMM(), @@ -198,7 +250,11 @@ func makePrintData(status *Status, image image.Image) (data []byte) { // Cut at end (though it's the default). // Not sure what it means, doesn't seem to have any effect to turn it off. - data = append(data, 0x1b, 0x69, 0x4b, 0x08) + if rb { + data = append(data, 0x1b, 0x69, 0x4b, 0x08|0x01) + } else { + data = append(data, 0x1b, 0x69, 0x4b, 0x08) + } if status.MediaLengthMM() != 0 { // 3mm margins along the direction of feed. 0x23 = 35 dots, the minimum. @@ -213,7 +269,8 @@ func makePrintData(status *Status, image image.Image) (data []byte) { data = append(data, 0x4d, 0x00) // The graphics data itself. - data = append(data, makeBitmapData(image, mediaInfo.SideMarginPins, dy)...) + bitmapData := makeBitmapData(image, rb, mediaInfo.SideMarginPins, dy) + data = append(data, bitmapData...) // Print command with feeding. return append(data, 0x1a) diff --git a/ql/ql_linux.go b/ql/ql_linux.go index 9d465b5..26675eb 100644 --- a/ql/ql_linux.go +++ b/ql/ql_linux.go @@ -172,8 +172,8 @@ var errErrorOccurred = errors.New("error occurred") var errUnexpectedStatus = errors.New("unexpected status") var errUnknownMedia = errors.New("unknown media") -func (p *Printer) Print(image image.Image) error { - data := makePrintData(p.LastStatus, image) +func (p *Printer) Print(image image.Image, rb bool) error { + data := makePrintData(p.LastStatus, image, rb) if data == nil { return errUnknownMedia } |