knb
c5c7c2ba52
- FFI gem (libptouch)、exe ptouch-print-png（PNG のみ） - ステータス 32 バイトを Hash に展開（parse_status / status_hash） - CMake: libptouch 共有ライブラリ（ptouch_shared） - RuboCop、gemspec（homepage / source_code_uri） Made-with: Cursor
107 lines
3.0 KiB
Ruby
107 lines
3.0 KiB
Ruby
# frozen_string_literal: true
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module Libptouch
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class Context
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OK = 0
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attr_reader :native
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def initialize
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@native = Binding.libptouch_create
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raise Libptouch::Error.new(0, "libptouch_create failed") if @native.null?
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end
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def last_message
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Binding.libptouch_strerror(@native)
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end
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def last_error_code
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Binding.libptouch_last_error(@native)
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end
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def raise_on_error(code)
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return if code == OK
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msg = Binding.libptouch_strerror(@native)
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raise Libptouch::Error.new(code, msg)
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end
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def open_usb
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raise_on_error(Binding.libptouch_open_usb(@native))
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self
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end
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def open_usb_vid_pid(vid, pid)
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raise_on_error(Binding.libptouch_open_usb_vid_pid(@native, vid, pid))
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self
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end
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def close
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Binding.libptouch_close(@native) if @native && !@native.null?
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self
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end
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def dispose
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close
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Binding.libptouch_destroy(@native) if @native && !@native.null?
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@native = nil
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end
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def check_raster(data, width_dots:, height_dots:, margin_mm: 0)
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params = Binding::RasterParams.new
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params[:width_dots] = width_dots
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params[:height_dots] = height_dots
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params[:margin_mm] = margin_mm
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buf = FFI::MemoryPointer.new(:uint8, data.bytesize)
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buf.put_bytes(0, data)
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raise_on_error(Binding.libptouch_check_raster(@native, buf, data.bytesize,
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params.pointer))
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self
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end
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def print_raster(data, width_dots:, height_dots:, margin_mm: 0)
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params = Binding::RasterParams.new
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params[:width_dots] = width_dots
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params[:height_dots] = height_dots
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params[:margin_mm] = margin_mm
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buf = FFI::MemoryPointer.new(:uint8, data.bytesize)
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buf.put_bytes(0, data)
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raise_on_error(Binding.libptouch_print_raster(@native, buf, data.bytesize,
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params.pointer))
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self
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end
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def png_file_to_raster(path, threshold: nil)
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opt_ptr = nil
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unless threshold.nil?
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o = Binding::PngOptions.new
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o[:threshold] = threshold
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opt_ptr = o.pointer
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end
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out_pp = FFI::MemoryPointer.new(:pointer)
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out_len = FFI::MemoryPointer.new(:size_t)
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out_params = Binding::RasterParams.new
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raise_on_error(Binding.libptouch_png_file_to_raster(
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@native, path, opt_ptr, out_pp, out_len, out_params.pointer
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))
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raw = out_pp.read_pointer
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raise Libptouch::Error.new(OK, "null raster from PNG") if raw.null?
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len = out_len.read_size_t
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bytes = raw.read_bytes(len)
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Binding.libptouch_free_raster(raw)
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[bytes, out_params[:width_dots], out_params[:height_dots]]
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end
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def status_bytes
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buf = FFI::MemoryPointer.new(:uint8, STATUS_LENGTH)
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raise_on_error(Binding.libptouch_get_status(@native, buf))
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buf.read_bytes(STATUS_LENGTH)
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end
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def status_hash
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Libptouch.parse_status(status_bytes)
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end
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end
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end
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