106 lines
4.0 KiB
Dart
106 lines
4.0 KiB
Dart
import 'dart:convert';
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import 'dart:typed_data';
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import 'package:image/image.dart';
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/// 纵向卡面 → 横向位图的预旋转方向（Windows Pavo 直打校准常量）。
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///
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/// 实测（2026-09-23 Windows CS-200e）：纵向缓冲 + byOrientation=1 会被 SDK 旋转 90°
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/// 且锚定错位（内容横向贴左、顺时针转卡才可读）。修复=统一预旋转成 1014×642 横向
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/// 位图 + byOrientation=2 打印。此常量定旋转方向：打测试卡若差 90°（顺/逆）就取反。
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const bool pavoPortraitRotateClockwise = true;
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/// PNG data URL 解析与像素层转换（Windows PavoApi 直打用）。
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///
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/// 卡面为 CR-80 @300dpi：横向 1014×642 / 纵向 642×1014，按源图纵横比自动选择；
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/// 透明区域铺白，避免黑底（对齐 C# 版 Hiti/CardImage.cs）。
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class CardImage {
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CardImage._(this._canvas, this.width, this.height);
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static const int landscapeWidth = 1014;
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static const int landscapeHeight = 642;
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final Image _canvas;
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final int width;
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final int height;
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/// 宽 ≥ 高 = 横向卡面
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bool get isLandscape => width >= height;
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/// 纵向卡面预旋转为横向位图（Windows Pavo 直打用，见 [pavoPortraitRotateClockwise]）。
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/// 已是横向的原样返回。返回新实例，原实例不变（正/背面各自转换）。
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CardImage toLandscape() {
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if (isLandscape) return this;
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final rotated = copyRotate(_canvas, angle: pavoPortraitRotateClockwise ? 90 : -90);
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return CardImage._(rotated, rotated.width, rotated.height);
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}
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/// 解析 data:image/png;base64,…（或其他 data URL 形式），缩放到卡面画布并铺白底。
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static CardImage fromDataUrl(String dataUrl) {
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if (dataUrl.trim().isEmpty) {
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throw ArgumentError('卡面图为空');
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}
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final comma = dataUrl.indexOf(',');
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final base64Part = comma >= 0 ? dataUrl.substring(comma + 1) : dataUrl;
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final bytes = base64.decode(base64Part.replaceAll(RegExp(r'\s'), ''));
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final raw = decodeImage(bytes);
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if (raw == null) {
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throw ArgumentError('卡面图解码失败（不支持的图片格式）');
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}
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final landscape = raw.width >= raw.height;
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final width = landscape ? landscapeWidth : landscapeHeight;
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final height = landscape ? landscapeHeight : landscapeWidth;
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final resized = copyResize(raw, width: width, height: height);
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final canvas = Image(width: width, height: height);
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// 手动 alpha 混合铺白底（与 C# 版逐像素语义一致）：
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// image 包的 compositeImage 对全透明 src 像素不是 src-over 语义，透明处会漏黑
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for (var y = 0; y < height; y++) {
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for (var x = 0; x < width; x++) {
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final p = resized.getPixel(x, y);
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final a = p.a.toInt() / 255.0;
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canvas.setPixelRgba(
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x,
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y,
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(255 * (1 - a) + p.r * a).round().clamp(0, 255),
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(255 * (1 - a) + p.g * a).round().clamp(0, 255),
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(255 * (1 - a) + p.b * a).round().clamp(0, 255),
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255,
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);
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}
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}
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return CardImage._(canvas, width, height);
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}
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/// 转 BGR 24bit 紧凑像素（无行对齐填充，PavoApi BITMAP 用）。
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Uint8List toBgr24() {
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final packed = Uint8List(width * 3 * height);
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for (var y = 0; y < height; y++) {
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var offset = y * width * 3;
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for (var x = 0; x < width; x++) {
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final p = _canvas.getPixel(x, y);
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packed[offset] = p.b.toInt() & 0xff;
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packed[offset + 1] = p.g.toInt() & 0xff;
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packed[offset + 2] = p.r.toInt() & 0xff;
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offset += 3;
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}
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}
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return packed;
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}
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/// 转 8bit 灰度（无行对齐）。树脂 K 层像素语义：0x00 = 转印黑色，
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/// 因此前端 K 层 PNG 为白底黑字，灰度值可直接使用。
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Uint8List toGray8() {
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final gray = Uint8List(width * height);
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for (var y = 0; y < height; y++) {
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var offset = y * width;
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for (var x = 0; x < width; x++) {
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final p = _canvas.getPixel(x, y);
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gray[offset + x] = (p.r.toInt() * 299 + p.g.toInt() * 587 + p.b.toInt() * 114) ~/ 1000 & 0xff;
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}
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}
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return gray;
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}
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}
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