Alhan
32fb12c210
- Percentage shown between the prev/next buttons, together with the hover controls, on a translucent background. - Value is the on-screen scale relative to the image's real pixel size (100% = 1:1); updated on wheel zoom, fill/fit toggle, image change and window resize. - Pixel-size header parsing moved to lib/services/image_header.dart, shared with the settings file-properties panel. - dist: 1.7.1 .deb replaces the tracked 1.7.0 package.
81 lines
2.7 KiB
Dart
81 lines
2.7 KiB
Dart
import 'dart:io';
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import 'dart:typed_data';
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import 'package:flutter/widgets.dart' show Size;
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import 'package:image/image.dart' as img;
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/// Görüntü dosyasının gerçek piksel boyutu — tam decode yapmadan.
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///
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/// PNG/GIF/BMP/WebP: boyut ilk 33 baytta → elle parse.
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/// JPEG: SOF büyük APP/EXIF segmentlerinin ardından gelebilir → package:image startDecode.
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Size? pixelSizeOfFile(String path) {
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try {
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final file = File(path);
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final stat = file.statSync();
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const maxHead = 512 * 1024;
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final raf = file.openSync();
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final header = raf.readSync(stat.size < maxHead ? stat.size : maxHead);
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raf.closeSync();
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return _headerPixelSize(header);
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} catch (_) {}
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return null;
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}
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Size? _headerPixelSize(Uint8List b) {
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try {
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if (b.length >= 24 && b[0] == 0x89 && b[1] == 0x50) {
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// PNG
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final w = (b[16] << 24) | (b[17] << 16) | (b[18] << 8) | b[19];
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final h = (b[20] << 24) | (b[21] << 16) | (b[22] << 8) | b[23];
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return Size(w.toDouble(), h.toDouble());
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}
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if (b.length >= 10 && b[0] == 0x47 && b[1] == 0x49 && b[2] == 0x46) {
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// GIF (WBMP da GIF tabanlı olabilir)
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final w = b[6] | (b[7] << 8);
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final h = b[8] | (b[9] << 8);
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return Size(w.toDouble(), h.toDouble());
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}
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if (b.length >= 26 && b[0] == 0x42 && b[1] == 0x4D) {
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// BMP
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final w = b[18] | (b[19] << 8) | (b[20] << 16) | (b[21] << 24);
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final h = b[22] | (b[23] << 8) | (b[24] << 16) | (b[25] << 24);
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return Size(w.toDouble(), h.abs().toDouble());
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}
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if (b.length >= 30 &&
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b[0] == 0x52 &&
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b[1] == 0x49 &&
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b[2] == 0x46 &&
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b[3] == 0x46 &&
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b[8] == 0x57 &&
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b[9] == 0x45 &&
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b[10] == 0x42 &&
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b[11] == 0x50) {
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// WebP
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if (b[12] == 0x56 && b[13] == 0x50 && b[15] == 0x58) {
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// VP8X
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final w = b[24] | (b[25] << 8) | (b[26] << 16);
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final h = b[27] | (b[28] << 8) | (b[29] << 16);
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return Size((w + 1).toDouble(), (h + 1).toDouble());
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}
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if (b.length >= 25 && b[12] == 0x56 && b[13] == 0x50 && b[15] == 0x4C && b[20] == 0x2F) {
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// VP8L
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final w = (b[21] & 0x3F) | ((b[22] & 0x0F) << 6);
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final h = (b[23] & 0x3F) | ((b[24] & 0x0F) << 6);
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return Size((w + 1).toDouble(), (h + 1).toDouble());
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}
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if (b[12] == 0x56 && b[13] == 0x50 && b[15] == 0x20) {
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// VP8 (lossy)
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final w = (b[26] | (b[27] << 8)) & 0x3FFF;
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final h = (b[28] | (b[29] << 8)) & 0x3FFF;
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return Size(w.toDouble(), h.toDouble());
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}
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}
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} catch (_) {}
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try {
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// JPEG
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final info = img.JpegDecoder().startDecode(b);
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if (info != null) return Size(info.width.toDouble(), info.height.toDouble());
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} catch (_) {}
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return null;
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}
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