update

2026-05-14 13:30:06 +08:00
parent 974946cee4
commit e43171521d
91 changed files with 10485 additions and 3254 deletions
@@ -0,0 +1,99 @@
+#include "image/ImageFileLoader.h"
+
+#include "image/ImageDecodeConfig.h"
+#include "large_image/VipsBackend.h"
+
+#include <QImageReader>
+
+namespace core {
+namespace image_file {
+
+bool probeImagePixelSize(const QString& absolutePath, QSize* outSize) {
+    if (!outSize || absolutePath.isEmpty()) {
+        return false;
+    }
+    if (VipsBackend::isAvailable() && VipsBackend::probeSize(absolutePath, outSize)) {
+        return outSize->isValid() && outSize->width() > 0 && outSize->height() > 0;
+    }
+    core::image_decode::prepareLargeImageReader();
+    QImageReader reader(absolutePath);
+    reader.setAutoTransform(true);
+    *outSize = reader.size();
+    return outSize->isValid() && outSize->width() > 0 && outSize->height() > 0;
+}
+
+QImage loadImageLimited(const QString& absolutePath, qint64 maxPixelBudget) {
+    if (absolutePath.isEmpty()) {
+        return {};
+    }
+    QImage viaVips;
+    if (VipsBackend::isAvailable() &&
+        VipsBackend::loadThumbnailQImage(absolutePath, maxPixelBudget, &viaVips) && !viaVips.isNull()) {
+        return viaVips;
+    }
+    core::image_decode::prepareLargeImageReader();
+    QImageReader reader(absolutePath);
+    reader.setAutoTransform(true);
+    core::image_decode::downscaleReaderIfExceeds(reader, maxPixelBudget);
+    return reader.read();
+}
+
+bool loadRegionToQImage(const QString& absolutePath, const QRect& rectLogical, int maxOutputWidth, int maxOutputHeight,
+                        QImage* out) {
+    if (!out || absolutePath.isEmpty() || maxOutputWidth < 32 || maxOutputHeight < 32) {
+        return false;
+    }
+    out->detach();
+    *out = QImage();
+    if (VipsBackend::isAvailable() &&
+        VipsBackend::loadRegionToQImage(absolutePath, rectLogical, maxOutputWidth, maxOutputHeight, out) &&
+        !out->isNull()) {
+        return true;
+    }
+    QSize logical;
+    if (!probeImagePixelSize(absolutePath, &logical)) {
+        return false;
+    }
+    const QRect r = rectLogical.intersected(QRect(0, 0, logical.width(), logical.height()));
+    if (r.isEmpty()) {
+        return false;
+    }
+    QImage full = loadImageLimited(absolutePath, core::image_decode::kWorkspaceMaxPixels);
+    if (full.isNull()) {
+        return false;
+    }
+    const QRect r2 = core::image_decode::mapRectBetweenSizes(r, logical, full.size());
+    QImage piece = full.copy(r2);
+    if (piece.isNull()) {
+        return false;
+    }
+    // 与 vips 路径保持一致：输出永不超过 maxOutput*，避免后续绘制阶段二次缩放导致明显“发糊”。
+    if (piece.width() > maxOutputWidth || piece.height() > maxOutputHeight) {
+        piece = piece.scaled(QSize(maxOutputWidth, maxOutputHeight), Qt::KeepAspectRatio, Qt::SmoothTransformation);
+    }
+    *out = piece;
+    return !out->isNull();
+}
+
+bool loadRegionToQImageExact(const QString& absolutePath, const QRect& rectLogical, QImage* out) {
+    if (!out || absolutePath.isEmpty()) {
+        return false;
+    }
+    out->detach();
+    *out = QImage();
+    QSize logical;
+    if (!probeImagePixelSize(absolutePath, &logical)) {
+        return false;
+    }
+    const QRect r = rectLogical.intersected(QRect(0, 0, logical.width(), logical.height()));
+    if (r.isEmpty()) {
+        return false;
+    }
+    // 1:1 输出：maxOutput 设为 region 本身大小，避免 vips/Qt 管线自动缩放导致坐标不一致。
+    const int w = std::max(1, r.width());
+    const int h = std::max(1, r.height());
+    return loadRegionToQImage(absolutePath, r, w, h, out);
+}
+
+}  // namespace image_file
+}  // namespace core