initial commit

client/core/depth/DepthService.cpp

@@ -0,0 +1,58 @@
+#include "depth/DepthService.h"
+
+#include <algorithm>
+
+namespace core {
+
+QImage DepthService::computeFakeDepth(const QSize& size) {
+    if (size.isEmpty() || size.width() <= 0 || size.height() <= 0) {
+        return {};
+    }
+    QImage depth(size, QImage::Format_Grayscale8);
+    if (depth.isNull()) {
+        return {};
+    }
+    depth.fill(0);
+    return depth;
+}
+
+QImage DepthService::computeFakeDepthFromBackground(const QImage& background) {
+    if (background.isNull()) {
+        return {};
+    }
+    return computeFakeDepth(background.size());
+}
+
+QImage DepthService::depthToColormapOverlay(const QImage& depth8, int alpha) {
+    if (depth8.isNull()) {
+        return {};
+    }
+    const QImage src = (depth8.format() == QImage::Format_Grayscale8) ? depth8 : depth8.convertToFormat(QImage::Format_Grayscale8);
+    if (src.isNull()) {
+        return {};
+    }
+
+    const int a = std::clamp(alpha, 0, 255);
+    QImage out(src.size(), QImage::Format_ARGB32_Premultiplied);
+    if (out.isNull()) {
+        return {};
+    }
+
+    for (int y = 0; y < src.height(); ++y) {
+        const uchar* row = src.constScanLine(y);
+        QRgb* dst = reinterpret_cast<QRgb*>(out.scanLine(y));
+        for (int x = 0; x < src.width(); ++x) {
+            const int d = static_cast<int>(row[x]); // 0..255
+            // depth=0（远）-> 蓝；depth=255（近）-> 红
+            const int r = d;
+            const int g = 0;
+            const int b = 255 - d;
+            dst[x] = qRgba(r, g, b, a);
+        }
+    }
+
+    return out;
+}
+
+}  // namespace core
+