fix

1、基于新框架实现点击显示光谱;
2、影像拉伸显示优化；
3、右键菜单新增：移除所有栅格图层；

HPPA/RasterLayer.h

@@ -3,6 +3,7 @@
 #include "MapLayer.h"
 #include <memory>
 #include <QImage>
+#include <QVector>
 
 class RasterDataProvider;
 class RasterRenderer;
@@ -23,12 +24,15 @@ public:
     // Create or open provider based on this layer's uri
     bool openDataProvider();
 
+    bool isValidPixel(int x, int y);
+    bool readPixelSpectrum(int x, int y, QVector<double>& wavelengths, QVector<double>& spectrum);
+
     struct RenderParams {
         double rWave = 665.0; // default wavelengths (nm)
         double gWave = 560.0;
         double bWave = 490.0;
         double minValue = 0.0; // optional stretch
-        double maxValue = 255.0;
+        double maxValue = 4095.0;
     };
 
     // Render the raster using current provider and renderer. Returns an empty QImage on failure.