1、为图层添加渲染器和读取器，分离图层基础信息、渲染和读写；

2、LayerTreeLayerNode持有MapLayer图层引用，为右键菜单做准备； 3、改名：imageviewer → mapcavas，mapcavas持有MapLayer图层引用，为刷新图像做准备；
2026-02-25 15:08:06 +08:00
parent e3b2d136d3
commit bdf956ed99
13 changed files with 659 additions and 286 deletions
--- a/HPPA/RasterDataProvider.cpp
+++ b/HPPA/RasterDataProvider.cpp
@ -0,0 +1,123 @@
+#include "RasterDataProvider.h"
+#include <QString>
+#include <QDebug>
+
+#if HPPA_HAVE_GDAL
+#include <gdal_priv.h>
+#include <cpl_conv.h>
+#endif
+
+RasterDataProvider::RasterDataProvider(const QString& uri)
+    : m_uri(uri), m_dataset(nullptr)
+{
+}
+
+RasterDataProvider::~RasterDataProvider()
+{
+    close();
+}
+
+bool RasterDataProvider::open()
+{
+#if HPPA_HAVE_GDAL
+    GDALAllRegister();
+    m_dataset = (GDALDataset*)GDALOpen((const char*)m_uri.toLocal8Bit().constData(), GA_ReadOnly);
+    if (!m_dataset) {
+        qWarning() << "RasterDataProvider: failed to open dataset:" << m_uri;
+        return false;
+    }
+    return true;
+#else
+    Q_UNUSED(m_uri);
+    qWarning() << "RasterDataProvider: GDAL not available, open will fail.";
+    return false;
+#endif
+}
+
+void RasterDataProvider::close()
+{
+#if HPPA_HAVE_GDAL
+    if (m_dataset) {
+        GDALClose((GDALDatasetH)m_dataset);
+        m_dataset = nullptr;
+    }
+#else
+    m_dataset = nullptr;
+#endif
+}
+
+int RasterDataProvider::bandCount() const
+{
+#if HPPA_HAVE_GDAL
+    if (!m_dataset) return 0;
+    return m_dataset->GetRasterCount();
+#else
+    Q_UNUSED(this);
+    return 0;
+#endif
+}
+
+int RasterDataProvider::width() const
+{
+#if HPPA_HAVE_GDAL
+    if (!m_dataset) return 0;
+    return m_dataset->GetRasterXSize();
+#else
+    Q_UNUSED(this);
+    return 0;
+#endif
+}
+
+int RasterDataProvider::height() const
+{
+#if HPPA_HAVE_GDAL
+    if (!m_dataset) return 0;
+    return m_dataset->GetRasterYSize();
+#else
+    Q_UNUSED(this);
+    return 0;
+#endif
+}
+
+std::vector<double> RasterDataProvider::bandWavelengths() const
+{
+    std::vector<double> res;
+#if HPPA_HAVE_GDAL
+    if (!m_dataset) return res;
+    for (int i = 1; i <= m_dataset->GetRasterCount(); ++i) {
+        GDALRasterBand* band = m_dataset->GetRasterBand(i);
+        if (!band) continue;
+        // Attempt to read wavelength from metadata (commonly "Wavelength" or "wavelength")
+        const char* val = band->GetMetadataItem("Wavelength");
+        if (!val) val = band->GetMetadataItem("wavelength");
+        if (val) {
+            double v = atof(val);
+            res.push_back(v);
+        } else {
+            // push a negative to indicate unknown
+            res.push_back(-1.0);
+        }
+    }
+#endif
+    return res;
+}
+
+bool RasterDataProvider::readBandAsFloat(int bandIndex, std::vector<float>& outBuffer) const
+{
+#if HPPA_HAVE_GDAL
+    if (!m_dataset) return false;
+    int bands = m_dataset->GetRasterCount();
+    if (bandIndex < 0 || bandIndex >= bands) return false;
+    GDALRasterBand* band = m_dataset->GetRasterBand(bandIndex + 1);
+    if (!band) return false;
+    int w = m_dataset->GetRasterXSize();
+    int h = m_dataset->GetRasterYSize();
+    outBuffer.assign(w * h, 0.0f);
+    CPLErr err = band->RasterIO(GF_Read, 0, 0, w, h, outBuffer.data(), w, h, GDT_Float32, 0, 0);
+    return err == CE_None;
+#else
+    Q_UNUSED(bandIndex);
+    Q_UNUSED(outBuffer);
+    return false;
+#endif
+}