Global Mapper SDK
Retrieves the raw band value at a given pixel location from the provided raster layer. If the layer does not contain a valid sample at the provided pixel location (i.e. it is a "no data" or transparent value), GM_Error_NoDataAtLocation will be returned. Use this to access the raw values from high-bit depth and multi-band imagery layers.
Syntax
C++
Copy
GM_DLL_EXPORTED GM_Error_t32 __stdcall GM_GetPixelBandValue
(
GM_LayerHandle_t32 aLayer, // IN: Layer to get color from
sint32 aRow, // IN: Y coord of pixel (0 is topmost)
sint32 aCol, // IN: X coord of pixel (0 is leftmost)
sint32 aBand, // IN: Band to get value for (0-based, so first band is 1)
sint32* aVal // OUT: Color of pixel at location
)