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I have created a HeatMap with the size of 25000 x 70. The application crashes with the following log:

E/libEGL: call to OpenGL ES API with no current context (logged once per thread)
E/libEGL: call to OpenGL ES API with no current context (logged once per thread)
E/libEGL: call to OpenGL ES API with no current context (logged once per thread)
D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
I/OpenGLRenderer: Initialized EGL, version 1.4
W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without…
D/EGL_emulation: eglCreateContext: 0x7faef90b6500: maj 2 min 0 rcv 2
D/EGL_emulation: eglMakeCurrent: 0x7faef90b6500: ver 2 0 (tinfo 0x7faf0489eec0)
D/EGL_emulation: eglMakeCurrent: 0x7faef90b6500: ver 2 0 (tinfo 0x7faf0489eec0)
D/EGL_emulation: eglCreateContext: 0x7faf04b65680: maj 2 min 0 rcv 2
D/EGL_emulation: eglMakeCurrent: 0x7faf04b65680: ver 2 0 (tinfo 0x7faf04b7e500)
E/emuglGLESv2_enc: device/generic/goldfish-opengl/system/GLESv2_enc/GL2Encoder.cpp:s_glTexImage2D:1908 GL error 0x501 A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x41a10f90 in tid 2736 (GLThread 973)


Below is Kotlin code from my sample project that produces the error:

private const val WIDTH = 25000
private const val HEIGHT = 70

class MainActivity : AppCompatActivity()
{
    private lateinit var chartBuilder: SciChartBuilder

    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)

        SciChartSurface.setRuntimeLicenseKey(getString(R.string.sciChart_license))
        SciChartBuilder.init(this)
        chartBuilder = SciChartBuilder.instance()

        setContentView(R.layout.activity_main)
        val background = findViewById<ViewGroup>(R.id.background)

        val chartSurface = createChartSurface()
        background.addView(chartSurface)

        addPoints(chartSurface)
    }

    private fun createChartSurface(): SciChartSurface
    {
        val surface = SciChartSurface(this)

        val xAxis = chartBuilder.newNumericAxis().build()
        val yAxis = chartBuilder.newNumericAxis().build()

        surface.xAxes.add(xAxis)
        surface.yAxes.add(yAxis)

        surface.renderableSeries.add(createSeries(WIDTH, HEIGHT))

        return surface
    }

    private fun createSeries(width: Int, height: Int): FastUniformHeatmapRenderableSeries
    {
        val dataSeries = UniformHeatmapDataSeries(Int::class.javaObjectType, Int::class.javaObjectType, Float::class.javaObjectType, width, height)

        return chartBuilder.newUniformHeatmap()
            .withColorMap(ColorMap(intArrayOf(ColorUtil.DarkBlue, ColorUtil.CornflowerBlue, ColorUtil.DarkGreen, ColorUtil.Chartreuse, ColorUtil.Yellow, ColorUtil.Red), floatArrayOf(0f, 0.2f, 0.4f, 0.6f, 0.8f, 1f)))
            .withDataSeries(dataSeries)
            .build()
    }

    private fun addPoints(chartSurface: SciChartSurface)
    {
        @Suppress("UNCHECKED_CAST")
        val dataSeries = chartSurface.renderableSeries.first().dataSeries as UniformHeatmapDataSeries<Int, Int, Float>

        val xRange = 0 until WIDTH

        for (i in 0 until HEIGHT)
        {
            val values = xRange.map { (i + it).toFloat() }
            dataSeries.updateRangeZAt(0, i, values)
        }

        val renderableSeries = chartSurface.renderableSeries.first() as FastUniformHeatmapRenderableSeries
        renderableSeries.minimum = dataSeries.zValues.minimum.toDouble()
        renderableSeries.maximum = dataSeries.zValues.maximum.toDouble()
    }
}
Version
2.2.0.2348
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Hi Miha,

I’m not sure that it’s a bug, you just reached limitation of OpenGL texture size which we use to draw heatmap. FastUniformHeatmapRenderableSeries just wasn’t designed for drawing of so large heatmaps and I’m not sure if there is something we can do without rewriting entire series. Anyway I logged this issue into our bug tracker and we’ll try to improve situation in one of our next releases.

Best regards,
Yura

  • MIha Rozina
    Thank you for your answer. I guess I will now try to implement s custom renderable series as you suggested in another answer.
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