PdfiumFPDF_RenderPageBitmap_Start Method

public static ProgressiveStatus FPDF_RenderPageBitmap_Start(
	IntPtr bitmap,
	IntPtr page,
	int start_x,
	int start_y,
	int size_x,
	int size_y,
	PageRotate rotate,
	RenderFlags flag,
	IFSDK_PAUSE pause
)

Public Shared Function FPDF_RenderPageBitmap_Start ( 
	bitmap As IntPtr,
	page As IntPtr,
	start_x As Integer,
	start_y As Integer,
	size_x As Integer,
	size_y As Integer,
	rotate As PageRotate,
	flag As RenderFlags,
	pause As IFSDK_PAUSE
) As ProgressiveStatus

public:
static ProgressiveStatus FPDF_RenderPageBitmap_Start(
	IntPtr bitmap, 
	IntPtr page, 
	int start_x, 
	int start_y, 
	int size_x, 
	int size_y, 
	PageRotate rotate, 
	RenderFlags flag, 
	IFSDK_PAUSE^ pause
)

static member FPDF_RenderPageBitmap_Start : 
        bitmap : IntPtr * 
        page : IntPtr * 
        start_x : int * 
        start_y : int * 
        size_x : int * 
        size_y : int * 
        rotate : PageRotate * 
        flag : RenderFlags * 
        pause : IFSDK_PAUSE -> ProgressiveStatus 

public static ProgressiveStatus FPDF_RenderPageBitmap_Start(
	IntPtr bitmap,
	IntPtr page,
	int start_x,
	int start_y,
	int size_x,
	int size_y,
	PageRotate rotate,
	RenderFlags flag,
	IFSDK_PAUSE pause
)

Patagames.Pdf.Pdfium.FPDF_RenderPageBitmap_Start = function(bitmap, page, start_x, start_y, size_x, size_y, rotate, flag, pause);

public void ProgressiveRenderPage()
{
    IntPtr doc = Pdfium.FPDF_LoadDocument(@"Files\test001.pdf");
    IntPtr page = Pdfium.FPDF_LoadPage(doc, 0);

    double width, height;
    Pdfium.FPDF_GetPageSizeByIndex(doc, 0, out width, out height);
    IntPtr bitmap = Pdfium.FPDFBitmap_Create((int)width, (int)height, true);

    bool needPause = true;

    IFSDK_PAUSE pause = new IFSDK_PAUSE();
    pause.needToPauseNowCallback = (pthis) =>
    {
        return needPause;
    };

    var ret = Pdfium.FPDF_RenderPageBitmap_Start(bitmap, page, 0, 0, (int)width, (int)height, PageRotate.Normal, RenderFlags.None, pause);
    if (ret == ProgressiveRenderingStatuses.RenderFailed)
        throw new Exception();
    else if (ret == ProgressiveRenderingStatuses.RenderTobeContinued)
    {
        needPause = false;
        ret = Pdfium.FPDF_RenderPage_Continue(page, pause);
    }

    if (ret == ProgressiveRenderingStatuses.RenderDone)
        Pdfium.FPDF_RenderPage_Close(page);
    else
        throw new Exception();

    IntPtr buffer = Pdfium.FPDFBitmap_GetBuffer(bitmap);
    int stride = Pdfium.FPDFBitmap_GetStride(bitmap);
    using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap((int)width, (int)height, stride, System.Drawing.Imaging.PixelFormat.Format32bppArgb, buffer))
    {
        bmp.Save("FPDF_RenderPage_Continue.png", System.Drawing.Imaging.ImageFormat.Png);
    }

    Pdfium.FPDFBitmap_Destroy(bitmap);
    Pdfium.FPDF_ClosePage(page);
    Pdfium.FPDF_CloseDocument(doc);
}