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Convert PDF to image (JPG, PNG, BMP, TIFF) in Swift

Sample Swift code to use PDFTron SDK's built-in rasterizer to render PDF images on the fly and save the resulting images in various raster image formats (such as PNG, JPEG, BMP, TIFF). Learn more about our PDF Conversion Library.

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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

import PDFNet
import Foundation

//---------------------------------------------------------------------------------------
// The following sample illustrates how to convert PDF documents to various raster image
// formats (such as PNG, JPEG, BMP, TIFF, etc), as well as how to convert a PDF page to
// GDI+ Bitmap for further manipulation and/or display in WinForms applications.
//---------------------------------------------------------------------------------------
func runPDFDrawTest() -> Int {
    return autoreleasepool {
        var ret = 0

        do {
            try PTPDFNet.catchException {
                // The first step in every application using PDFNet is to initialize the
                // library and set the path to common PDF resources. The library is usually
                // initialized only once, but calling Initialize() multiple times is also fine.
                
                
                // Optional: Set ICC color profiles to fine tune color conversion
                // for PDF 'device' color spaces...
                
                // PDFNet::SetResourcesPath("../../../resources");
                // PDFNet::SetColorManagement();
                // PDFNet::SetDefaultDeviceCMYKProfile("D:/Misc/ICC/USWebCoatedSWOP.icc");
                // PDFNet::SetDefaultDeviceRGBProfile("AdobeRGB1998.icc"); // will search in PDFNet resource folder.
                
                // ----------------------------------------------------
                // Optional: Set predefined font mappings to override default font
                // substitution for documents with missing fonts...
                
                // PDFNet::AddFontSubst("StoneSans-Semibold", "C:/WINDOWS/Fonts/comic.ttf");
                // PDFNet::AddFontSubst("StoneSans", "comic.ttf");  // search for 'comic.ttf' in PDFNet resource folder.
                // PDFNet::AddFontSubst(PDFNet::e_Identity, "C:/WINDOWS/Fonts/arialuni.ttf");
                // PDFNet::AddFontSubst(PDFNet::e_Japan1, "C:/Program Files/Adobe/Acrobat 7.0/Resource/CIDFont/KozMinProVI-Regular.otf");
                // PDFNet::AddFontSubst(PDFNet::e_Japan2, "c:/myfonts/KozMinProVI-Regular.otf");
                // PDFNet::AddFontSubst(PDFNet::e_Korea1, "AdobeMyungjoStd-Medium.otf");
                // PDFNet::AddFontSubst(PDFNet::e_CNS1, "AdobeSongStd-Light.otf");
                // PDFNet::AddFontSubst(PDFNet::e_GB1, "AdobeMingStd-Light.otf");
                
                let draw: PTPDFDraw = PTPDFDraw(dpi: 92)   // PDFDraw class is used to rasterize PDF pages.
                
                //--------------------------------------------------------------------------------
                // Example 1) Convert the first page to PNG and TIFF at 92 DPI.
                // A three step tutorial to convert PDF page to an image.
                do {
                    try PTPDFNet.catchException {
                        // A) Open the PDF document.
                        let doc: PTPDFDoc = PTPDFDoc(filepath: Bundle.main.path(forResource: "tiger", ofType: "pdf"))
                        
                        // Initialize the security handler, in case the PDF is encrypted.
                        doc.initSecurityHandler()
                        
                        // B) The output resolution is set to 92 DPI.
                        draw.setDPI(92)
                        
                        // C) Rasterize the first page in the document and save the result as PNG.
                        draw.export(doc.getPageIterator(1).current(), filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_92dpi.png").path, format: "PNG")
                        
                        print("Example 1: ../../TestFiles/Output/tiger_92dpi.png. Done.")
                        
                        // Export the same page as TIFF
                        draw.export(doc.getPageIterator(1).current(), filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_92dpi.tif").path, format: "TIFF")
                    }
                } catch let e as NSError {
                    print("\(e)")
                    ret = 1
                }

                //--------------------------------------------------------------------------------
                // Example 2) Convert the all pages in a given document to JPEG at 72 DPI.
                print("Example 2:")
                let hint_set: PTObjSet = PTObjSet()   //  A collection of rendering 'hits'.
                do {
                    try PTPDFNet.catchException {
                        let doc: PTPDFDoc = PTPDFDoc(filepath: Bundle.main.path(forResource: "newsletter", ofType: "pdf"))
                        // Initialize the security handler, in case the PDF is encrypted.
                        doc.initSecurityHandler()
                        
                        draw.setDPI(72)   // Set the output resolution is to 72 DPI.

                        // Use optional encoder parameter to specify JPEG quality.
                        let encoder_param: PTObj = hint_set.createDict()
                        encoder_param.putNumber("Quality", value: 80)
                        
                        // Traverse all pages in the document.
                        let itr: PTPageIterator = doc.getPageIterator(1)
                        while itr.hasNext() {
                            let filename: String = URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("").path + ("newsletter\(itr.current().getIndex()).jpg")
                            print("\(filename)")
                        
                            //draw.export(withObj: itr.current(), filename: filename, format: "JPEG", encoder_params: encoder_param)
                            itr.next()
                        }

                        print("Done.")
                    }
                } catch let e as NSError {
                    print("\(e)")
                    ret = 1
                }

                // Examples 3-5
                do {
                    try PTPDFNet.catchException {
                        // Common code for remaining samples.
                        let tiger_doc: PTPDFDoc = PTPDFDoc(filepath: Bundle.main.path(forResource: "tiger", ofType: "pdf"))
                        // Initialize the security handler, in case the PDF is encrypted.
                        tiger_doc.initSecurityHandler()
                        let page: PTPage = tiger_doc.getPage(1)
                        
                        //--------------------------------------------------------------------------------
                        // Example 3) Convert the first page to raw bitmap. Also, rotate the
                        // page 90 degrees and save the result as RAW.
                        draw.setDPI(100)  // Set the output resolution is to 100 DPI.
                        draw.setRotate(e_pt90)    // Rotate all pages 90 degrees clockwise.
                        
                        let buf: PTBitmapInfo = draw.getBitmap(page, pix_fmt: e_ptrgb, demult: false)
                        
                        // Save the raw RGB data to disk.
                        do {
                            try buf.getBuffer().write(to: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_100dpi_rot90.raw"), options: [])
                        } catch {
                            
                        }
                        
                        print("Example 3: ../../TestFiles/Output/tiger_100dpi_rot90.raw. Done.")
                        draw.setRotate(e_pt0) // Disable image rotation for remaining samples.

                        //--------------------------------------------------------------------------------
                        // Example 4) Convert PDF page to a fixed image size. Also illustrates some
                        // other features in PDFDraw class such as rotation, image stretching, exporting
                        // to grayscale, or monochrome.
                        
                        // Initialize render 'gray_hint' parameter, that is used to control the
                        // rendering process. In this case we tell the rasterizer to export the image as
                        // 1 Bit Per Component (BPC) image.
                        let mono_hint: PTObj = hint_set.createDict()
                        mono_hint.putNumber("BPC", value: 1)
                        
                        // SetImageSize can be used instead of SetDPI() to adjust page  scaling
                        // dynamically so that given image fits into a buffer of given dimensions.
                        draw.setImageSize(1000, height: 1000, preserve_aspect_ratio: true)  // Set the output image to be 1000 wide and 1000 pixels tall
                        draw.export(withObj: page, filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_1000x1000.png").path, format: "PNG", encoder_params: mono_hint)
                        print("Example 4: ../../TestFiles/Output/tiger_1000x1000.png. Done.")
                        
                        draw.setImageSize(200, height: 400, preserve_aspect_ratio: true)    // Set the output image to be 200 wide and 300 pixels tall
                        draw.setRotate(e_pt180)   // Rotate all pages 90 degrees clockwise.

                        // 'gray_hint' tells the rasterizer to export the image as grayscale.
                        let gray_hint: PTObj = hint_set.createDict()
                        gray_hint.putName("ColorSpace", name: "Gray")
                        
                        draw.export(withObj: page, filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_200x400_rot180.png").path, format: "PNG", encoder_params: gray_hint)
                        print("Example 4: ../../TestFiles/Output/tiger_200x400_rot180.png. Done.")
                        
                        draw.setImageSize(400, height: 200, preserve_aspect_ratio: false)   // The third parameter sets 'preserve-aspect-ratio' to false.
                        draw.setRotate(e_pt0) // Disable image rotation.
                        draw.export(page, filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_400x200_stretch.jpg").path, format: "JPEG")
                        print("Example 4: ../../TestFiles/Output/tiger_400x200_stretch.jpg. Done.")
                        
                        //--------------------------------------------------------------------------------
                        // Example 5) Zoom into a specific region of the page and rasterize the
                        // area at 200 DPI and as a thumbnail (i.e. a 50x50 pixel image).
                        let zoom_rect = PTPDFRect(x1: 216, y1: 522, x2: 330, y2: 600)
                        page.setCropBox(zoom_rect)    // Set the page crop box.

                        // Select the crop region to be used for drawing.
                        draw.setPageBox(e_ptcrop)
                        draw.setDPI(900)  // Set the output image resolution to 900 DPI.
                        draw.export(page, filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_zoom_900dpi.png").path, format: "PNG")
                        print("Example 5: ../../TestFiles/Output/tiger_zoom_900dpi.png. Done.")
                        
                        draw.setImageSize(50, height: 50, preserve_aspect_ratio: true)
                        // Set the thumbnail to be 50x50 pixel image.
                        draw.export(page, filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("tiger_zoom_50x50.png").path, format: "PNG")
                        print("Example 5: ../../TestFiles/Output/tiger_zoom_50x50.png. Done.")
                    }
                } catch let e as NSError {
                    print("\(e)")
                    ret = 1
                }
                
                let cmyk_hint: PTObj = hint_set.createDict()
                cmyk_hint.putName("ColorSpace", name: "CMYK")
                
                //--------------------------------------------------------------------------------
                // Example 7) Convert the first PDF page to CMYK TIFF at 92 DPI.
                // A three step tutorial to convert PDF page to an image
                print("Example 7:")
                do {
                    try PTPDFNet.catchException {
                        // A) Open the PDF document.
                        let doc: PTPDFDoc = PTPDFDoc(filepath: Bundle.main.path(forResource: "tiger", ofType: "pdf"))
                        // Initialize the security handler, in case the PDF is encrypted.
                        doc.initSecurityHandler()
                        
                        // B) The output resolution is set to 92 DPI.
                        draw.setDPI(92)
                        
                        // C) Rasterize the first page in the document and save the result as TIFF.
                        let pg: PTPage = doc.getPage(1)
                        draw.export(withObj: pg, filename: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("out1.tif").path, format: "TIFF", encoder_params: cmyk_hint)
                        print("Example 7: Result saved in ../../TestFiles/Output/out1.tif")
                    }
                } catch let e as NSError {
                    print("\(e)")
                    ret = 1
                }
                
                //--------------------------------------------------------------------------------
                // Example 8) PDFRasterizer can be used for more complex rendering tasks, such as
                // strip by strip or tiled document rendering. In particular, it is useful for
                // cases where you cannot simply modify the page crop box (interactive viewing,
                // parallel rendering).  This example shows how you can rasterize the south-west
                // quadrant of a page.
                print("Example 8:")
                do {
                    try PTPDFNet.catchException {
                        // A) Open the PDF document.
                        let doc: PTPDFDoc = PTPDFDoc(filepath: Bundle.main.path(forResource: "tiger", ofType: "pdf"))
                        // Initialize the security handler, in case the PDF is encrypted.
                        doc.initSecurityHandler()
                        
                        // B) Get the page matrix
                        let pg: PTPage = doc.getPage(1)
                        let box: PTBox = e_ptcrop
                        var mtx: PTMatrix2D = pg.getDefaultMatrix(true, box_type: box, angle: e_pt0)
                        // We want to render a quadrant, so use half of width and height
                        let pg_w: Double = pg.getWidth(box) / 2
                        let pg_h: Double = pg.getHeight(box) / 2
                        
                        // C) Scale matrix from PDF space to buffer space
                        let dpi: Double = 96.0
                        let scale: Double = dpi / 72.0  // PDF space is 72 dpi
                        let buf_w = floor(scale * pg_w)
                        let buf_h = floor(scale * pg_h)
                        let bytes_per_pixel: Double = 4    // RGBA buffer
                        _ = (buf_w * buf_h * bytes_per_pixel)
                        mtx.translate(0, v: -pg_h)
                        // translate by '-pg_h' since we want south-west quadrant
                        //mtx = Common::Matrix2D(scale, 0, 0, scale, 0, 0) * mtx;
                        let scale_mtx: PTMatrix2D = PTMatrix2D(a: scale, b: 0, c: 0, d: scale, h: 0, v: 0)
                        mtx = scale_mtx.multiply(mtx)
                        
                        // D) Rasterize page into memory buffer, according to our parameters
                        let rast: PTPDFRasterizer = PTPDFRasterizer(type: e_ptBuiltIn)
                        var _: Data = rast.rasterize(pg, width: Int32(buf_w), height: Int32(buf_h), stride: Int32(buf_w * bytes_per_pixel), num_comps: Int32(bytes_per_pixel), demult: true, device_mtx: mtx, clip: nil, scrl_clip_regions: nil)
                        
                        // buf now contains raw BGRA bitmap.
                        print("Example 8: Successfully rasterized into memory buffer.")
                    }
                } catch let e as NSError {
                    print("\(e)")
                    ret = 1
                }

            }
        } catch let e as NSError {
            print("\(e)")
            ret = 1
        }
        
        return ret
    }
}
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