David Planella has proposed merging lp:~ubuntu-docviewer-dev/ubuntu-docviewer-app/lo-viewer into lp:ubuntu-docviewer-app.
Requested reviews: Ubuntu Document Viewer Developers (ubuntu-docviewer-dev) For more details, see: https://code.launchpad.net/~ubuntu-docviewer-dev/ubuntu-docviewer-app/lo-viewer/+merge/262686 Added sample code as the first step to the LibreOffice viewer feature of docviewer. The code was provided by Bjoern Michaelsen, the Ubuntu LO maintaner, as a way to use the LO Toolkit API. Right now the sample code uses the LO Toolkit API to read a given document into a buffer and then it writes a .png file using libpng. For docviewer, we can probably convert the C++ code to Qt and assess whether it's needed to do the .png writing (I guess docviewer can use the buffer directly?), and create a QML plugin. The requirement for this to work is to have LibreOffice 5.0 installed (easily available from a PPA as described in the .cxx's file comments). I believe the easiest way to start experimenting is to develop on the desktop, prove that it works for Qt/QML and then we can worry about converting it to a .click once we've done that step. -- Your team Ubuntu Document Viewer Developers is requested to review the proposed merge of lp:~ubuntu-docviewer-dev/ubuntu-docviewer-app/lo-viewer into lp:ubuntu-docviewer-app.
=== added directory 'src/plugin/libreofficetoolkit-qml-plugin' === added file 'src/plugin/libreofficetoolkit-qml-plugin/libreoffice2png.cxx' --- src/plugin/libreofficetoolkit-qml-plugin/libreoffice2png.cxx 1970-01-01 00:00:00 +0000 +++ src/plugin/libreofficetoolkit-qml-plugin/libreoffice2png.cxx 2015-06-23 11:22:09 +0000 @@ -0,0 +1,133 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + */ + +// This short example shows how to use LibreOfficeKit to render (parts of) a +// document. As-is, it renders a full view of a document into a 250x250 pixel +// png, ignoring aspect ratio. Its using hardcoded Ubuntu/Debian paths to find +// the LibreOffice installation. +// +// Please install prerequisites if you havent done so: +// +// sudo apt install libreofficekit-dev libreoffice libpng12-dev +// +// Note that you need LibreOffice 5.0 -- a prerelease is currently available +// at the prereleases ppa: +// +// https://launchpad.net/~libreoffice/+archive/ubuntu/libreoffice-prereleases +// +// That ppa has versions for Ubuntu 15.10, 15.04, 14.04 LTS and 12.04 LTS. +// Although this should work on all releases, it has only been tested on Ubuntu +// 15.04 (vivid) so far. +// +// This example comes without a build system as presumably you would want to +// use a different one anyway. +// To compile/link this, save this file as libreoffice2png.cxx and run: +/* + g++ --std=c++11 -I/usr/include/LibreOfficeKit/ `pkg-config --cflags libpng` libreoffice2png.cxx `pkg-config --libs libpng` -ldl -o ./libreoffice2png + # or run this sh pipe : grep g++ ./libreoffice2png.cxx | sh +*/ +// You should be able to easily teach your build system of choice how to build +// based on the above. + + +#include <iostream> +#include <memory> +#include "png.h" +#include "assert.h" +#define LOK_USE_UNSTABLE_API +#include "LibreOfficeKitInit.h" +#include "LibreOfficeKit.hxx" + +constexpr png_uint_32 nCanvasHeight = 256; +constexpr png_uint_32 nCanvasWidth = 256; +constexpr png_uint_32 nCanvasDepth = 8; +constexpr png_uint_32 nBytesPerPixel = 4; + +// a simple RGBA buffer to render a document to +png_byte image[nCanvasHeight][nCanvasWidth*nBytesPerPixel]; +void write_png(const char*); + +int main(int argc, char** argv) +{ + long nDocWidth(0); + long nDocHeight(0); + if(argc != 3) + { + std::cerr << "libreoffice2png renders a document to a png file." << std::endl; + std::cerr << "usage: ./libreoffice2png <input-document> <output-png>" << std::endl; + return -1; + } + std::unique_ptr<lok::Office> pOffice(lok::lok_cpp_init("/usr/lib/libreoffice/program/")); + std::unique_ptr<lok::Document> pDocument(pOffice->documentLoad(argv[1])); + pDocument->initializeForRendering(); + std::cout << "Document type: " << pDocument->getDocumentType() << std::endl; + pDocument->getDocumentSize(&nDocWidth, &nDocHeight); + std::cout << "Document size: " << nDocWidth << "x" << nDocHeight << " twips" << std::endl; + pDocument->paintTile(&image[0][0], nCanvasHeight, nCanvasWidth, 0, 0, nDocWidth, nDocHeight); + write_png(argv[2]); + pDocument.reset(nullptr); + pOffice.reset(nullptr); + return 0; +} + +// only png writer code below this +#ifndef png_jmpbuf +# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf) +#endif + +void write_png(const char* file_name) +{ + + FILE* fp = fopen(file_name, "wb"); + if (!fp) + return; + + png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr); + + if (!png_ptr) + { + fclose(fp); + return; + } + + png_infop info_ptr = png_create_info_struct(png_ptr); + if (!info_ptr) + { + fclose(fp); + png_destroy_write_struct(&png_ptr, nullptr); + return; + } + + if (setjmp(png_jmpbuf(png_ptr))) + { + fclose(fp); + png_destroy_write_struct(&png_ptr, &info_ptr); + return; + } + + png_init_io(png_ptr, fp); + + png_set_IHDR(png_ptr, info_ptr, nCanvasWidth, nCanvasHeight, nCanvasDepth, PNG_COLOR_TYPE_RGB_ALPHA, + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + + png_write_info(png_ptr, info_ptr); + + assert(nCanvasHeight <= PNG_UINT_32_MAX/png_sizeof(png_bytep)); + png_bytep row_pointers[nCanvasHeight]; + + for (png_uint_32 row = 0; row < nCanvasHeight; ++row) + row_pointers[row] = &(image[row][0]); + + png_write_image(png_ptr, row_pointers); + png_write_end(png_ptr, info_ptr); + + png_destroy_write_struct(&png_ptr, &info_ptr); + fclose(fp); +} +/* vim: set noet sw=4 ts=4: */
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