skia2/experimental/PdfViewer/pdf_viewer_main.cpp

309 lines
11 KiB
C++

/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBitmapDevice.h"
#include "SkCanvas.h"
#include "SkCommandLineFlags.h"
#include "SkDevice.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkImageEncoder.h"
#include "SkOSFile.h"
#include "SkPdfConfig.h"
#include "SkPdfRenderer.h"
#include "SkPicture.h"
#include "SkStream.h"
#include "SkTypeface.h"
#include "SkTArray.h"
#include "SkNulCanvas.h"
DEFINE_string2(readPath, r, "", "pdf files or directories of pdf files to process.");
DEFINE_string2(writePath, w, "", "Directory to write the rendered pages.");
DEFINE_bool2(noExtensionForOnePagePdf, n, false, "No page extension if only one page.");
DEFINE_bool2(showMemoryUsage, m, false, "Show Memory usage.");
DEFINE_string2(pages, p, "all", "What pages to render and how:\n"
"\tall - all pages\n"
"\treverse - all pages, in reverse order\n"
"\tfirst - first page\n"
"\tlast - last page\n"
"\tnumber - a specific page number\n"
);
DEFINE_double(DPI, 72, "DPI to be used for rendering (scale).");
DEFINE_int32(benchLoad, 0, "Load the pdf file minimally N times, without any rendering and \n"
"\tminimal parsing to ensure correctness. Default 0 (disabled).");
DEFINE_int32(benchRender, 0, "Render the pdf content N times. Default 0 (disabled)");
DEFINE_string2(config, c, "8888", "Canvas to render:\n"
"\t8888 - argb\n"
"\tnul - render in null canvas, any draw will just return.\n"
);
DEFINE_bool2(transparentBackground, t, false, "Make background transparent instead of white.");
/**
* Given list of directories and files to use as input, expects to find .pdf
* files and it will convert them to .png files writing them in the same directory
* one file for each page.
*
* Returns zero exit code if all .pdf files were converted successfully,
* otherwise returns error code 1.
*/
static const char PDF_FILE_EXTENSION[] = "pdf";
static const char PNG_FILE_EXTENSION[] = "png";
/** Replaces the extension of a file.
* @param path File name whose extension will be changed.
* @param old_extension The old extension.
* @param new_extension The new extension.
* @returns false if the file did not has the expected extension.
* if false is returned, contents of path are undefined.
*/
static bool add_page_and_replace_filename_extension(SkString* path, int page,
const char old_extension[],
const char new_extension[]) {
if (path->endsWith(old_extension)) {
path->remove(path->size() - strlen(old_extension),
strlen(old_extension));
if (!path->endsWith(".")) {
return false;
}
if (page >= 0) {
path->appendf("%i.", page);
}
path->append(new_extension);
return true;
}
return false;
}
/** Builds the output filename. path = dir/name, and it replaces expected
* .skp extension with .pdf extention.
* @param path Output filename.
* @param name The name of the file.
* @returns false if the file did not has the expected extension.
* if false is returned, contents of path are undefined.
*/
static bool make_output_filepath(SkString* path, const SkString& dir,
const SkString& name,
int page) {
*path = SkOSPath::Join(dir.c_str(), name.c_str());
return add_page_and_replace_filename_extension(path, page,
PDF_FILE_EXTENSION,
PNG_FILE_EXTENSION);
}
static void setup_bitmap(SkBitmap* bitmap, int width, int height, SkColor color) {
bitmap->allocN32Pixels(width, height);
bitmap->eraseColor(color);
}
/** Write the output of pdf renderer to a file.
* @param outputDir Output dir.
* @param inputFilename The skp file that was read.
* @param renderer The object responsible to write the pdf file.
* @param page -1 means there is only one page (0), and render in a file without page extension
*/
#ifdef PDF_TRACE_DIFF_IN_PNG
extern "C" SkBitmap* gDumpBitmap;
extern "C" SkCanvas* gDumpCanvas;
#endif
static bool render_page(const SkString& outputDir,
const SkString& inputFilename,
const SkPdfRenderer& renderer,
int page) {
SkRect rect = renderer.MediaBox(page < 0 ? 0 :page);
// Exercise all pdf codepaths as in normal rendering, but no actual bits are changed.
if (!FLAGS_config.isEmpty() && strcmp(FLAGS_config[0], "nul") == 0) {
SkBitmap bitmap;
SkAutoTUnref<SkBaseDevice> device(SkNEW_ARGS(SkBitmapDevice, (bitmap)));
SkNulCanvas canvas(device);
renderer.renderPage(page < 0 ? 0 : page, &canvas, rect);
} else {
// 8888
SkRect rect = renderer.MediaBox(page < 0 ? 0 :page);
SkBitmap bitmap;
SkScalar width = SkScalarMul(rect.width(), SkDoubleToScalar(FLAGS_DPI / 72.0));
SkScalar height = SkScalarMul(rect.height(), SkDoubleToScalar(FLAGS_DPI / 72.0));
rect = SkRect::MakeWH(width, height);
SkColor background = FLAGS_transparentBackground ? SK_ColorTRANSPARENT : SK_ColorWHITE;
#ifdef PDF_DEBUG_3X
setup_bitmap(&bitmap, 3 * (int)SkScalarToDouble(width), 3 * (int)SkScalarToDouble(height),
background);
#else
setup_bitmap(&bitmap, (int)SkScalarToDouble(width), (int)SkScalarToDouble(height),
background);
#endif
SkAutoTUnref<SkBaseDevice> device;
if (strcmp(FLAGS_config[0], "8888") == 0) {
device.reset(SkNEW_ARGS(SkBitmapDevice, (bitmap)));
} else {
SkDebugf("unknown --config: %s\n", FLAGS_config[0]);
return false;
}
SkCanvas canvas(device);
#ifdef PDF_TRACE_DIFF_IN_PNG
gDumpBitmap = &bitmap;
gDumpCanvas = &canvas;
#endif
renderer.renderPage(page < 0 ? 0 : page, &canvas, rect);
SkString outputPath;
if (!make_output_filepath(&outputPath, outputDir, inputFilename, page)) {
return false;
}
SkImageEncoder::EncodeFile(outputPath.c_str(), bitmap, SkImageEncoder::kPNG_Type, 100);
if (FLAGS_showMemoryUsage) {
SkDebugf("Memory usage after page %i rendered: %u\n",
page < 0 ? 0 : page, (unsigned int)renderer.bytesUsed());
}
}
return true;
}
/** Reads an skp file, renders it to pdf and writes the output to a pdf file
* @param inputPath The skp file to be read.
* @param outputDir Output dir.
*/
static bool process_pdf(const SkString& inputPath, const SkString& outputDir) {
SkDebugf("Loading PDF: %s\n", inputPath.c_str());
SkString inputFilename = SkOSPath::Basename(inputPath.c_str());
SkAutoTDelete<SkPdfRenderer> renderer(SkPdfRenderer::CreateFromFile(inputPath.c_str()));
if (NULL == renderer.get()) {
SkDebugf("Failure loading file %s\n", inputPath.c_str());
return false;
}
if (FLAGS_showMemoryUsage) {
SkDebugf("Memory usage after load: %u\n", (unsigned int) renderer->bytesUsed());
}
// TODO(edisonn): bench timers
if (FLAGS_benchLoad > 0) {
for (int i = 0 ; i < FLAGS_benchLoad; i++) {
SkAutoTDelete<SkPdfRenderer> benchRenderer(
SkPdfRenderer::CreateFromFile(inputPath.c_str()));
if (NULL == benchRenderer.get()) {
SkDebugf("Failed to load on %ith attempt\n", i);
} else if (FLAGS_showMemoryUsage) {
SkDebugf("Memory usage after load %i number : %u\n", i,
(unsigned int) benchRenderer->bytesUsed());
}
}
}
if (!renderer->pages()) {
// This should never happen, since CreateFromFile will return NULL if there are no pages.
SkASSERT(false);
SkDebugf("ERROR: Empty PDF Document %s\n", inputPath.c_str());
return false;
}
bool success = true;
for (int i = 0; i < FLAGS_benchRender + 1; i++) {
// TODO(edisonn) if (i == 1) start timer
if (strcmp(FLAGS_pages[0], "all") == 0) {
for (int pn = 0; pn < renderer->pages(); ++pn) {
success &= render_page(outputDir, inputFilename, *renderer,
FLAGS_noExtensionForOnePagePdf && renderer->pages() == 1 ? -1 : pn);
}
} else if (strcmp(FLAGS_pages[0], "reverse") == 0) {
for (int pn = renderer->pages() - 1; pn >= 0; --pn) {
success &= render_page(outputDir, inputFilename, *renderer,
FLAGS_noExtensionForOnePagePdf && renderer->pages() == 1 ? -1 : pn);
}
} else if (strcmp(FLAGS_pages[0], "first") == 0) {
success &= render_page(outputDir, inputFilename, *renderer,
FLAGS_noExtensionForOnePagePdf && renderer->pages() == 1 ? -1 : 0);
} else if (strcmp(FLAGS_pages[0], "last") == 0) {
success &= render_page(outputDir, inputFilename, *renderer,
FLAGS_noExtensionForOnePagePdf && renderer->pages() == 1 ? -1
: renderer->pages() - 1);
} else {
int pn = atoi(FLAGS_pages[0]);
success &= render_page(outputDir, inputFilename, *renderer,
FLAGS_noExtensionForOnePagePdf && renderer->pages() == 1 ? -1 : pn);
}
}
if (!success) {
SkDebugf("Failures for file %s\n", inputPath.c_str());
}
return success;
}
/** For each file in the directory or for the file passed in input, call
* parse_pdf.
* @param input A directory or an pdf file.
* @param outputDir Output dir.
*/
static int process_input(const char* input, const SkString& outputDir) {
int failures = 0;
if (sk_isdir(input)) {
SkOSFile::Iter iter(input, PDF_FILE_EXTENSION);
SkString inputFilename;
while (iter.next(&inputFilename)) {
SkString inputPath = SkOSPath::Join(input, inputFilename.c_str());
if (!process_pdf(inputPath, outputDir)) {
++failures;
}
}
} else {
SkString inputPath(input);
if (!process_pdf(inputPath, outputDir)) {
++failures;
}
}
return failures;
}
int tool_main(int argc, char** argv);
int tool_main(int argc, char** argv) {
SkCommandLineFlags::SetUsage("Parse and Render .pdf files (pdf viewer).");
SkCommandLineFlags::Parse(argc, argv);
if (FLAGS_readPath.isEmpty()) {
SkDebugf(".pdf files or directories are required.\n");
exit(-1);
}
SkString outputDir;
if (FLAGS_writePath.count() == 1) {
outputDir.set(FLAGS_writePath[0]);
}
int failures = 0;
for (int i = 0; i < FLAGS_readPath.count(); i ++) {
failures += process_input(FLAGS_readPath[i], outputDir);
}
reportPdfRenderStats();
if (failures != 0) {
SkDebugf("Failed to render %i PDFs.\n", failures);
return 1;
}
return 0;
}
#if !defined SK_BUILD_FOR_IOS
int main(int argc, char * const argv[]) {
return tool_main(argc, (char**) argv);
}
#endif