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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkCommandLineFlags.h"
#include "SkDocument.h"
#include "SkForceLinking.h"
#include "SkGraphics.h"
#include "SkMD5.h"
#include "SkOSFile.h"
#include "SkPicture.h"
#include "SkStream.h"
#include "SkTArray.h"
#include "SkTSort.h"
static const char kUsage[] =
"This program takes a list of Skia Picture (SKP) files and renders\n"
"each as a multipage PDF, then prints out the MD5 checksum of the\n"
"PDF file. This can be used to verify that changes to the PDF\n"
"backend will not change PDF output.\n";
__SK_FORCE_IMAGE_DECODER_LINKING;
DEFINE_string2(inputPaths,
r,
"",
"A list of directories and files to use as input.\n"
"Files are expected to have the .skp extension.");
static const char SKP_FILE_EXTENSION[] = ".skp";
// Used by SkTQSort<SkString>()
static bool operator<(const SkString& a, const SkString& b) {
return strcmp(a.c_str(), b.c_str()) < 0;
}
// Process --inputPaths defined on the command line. Return false if
// no files found.
static bool process_input_files(SkTArray<SkString>* files) {
for (int i = 0; i < FLAGS_inputPaths.count(); i++) {
const char* input = FLAGS_inputPaths[i];
if (sk_isdir(input)) {
SkOSFile::Iter iter(input, SKP_FILE_EXTENSION);
SkString inputFilename;
while (iter.next(&inputFilename)) {
files->push_back(SkOSPath::Join(input, inputFilename.c_str()));
}
} else {
if (SkStrEndsWith(input, SKP_FILE_EXTENSION)) {
if (sk_exists(input)) {
files->push_back(SkString(input));
} else {
SkDebugf("file_does_not_exist %s\n", input);
}
} else {
SkDebugf("skipping_file %s\n", input);
}
}
}
if (files->count() > 0) {
SkTQSort<SkString>(files->begin(), files->end() - 1);
return true;
}
return false;
}
// Print the given SkPicture to a PDF, breaking on 8.5x11 pages.
static void picture_to_pdf(const SkPicture& picture, SkWStream* out) {
SkAutoTUnref<SkDocument> pdfDocument(SkDocument::CreatePDF(out));
int width = picture.cullRect().width();
int height = picture.cullRect().height();
const int kLetterWidth = 612; // 8.5 * 72
const int kLetterHeight = 792; // 11 * 72
SkRect letterRect = SkRect::MakeWH(SkIntToScalar(kLetterWidth),
SkIntToScalar(kLetterHeight));
int xPages = ((width - 1) / kLetterWidth) + 1;
int yPages = ((height - 1) / kLetterHeight) + 1;
for (int y = 0; y < yPages; ++y) {
for (int x = 0; x < xPages; ++x) {
int w = SkTMin(kLetterWidth, width - (x * kLetterWidth));
int h = SkTMin(kLetterHeight, height - (y * kLetterHeight));
SkCanvas* canvas = pdfDocument->beginPage(w, h);
canvas->clipRect(letterRect);
canvas->translate(SkIntToScalar(-kLetterWidth * x),
SkIntToScalar(-kLetterHeight * y));
canvas->drawPicture(&picture);
canvas->flush();
pdfDocument->endPage();
}
}
pdfDocument->close();
out->flush();
}
static bool skp_to_pdf_md5(SkStream* input, SkMD5::Digest* digest) {
SkAutoTUnref<SkPicture> picture(SkPicture::CreateFromStream(input));
if (NULL == picture.get()) {
return false;
}
SkMD5 checksumWStream;
picture_to_pdf(*picture, &checksumWStream);
checksumWStream.finish(*digest);
return true;
}
SkString digest_to_hex(const SkMD5::Digest& digest) {
static const char kHex[] = "0123456789ABCDEF";
SkString string(2 * sizeof(digest.data));
char* p = string.writable_str();
for (size_t i = 0; i < sizeof(digest.data); ++i) {
uint8_t c = digest.data[i];
*(p++) = kHex[c >> 4];
*(p++) = kHex[c & 0xF];
}
return string;
}
int main(int argc, char** argv) {
SkCommandLineFlags::SetUsage(kUsage);
SkCommandLineFlags::Parse(argc, argv);
SkAutoGraphics ag;
int successCount = 0;
SkTArray<SkString> files;
if (!process_input_files(&files)) {
SkDebugf("You need to specify a --inputPaths option.\n");
return 1;
}
for (int i = 0; i < files.count(); ++i) {
SkString basename = SkOSPath::Basename(files[i].c_str());
SkFILEStream inputStream(files[i].c_str());
if (!inputStream.isValid()) {
SkDebugf("could_not_open %s\n", basename.c_str());
continue;
}
SkMD5::Digest digest;
if (!skp_to_pdf_md5(&inputStream, &digest)) {
SkDebugf("invalid_skp %s\n", basename.c_str());
continue;
}
SkString hexDigest = digest_to_hex(digest);
printf("%s %s\n", hexDigest.c_str(), basename.c_str());
++successCount;
}
return successCount == files.count() ? 0 : 1;
}
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