skia2/tests/PDFJpegEmbedTest.cpp
halcanary a8448bc3df PDF: Correctly embed JPEG images directly into PDF output.
We only embed images with YUV planes.  That should only grab the
subset of color JPEGs supported by PDF.

BUG=skia:3180

Review URL: https://codereview.chromium.org/1025773002
2015-04-17 13:27:24 -07:00

90 lines
2.5 KiB
C++

/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkDocument.h"
#include "SkCanvas.h"
#include "SkImageGenerator.h"
#include "SkData.h"
#include "SkStream.h"
#include "Resources.h"
#include "Test.h"
// Returned bitmap is lazy. Only lazy bitmaps hold onto the original data.
static SkBitmap bitmap_from_data(SkData* data) {
SkASSERT(data);
SkBitmap bm;
SkInstallDiscardablePixelRef(data, &bm);
return bm;
}
static bool is_subset_of(SkData* smaller, SkData* larger) {
SkASSERT(smaller && larger);
if (smaller->size() > larger->size()) {
return false;
}
size_t size = smaller->size();
size_t size_diff = larger->size() - size;
for (size_t i = 0; i <= size_diff; ++i) {
if (0 == memcmp(larger->bytes() + i, smaller->bytes(), size)) {
return true;
}
}
return false;
}
static SkData* load_resource(
skiatest::Reporter* r, const char* test, const char* filename) {
SkString path(GetResourcePath(filename));
SkData* data = SkData::NewFromFileName(path.c_str());
if (!data && r->verbose()) {
SkDebugf("\n%s: Resource '%s' can not be found.\n",
test, filename);
}
return data; // May return NULL.
}
/**
* Test that for Jpeg files that use the JFIF colorspace, they are
* directly embedded into the PDF (without re-encoding) when that
* makes sense.
*/
DEF_TEST(PDFJpegEmbedTest, r) {
const char test[] = "PDFJpegEmbedTest";
SkAutoTUnref<SkData> mandrillData(
load_resource(r, test, "mandrill_512_q075.jpg"));
SkAutoTUnref<SkData> cmykData(load_resource(r, test, "CMYK.jpg"));
if (!mandrillData || !cmykData) {
return;
}
SkDynamicMemoryWStream pdf;
SkAutoTUnref<SkDocument> document(SkDocument::CreatePDF(&pdf));
SkCanvas* canvas = document->beginPage(642, 1028);
canvas->clear(SK_ColorLTGRAY);
SkBitmap bm1(bitmap_from_data(mandrillData));
canvas->drawBitmap(bm1, 65.0, 0.0, NULL);
SkBitmap bm2(bitmap_from_data(cmykData));
canvas->drawBitmap(bm2, 0.0, 512.0, NULL);
canvas->flush();
document->endPage();
document->close();
SkAutoTUnref<SkData> pdfData(pdf.copyToData());
SkASSERT(pdfData);
pdf.reset();
REPORTER_ASSERT(r, is_subset_of(mandrillData, pdfData));
// This JPEG uses a nonstandard colorspace - it can not be
// embedded into the PDF directly.
REPORTER_ASSERT(r, !is_subset_of(cmykData, pdfData));
}