JPEG(JFIF only) directly embedded into PDF
R=reed@google.com, djsollen@google.com, mtklein@google.com
Author: halcanary@google.com
Review URL: https://codereview.chromium.org/515493003
diff --git a/tests/PDFJpegEmbedTest.cpp b/tests/PDFJpegEmbedTest.cpp
new file mode 100644
index 0000000..c1d0ea8
--- /dev/null
+++ b/tests/PDFJpegEmbedTest.cpp
@@ -0,0 +1,101 @@
+/*
+ * 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 "SkDecodingImageGenerator.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(
+ SkDecodingImageGenerator::Create(
+ data, SkDecodingImageGenerator::Options()), &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));
+
+ // The following is for debugging purposes only.
+ const char* outputPath = getenv("SKIA_TESTS_PDF_JPEG_EMBED_OUTPUT_PATH");
+ if (outputPath) {
+ SkFILEWStream output(outputPath);
+ if (output.isValid()) {
+ output.write(pdfData->data(), pdfData->size());
+ }
+ }
+}