halcanary | daefa5b | 2014-08-27 13:00:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2014 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "SkDocument.h" |
| 9 | #include "SkCanvas.h" |
| 10 | #include "SkImageGenerator.h" |
| 11 | #include "SkData.h" |
| 12 | #include "SkStream.h" |
| 13 | #include "SkDecodingImageGenerator.h" |
| 14 | |
| 15 | #include "Resources.h" |
| 16 | #include "Test.h" |
| 17 | |
| 18 | // Returned bitmap is lazy. Only lazy bitmaps hold onto the original data. |
| 19 | static SkBitmap bitmap_from_data(SkData* data) { |
| 20 | SkASSERT(data); |
| 21 | SkBitmap bm; |
| 22 | SkInstallDiscardablePixelRef( |
| 23 | SkDecodingImageGenerator::Create( |
| 24 | data, SkDecodingImageGenerator::Options()), &bm); |
| 25 | return bm; |
| 26 | } |
| 27 | |
| 28 | static bool is_subset_of(SkData* smaller, SkData* larger) { |
| 29 | SkASSERT(smaller && larger); |
| 30 | if (smaller->size() > larger->size()) { |
| 31 | return false; |
| 32 | } |
| 33 | size_t size = smaller->size(); |
| 34 | size_t size_diff = larger->size() - size; |
| 35 | for (size_t i = 0; i <= size_diff; ++i) { |
| 36 | if (0 == memcmp(larger->bytes() + i, smaller->bytes(), size)) { |
| 37 | return true; |
| 38 | } |
| 39 | } |
| 40 | return false; |
| 41 | } |
| 42 | |
| 43 | |
| 44 | static SkData* load_resource( |
| 45 | skiatest::Reporter* r, const char* test, const char* filename) { |
| 46 | SkString path(GetResourcePath(filename)); |
| 47 | SkData* data = SkData::NewFromFileName(path.c_str()); |
| 48 | if (!data && r->verbose()) { |
| 49 | SkDebugf("\n%s: Resource '%s' can not be found.\n", |
| 50 | test, filename); |
| 51 | } |
| 52 | return data; // May return NULL. |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Test that for Jpeg files that use the JFIF colorspace, they are |
| 57 | * directly embedded into the PDF (without re-encoding) when that |
| 58 | * makes sense. |
| 59 | */ |
| 60 | DEF_TEST(PDFJpegEmbedTest, r) { |
| 61 | const char test[] = "PDFJpegEmbedTest"; |
| 62 | SkAutoTUnref<SkData> mandrillData( |
| 63 | load_resource(r, test, "mandrill_512_q075.jpg")); |
| 64 | SkAutoTUnref<SkData> cmykData(load_resource(r, test, "CMYK.jpg")); |
| 65 | if (!mandrillData || !cmykData) { |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | SkDynamicMemoryWStream pdf; |
| 70 | SkAutoTUnref<SkDocument> document(SkDocument::CreatePDF(&pdf)); |
| 71 | SkCanvas* canvas = document->beginPage(642, 1028); |
| 72 | |
| 73 | canvas->clear(SK_ColorLTGRAY); |
| 74 | |
| 75 | SkBitmap bm1(bitmap_from_data(mandrillData)); |
| 76 | canvas->drawBitmap(bm1, 65.0, 0.0, NULL); |
| 77 | SkBitmap bm2(bitmap_from_data(cmykData)); |
| 78 | canvas->drawBitmap(bm2, 0.0, 512.0, NULL); |
| 79 | |
| 80 | canvas->flush(); |
| 81 | document->endPage(); |
| 82 | document->close(); |
| 83 | SkAutoTUnref<SkData> pdfData(pdf.copyToData()); |
| 84 | SkASSERT(pdfData); |
| 85 | pdf.reset(); |
| 86 | |
| 87 | REPORTER_ASSERT(r, is_subset_of(mandrillData, pdfData)); |
| 88 | |
| 89 | // This JPEG uses a nonstandard colorspace - it can not be |
| 90 | // embedded into the PDF directly. |
| 91 | REPORTER_ASSERT(r, !is_subset_of(cmykData, pdfData)); |
| 92 | |
| 93 | // The following is for debugging purposes only. |
| 94 | const char* outputPath = getenv("SKIA_TESTS_PDF_JPEG_EMBED_OUTPUT_PATH"); |
| 95 | if (outputPath) { |
| 96 | SkFILEWStream output(outputPath); |
| 97 | if (output.isValid()) { |
| 98 | output.write(pdfData->data(), pdfData->size()); |
| 99 | } |
| 100 | } |
| 101 | } |