halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016 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 "SkMultiPictureDocument.h" |
| 9 | #include "SkMultiPictureDocumentPriv.h" |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 10 | #include "SkNWayCanvas.h" |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 11 | #include "SkPicture.h" |
| 12 | #include "SkPictureRecorder.h" |
| 13 | #include "SkStream.h" |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 14 | #include "SkTArray.h" |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 15 | |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 16 | #include <limits.h> |
| 17 | |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 18 | /* |
| 19 | File format: |
| 20 | BEGINNING_OF_FILE: |
| 21 | kMagic |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 22 | uint32_t version_number (==2) |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 23 | uint32_t page_count |
| 24 | { |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 25 | float sizeX |
| 26 | float sizeY |
| 27 | } * page_count |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 28 | skp file |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 29 | */ |
| 30 | |
| 31 | namespace { |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 32 | // The unique file signature for this file type. |
| 33 | static constexpr char kMagic[] = "Skia Multi-Picture Doc\n\n"; |
| 34 | |
| 35 | static constexpr char kEndPage[] = "SkMultiPictureEndPage"; |
| 36 | |
| 37 | const uint32_t kVersion = 2; |
| 38 | |
| 39 | static SkSize join(const SkTArray<SkSize>& sizes) { |
Hal Canary | fafe135 | 2017-04-11 12:12:02 -0400 | [diff] [blame] | 40 | SkSize joined = {0, 0}; |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 41 | for (SkSize s : sizes) { |
Hal Canary | fafe135 | 2017-04-11 12:12:02 -0400 | [diff] [blame] | 42 | joined = SkSize{SkTMax(joined.width(), s.width()), SkTMax(joined.height(), s.height())}; |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 43 | } |
| 44 | return joined; |
| 45 | } |
| 46 | |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 47 | static SkCanvas* trim(SkCanvas* canvas, |
| 48 | SkScalar w, SkScalar h, |
| 49 | const SkRect& trimBox) { |
| 50 | // Only trim if necessary. |
| 51 | if (trimBox != SkRect::MakeWH(w, h)) { |
| 52 | // All SkDocument implementations implement trimBox using a |
| 53 | // clip+translate. |
| 54 | canvas->clipRect(trimBox); |
| 55 | canvas->translate(trimBox.x(), trimBox.y()); |
| 56 | } |
| 57 | return canvas; |
| 58 | } |
| 59 | |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 60 | struct MultiPictureDocument final : public SkDocument { |
| 61 | SkPictureRecorder fPictureRecorder; |
halcanary | 59d6402 | 2016-06-14 11:06:37 -0700 | [diff] [blame] | 62 | SkSize fCurrentPageSize; |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 63 | SkTArray<sk_sp<SkPicture>> fPages; |
| 64 | SkTArray<SkSize> fSizes; |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 65 | MultiPictureDocument(SkWStream* s, void (*d)(SkWStream*, bool)) |
| 66 | : SkDocument(s, d) {} |
Brian Salomon | d3b6597 | 2017-03-22 12:05:03 -0400 | [diff] [blame] | 67 | ~MultiPictureDocument() override { this->close(); } |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 68 | |
| 69 | SkCanvas* onBeginPage(SkScalar w, SkScalar h, const SkRect& c) override { |
halcanary | 59d6402 | 2016-06-14 11:06:37 -0700 | [diff] [blame] | 70 | fCurrentPageSize.set(w, h); |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 71 | return trim(fPictureRecorder.beginRecording(w, h), w, h, c); |
| 72 | } |
| 73 | void onEndPage() override { |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 74 | fSizes.push_back(fCurrentPageSize); |
| 75 | fPages.push_back(fPictureRecorder.finishRecordingAsPicture()); |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 76 | } |
reed | d14df7c | 2016-09-22 14:12:46 -0700 | [diff] [blame] | 77 | void onClose(SkWStream* wStream) override { |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 78 | SkASSERT(wStream); |
| 79 | SkASSERT(wStream->bytesWritten() == 0); |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 80 | wStream->writeText(kMagic); |
| 81 | wStream->write32(kVersion); |
reed | d14df7c | 2016-09-22 14:12:46 -0700 | [diff] [blame] | 82 | wStream->write32(SkToU32(fPages.count())); |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 83 | for (SkSize s : fSizes) { |
reed | d14df7c | 2016-09-22 14:12:46 -0700 | [diff] [blame] | 84 | wStream->write(&s, sizeof(s)); |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 85 | } |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 86 | SkSize bigsize = join(fSizes); |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 87 | SkCanvas* c = fPictureRecorder.beginRecording(SkRect::MakeSize(bigsize)); |
| 88 | for (const sk_sp<SkPicture>& page : fPages) { |
| 89 | c->drawPicture(page); |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 90 | c->drawAnnotation(SkRect::MakeEmpty(), kEndPage, nullptr); |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 91 | } |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 92 | sk_sp<SkPicture> p = fPictureRecorder.finishRecordingAsPicture(); |
| 93 | p->serialize(wStream); |
| 94 | fPages.reset(); |
| 95 | fSizes.reset(); |
reed | d14df7c | 2016-09-22 14:12:46 -0700 | [diff] [blame] | 96 | return; |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 97 | } |
halcanary | c966ef9 | 2016-08-23 09:15:04 -0700 | [diff] [blame] | 98 | void onAbort() override { |
| 99 | fPages.reset(); |
| 100 | fSizes.reset(); |
| 101 | } |
halcanary | 45420a9 | 2016-06-02 12:41:14 -0700 | [diff] [blame] | 102 | }; |
| 103 | } |
| 104 | |
| 105 | sk_sp<SkDocument> SkMakeMultiPictureDocument(SkWStream* wStream) { |
| 106 | return sk_make_sp<MultiPictureDocument>(wStream, nullptr); |
| 107 | } |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 108 | |
| 109 | //////////////////////////////////////////////////////////////////////////////// |
| 110 | |
| 111 | int SkMultiPictureDocumentReadPageCount(SkStreamSeekable* stream) { |
| 112 | if (!stream) { |
| 113 | return 0; |
| 114 | } |
| 115 | stream->seek(0); |
| 116 | const size_t size = sizeof(kMagic) - 1; |
| 117 | char buffer[size]; |
| 118 | if (size != stream->read(buffer, size) || 0 != memcmp(kMagic, buffer, size)) { |
| 119 | stream = nullptr; |
| 120 | return 0; |
| 121 | } |
| 122 | uint32_t versionNumber = stream->readU32(); |
| 123 | if (versionNumber != kVersion) { |
| 124 | return 0; |
| 125 | } |
| 126 | uint32_t pageCount = stream->readU32(); |
| 127 | if (pageCount > INT_MAX) { |
| 128 | return 0; |
| 129 | } |
| 130 | // leave stream position right here. |
| 131 | return (int)pageCount; |
| 132 | } |
| 133 | |
| 134 | bool SkMultiPictureDocumentReadPageSizes(SkStreamSeekable* stream, |
| 135 | SkDocumentPage* dstArray, |
| 136 | int dstArrayCount) { |
| 137 | if (!dstArray || dstArrayCount < 1) { |
| 138 | return false; |
| 139 | } |
| 140 | int pageCount = SkMultiPictureDocumentReadPageCount(stream); |
| 141 | if (pageCount < 1 || pageCount != dstArrayCount) { |
| 142 | return false; |
| 143 | } |
| 144 | for (int i = 0; i < pageCount; ++i) { |
| 145 | SkSize& s = dstArray[i].fSize; |
| 146 | if (sizeof(s) != stream->read(&s, sizeof(s))) { |
| 147 | return false; |
| 148 | } |
| 149 | } |
| 150 | // leave stream position right here. |
| 151 | return true; |
| 152 | } |
| 153 | |
| 154 | namespace { |
| 155 | struct PagerCanvas : public SkNWayCanvas { |
| 156 | SkPictureRecorder fRecorder; |
| 157 | SkDocumentPage* fDst; |
| 158 | int fCount; |
| 159 | int fIndex = 0; |
| 160 | PagerCanvas(SkISize wh, SkDocumentPage* dst, int count) |
| 161 | : SkNWayCanvas(wh.width(), wh.height()), fDst(dst), fCount(count) { |
| 162 | this->nextCanvas(); |
| 163 | } |
| 164 | void nextCanvas() { |
| 165 | if (fIndex < fCount) { |
| 166 | SkRect bounds = SkRect::MakeSize(fDst[fIndex].fSize); |
| 167 | this->addCanvas(fRecorder.beginRecording(bounds)); |
| 168 | } |
| 169 | } |
| 170 | void onDrawAnnotation(const SkRect& r, const char* key, SkData* d) override { |
| 171 | if (0 == strcmp(key, kEndPage)) { |
| 172 | this->removeAll(); |
| 173 | if (fIndex < fCount) { |
| 174 | fDst[fIndex].fPicture = fRecorder.finishRecordingAsPicture(); |
| 175 | ++fIndex; |
| 176 | } |
| 177 | this->nextCanvas(); |
| 178 | } else { |
| 179 | this->SkNWayCanvas::onDrawAnnotation(r, key, d); |
| 180 | } |
| 181 | } |
| 182 | }; |
| 183 | } // namespace |
| 184 | |
| 185 | bool SkMultiPictureDocumentRead(SkStreamSeekable* stream, |
| 186 | SkDocumentPage* dstArray, |
| 187 | int dstArrayCount) { |
| 188 | if (!SkMultiPictureDocumentReadPageSizes(stream, dstArray, dstArrayCount)) { |
| 189 | return false; |
| 190 | } |
Hal Canary | fafe135 | 2017-04-11 12:12:02 -0400 | [diff] [blame] | 191 | SkSize joined = {0.0f, 0.0f}; |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 192 | for (int i = 0; i < dstArrayCount; ++i) { |
Hal Canary | fafe135 | 2017-04-11 12:12:02 -0400 | [diff] [blame] | 193 | joined = SkSize{SkTMax(joined.width(), dstArray[i].fSize.width()), |
| 194 | SkTMax(joined.height(), dstArray[i].fSize.height())}; |
Hal Canary | 45cde31 | 2017-04-03 16:06:42 -0400 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | auto picture = SkPicture::MakeFromStream(stream); |
| 198 | |
| 199 | PagerCanvas canvas(joined.toCeil(), dstArray, dstArrayCount); |
| 200 | // Must call playback(), not drawPicture() to reach |
| 201 | // PagerCanvas::onDrawAnnotation(). |
| 202 | picture->playback(&canvas); |
| 203 | if (canvas.fIndex != dstArrayCount) { |
| 204 | SkDEBUGF(("Malformed SkMultiPictureDocument\n")); |
| 205 | } |
| 206 | return true; |
| 207 | } |