SkPDF: move all pdf sources into src/pdf

src/doc/SkDocument.cpp

-/*
- * Copyright 2013 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 "SkStream.h"
-
-SkDocument::SkDocument(SkWStream* stream, void (*doneProc)(SkWStream*, bool)) {
-    fStream = stream;   // we do not own this object.
-    fDoneProc = doneProc;
-    fState = kBetweenPages_State;
-}
-
-SkDocument::~SkDocument() {
-    this->close();
-}
-
-SkCanvas* SkDocument::beginPage(SkScalar width, SkScalar height,
-                                const SkRect* content) {
-    if (width <= 0 || height <= 0) {
-        return nullptr;
-    }
-
-    SkRect outer = SkRect::MakeWH(width, height);
-    SkRect inner;
-    if (content) {
-        inner = *content;
-        if (!inner.intersect(outer)) {
-            return nullptr;
-        }
-    } else {
-        inner = outer;
-    }
-
-    for (;;) {
-        switch (fState) {
-            case kBetweenPages_State:
-                fState = kInPage_State;
-                return this->onBeginPage(width, height, inner);
-            case kInPage_State:
-                this->endPage();
-                break;
-            case kClosed_State:
-                return nullptr;
-        }
-    }
-    SkDEBUGFAIL("never get here");
-    return nullptr;
-}
-
-void SkDocument::endPage() {
-    if (kInPage_State == fState) {
-        fState = kBetweenPages_State;
-        this->onEndPage();
-    }
-}
-
-bool SkDocument::close() {
-    for (;;) {
-        switch (fState) {
-            case kBetweenPages_State: {
-                fState = kClosed_State;
-                bool success = this->onClose(fStream);
-
-                if (fDoneProc) {
-                    fDoneProc(fStream, false);
-                }
-                // we don't own the stream, but we mark it nullptr since we can
-                // no longer write to it.
-                fStream = nullptr;
-                return success;
-            }
-            case kInPage_State:
-                this->endPage();
-                break;
-            case kClosed_State:
-                return false;
-        }
-    }
-}
-
-void SkDocument::abort() {
-    this->onAbort();
-
-    fState = kClosed_State;
-    if (fDoneProc) {
-        fDoneProc(fStream, true);
-    }
-    // we don't own the stream, but we mark it nullptr since we can
-    // no longer write to it.
-    fStream = nullptr;
-}