pdfviewer: 1) debug code for drawText (show magenta background for text, to show text even when we fail to load/show it), 2) some cleanup: refactor and rename classes and files

Review URL: https://codereview.chromium.org/23020003

git-svn-id: http://skia.googlecode.com/svn/trunk@10716 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 109 insertions, 0 deletions

diff --git a/experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.cpp b/experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.cpp
new file mode 100644
index 0000000000..b0f62aa8bd
--- /dev/null
+++ b/experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.cpp
@@ -0,0 +1,109 @@
+
+#include "SkPdfNativeObject.h"
+#include "SkPdfStreamCommonDictionary_autogen.h"
+
+#include "SkFlate.h"
+#include "SkStream.h"
+#include "SkPdfNativeTokenizer.h"
+
+#include "SkBitmap.h"
+#include "SkPdfFont.h"
+
+SkPdfNativeObject SkPdfNativeObject::kNull = SkPdfNativeObject::makeNull();
+
+bool SkPdfNativeObject::applyFlateDecodeFilter() {
+    if (!SkFlate::HaveFlate()) {
+        // TODO(edisonn): warn, make callers handle it
+        return false;
+    }
+
+    const unsigned char* old = fStr.fBuffer;
+    bool deleteOld = isStreamOwned();
+
+    SkMemoryStream skstream(fStr.fBuffer, fStr.fBytes >> 2, false);
+    SkDynamicMemoryWStream uncompressedData;
+
+    if (SkFlate::Inflate(&skstream, &uncompressedData)) {
+        fStr.fBytes = (uncompressedData.bytesWritten() << 2) + kOwnedStreamBit + kUnfilteredStreamBit;
+        fStr.fBuffer = (const unsigned char*)new unsigned char[uncompressedData.bytesWritten()];
+        uncompressedData.copyTo((void*)fStr.fBuffer);
+
+        if (deleteOld) {
+            delete[] old;
+        }
+
+        return true;
+    } else {
+        // TODO(edisonn): warn, make callers handle it
+        return false;
+    }
+}
+
+bool SkPdfNativeObject::applyDCTDecodeFilter() {
+    // this would fail, and it won't allow any more filters.
+    // technically, it would be possible, but not a real world scenario
+    // TODO(edisonn): or get the image here and store it for fast retrieval?
+    return false;
+}
+
+bool SkPdfNativeObject::applyFilter(const char* name) {
+    if (strcmp(name, "FlateDecode") == 0) {
+        return applyFlateDecodeFilter();
+    } else if (strcmp(name, "DCTDecode") == 0) {
+        return applyDCTDecodeFilter();
+    }
+    // TODO(edisonn): allert, not supported, but should be implemented asap
+    return false;
+}
+
+bool SkPdfNativeObject::filterStream() {
+    if (!hasStream()) {
+        return false;
+    }
+
+    if (isStreamFiltered()) {
+        return true;
+    }
+
+    SkPdfStreamCommonDictionary* stream = (SkPdfStreamCommonDictionary*)this;
+
+    if (!stream->has_Filter()) {
+        fStr.fBytes = ((fStr.fBytes >> 1) << 1) + kFilteredStreamBit;
+    } else if (stream->isFilterAName(NULL)) {
+        std::string filterName = stream->getFilterAsName(NULL);
+        applyFilter(filterName.c_str());
+    } else if (stream->isFilterAArray(NULL)) {
+        const SkPdfArray* filters = stream->getFilterAsArray(NULL);
+        int cnt = filters->size();
+        for (int i = cnt - 1; i >= 0; i--) {
+            const SkPdfNativeObject* filterName = filters->objAtAIndex(i);
+            if (filterName != NULL && filterName->isName()) {
+                if (!applyFilter(filterName->nameValue())) {
+                    break;
+                }
+            } else {
+                // TODO(edisonn): report warning
+            }
+        }
+    }
+
+    return true;
+}
+
+void SkPdfNativeObject::releaseData() {
+    if (fData) {
+        switch (fDataType) {
+            case kFont_Data:
+                delete (SkPdfFont*)fData;
+                break;
+            case kBitmap_Data:
+                delete (SkBitmap*)fData;
+                break;
+            default:
+                SkASSERT(false);
+                break;
+        }
+    }
+    fData = NULL;
+    fDataType = kEmpty_Data;
+}