pdfviewer: absolute minimal; to al least render (even if poorly) ICC based color spaces, based on RGB

Review URL: https://codereview.chromium.org/22624002

git-svn-id: http://skia.googlecode.com/svn/trunk@10630 2bbb7eff-a529-9590-31e7-b0007b416f81

2 files changed, 56 insertions, 2 deletions

diff --git a/experimental/PdfViewer/SkPdfRenderer.cpp b/experimental/PdfViewer/SkPdfRenderer.cpp
index e2197b0296..68501749ef 100644
--- a/experimental/PdfViewer/SkPdfRenderer.cpp
+++ b/experimental/PdfViewer/SkPdfRenderer.cpp
@@ -1586,8 +1586,49 @@ static PdfResult PdfOp_TJ(PdfContext* pdfContext, SkCanvas* canvas, PdfTokenLoop
 }
 
 static PdfResult PdfOp_CS_cs(PdfContext* pdfContext, SkCanvas* canvas, SkPdfColorOperator* colorOperator) {
-    colorOperator->fColorSpace = pdfContext->fObjectStack.top()->strRef();    pdfContext->fObjectStack.pop();
-    return kOK_PdfResult;
+    SkPdfObject* name = pdfContext->fObjectStack.top();    pdfContext->fObjectStack.pop();
+
+    //Next, get the ColorSpace Dictionary from the Resource Dictionary:
+    SkPdfDictionary* colorSpaceResource = pdfContext->fGraphicsState.fResources->ColorSpace(pdfContext->fPdfDoc);
+
+    SkPdfObject* colorSpace = pdfContext->fPdfDoc->resolveReference(colorSpaceResource->get(name));
+
+    if (colorSpace == NULL) {
+        colorOperator->fColorSpace = name->strRef();
+    } else {
+#ifdef PDF_TRACE
+        printf("CS = %s\n", colorSpace->toString(0, 0).c_str());
+#endif   // PDF_TRACE
+        if (colorSpace->isName()) {
+            colorOperator->fColorSpace = colorSpace->strRef();
+        } else if (colorSpace->isArray()) {
+            int cnt = colorSpace->size();
+            if (cnt == 0) {
+                return kIgnoreError_PdfResult;
+            }
+            SkPdfObject* type = colorSpace->objAtAIndex(0);
+            type = pdfContext->fPdfDoc->resolveReference(type);
+
+            if (type->isName("ICCBased")) {
+                if (cnt != 2) {
+                    return kIgnoreError_PdfResult;
+                }
+                SkPdfObject* prop = colorSpace->objAtAIndex(1);
+                prop = pdfContext->fPdfDoc->resolveReference(prop);
+#ifdef PDF_TRACE
+                printf("ICCBased prop = %s\n", prop->toString(0, 0).c_str());
+#endif   // PDF_TRACE
+                // TODO(edisonn): hack
+                if (prop && prop->isDictionary() && prop->get("N") &&  prop->get("N")->isInteger() && prop->get("N")->intValue() == 3) {
+                    colorOperator->setColorSpace(&strings_DeviceRGB);
+                    return kPartial_PdfResult;
+                }
+                return kNYI_PdfResult;
+            }
+        }
+    }
+
+    return kPartial_PdfResult;
 }
 
 static PdfResult PdfOp_CS(PdfContext* pdfContext, SkCanvas* canvas, PdfTokenLooper** looper) {
diff --git a/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp b/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp
index 2e7e670ce9..d9f680cc3e 100644
--- a/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp
+++ b/experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.cpp
@@ -207,6 +207,18 @@ void SkNativeParsedPDF::loadWithoutXRef() {
         current = skipPdfWhiteSpaces(0, current, end);
     }
 
+    // TODO(edisonn): hack, detect root catalog - we need to implement liniarized support, and remove this hack.
+    if (!fRootCatalogRef) {
+        for (unsigned int i = 0 ; i < objects(); i++) {
+            SkPdfObject* obj = object(i);
+            SkPdfObject* root = (obj && obj->isDictionary()) ? obj->get("Root") : NULL;
+            if (root && root->isReference()) {
+                fRootCatalogRef = root;
+            }
+        }
+    }
+
+
     if (fRootCatalogRef) {
         fRootCatalog = (SkPdfCatalogDictionary*)resolveReference(fRootCatalogRef);
         if (fRootCatalog->isDictionary() && fRootCatalog->valid()) {
@@ -217,6 +229,7 @@ void SkNativeParsedPDF::loadWithoutXRef() {
         }
     }
 
+
 }
 
 // TODO(edisonn): NYI