pdfviewer: remove dependency on picture_utils. add utility function to render SkStream into bitmap.

experimental/PdfViewer/SkPdfRenderer.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 "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkForceLinking.h"
@@ skipping 2012 matching lines @@
     // TODO(edisonn): create static function that could return NULL if there are errors
     fPdfDoc = new SkNativeParsedPDF(inputFileName.c_str());
     if (fPdfDoc->pages() == 0) {
         delete fPdfDoc;
         fPdfDoc = NULL;
     }
 
     return fPdfDoc != NULL;
 }
 
+bool SkPdfRenderer::load(SkStream* stream) {
+    unload();
+
+    // TODO(edisonn): create static function that could return NULL if there are errors
+    fPdfDoc = new SkNativeParsedPDF(stream);
+    if (fPdfDoc->pages() == 0) {
+        delete fPdfDoc;
+        fPdfDoc = NULL;
+    }
+
+    return fPdfDoc != NULL;
+}
+
+
 int SkPdfRenderer::pages() const {
     return fPdfDoc != NULL ? fPdfDoc->pages() : 0;
 }
 
 void SkPdfRenderer::unload() {
     delete fPdfDoc;
     fPdfDoc = NULL;
 }
 
 SkRect SkPdfRenderer::MediaBox(int page) const {
     SkASSERT(fPdfDoc);
     return fPdfDoc->MediaBox(page);
 }
 
 size_t SkPdfRenderer::bytesUsed() const {
     return fPdfDoc ? fPdfDoc->bytesUsed() : 0;
 }
+
+bool SkPDFNativeRenderToBitmap(SkStream* stream,
+                               SkBitmap* output,
+                               int page,
+                               SkPdfContent content,
+                               double dpi) {
+    SkASSERT(page >= 0);
+    SkPdfRenderer renderer;
+    renderer.load(stream);
+    if (!renderer.loaded() || page >= renderer.pages() || page < 0) {
+        return false;
+    }
+
+    SkRect rect = renderer.MediaBox(page < 0 ? 0 :page);
+
+    SkScalar width = SkScalarMul(rect.width(),  SkDoubleToScalar(sqrt(dpi / 72.0)));
+    SkScalar height = SkScalarMul(rect.height(),  SkDoubleToScalar(sqrt(dpi / 72.0)));
+
+    rect = SkRect::MakeWH(width, height);
+
+    setup_bitmap(output, (int)SkScalarToDouble(width), (int)SkScalarToDouble(height));
+
+    SkAutoTUnref<SkDevice> device(SkNEW_ARGS(SkDevice, (*output)));
+    SkCanvas canvas(device);
+
+    return renderer.renderPage(page, &canvas, rect);
+}