Separate and update PDF_DIFF_TRACE_IN_PNG

experimental/PdfViewer/src/SkPdfDiffEncoder.cpp

Index: experimental/PdfViewer/src/SkPdfDiffEncoder.cpp
diff --git a/experimental/PdfViewer/src/SkPdfDiffEncoder.cpp b/experimental/PdfViewer/src/SkPdfDiffEncoder.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5d4c4322dc59aa94119192487cc2cab59010bf3c
--- /dev/null
+++ b/experimental/PdfViewer/src/SkPdfDiffEncoder.cpp
@@ -0,0 +1,131 @@
+/*
+ * 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 "SkPdfDiffEncoder.h"
+#include "SkPdfNativeTokenizer.h"
+
+#ifdef PDF_TRACE_DIFF_IN_PNG
+#include "SkBitmap.h"
+#include "SkBitmapDevice.h"
+#include "SkCanvas.h"
+#include "SkClipStack.h"
+#include "SkColor.h"
+#include "SkImageEncoder.h"
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkRegion.h"
+#include "SkScalar.h"
+#include "SkString.h"
+
+extern "C" SkBitmap* gDumpBitmap;
+extern "C" SkCanvas* gDumpCanvas;
+SkBitmap* gDumpBitmap = NULL;
+SkCanvas* gDumpCanvas = NULL;
+static int gReadOp;
+static int gOpCounter;
+static SkString gLastKeyword;
+#endif  // PDF_TRACE_DIFF_IN_PNG
+
+void SkPdfDiffEncoder::WriteToFile(PdfToken* token) {
+#ifdef PDF_TRACE_DIFF_IN_PNG
+    gReadOp++;
+    gOpCounter++;
+
+    // Only attempt to write if the dump bitmap and canvas are non NULL. They are set by
+    // pdf_viewer_main.cpp
+    if (NULL == gDumpBitmap || NULL == gDumpCanvas) {
+        return;
+    }
+
+    // TODO(edisonn): this code is used to make a step by step history of all the draw operations
+    // so we could find the step where something is wrong.
+    if (!gLastKeyword.isEmpty()) {
+        gDumpCanvas->flush();
+
+        // Copy the existing drawing. Then we will draw the difference caused by this command,
+        // highlighted with a blue border.
+        SkBitmap bitmap;
+        if (gDumpBitmap->copyTo(&bitmap, SkBitmap::kARGB_8888_Config)) {
+
+            SkAutoTUnref<SkBaseDevice> device(SkNEW_ARGS(SkBitmapDevice, (bitmap)));
+            SkCanvas canvas(device);
+
+            // draw context stuff here
+            SkPaint blueBorder;
+            blueBorder.setColor(SK_ColorBLUE);
+            blueBorder.setStyle(SkPaint::kStroke_Style);
+            blueBorder.setTextSize(SkDoubleToScalar(20));
+
+            SkString str;
+
+            const SkClipStack* clipStack = gDumpCanvas->getClipStack();
+            if (clipStack) {
+                SkClipStack::Iter iter(*clipStack, SkClipStack::Iter::kBottom_IterStart);
+                const SkClipStack::Element* elem;
+                double y = 0;
+                int total = 0;
+                while ((elem = iter.next()) != NULL) {
+                    total++;
+                    y += 30;
+
+                    switch (elem->getType()) {
+                        case SkClipStack::Element::kRect_Type:
+                            canvas.drawRect(elem->getRect(), blueBorder);
+                            canvas.drawText("Rect Clip", strlen("Rect Clip"),
+                                            SkDoubleToScalar(10), SkDoubleToScalar(y), blueBorder);
+                            break;
+                        case SkClipStack::Element::kPath_Type:
+                            canvas.drawPath(elem->getPath(), blueBorder);
+                            canvas.drawText("Path Clip", strlen("Path Clip"),
+                                            SkDoubleToScalar(10), SkDoubleToScalar(y), blueBorder);
+                            break;
+                        case SkClipStack::Element::kEmpty_Type:
+                            canvas.drawText("Empty Clip!!!", strlen("Empty Clip!!!"),
+                                            SkDoubleToScalar(10), SkDoubleToScalar(y), blueBorder);
+                            break;
+                        default:
+                            canvas.drawText("Unknown Clip!!!", strlen("Unknown Clip!!!"),
+                                            SkDoubleToScalar(10), SkDoubleToScalar(y), blueBorder);
+                            break;
+                    }
+                }
+
+                y += 30;
+                str.printf("Number of clips in stack: %i", total);
+                canvas.drawText(str.c_str(), str.size(),
+                                SkDoubleToScalar(10), SkDoubleToScalar(y), blueBorder);
+            }
+
+            const SkRegion& clipRegion = gDumpCanvas->getTotalClip();
+            SkPath clipPath;
+            if (clipRegion.getBoundaryPath(&clipPath)) {
+                SkPaint redBorder;
+                redBorder.setColor(SK_ColorRED);
+                redBorder.setStyle(SkPaint::kStroke_Style);
+                canvas.drawPath(clipPath, redBorder);
+            }
+
+            canvas.flush();
+
+            SkString out;
+
+            // TODO(edisonn): overlay on top of image inf about the clip , grafic state, the stack
+
+            out.appendf("/tmp/log_step_by_step/step-%i-%s.png", gOpCounter, gLastKeyword.c_str());
+
+            SkImageEncoder::EncodeFile(out.c_str(), bitmap, SkImageEncoder::kPNG_Type, 100);
+        }
+    }
+
+    if (token->fType == kKeyword_TokenType && token->fKeyword && token->fKeywordLength > 0) {
+        gLastKeyword.set(token->fKeyword, token->fKeywordLength);
+    } else {
+        gLastKeyword.reset();
+    }
+#endif
+}
+