Restructuring of PdfViewer code.

experimental/PdfViewer/src/SkPdfTokenLooper.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 "SkPdfTokenLooper.h"
+#include "SkPdfNativeTokenizer.h"
+#include "SkBitmap.h"
+
+#ifdef PDF_TRACE_DIFF_IN_PNG
+#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"
+#endif  // PDF_TRACE_DIFF_IN_PNG
+
+// FIXME (scroggo): Put behind build flags.
+extern "C" SkBitmap* gDumpBitmap;
+extern "C" SkCanvas* gDumpCanvas;
+SkBitmap* gDumpBitmap = NULL;
+SkCanvas* gDumpCanvas = NULL;
+int gReadOp;
+int gLastOpKeyword;
+char gLastKeyword[100] = "";
+
+#ifdef PDF_TRACE_DIFF_IN_PNG
+// FIXME (scroggo): allOpWithVisualEffects can be local to hasVisualEffect.
+char allOpWithVisualEffects[100] = ",S,s,f,F,f*,B,B*,b,b*,n,Tj,TJ,\',\",d0,d1,sh,EI,Do,EX,";
+// FIXME (scroggo): has_visual_effect
+static bool hasVisualEffect(const char* pdfOp) {
+    return true;
+    if (*pdfOp == '\0') return false;
+
+    char markedPdfOp[100] = ",";
+    strcat(markedPdfOp, pdfOp);
+    strcat(markedPdfOp, ",");
+
+    return (strstr(allOpWithVisualEffects, markedPdfOp) != NULL);
+}
+
+static void setup_bitmap(SkBitmap* bitmap, int width, int height) {
+    bitmap->setConfig(SkBitmap::kARGB_8888_Config, width, height);
+
+    bitmap->allocPixels();
+    bitmap->eraseColor(SK_ColorWHITE);
+}
+
+#endif  // PDF_TRACE_DIFF_IN_PNG
+
+// FIXME (scroggo): fTokenizer -> tokenizer.
+bool readToken(SkPdfNativeTokenizer* fTokenizer, PdfToken* token) {
+    bool ret = fTokenizer->readToken(token);
+
+    gReadOp++;
+    gLastOpKeyword++;
+#ifdef PDF_TRACE_DIFF_IN_PNG
+    // 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[0] && hasVisualEffect(gLastKeyword)) {
+        gDumpCanvas->flush();
+
+        // FIXME (scroggo): Could use SkSurface/SkImage?
+        SkBitmap bitmap;
+        setup_bitmap(&bitmap, gDumpBitmap->width(), gDumpBitmap->height());
+
+        memcpy(bitmap.getPixels(), gDumpBitmap->getPixels(), gDumpBitmap->getSize());
+
+        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("Unkown Clip!!!", strlen("Unkown 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",
+                    gLastOpKeyword, gLastKeyword);
+        SkImageEncoder::EncodeFile(out.c_str(), bitmap, SkImageEncoder::kPNG_Type, 100);
+    }
+
+    if (ret && token->fType == kKeyword_TokenType &&
+            token->fKeyword && token->fKeywordLength > 0 && token->fKeywordLength < 100) {
+        strncpy(gLastKeyword, token->fKeyword, token->fKeywordLength);
+        gLastKeyword[token->fKeywordLength] = '\0';
+    } else {
+        gLastKeyword[0] = '\0';
+    }
+#endif
+
+    return ret;
+}
+