pdfviewer: All NulCanvas (does not draw operations), TrackDevice (trackes what pixels have been changed)
Review URL: https://codereview.chromium.org/19793006
git-svn-id: http://skia.googlecode.com/svn/trunk@10236 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/PdfViewer/SkTracker.h b/experimental/PdfViewer/SkTracker.h
new file mode 100644
index 0000000..3b02964
--- /dev/null
+++ b/experimental/PdfViewer/SkTracker.h
@@ -0,0 +1,174 @@
+#ifndef EXPERIMENTAL_PDFVIEWER_SKTRACKER_H_
+#define EXPERIMENTAL_PDFVIEWER_SKTRACKER_H_
+
+#include "SkBitmap.h"
+#include "SkPoint.h"
+
+#define MAX_TRACKING_POINTS 100
+
+class SkTracker {
+public:
+ SkTracker() : fEnabled(false)
+ , fBreakOnAny(false)
+ , fCntExpectedTouched(0)
+ , fCntExpectedUntouched(0)
+ , fHits(0) {}
+
+ virtual ~SkTracker() {}
+
+ void clearPoints() {
+ fCntExpectedTouched = 0;
+ fCntExpectedUntouched = 0;
+ }
+
+ void enableTracking(bool b) {
+ fEnabled = b;
+ }
+
+ bool trackingEnabled() {
+ return fEnabled;
+ }
+
+ void any() {
+ fBreakOnAny = true;
+ }
+
+ void all() {
+ fBreakOnAny = false;
+ }
+
+ bool requireAllExpectedTouched() {
+ return !fBreakOnAny;
+ }
+
+ int cntExpectedTouched() {
+ return fCntExpectedTouched;
+ }
+
+ const SkIPoint* expectedTouched() {
+ return fExpectedTouched;
+ }
+
+ int cntExpectedUntouched() {
+ return fCntExpectedUntouched;
+ }
+
+ const SkIPoint* expectedUntouched() {
+ return fExpectedUntouched;
+ }
+
+ bool addExpectTouch(int x, int y) {
+ if (fCntExpectedTouched >= MAX_TRACKING_POINTS) {
+ return false;
+ }
+ if (found(x, y)) {
+ return false;
+ }
+ fExpectedTouched[fCntExpectedTouched] = SkIPoint::Make(x, y);
+ fCntExpectedTouched++;
+ return true;
+ }
+
+ bool addExpectUntouch(int x, int y) {
+ if (fCntExpectedUntouched >= MAX_TRACKING_POINTS) {
+ return false;
+ }
+ if (found(x, y)) {
+ return false;
+ }
+ fExpectedUntouched[fCntExpectedUntouched] = SkIPoint::Make(x, y);
+ fCntExpectedUntouched++;
+ return true;
+ }
+
+ void newFrame() {
+ fHits = 0;
+ }
+
+ int hits() {
+ return fHits;
+ }
+
+ void before(const SkBitmap& bitmap) {
+ if (fCntExpectedTouched == 0) {
+ return;
+ }
+
+ for (int i = 0 ; i < fCntExpectedTouched; i++) {
+ fBeforeTouched[i] = pickColor(bitmap, fExpectedTouched[i].x(), fExpectedTouched[i].y());
+ }
+ for (int i = 0 ; i < fCntExpectedUntouched; i++) {
+ fBeforeUntouched[i] = pickColor(bitmap, fExpectedUntouched[i].x(), fExpectedUntouched[i].y());
+ }
+ }
+
+ // any/all of the expected touched has to be changed, and all expected untouched must be intact
+ void after(const SkBitmap& bitmap) {
+ if (fCntExpectedTouched == 0) {
+ return;
+ }
+
+ bool doBreak;
+ if (fBreakOnAny) {
+ doBreak = false;
+ for (int i = 0 ; i < fCntExpectedTouched; i++) {
+ doBreak = doBreak || fBeforeTouched[i] != pickColor(bitmap, fExpectedTouched[i].x(), fExpectedTouched[i].y());
+ }
+ } else {
+ doBreak = true;
+ for (int i = 0 ; i < fCntExpectedTouched; i++) {
+ doBreak = doBreak && fBeforeTouched[i] != pickColor(bitmap, fExpectedTouched[i].x(), fExpectedTouched[i].y());
+ }
+ }
+
+ for (int i = 0 ; i < fCntExpectedUntouched; i++) {
+ doBreak = doBreak && fBeforeUntouched[i] == pickColor(bitmap, fExpectedUntouched[i].x(), fExpectedUntouched[i].y());
+ }
+
+ if (doBreak) {
+ fHits++;
+ if (fEnabled) {
+ breakExecution();
+ }
+ }
+ }
+
+private:
+ inline SkColor pickColor(const SkBitmap& bitmap, int x, int y) {
+ return bitmap.getColor(x, y);
+ }
+
+ void breakExecution() {
+ printf("break;\n");
+ }
+
+ inline bool found(int x, int y) {
+ for (int i = 0 ; i < fCntExpectedTouched; i++) {
+ if (x == fExpectedTouched[i].x() && y == fExpectedTouched[i].y()) {
+ return true;
+ }
+ }
+ for (int i = 0 ; i < fCntExpectedUntouched; i++) {
+ if (x == fExpectedUntouched[i].x() && y == fExpectedUntouched[i].y()) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+
+ bool fEnabled;
+ // break on any change on expected touched or all.
+ bool fBreakOnAny;
+ SkIPoint fExpectedTouched[MAX_TRACKING_POINTS];
+ SkColor fBeforeTouched[MAX_TRACKING_POINTS];
+ int fCntExpectedTouched;
+
+ SkIPoint fExpectedUntouched[MAX_TRACKING_POINTS];
+ SkColor fBeforeUntouched[MAX_TRACKING_POINTS];
+ int fCntExpectedUntouched;
+
+ int fHits;
+};
+
+#endif // EXPERIMENTAL_PDFVIEWER_SKTRACKER_H_