SkHitBox added.
SkHitBox is a class that determines which draw command is associated with the pixel located at x,y. By calculating a single point instead of the entire bitmap at once there is no visible performance slowdown.
Review URL: https://codereview.appspot.com/6350098
git-svn-id: http://skia.googlecode.com/svn/trunk@4565 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/debugger/SkHitBox.cpp b/debugger/SkHitBox.cpp
new file mode 100644
index 0000000..a65fcc4
--- /dev/null
+++ b/debugger/SkHitBox.cpp
@@ -0,0 +1,66 @@
+
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#include "SkHitBox.h"
+
+SkHitBox::SkHitBox() {
+ fHitBox = NULL;
+ fX = -1;
+ fY = -1;
+ fLayer = -1;
+}
+
+SkHitBox::~SkHitBox() {}
+
+void SkHitBox::alloc(int width, int height) {
+ free(fHitBox);
+ int length = width * height;
+ fHitBox = (int*) malloc(length * sizeof(int));
+ for (int i = 0; i < length; i++) {
+ fHitBox[i] = 0;
+ }
+}
+
+void SkHitBox::updateHitBox(SkBitmap* newBitmap, int layer) {
+ int length = fPrev.width() * fPrev.height();
+ int* prevBase = (int*)fPrev.getPixels();
+ int* currBase = (int*)newBitmap->getPixels();
+
+ for (int i = 0; i < length; i++) {
+ if (SkUnPreMultiply::PMColorToColor(prevBase[i]) !=
+ SkUnPreMultiply::PMColorToColor(currBase[i])) {
+ fHitBox[i] = layer;
+ }
+ }
+ if (fPrev.empty()) {
+ alloc(newBitmap->width(), newBitmap->height());
+ fPrev.setConfig(SkBitmap::kARGB_8888_Config, newBitmap->width(), newBitmap->height());
+ fPrev.allocPixels();
+ }
+ newBitmap->deepCopyTo(&fPrev, SkBitmap::kARGB_8888_Config);
+}
+
+void SkHitBox::updateHitPoint(SkBitmap* newBitmap, int layer) {
+ int* prevBase = (int*)fPrev.getPixels();
+ int* currBase = (int*)newBitmap->getPixels();
+ int pixel = fY * fPrev.width() + fX;
+
+ if (pointIsSet() && !fPrev.empty()) {
+ if (SkUnPreMultiply::PMColorToColor(prevBase[pixel]) !=
+ SkUnPreMultiply::PMColorToColor(currBase[pixel])) {
+ fLayer = layer;
+ }
+ }
+ if (fPrev.empty()) {
+ alloc(newBitmap->width(), newBitmap->height());
+ fPrev.setConfig(SkBitmap::kARGB_8888_Config, newBitmap->width(), newBitmap->height());
+ fPrev.allocPixels();
+ }
+ newBitmap->deepCopyTo(&fPrev, SkBitmap::kARGB_8888_Config);
+}