Add overdraw debugging that accounts for Deuteranomaly

Change-Id: I31f68a07aa7cf0490d2572e24e4c5ac2066a1151

4 files changed, 52 insertions, 9 deletions

diff --git a/libs/hwui/Caches.cpp b/libs/hwui/Caches.cpp
index c0b3bfc..f8d3589 100644
--- a/libs/hwui/Caches.cpp
+++ b/libs/hwui/Caches.cpp
@@ -166,11 +166,16 @@ bool Caches::initProperties() {
         debugLayersUpdates = false;
     }
 
+    debugOverdraw = false;
     if (property_get(PROPERTY_DEBUG_OVERDRAW, property, NULL) > 0) {
         INIT_LOGD("  Overdraw debug enabled: %s", property);
-        debugOverdraw = !strcmp(property, "show");
-    } else {
-        debugOverdraw = false;
+        if (!strcmp(property, "show")) {
+            debugOverdraw = true;
+            mOverdrawDebugColorSet = kColorSet_Default;
+        } else if (!strcmp(property, "show_deuteranomaly")) {
+            debugOverdraw = true;
+            mOverdrawDebugColorSet = kColorSet_Deuteranomaly;
+        }
     }
 
     // See Properties.h for valid values
@@ -235,6 +240,16 @@ void Caches::terminate() {
 // Debug
 ///////////////////////////////////////////////////////////////////////////////
 
+uint32_t Caches::getOverdrawColor(uint32_t amount) const {
+    static uint32_t sOverdrawColors[2][4] = {
+            { 0x2f0000ff, 0x2f00ff00, 0x3fff0000, 0x7fff0000 },
+            { 0x2f0000ff, 0x4fffff00, 0x5fff8ad8, 0x7fff0000 }
+    };
+    if (amount < 1) amount = 1;
+    if (amount > 4) amount = 4;
+    return sOverdrawColors[mOverdrawDebugColorSet][amount - 1];
+}
+
 void Caches::dumpMemoryUsage() {
     String8 stringLog;
     dumpMemoryUsage(stringLog);
diff --git a/libs/hwui/Caches.h b/libs/hwui/Caches.h
index f8b1e17..282aee9 100644
--- a/libs/hwui/Caches.h
+++ b/libs/hwui/Caches.h
@@ -150,6 +150,12 @@ public:
     }
 
     /**
+     * Returns a non-premultiplied ARGB color for the specified
+     * amount of overdraw (1 for 1x, 2 for 2x, etc.)
+     */
+    uint32_t getOverdrawColor(uint32_t amount) const;
+
+    /**
      * Call this on each frame to ensure that garbage is deleted from
      * GPU memory.
      */
@@ -348,6 +354,11 @@ public:
     PFNGLGETOBJECTLABELEXTPROC getLabel;
 
 private:
+    enum OverdrawColorSet {
+        kColorSet_Default = 0,
+        kColorSet_Deuteranomaly
+    };
+
     void initFont();
     void initExtensions();
     void initConstraints();
@@ -400,6 +411,8 @@ private:
     uint32_t mFunctorsCount;
 
     GLuint mBoundTextures[REQUIRED_TEXTURE_UNITS_COUNT];
+
+    OverdrawColorSet mOverdrawDebugColorSet;
 }; // class Caches
 
 }; // namespace uirenderer
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index 707f662..f2352bb 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -530,14 +530,22 @@ void OpenGLRenderer::renderOverdraw() {
         mCaches.setScissor(clip->left, mFirstSnapshot->height - clip->bottom,
                 clip->right - clip->left, clip->bottom - clip->top);
 
+        // 1x overdraw
         mCaches.stencil.enableDebugTest(2);
-        drawColor(0x2f0000ff, SkXfermode::kSrcOver_Mode);
+        drawColor(mCaches.getOverdrawColor(1), SkXfermode::kSrcOver_Mode);
+
+        // 2x overdraw
         mCaches.stencil.enableDebugTest(3);
-        drawColor(0x2f00ff00, SkXfermode::kSrcOver_Mode);
+        drawColor(mCaches.getOverdrawColor(2), SkXfermode::kSrcOver_Mode);
+
+        // 3x overdraw
         mCaches.stencil.enableDebugTest(4);
-        drawColor(0x3fff0000, SkXfermode::kSrcOver_Mode);
+        drawColor(mCaches.getOverdrawColor(3), SkXfermode::kSrcOver_Mode);
+
+        // 4x overdraw and higher
         mCaches.stencil.enableDebugTest(4, true);
-        drawColor(0x7fff0000, SkXfermode::kSrcOver_Mode);
+        drawColor(mCaches.getOverdrawColor(4), SkXfermode::kSrcOver_Mode);
+
         mCaches.stencil.disable();
     }
 }
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index 86b0aa2..20b8f2f 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -70,8 +70,15 @@ enum DebugLevel {
 #define PROPERTY_DEBUG_LAYERS_UPDATES "debug.hwui.show_layers_updates"
 
 /**
- * Used to enable/disable overdraw debugging. The accepted values are
- * "show", "count" and "false". The default value is "false".
+ * Used to enable/disable overdraw debugging.
+ *
+ * The accepted values are
+ * "show", to show overdraw
+ * "show_deuteranomaly", to show overdraw if you suffer from Deuteranomaly
+ * "count", to show an overdraw counter
+ * "false", to disable overdraw debugging
+ *
+ * The default value is "false".
  */
 #define PROPERTY_DEBUG_OVERDRAW "debug.hwui.overdraw"