Bug 1186159 - Add an APZ minimap. r=kats

--HG--
extra : commitid : Iqp1Id5IZsI
extra : rebase_source : 47afb423bc1d96df97e54f1d23fb8f87cfe0419b

gfx/layers/Compositor.cpp

@@ -121,7 +121,6 @@ Compositor::DrawDiagnosticsInternal(DiagnosticFlags aFlags,
 #else
   int lWidth = 2;
 #endif
-  float opacity = 0.7f;
 
   gfx::Color color;
   if (aFlags & DiagnosticFlags::CONTENT) {
@@ -142,12 +141,15 @@ Compositor::DrawDiagnosticsInternal(DiagnosticFlags aFlags,
       aFlags & DiagnosticFlags::BIGIMAGE ||
       aFlags & DiagnosticFlags::REGION_RECT) {
     lWidth = 1;
-    opacity = 0.5f;
     color.r *= 0.7f;
     color.g *= 0.7f;
     color.b *= 0.7f;
+    color.a = color.a * 0.5f;
+  } else {
+    color.a = color.a * 0.7f;
   }
 
+
   if (mDiagnosticTypes & DiagnosticTypes::FLASH_BORDERS) {
     float flash = (float)aFlashCounter / (float)DIAGNOSTIC_FLASH_COUNTER_MAX;
     color.r *= flash;
@@ -155,31 +157,57 @@ Compositor::DrawDiagnosticsInternal(DiagnosticFlags aFlags,
     color.b *= flash;
   }
 
+  SlowDrawRect(aVisibleRect, color, aClipRect, aTransform, lWidth);
+}
+
+void
+Compositor::SlowDrawRect(const gfx::Rect& aRect, const gfx::Color& aColor,
+                     const gfx::Rect& aClipRect,
+                     const gfx::Matrix4x4& aTransform, int aStrokeWidth)
+{
+  // TODO This should draw a rect using a single draw call but since
+  // this is only used for debugging overlays it's not worth optimizing ATM.
+  float opacity = 1.0f;
   EffectChain effects;
 
-  effects.mPrimaryEffect = new EffectSolidColor(color);
+  effects.mPrimaryEffect = new EffectSolidColor(aColor);
   // left
-  this->DrawQuad(gfx::Rect(aVisibleRect.x, aVisibleRect.y,
-                           lWidth, aVisibleRect.height),
+  this->DrawQuad(gfx::Rect(aRect.x, aRect.y,
+                           aStrokeWidth, aRect.height),
                  aClipRect, effects, opacity,
                  aTransform);
   // top
-  this->DrawQuad(gfx::Rect(aVisibleRect.x + lWidth, aVisibleRect.y,
-                           aVisibleRect.width - 2 * lWidth, lWidth),
+  this->DrawQuad(gfx::Rect(aRect.x + aStrokeWidth, aRect.y,
+                           aRect.width - 2 * aStrokeWidth, aStrokeWidth),
                  aClipRect, effects, opacity,
                  aTransform);
   // right
-  this->DrawQuad(gfx::Rect(aVisibleRect.x + aVisibleRect.width - lWidth, aVisibleRect.y,
-                           lWidth, aVisibleRect.height),
+  this->DrawQuad(gfx::Rect(aRect.x + aRect.width - aStrokeWidth, aRect.y,
+                           aStrokeWidth, aRect.height),
                  aClipRect, effects, opacity,
                  aTransform);
   // bottom
-  this->DrawQuad(gfx::Rect(aVisibleRect.x + lWidth, aVisibleRect.y + aVisibleRect.height-lWidth,
-                           aVisibleRect.width - 2 * lWidth, lWidth),
+  this->DrawQuad(gfx::Rect(aRect.x + aStrokeWidth, aRect.y + aRect.height - aStrokeWidth,
+                           aRect.width - 2 * aStrokeWidth, aStrokeWidth),
                  aClipRect, effects, opacity,
                  aTransform);
 }
 
+void
+Compositor::FillRect(const gfx::Rect& aRect, const gfx::Color& aColor,
+                     const gfx::Rect& aClipRect,
+                     const gfx::Matrix4x4& aTransform)
+{
+  float opacity = 1.0f;
+  EffectChain effects;
+
+  effects.mPrimaryEffect = new EffectSolidColor(aColor);
+  this->DrawQuad(aRect,
+                 aClipRect, effects, opacity,
+                 aTransform);
+}
+
+
 static float
 WrapTexCoord(float v)
 {

gfx/layers/Compositor.h

@@ -320,6 +320,21 @@ public:
       DrawQuad(aRect, aClipRect, aEffectChain, aOpacity, aTransform, aRect);
   }
 
+  /**
+   * Draw an unfilled solid color rect. Typically used for debugging overlays.
+   */
+  void SlowDrawRect(const gfx::Rect& aRect, const gfx::Color& color,
+                const gfx::Rect& aClipRect = gfx::Rect(),
+                const gfx::Matrix4x4& aTransform = gfx::Matrix4x4(),
+                int aStrokeWidth = 1);
+
+  /**
+   * Draw a solid color filled rect. This is a simple DrawQuad helper.
+   */
+  void FillRect(const gfx::Rect& aRect, const gfx::Color& color,
+                    const gfx::Rect& aClipRect = gfx::Rect(),
+                    const gfx::Matrix4x4& aTransform = gfx::Matrix4x4());
+
   /*
    * Clear aRect on current render target.
    */

gfx/layers/composite/ContainerLayerComposite.cpp

@@ -329,6 +329,86 @@ ContainerPrepare(ContainerT* aContainer,
   }
 }
 
+template<class ContainerT> void
+RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
+                   const RenderTargetIntRect& aClipRect, Layer* aLayer)
+{
+  Compositor* compositor = aManager->GetCompositor();
+
+  if (aLayer->GetFrameMetricsCount() < 1) {
+    return;
+  }
+
+  AsyncPanZoomController* controller = aLayer->GetAsyncPanZoomController(0);
+  if (!controller) {
+    return;
+  }
+
+  ViewTransform asyncTransformWithoutOverscroll;
+  ParentLayerPoint scrollOffset;
+  controller->SampleContentTransformForFrame(&asyncTransformWithoutOverscroll,
+                                           scrollOffset);
+
+  // Options
+  const int verticalPadding = 10;
+  const int horizontalPadding = 5;
+  gfx::Color backgroundColor(0.3f, 0.3f, 0.3f, 0.3f);
+  gfx::Color tileActiveColor(1, 1, 1, 0.5f);
+  gfx::Color tileBorderColor(0, 0, 0, 0.1f);
+  gfx::Color pageBorderColor(0, 0, 0);
+  gfx::Color displayPortColor(0, 1.f, 0);
+  gfx::Color viewPortColor(0, 0, 1.f);
+
+  // Rects
+  const FrameMetrics& fm = aLayer->GetFrameMetrics(0);
+  LayerRect scrollRect = fm.GetScrollableRect() * fm.LayersPixelsPerCSSPixel();
+  LayerRect viewRect = ParentLayerRect(scrollOffset, fm.GetCompositionBounds().Size()) / LayerToParentLayerScale(1);
+  LayerRect dp = (fm.GetDisplayPort() + fm.GetScrollOffset()) * fm.LayersPixelsPerCSSPixel();
+
+  // Compute a scale with an appropriate aspect ratio
+  // We allocate up to 100px of width and the height of this layer.
+  float scaleFactor;
+  float scaleFactorX;
+  float scaleFactorY;
+  scaleFactorX = 100.f / scrollRect.width;
+  scaleFactorY = ((viewRect.height) - 2 * verticalPadding) / scrollRect.height;
+  scaleFactor = std::min(scaleFactorX, scaleFactorY);
+
+  Matrix4x4 transform = Matrix4x4::Scaling(scaleFactor, scaleFactor, 1);
+  transform.PostTranslate(horizontalPadding, verticalPadding, 0);
+
+  Rect clipRect = aContainer->GetEffectiveTransform().TransformBounds(
+                    transform.TransformBounds(scrollRect.ToUnknownRect()));
+  clipRect.width++;
+  clipRect.height++;
+
+  Rect r;
+  r = transform.TransformBounds(scrollRect.ToUnknownRect());
+  compositor->FillRect(r, backgroundColor, clipRect, aContainer->GetEffectiveTransform());
+
+  int tileW = gfxPrefs::LayersTileWidth();
+  int tileH = gfxPrefs::LayersTileHeight();
+
+  for (int x = scrollRect.x; x < scrollRect.XMost(); x += tileW) {
+    for (int y = scrollRect.y; y < scrollRect.YMost(); y += tileH) {
+      LayerRect tileRect = LayerRect(x - x % tileW, y - y % tileH, tileW, tileH);
+      r = transform.TransformBounds(tileRect.ToUnknownRect());
+      if (tileRect.Intersects(dp)) {
+        compositor->FillRect(r, tileActiveColor, clipRect, aContainer->GetEffectiveTransform());
+      }
+      compositor->SlowDrawRect(r, tileBorderColor, clipRect, aContainer->GetEffectiveTransform());
+    }
+  }
+
+  r = transform.TransformBounds(scrollRect.ToUnknownRect());
+  compositor->SlowDrawRect(r, pageBorderColor, clipRect, aContainer->GetEffectiveTransform());
+  r = transform.TransformBounds(dp.ToUnknownRect());
+  compositor->SlowDrawRect(r, displayPortColor, clipRect, aContainer->GetEffectiveTransform());
+  r = transform.TransformBounds(viewRect.ToUnknownRect());
+  compositor->SlowDrawRect(r, viewPortColor, clipRect, aContainer->GetEffectiveTransform());
+}
+
+
 template<class ContainerT> void
 RenderLayers(ContainerT* aContainer,
 	     LayerManagerComposite* aManager,
@@ -407,6 +487,10 @@ RenderLayers(ContainerT* aContainer,
       }
     }
 
+    if (gfxPrefs::APZMinimap()) {
+      RenderMinimap(aContainer, aManager, aClipRect, layer);
+    }
+
     // invariant: our GL context should be current here, I don't think we can
     // assert it though
   }

gfx/layers/composite/ContainerLayerComposite.h

@@ -50,6 +50,9 @@ class ContainerLayerComposite : public ContainerLayer,
                         LayerManagerComposite* aManager,
                         const RenderTargetIntRect& aClipRect);
 
+  template<class ContainerT>
+  void RenderMinimap(ContainerT* aContainer, LayerManagerComposite* aManager,
+                     const RenderTargetIntRect& aClipRect, Layer* aLayer);
 public:
   explicit ContainerLayerComposite(LayerManagerComposite *aManager);
 

gfx/thebes/gfxPrefs.h

@@ -163,6 +163,7 @@ private:
   DECL_GFX_PREF(Once, "apz.max_velocity_inches_per_ms",        APZMaxVelocity, float, -1.0f);
   DECL_GFX_PREF(Once, "apz.max_velocity_queue_size",           APZMaxVelocityQueueSize, uint32_t, 5);
   DECL_GFX_PREF(Live, "apz.min_skate_speed",                   APZMinSkateSpeed, float, 1.0f);
+  DECL_GFX_PREF(Live, "apz.minimap.enabled",                   APZMinimap, bool, false);
   DECL_GFX_PREF(Live, "apz.num_paint_duration_samples",        APZNumPaintDurationSamples, int32_t, 3);
   DECL_GFX_PREF(Live, "apz.overscroll.enabled",                APZOverscrollEnabled, bool, false);
   DECL_GFX_PREF(Live, "apz.overscroll.min_pan_distance_ratio", APZMinPanDistanceRatio, float, 1.0f);

modules/libpref/init/all.js

@@ -548,6 +548,7 @@ pref("apz.fling_stopped_threshold", "0.01");
 pref("apz.max_velocity_inches_per_ms", "-1.0");
 pref("apz.max_velocity_queue_size", 5);
 pref("apz.min_skate_speed", "1.0");
+pref("apz.minimap.enabled", false);
 pref("apz.num_paint_duration_samples", 3);
 pref("apz.overscroll.enabled", false);
 pref("apz.overscroll.min_pan_distance_ratio", "1.0");