Add extra options to show brush preview with Eraser/Blur/etc. tools

Feature request: https://community.aseprite.org/t/6427

data/pref.xml

@@ -28,6 +28,8 @@
       <value id="NONE" value="0" />
       <value id="EDGES" value="1" />
       <value id="FULL" value="2" />
+      <value id="FULLALL" value="3" />
+      <value id="FULLNEDGES" value="4" />
     </enum>
     <enum id="BgType">
       <value id="CHECKED_16x16" value="0" />

data/strings/en.ini

@@ -1177,8 +1177,10 @@ simple_crosshair = Simple Crosshair
 crosshair_on_sprite = Crosshair on Sprite
 brush_preview = Brush Preview:
 brush_preview_none = None
-brush_preview_edges = Brush Edges
+brush_preview_edges = Edges Only
-brush_preview_full = Full Real-time Brush Preview
+brush_preview_full = Full Preview
+brush_preview_fullall = Full Preview with All Tools
+brush_preview_fullnedges = Full Preview and Edges
 cursor_color_type = Crosshair && Brush Edges Color:
 cursor_neg_bw = Negative Black and White
 cursor_specific_color = Specific Color

data/widgets/options.xml

@@ -292,6 +292,8 @@
               <listitem text="@.brush_preview_none" value="0" />
               <listitem text="@.brush_preview_edges" value="1" />
               <listitem text="@.brush_preview_full" value="2" />
+              <listitem text="@.brush_preview_fullall" value="3" />
+              <listitem text="@.brush_preview_fullnedges" value="4" />
             </combobox>
 
 	    <label text="@.cursor_color_type" />

src/app/ui/editor/brush_preview.cpp

@@ -149,7 +149,7 @@ void BrushPreview::show(const gfx::Point& screenPos)
      (ink->isEffect()) ||
      // or when the brush color is transparent and we are not in the background layer
      (!ink->isShading() &&
-      (layer && !layer->isBackground()) &&
+      (layer && layer->isTransparent()) &&
       ((sprite->pixelFormat() == IMAGE_INDEXED && brush_color == mask_index) ||
        (sprite->pixelFormat() == IMAGE_RGB && rgba_geta(brush_color) == 0) ||
        (sprite->pixelFormat() == IMAGE_GRAYSCALE && graya_geta(brush_color) == 0))))) {
@@ -160,6 +160,8 @@ void BrushPreview::show(const gfx::Point& screenPos)
   }
 
   bool showPreview = false;
+  bool showPreviewWithEdges = false;
+  bool cancelEdges = false;
   auto brushPreview = pref.cursor.brushPreview();
   if (!m_editor->docPref().show.brushPreview())
     brushPreview = app::gen::BrushPreview::NONE;
@@ -172,7 +174,18 @@ void BrushPreview::show(const gfx::Point& screenPos)
       m_type = BRUSH_BOUNDARIES;
       break;
     case app::gen::BrushPreview::FULL:
+    case app::gen::BrushPreview::FULLALL:
+    case app::gen::BrushPreview::FULLNEDGES:
       showPreview = m_editor->getState()->requireBrushPreview();
+      switch (brushPreview) {
+        case app::gen::BrushPreview::FULLALL:
+          m_type = CROSSHAIR;
+          cancelEdges = true;
+          break;
+        case app::gen::BrushPreview::FULLNEDGES:
+          showPreviewWithEdges = true;
+          break;
+      }
       break;
   }
 
@@ -183,6 +196,8 @@ void BrushPreview::show(const gfx::Point& screenPos)
   // layer) we don't show the brush preview temporally.
   if (showPreview && m_editor->isExtraCelLocked()) {
     showPreview = false;
+    showPreviewWithEdges = false;
+    cancelEdges = false;
     m_type |= BRUSH_BOUNDARIES;
   }
 
@@ -195,9 +210,12 @@ void BrushPreview::show(const gfx::Point& screenPos)
   // For cursor type 'bounds' we have to generate cursor boundaries
   if (m_type & BRUSH_BOUNDARIES) {
     if (brush->type() != kImageBrushType)
-      showPreview = false;
+      showPreview = showPreviewWithEdges;
-    generateBoundaries();
+    if (cancelEdges)
+      m_type &= ~BRUSH_BOUNDARIES;
   }
+  if (m_type & BRUSH_BOUNDARIES)
+    generateBoundaries();
 
   // Draw pixel/brush preview
   if (showPreview) {