sw_engine: rasterization region edited in the case of fast tracking

Since no antialiasing is applied for the fastTracking cases,
the shape's rasterization region needs to be edited. To establish
the rastered bbox, the rounding is performed before the bbox corners
are casted to the SwCoords.

diff --git a/src/lib/sw_engine/tvgSwShape.cpp b/src/lib/sw_engine/tvgSwShape.cpp
index 08cd694..0d93b55 100644 (file)
--- a/src/lib/sw_engine/tvgSwShape.cpp
+++ b/src/lib/sw_engine/tvgSwShape.cpp
@@ -22,6 +22,7 @@
 #include "tvgSwCommon.h"
 #include "tvgBezier.h"
 #include <float.h>
+#include <math.h>
 
 /************************************************************************/
 /* Internal Class Implementation                                        */
@@ -508,8 +509,33 @@ bool shapeGenRle(SwShape* shape, TVG_UNUSED const Shape* sdata, bool antiAlias,
     //if (shape.outline->opened) return true;
 
     //Case A: Fast Track Rectangle Drawing
-    if (!hasComposite && (shape->rect = _fastTrack(shape->outline))) return true;
-    //Case B: Normale Shape RLE Drawing
+    if (!hasComposite && (shape->rect = _fastTrack(shape->outline))) {
+        //Since no antialiasing is applied in the Fast Track case,
+        //the rasterization region has to be modified
+        auto corner1 = shape->outline->pts;
+        auto corner3 = shape->outline->pts + 2;
+
+        auto xMin = corner1->x;
+        auto xMax = corner3->x;
+        if (xMin > xMax) {
+            xMax = xMin;
+            xMin = corner3->x;
+        }
+        auto yMin = corner1->y;
+        auto yMax = corner3->y;
+        if (yMin > yMax) {
+            yMax = yMin;
+            yMin = corner3->y;
+        }
+
+        shape->bbox.min.x = static_cast<SwCoord>(round(xMin / 64.0f));
+        shape->bbox.max.x = static_cast<SwCoord>(round(xMax / 64.0f));
+        shape->bbox.min.y = static_cast<SwCoord>(round(yMin / 64.0f));
+        shape->bbox.max.y = static_cast<SwCoord>(round(yMax / 64.0f));
+
+        return true;
+    }
+    //Case B: Normal Shape RLE Drawing
     if ((shape->rle = rleRender(shape->rle, shape->outline, shape->bbox, antiAlias))) return true;
 
     return false;