privatize SkScan.h

git-svn-id: http://skia.googlecode.com/svn/trunk@5038 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 138 insertions, 0 deletions

diff --git a/src/core/SkScan.h b/src/core/SkScan.h
new file mode 100644
index 0000000000..61ba1b0d55
--- /dev/null
+++ b/src/core/SkScan.h
@@ -0,0 +1,138 @@
+
+/*
+ * Copyright 2011 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkScan_DEFINED
+#define SkScan_DEFINED
+
+#include "SkRect.h"
+
+class SkRasterClip;
+class SkRegion;
+class SkBlitter;
+class SkPath;
+
+/** Defines a fixed-point rectangle, identical to the integer SkIRect, but its
+    coordinates are treated as SkFixed rather than int32_t.
+*/
+typedef SkIRect SkXRect;
+
+class SkScan {
+public:
+    static void FillPath(const SkPath&, const SkIRect&, SkBlitter*);
+
+    ///////////////////////////////////////////////////////////////////////////
+    // rasterclip
+
+    static void FillIRect(const SkIRect&, const SkRasterClip&, SkBlitter*);
+    static void FillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*);
+#ifdef SK_SCALAR_IS_FIXED
+    static void FillRect(const SkRect& rect, const SkRasterClip& clip,
+                         SkBlitter* blitter) {
+        SkScan::FillXRect(*(const SkXRect*)&rect, clip, blitter);
+    }
+    static void AntiFillRect(const SkRect& rect, const SkRasterClip& clip,
+                             SkBlitter* blitter) {
+        SkScan::AntiFillXRect(*(const SkXRect*)&rect, clip, blitter);
+    }
+#else
+    static void FillRect(const SkRect&, const SkRasterClip&, SkBlitter*);
+    static void AntiFillRect(const SkRect&, const SkRasterClip&, SkBlitter*);
+#endif
+    static void AntiFillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*);
+    static void FillPath(const SkPath&, const SkRasterClip&, SkBlitter*);
+    static void AntiFillPath(const SkPath&, const SkRasterClip&, SkBlitter*);
+    static void FrameRect(const SkRect&, const SkPoint& strokeSize,
+                          const SkRasterClip&, SkBlitter*);
+    static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize,
+                              const SkRasterClip&, SkBlitter*);
+    static void FillTriangle(const SkPoint pts[], const SkRasterClip&, SkBlitter*);
+    static void HairLine(const SkPoint&, const SkPoint&, const SkRasterClip&,
+                         SkBlitter*);
+    static void AntiHairLine(const SkPoint&, const SkPoint&, const SkRasterClip&,
+                             SkBlitter*);
+    static void HairRect(const SkRect&, const SkRasterClip&, SkBlitter*);
+    static void AntiHairRect(const SkRect&, const SkRasterClip&, SkBlitter*);
+    static void HairPath(const SkPath&, const SkRasterClip&, SkBlitter*);
+    static void AntiHairPath(const SkPath&, const SkRasterClip&, SkBlitter*);
+
+private:
+    friend class SkAAClip;
+    friend class SkRegion;
+
+    static void FillIRect(const SkIRect&, const SkRegion* clip, SkBlitter*);
+    static void FillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*);
+#ifdef SK_SCALAR_IS_FIXED
+    static void FillRect(const SkRect& rect, const SkRegion* clip,
+                         SkBlitter* blitter) {
+        SkScan::FillXRect(*(const SkXRect*)&rect, clip, blitter);
+    }
+    static void AntiFillRect(const SkRect& rect, const SkRegion* clip,
+                             SkBlitter* blitter) {
+        SkScan::AntiFillXRect(*(const SkXRect*)&rect, clip, blitter);
+    }
+#else
+    static void FillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
+    static void AntiFillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
+#endif
+    static void AntiFillXRect(const SkXRect&, const SkRegion*, SkBlitter*);
+    static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
+    static void AntiFillPath(const SkPath&, const SkRegion& clip, SkBlitter*,
+                             bool forceRLE = false);
+    static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*);
+    
+    static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize,
+                              const SkRegion*, SkBlitter*);
+    static void HairLineRgn(const SkPoint&, const SkPoint&, const SkRegion*,
+                         SkBlitter*);
+    static void AntiHairLineRgn(const SkPoint&, const SkPoint&, const SkRegion*,
+                             SkBlitter*);
+};
+
+/** Assign an SkXRect from a SkIRect, by promoting the src rect's coordinates
+    from int to SkFixed. Does not check for overflow if the src coordinates
+    exceed 32K
+*/
+static inline void XRect_set(SkXRect* xr, const SkIRect& src) {
+    xr->fLeft = SkIntToFixed(src.fLeft);
+    xr->fTop = SkIntToFixed(src.fTop);
+    xr->fRight = SkIntToFixed(src.fRight);
+    xr->fBottom = SkIntToFixed(src.fBottom);
+}
+
+/** Assign an SkXRect from a SkRect, by promoting the src rect's coordinates
+    from SkScalar to SkFixed. Does not check for overflow if the src coordinates
+    exceed 32K
+*/
+static inline void XRect_set(SkXRect* xr, const SkRect& src) {
+    xr->fLeft = SkScalarToFixed(src.fLeft);
+    xr->fTop = SkScalarToFixed(src.fTop);
+    xr->fRight = SkScalarToFixed(src.fRight);
+    xr->fBottom = SkScalarToFixed(src.fBottom);
+}
+
+/** Round the SkXRect coordinates, and store the result in the SkIRect.
+*/
+static inline void XRect_round(const SkXRect& xr, SkIRect* dst) {
+    dst->fLeft = SkFixedRound(xr.fLeft);
+    dst->fTop = SkFixedRound(xr.fTop);
+    dst->fRight = SkFixedRound(xr.fRight);
+    dst->fBottom = SkFixedRound(xr.fBottom);
+}
+
+/** Round the SkXRect coordinates out (i.e. use floor for left/top, and ceiling
+    for right/bottom), and store the result in the SkIRect.
+*/
+static inline void XRect_roundOut(const SkXRect& xr, SkIRect* dst) {
+    dst->fLeft = SkFixedFloor(xr.fLeft);
+    dst->fTop = SkFixedFloor(xr.fTop);
+    dst->fRight = SkFixedCeil(xr.fRight);
+    dst->fBottom = SkFixedCeil(xr.fBottom);
+}
+
+#endif