grab from latest android

git-svn-id: http://skia.googlecode.com/svn/trunk@27 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 123 insertions, 0 deletions

diff --git a/src/core/SkScan.h b/src/core/SkScan.h
new file mode 100644
index 0000000000..379c016b41
--- /dev/null
+++ b/src/core/SkScan.h
@@ -0,0 +1,123 @@
+/* libs/graphics/sgl/SkScan.h
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#ifndef SkScan_DEFINED
+#define SkScan_DEFINED
+
+#include "SkRect.h"
+
+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 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);
+    }
+#else
+    static void FillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
+#endif
+
+    static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*);
+    static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
+
+    static void FillTriangle(const SkPoint& a, const SkPoint& b,
+                             const SkPoint& c, const SkRegion* clip,
+                             SkBlitter* blitter) {
+        SkPoint pts[3];
+        pts[0] = a;
+        pts[1] = b;
+        pts[2] = c;
+        FillTriangle(pts, clip, blitter);
+    }
+
+    static void HairLine(const SkPoint&, const SkPoint&, const SkRegion* clip, SkBlitter*);
+    static void HairRect(const SkRect&, const SkRegion* clip, SkBlitter*);
+    static void HairPath(const SkPath&, const SkRegion* clip, SkBlitter*);
+
+    static void FrameRect(const SkRect&, SkScalar width, const SkRegion* clip, SkBlitter*);
+
+    static void AntiFillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*);
+#ifdef SK_SCALAR_IS_FIXED
+    static void AntiFillRect(const SkRect& rect, const SkRegion* clip,
+                         SkBlitter* blitter) {
+        SkScan::AntiFillXRect(*(const SkXRect*)&rect, clip, blitter);
+    }
+#else
+    static void AntiFillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
+#endif
+    
+    static void AntiFillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
+
+    static void AntiHairLine(const SkPoint&, const SkPoint&, const SkRegion* clip, SkBlitter*);
+    static void AntiHairRect(const SkRect&, const SkRegion* clip, SkBlitter*);
+    static void AntiHairPath(const SkPath&, const SkRegion* clip, 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 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 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 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 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