From 599445130cbb6c4ed6ded7a01c8d9dafef7ace47 Mon Sep 17 00:00:00 2001
From: "tomhudson@google.com"
 <tomhudson@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Date: Tue, 20 Mar 2012 21:18:43 +0000
Subject: Move SkClampRange into src/effects, where it isn't being advertised
 as something for end-users.

http://codereview.appspot.com/5864044/



git-svn-id: http://skia.googlecode.com/svn/trunk@3445 2bbb7eff-a529-9590-31e7-b0007b416f81
---
 src/core/SkClampRange.cpp | 166 ----------------------------------------------
 1 file changed, 166 deletions(-)
 delete mode 100644 src/core/SkClampRange.cpp

(limited to 'src/core')

diff --git a/src/core/SkClampRange.cpp b/src/core/SkClampRange.cpp
deleted file mode 100644
index 1f7cce355b..0000000000
--- a/src/core/SkClampRange.cpp
+++ /dev/null
@@ -1,166 +0,0 @@
-
-/*
- * Copyright 2011 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-
-#include "SkClampRange.h"
-
-/*
- *  returns [0..count] for the number of steps (<= count) for which x0 <= edge
- *  given each step is followed by x0 += dx
- */
-static int chop(int64_t x0, SkFixed edge, int64_t x1, int64_t dx, int count) {
-    SkASSERT(dx > 0);
-    SkASSERT(count >= 0);
-
-    if (x0 >= edge) {
-        return 0;
-    }
-    if (x1 <= edge) {
-        return count;
-    }
-    int64_t n = (edge - x0 + dx - 1) / dx;
-    SkASSERT(n >= 0);
-    SkASSERT(n <= count);
-    return (int)n;
-}
-
-static bool overflows_fixed(int64_t x) {
-    return x < -SK_FixedMax || x > SK_FixedMax;
-}
-
-void SkClampRange::initFor1(SkFixed fx) {
-    fCount0 = fCount1 = fCount2 = 0;
-    if (fx <= 0) {
-        fCount0 = 1;
-    } else if (fx < 0xFFFF) {
-        fCount1 = 1;
-        fFx1 = fx;
-    } else {
-        fCount2 = 1;
-    }
-}
-
-void SkClampRange::init(SkFixed fx0, SkFixed dx0, int count, int v0, int v1) {
-    SkASSERT(count > 0);
-
-    fV0 = v0;
-    fV1 = v1;
-    fOverflowed = false;
-
-    // special case 1 == count, as it is slightly common for skia
-    // and avoids us ever calling divide or 64bit multiply
-    if (1 == count) {
-        this->initFor1(fx0);
-        return;
-    }
-
-    int64_t fx = fx0;
-    int64_t dx = dx0;
-    // start with ex equal to the last computed value
-    int64_t ex = fx + (count - 1) * dx;
-    fOverflowed = overflows_fixed(ex);
-
-    if ((uint64_t)(fx | ex) <= 0xFFFF) {
-        fCount0 = fCount2 = 0;
-        fCount1 = count;
-        fFx1 = fx0;
-        return;
-    }
-    if (fx <= 0 && ex <= 0) {
-        fCount1 = fCount2 = 0;
-        fCount0 = count;
-        return;
-    }
-    if (fx >= 0xFFFF && ex >= 0xFFFF) {
-        fCount0 = fCount1 = 0;
-        fCount2 = count;
-        return;
-    }
-
-    int extraCount = 0;
-
-    // now make ex be 1 past the last computed value
-    ex += dx;
-    fOverflowed = overflows_fixed(ex);
-    // now check for over/under flow
-    if (fOverflowed) {
-        int originalCount = count;
-        int64_t ccount;
-        bool swap = dx < 0;
-        if (swap) {
-            dx = -dx;
-            fx = -fx;
-        }
-        ccount = (SK_FixedMax - fx + dx - 1) / dx;
-        if (swap) {
-            dx = -dx;
-            fx = -fx;
-        }
-        SkASSERT(ccount > 0 && ccount <= SK_FixedMax);
-
-        count = (int)ccount;
-        if (0 == count) {
-            this->initFor1(fx0);
-            if (dx > 0) {
-                fCount2 += originalCount - 1;
-            } else {
-                fCount0 += originalCount - 1;
-            }
-            return;
-        }
-        extraCount = originalCount - count;
-        ex = fx + dx * count;
-    }
-    
-    bool doSwap = dx < 0;
-
-    if (doSwap) {
-        ex -= dx;
-        fx -= dx;
-        SkTSwap(fx, ex);
-        dx = -dx;
-    }
-
-
-    fCount0 = chop(fx, 0, ex, dx, count);
-    count -= fCount0;
-    fx += fCount0 * dx;
-    SkASSERT(fx >= 0);
-    SkASSERT(fCount0 == 0 || (fx - dx) < 0);
-    fCount1 = chop(fx, 0xFFFF, ex, dx, count);
-    count -= fCount1;
-    fCount2 = count;
-
-#ifdef SK_DEBUG
-    fx += fCount1 * dx;
-    SkASSERT(fx <= ex);
-    if (fCount2 > 0) {
-        SkASSERT(fx >= 0xFFFF);
-        if (fCount1 > 0) {
-            SkASSERT(fx - dx < 0xFFFF);
-        }
-    }
-#endif
-
-    if (doSwap) {
-        SkTSwap(fCount0, fCount2);
-        SkTSwap(fV0, fV1);
-        dx = -dx;
-    }
-
-    if (fCount1 > 0) {
-        fFx1 = fx0 + fCount0 * (int)dx;
-    }
-
-    if (dx > 0) {
-        fCount2 += extraCount;
-    } else {
-        fCount0 += extraCount;
-    }
-}
-
-- 
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