grab from latest android

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

1 files changed, 144 insertions, 0 deletions

diff --git a/src/core/SkFilterProc.h b/src/core/SkFilterProc.h
new file mode 100644
index 0000000000..9af4ed52ff
--- /dev/null
+++ b/src/core/SkFilterProc.h
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2006-2008 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 SkFilter_DEFINED
+#define SkFilter_DEFINED
+
+#include "SkMath.h"
+#include "SkFixed.h"
+
+typedef unsigned (*SkFilterProc)(unsigned x00, unsigned x01,
+                                 unsigned x10, unsigned x11);
+
+const SkFilterProc* SkGetBilinearFilterProcTable();
+
+inline SkFilterProc SkGetBilinearFilterProc(const SkFilterProc* table,
+                                            SkFixed x, SkFixed y)
+{
+    SkASSERT(table);
+    
+    // convert to dot 2
+    x = (unsigned)(x << 16) >> 30;
+    y = (unsigned)(y << 16) >> 30;
+    return table[(y << 2) | x];
+}
+
+inline SkFilterProc SkGetBilinearFilterProc22(const SkFilterProc* table,
+                                              unsigned x, unsigned y)
+{
+    SkASSERT(table);
+    
+    // extract low 2 bits
+    x = x << 30 >> 30;
+    y = y << 30 >> 30;
+    return table[(y << 2) | x];
+}
+
+inline const SkFilterProc* SkGetBilinearFilterProc22Row(const SkFilterProc* table,
+                                                        unsigned y)
+{
+    SkASSERT(table);
+    // extract low 2 bits and shift up 2
+    return &table[y << 30 >> 28];
+}
+
+inline SkFilterProc SkGetBilinearFilterProc22RowProc(const SkFilterProc* row,
+                                                     unsigned x)
+{
+    SkASSERT(row);    
+    // extract low 2 bits
+    return row[x << 30 >> 30];
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+typedef unsigned (*SkFilter32Proc)(uint32_t x00, uint32_t x01,
+                                   uint32_t x10, uint32_t x11);
+
+const SkFilter32Proc* SkGetFilter32ProcTable();
+
+inline SkFilter32Proc SkGetFilter32Proc22(const SkFilter32Proc* table,
+                                          unsigned x, unsigned y)
+{
+    SkASSERT(table);
+    
+    // extract low 2 bits
+    x = x << 30 >> 30;
+    y = y << 30 >> 30;
+    return table[(y << 2) | x];
+}
+
+inline const SkFilter32Proc* SkGetFilter32Proc22Row(const SkFilter32Proc* table,
+                                                    unsigned y)
+{
+    SkASSERT(table);
+    // extract low 2 bits and shift up 2
+    return &table[y << 30 >> 28];
+}
+
+inline SkFilter32Proc SkGetFilter32Proc22RowProc(const SkFilter32Proc* row,
+                                                 unsigned x)
+{
+    SkASSERT(row);
+    // extract low 2 bits
+    return row[x << 30 >> 30];
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+/** Special version of SkFilterProc. This takes the address of 4 ints, and combines them a byte at a
+    time. AABBCCDD.
+*/
+typedef uint32_t (*SkFilterPtrProc)(const uint32_t*, const uint32_t*, const uint32_t*, const uint32_t*);
+
+const SkFilterPtrProc* SkGetBilinearFilterPtrProcTable();
+inline SkFilterPtrProc SkGetBilinearFilterPtrProc(const SkFilterPtrProc* table, SkFixed x, SkFixed y)
+{
+    SkASSERT(table);
+
+    // convert to dot 2
+    x = (unsigned)(x << 16) >> 30;
+    y = (unsigned)(y << 16) >> 30;
+    return table[(y << 2) | x];
+}
+
+/** Given a Y value, return a subset of the proc table for that value.
+    Pass this to SkGetBilinearFilterPtrXProc with the corresponding X value to get the
+    correct proc.
+*/
+inline const SkFilterPtrProc* SkGetBilinearFilterPtrProcYTable(const SkFilterPtrProc* table, SkFixed y)
+{
+    SkASSERT(table);
+
+    y = (unsigned)(y << 16) >> 30;
+    return table + (y << 2);
+}
+
+/** Given a subtable returned by SkGetBilinearFilterPtrProcYTable(), return the proc for the
+    specified X value.
+*/
+inline SkFilterPtrProc SkGetBilinearFilterPtrXProc(const SkFilterPtrProc* table, SkFixed x)
+{
+    SkASSERT(table);
+
+    // convert to dot 2
+    x = (unsigned)(x << 16) >> 30;
+    return table[x];
+}
+
+#endif
+
+