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-rw-r--r--include/private/ui/RegionHelper.h284
1 files changed, 0 insertions, 284 deletions
diff --git a/include/private/ui/RegionHelper.h b/include/private/ui/RegionHelper.h
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index 8d76533..0000000
--- a/include/private/ui/RegionHelper.h
+++ /dev/null
@@ -1,284 +0,0 @@
-/*
- * Copyright (C) 2009 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 ANDROID_UI_PRIVATE_REGION_HELPER_H
-#define ANDROID_UI_PRIVATE_REGION_HELPER_H
-
-#include <stdint.h>
-#include <sys/types.h>
-
-namespace android {
-// ----------------------------------------------------------------------------
-
-template<typename RECT>
-class region_operator
-{
- typedef typename RECT::value_type TYPE;
- static const TYPE max_value = 0x7FFFFFF;
-
-public:
- /*
- * Common boolean operations:
- * value is computed as 0b101 op 0b110
- * other boolean operation are possible, simply compute
- * their corresponding value with the above formulae and use
- * it when instantiating a region_operator.
- */
- static const uint32_t LHS = 0x5; // 0b101
- static const uint32_t RHS = 0x6; // 0b110
- enum {
- op_nand = LHS & ~RHS,
- op_and = LHS & RHS,
- op_or = LHS | RHS,
- op_xor = LHS ^ RHS
- };
-
- struct region {
- RECT const* rects;
- size_t count;
- TYPE dx;
- TYPE dy;
- inline region(const region& rhs)
- : rects(rhs.rects), count(rhs.count), dx(rhs.dx), dy(rhs.dy) { }
- inline region(RECT const* r, size_t c)
- : rects(r), count(c), dx(), dy() { }
- inline region(RECT const* r, size_t c, TYPE dx, TYPE dy)
- : rects(r), count(c), dx(dx), dy(dy) { }
- };
-
- class region_rasterizer {
- friend class region_operator;
- virtual void operator()(const RECT& rect) = 0;
- public:
- virtual ~region_rasterizer() { };
- };
-
- inline region_operator(int op, const region& lhs, const region& rhs)
- : op_mask(op), spanner(lhs, rhs)
- {
- }
-
- void operator()(region_rasterizer& rasterizer) {
- RECT current;
- do {
- SpannerInner spannerInner(spanner.lhs, spanner.rhs);
- int inside = spanner.next(current.top, current.bottom);
- spannerInner.prepare(inside);
- do {
- TYPE left, right;
- int inside = spannerInner.next(current.left, current.right);
- if ((op_mask >> inside) & 1) {
- if (current.left < current.right &&
- current.top < current.bottom) {
- rasterizer(current);
- }
- }
- } while(!spannerInner.isDone());
- } while(!spanner.isDone());
- }
-
-private:
- uint32_t op_mask;
-
- class SpannerBase
- {
- public:
- enum {
- lhs_before_rhs = 0,
- lhs_after_rhs = 1,
- lhs_coincide_rhs = 2
- };
-
- protected:
- TYPE lhs_head;
- TYPE lhs_tail;
- TYPE rhs_head;
- TYPE rhs_tail;
-
- inline int next(TYPE& head, TYPE& tail,
- bool& more_lhs, bool& more_rhs)
- {
- int inside;
- more_lhs = false;
- more_rhs = false;
- if (lhs_head < rhs_head) {
- inside = lhs_before_rhs;
- head = lhs_head;
- if (lhs_tail <= rhs_head) {
- tail = lhs_tail;
- more_lhs = true;
- } else {
- lhs_head = rhs_head;
- tail = rhs_head;
- }
- } else if (rhs_head < lhs_head) {
- inside = lhs_after_rhs;
- head = rhs_head;
- if (rhs_tail <= lhs_head) {
- tail = rhs_tail;
- more_rhs = true;
- } else {
- rhs_head = lhs_head;
- tail = lhs_head;
- }
- } else {
- inside = lhs_coincide_rhs;
- head = lhs_head;
- if (lhs_tail <= rhs_tail) {
- tail = rhs_head = lhs_tail;
- more_lhs = true;
- }
- if (rhs_tail <= lhs_tail) {
- tail = lhs_head = rhs_tail;
- more_rhs = true;
- }
- }
- return inside;
- }
- };
-
- class Spanner : protected SpannerBase
- {
- friend class region_operator;
- region lhs;
- region rhs;
-
- public:
- inline Spanner(const region& lhs, const region& rhs)
- : lhs(lhs), rhs(rhs)
- {
- SpannerBase::lhs_head = lhs.rects->top + lhs.dy;
- SpannerBase::lhs_tail = lhs.rects->bottom + lhs.dy;
- SpannerBase::rhs_head = rhs.rects->top + rhs.dy;
- SpannerBase::rhs_tail = rhs.rects->bottom + rhs.dy;
- }
-
- inline bool isDone() const {
- return !rhs.count && !lhs.count;
- }
-
- inline int next(TYPE& top, TYPE& bottom)
- {
- bool more_lhs = false;
- bool more_rhs = false;
- int inside = SpannerBase::next(top, bottom, more_lhs, more_rhs);
- if (more_lhs) {
- advance(lhs, SpannerBase::lhs_head, SpannerBase::lhs_tail);
- }
- if (more_rhs) {
- advance(rhs, SpannerBase::rhs_head, SpannerBase::rhs_tail);
- }
- return inside;
- }
-
- private:
- static inline
- void advance(region& reg, TYPE& aTop, TYPE& aBottom) {
- // got to next span
- size_t count = reg.count;
- RECT const * rects = reg.rects;
- RECT const * const end = rects + count;
- const int top = rects->top;
- while (rects != end && rects->top == top) {
- rects++;
- count--;
- }
- if (rects != end) {
- aTop = rects->top + reg.dy;
- aBottom = rects->bottom + reg.dy;
- } else {
- aTop = max_value;
- aBottom = max_value;
- }
- reg.rects = rects;
- reg.count = count;
- }
- };
-
- class SpannerInner : protected SpannerBase
- {
- region lhs;
- region rhs;
-
- public:
- inline SpannerInner(const region& lhs, const region& rhs)
- : lhs(lhs), rhs(rhs)
- {
- }
-
- inline void prepare(int inside) {
- if (inside == SpannerBase::lhs_before_rhs) {
- SpannerBase::lhs_head = lhs.rects->left + lhs.dx;
- SpannerBase::lhs_tail = lhs.rects->right + lhs.dx;
- SpannerBase::rhs_head = max_value;
- SpannerBase::rhs_tail = max_value;
- } else if (inside == SpannerBase::lhs_after_rhs) {
- SpannerBase::lhs_head = max_value;
- SpannerBase::lhs_tail = max_value;
- SpannerBase::rhs_head = rhs.rects->left + rhs.dx;
- SpannerBase::rhs_tail = rhs.rects->right + rhs.dx;
- } else {
- SpannerBase::lhs_head = lhs.rects->left + lhs.dx;
- SpannerBase::lhs_tail = lhs.rects->right + lhs.dx;
- SpannerBase::rhs_head = rhs.rects->left + rhs.dx;
- SpannerBase::rhs_tail = rhs.rects->right + rhs.dx;
- }
- }
-
- inline bool isDone() const {
- return SpannerBase::lhs_head == max_value &&
- SpannerBase::rhs_head == max_value;
- }
-
- inline int next(TYPE& left, TYPE& right)
- {
- bool more_lhs = false;
- bool more_rhs = false;
- int inside = SpannerBase::next(left, right, more_lhs, more_rhs);
- if (more_lhs) {
- advance(lhs, SpannerBase::lhs_head, SpannerBase::lhs_tail);
- }
- if (more_rhs) {
- advance(rhs, SpannerBase::rhs_head, SpannerBase::rhs_tail);
- }
- return inside;
- }
-
- private:
- static inline
- void advance(region& reg, TYPE& left, TYPE& right) {
- if (reg.rects && reg.count) {
- const int cur_span_top = reg.rects->top;
- reg.rects++;
- reg.count--;
- if (!reg.count || reg.rects->top != cur_span_top) {
- left = max_value;
- right = max_value;
- } else {
- left = reg.rects->left + reg.dx;
- right = reg.rects->right + reg.dx;
- }
- }
- }
- };
-
- Spanner spanner;
-};
-
-// ----------------------------------------------------------------------------
-};
-
-#endif /* ANDROID_UI_PRIVATE_REGION_HELPER_H */
generated by cgit v1.1 at 2025-01-08 02:41:25 +0000