| /* |
| * Copyright (C) 2007 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. |
| */ |
| |
| #define LOG_TAG "Region" |
| |
| #include <limits.h> |
| |
| #include <utils/Log.h> |
| #include <utils/String8.h> |
| |
| #include <ui/Rect.h> |
| #include <ui/Region.h> |
| #include <ui/Point.h> |
| |
| #include <private/ui/RegionHelper.h> |
| |
| // ---------------------------------------------------------------------------- |
| #define VALIDATE_REGIONS (false) |
| #define VALIDATE_WITH_CORECG (false) |
| // ---------------------------------------------------------------------------- |
| |
| #if VALIDATE_WITH_CORECG |
| #include <core/SkRegion.h> |
| #endif |
| |
| namespace android { |
| // ---------------------------------------------------------------------------- |
| |
| enum { |
| op_nand = region_operator<Rect>::op_nand, |
| op_and = region_operator<Rect>::op_and, |
| op_or = region_operator<Rect>::op_or, |
| op_xor = region_operator<Rect>::op_xor |
| }; |
| |
| // ---------------------------------------------------------------------------- |
| |
| Region::Region() |
| : mBounds(0,0) |
| { |
| } |
| |
| Region::Region(const Region& rhs) |
| : mBounds(rhs.mBounds), mStorage(rhs.mStorage) |
| { |
| } |
| |
| Region::Region(const Rect& rhs) |
| : mBounds(rhs) |
| { |
| } |
| |
| Region::Region(const void* buffer) |
| { |
| status_t err = read(buffer); |
| LOGE_IF(err<0, "error %s reading Region from buffer", strerror(err)); |
| } |
| |
| Region::~Region() |
| { |
| } |
| |
| Region& Region::operator = (const Region& rhs) |
| { |
| #if VALIDATE_REGIONS |
| validate(rhs, "operator="); |
| #endif |
| mBounds = rhs.mBounds; |
| mStorage = rhs.mStorage; |
| return *this; |
| } |
| |
| Region& Region::makeBoundsSelf() |
| { |
| mStorage.clear(); |
| return *this; |
| } |
| |
| void Region::clear() |
| { |
| mBounds.clear(); |
| mStorage.clear(); |
| } |
| |
| void Region::set(const Rect& r) |
| { |
| mBounds = r; |
| mStorage.clear(); |
| } |
| |
| void Region::set(uint32_t w, uint32_t h) |
| { |
| mBounds = Rect(int(w), int(h)); |
| mStorage.clear(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| void Region::addRectUnchecked(int l, int t, int r, int b) |
| { |
| mStorage.add(Rect(l,t,r,b)); |
| #if VALIDATE_REGIONS |
| validate(*this, "addRectUnchecked"); |
| #endif |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| Region& Region::orSelf(const Rect& r) { |
| return operationSelf(r, op_or); |
| } |
| Region& Region::andSelf(const Rect& r) { |
| return operationSelf(r, op_and); |
| } |
| Region& Region::subtractSelf(const Rect& r) { |
| return operationSelf(r, op_nand); |
| } |
| Region& Region::operationSelf(const Rect& r, int op) { |
| Region lhs(*this); |
| boolean_operation(op, *this, lhs, r); |
| return *this; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| Region& Region::orSelf(const Region& rhs) { |
| return operationSelf(rhs, op_or); |
| } |
| Region& Region::andSelf(const Region& rhs) { |
| return operationSelf(rhs, op_and); |
| } |
| Region& Region::subtractSelf(const Region& rhs) { |
| return operationSelf(rhs, op_nand); |
| } |
| Region& Region::operationSelf(const Region& rhs, int op) { |
| Region lhs(*this); |
| boolean_operation(op, *this, lhs, rhs); |
| return *this; |
| } |
| |
| Region& Region::translateSelf(int x, int y) { |
| if (x|y) translate(*this, x, y); |
| return *this; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| const Region Region::merge(const Rect& rhs) const { |
| return operation(rhs, op_or); |
| } |
| const Region Region::intersect(const Rect& rhs) const { |
| return operation(rhs, op_and); |
| } |
| const Region Region::subtract(const Rect& rhs) const { |
| return operation(rhs, op_nand); |
| } |
| const Region Region::operation(const Rect& rhs, int op) const { |
| Region result; |
| boolean_operation(op, result, *this, rhs); |
| return result; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| const Region Region::merge(const Region& rhs) const { |
| return operation(rhs, op_or); |
| } |
| const Region Region::intersect(const Region& rhs) const { |
| return operation(rhs, op_and); |
| } |
| const Region Region::subtract(const Region& rhs) const { |
| return operation(rhs, op_nand); |
| } |
| const Region Region::operation(const Region& rhs, int op) const { |
| Region result; |
| boolean_operation(op, result, *this, rhs); |
| return result; |
| } |
| |
| const Region Region::translate(int x, int y) const { |
| Region result; |
| translate(result, *this, x, y); |
| return result; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| Region& Region::orSelf(const Region& rhs, int dx, int dy) { |
| return operationSelf(rhs, dx, dy, op_or); |
| } |
| Region& Region::andSelf(const Region& rhs, int dx, int dy) { |
| return operationSelf(rhs, dx, dy, op_and); |
| } |
| Region& Region::subtractSelf(const Region& rhs, int dx, int dy) { |
| return operationSelf(rhs, dx, dy, op_nand); |
| } |
| Region& Region::operationSelf(const Region& rhs, int dx, int dy, int op) { |
| Region lhs(*this); |
| boolean_operation(op, *this, lhs, rhs, dx, dy); |
| return *this; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| const Region Region::merge(const Region& rhs, int dx, int dy) const { |
| return operation(rhs, dx, dy, op_or); |
| } |
| const Region Region::intersect(const Region& rhs, int dx, int dy) const { |
| return operation(rhs, dx, dy, op_and); |
| } |
| const Region Region::subtract(const Region& rhs, int dx, int dy) const { |
| return operation(rhs, dx, dy, op_nand); |
| } |
| const Region Region::operation(const Region& rhs, int dx, int dy, int op) const { |
| Region result; |
| boolean_operation(op, result, *this, rhs, dx, dy); |
| return result; |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| // This is our region rasterizer, which merges rects and spans together |
| // to obtain an optimal region. |
| class Region::rasterizer : public region_operator<Rect>::region_rasterizer |
| { |
| Rect& bounds; |
| Vector<Rect>& storage; |
| Rect* head; |
| Rect* tail; |
| Vector<Rect> span; |
| Rect* cur; |
| public: |
| rasterizer(Region& reg) |
| : bounds(reg.mBounds), storage(reg.mStorage), head(), tail(), cur() { |
| bounds.top = bounds.bottom = 0; |
| bounds.left = INT_MAX; |
| bounds.right = INT_MIN; |
| storage.clear(); |
| } |
| |
| ~rasterizer() { |
| if (span.size()) { |
| flushSpan(); |
| } |
| if (storage.size()) { |
| bounds.top = storage.itemAt(0).top; |
| bounds.bottom = storage.top().bottom; |
| if (storage.size() == 1) { |
| storage.clear(); |
| } |
| } else { |
| bounds.left = 0; |
| bounds.right = 0; |
| } |
| } |
| |
| virtual void operator()(const Rect& rect) { |
| //LOGD(">>> %3d, %3d, %3d, %3d", |
| // rect.left, rect.top, rect.right, rect.bottom); |
| if (span.size()) { |
| if (cur->top != rect.top) { |
| flushSpan(); |
| } else if (cur->right == rect.left) { |
| cur->right = rect.right; |
| return; |
| } |
| } |
| span.add(rect); |
| cur = span.editArray() + (span.size() - 1); |
| } |
| private: |
| template<typename T> |
| static inline T min(T rhs, T lhs) { return rhs < lhs ? rhs : lhs; } |
| template<typename T> |
| static inline T max(T rhs, T lhs) { return rhs > lhs ? rhs : lhs; } |
| void flushSpan() { |
| bool merge = false; |
| if (tail-head == ssize_t(span.size())) { |
| Rect const* p = span.editArray(); |
| Rect const* q = head; |
| if (p->top == q->bottom) { |
| merge = true; |
| while (q != tail) { |
| if ((p->left != q->left) || (p->right != q->right)) { |
| merge = false; |
| break; |
| } |
| p++, q++; |
| } |
| } |
| } |
| if (merge) { |
| const int bottom = span[0].bottom; |
| Rect* r = head; |
| while (r != tail) { |
| r->bottom = bottom; |
| r++; |
| } |
| } else { |
| bounds.left = min(span.itemAt(0).left, bounds.left); |
| bounds.right = max(span.top().right, bounds.right); |
| storage.appendVector(span); |
| tail = storage.editArray() + storage.size(); |
| head = tail - span.size(); |
| } |
| span.clear(); |
| } |
| }; |
| |
| bool Region::validate(const Region& reg, const char* name) |
| { |
| bool result = true; |
| const_iterator cur = reg.begin(); |
| const_iterator const tail = reg.end(); |
| const_iterator prev = cur++; |
| Rect b(*prev); |
| while (cur != tail) { |
| b.left = b.left < cur->left ? b.left : cur->left; |
| b.top = b.top < cur->top ? b.top : cur->top; |
| b.right = b.right > cur->right ? b.right : cur->right; |
| b.bottom = b.bottom > cur->bottom ? b.bottom : cur->bottom; |
| if (cur->top == prev->top) { |
| if (cur->bottom != prev->bottom) { |
| LOGE("%s: invalid span %p", name, cur); |
| result = false; |
| } else if (cur->left < prev->right) { |
| LOGE("%s: spans overlap horizontally prev=%p, cur=%p", |
| name, prev, cur); |
| result = false; |
| } |
| } else if (cur->top < prev->bottom) { |
| LOGE("%s: spans overlap vertically prev=%p, cur=%p", |
| name, prev, cur); |
| result = false; |
| } |
| prev = cur; |
| cur++; |
| } |
| if (b != reg.getBounds()) { |
| result = false; |
| LOGE("%s: invalid bounds [%d,%d,%d,%d] vs. [%d,%d,%d,%d]", name, |
| b.left, b.top, b.right, b.bottom, |
| reg.getBounds().left, reg.getBounds().top, |
| reg.getBounds().right, reg.getBounds().bottom); |
| } |
| if (result == false) { |
| reg.dump(name); |
| } |
| return result; |
| } |
| |
| void Region::boolean_operation(int op, Region& dst, |
| const Region& lhs, |
| const Region& rhs, int dx, int dy) |
| { |
| size_t lhs_count; |
| Rect const * const lhs_rects = lhs.getArray(&lhs_count); |
| |
| size_t rhs_count; |
| Rect const * const rhs_rects = rhs.getArray(&rhs_count); |
| |
| region_operator<Rect>::region lhs_region(lhs_rects, lhs_count); |
| region_operator<Rect>::region rhs_region(rhs_rects, rhs_count, dx, dy); |
| region_operator<Rect> operation(op, lhs_region, rhs_region); |
| { // scope for rasterizer (dtor has side effects) |
| rasterizer r(dst); |
| operation(r); |
| } |
| |
| #if VALIDATE_REGIONS |
| validate(lhs, "boolean_operation: lhs"); |
| validate(rhs, "boolean_operation: rhs"); |
| validate(dst, "boolean_operation: dst"); |
| #endif |
| |
| #if VALIDATE_WITH_CORECG |
| SkRegion sk_lhs; |
| SkRegion sk_rhs; |
| SkRegion sk_dst; |
| |
| for (size_t i=0 ; i<lhs_count ; i++) |
| sk_lhs.op( |
| lhs_rects[i].left + dx, |
| lhs_rects[i].top + dy, |
| lhs_rects[i].right + dx, |
| lhs_rects[i].bottom + dy, |
| SkRegion::kUnion_Op); |
| |
| for (size_t i=0 ; i<rhs_count ; i++) |
| sk_rhs.op( |
| rhs_rects[i].left + dx, |
| rhs_rects[i].top + dy, |
| rhs_rects[i].right + dx, |
| rhs_rects[i].bottom + dy, |
| SkRegion::kUnion_Op); |
| |
| const char* name = "---"; |
| SkRegion::Op sk_op; |
| switch (op) { |
| case op_or: sk_op = SkRegion::kUnion_Op; name="OR"; break; |
| case op_and: sk_op = SkRegion::kIntersect_Op; name="AND"; break; |
| case op_nand: sk_op = SkRegion::kDifference_Op; name="NAND"; break; |
| } |
| sk_dst.op(sk_lhs, sk_rhs, sk_op); |
| |
| if (sk_dst.isEmpty() && dst.isEmpty()) |
| return; |
| |
| bool same = true; |
| Region::const_iterator head = dst.begin(); |
| Region::const_iterator const tail = dst.end(); |
| SkRegion::Iterator it(sk_dst); |
| while (!it.done()) { |
| if (head != tail) { |
| if ( |
| head->left != it.rect().fLeft || |
| head->top != it.rect().fTop || |
| head->right != it.rect().fRight || |
| head->bottom != it.rect().fBottom |
| ) { |
| same = false; |
| break; |
| } |
| } else { |
| same = false; |
| break; |
| } |
| head++; |
| it.next(); |
| } |
| |
| if (head != tail) { |
| same = false; |
| } |
| |
| if(!same) { |
| LOGD("---\nregion boolean %s failed", name); |
| lhs.dump("lhs"); |
| rhs.dump("rhs"); |
| dst.dump("dst"); |
| LOGD("should be"); |
| SkRegion::Iterator it(sk_dst); |
| while (!it.done()) { |
| LOGD(" [%3d, %3d, %3d, %3d]", |
| it.rect().fLeft, |
| it.rect().fTop, |
| it.rect().fRight, |
| it.rect().fBottom); |
| it.next(); |
| } |
| } |
| #endif |
| } |
| |
| void Region::boolean_operation(int op, Region& dst, |
| const Region& lhs, |
| const Rect& rhs, int dx, int dy) |
| { |
| #if VALIDATE_WITH_CORECG || VALIDATE_REGIONS |
| boolean_operation(op, dst, lhs, Region(rhs), dx, dy); |
| #else |
| size_t lhs_count; |
| Rect const * const lhs_rects = lhs.getArray(&lhs_count); |
| |
| region_operator<Rect>::region lhs_region(lhs_rects, lhs_count); |
| region_operator<Rect>::region rhs_region(&rhs, 1, dx, dy); |
| region_operator<Rect> operation(op, lhs_region, rhs_region); |
| { // scope for rasterizer (dtor has side effects) |
| rasterizer r(dst); |
| operation(r); |
| } |
| |
| #endif |
| } |
| |
| void Region::boolean_operation(int op, Region& dst, |
| const Region& lhs, const Region& rhs) |
| { |
| boolean_operation(op, dst, lhs, rhs, 0, 0); |
| } |
| |
| void Region::boolean_operation(int op, Region& dst, |
| const Region& lhs, const Rect& rhs) |
| { |
| boolean_operation(op, dst, lhs, rhs, 0, 0); |
| } |
| |
| void Region::translate(Region& reg, int dx, int dy) |
| { |
| if (!reg.isEmpty()) { |
| #if VALIDATE_REGIONS |
| validate(reg, "translate (before)"); |
| #endif |
| reg.mBounds.translate(dx, dy); |
| size_t count = reg.mStorage.size(); |
| Rect* rects = reg.mStorage.editArray(); |
| while (count) { |
| rects->translate(dx, dy); |
| rects++; |
| count--; |
| } |
| #if VALIDATE_REGIONS |
| validate(reg, "translate (after)"); |
| #endif |
| } |
| } |
| |
| void Region::translate(Region& dst, const Region& reg, int dx, int dy) |
| { |
| dst = reg; |
| translate(dst, dx, dy); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| ssize_t Region::write(void* buffer, size_t size) const |
| { |
| #if VALIDATE_REGIONS |
| validate(*this, "write(buffer)"); |
| #endif |
| const size_t count = mStorage.size(); |
| const size_t sizeNeeded = sizeof(int32_t) + (1+count)*sizeof(Rect); |
| if (buffer != NULL) { |
| if (sizeNeeded > size) return NO_MEMORY; |
| int32_t* const p = static_cast<int32_t*>(buffer); |
| *p = count; |
| memcpy(p+1, &mBounds, sizeof(Rect)); |
| if (count) { |
| memcpy(p+5, mStorage.array(), count*sizeof(Rect)); |
| } |
| } |
| return ssize_t(sizeNeeded); |
| } |
| |
| ssize_t Region::read(const void* buffer) |
| { |
| int32_t const* const p = static_cast<int32_t const*>(buffer); |
| const size_t count = *p; |
| memcpy(&mBounds, p+1, sizeof(Rect)); |
| mStorage.clear(); |
| if (count) { |
| mStorage.insertAt(0, count); |
| memcpy(mStorage.editArray(), p+5, count*sizeof(Rect)); |
| } |
| #if VALIDATE_REGIONS |
| validate(*this, "read(buffer)"); |
| #endif |
| return ssize_t(sizeof(int32_t) + (1+count)*sizeof(Rect)); |
| } |
| |
| ssize_t Region::writeEmpty(void* buffer, size_t size) |
| { |
| const size_t sizeNeeded = sizeof(int32_t) + sizeof(Rect); |
| if (sizeNeeded > size) return NO_MEMORY; |
| int32_t* const p = static_cast<int32_t*>(buffer); |
| memset(p, 0, sizeNeeded); |
| return ssize_t(sizeNeeded); |
| } |
| |
| bool Region::isEmpty(void* buffer) |
| { |
| int32_t const* const p = static_cast<int32_t const*>(buffer); |
| Rect const* const b = reinterpret_cast<Rect const *>(p+1); |
| return b->isEmpty(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| Region::const_iterator Region::begin() const { |
| return isRect() ? &mBounds : mStorage.array(); |
| } |
| |
| Region::const_iterator Region::end() const { |
| return isRect() ? ((&mBounds) + 1) : (mStorage.array() + mStorage.size()); |
| } |
| |
| Rect const* Region::getArray(size_t* count) const { |
| const_iterator const b(begin()); |
| const_iterator const e(end()); |
| if (count) *count = e-b; |
| return b; |
| } |
| |
| size_t Region::getRects(Vector<Rect>& rectList) const |
| { |
| rectList = mStorage; |
| if (rectList.isEmpty()) { |
| rectList.clear(); |
| rectList.add(mBounds); |
| } |
| return rectList.size(); |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| void Region::dump(String8& out, const char* what, uint32_t flags) const |
| { |
| (void)flags; |
| const_iterator head = begin(); |
| const_iterator const tail = end(); |
| |
| size_t SIZE = 256; |
| char buffer[SIZE]; |
| |
| snprintf(buffer, SIZE, " Region %s (this=%p, count=%d)\n", |
| what, this, tail-head); |
| out.append(buffer); |
| while (head != tail) { |
| snprintf(buffer, SIZE, " [%3d, %3d, %3d, %3d]\n", |
| head->left, head->top, head->right, head->bottom); |
| out.append(buffer); |
| head++; |
| } |
| } |
| |
| void Region::dump(const char* what, uint32_t flags) const |
| { |
| (void)flags; |
| const_iterator head = begin(); |
| const_iterator const tail = end(); |
| LOGD(" Region %s (this=%p, count=%d)\n", what, this, tail-head); |
| while (head != tail) { |
| LOGD(" [%3d, %3d, %3d, %3d]\n", |
| head->left, head->top, head->right, head->bottom); |
| head++; |
| } |
| } |
| |
| // ---------------------------------------------------------------------------- |
| |
| }; // namespace android |