113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkWriter32_DEFINED
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#define SkWriter32_DEFINED
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#include "SkTypes.h"
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#include "SkScalar.h"
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#include "SkPoint.h"
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#include "SkRect.h"
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class SkStream;
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class SkWStream;
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class SkWriter32 : SkNoncopyable {
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public:
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SkWriter32(size_t minSize) {
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fMinSize = minSize;
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fSize = 0;
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fHead = fTail = NULL;
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}
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~SkWriter32();
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bool writeBool(bool value) {
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this->writeInt(value);
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return value;
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}
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void writeInt(int32_t value) {
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*(int32_t*)this->reserve(sizeof(value)) = value;
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}
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void write8(int32_t value) {
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*(int32_t*)this->reserve(sizeof(value)) = value & 0xFF;
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}
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void write16(int32_t value) {
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*(int32_t*)this->reserve(sizeof(value)) = value & 0xFFFF;
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}
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void write32(int32_t value) {
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*(int32_t*)this->reserve(sizeof(value)) = value;
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}
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void writeScalar(SkScalar value) {
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*(SkScalar*)this->reserve(sizeof(value)) = value;
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}
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void writePoint(const SkPoint& pt) {
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*(SkPoint*)this->reserve(sizeof(pt)) = pt;
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}
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void writeRect(const SkRect& rect) {
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*(SkRect*)this->reserve(sizeof(rect)) = rect;
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}
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// write count bytes (must be a multiple of 4)
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void writeMul4(const void* values, size_t size) {
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SkASSERT(SkAlign4(size) == size);
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// if we could query how much is avail in the current block, we might
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// copy that much, and then alloc the rest. That would reduce the waste
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// in the current block
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memcpy(this->reserve(size), values, size);
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}
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void writePad(const void* src, size_t size);
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// return the current offset (will always be a multiple of 4)
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uint32_t size() const { return fSize; }
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void reset();
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uint32_t* reserve(size_t size); // size MUST be multiple of 4
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// return the address of the 4byte int at the specified offset (which must
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// be a multiple of 4. This does not allocate any new space, so the returned
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// address is only valid for 1 int.
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uint32_t* peek32(size_t offset);
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// copy into a single buffer (allocated by caller). Must be at least size()
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void flatten(void* dst) const;
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// read from the stream, and write up to length bytes. Return the actual
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// number of bytes written.
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size_t readFromStream(SkStream*, size_t length);
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bool writeToStream(SkWStream*);
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private:
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size_t fMinSize;
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uint32_t fSize;
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struct Block;
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Block* fHead;
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Block* fTail;
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Block* newBlock(size_t bytes);
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};
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#endif
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