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/*
* Copyright (c) 2021 - 2023 the ThorVG project. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <memory.h>
#include <fstream>
#include "tvgLoader.h"
#include "tvgTvgLoader.h"
#include "tvgLzw.h"
/************************************************************************/
/* Internal Class Implementation */
/************************************************************************/
void TvgLoader::clear()
{
if (copy) free((char*)data);
ptr = data = nullptr;
size = 0;
copy = false;
if (interpreter) {
delete(interpreter);
interpreter = nullptr;
}
}
/* WARNING: Header format shall not change! */
bool TvgLoader::readHeader()
{
if (!ptr) return false;
//Make sure the size is large enough to hold the header
if (size < TVG_HEADER_SIZE) return false;
//1. Signature
if (memcmp(ptr, TVG_HEADER_SIGNATURE, TVG_HEADER_SIGNATURE_LENGTH)) return false;
ptr += TVG_HEADER_SIGNATURE_LENGTH;
//2. Version
char version[TVG_HEADER_VERSION_LENGTH + 1];
memcpy(version, ptr, TVG_HEADER_VERSION_LENGTH);
version[TVG_HEADER_VERSION_LENGTH - 1] = '\0';
ptr += TVG_HEADER_VERSION_LENGTH;
this->version = atoi(version);
if (this->version > THORVG_VERSION_NUMBER()) {
TVGLOG("TVG", "This TVG file expects a higher version(%d) of ThorVG symbol(%d)", this->version, THORVG_VERSION_NUMBER());
}
//3. View Size
READ_FLOAT(&w, ptr);
ptr += SIZE(float);
READ_FLOAT(&h, ptr);
ptr += SIZE(float);
//4. Reserved
if (*ptr & TVG_HEAD_FLAG_COMPRESSED) compressed = true;
ptr += TVG_HEADER_RESERVED_LENGTH;
//5. Compressed Size if any
if (compressed) {
auto p = ptr;
//TVG_HEADER_UNCOMPRESSED_SIZE
memcpy(&uncompressedSize, p, sizeof(uint32_t));
p += SIZE(uint32_t);
//TVG_HEADER_COMPRESSED_SIZE
memcpy(&compressedSize, p, sizeof(uint32_t));
p += SIZE(uint32_t);
//TVG_HEADER_COMPRESSED_SIZE_BITS
memcpy(&compressedSizeBits, p, sizeof(uint32_t));
}
ptr += TVG_HEADER_COMPRESS_SIZE;
//Decide the proper Tvg Binary Interpreter based on the current file version
if (this->version >= 0) interpreter = new TvgBinInterpreter;
return true;
}
/************************************************************************/
/* External Class Implementation */
/************************************************************************/
TvgLoader::~TvgLoader()
{
close();
}
bool TvgLoader::open(const string &path)
{
clear();
ifstream f;
f.open(path, ifstream::in | ifstream::binary | ifstream::ate);
if (!f.is_open()) return false;
size = f.tellg();
f.seekg(0, ifstream::beg);
copy = true;
data = (char*)malloc(size);
if (!data) {
clear();
f.close();
return false;
}
if (!f.read((char*)data, size))
{
clear();
f.close();
return false;
}
f.close();
ptr = data;
return readHeader();
}
bool TvgLoader::open(const char *data, uint32_t size, bool copy)
{
clear();
if (copy) {
this->data = (char*)malloc(size);
if (!this->data) return false;
memcpy((char*)this->data, data, size);
} else this->data = data;
this->ptr = this->data;
this->size = size;
this->copy = copy;
return readHeader();
}
bool TvgLoader::resize(Paint* paint, float w, float h)
{
if (!paint) return false;
auto sx = w / this->w;
auto sy = h / this->h;
//Scale
auto scale = sx < sy ? sx : sy;
paint->scale(scale);
//Align
float tx = 0, ty = 0;
auto sw = this->w * scale;
auto sh = this->h * scale;
if (sw > sh) ty -= (h - sh) * 0.5f;
else tx -= (w - sw) * 0.5f;
paint->translate(-tx, -ty);
return true;
}
bool TvgLoader::read()
{
if (!ptr || size == 0) return false;
TaskScheduler::request(this);
return true;
}
bool TvgLoader::close()
{
this->done();
clear();
return true;
}
void TvgLoader::run(unsigned tid)
{
if (root) root.reset();
auto data = const_cast<char*>(ptr);
if (compressed) {
data = (char*) lzwDecode((uint8_t*) data, compressedSize, compressedSizeBits, uncompressedSize);
root = interpreter->run(data, data + uncompressedSize);
free(data);
} else {
root = interpreter->run(data, this->data + size);
}
if (!root) clear();
}
unique_ptr<Paint> TvgLoader::paint()
{
this->done();
if (root) return move(root);
return nullptr;
}
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