mirror of
https://github.com/libretro/scummvm.git
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143 lines
3.8 KiB
C++
143 lines
3.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/stream.h"
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#include "common/substream.h"
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#include "common/memstream.h"
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#include "image/icocur.h"
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#include "graphics/wincursor.h"
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namespace Image {
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IcoCurDecoder::IcoCurDecoder() : _type(kTypeInvalid), _stream(nullptr), _disposeAfterUse(DisposeAfterUse::NO) {
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}
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IcoCurDecoder::~IcoCurDecoder() {
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close();
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}
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void IcoCurDecoder::close() {
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if (_disposeAfterUse == DisposeAfterUse::YES && _stream != nullptr)
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delete _stream;
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_stream = nullptr;
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_type = kTypeInvalid;
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_items.clear();
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}
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bool IcoCurDecoder::open(Common::SeekableReadStream &stream, DisposeAfterUse::Flag disposeAfterUse) {
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close();
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_stream = &stream;
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_disposeAfterUse = disposeAfterUse;
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bool loadedOK = load();
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if (!loadedOK)
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close();
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return loadedOK;
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}
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bool IcoCurDecoder::load() {
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uint8 iconDirData[6];
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if (_stream->read(iconDirData, 6) != 6)
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return false;
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if (iconDirData[0] != 0 || iconDirData[1] != 0 || (iconDirData[2] != 1 && iconDirData[2] != 2) || iconDirData[3] != 0) {
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warning("Malformed ICO/CUR header");
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return false;
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}
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uint16 numImages = READ_LE_UINT16(iconDirData + 4);
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_type = static_cast<Type>(iconDirData[2]);
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if (numImages == 0)
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return true;
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uint32 dirSize = static_cast<uint32>(numImages) * 16;
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Common::Array<uint8> iconDir;
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iconDir.resize(dirSize);
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if (_stream->read(&iconDir[0], dirSize) != dirSize)
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return false;
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_items.resize(numImages);
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for (uint i = 0; i < numImages; i++) {
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const uint8 *entryData = &iconDir[i * 16u];
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Item &item = _items[i];
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item.width = entryData[0];
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if (item.width == 0)
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item.width = 256;
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item.height = entryData[1];
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if (item.height == 0)
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item.height = 256;
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item.numColors = entryData[2];
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item.data.ico.numPlanes = READ_LE_UINT16(entryData + 4);
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item.data.ico.bitsPerPixel = READ_LE_UINT16(entryData + 6);
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item.dataSize = READ_LE_UINT32(entryData + 8);
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item.dataOffset = READ_LE_UINT32(entryData + 12);
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}
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return true;
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}
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IcoCurDecoder::Type IcoCurDecoder::getType() const {
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return _type;
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}
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uint IcoCurDecoder::numItems() const {
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return _items.size();
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}
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const IcoCurDecoder::Item &IcoCurDecoder::getItem(uint itemIndex) const {
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return _items[itemIndex];
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}
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Graphics::Cursor *IcoCurDecoder::loadItemAsCursor(uint itemIndex) const {
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const IcoCurDecoder::Item &dirItem = _items[itemIndex];
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if (_type != kTypeCUR)
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warning("ICO/CUR file type wasn't a cursor, but is being requested as a cursor anyway");
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if (static_cast<int64>(dirItem.dataOffset) > _stream->size()) {
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warning("ICO/CUR data offset was outside of the file");
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return nullptr;
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}
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if (_stream->size() - static_cast<int64>(dirItem.dataOffset) < static_cast<int64>(dirItem.dataSize)) {
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warning("ICO/CUR data bounds were outside of the file");
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return nullptr;
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}
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Common::SeekableSubReadStream substream(_stream, dirItem.dataOffset, dirItem.dataOffset + dirItem.dataSize);
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return Graphics::loadWindowsCursorFromDIB(substream, dirItem.data.cur.hotspotX, dirItem.data.cur.hotspotY);
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}
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} // End of namespace Image
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