mirror of
https://github.com/libretro/scummvm.git
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294 lines
8.4 KiB
C++
294 lines
8.4 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/scummsys.h"
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#include "common/archive.h"
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#include "common/memstream.h"
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#include "common/textconsole.h"
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#include "xeen/xeen.h"
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#include "xeen/sprites.h"
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namespace Xeen {
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SpriteResource::SpriteResource() {
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_filesize = 0;
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_data = nullptr;
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}
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SpriteResource::SpriteResource(const Common::String &filename) {
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_data = nullptr;
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load(filename);
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}
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SpriteResource::~SpriteResource() {
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clear();
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}
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/**
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* Copy operator for duplicating a sprite resource
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*/
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SpriteResource &SpriteResource::operator=(const SpriteResource &src) {
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delete[] _data;
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_index.clear();
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_filesize = src._filesize;
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_data = new byte[_filesize];
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Common::copy(src._data, src._data + _filesize, _data);
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_index.resize(src._index.size());
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for (uint i = 0; i < src._index.size(); ++i)
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_index[i] = src._index[i];
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return *this;
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}
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/**
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* Load a sprite resource from a given file
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*/
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void SpriteResource::load(const Common::String &filename) {
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File f(filename);
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load(f);
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}
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/**
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* Load a sprite resource from a given file and archive
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*/
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void SpriteResource::load(const Common::String &filename, Common::Archive &archive) {
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File f(filename, archive);
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load(f);
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}
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/**
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* Load a sprite resource from a stream
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*/
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void SpriteResource::load(Common::SeekableReadStream &f) {
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// Read in a copy of the file
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_filesize = f.size();
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delete[] _data;
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_data = new byte[_filesize];
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f.read(_data, _filesize);
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// Read in the index
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f.seek(0);
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int count = f.readUint16LE();
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_index.resize(count);
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for (int i = 0; i < count; ++i) {
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_index[i]._offset1 = f.readUint16LE();
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_index[i]._offset2 = f.readUint16LE();
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}
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}
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/**
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* Clears the sprite resource
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*/
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void SpriteResource::clear() {
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delete[] _data;
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_data = nullptr;
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_filesize = 0;
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}
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/**
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* Draws a frame using data at a specific offset in the sprite resource
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*/
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void SpriteResource::drawOffset(XSurface &dest, uint16 offset, const Common::Point &destPos, int flags) const {
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// Get cell header
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Common::MemoryReadStream f(_data, _filesize);
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f.seek(offset);
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int xOffset = f.readUint16LE();
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int width = f.readUint16LE();
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int yOffset = f.readUint16LE();
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int height = f.readUint16LE();
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bool flipped = (flags & SPRFLAG_HORIZ_FLIPPED) != 0;
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int xInc = flipped ? -1 : 1;
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if (flags & SPRFLAG_RESIZE) {
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if (dest.w < (xOffset + width) || dest.h < (yOffset + height))
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dest.create(xOffset + width, yOffset + height);
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}
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// The pattern steps used in the pattern command
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const int patternSteps[] = { 0, 1, 1, 1, 2, 2, 3, 3, 0, -1, -1, -1, -2, -2, -3, -3 };
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// Main loop
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int opr1, opr2;
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int32 pos;
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for (int yPos = yOffset, byteCount = 0; yPos < height + yOffset; yPos++, byteCount = 0) {
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// The number of bytes in this scan line
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int lineLength = f.readByte();
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if (lineLength == 0) {
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// Skip the specified number of scan lines
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yPos += f.readByte();
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} else if ((destPos.y + yPos) < 0 || (destPos.y + yPos) >= dest.h) {
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// Skip over the bytes of the line
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f.skip(lineLength);
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} else {
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// Skip the transparent pixels at the beginning of the scan line
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int xPos = f.readByte() + xOffset; ++byteCount;
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const byte *lineStartP = (const byte *)dest.getBasePtr(0, destPos.y + yPos);
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const byte *lineEndP = (const byte *)dest.getBasePtr(dest.w, destPos.y + yPos);
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byte *destP = !flipped ?
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(byte *)dest.getBasePtr(destPos.x + xPos, destPos.y + yPos) :
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(byte *)dest.getBasePtr(destPos.x + width - xPos, destPos.y + yPos);
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while (byteCount < lineLength) {
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// The next byte is an opcode that determines what
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// operators are to follow and how to interpret them.
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int opcode = f.readByte(); ++byteCount;
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// Decode the opcode
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int len = opcode & 0x1F;
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int cmd = (opcode & 0xE0) >> 5;
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switch (cmd) {
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case 0: // The following len + 1 bytes are stored as indexes into the color table.
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case 1: // The following len + 33 bytes are stored as indexes into the color table.
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for (int i = 0; i < opcode + 1; ++i, ++xPos) {
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byte b = f.readByte();
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++byteCount;
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if (destP >= lineStartP && destP < lineEndP)
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*destP = b;
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destP += xInc;
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}
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break;
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case 2: // The following byte is an index into the color table, draw it len + 3 times.
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opr1 = f.readByte(); ++byteCount;
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for (int i = 0; i < len + 3; ++i, ++xPos) {
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if (destP >= lineStartP && destP < lineEndP)
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*destP = opr1;
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destP += xInc;
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}
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break;
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case 3: // Stream copy command.
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opr1 = f.readUint16LE(); byteCount += 2;
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pos = f.pos();
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f.seek(-opr1, SEEK_CUR);
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for (int i = 0; i < len + 4; ++i, ++xPos) {
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byte b = f.readByte();
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if (destP >= lineStartP && destP < lineEndP)
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*destP = b;
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destP += xInc;
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}
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f.seek(pos, SEEK_SET);
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break;
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case 4: // The following two bytes are indexes into the color table, draw the pair len + 2 times.
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opr1 = f.readByte(); ++byteCount;
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opr2 = f.readByte(); ++byteCount;
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for (int i = 0; i < len + 2; ++i, xPos += 2) {
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if (destP < lineStartP || destP >= (lineEndP - 1)) {
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destP += 2 * xInc;
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} else {
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*destP = opr1;
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destP += xInc;
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*destP = opr2;
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destP += xInc;
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}
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}
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break;
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case 5: // Skip len + 1 pixels filling them with the transparent color.
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xPos += len + 1;
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destP += (len + 1) * xInc;
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break;
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case 6: // Pattern command.
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case 7:
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// The pattern command has a different opcode format
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len = opcode & 0x07;
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cmd = (opcode >> 2) & 0x0E;
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opr1 = f.readByte(); ++byteCount;
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for (int i = 0; i < len + 3; ++i, ++xPos) {
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if (destP >= lineStartP && destP < lineEndP)
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*destP = opr1;
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destP += xInc;
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opr1 += patternSteps[cmd + (i % 2)];
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}
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break;
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default:
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break;
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}
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}
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assert(byteCount == lineLength);
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}
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}
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Common::Rect r(Common::Rect(destPos.x + xOffset, destPos.y + yOffset,
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destPos.x + xOffset + width, destPos.y + yOffset + height));
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r.clip(Common::Rect(0, 0, dest.w, dest.h));
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if (!r.isEmpty())
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dest.addDirtyRect(r);
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}
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/**
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* Draw the sprite onto the given surface
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*/
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void SpriteResource::draw(XSurface &dest, int frame, const Common::Point &destPos,
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int flags, int scale) const {
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assert(scale != 0x8000); // TODO: TO test when I find scale value used
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if (scale == 0) {
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drawOffset(dest, _index[frame]._offset1, destPos, flags);
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if (_index[frame]._offset2)
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drawOffset(dest, _index[frame]._offset2, destPos, flags);
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} else {
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// Get the bounds for the surface and create a temporary one
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Common::MemoryReadStream f(_data, _filesize);
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f.seek(_index[frame]._offset1);
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int xOffset = f.readUint16LE();
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int width = f.readUint16LE();
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int yOffset = f.readUint16LE();
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int height = f.readUint16LE();
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XSurface tempSurface(xOffset + width, yOffset + height);
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// Draw sprite into temporary surface
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tempSurface.fillRect(Common::Rect(0, 0, width, height), 0);
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drawOffset(tempSurface, _index[frame]._offset1, Common::Point(), flags);
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if (_index[frame]._offset2)
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drawOffset(tempSurface, _index[frame]._offset2, Common::Point(), flags);
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// TODO: I don't currently know the algorithm the original used for scaling.
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// This is a best fit estimate that every increment of the scale field
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// reduces the size of a sprite by approximately 6.6%
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int newScale = MAX(100.0 - 6.6 * scale, 0.0);
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if (newScale > 0)
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tempSurface.transBlitTo(dest, Common::Point(), newScale, 0);
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}
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}
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/**
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* Draw the sprite onto the given surface
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*/
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void SpriteResource::draw(XSurface &dest, int frame) const {
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draw(dest, frame, Common::Point());
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}
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} // End of namespace Xeen
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