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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/scummsys.h"
#include "common/archive.h"
#include "common/memstream.h"
#include "common/textconsole.h"
#include "xeen/xeen.h"
#include "xeen/sprites.h"
namespace Xeen {
SpriteResource::SpriteResource() {
_filesize = 0;
_data = nullptr;
}
SpriteResource::SpriteResource(const Common::String &filename) {
_data = nullptr;
load(filename);
}
SpriteResource::~SpriteResource() {
clear();
}
void SpriteResource::load(const Common::String &filename) {
// Open the resource
File f(filename);
// Read in a copy of the file
_filesize = f.size();
delete[] _data;
_data = new byte[_filesize];
f.read(_data, _filesize);
// Read in the index
f.seek(0);
int count = f.readUint16LE();
_index.resize(count);
for (int i = 0; i < count; ++i) {
_index[i]._offset1 = f.readUint16LE();
_index[i]._offset2 = f.readUint16LE();
}
}
void SpriteResource::clear() {
delete[] _data;
_data = nullptr;
_filesize = 0;
}
void SpriteResource::drawOffset(XSurface &dest, uint16 offset, const Common::Point &destPos) const {
// Get cell header
Common::MemoryReadStream f(_data, _filesize);
f.seek(offset);
int xOffset = f.readUint16LE();
int width = f.readUint16LE();
int yOffset = f.readUint16LE();
int height = f.readUint16LE();
if (dest.w < (xOffset + width) || dest.h < (yOffset + height))
dest.create(xOffset + width, yOffset + height);
// The pattern steps used in the pattern command
const int patternSteps[] = { 0, 1, 1, 1, 2, 2, 3, 3, 0, -1, -1, -1, -2, -2, -3, -3 };
// Main loop
int opr1, opr2;
int32 pos;
for (int yPos = yOffset, byteCount = 0; yPos < height + yOffset; yPos++, byteCount = 0) {
// The number of bytes in this scan line
int lineLength = f.readByte();
if (lineLength == 0) {
// Skip the specified number of scan lines
yPos += f.readByte();
} else {
// Skip the transparent pixels at the beginning of the scan line
int xPos = f.readByte() + xOffset; ++byteCount;
byte *destP = (byte *)dest.getBasePtr(destPos.x + xPos, destPos.y + yPos);
while (byteCount < lineLength) {
// The next byte is an opcode that determines what
// operators are to follow and how to interpret them.
int opcode = f.readByte(); ++byteCount;
// Decode the opcode
int len = opcode & 0x1F;
int cmd = (opcode & 0xE0) >> 5;
switch (cmd) {
case 0: // The following len + 1 bytes are stored as indexes into the color table.
case 1: // The following len + 33 bytes are stored as indexes into the color table.
for (int i = 0; i < opcode + 1; ++i, ++xPos) {
*destP++ = f.readByte(); ++byteCount;
}
break;
case 2: // The following byte is an index into the color table, draw it len + 3 times.
opr1 = f.readByte(); ++byteCount;
for (int i = 0; i < len + 3; ++i, ++xPos)
*destP++ = opr1;
break;
case 3: // Stream copy command.
opr1 = f.readUint16LE(); byteCount += 2;
pos = f.pos();
f.seek(-opr1, SEEK_CUR);
for (int i = 0; i < len + 4; ++i, ++xPos)
*destP++ = f.readByte();
f.seek(pos, SEEK_SET);
break;
case 4: // The following two bytes are indexes into the color table, draw the pair len + 2 times.
opr1 = f.readByte(); ++byteCount;
opr2 = f.readByte(); ++byteCount;
for (int i = 0; i < len + 2; ++i, xPos += 2) {
*destP++ = opr1;
*destP++ = opr2;
}
break;
case 5: // Skip len + 1 pixels filling them with the transparent color.
xPos += len + 1;
destP += len + 1;
break;
case 6: // Pattern command.
case 7:
// The pattern command has a different opcode format
len = opcode & 0x07;
cmd = (opcode >> 2) & 0x0E;
opr1 = f.readByte(); ++byteCount;
for (int i = 0; i < len + 3; ++i, ++xPos) {
*destP++ = opr1;
opr1 += patternSteps[cmd + (i % 2)];
}
break;
default:
break;
}
}
assert(byteCount == lineLength);
}
}
dest.addDirtyRect(Common::Rect(destPos.x + xOffset, destPos.y + yOffset,
destPos.x + xOffset + width, destPos.y + yOffset + height));
}
void SpriteResource::draw(XSurface &dest, int frame, const Common::Point &destPos) const {
drawOffset(dest, _index[frame]._offset1, destPos);
if (_index[frame]._offset2)
drawOffset(dest, _index[frame]._offset2, destPos);
}
void SpriteResource::draw(XSurface &dest, int frame) const {
draw(dest, frame, Common::Point());
}
} // End of namespace Xeen
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