void HiRes5Engine::loadSong(Common::ReadStream &stream) {
while (true) {
const byte period = stream.readByte();
if (stream.err() || stream.eos())
error("Error loading song");
if (period == 0xff)
return;
byte length = stream.readByte();
if (stream.err() || stream.eos())
error("Error loading song");
const uint kLoopCycles = 20; // Delay loop cycles
double freq = 0.0;
// This computation ignores CPU cycles spent on overflow handling and
// speaker control. As a result, our tone frequencies will be slightly
// higher than those on original hardware.
if (period != 0)
freq = kClock / 2.0 / (period * kLoopCycles);
const double len = (length > 0 ? length - 1 : 255) * 256 * kLoopCycles * 1000 / (double)kClock;
_song.push_back(Tone(freq, len));
}
}
/**
* Load a NULL-terminated string from the given stream.
*/
static Common::String loadString(Common::ReadStream &in, uint maxSize = 999) {
Common::String result;
while (!in.eos() && (result.size() < maxSize)) {
char ch = (char)in.readByte();
if (ch == '\0')
break;
result += ch;
}
return result;
}
DataBlockPtr AdlEngine_v2::readDataBlockPtr(Common::ReadStream &f) const {
byte track = f.readByte();
byte sector = f.readByte();
byte offset = f.readByte();
byte size = f.readByte();
if (f.eos() || f.err())
error("Error reading DataBlockPtr");
if (track == 0 && sector == 0 && offset == 0 && size == 0)
return DataBlockPtr();
return _disk->getDataBlock(track, sector, offset, size);
}
Common::String XARCMember::readString(Common::ReadStream &stream) {
Common::String str;
// Read until we find a 0
char c = 1;
while (c != 0) {
c = stream.readByte();
if (stream.eos()) {
c = 0;
} else {
str += c;
}
}
return str;
}
void Display::loadFrameBuffer(Common::ReadStream &stream) {
byte *dst = _frameBuf;
for (uint j = 0; j < 8; ++j) {
for (uint i = 0; i < 8; ++i) {
stream.read(dst, DISPLAY_PITCH);
dst += DISPLAY_PITCH * 64;
stream.read(dst, DISPLAY_PITCH);
dst += DISPLAY_PITCH * 64;
stream.read(dst, DISPLAY_PITCH);
stream.readUint32LE();
stream.readUint32LE();
dst -= DISPLAY_PITCH * 120;
}
dst -= DISPLAY_PITCH * 63;
}
if (stream.eos() || stream.err())
error("Failed to read frame buffer");
}
void Graphics_v1::drawCorners(Common::ReadStream &corners, const Common::Point &pos, byte rotation, byte scaling, byte color) const {
const byte stepping[] = {
0xff, 0xfe, 0xfa, 0xf4, 0xec, 0xe1, 0xd4, 0xc5,
0xb4, 0xa1, 0x8d, 0x78, 0x61, 0x49, 0x31, 0x18,
0xff
};
byte quadrant = rotation >> 4;
rotation &= 0xf;
byte xStep = stepping[rotation];
byte yStep = stepping[(rotation ^ 0xf) + 1] + 1;
Common::Point p(pos);
while (true) {
byte b = corners.readByte();
if (corners.eos() || corners.err())
error("Error reading corners");
if (b == 0)
return;
do {
byte xFrac = 0x80;
byte yFrac = 0x80;
for (uint j = 0; j < scaling; ++j) {
if (xFrac + xStep + 1 > 255)
drawCornerPixel(p, color, b, quadrant);
xFrac += xStep + 1;
if (yFrac + yStep > 255)
drawCornerPixel(p, color, b, quadrant + 1);
yFrac += yStep;
}
b >>= 3;
} while (b != 0);
}
}