Audio::Timestamp VideoDecoder::FixedRateVideoTrack::getFrameTime(uint frame) const {
// Try to get as accurate as possible, considering we have a fractional frame rate
// (which Audio::Timestamp doesn't support).
Common::Rational frameRate = getFrameRate();
// Try to keep it in terms of the frame rate, if the frame rate is a whole
// number.
if (frameRate.getDenominator() == 1)
return Audio::Timestamp(0, frame, frameRate.toInt());
// Convert as best as possible
Common::Rational time = frameRate.getInverse() * frame;
return Audio::Timestamp(0, time.getNumerator(), time.getDenominator());
}
void Surface::blitScaled(const Surface &from, int16 left, int16 top, int16 right, int16 bottom,
int16 x, int16 y, Common::Rational scale, int32 transp) {
if (scale == 1) {
// Yeah, "scaled"
blit(from, left, top, right, bottom, x, y, transp);
return;
}
// Color depths have to fit
assert(_bpp == from._bpp);
uint16 dWidth = (uint16) floor((_width / scale).toDouble());
uint16 dHeight = (uint16) floor((_height / scale).toDouble());
int16 clipX = ( int16) floor((x / scale).toDouble());
int16 clipY = ( int16) floor((y / scale).toDouble());
// Clip
if (!clipBlitRect(left, top, right, bottom, clipX, clipY, dWidth, dHeight, from._width, from._height))
return;
// Area to actually copy
uint16 width = right - left + 1;
uint16 height = bottom - top + 1;
if ((width == 0) || (height == 0))
// Nothing to do
return;
width = MIN<int32>((int32) floor((width * scale).toDouble()), _width);
height = MIN<int32>((int32) floor((height * scale).toDouble()), _height);
// Pointers to the blit destination and source start points
byte *dst = getData(x , y);
const byte *src = from.getData(left, top);
frac_t step = scale.getInverse().toFrac();
frac_t posW = 0, posH = 0;
while (height-- > 0) {
byte *dstRow = dst;
const byte *srcRow = src;
posW = 0;
for (uint16 i = 0; i < width; i++, dstRow += _bpp) {
memmove(dstRow, srcRow, _bpp);
posW += step;
while (posW >= ((frac_t) FRAC_ONE)) {
srcRow += from._bpp;
posW -= FRAC_ONE;
}
}
posH += step;
while (posH >= ((frac_t) FRAC_ONE)) {
src += from._width * from._bpp;
posH -= FRAC_ONE;
}
dst += _width * _bpp;
}
}