static WebTransformationMatrix windowMatrix(int x, int y, int width, int height)
{
WebTransformationMatrix canvas;
// Map to window position and scale up to pixel coordinates.
canvas.translate3d(x, y, 0);
canvas.scale3d(width, height, 0);
// Map from ([-1, -1] to [1, 1]) -> ([0, 0] to [1, 1])
canvas.translate3d(0.5, 0.5, 0.5);
canvas.scale3d(0.5, 0.5, 0.5);
return canvas;
}
static WebTransformationMatrix blendTransformOperations(const WebTransformOperation* from, const WebTransformOperation* to, double progress)
{
WebTransformationMatrix toReturn;
if (isIdentity(from) && isIdentity(to))
return toReturn;
WebTransformOperation::Type interpolationType = WebTransformOperation::WebTransformOperationIdentity;
if (isIdentity(to))
interpolationType = from->type;
else
interpolationType = to->type;
switch (interpolationType) {
case WebTransformOperation::WebTransformOperationTranslate: {
double fromX = isIdentity(from) ? 0 : from->translate.x;
double fromY = isIdentity(from) ? 0 : from->translate.y;
double fromZ = isIdentity(from) ? 0 : from->translate.z;
double toX = isIdentity(to) ? 0 : to->translate.x;
double toY = isIdentity(to) ? 0 : to->translate.y;
double toZ = isIdentity(to) ? 0 : to->translate.z;
toReturn.translate3d(blendDoubles(fromX, toX, progress),
blendDoubles(fromY, toY, progress),
blendDoubles(fromZ, toZ, progress));
break;
}
case WebTransformOperation::WebTransformOperationRotate: {
double axisX = 0;
double axisY = 0;
double axisZ = 1;
double fromAngle = 0;
double toAngle = isIdentity(to) ? 0 : to->rotate.angle;
if (shareSameAxis(from, to, axisX, axisY, axisZ, fromAngle))
toReturn.rotate3d(axisX, axisY, axisZ, blendDoubles(fromAngle, toAngle, progress));
else {
WebTransformationMatrix toMatrix;
if (!isIdentity(to))
toMatrix = to->matrix;
WebTransformationMatrix fromMatrix;
if (!isIdentity(from))
fromMatrix = from->matrix;
toReturn = toMatrix;
toReturn.blend(fromMatrix, progress);
}
break;
}
case WebTransformOperation::WebTransformOperationScale: {
double fromX = isIdentity(from) ? 1 : from->scale.x;
double fromY = isIdentity(from) ? 1 : from->scale.y;
double fromZ = isIdentity(from) ? 1 : from->scale.z;
double toX = isIdentity(to) ? 1 : to->scale.x;
double toY = isIdentity(to) ? 1 : to->scale.y;
double toZ = isIdentity(to) ? 1 : to->scale.z;
toReturn.scale3d(blendDoubles(fromX, toX, progress),
blendDoubles(fromY, toY, progress),
blendDoubles(fromZ, toZ, progress));
break;
}
case WebTransformOperation::WebTransformOperationSkew: {
double fromX = isIdentity(from) ? 0 : from->skew.x;
double fromY = isIdentity(from) ? 0 : from->skew.y;
double toX = isIdentity(to) ? 0 : to->skew.x;
double toY = isIdentity(to) ? 0 : to->skew.y;
toReturn.skewX(blendDoubles(fromX, toX, progress));
toReturn.skewY(blendDoubles(fromY, toY, progress));
break;
}
case WebTransformOperation::WebTransformOperationPerspective: {
double fromPerspectiveDepth = isIdentity(from) ? numeric_limits<double>::max() : from->perspectiveDepth;
double toPerspectiveDepth = isIdentity(to) ? numeric_limits<double>::max() : to->perspectiveDepth;
toReturn.applyPerspective(blendDoubles(fromPerspectiveDepth, toPerspectiveDepth, progress));
break;
}
case WebTransformOperation::WebTransformOperationMatrix: {
WebTransformationMatrix toMatrix;
if (!isIdentity(to))
toMatrix = to->matrix;
WebTransformationMatrix fromMatrix;
if (!isIdentity(from))
fromMatrix = from->matrix;
toReturn = toMatrix;
toReturn.blend(fromMatrix, progress);
break;
}
case WebTransformOperation::WebTransformOperationIdentity:
// Do nothing.
break;
}
return toReturn;
}